Optical pickup system having multiple diffraction devices and le

Details Optical pickup system having multiple diffraction devices and le Optical pickup system having multiple diffraction devices and le

1989-03-17

1990-04-17

Nelm, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 46, G01J 120

Patent

active

049183001

ABSTRACT:
An optical pickup device for reading signal pits on a disk includes a light source, first and second diffraction devices, a first holding member for holding a photosensor and a hollow second holding member for holding an object lens, wherein the first holding member may be rotated inside the second holding member. It is therefore possible to adjust the alignment direction of three light spots projected on an optical disk.

REFERENCES:
patent: 4473746 (1984-09-01), Edmonds
patent: 4654519 (1987-03-01), Ando

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