Photoflash device

Claim 2

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying, prior to flash of the flash device, a maximum distance value representative of the maximum distance from the subject at which a subsequent flash will properly expose the film of an associated camera, comprising: memory means having a plurality of memory address locations, each of which storing distance display signals representative of a maximum distance value, said memory means being responsive to memory address signals for outputting distance display signals; ASA input means manually actuable by the photographer for inputting ASA data representative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initiated ASA film speed value; f-number means manually actuable by the photographer for inputting f-number date representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; arithmetic means for receiving inputs of said first and said second binary signals, and generating memory address signals for addressing a memory address location in said memory means for commanding output of distance display signals from said memory means, said address location being dependent on the relative change of both the represented ASA and f-number from their respective said initialized values; and display means responsive to said distance display signals output from said memory means for displaying a maximum distance value representative of the maximum distance at which a subsequent flash will properly expose film of an ASA speed inputted by said ASA input means, of an associated camera set at an f-number inputted by said f-number input means.

Claim 3

A display apparatus according to claim 1 wherein said processing means generates said memory address signals according to the relative difference in binary magnitude of said first and said second binary signals.

Claim 4

A display apparatus according to claim 2 wherein said arithmetic processing means receives inputs of said first and said second binary signals for generating said memory address signals according to the result of the binary subtraction of the binary number represented by said first binary signals.

Claim 5

A display apparatus according to claim 1 wherein said ASA input means includes means manually actuable by the photographer for generating third binary signals representative of one of a plurality of ASA film speeds; logic means for converting said third binary signals to said first binary signals; and wherein said memory means is responsive to said third binary signals for addressing ASA display signals; and wherein said display means is responsive to said ASA display signals for displaying ASA information.

Claim 6

A display apparatus according to claim 1 wherein said ASA input means includes means manually actuable by the photographer for commanding generation of successive signal pulses and wherein said arithmetic processing means includes counter means responsive to each of said signal pulses for counting according thereto.

Claim 7

A display apparatus according to claim 1 and further including flash termination means for controlling the duration of the flash of the flash device; and wherein said arithmetic processing means outputs third binary signals to said flash termination means for establishing said duration.

Claim 8

A display apparatus according to claim 6 wherein said flash termination means includes: light sensor means for monitoring light received back from the subject being photographed; light digitizing means coupled to said light sensor means for producing successive pulse outputs, each pulse output representative of a discrete quantity of light monitored by said light sensor means; counter means connected to received said pulse outputs of said light digitizing means, for producing a count output in accordance with the number of said pulse outputs received; and logic means responsive to said third binary signals from said arithmetic processing means and responsive to said count output from said counter means, for terminating the flash of the flash device.

Claim 9

A display apparatus according to claim 7 wherein said logic means monitors a sole bit in said count output of said counter means for terminating the flash, said sole bit determined by said third binary signals from said arithmetic processing means.

Claim 10

A display apparatus according to claim 1 wherein said memory means includes; a memory device having an address input and for outputting distance display signals; and addressing means responsive to said memory address signals for providing an input to said address input for outputting distance display signals.

Claim 11

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising: ASA input means mutually actuable by the photographer for inputting ASA data representative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; value input means manually operable by the photographer for selecting exposure modification data, said value input means for inputting data representative of one of a plurality of values of a photographic variable indicative of exposure modification, each of the values representable being a power of two multiple of a value of the photographic variable, said value input means commanding generation of third binary signals representative of the power of two change of the represented value input from an initialized value of the photographic variable; arithmetic processing means for receiving inputs of said first, said second and said third binary signals and generating fourth binary signals representative of a binary number having a magnitude dependent on the relative change of the represented ASA, f-number and the said photographic variable from their respective said initialized values; generation means responsive to said fourth binary signals for generating distance display signals; and display means responsive to said distance display signals from said generation means for displaying visual distance information, whereby distance value may be displayed representative of a distance at which a picture taken with the photoflash system will be underexposed or overexposed.

