Optical head having a shading slit

Details Optical head having a shading slit Optical head having a shading slit

1997-09-08

2000-04-18

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369118, G11B 712

Patent

active

060523433

ABSTRACT:
To provide an optical head having a shading slit wherein aberration characteristic is effectively improved without hindering the high-speed operation or the miniaturization thereof, an optical head has an optical system for detecting a light reflected from a micro spot of an optical disk where a laser light is converged by an object lens (4), which comprises a shading slit (3) for restricting the laser light to pass through opposite peripheries of the object lens.

REFERENCES:
patent: 5322993 (1994-06-01), Ohyama
Tsuchiya et al; "Study of Compatibility for 2 Types of Discs"; p. 956; 29a-ZA-6, in Extracted Abtracts of 56th Autumn Meeting, 1995 of JSAP.

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