Optical lens device and production method thereof

Details Optical lens device and production method thereof Optical lens device and production method thereof

2006-06-06

2006-06-06

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S494010

Reexamination Certificate

active

07057817

ABSTRACT:
The present invention provides an optical lens device capable of providing an optical pickup with a stable performance by restraining the influence of the birefringence even in the case of using a plurality of resin lenses. In the optical lens device having two lenses, by disposing the two lenses relative to each other such that the birefringence directions of the lenses form a predetermined angle, preferably 180 degrees, the influence of the birefringence can be reduced as a whole and an optical lens device with a good characteristic can be obtained.

REFERENCES:
patent: 3686480 (1972-08-01), Bowerman
patent: 4247190 (1981-01-01), Hashimoto et al.
patent: 4981342 (1991-01-01), Fiala
patent: 6618200 (2003-09-01), Shimizu et al.
IBM Technical Disclosure Bulletin, “Method For Aligning The Axes of a Birefringent Bifocal Lens System,” vol. 27, No. 11, Apr. 1985, pp. 6674-6675.

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