Optics: measuring and testing – Photometers – Photoelectric
Patent
1979-09-14
1984-02-28
Arnold, Bruce Y.
Optics: measuring and testing
Photometers
Photoelectric
356226, G01J 146
Patent
active
044339143
ABSTRACT:
Disclosed herein are system and apparatus for providing an indication of proper photographic exposure for lighting conditions which include both flash and continuous light sources. An optical sensor provides a signal representative of instantaneous existing lighting conditions either to a logarithmic amplifier for continuous lighting condition measurement or to an integrator controlled by a timer for flash ambient lighting condition measurement. A sample and hold circuit receives the integrator output and provides the same to the logarithmic amplifier which is calibrated with respect to the optical sensor. The logarithmic amplifier supplies either continuous or flash exposure indicia to a display, which may comprise either a digital display or a motorized dial. An accessory program input is provided between the logarithmic amplifier and the display to receive compensating signals from optical accessories that may be mated to the optical sensor. Also disclosed herein is optical accessory interface means including an extending member that has an orifice at one end thereof and that is adapted to be disposed within a receiving member that has an optical sensor at one end so as to align the orifice adjacent to the optical sensor.
REFERENCES:
patent: 3709615 (1973-01-01), Blakeslee et al.
patent: 3798662 (1974-03-01), Suzuki
patent: 3884584 (1975-05-01), Tsunekawa et al.
patent: 3909137 (1975-09-01), Kisanuki
Arnold Bruce Y.
Vivitar Corporation
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