Optical head apparatus

Details Optical head apparatus Optical head apparatus

Filed on

2008-05-13

Date issued

2008-05-13

Examiner

Tran, Thang V. (Department: 2627)

Patent Class

Dynamic information storage or retrieval

SubClass

With servo positioning of transducer assembly over track...

SubSubClass

Optical servo system

Other Related Categories

C369S044240, C369S118000

Type

Reexamination Certificate

Status

active

Patent number

07372784

Description

ABSTRACT:
The present invention proposes an optical head apparatus provided with light-blocking structure that can reliably prevent nonessential light from reaching the photo detector, without being an impediment to miniaturization and flattening, moreover, without increasing manufacturing cost. In an optical head apparatus, and in a lens holder, light-blocking section is provided that blocks nonessential light from passing outside the effective diameter of objective lens. This light-blocking section is constructed so that it extends only in tracking direction T of objective lens5. Further, light-blocking face of light-blocking section slants at an angle of 1° or more toward the face orthogonal to the optical axis, consequently, nonessential light is reflected in a direction other than the direction of photo detector.

REFERENCES:
patent: 4517666 (1985-05-01), Ando
patent: 5664957 (1997-09-01), Starr
patent: 5844879 (1998-12-01), Morita et al.
patent: 6660986 (2003-12-01), Matsumoto et al.
patent: 7099245 (2006-08-01), Yumiba et al.
patent: 02-157810 (1990-06-01), None
JP 2000-306260 Translation Feb. 11, 2000 NakaJima Junsaku.
Patent Abstracts of Japan, Publication No. 2002-306260 published Nov. 2, 2000 (Optocal Pickup—Sharp Corp.).

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