Abstract:
An automatic photographic camera which features automatic exposure control, automatic flash operation and automatic film advance and shutter cocking, includes an electronic control circuit featuring a logic circuit which is responsive to a number of parametric signals to effect a control of the timing and actuation of the several automatic functions of the camera.
Abstract:
1,225,917. 917. Light-responsive control circuits. HONEYWELL Inc. July 25, 1969 [July 25, 1968], No.37410/69. Heading G1A . [Also in Divisions G2-G3, H2 and H3-H5] Photographic flash apparatus comprises circuit means to initiate a flash, e.g. in an electronic flash tube, and a light-responsive control circuit to to control the duration of the flash either identical to that described in Specification 1, 225, 916 or including the modifications of this circuit detailed in Figs.2 or 3 (not shown). The main claim relates to circuit means operable to initiate a flash, a light-responsive control circuit arranged to generate an output signal when a light-sensitive device within the control circuit has been exposed to a predetermined total quantity of light, terminating means responsive to an output signal from the control circuit either effectively to terminate the flash or to actuate means for otherwise effectively terminating the exposure of the film in an associated camera and gating means for controlling the operative condition of the light-responsive control circuit, said gating means being coupled to said circuit means at points across which a significant voltage change occurs on initiation of a flash, and being arranged to operate so that the control circuit is free to operate only for a period following the occurrence of said voltage change. The modifications are only to the gating circuit including the addition of further resistors, a capacitor, and a diode to the transistor (42) circuit, (Fig.2), and the use of a silicon controlled rectifier and a further transformer instead of the transistor circuit, (Fig.3).
Abstract:
An automatic photographic camera, which features automatic focusing, automatic exposure control, automatic flash operation and automatic film advance and shutter cocking, includes an electronic control circuit. The electronic control circuit includes a binary logic circuit which is responsive to a number of parametric signals to effect a control of the timing and actuation of the several automatic functions of the camera.