Optical pickup for CD/DVD compatible player

Details Optical pickup for CD/DVD compatible player Optical pickup for CD/DVD compatible player

2005-07-05

2005-07-05

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

06914869

ABSTRACT:
A monolithic double-wavelength semiconductor laser diode is provided in a DVD/CD compatible player to suppress deterioration in the optical characteristics of a reading light spot. A laser diode is a monolithic element which has two light emitting points on a single substrate for emitting two different laser beams having different wavelengths with each other. A central line of a main laser beam for use in reproducing DVDs is positioned closer to the optical axis Y of an optical system than a central line of a laser beam for use in reproducing CDs. In another arrangement, the central line of a main laser beam for use in reproducing DVDs is positioned so as to be coincident with the optical axis Y of the optical system.

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Abstract of JP 10-261240 (Sep. 29, 1998), Patent Abstract of Japan, vol. 1998, No. 14.
Yamada, M. et al., “DVD/CD/CD-R Compatible Pick-Up with Two-Wavelength Two-Beam Laser” IEEE Transactions on Consumer Electronics, IEEE Inc. New York, U.S., vol. 44, No. 3, pp. 591-600 (Aug. 1998).

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