Lens device including a light controlling mechanism and an...

Details Lens device including a light controlling mechanism and an... Lens device including a light controlling mechanism and an...

2006-03-21

2006-03-21

Stafira, Michael P. (Department: 2877)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S721000

Reissue Patent

active

RE039025

ABSTRACT:
A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam, thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.

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