Optical pickup device

Details Optical pickup device Optical pickup device

1999-04-27

2000-09-05

Lee, John R

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359565, 369112, G02B 300, G11B 712

Patent

active

061146897

ABSTRACT:
An optical pickup device includes a light module, emitting light and receiving light reflected from a recording medium, and a solid immersion lens (SIL) member disposed in an optical path between the light module and the recording medium. The SIL has a planar surface facing the recording medium and a plurality of elliptically curved surfaces opposite the recording medium. The elliptically curved surfaces have different radii of curvature arranged symmetrical with respect to a central axis for focusing the incident light to form a tight beam spot on a recording plane of the recording medium.

REFERENCES:
patent: 5125750 (1992-06-01), Corle et al.
patent: 5422870 (1995-06-01), Kojima et al.
patent: 5883872 (1999-03-01), Kino
patent: 5917788 (1999-06-01), Mowry
patent: 5930434 (1999-07-01), Mowry
patent: 5946281 (1999-08-01), Ito et al.
patent: 5978139 (1999-11-01), Hatakoshi et al.
Bass (Editor in Chief): "Handbook of Optics, vol. 2 (Devices, Measurement & Properties)" 1995, McGraw-Hill, New York, USA p. 7.18, paragraph 7.9 and p. 7.21, figure 22.

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