Optical head

Details Optical head Optical head

1994-11-21

1997-03-18

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369107, 369109, 369116, 369100, G11B 700

Patent

active

056129424

ABSTRACT:
A light radiated from a light source is focused to provide a light spot on an optical disc. A central portion of the radiated light is shielded, and a peripheral portion of the radiated light is modulated to have an intensity decreasing in an outer periphery direction, respectively, by a light intensity modulator. Consequently, a diameter of the light spot is reduced, and side-lobes are suppressed. In place of the light intensity modulator, a light source filter and a second filter are used. A secondary light source is formed by focusing the radiated light. At a point of the secondary light source, the light source filter having a central portion of 0% and a peripheral portion of 100%, respectively, in light transmission intensity is provided. On an output side of a collimator lens, the second filter having central portion of 100% and a peripheral portion of 0%, respectively, in light transmission intensity is provided.

REFERENCES:
patent: 4868807 (1989-09-01), Okada et al.
patent: 5010541 (1991-04-01), Takeuchi
patent: 5122903 (1992-06-01), Aoyama et al.
patent: 5172369 (1992-12-01), Chikuma et al.
patent: 5245596 (1993-09-01), Gupta et al.
patent: 5247510 (1993-09-01), Lee et al.
patent: 5313441 (1994-05-01), Imai et al.
patent: 5349592 (1994-09-01), Ando 369112

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