Focus control apparatus

Details Focus control apparatus Focus control apparatus

G - Physics

02

B

350/40, 95/53.4

G02B 7/28 (2006.01) H04N 5/335 (2006.01)

Patent

CA 1339786

A method of focus control for a video camera comprises the steps of detecting the maximum value of a luminance component in an image pickup signal; and adjusting a rotating position of a focusing ring of an image pickup lens on the basis of the result of the detection, including the further steps, when said maximum value is detected, of rotating said focusing ring for driving same at a low speed for a predetermined time to discriminate an increasing direction of the luminance component from a start point and, thereafter, until said luminance component exceeds a predetermined level, rotating the focusing ring at a high speed, and rotating the focusing ring at a low speed when said level is set to at least the predetermined level, thereby permitting faster focusing and reducing the amount of overrun of the lens during such focusing.

616749

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