Optical systems employing ovate light beams

Details Optical systems employing ovate light beams Optical systems employing ovate light beams

1985-03-18

1986-09-02

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01T 120, G11B 509

Patent

active

046098135

ABSTRACT:
An optical system, preferably used in an optical data recorder, has a laser light source emitting a light beam having an ovate or elliptical cross-section. An astigmatic optical element, such as a hemicylinder or cylindrical lens, disposed at 45 degrees with respect to the major axis, also termed the beam ellipse axis, in front of a focus detector eliminates focus offset errors caused by beam ellipticity.

REFERENCES:
patent: 4293944 (1981-10-01), Izumita et al.
patent: 4368526 (1983-01-01), Harigae et al.

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