Exposure factor setting device for a camera

Claim 2

An exposure factors setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding a first exposure factor manually set; (c) a computer circuit response to said first and said second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a changeable fourth electrical signal corresponding to an exposure factor to be manually set and of the same kind as that of said second exposure factor; (e) exposure factor indicating means; and (f) first means for transferring the third electrical signal from said computer circuit and the fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating means during manual adjustment of the shutter speed and the diaphragm aperture in the manual exposure mode so said second variable exposure factor setting means may be varied until coincidence of the display content of the exposure factor indicating means is attained.

Claim 3

An exposure factors setting device according to claim 1, wherein said first means includes: (a) a first gate circuit connected between said computer circuit and said exposure factor indicating means; (b) a second gate circuit connected between said second variable exposure factor setting means and said exposure factor indicating means; and (c) a pulse generator having two output terminals, one of which is connected to said first gate circuit for controlling gating on and off of the first gate circuit and the other of which provides an output signal of the opposite phase to that of the first-named output terminal and which is connected to said second gate circuit for controlling gating on and off of said second gate circuit.

Claim 4

An exposure factors setting device for a camera comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding a first exposure factor manually set; (c) a computer circuit responsive to said first and said second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a fourth electrical signal corresponding to an exposure factor to be manually set and of the same kind as that of said second exposure factor; (e) exposure factor indicating means; (f) first means for transferring the third electrical signal from said computer circuit and the fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating means alternately, whereby said second variable exposure factor setting means is varied until the coincidence of display content of the exposure factor indicating means is attained, (g) a first gate circuit provided in the data path line between said computer circuit and said exposure factor indicating means; (h) a second gate circuit provided in a data path between said variable exposure factor setting means and said exposure factor indicating means; (i) a pulse generator; (j) an inverting circuit; and (k) an frequency divider having an input terminal connected to said pulse generator for dividing the frequency of pulses from said pulse generator and having an output terminal connected directly to said first gate circuit for gating on and off said first gate circuit in response to the divided pulses and also connected through said inverting circuit to said second gate circuit for gating on and off said second gate circuit in response to the divided pulses.

Claim 5

An exposure factors setting device for a camera comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding a first exposure factor manually set; (c) a computer circuit responsive to said first and said second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a fourth electrical signal corresponding to an exposure factor to be manually set and of the same kind as that of said second exposure factor; (e) exposure factor indicating means; (f) first means for transferring the third electrical signal from said computer circuit and the fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating means alternately, whereby said second variable exposure factor setting means is varied until the coincidence of display content of the exposure factor indicating means is attained, (g) a first gate circuit provided in the data path line between said computer circuit and said exposure factor indicating means; (h) a second gate circuit provided in a data path between said variable exposure factor setting means and said exposure factor indicating means; (i) a pulse generator; (j) an inverting circuit; and (k) an frequency divider having an input terminal connected to said pulse generator for dividing the frequency of pulses from said pulse generator and having an output terminal connected directly to said first gate circuit for gating on and off said first gate circuit in response to the divided pulses and also connected through said inverting circuit to said second gate circuit for gating on and off said second gate circuit in response to the divided pulses.

Claim 6

An exposure factors setting device according to claim 2, wherein said pulse generator is formed by an astable multivibrator.

Claim 7

An exposure factors setting device according to claim 4, wherein said first gate circuit includes a switching element having a control electrode connected to one of the output terminals of said astable multivibrator.

Claim 8

An exposure factors setting device according to claim 5, wherein said switching element is formed by a transistor.

Claim 9

An exposure factors setting device according to claim 6, wherein said transistor is an npn type transistor.

Claim 10

An exposure factors setting device according to claim 4, wherein said second gate circuit includes a switching element having a control electrode connected the other output terminal of said astable multivibrator.

Claim 11

An exposure factors setting device according to claim 8, wherein said switching element is formed by a transistor.

Claim 12

An exposure factors setting device according to claim 9, wherein said transistor is an npn type transistor.

Claim 13

An exposure factors setting device according to claim 1, wherein said exposure factor indicating means is a meter.

Claim 14

An exposure factors setting device for a camera comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding a first exposure factor manually set; (c) a computer circuit responsive to said first and said second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a fourth electrical signal corresponding to an exposure factor to be manually set and of the same kind as that of said second exposure factor; (e) exposure factor indicating means, and (f) first means for transferring the third electrical signal from said computer circuit and the fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating means alternately, whereby said second variable exposure factor setting means is varied until the coincidence of display content of the exposure factor indicating means is attained, said exposure factor indicating means including a meter, said second variable exposure factor setting means being varied until the flickering of the pointer of said meter stops.

Claim 15

An exposure factors setting device for a camera comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding a first exposure factor manually set; (c) a computer circuit responsive to said first and said second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a fourth electrical signal corresponding to an exposure factor to be manually set and of the same kind as that of said second exposure factor; (e) exposure factor indicating means, and (f) first means for transferring the third electrical signal from said computer circuit and the fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating means alternately, whereby said second variable exposure factor setting means is varied until the coincidence of display content of the exposure factor indicating means is attained, said exposure factor indicating means including a meter, said second variable exposure factor setting means being varied until the flickering of the pointer of said meter stops.

