Lens, optical pickup device, and method for detecting lens...

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

Reexamination Certificate

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C359S719000

Reexamination Certificate

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06999400

ABSTRACT:
A lens includes a plane surface whose normal direction virtually conforms to an optical axis direction, and a reflecting part is provided on the plane surface to reflect only light within a predetermined waveband. Consequently, inclination of the lens can be detected with high accuracy.

REFERENCES:
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patent: 5875167 (1999-02-01), Katayama
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patent: 05-006561 (1993-01-01), None
patent: 6-59172 (1994-03-01), None
patent: 10-116438 (1998-05-01), None
patent: 10-255304 (1998-09-01), None
patent: 2000-019304 (2000-01-01), None
patent: 2000-227545 (2000-08-01), None
Japanese Patent Office Action with English translation.
Tokukaihei 10-116438, dated May 6, 1998.

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