Auto-focus device

Details Auto-focus device Auto-focus device

1997-05-14

2000-06-13

Britton, Howard

Television

Special applications

Microscope

350510, 350516, 350331, 396 89, 250311, H04N 718

Patent

active

06075558&

ABSTRACT:
In an auto-focus apparatus having an object lens 14 which condenses light on an object surface to be measured, a CCD camera 24 observing the object's image based on emitting light from the object lens 14, and an actuator 15 which displaces the object lens 14 along the optical axis based on the contrast of the object image obtained with the CCD camera 24, the auto-focus apparatus includes an illuminator 25, a projection lens 21 and a liquid crystal panel 22 on which a designated pattern is displayed and further includes a pattern projection means 20 which projects the designated pattern on the object surface to be measured.

REFERENCES:
patent: 4561731 (1985-12-01), Kley
patent: 4918953 (1990-04-01), Newman
patent: 4935612 (1990-06-01), Bierleutgeb
patent: 4945220 (1990-07-01), Mallory et al.
patent: 5056177 (1991-10-01), Nast
patent: 5081354 (1992-01-01), Ohhashi et al.
patent: 5577950 (1996-11-01), Smith et al.
patent: 5604344 (1997-02-01), Finarov

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