Abstract: An electronic camera electronically records an optical image by using a non solid-state memory and includes an image pickup element, an image pickup section, and an external recording section. The image pickup section includes a solid-state memory means for digital-recording at least one-frame image signals supplied from the image pickup element. The external recording section includes a non solid-state memory means, and a D/A converter for analog-recording a digital image signal supplied from the image pickup section on the non solid-state memory means. The image pickup section and the external recording section are detachable.

Abstract: An electronic camera has an image pickup section and a detachable recording section. The image pickup section includes an image pickup element for converting an optical image into an analog image signal. The image pickup section also includes an analog-to-digital converter for converting the analog image signal into digital image signals which are stored in a digital memory within the image pickup section. The detachable recording section includes a digital-to-analog converter for converting the digital signal output from the image pickup section into an analog signal which is recorded in an analog memory within the recording section.

Abstract: An electronic camera electronically records an optical image by using a memory and includes an image pickup element, an image pickup section, and an external recording section. The image pickup section includes a small capacity memory for recording at least one-frame image signals supplied from the image pickup element. The external recording section includes a memory and a recording head. The external recording section is detachable from the image pickup section.

Abstract: A camera detects which of a number of operating modes is dialed into a flash unit by sensing the current level produced by a source. In response to dialing of a daylight EE mode, the camera measures the brightness of the object to be photographed and conforms the diaphragm aperture to a preselected shutter speed. In one flash mode the flash unit transmits desired aperture and shutter speed data suitable for flash and the camera automatically responds. In another mode, the shutter speed is set into the camera and the camera automatically controls the diaphragm aperture on the basis of data transmitted by the flash unit.

Abstract: A storage device for storing photographic exposure information employs a closed-loop analog-to-digital (A-D) converter circuit includes a counter and a digital-to-analog (D-A) converter. The influence of erroneous signals which are created at the output of the D-A converter when the exposure information is stored in the counter is eliminated. The D-A converter circuit employs a ladder network of coarse accuracy. The stored exposure value, however, is highly accurate because of the closed-loop nature of the A-D converter circuit. Means responsive to the stored value for operating the exposure system of the camera are disclosed.

Abstract: In the camera disclosed, a light measuring device and input data setting device establish exposure control signals which regulate exposure elements. When the control signal is out of range of an element, a switch turns on an adjusting arrangement which resets the setting device. The setting device may preset an element such as the aperture or shutter.

Abstract: The present invention relates to a camera having an exposure control device designed so that the light measurement, the exposure condition determination and the photographing operation are carried out by means of a release means including an electromagnet element to be controlled by means of a plural number of switches operating successively with the release operation of the camera. The invention is characterized in that the time at which the output signal of the control circuit for controlling the operation of the camera after the light measurement in accordance with the magnitude of the output signal of the light measuring means is controlled so as to be delayed in such a manner that a correct operation can be obtained even if the light measuring time is short.

Abstract: A camera which permits change-over between different light measuring systems is disclosed. The camera includes a first light measuring element which measures light coming from an object to be photographed and an operational amplifier responsive to the element. A light measurement information producing circuit is included for producing a light measurement information signal for exposure computation. A change-over device is connected between the light measurement information producing circuit and the operational amplifier. The change-over device is arranged to be shiftable between a first position wherein the operational amplifier is connected to the light measurement information producing circuit and a second position wherein the operational amplifier is not so connected. An accessory device is attachable to the camera body.

Abstract: An automatic exposure control system for cameras of flash photographic capabilities which is switched to either of the daylight or the mode depending upon whether or not a storage capacitor across which a flash tube is connected is sufficiently charged. The system comprises first and second computers for deriving daylight and flash exposure aperture values respectively, a diaphragm control circuit selectively receptive of the outputs of the computers through a first switch, first and second timing circuits for providing daylight and flash exposure times respectively, and a shutter control circuit selectively receptive of the outputs of the timing circuits through a second switch. The system is characterized in the use of a single mode selection actuator which is common to the first and second switches and which causes an automatic selection of the flash mode when the camera release occurs after the attainment of the voltage of the storage capacitor to the normal firing level.

Abstract: In the camera disclosed, an electromagnetic actuator is responsive to a timing pulse of short duration from an exposure control circuit for controlling the closing movement of a shutter. A permanent magnet may accidently be left latched and hold the rear curtain in cocked position after the timing pulse because of possible damage to an electromagnetic control circuit as a result of a battery short circuit. This may cause the film to fog during subsequent winding or rewinding. To prevent this, an indicator produces a visible indication either in the field of view of the camera finder or, in the case of remote shutter operation, outside the camera housing, that the rear curtain must be manually unlatched.

Abstract: A motor drive unit adapted for use with a camera having a motorized shutter speed adjusting device. When a continuous series of frame exposures are to be made at a predetermined frame frequency, the set value of shutter time in the camera is made to be compared with the longest possible shutter time dependent upon that frame frequency by a comparator provided in the motor drive unit. When the actual shutter time value exceeds the longest possible one, the motorized shutter speed adjusting device is actuated, causing the shutter time value to change itself to the longest possible value.

Abstract: In the system disclosed, a feedback circuit connects the output of the last of a plurality of cascaded amplifier stages to the input of the first stage. A photoelectric transducer is connected to one of the stages. The feedback connection compresses the output signal relative to the signal at the photoelectric transducer, logarithmically. Preferably all the stages are linear and the feedback circuit is linear so that no logarithmic members are required. Preferably each of the stages is composed of an amplifier and a connection corresponding to an emitter-follower connection. A suitable system then utilizes the compression characteristic in a shutter control. This system may use a second compression circuit comparable to the first. Additional photographic information may be applied to the input of any of the stages in either compression circuit.

Abstract: A camera having an indication system to determine suitable diaphragm aperture value by measuring the light penetrating through a photographing lens and to indicate the same digitally, wherein when said diaphragm aperture value exceeds the limit value of exposure control of a camera, a warning indication is given by the indication means to indicate the fact that the diaphragm aperture value is outside of control limit, and the number of input/output lead wires to the indication means is reduced. Thus simplifying the set-up.

Abstract: A temperature compensating device for devices comprising semiconductors. The temperature compensating device comprises a temperature compensating circuit, such as a circuit including a diode, and a current control circuit which adjusts the quantity of the electric current flowing through the temperature compensating circuit. The temperature characteristic of the temperature compensating circuit is mutually compensatory with that of the output of the device comprising semiconductors. When the temperature characteristic of the output of said temperature compensating circuit differs from that of the output of such semiconductor device, the current control circuit causes a current which corresponds to the difference between the temperature coefficient of the compensating circuit and that of the semiconductor device to flow through the temperature compensating circuit, so that satisfactory temperature compensation can be accomplished.