Viewfinder brightness control circuit for a camcorder employing

Details Viewfinder brightness control circuit for a camcorder employing Viewfinder brightness control circuit for a camcorder employing

1994-07-14

1996-07-09

Greening, Wendy

Television

Camera, system and detail

With electronic viewfinder or display monitor

348363, H04N 5222

Patent

active

055349200

ABSTRACT:
A camcorder viewfinder brightness control circuit includes a first amplifier for amplifying a video signal corresponding to an object to a predetermined level, a second amplifier for detecting a change in an iris output voltage which varies in response to variations in ambient brightness and amplifying the iris output voltage by a predetermined ratio, and a light controller for automatically controlling the brightness of an image supplied to the viewfinder responsive to the change in ambient brightness. Preferably, the light controller adds the signal representing change in the iris output voltage output by the second amplifier to the video signal output from the first amplifier. A method for controlling a camcorder viewfinder brightness control circuit is also described.

REFERENCES:
patent: 4355334 (1982-01-01), Fitzgibbon et al.
patent: 4589022 (1986-05-01), Prince et al.
patent: 4649431 (1987-03-01), Terashi
patent: 5270818 (1993-12-01), Ottenstein
patent: 5282075 (1994-01-01), Sugimori

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