Flat type optical head for focusing a light beam onto an optical

Details Flat type optical head for focusing a light beam onto an optical Flat type optical head for focusing a light beam onto an optical

1988-03-09

1989-08-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 44, G01J 120

Patent

active

048577197

ABSTRACT:
In a flat type optical head for focusing a light beam, a semiconductor laser is mounted on a mount which is fixed on a base. A Fresnel lens structure is formed on optical detecting layer which is formed on the base. A laser beam generated from the semiconductor layer is incident on a converging layer of the Fresnel lens structure and is conveyed on an optical disk by the converging layer. The laser beam reflected from the optical disk is returned to the conveying layer. A part of the laser beam passes through the converging layer and is detected by the optical detecting layer.

REFERENCES:
patent: 4085423 (1978-04-01), Tsunoda et al.
patent: 4216357 (1980-08-01), Iwasaki et al.

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