Zoom tracking apparatus and method in a video camera

Details Zoom tracking apparatus and method in a video camera Zoom tracking apparatus and method in a video camera

1995-10-05

1998-09-29

Faile, Andrew

Television

Camera, system and detail

Optics

396 81, H04N 5232

Patent

active

058152032

ABSTRACT:
A zoom tracking apparatus and method in a video camera. An offset adjustment is achieved by deriving applied voltage of the zoom position sensor only by use of data relating to positions of the zoom lens respectively associated with several optional points and corresponding positions of the focusing lens involving focusing while shifting the zoom lens in one direction. The offset adjustment is, thereby, achieved rapidly and accurately, and an accurate focus upon zoom tracking is obtained. The minimum quantity of trace data is stored in the internal ROM of the control circuit, while a trace tracking of the focusing lens associated with the shift of the zoom lens is achieved in a region where an error may occur possibly upon detecting the position of the zoom lens by use of a focusing evaluation value, thereby capable of achieving the trace tracking accurately.

REFERENCES:
patent: 4611244 (1986-09-01), Kentaro et al.
patent: 4782369 (1988-11-01), Park
patent: 5003339 (1991-03-01), Kikuchi et al.
patent: 5055932 (1991-10-01), Hijikata
patent: 5164756 (1992-11-01), Hirasawa

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