Objective lens and optical head device

Details Objective lens and optical head device Objective lens and optical head device

2000-07-27

2009-11-10

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S708000, C359S718000, C359S710000, C369S112200

Reissue Patent

active

RE040954

ABSTRACT:
An objective lens (1) for an optical disk, which focuses a light beam from a light source, is designed so that a third-order coma aberration generated when the objective lens is inclined at a unit angle is larger than a third-order coma aberration generated when the optical disk (2) is inclined at the unit angle, mounted on an actuator for inclining the objective lens according to an inclination amount of the optical disk, and used. With this structure, it is possible to obtain an objective lens for an optical disk that has a large numerical aperture and is easy to manufacture and assemble, and in which the third-order coma aberration generated when the optical disk surface is inclined owing to a warp or the like can be corrected by small inclination of the objective lens, so as to reduce a residual astigmatism, which is generated according to the inclination amount, after the correction.

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Dec. 12, 2000 International Search Report for PCT/JP00/05040.

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