Optical head

Details Optical head Optical head

1995-06-06

1996-08-13

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369110, 369116, 369 4414, G11B 700

Patent

active

055463711

ABSTRACT:
The optical head includes a light source, a reflection mirror for bending the light flux from the light source to an information recording medium, an outward and inward path light separating element for separating an outward path light incident on the recording medium through the reflection mirror and an inward path light reflected on the recording medium, an objective lens for condensing the outward path light on the recording medium, a semiconductor substrate having a semiconductor crystal layer with inclined surfaces and plane surfaces adjacent to the inclined surface, and at least one pair of photodiodes embedded in the inclined surface and the plane surface, respectively. The inward path light emanated from the outward and inward path light separating element is incident on one of these photodiodes, thereby photo-electrically converting the incident light into electrical signals. The inward path light reflected on the one photodiode is incident on the other of the photodiodes, thereby photo-electrically converting the incident light into electrical signals, resulting in acquisition of information signals and servo signals based on these photoelectrically converted signals.

REFERENCES:
patent: 5247506 (1993-09-01), Sugiura
patent: 5283771 (1994-02-01), Kadowaki et al.
patent: 5313441 (1994-05-01), Imai et al.
patent: 5396061 (1995-03-01), Taniguchi et al.
patent: 5406543 (1995-04-01), Kobayashi
patent: 5410468 (1995-04-01), Horimouchi
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5465247 (1995-11-01), Kobayashi
Katayama, et al., "Compact Optical Module Integrated with Chip Elements for Magneto-Optical Disks", 28a-SF-11, Extended Abstracts (The 54th Autumn Meeting, 1993); The Japan Society of Applied Physics, p. 1008.
Ohba, et al., "Prismless Optical Head of Magneto-Optical Disk Using Polarizing Holographic Optical Element", 28a-SF-12, Extended Abstracts (The 54th Autumn Meeting, 1993); The Japan Society of Applied Physics, p. 1008.

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