Optical head in a recording and reading device for a data carrie

Details Optical head in a recording and reading device for a data carrie Optical head in a recording and reading device for a data carrie

1983-02-22

1985-09-17

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369112, 369122, G11B 712

Patent

active

045424926

ABSTRACT:
The optical head in a data carrier recording-reading device comprises a semiconductor laser source. A lens makes it possible to focus the beam from this source. A polarization beam splitter makes it possible to deflect the beam reflected by this carrier towards a group of photodetectors. According to the invention the splitter is an isosceles prism, which serves as an anamorphotic-splitting means. A quarter-wave plate is bonded to one of the faces of the prism. A planoconvex lens can also be bonded to the other face of the prism upstream of the photodetector.

REFERENCES:
patent: 4065786 (1977-12-01), Stewart
patent: 4203652 (1980-05-01), Hanada
patent: 4333173 (1982-01-01), Yonezawa et al.
patent: 4334300 (1982-06-01), Arquie et al.
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4387452 (1983-06-01), Bricot et al.
patent: 4482803 (1984-11-01), Lacotte et al.
Elektronik, vol. 27, No. 15, Dec. 1978, Munich(DE), "1010 Bit auf Einer Platte Optisch Gespeichert", pp. 31-34.

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