Claim 12

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising: ASA input means mutually actuable by the photographer for inputting ASA data representative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; value input means manually operable by the photographer for selecting exposure modification data, said value input means for inputting data representative of one of a plurality of values of a photographic variable indicative of exposure modification, each of the values representable being a power of two multiple of a value of the photographic variable, said value input means commanding generation of third binary signals representative of the power of two change of the represented value input from an initialized value of the photographic variable; arithmetic processing means for receiving inputs of said first, said second and said third binary signals and generating fourth binary signals representative of a binary number having a magnitude dependent on the relative change of the represented ASA, f-number and the said photographic variable from their respective said initialized values; generation means responsive to said fourth binary signals for generating distance display signals; and display means responsive to said distance display signals from said generation means for displaying visual distance information, whereby distance value may be displayed representative of a distance at which a picture taken with the photoflash system will be underexposed or overexposed.

Claim 13

A display device according to claim 10 and further including flash termination means for controlling the duration of the flash of the flash device; and wherein said arithmetic processing means outputs fifth binary signals to said flash termination means for establishing said duration, said fifth binary signals dependent on the binary value of said fourth binary signals.

Claim 14

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying, prior to flash of the flash device, a maximum distance value representative of the maximum distance from the subject at which a subsequent flash will properly expose the film of an associated camera, comprising: ASA input means manually actuable by the photographer for inputting ASA data representative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; value input means for inputting data representative of one of a plurality of values of a photographic variable, each of the values representable being a power of two multiple of a value of the photographic variable, said value input means commanding generation of third binary signals representative of the power of two change of the represented value input from an initialized value of the photographic variable; arithmetic processing means for receiving inputs of said first, said second and said third binary signals, and generating fourth binary signals representative of a binary number having a magnitude dependent on the relative change of the represented ASA, f-number and the said photographic variable from their respective said initialized values; generation means responsive to said fourth binary signals for generating distance display signals; and display means responsive to said distance display signals from said generation means for displaying a maximum distance value representative of the maximum distance at which a subsequent flash will properly expose film of an ASA speed inputted by said ASA means, of an associated camera.

Claim 15

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying, prior to flash of the flash device, a maximum distance value representative of the maximum distance from the subject at which a subsequent flash will properly expose the film of an associated camera, comprising: ASA input means manually actuable by the photographer for inputting ASA data representative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; value input means for inputting data representative of one of a plurality of values of a photographic variable, each of the values representable being a power of two multiple of a value of the photographic variable, said value input means commanding generation of third binary signals representative of the power of two change of the represented value input from an initialized value of the photographic variable; arithmetic processing means for receiving inputs of said first, said second and said third binary signals, and generating fourth binary signals representative of a binary number having a magnitude dependent on the relative change of the represented ASA, f-number and the said photographic variable from their respective said initialized values; generation means responsive to said fourth binary signals for generating distance display signals; and display means responsive to said distance display signals from said generation means for displaying a maximum distance value representative of the maximum distance at which a subsequent flash will properly expose film of an ASA speed inputted by said ASA means, of an associated camera.

Claim 16

A display apparatus according to claim 12 wherein said photographic variable in BCPS.

Claim 17

A display apparatus according to claim 13 wherein said photographic variable is indicative of the light pattern being generated.

Claim 18

A display apparatus according to claim 14 and further including lens means for generating said light pattern.

Claim 19

A display apparatus according to claim 15 wherein said lens means includes a plurality of lens arrangements selectable by the photographer.

Claim 20

A display apparatus according to claim 16 wherein said value input means automatically inputs said data in response to the lens arrangement selected by the photographer.

