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| Number | Title | Issue Date |
| 4444481 | Exposure control circuit for a camera An exposure control circuit for camera comprises an integrating circuit including a plurality of capacitors for integrating a photocurrent which depends on the brightness of an object being photographed. The integrated voltage is compared against a decisi... | 04/24/1984 |
| 4363541 | Photographing apparatus A photographing apparatus employs a real time photometry technique, and includes a central processing unit to which information concerning the characteristic of a film such as a film speed and other information relating to photographing conditions are sup... | 12/14/1982 |
| 4311375 | Light measuring circuit for photographic cameras A photo-electric converting element converts an incident light into a photo-electric signal corresponding to the illumination of the incident light. The photo-electric signal converted is amplified by a plurality of amplifiers. A discriminating circuit ju... | 01/19/1982 |
| 4309088 | Film magazine having an identity mark for identifying sensitivity of the film and a camera therefor A film magazine is provided with a peripheral surface carrying at least one photoelectrically discriminatable strip-like mark indicative of the sensitivity of film contained within the magazine, and a photographic camera having a shutter operating circuit... | 01/05/1982 |
| 4231644 | Electrical shutter for camera An electrical shutter comprises a first detent member which maintains a shutter drive member at its start position, and a second detent member which maintains a shutter in its open position. Upon abutment of the shutter drive member, both the first and se... | 11/04/1980 |
| 4189221 | Electrical shutter circuit An electrical shutter control circuit of the type which is integrated directly is disclosed. The light receiving element is connected across the input terminals of an operational amplifier, and a switch connects one of at least two integrating capacitors ... | 02/19/1980 |
| 4064517 | Photometric apparatus for single lens reflex camera A photometric apparatus for single lens reflex camera and of the type in which an exposure value is determined by photometry of light which is transmitted through a photographic optical system and is reflected by at least one of the surfaces of a shutter ... | 12/20/1977 |
| 4045806 | Extended range exposure control system An extended range exposure control system for photographic cameras having an aperture plate slidably movable from a first position in which it stops down the maximum relative aperture of the camera lens to second and third positions in which a photographi... | 08/30/1977 |
