Objective lens, and method of manufacturing the same and...

Details Objective lens, and method of manufacturing the same and... Objective lens, and method of manufacturing the same and...

2011-03-01

2011-03-01

Edun, Muhammad N (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S044230, C369S044120

Reexamination Certificate

active

07898929

ABSTRACT:
An objective lens formed of a synthetic resin material having characteristics of substantially not reducing transmittance of the objective lens when a first laser beam having a first wavelength passes through the objective lens, and reducing the transmittance according to an elapsed time to apply a second laser beam when the second laser beam having a second wavelength shorter than the first wavelength and longer than a wavelength of ultraviolet light passes through the objective lens, the objective lens being irradiated with the ultraviolet light in advance for a predetermined time such that a change in the transmittance for the second laser beam is set within a predetermined range.

REFERENCES:
patent: 7019280 (2006-03-01), Kokubo et al.
patent: 2001/0028514 (2001-10-01), Asoma
patent: 2002/0060974 (2002-05-01), Murata et al.
patent: 2005-338684 (2005-12-01), None

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