Claim 21

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a control/calculator apparatus for visually displaying distance information to the photographer, comprising: ASA input means manually actuable by the photographer for generating first binary signals representative of one of a plurality of ASA film speeds, only some of said speeds being a power of two multiple of an ASA film speed; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number from an initialized f-number value; processing means for receiving said first and said second binary signals and for converting said first binary signals to third binary signals representative of a film speed being a power of two multiple of an ASA film speed, said third binary signals representative of the power of two change in ASA of the represented ASA film speed from an initialized ASA value, said processing means responsive to said second and third binary signals for generating fourth binary signals for controlling termination of the flash of the device; memory means responsive to said first signals for generating ASA display signals; and display means responsive to said ASA display signals for displaying its represented ASA film speed.

Claim 22

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a control/calculator apparatus for visually displaying distance information to the photographer, comprising: ASA input means manually actuable by the photographer for generating first binary signals representative of one of a plurality of ASA film speeds, only some of said speeds being a power of two multiple of an ASA film speed; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number from an initialized f-number value; processing means for receiving said first and said second binary signals and for converting said first binary signals to third binary signals representative of a film speed being a power of two multiple of an ASA film speed, said third binary signals representative of the power of two change in ASA of the represented ASA film speed from an initialized ASA value, said processing means responsive to said second and third binary signals for generating fourth binary signals for controlling termination of the flash of the device; memory means responsive to said first signals for generating ASA display signals; and display means responsive to said ASA display signals for displaying its represented ASA film speed.

Claim 23

A control/calculator apparatus according to claim 18 wherein said processing means generates fifth binary signals representative of a binary number having a magnitude dependent on the relative change of both the ASA speed represented by said third binary signals and the f-number represented by said second binary signals from their respective said initialized values; and wherein said memory means is responsive to said fifth binary signals for generating distance display signals; and wherein said distance display means is responsive to said distance display signals for displaying distance information.

Claim 24

A control/calculator apparatus according to claim 19 wherein said processing means generates fifth binary signals representative of the relative difference in binary magnitude of said second and said third binary signals.

Claim 25

A control/calculator apparatus according to claim 20 wherein said processing means generates fifth binary signals representative of the result of the binary subtraction of the binary number represented by said second binary signals from the binary number represented by said third binary signals.

Claim 26

A calculator/control apparatus according to claim 18 wherein said ASA input means includes means manually actuable by the photographer for commanding generation of successive signals pulses; and wherein said processing means includes counter means responsive to each of said signal pulses for counting according thereto.

Claim 27

A calculator/control apparatus according to claim 18 and further including flash termination means for controlling the duration of the flash of the flash device, said flash termination means responsive to said fourth binary signals for establishing said duration.

Claim 28

A display apparatus according to claim 23 wherein said flash termination means includes: light sensor means for monitoring light received back from the subject being photographed; light digitizing means coupled to said light sensor means for producing successive pulse outputs, each pulse output representative of a discrete quantity of light monitored by said light sensor means; counter means connected to received said pulse outputs of said light digitizing means, for producing a count output in accordance with the number of said pulse outputs received; and logic means responsive to said fourth binary signals from said processing means and responsive to said count output from said counter means, for terminating the flash of the flash device.

Claim 29

A display apparatus according to claim 24 wherein said logic means monitors a sole bit in said count output of said counter means for terminating the flash, said sole bit determined by said fourth binary signals from said processing means.

Claim 30

A display apparatus according to claim 18 wherein said memory means includes; a memory device having an address input and for outputting ASA display signals; and addressing means responsive to said first binary signals for providing an input to said address input for outputting ASA display signals.

Claim 31

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a calculator/control apparatus for visually displaying distance information to the photographer, comprising: first input means manually actuable by the photographer for commanding generation of first binary signals representative of a quantity of light to be received back from the photographed scene to initiate flash termination; second input means manually actuable by the photographer for commanding generation of second binary signals representative of a value of a first photographic variable; processing means for receiving inputs of said first and said second binary signals, and generating third binary signals representative of a second photographic variable and for generating fourth binary signals from said first and second binary signals representative of a distance value; and visual display means controlled by said processing means for displaying a value of said first photographic variable, a value of said second photographic variable and distance information.

