Objective lens and optical pickup device

Details Objective lens and optical pickup device Objective lens and optical pickup device

2011-03-01

2011-03-01

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S112110

Reexamination Certificate

active

07898928

ABSTRACT:
To provide an objective lens and an optical pickup device which can thin the objective lens and a device on which the objective lens is mounted, and which can prevent that the pitch of the diffraction grating at the outer periphery of the objective lens becomes too small in the manufacturing procedure and so it becomes difficult to manufacture the Fresnel lens or which does not require a high-grade fine processing technique in order to minimize the pitch of the diffraction grating, in an objective lens which condenses a laser light emitted from a light source to irradiate on an optical disk, the outer periphery on the side surface of the objective lens in which the laser light is incident is formed by a refractive lens portion7aand the inner periphery thereof is formed by a Fresnel lens portion7b.

REFERENCES:
patent: 6363037 (2002-03-01), Yamazaki
patent: 6449095 (2002-09-01), Ohtaki et al.
patent: 2002/0012313 (2002-01-01), Kimura et al.
patent: 2003/0095492 (2003-05-01), Nishino et al.
patent: 2003/0227858 (2003-12-01), Komma
patent: 2004/0160885 (2004-08-01), Kimura
patent: 2005/0047312 (2005-03-01), Yamanaka et al.
patent: 2006/0109773 (2006-05-01), Katsuma et al.
patent: 2007/0127348 (2007-06-01), Ooi et al.
patent: 2001-160223 (2001-06-01), None

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