Optical focussing and tracking system using a polarization prism

Details Optical focussing and tracking system using a polarization prism Optical focussing and tracking system using a polarization prism

1984-12-14

1987-08-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G11B 509, G11B 2022

Patent

active

046894799

ABSTRACT:
This invention is characterized in that a modified polarization prism or a modified half prism is used therein. Since photodetectors serving at the same time for light signal detection, for automatic focussing and for tracking are disposed at opposite sides of the optical source of a semiconductor laser, a single axis optical system can be realized and it is possible to reduce the optical head in size.

REFERENCES:
patent: 4150399 (1979-04-01), Boonstra
patent: 4555780 (1985-11-01), Kiode
patent: 4585933 (1986-04-01), Ando

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