Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1990-12-28
1992-10-20
Adams, Russell E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 1, 356 4, 2502014, 358227, G03B 1336
Patent
active
051574357
ABSTRACT:
The present invention relates to an automatic focusing apparatus for a video camera and the method thereof, and particularly to an automatic focusing apparatus for a video camera of an active type using infrared light and the method thereof. The present invention comprises a light emitting part, a light-receiving part, first and second current-voltage converters, a selector, a filter, an amplifying integrator, a comparing part, a microcomputer, a motor driver, and an infrared LED driver. After the infinitesimal currents, which are position detecting signals of both channels supplied to the light-receiving part, are converted to voltage signals in current-voltage converters, the voltage signals are selected in the selector with time-division to be processed in one channel by a filter, an amplifying integrator, and a comparator, so that the hardware amount is decreased. The control signals for driving the infrared LED and the AF motor are converted to a count value and are processed with software, thereby increasing the reliability and the stabilization of the system.
REFERENCES:
patent: 4796044 (1989-01-01), Amanuma et al.
patent: 4855585 (1989-08-01), Nonaka
patent: 4857717 (1989-08-01), Chino
patent: 5008695 (1991-04-01), Nagaoka et al.
Jeong Su-yeol
Min Chun-Gi
Adams Russell E.
Samsung Electronics Co,. Ltd.
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