Claim 32

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a calculator/control apparatus for visually displaying distance information to the photographer, comprising: first input means manually actuable by the photographer for commanding generation of first binary signals representative of a quantity of light to be received back from the photographed scene to initiate flash termination; second input means manually actuable by the photographer for commanding generation of second binary signals representative of a value of a first photographic variable; processing means for receiving inputs of said first and said second binary signals, and generating third binary signals representative of a second photographic variable and for generating fourth binary signals from said first and second binary signals representative of a distance value; and visual display means controlled by said processing means for displaying a value of said first photographic variable, a value of said second photographic variable and distance information.

Claim 33

A calculator/control apparatus according to claim 27 and further including flash termination means for controlling the duration of the flash of the flash device dependent on the magnitude of the binary number represented by said first binary signals.

Claim 34

A calculator/control apparatus according to claim 28 wherein sid first photographic variable is ASA film speed; and wherein said second photographic variable is lens f-number.

Claim 35

A calculator/control apparatus according to claim 29 wherein each of the film speeds represented by said second binary signals are a power of two multiple of an ASA film speed; and wherein said second binary signals represent the power of two change in ASA of the represented ASA input from an initialized ASA value.

Claim 36

A calculator/control apparatus according to claim 27 wherein said visual display means includes: logic memory means responsive to said second, said third and said fourth binary signals for generating display signals; an addressing means for addressing display signals from said memory means at an address location represented by said second, third and fourth binary signals; and a display device responsive to said display signals from said logic memory means for displaying said values of said first and second photographic variables and said distance information.

Claim 37

A calculator/control apparatus according to claim 27 and further including logic means for establishing the maximum and the minimum quantity of light representable by said first binary signals in accordance the value representated by said second binary signals.

Claim 38

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photographic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable. third input means manually actuable by the photographer for generating a manual mode data signal; processor means responsive to said first binary signals, said second binary signals and said manual mode data signals for generating third binary signals representative of a first distance value and for generating fourth binary signals representative of a second distance value; visual display means responsive to said third and said fourth binary signals for displaying both said first and said second distance values.

Claim 39

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photographic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable. third input means manually actuable by the photographer for generating a manual mode data signal; processor means responsive to said first binary signals, said second binary signals and said manual mode data signals for generating third binary signals representative of a first distance value and for generating fourth binary signals representative of a second distance value; visual display means responsive to said third and said fourth binary signals for displaying both said first and said second distance values.

Claim 40

A display apparatus according to claim 33 wherein said visual display means alternatively displays said first and said second distance values.

Claim 41

Apparatus according to claim 33 and further including flash termination means for automatically controlling the duration of the flash of the flash device in accordance with monitored light, said flash termination means inhibited from operating by said manual mode data signal.

Claim 42

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a calculator/control apparatus for modifying the exposure of the film of an associated camera, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photographic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable; third input means manually actuable by the photographer for generating an exposure modification signal; light sensing means arranged for monitoring light coming from the photographic scene and for generating third binary signals representative of a total quantity of light monitored; processor means for receiving said first, said second and said third binary signals and said exposure modification signal, said processor means monitoring a sole bit of the binary number represented by said third binary signals for terminating the flash of the device, said exposure modification signal shifting said sole bit monitored by said processor means by 1-bit position for modifying the exposure of the film.

Claim 43

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a calculator/control apparatus for modifying the exposure of the film of an associated camera, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photographic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable; third input means manually actuable by the photographer for generating an exposure modification signal; light sensing means arranged for monitoring light coming from the photographic scene and for generating third binary signals representative of a total quantity of light monitored; processor means for receiving said first, said second and said third binary signals and said exposure modification signal, said processor means monitoring a sole bit of the binary number represented by said third binary signals for terminating the flash of the device, said exposure modification signal shifting said sole bit monitored by said processor means by 1-bit position for modifying the exposure of the film.

