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Title:
OPTICAL PICKUP
Document Type and Number:
Japanese Patent JP2006012303
Kind Code:
A
Abstract:

To provide an optical pickup which improves power reduction of a laser beam by using a two wavelength monolithic laser diode, can perform successful recording and reproduction and also attain cost reduction of an optical system.

A laser for DVD is emitted from the two-wavelength monolithic laser diode 1, dispersed into a main beam and two sub-beams by a two wavelength one side diffraction element 2, passes a polarization beam splitter 3 and with which a recording surface of an optical disk is irradiated through a predetermined element. The direction of major axis of an ellipse which shows each optical spot of a main beam and two sub beams for a DVD becomes slanting to the direction of tracking on the optical disk. The return light from the optical disk is incident to a polarization beam splitter 3 through a prescribed optical element and reflected, further converged with a cylindrical lens 4, incident to a light receiving section for a DVD of a light receiving face of a photo detector 5, changed into an electrical signal as a reproducing signal of the DVD.


Inventors:
Nakamura, Yoki
Application Number:
JP2004000188654
Publication Date:
January 12, 2006
Filing Date:
June 25, 2004
Export Citation:
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Assignee:
FUNAI ELECTRIC CO LTD
International Classes:
G11B7/135; G11B7/09; G11B7/125; H01J40/14; G11B7/00



 
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