Method of saving power for video camera

Details Method of saving power for video camera Method of saving power for video camera

1995-11-14

1998-01-20

Faile, Andrew

Television

Camera, system and detail

Power supply

358906, H04N 5225

Patent

active

057105979

ABSTRACT:
A video camera having a taking lens of multiple focal lengths is provided with a separate, multiple focal length view finder lens. When power has been supplied to the camera via the "on" switch but a switch for video recording has not yet been closed, the focal length of the view finder is automatically made to coincide with the focal length of the taking lens so as permit the scene to be viewed in the same frame size as it will appear when recording, but without wasting power by supplying power to those circuits of the taking lens that form electrical signals of the scene or that record the scene. In addition, in a preferred embodiment of the invention, six different power level consumption states are provided so as to supply power only to the minimum circuitry required for each state.

REFERENCES:
patent: 4161002 (1979-07-01), Saito
patent: 4700255 (1987-10-01), Mitsuhashi
patent: 4750056 (1988-06-01), Ogawa
patent: 4945424 (1990-07-01), Hiroki
patent: 5060069 (1991-10-01), Aoki
patent: 5063458 (1991-11-01), Fukushima et al.
patent: 5142379 (1992-08-01), Jung et al.
patent: 5313305 (1994-05-01), Harigaya et al.
patent: 5412425 (1995-05-01), Nagano

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