Claim 44

A calculator/control apparatus according to claim 36 and further including reset means for resetting said third input means.

Claim 45

A calculator/control apparatus according to claim 37 and further including: fourth input means manually actuable by the photographer for generating a manual mode data signals; and means responsive to the generation of said manual mode signal for commanding said reset means to maintain said third input means reset.

Claim 46

A calculator/control apparatus according to claim 37 and further including means responsive to the photographer flashing the flash device for commanding said reset means to reset said third input means.

Claim 47

Apparatus according to claim 36 and further including visual display means for displaying an f-number value, an ASA film speed value and distance information; and wherein said processor means controls the values displayed by said display means, and said processor means solely changes the distance information displayed in response to said exposure modification signal.

Claim 48

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed and means for arranging the flash device in a bounce mode, a display apparatus for visually displaying distance information to the photographer, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photographic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable; processor means responsive to said first binary signals and said second binary signals for generating third binary signals representative of a distance value dependent on said first and said second photographic variables; visual display means response to said third binary signals for displaying said distance value; blanking means coupled to said visual display means, for selectively blanking the display of said distance value; and lens monitoring means responsive to the flash device being arranged in a bounce mode for commanding said blanking means to selectively blank said display of said distance value.

Claim 49

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed and means for arranging the flash device in a bounce mode, a display apparatus for visually displaying distance information to the photographer, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photographic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable; processor means responsive to said first binary signals and said second binary signals for generating third binary signals representative of a distance value dependent on said first and said second photographic variables; visual display means response to said third binary signals for displaying said distance value; blanking means coupled to said visual display means, for selectively blanking the display of said distance value; and lens monitoring means responsive to the flash device being arranged in a bounce mode for commanding said blanking means to selectively blank said display of said distance value.

Claim 50

A display apparatus according to claim 36 wherein said display means displays said value of said first photographic variable and said value of said second photograhic variable; and said lens monitoring means commands said blanking means to solely blank said display of said distance value.

Claim 51

In a photoflash system having a flash device and means for firing the latter in an automatic mode or in a manual mode to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising: ASA input means manually actuable by the photographer for inputting ASA data respresentative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; automatic/manual input means manually actuable by the photographer for inputting mode data for instructing a manual or an automatic mode of operation of the flash of the flash device; arithmetic processing means for receiving inputs of said first and said second binary signals, and generating third binary signals representative of a binary number having a magnitude dependent on the relative change of both the represented ASA and f-number from their respective said initialized values and dependent on said mode data; generation means responsive to said third binary signals for generating distance display signals for display of a single distance when in the automatic mode and for display of a range of distances when in the manual mode; and display means responsive to said distance display signals from said generation means for visually displaying distance information.

Claim 52

In a photoflash system having a flash device and means for firing the latter in an automatic mode or in a manual mode to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising: ASA input means manually actuable by the photographer for inputting ASA data respresentative of one of a plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; automatic/manual input means manually actuable by the photographer for inputting mode data for instructing a manual or an automatic mode of operation of the flash of the flash device; arithmetic processing means for receiving inputs of said first and said second binary signals, and generating third binary signals representative of a binary number having a magnitude dependent on the relative change of both the represented ASA and f-number from their respective said initialized values and dependent on said mode data; generation means responsive to said third binary signals for generating distance display signals for display of a single distance when in the automatic mode and for display of a range of distances when in the manual mode; and display means responsive to said distance display signals from said generation means for visually displaying distance information.

