Automatic focusing apparatus having an automatic offset voltage

Details Automatic focusing apparatus having an automatic offset voltage Automatic focusing apparatus having an automatic offset voltage

1987-12-09

1989-09-19

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354402, H04N 326

Patent

active

048686662

ABSTRACT:
An automatic focusing apparatus for a video camera converts the quantity of reflected light reflected by an object into an electric signals by light receiving elements. The electric signals are detected and the detected signals are integrated by integrators once every fixed period. A decision is made on the basis of the respective outputs of the integrators whether or not the video camea is in focus. The detectors and the integrators have offset voltages, respectively. The outputs of the integrators are sampled and held and are compared with a reference voltage equal to a voltage for resetting the integrators. Signals representing the result of the comparison are fed back to the detectors or to the integrators to regulate the offset voltages of the detectors and the integrators.

REFERENCES:
patent: 4320417 (1982-03-01), Hanma
patent: 4531158 (1985-07-01), Murakami
patent: 4611244 (1986-09-01), Hanma

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