Optical pickup head

Details Optical pickup head Optical pickup head

1992-04-16

1994-04-05

Hannaher, Constantine

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, 369 4423, 369112, G11B 700

Patent

active

053011821

ABSTRACT:
An optical pickup head for operating on an information recording medium includes a light source for emitting a light beam. A transparent base plate has opposite surfaces formed with a semitransparent film and a hologram respectively. The semitransparent film is exposed to the light beam emitted from the light source, and reflects a portion of the light beam emitted from the light source. The portion of the light beam which is reflected by the semitransparent film forms a forward light beam. A condenser optical system serves to focus the forward light beam on the information recording medium. The forward light beam is reflected at the information recording medium, and forms a backward light beam. The backward light beam successively passes through the condenser optical system, the semitransparent film, and the transparent base plate, and then reaches the hologram. The hologram generates a backward +1-order diffraction light beam from the backward light beam. A plurality of photodetectors serve to receive the +1-order diffraction light beam and to convert the received +1-order diffraction light beam into corresponding electric signals respectively.

REFERENCES:
patent: 3911230 (1975-10-01), Neidell
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4823335 (1989-04-01), Shikama et al.
patent: 4929823 (1990-05-01), Kato et al.
patent: 5101389 (1992-03-01), Ohuchida et al.
patent: 5185731 (1993-02-01), Takahashi
"New Small Optical Pickup For Laserdisc (1)" by H. Kanamaru et al., ITEC'90, pp. 145-146.
"New Small Optical Pickup For Laserdisc (2)" by H. Kanamaru et al., ITEC'90, pp. 147-148.

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