Optical pick-up apparatus

Details Optical pick-up apparatus Optical pick-up apparatus

2007-03-27

2007-03-27

Edun, Muhammad (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S044370, C369S044120

Reexamination Certificate

active

10647054

ABSTRACT:
An object of the invention is to provide a structure for suppressing occurrence of a track offset in a tracking control using DPP method, and simplified apparatus assembly adjustment. When a diffraction grating provided in an optical pick-up apparatus, diffracts light irradiated from a semiconductor laser at least into zero-order diffraction light and ± first-order diffraction light, disposed adjacent to diffraction area alternately in an extension direction of a grating groove, and an effective diameter of light beam with which the diffraction grating is irradiated is D, and a number of divisions into which the effective diameter D is divided is m (m is an integer of 3 or more), a width W1and a width W2are formed to meet W1=W2=D/m.

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patent: 2002-100063 (2002-04-01), None

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