Non-parallax optical auto-focusing system and method

Details Non-parallax optical auto-focusing system and method Non-parallax optical auto-focusing system and method

2006-01-03

2006-01-03

Lee, Diane I. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S462230, C235S462350

Reexamination Certificate

active

06981642

ABSTRACT:
A non-parallax optical auto-focusing system focuses an image and determines a distance to an optical target without being prone to errors due to parallax. The system includes a first beam splitter, a second beam splitter, and a lens positioned therebetween on an optical axis. An aiming beam is directed towards an optical target and the redirected reflected beam is received by a quadrant sensor assembly for generating an output signal indicative of a parameter of the redirected reflected aiming beam. A processor receives the output signal and generates a control signal for actuating an actuator to reposition the lens. The system continues to position the lens until the measured parameter is within a predetermined range for optimally focusing the optical target on an image sensor. The distance to the optical target is determined by using a look-up table to correlate the measured parameter to the distance to the optical target.

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patent: 6276606 (2001-08-01), Liou et al.
patent: 6677565 (2004-01-01), Wahl et al.
patent: 6713718 (2004-03-01), Lu
International Search Report.

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