Laser pick-up

Details Laser pick-up Laser pick-up

1989-12-29

1991-05-28

Arnold, Bruce Y.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 37, 2502015, G02B 2610

Patent

active

050188046

ABSTRACT:
A laser pick-up device for an optical disk receives three laser beams to irradiate the optical disk and uses a six-division optical detector to detect the laser beams reflected from the optical disk and to track exactly the optical disk. A reflection type diffraction grating is positioned at a front position in order to divide and reflect the laser beam generated by a laser diode. A holographic element having the function of a toric lens is used as a diffracting device for the reflected beams. The six-division optical detector is positioned to one side and/or behind the diffraction grating. The grid gaps of the holographic element can be larger using the present invention which simplifies the manufacturing the holographic element and thereby provides a laser pick-up device that is suitable for mass production.

REFERENCES:
patent: 4641296 (1987-02-01), Mizunoe et al.
patent: 4784447 (1988-11-01), Latta et al.
patent: 4789977 (1988-12-01), Oudenhuysen et al.
patent: 4829506 (1989-05-01), Bressers et al.
patent: 4904856 (1990-02-01), Nagahama et al.
patent: 4907847 (1990-03-01), Onayama et al.

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