Holographic disk scanner having special position-indicating holo

Details Holographic disk scanner having special position-indicating holo Holographic disk scanner having special position-indicating holo

1987-01-12

1988-07-19

Arnold, Bruce Y.

Registers

Coded record sensors

Particular sensor structure

235457, 235466, G02B 2610

Patent

active

047580585

ABSTRACT:
A holographic scanner includes a rotating glass disk carrying a plurality of scan line generating holograms, a laser light source and means for detecting reflected optical energy. The scanner is improved by adding a plurality of relatively small position-indicating holograms in alternation with the scan line generating holograms. The position-indicating holograms redirect the laser beam along desired paths on the same side of the disk as the laser. The redirected laser beam may be detected by the system photodetector or an auxiliary photodetector to provide signals indicating the current disk position. The position information can be used by a system processor to optimize scanner parameters as a function of the characteristics of the next active scan line generating hologram.

REFERENCES:
patent: 3636317 (1972-01-01), Torrey
patent: 4415224 (1983-11-01), Dickson
patent: 4548463 (1985-10-01), Cato et al.
patent: 4591242 (1986-05-01), Broockman et al.
patent: 4678263 (1987-07-01), Funato
Wolfheimer, "Holographic Disc Test Apparatus," IBM Technical Disclosure Bulletin, vol. 25, No. 11B, Apr. 1983, pp. 6280-6281.
Dickson et al, "Holographic Disc," IBM Technical Disclosure Bulletin, vol. 27, No. 2, Jul. 1984, p. 959.
Broockman, "Time Multiplexed Two-Beam Scanner," IBM Technical Disclosure Bulletin, vol. 24, No. 9, Feb. 1982, pp. 4841-4843.

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