Nippon Kogaku K.k.

Yuji Okubo

Sakuji Watanabe

Mikio Takemae

Osamu Maida

Hiroshi Meguro

An automatic exposure control apparatus for a camera has the shutter release button and the memory shutter release button as switches with slidable contacts, a photodetector for detecting brightness of an object, a capacitor for holding the detected photometric value of the photodetector, and a bias circuit. When the shutter release button is depressed by a first stroke, power is turned on. After framing for a memory lock, the first stroke depression of the shutter release button is released, and the memory lock button is depressed. An exposure memory lock is completed. After framing for photography, the memory lock button is depressed again. Thereafter, the shutter release button is depressed by the first stroke, and a picture is taken. When the shutter release button is released and the memory clock button is released, the exposure memory lock is maintained. The exposure value held by the capacitor can be cancelled when the shutter release button is depressed by the first stroke while the memory lock button is released.

Exposure control apparatus of a camera

A camera includes an exposing device for exposing a photosensitive member with light from an object through an aperture, a detecting device for detecting an object brightness, a controlling device for controlling the exposing device and the aperture so as to obtain a proper exposure of the photosensitive member, a first signal producing device for producing a first signal, a second signal producing device for producing a second signal, a third signal producing device for producing a third signal, and a signal selecting device for selecting one of the first, second and third signals. The controlling device sets an aperture diameter and an exposure time to have a first, second or third relation in accordance with the first, second or third signal when the signal selecting device selects the first, second or third signal, in the order named.

Signal selector for automatic exposure apparatus of camera

A camera in which exposure is controlled by the supply of power from a power source includes a first control device for electrically controlling the time of the exposure, a second control device for mechanically controlling the time of the exposure, a member for selecting one of the first and second control devices, the member being operable to set the time of the exposure, a device for making a binary code in response to the operating member, the binary code including information indicative of one of the first and second control devices selected by the operating member and information indicative of the time of the exposure set by the operating member, and a device for supplying a power from the power source to the first control device when the binary code indicates that the first control device has been selected by the operating member, the first control device being capable of controlling the time of the exposure when the power supply device supplies a power to the first control device.

Camera in which exposure is electrically and mechanically controllable

A camera in which light-sensing means is exposed to the light from an object to be photographed passed through stop means includes means for setting the aperture value of the stop means, means for driving the stop means in a direction in which the aperture value of the stop means is coincident with the aperture value by the setting means, prior to the exposure of the light-sensing means, metering means including a light-receiving element adapted to receive the light from the object passed through the stop means and produce an output corresponding to the intensity of the received light, the metering means producing a metering output corresponding to the brightness of the object on the basis of the output of the light-receiving element, means for controlling the exposure time of the light-sensing means in order that the light-sensing means may obtain a proper exposure, on the basis of the metering output after the stop means has been driven by the driving means, and discriminating means for discriminating, prior to the driving of the stop means, that the intensity of the light received by the light-receiving element after the termination of the driving of the stop means is lower than a predetermined value, on the basis of the metering output before the stop means is driven by the driving means, and putting out a discrimination signal.

Automatic exposure control camera having a low brightness warning device

An exposure control apparatus of a camera comprises exposure control device adjusted to control the quantity of light applied onto a photosensitive film, a device for preparing a photometering output responsive to the quantity of light from an object to be photographed, the preparing device effective to prepare on the basis of the photometering output a first output used to adjust the exposure control device so that the quantity of light applied onto the film is proper, a device for setting the exposure amount by manual operation, the setting device being effective to prepare a second output used to adjust the exposure control device so that the set exposure amount is obtained, selecting device having a first selecting position for making the first output effective and a second selecting position for making the second output effective, in order to adjust the exposure control device, and operating device operated to store the photometering output, the operating device including change-over means operated when the selecting device is in the second selecting position to thereby act on the selecting device and make the first output instead of the second output effective.

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Omiya, Japan

Yuji Okubo