Autofocus camera system
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United States of America Patent
Stats
-
Jun 27, 1989
Grant Date -
N/A
app pub date -
Mar 2, 1988
filing date -
Mar 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An infrared ranging system for a battery-powered camera uses a light-emitting diode and associated pulse circuitry for producing a single ranging flash concentrated by a lens into a narrow cone of light generally centrally located in the field of view. The diode is powered by a capacitor bank charged in parallel and discharged in series to provide the necessary current pulse to the diode from a 2.0 volt system. The received pulse is concentrated on a photosensing diode by means of an infrared-passing lens to produce a voltage pulse related to amplitude of the reflected light, and hence to the range to a centrally located object in the field, this pulse being processed to set the state of one or more range-indicating latch circuits. The state of the latch circuits is used to govern the final setting of a driven adjustable focus lens. The system is equally applicable to setting the camera aperture in flash mode wherein the aperture is a range-dependent function.
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Cited Art Landscape
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