Title:
OBJECTIVE LENS FOR OPTICAL PICKUP
Document Type and Number:
Japanese Patent JP2003005059
Kind Code:
A
Abstract:
To provide a high-performance and small objective lens for an optical pickup securing a working distance while having large numerical apertures.
The objective lens for the optical pickup that carries out read/ write of information by condensing luminous flux from a light source on an information recording medium comprises two lenses consisting of a first lens having a convex first surface on the light source side and a second surface concave on the light source side, and a second lens having a third surface convex on the light source side and a fourth surface flat on the light source side, this order from the light source side. The second surface has an aspherical surface.
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Inventors:
HASHIMURA JUNJI
TAKADA TAMA
OSADA HIDEKI
TAKADA TAMA
OSADA HIDEKI
Application Number:
JP2001193992A
Publication Date:
January 08, 2003
Filing Date:
June 27, 2001
Export Citation:
Assignee:
MINOLTA CO LTD
International Classes:
G02B13/00; G02B13/18; G11B7/135; (IPC1-7): G02B13/00; G02B13/18; G11B7/135