Abstract: An exposure control device of a camera comprises first metering means for effecting metering while dividing an object into a plurality of metering areas and for generating a first metering output determining the exposure of the entire object on the basis of a plurality of photoelectric outputs corresponding to said areas, second metering means for generating a second metering output corresponding to the object light passed through the aperture of a phototaking lens, first operational means for generating a first operation output including information on the difference between the first metering output and the second metering output, second operational means for synthesizing the second metering output during the stop-down of said aperture and the first operation output and generating a second operation output, and blocking means for blocking the stop-down when the second operation output and an output corresponding to a preset shutter speed assume a predetermined relation.

Abstract: In an electroflash unit attachable to a camera provided with a circuit for measuring light transmitted through a photographing lens, a signal by which TTL flash output control circuit on the camera's side can be actuated is generated. The electroflash unit comprises;(1) a terminal for connection to the camera(2) a circuit for effecting flashing(3) a circuit for terminating said flashing in accordance with the output from said light measuring circuit on the camera and(4) a circuit for generating, on said terminal, a predetermined signal by which said light measuring circuit is brought into the state ready for operation.

Abstract: In a camera usable with an electronic flash device and including an indicating element adapted to be operated when the electronic flash device has become capable of emitting flashlight, an electric shutter and a voltage detecting circuit for detecting the voltage of a battery for driving the electric shutter, there is provided a control circuit for rendering the indicating element inoperative in response to the output of the detecting circuit when the voltage of the battery is below a predetermined value, independently of whether or not the electronic flash device is in flashlight emission capable condition.

Abstract: The number of terminals between a camera and an attachment can be reduced by a new combination of camera and attachment.

Abstract: An electric wind-up device for driving a film feed mechanism in a camera after exposure comprises wind-up terminating means for detecting an increase in resistance in the film feed mechanism to stop rotation of a motor when the film has been wound up by one frame or completely drawn out of a magazine, and counter means for counting the exposed frames and generating a count signal when a predetermined number of frames are counted. The wind-up device further comprises means co-operating with the counter means for outputting a motor energizing signal after exposure. The co-operating means outputs the motor energizing signal even when the count signal is not energized.

Abstract: An electric wind-up device of a camera for winding up a film by a motor after exposure has been completed by shutter means closing an aperture comprises switch means responsive to the aperture closing operation of the shutter means to operate before the exposure is completed, and a delay circuit operable by the switch means to put out a film advance signal for driving the motor after the exposure has been completed.

Abstract: A display circuit for displaying analog input voltages in a digital fashion using a parallel comparison type analog-digital converter includes a voltage generator for generating a plurality of reference voltages quantized at a predetermined voltage width, a plurality of comparators corresponding to the plurality of reference voltages for comparing the reference voltages and an analog input voltage as input, and display means for encoding and displaying the output of the plurality of comparators, is provided with modulating apparatus for modulating one of the inputs of each of the plurality of comparators periodically within the range of the predetermined voltage width.

Abstract: In a flash unit including a power source portion including a battery and a heavy current consuming source; a flash discharge tube adapted to produce flashlight by the current from the power source portion; flash output control means for metering the reflected flashlight from an object and stopping light emission of the flash discharge tube when a predetermined quantity of light is reached, thereby effecting flash output control operation; and means using the battery as a power source and indicating performance or non-performance of the flash output control operation, there is provided control means for limiting the operation of the heavy current consuming source of the power source portion for a predetermined period during the indication.

Abstract: A motor drive device to be coupled with a camera for driving a film advancing mechanism thereof. Each of said camera and motor drive device is provided with an electric control device and a power supply circuit for power supply to the electric control device. The camera is provided with a power supply control circuit for controlling power supply from the power supply circuit of the camera to the electric control device of the camera. The power supply control circuit is adapted to receive power supply from the power supply circuit of the camera with the motor drive device. The motor drive device has means for controlling the power supply from the power supply circuit of the motor drive device in synchronization with the control function of the power supply control circuit upon electric connection with the camera.

Abstract: A flash output control photography failure warning device in a camera is provided with a quantity-of-light detecting circuit adapted to start operating in synchronism with shutter release and to change from a first condition to a second condition when the integrated amount of the light from an object reaches a predetermined value, a time counting circuit for counting a predetermined time T.sub.2 greater than the longest light emission time of a flashlight discharge tube in synchronism with shutter release, a memory circuit adapted to start memorizing the condition of the quantity-of-light detecting circuit after the longest light emission time of the flashlight discharge tube and before the predetermined time T.sub.2 and to memorize it till a predetermined time T.sub.3, a discrimination circuit for discriminating that the condition of the quantity-of-light detecting circuit memorized by the memory circuit at a point of time whereat the time counting circuit has counted the predetermined time T.sub.

