Device for optically scanning an information plane detecting bor

Details Device for optically scanning an information plane detecting bor Device for optically scanning an information plane detecting bor

1991-06-21

1992-09-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4423, G05B 100

Patent

active

051441314

ABSTRACT:
An optical scanning device for scanning an information plane (2) having tracks is described, which device comprises a radiation source (4) supplying a scanning beam (3) and an objective system (5) for focusing the scanning beam to a scanning spot on the information plane (2). To obtain two tracking spots, two grating parts located at both sides of the scanning beam and capturing border rays from the radiation source are used.

REFERENCES:
patent: 4835378 (1989-05-01), Coops
patent: 4864118 (1989-09-01), Opheij et al.
patent: 4924079 (1990-05-01), Opheij et al.
patent: 4929823 (1990-05-01), Kato et al.
patent: 4983017 (1991-01-01), Tsuji et al.

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