Exposure setting device for flash photographing

Claim 2

An exposure control for a photographic system having a shutter and a diaphragm as well as a focus control and a flash, comprising light sensitive means for producing a signal corresponding to the light on an object to be photographed, focus control signal means for producing a signal corresponding to the setting of the focus control, diaphragm signal means for producing a signal corresponding to the diaphragm opening, a shutter regulating circuit for regulating the shutter speed, indicating means, flash power signal means for producing a signal corresponding to the power of the flash, and control means selectively operable in an available light mode and in a flash mode and coupled to said diaphragm signal means and said light sensitive means as well as said flash power signal means and said indicating means as well as said focus control signal means and said shutter regulating circuit for constraining said shutter regulating circuit to cause the shutter to operate at a speed in response to the light sensitive means and said diaphragm signal means in the available-light mode, and for constraining said shutter regulating circuit to operate the shutter at a predetermined speed period while causing said indicating means to produce an indication corresponding to the flash power signal means and the focusing arrangement in the flash mode so that the diaphragm can be operated on the basis of the indicating means.

Claim 3

A device as in claim 1, wherein said indicating means includes means for setting the diaphragm to the desired opening determined by said indicating means.

Claim 4

An exposure setting device for a photographic system with a shutter and a diaphragm as well as a focus arrangement and a flash device, comprising a light receiving element for receiving light from an object and producing a signal corresponding to the light received, variable resistance means coupled to the focusing arrangement for producing a signal corresponding to the distance to an object being photographed, setting means coupled to the diaphragm for producing a signal corresponding to the diaphragm setting, detecting means for producing a signal corresponding to the power of the flash device, first operating circuit means responsive to said detecting means and the variable resistance means, second operating circuit means coupled to said setting means and alternately connectable with said light receiving element and said first operating circuit means for producing a value corresponding to the combined inputs, memory means connected to said second operating circuit means for storing the value, exposure indicating means connected to said second operating circuit means, timing circuit means for operating the shutter, and control means establishing a first mode for constraining said second operating circuit means to respond to said light receiving element and said timing circuit means to operate the shutter at a speed determined by the value in said memory means and establishing a flash mode for causing said second operating circuit means to respond to said first operating circuit means and constraining said timing means to operate the shutter at a predetermined speed while the diaphragm is set at an opening corresponding to that indicated by said indicating means.

Claim 5

An exposure setting device for a photographic system with a shutter and a diaphragm as well as a focus arrangement and a flash device, comprising a light receiving element for receiving light from an object and producing a signal corresponding to the light received, variable resistance means coupled to the focusing arrangement for producing a signal corresponding to the distance to an object being photographed, setting means coupled to the diaphragm for producing a signal corresponding to the diaphragm setting, detecting means for producing a signal corresponding to the power of the flash device, first operating circuit means responsive to said detecting means and the variable resistance means, second operating circuit means coupled to said setting means and alternately connectable with said light receiving element and said first operating circuit means for producing a value corresponding to the combined inputs, memory means connected to said second operating circuit means for storing the value, exposure indicating means connected to said second operating circuit means, timing circuit means for operating the shutter, and control means establishing a first mode for constraining said second operating circuit means to respond to said light receiving element and said timing circuit means to operate the shutter at a speed determined by the value in said memory means and establishing a flash mode for causing said second operating circuit means to respond to said first operating circuit means and constraining said timing means to operate the shutter at a predetermined speed while the diaphragm is set at an opening corresponding to that indicated by said indicating means.

Claim 6

The device according to claim 3, which is characterized by that the above mentioned memory means is a condensor or condensors.

Claim 7

A device as in claim 3, wherein said indicating means includes a scale having a series of shutter time readings and a second scale having a series of diaphragm readings as well as an indicator and a viewfinder, one of said scales being shiftable for changing the diaphragm opening.

Claim 8

A device as in claim 3, wherein said indicating means includes a scale having a series of shutter time readings and a fixed mark as well as a finder, said mark and said scale being shiftable relative to each other within the finder.

Claim 9

A device as in claim 3, wherein said second operating circuit means inclUdes a compression circuit alternately responsive to said light receiving element and said variable resistance means for compressing the signals thereof.

Claim 10

A device as in claim 3, wherein said second operating circuit means includes a first compression circuit alternately responsive to light receiving means and said variable resistance means so as to compress their respective outputs logarithmically, a second compression circuit responsive to said setting means for compressing the signal from said setting means logarithmically, and a comparator circuit responsive to the outputs of first and second compression circuits.

Claim 11

A device as in claim 8, wherein said setting means further includes means for producing a signal corresponding to the film sensitivity.

Claim 12

A device as in claim 3 wherein said setting means further includes means for producing a signal corresponding to the film sensitivity.

Claim 13

A device as in claim 3, wherein said detecting means detects the voltage of a main capacitor in the flash device so as to produce a signal corresponding to the guide number.

Claim 14

A device as in claim 3, wherein said indicating means comprises a scanning mechanism which rotates the diaphragm ring in accordance with its instructions so as to set the diaphragm value automatically during operation in the flash mode.