Camera controls

Claim 2

In a camera having a shutter, shutter-opening means coacting with the camera shutter for opening the latter to commence an exposure, shutter-closing means coacting with the camera shutter for closing the latter to terminate the exposure, control capacitor means coacting with said shutter-opening means for commencing charging and discharging operations in synchronism with the opening of the shutter, memory capacitor means connected in series with said control capacitor means and said shutterclosing means for storing exposure-determining information, signal-transmitting means coacting with said memory capacitor means for transmitting to the latter signals of exposuredetermining factors, and charge-control means electrically connected with said control capacitor means for regulating the change in the charge thereof, both of said capacitor means and said shutter-closing means coacting with each other to close the shutter after an exposure time which will provide correct exposure for the particular exposure-determining factors transmitted to said memory capacitor means by said signaltransmitting means, said charge-control means including a constant-voltage circuit means and a diode electrically connected with said control capacitor means for regulating the operation thereof when the shutter is opened.

Claim 3

The combination of claim 1 and wherein said control capacitor means and diode are in series.

Claim 4

The combination of claim 1 and wherein said control capacitor means and diode are in parallel.

Claim 5

The combination of claim 1 and wherein said signal-transmitting means is electrically connected to said memory capacitor means for transmitting thereto signals of object brightness, film speed, and aperture size, in the form of a logarithmically compressed composite signal, and said charge-control means being electrically connected with said control capacitor means for regulating the change in the charge thereof according to an arithmetic progression.

Claim 6

The combination of claim 4 and wherein said memory capacitor means has two terminaLs, said signal-transmitting means being electrically connected with one of said terminals for transmitting a logarithmically compressed signal of object brightness to said one of said terminals and said signal-transmitting means being electrically connected to the other of said terminals for transmitting a logarithmically compressed signal of aperture and film speed to the other of said terminals.

Claim 7

The combination of claim 5 and wherein a high input impedance transistor means has an input pole electrically connected to said one terminal of said memory capacitor means, a timing switch being electrically connected with said control capacitor means, and a pole of a power source being electrically connected to said timing switch, said signal-transmitting means being electrically connected to the latter pole through said timing switch, and said signal-transmitting means also being connected electrically to one terminal of said control capacitor means.

Claim 8

The combination of claim 4 and wherein said memory capacitor means has two terminals, said signal-transmitting means being electrically connected with one of said terminals for transmitting the entire composite logarithmically compressed signal of the exposure-determining factors to said one of said terminals and said control capacitor means being electrically connected to the other of said terminals.

Claim 9

The combination of claim 7 and wherein a high input impedance transistor means has an input pole electrically connected to said one terminal of said memory capacitor means, a timing switch being electrically connected with said other terminal of said memory capacitor means, said switch being grounded so that through the latter switch said other terminal of said memory capacitor means which is electrically connected with said control capacitor means is connected to ground.

Claim 10

In a camera having a shutter, shutter opening means coacting with the camera shutter for opening the latter to commence an exposure, shutter closing means coacting with the camera shutter for closing the latter to terminate the exposure, control capacitor means coacting with said shutter-opening means for commencing charging and discharging operations in synchronism with the opening of the shutter, memory capacitor means connected in series with said control capacitor means and said shutter-closing means for storing exposure-determining information, and signal-transmitting means coacting with said memory capacitor means for transmitting to the latter signals of exposure-determining factors, both of said capacitor means and said shutter-closing means coacting with each other to close the shutter after an exposure time which will provide correct exposure for the particular exposure-determining factors transmitted to said memory capacitor means by said signal-transmitting means, said signal-transmitting means including a potentiometer adjusted according to aperture size, said potentiometer having a slider, and said signal-transmitting means transmitting to said slider a voltage in accordance with object brightness, a power source having positive and negative electrodes between which said potentiometer is located, and a pair of semiconductors having, respectively, positive and negative temperature coefficients of resistance, said potentiometer being situated between and connected in series with said semiconductors and each of the latter being situated between said potentiometer and one of the electrodes of the power source, respectively.

Claim 11

In a camera having a shutter, shutter opening means coacting with the camera shutter for opening the latter to commence an exposure, shutter closing means coacting with the camera shutter for closing the latter to terminate the exposure, control capacitor means coacting with said shutter-opening means for commencing charging and discharging operations in synchronism with the opening of the shutter, memory capacitor means connected in series with said control capacitor means and said shutter-closing means for storing exposure-determining information, and signal-transmitting means coacting with said memory capacitor means for transmitting to the latter signals of exposure-determining factors, both of said capacitor means and said shutter-closing means coacting with each other to close the shutter after an exposure time which will provide correct exposure for the particular exposure-determining factors transmitted to said memory capacitor means by said signal-transmitting means, said signal-transmitting means including a potentiometer adjusted according to aperture size, said potentiometer having a slider, and said signal-transmitting means transmitting to said slider a voltage in accordance with object brightness, a power source having positive and negative electrodes between which said potentiometer is located, and a pair of semiconductors having, respectively, positive and negative temperature coefficients of resistance, said potentiometer being situated between and connected in series with said semiconductors and each of the latter being situated between said potentiometer and one of the electrodes of the power source, respectively.