Auto/manual switching circuit

Details Auto/manual switching circuit Auto/manual switching circuit

Filed on

1989-07-28

Date issued

1990-06-19

Examiner

Perkey, W. B.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Specific signal processing circuitry

Other Related Categories

3541951, 358227, G03B 300

Type

Patent

Status

active

Patent number

049357620

Description

ABSTRACT:
An auto/manual changing switch cirucit for an auto-focus circuit which allows the changing of states by a one touch system. To change a video camera from an auto-focus state to a manual focus state, a switch is activated. While in this manual state, the auto-focus state can be temporarily engaged by the one touch system wherein the manual focus state is automatically returned to maintaining the temporary auto-focus state. The switching circuit to realize these functions includes a pulse generating circuit for an auto/manual changing switch, an auto-focus changing pulse generating circuit, an auto-focus releasing pulse generating circuit, and an auto/manual focus changing circuit. The changing of state operation is very simple and the focusing of video image during the recording process at a time of changing the focus state does not cause any substantial joggling.

REFERENCES:
patent: 4572643 (1986-02-01), akashi
patent: 4740076 (1988-04-01), Ueda et al.
patent: 4845521 (1989-07-01), Akashi

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