Optical recording head capable of correcting spherical...

Details Optical recording head capable of correcting spherical... Optical recording head capable of correcting spherical...

2006-07-18

2006-07-18

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112230

Reexamination Certificate

active

07079456

ABSTRACT:
An optical element having a high capture efficiency and rim intensity is provided. The optical element includes a central axis, a first curved surface extending in the transverse direction with respect to the central axis, a second curved surface extending in the transverse direction with respect to the central axis, and a peripheral surface extending between the first curved surface and the second curved surface. Light is refracted from the time light is incident on the first curved surface to the time the light is emitted from the second curved surface. Thereby, a light intensity distribution of the light emitted from the second curved surface and a light intensity distribution of the light incident on the first curved surface are different from each other, and a rim intensity improvement rate R, which is a rate of the rim intensity of the emitted light with respect to the rim intensity of the incident light is 1.07 or more and 1.5 or less, in which the rim intensity represents a ratio of the central intensity to the peripheral intensity.

REFERENCES:
patent: 6115336 (2000-09-01), Okada
patent: 6201229 (2001-03-01), Tawa et al.
patent: 6498330 (2002-12-01), Yoshida
patent: 6781945 (2004-08-01), Ogata
patent: 10-334575 (1998-12-01), None
patent: 11-258544 (1999-09-01), None
patent: 2000-171346 (2000-06-01), None

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