An astigmatic focusing system with optical elements oriented to

Details An astigmatic focusing system with optical elements oriented to An astigmatic focusing system with optical elements oriented to

1986-07-08

1988-03-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

047315270

ABSTRACT:
An optical pickup for astigmatic focusing on an optical disk. A planar beam splitter reflects light from a source through an objective lens to the recording track of the disk. The light reflected from the disk is transmitted through the beam splitter. The beam splitter is inclined to the optical axis so that astigmatism is produced on transmission. A cylindrical lens is placed along the path of the transmitted light and is oriented so that the combined astigmatism is aligned with a quadruple element detector.

REFERENCES:
patent: 4079247 (1978-03-01), Bricot et al.
patent: 4163149 (1979-07-01), Sawano et al.
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4525625 (1985-06-01), Abe
patent: 4561080 (1985-12-01), Yamazaki
patent: 4614863 (1986-09-01), Sato
patent: 4625303 (1986-11-01), Shikama et al.

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