1988-03-02
1989-06-27
Adams, Russell E.
354484, G03B 300
Patent
active
048434167
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.
REFERENCES:
patent: 3639048 (1972-02-01), Heaney
patent: 4394077 (1983-07-01), Yoshino et al.
patent: 4415245 (1983-11-01), Harvey
patent: 4459003 (1984-07-01), Kagechika
patent: 4473285 (1984-09-01), Winter
patent: 4479706 (1984-10-01), Takahashi
patent: 4518253 (1985-05-01), Takahashi
patent: 4533227 (1985-08-01), Takahashi
Adams Russell E.
W. Haking Enterprises Limited
LandOfFree
Autofocus camera system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Autofocus camera system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Autofocus camera system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-816713