Claim 16

An exposure factors setting device according to claim 1, wherein said exposure factor indicating means includes a plurality of indicating elements selectively lighted on in response to input signal.

Claim 17

An exposure factors setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) aperture size setting means for producing a second electrical signal corresponding to an aperture size value manually set; (c) a computer circuit responsive to said first and said second electrical signals for producing a third electrical signal corresponding to a shutter speed value capable of providing a correct exposure; (d) variable shutter speed setting means for producing a fourth electrical signal corresponding to a shutter speed value manually set; (e) indicating means for indicating shutter speed value; and (f) gate means for transferring said third electrical signal from said computer circuit and said fourth electrical signal from said variable shutter speed setting means alternately to said indicating means during manual adjustment of the shutter speed and the diaphragm aperture in the manual exposure mode so that said variable shutter speed setting means may be varied until the coincidence of display content of said indicating means is attained.

Claim 18

An exposure factors setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) aperture size setting means for producing a second electrical signal corresponding to an aperture size value manually set; (c) a computer circuit responsive to said first and said second electrical signals for producing a third electrical signal corresponding to a shutter speed value capable of providing a correct exposure; (d) variable shutter speed setting means for producing a fourth electrical signal corresponding to a shutter speed value manually set; (e) indicating means for indicating shutter speed value; and (f) gate means for transferring said third electrical signal from said computer circuit and said fourth electrical signal from said variable shutter speed setting means alternately to said indicating means during manual adjustment of the shutter speed and the diaphragm aperture in the manual exposure mode so that said variable shutter speed setting means may be varied until the coincidence of display content of said indicating means is attained.

Claim 19

An exposure factor setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding to a first exposure factor manually set; (c) a computer circuit responsive to said first and second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a changeable fourth electrical signal corresponding to an exposure factor which is to be manually set and is of the same kind as that of said second exposure factor; (e) exposure factor indicating means; (f) a first gate circuit provided in a data path line between said computer circuit and said exposure factor indicating means; (g) a second gate circuit provided in a data path between said variable exposure factor setting means and said exposure factor indicating means; (h) a pulse generator; (i) an inverting circuit; and (j) a frequency divider having an input terminal connected to said pulse generator for dividing the frequency of pulses from said pulse generator and having an output terminal connected directly to said first gate circuit for gating on and off said first gate circuit in response to the divided pulses and also connected through said inverting circuit to said second gate circuit for gating on and off said second gate circuit in response to the divided pulses.

Claim 20

An exposure factor setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding to a first exposure factor manually set; (c) a computer circuit responsive to said first and second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a changeable fourth electrical signal corresponding to an exposure factor which is to be manually set and is of the same kind as that of said second exposure factor; (e) exposure factor indicating means; (f) a first gate circuit provided in a data path line between said computer circuit and said exposure factor indicating means; (g) a second gate circuit provided in a data path between said variable exposure factor setting means and said exposure factor indicating means; (h) a pulse generator; (i) an inverting circuit; and (j) a frequency divider having an input terminal connected to said pulse generator for dividing the frequency of pulses from said pulse generator and having an output terminal connected directly to said first gate circuit for gating on and off said first gate circuit in response to the divided pulses and also connected through said inverting circuit to said second gate circuit for gating on and off said second gate circuit in response to the divided pulses.

Claim 21

An exposure factor setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding to a first exposure factor manually set; (c) a computer circuit responsive to said first and second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a changeable fourth electrical signal corresponding to an exposure factor which is to be manually set and is of the same kind as that of said second exposure factor; (e) an exposure factor indicating meter; and (f) change over means for alternately transferring the third electrical signal from said computer circuit and the instantaneous fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating meter during the manual adjustment of the shutter speed and diaphragm aperture in the manual exposure mode, whereby said second variable exposure factor setting means is varied until the flickering of the pointer of said meter stops.

Claim 22

An exposure factor setting device for a camera having a manual exposure mode for controlling exposure time and an aperture size in accordance with a shutter speed and a diaphragm aperture which are manually adjusted, the exposure factor setting device comprising: (a) light sensitive means for producing a first electrical signal corresponding to the brightness of a scene being photographed; (b) first exposure factor setting means for producing a second electrical signal corresponding to a first exposure factor manually set; (c) a computer circuit responsive to said first and second electrical signals for producing a third electrical signal corresponding to a second exposure factor capable of providing a correct exposure; (d) second variable exposure factor setting means for producing a changeable fourth electrical signal corresponding to an exposure factor which is to be manually set and is of the same kind as that of said second exposure factor; (e) an exposure factor indicating meter; and (f) change over means for alternately transferring the third electrical signal from said computer circuit and the instantaneous fourth electrical signal from said second variable exposure factor setting means to said exposure factor indicating meter during the manual adjustment of the shutter speed and diaphragm aperture in the manual exposure mode, whereby said second variable exposure factor setting means is varied until the flickering of the pointer of said meter stops.