Auto focussing method and device

Details Auto focussing method and device Auto focussing method and device

1997-08-01

1998-05-12

Metjahic, Safet

Photography

Having variable focal length of camera objective

Power zoom

396 87, 396 78, G03B 1336

Patent

active

057520984

ABSTRACT:
A zoom optical system (25) is associated with an image sensor (46), which is disposed behind the zoom optical system for picking up an object (6). The zoom optical system is focussed by use of a photoelectric signal from the image sensor. In a setup mode, the zoom optical system is zoomed from a first magnification to a preset magnification. The zoom optical system has been set at the first magnification. The preset magnification is adapted to focussing. The zoom optical system is focussed in accordance with the photoelectric signal generated while the zoom optical system has the preset magnification. The zoom optical system is zoomed back from the preset magnification to the first magnification, while keeping the zoom optical system in-focus. The zoom optical system becomes in-focus at the first magnification in a manner in which the zoom optical system is in-focus at the preset magnification.

REFERENCES:
patent: 4935763 (1990-06-01), Itoh et al.
patent: 4942417 (1990-07-01), Miyazawa et al.
patent: 4974003 (1990-11-01), Ohnuki et al.
patent: 4994842 (1991-02-01), Itoh et al.
patent: 5200860 (1993-04-01), Hirasawa et al.
patent: 5486860 (1996-01-01), Shiokawa et al.
patent: 5537174 (1996-07-01), Ishikawa

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