Autofocus device for determining an in-focus and real in-focus s

Details Autofocus device for determining an in-focus and real in-focus s Autofocus device for determining an in-focus and real in-focus s

1989-05-03

1990-12-11

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

2502014, 354403, H04N 5232

Patent

active

049774573

ABSTRACT:
Disclosed is an autofocus device, particularly an autofocus device in which focus detection is effected repeatedly. A determination is made as to whether or not a determination of the in-focus state is made continuously for a predetermined duration upon repeated detection of focus after an initial in-focus determination is made. While the determinations of the in-focus state are being made for the predetermined duration after the initial determination on the in-focus state is made, the terminals of the motor are short-circuited to apply brakes to it, and after the aforementioned duration, the motor terminals are opened, thereby stopping the motor.

REFERENCES:
patent: 4392726 (1983-07-01), Kimura
patent: 4523829 (1985-06-01), Eguchi et al.
patent: 4531157 (1985-07-01), Ishikawa
patent: 4531158 (1985-07-01), Murakami et al.
patent: 4635124 (1987-01-01), Andreatti, Jr. et al.
patent: 4706124 (1987-11-01), Baba et al.
patent: 4745425 (1988-05-01), Kusaka

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