Claim 53

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a calculator/control apparatus for visually indicating acceptable exposure occurence to the photographer, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photograhic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable; light sensing means arrange for monitoring light coming from the photographic scene and for generating third binary signals represenative of a total quantity of light monitored; processor means for receiving said first binary signals and said second binary signals and for generating fourth binary signals representative of a quantity of light to be received from the photographic scene; said processor means for monitoring a sole bit of the binary number represented by said third binary signals for terminating the flash of the flash device responsive to said third binary signals representing a total quantity of light equal to the quantity of light represented by said fourth binary signals and for monitoring the immediate two least significant bits adjacent said sole bit in said binary number represented by said third binary signals for generating an annunciator signal responsive to said third binary signals representing a total quantity of light substantially one-half an EV less than the quantity of light represented by said fourth binary signals; and annunciator means responsive to said annunciator signal for signaling the photographer of an acceptable exposure occurence.

Claim 54

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a calculator/control apparatus for visually indicating acceptable exposure occurence to the photographer, comprising: first input means manually actuable by the photographer for generating first binary signals representative of a value of a first photograhic variable; second input means manually actuable by the photographer for generating second binary signals representative of a value of a second photographic variable; light sensing means arrange for monitoring light coming from the photographic scene and for generating third binary signals represenative of a total quantity of light monitored; processor means for receiving said first binary signals and said second binary signals and for generating fourth binary signals representative of a quantity of light to be received from the photographic scene; said processor means for monitoring a sole bit of the binary number represented by said third binary signals for terminating the flash of the flash device responsive to said third binary signals representing a total quantity of light equal to the quantity of light represented by said fourth binary signals and for monitoring the immediate two least significant bits adjacent said sole bit in said binary number represented by said third binary signals for generating an annunciator signal responsive to said third binary signals representing a total quantity of light substantially one-half an EV less than the quantity of light represented by said fourth binary signals; and annunciator means responsive to said annunciator signal for signaling the photographer of an acceptable exposure occurence.

Claim 55

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising; ASA input means manually actuable by the photographer for inputting ASA data representative of one of the plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; value input means for inputting data representative of one of a plurality of values of a photographic variable indicative of exposure modification, each of the values representable being a power of two multiple of a value of the photographic variable, said value input means commanding generation of third binary signals representative of the power of two change of the represented value input from an initialized value of the photographic variable; arithmetic processing means for receiving inputs of said first, said second and said third binary signals, and generating fourth binary signals representative of a binary number having a magnitude dependent on the relative change of the represented ASA, f-number and the said photographic variable from their respective said initialized values; generation means responsive to said fourth binary signals for generating distance display signals; and display means responsive to said distance display signals from said genertion means for displaying visual distance information, whereby a distance value may be displayed representative of a distance at which a picture taken with the photoflash system will be underexposed or overexposed.

Claim 56

In a photoflash system having a flash device and means for firing the latter to produce light on a subject to be photographed, a display apparatus for visually displaying distance information to the photographer, comprising; ASA input means manually actuable by the photographer for inputting ASA data representative of one of the plurality of ASA film speeds, each of the film speeds representable being a power of two multiple of an ASA film speed, said ASA input means commanding generation of first binary signals representative of the power of two change in ASA of the represented ASA input from an initialized ASA film speed value; f-number input means manually actuable by the photographer for inputting f-number data representative of a camera f-number, said f-number input means commanding generation of second binary signals representative of a change in f-stop positions of the represented f-number input from an initialized f-number value; value input means for inputting data representative of one of a plurality of values of a photographic variable indicative of exposure modification, each of the values representable being a power of two multiple of a value of the photographic variable, said value input means commanding generation of third binary signals representative of the power of two change of the represented value input from an initialized value of the photographic variable; arithmetic processing means for receiving inputs of said first, said second and said third binary signals, and generating fourth binary signals representative of a binary number having a magnitude dependent on the relative change of the represented ASA, f-number and the said photographic variable from their respective said initialized values; generation means responsive to said fourth binary signals for generating distance display signals; and display means responsive to said distance display signals from said genertion means for displaying visual distance information, whereby a distance value may be displayed representative of a distance at which a picture taken with the photoflash system will be underexposed or overexposed.