Optical pickup head with holographic servo signal detection usin

Details Optical pickup head with holographic servo signal detection usin Optical pickup head with holographic servo signal detection usin

1988-10-04

1990-05-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

049298232

ABSTRACT:
An optical pickup head apparatus comprises a hologram element disposed in the flux of light reflected back from an optical disc, and first and second photodetectors respectively having linear element boundaries extending in a predetermined direction and disposed so as to receive two-focal-point images on their coplanar detection surfaces, whereby the tolerable width of variation in the light source wavelength and the tolerable range of error in the assembling adjustment of the optics can be extended considerably to permit stable differential signal detection.

REFERENCES:
patent: 4525625 (1985-06-01), Abe
patent: 4665310 (1987-05-01), Heemskerk
patent: 4731772 (1988-03-01), Lee
patent: 4771411 (1988-09-01), Greve
patent: 4789977 (1988-12-01), Oudenhuysen et al.
Y. Kimura et al., "High Performance Optical Head Using Optimized Holographic Optical Element" Proc. of the International Simposium on Optical Memory, Tokyo, Sep. 16-18, 1987, p. 131.
K. Tatsumi et al., "A Multi-Functional Refection Type Gratinglens for the CD Optical Head", Proc. of the International Simposium on Optical Memory, Tokyo, Sep. 16-18, 1987, p. 127.
"Speckle Reduction in Holography . . . " M. Kato et al. (Appl. Opt.), vol. 14 (1975).
U.S. Pat. No. 4,358,200.

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