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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4350426 | Time determination circuit for camera A time determination circuit for an automatic or manual exposure camera in which a single capacitor is utilized for both a power maintaining time determination circuit and a shutter controlling time determination circuit to thereby significantly reduce th... | 09/21/1982 |
| 4310230 | Apparatus for preventing malfunction of an electric shutter device Apparatus for preventing a malfunction of an electric shutter device is disclosed which comprises a source voltage detection circuit and a demagnetizing device connected with the output terminal of the detection circuit. The source voltage detection circu... | 01/12/1982 |
| 4294525 | Camera having a digital exposure value display device 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 obtaine... | 10/13/1981 |
| 4278336 | Operation detecting device for camera The present invention is directed to an operation detecting device of a camera for detecting the operation of an operation member such as the shutter member. The operation detecting device functions by detecting the electrical signal produced at the time ... | 07/14/1981 |
| 4089015 | Dual function exposure time display and control circuit for SLR camera A light meter circuit for an SLR camera implements full aperture viewfinding with a preselected exposure time by providing an integrating capacitor 25 for controlling the exposure time, a first switch 24 for enabling the charging of the capacitor, circuit... | 05/09/1978 |
| 4084166 | Circuit for locking led light meter display in response to meter display in response to mirror movement in SLR camera An SLR camera includes a light measuring and computing circuit 1-7 whose output is fed to a comparator 8 together with the analog output of a D/A converter 12 coupled to a bidirectional counter 13. The counter is servo-loop driven to achieve circuit balan... | 04/11/1978 |
| 4054888 | Motor driven photographing control circuit A motor driven photographing control circuit for a double preference type automatic exposure control camera which is used for continuous photographing with a motor drive device attached thereto. When a sum of the shutter time computed by a shutter time co... | 10/18/1977 |
| 4047210 | Camera with an electronic timer and including an electro-mechanical delayed action stop for the shutter drive A camera is provided having an electronic timer controlled by ambient light. There is provided an electromechanical delayed action stop for the shutter. An electronic delay device is provided for temporarily delaying the action of the shutter of the camer... | 09/06/1977 |
| 4041504 | Photographic exposure setting device Photographic exposure setting device comprising an exposure time setting unit and two units for indicating insufficient and excessive illumination intensity which determine the degree of illumination of an object being photographed, these units being cons... | 08/09/1977 |
| 3988750 | Exposure time indicating device for camera shutter An exposure time indicating apparatus for a camera shutter having a switching circuit that has a switching level which is compensated for the brightness of an object or field of exposure. The apparatus includes an indicating circuit that indicates the exp... | 10/26/1976 |
| 3987464 | Electronic shutter control circuit having exposure time indicator An electronic camera shutter control circuit having an indicator for indicating when the camera shutter is open. A circuit responsive to a control signal controls a current flow through an electromagnet which is energized during the opening of the camera ... | 10/19/1976 |
| 3964075 | Photographing apparatus In the photographic apparatus disclosed a long-exposure adapter is attached to a camera to lengthen the camera's shutter operating times. When the camera's light sensing system responds to a low illumination by setting the shutter time to B (infinite time... | 06/15/1976 |
| 3962709 | Exposure time control circuit An exposure time control circuit for a camera shutter having a light-responsive element that controls charging of a capacitor as a function of the intensity of the light from a scene to be photographed. The charge of the capacitor at a certain level activ... | 06/08/1976 |
| 3947855 | Electric shutter means with battery checking circuit An electric shutter means which comprises a voltage checking circuit connected to an exposure time control circuit including an electromagnet for controlling the time of closing shutter blades so that, when the voltage of a power source battery for said e... | 03/30/1976 |
