Method of auto-focussing and system therefor

Details Method of auto-focussing and system therefor Method of auto-focussing and system therefor

1993-04-22

1995-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354402, 348354, G02B 711

Patent

active

054323320

ABSTRACT:
A novel method and apparatus for auto-focussing which includes determining a focus voltage E.sub.S0 in a current position of a focus lens and focus voltages E.sub.S+ +and E.sub.S- when the focus lens is moved by a distance dx in both a front and rear direction along an optical axis, so that a focussing shift value is calculated more accurately and quick focussing is achieved. A distance X.sub.0 from the current position of the focus lens to the focussing position is calculated based on the focus voltages E.sub.S0, E.sub.S+ and E.sub.S- according to:

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The Technical Journal of NHK (Japan Broadcasting Corporation) No. 1 (Ser. 86), vol. 17, "An Example of a Focus Value Curve" 1965 pp. 21-37.
The Technical Journal of Japan Broadcasting Corporation ED675, vol. 6, No. 29, "Auto Focus System by Detecting Edge Component of Video Signal" pp. 7-12. Nov. 29, 1982.

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