Autofocus control device with a light source

Details Autofocus control device with a light source Autofocus control device with a light source

1996-02-09

1997-10-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502014, 356400, 355 55, G02B 704, G02B 2764

Patent

active

056751400

ABSTRACT:
An optical positioning device using astigmatic optical elements. A laser diode emits astigmatic, elliptically shaped light which is not corrected. A first lens condenses the light and transmits the light to an object to be positioned. The light reflected off of the object is monitored while the object is moved. Because of astigmatism, the first lens does not have a true focal point. There is a point, however, where the vertical and horizontal components of the transmitted light are equal. The first lens is positioned so that the desired position of the object corresponds to this equal point.

REFERENCES:
patent: 4687322 (1987-08-01), Tanimoto et al.
patent: 4701606 (1987-10-01), Tanimoto et al.
patent: 5286963 (1994-02-01), Torigoe
patent: 5483056 (1996-01-01), Imai
patent: 5489966 (1996-02-01), Kawashima et al.

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