Abstract: A motor driven camera has a power source, a motor connected to the power source and driven by the voltage of the power source, a constant voltage circuit for converting the voltage of the power source into a predetermined constant voltage and putting out the constant voltage, and an electric circuit connected to the constant voltage circuit and driven by the constant voltage circuit. The camera further has a battery checking device which includes a discriminating circuit for receiving the output of the constant voltage circuit and the output of the power source, comparing the two outputs and discriminating whether the voltage of the power source is above a predetermined level, and an indication circuit for receiving the output of the discriminating circuit and indicating the condition of the power source.

Abstract: A camera in which a shutter device is charged in response to film wind-up and is released by shutter operating means to effect exposure, and including a change-over device displaceable for setting a film transport mechanism corresponding to each of film wind-up and rewind conditions, comprises means for preventing the operation of the shutter device in response to the displacement of the change-over device for setting the film transport mechanism in film rewind condition.

Abstract: An indicator arrangement includes comparators for parallel comparison of an analog input voltage with digitalizing standard voltages to digitalize the input voltage and an indicator for indicating digitalized output. The arrangement is provided with a controller periodically switched between a first control state and a second control state. The controller in the first control state allows the comparators to perform comparison in a first voltage range of the analog input voltage while in the second control state it allows the comparators to perform comparison in a second voltage range of the analog input voltage.There is provided an encoder for coding the digitalized output of the comparators with a first coding mode in the first control state of the controller and coding the digitalized output of the comparators with a second coding mode in the second control state. The encoder is adapted to drive the indicator with a first or second mode according to the state of the controller.

Abstract: A power supply circuit for use in a camera comprising solenoids for shutter release or shutter control etc. to be controlled by the proper vibration frequency of a piezoelectric element, comprising a constant voltage circuit for generating electric power for driving said solenoids, a switching circuit for supplying electric power from a power source of a motor drive unit to said constant voltage circuit in response to the actuation of a shutter button, and a voltage converting circuit for continuously supplying electric power from said power source of said motor drive unit to an oscillation circuit containing said piezoelectric element.

Abstract: An electric driving device of a camera for winding up a film by a motor comprises means for generating a windup signal when an exposure has been completed, means operable by reception of the wind-up signal to drive the motor for said wind-up, torque detecting means for detecting an increase in wind-up torque resulting from completion of said wind-up and putting out an output, and forcible stopping means responsive to the output of the torque detecting means to stop the motor separately from the operation of the motor driving means.

Abstract: A device to which a plurality of battery cases having different nominal voltages are selectively mountable and which checks the battery voltage of a mounted case comprises signal apparatus provided on each of the cases and which emits a discrimination signal capable of discriminating which of the cases has been mounted, voltage check apparatus including a plurality of voltage check circuits corresponding to the cases to check each of the output voltages of the batteries contained in the cases, and apparatus operatively associated with the signal apparatus during said mounting for selecting one of the voltage check circuits in accordance with the discrimination signal and applying to the selected voltage check circuit the output voltage of the battery contained in the mounted case as a voltage to be checked.

Abstract: A camera has a digital exposure display device and a digital fixed point match type exposure display device. The digital exposure display device compares a voltage associated with an exposure value such as a shutter time value or an aperture value obtained from exposure operating means with a plurality of reference voltages produced by a reference voltage generating circuit and thereby converts the exposure value into a digital signal and digitally displays the exposure value on the basis of said digital signal.

Abstract: A capacitor charging circuit in a camera has switch means series-connected between a DC power source and a release magnet energizing capacitor. The switch means comprises a parallel connection of an emitter-grounded transistor for a first switch with the capacitor as the load and a collector-grounded transistor for a second switch with the capacitor as the load.

Abstract: A circuit for controlling a camera or a motor drive device by means of a control switch unit connected through a pair of connecting terminals thereof to a pair of remote control terminals of said camera or motor drive device, wherein the control switch unit comprises plural control switches and a voltage generating circuit adapted for generating plural different voltages in response to various combinations of the states of said control switches; and said camera or motor drive device comprises plural voltage detecting circuits of different detecting voltages for detecting the voltages supplied to the remote control terminals. The camera or motor drive device is controlled in response to the outputs from said voltage detecting circuits.

Abstract: An indicator arrangement includes comparators for parallel comparison of an analog input voltage with digitalizing standard voltages to digitalize the input voltage and an indicator for indicating digitalized output. The arrangement is provided with a controller periodically switched between a first control state and a second control state. The controller in the first control state allows the comparators to perform comparison in a first voltage range of the analog input voltage while in the second control state it allows the comparators to perform comparison in a second voltage range of the analog input voltage.There is provided an encoder for coding the digitalized output of the comparators with a first coding mode in the first control state of the controller and coding the digitalized output of the comparators with a second coding mode in the second control state. The encoder is adapted to drive the indicator with a first or second mode according to the state of the controller.