Focusing apparatus for use in video camera

Details Focusing apparatus for use in video camera Focusing apparatus for use in video camera

1987-07-17

1988-04-26

Adams, Russell E.

Optics: motion pictures

Removable film strip magazine type

3541951, 352140, 358227, G03B 300

Patent

active

047400765

ABSTRACT:
A focusing apparatus for performing the switching operation between the automatic focuse mode and the manual command focuse mode. The focusing apparatus includes a selection circuit which is provided between an automatic focusing circuit and a manual command focusing circuit for selectively deriving first or second drive signals therefrom so that either of the first or second drive signals is supplied to a drive device for allowing the movement of a focusing lens in the optical axis directions. The manual command focusing circuit is arranged to generate the second drive signal in response to a manipulation of a switch device, the output of which is also coupled to the selection circuit so that the switching operation is effected in accordance therewith. Also included in the focusing apparatus is a timing delay circuit coupled to the switch device so that the generation of the second drive signal is interrupted for a predetermined time period after the switching operation is effected between the automatic focuse mode and manual command focuse mode. This ensures the prevention of production of an undesired image on the switching operation.

REFERENCES:
patent: 4422746 (1983-12-01), Meguro et al.
patent: 4556907 (1985-12-01), Urata et al.
patent: 4572643 (1986-02-01), Akashi

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