Optical pickup appratus, recording/reproducing apparatus...

Details Optical pickup appratus, recording/reproducing apparatus... Optical pickup appratus, recording/reproducing apparatus...

2005-09-27

2005-09-27

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112020, C369S044230, C369S044340, C369S094000, C369S053300, C369S112010, C359S719000, C359S566000, C359S721000, C359S742000

Reexamination Certificate

active

06950384

ABSTRACT:
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source for emitting first light flux having a first wavelength; a second light source for emitting second light flux having a second wavelength, the first wavelength being different from the second wavelength; a converging optical system having an optical axis and a diffractive portion, and a photo detector; wherein in case that the first light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the first light flux is greater than that of any other ordered diffracted ray of the first light flux, and in case that the second light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the second light flux is greater than that of any other ordered diffracted ray of the second light flux, where n stands for an integer other than zero.

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