Optical head for focusing a light beam on an optical disk

Details Optical head for focusing a light beam on an optical disk Optical head for focusing a light beam on an optical disk

1985-06-07

1987-12-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, 369 46, G01J 120

Patent

active

047162830

ABSTRACT:
In an optical head for focusing a light beam on an optical disk, a collimated laser beam is focused on the optical disk by an objective lens and is reflected from the optical disk. The reflected laser beam is directed to the prism through the objective lens and is refracted by the prism so that a beam width of the laser beam emerged from the prism is reduced. Part of the laser beam emerged from the prism is shielded by a shield plate and the other part of the laser beam is directed to a photodetector for detecting a focusing state of the objective lens.

REFERENCES:
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4378491 (1983-03-01), Lehman
patent: 4390781 (1983-06-01), Musha
patent: 4542492 (1985-09-01), Leterme et al.

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