Optical pick-up, optical disk apparatus and information...

Details Optical pick-up, optical disk apparatus and information... Optical pick-up, optical disk apparatus and information...

2005-08-09

2005-08-09

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044420, C369S112050

Reexamination Certificate

active

06928035

ABSTRACT:
An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of methods, that is, the phase difference method, the PP method, and the 3-beam method, which are necessary to record and reproduce information. The optical pick-up is formed by integrating laser light sources having two kinds of wavelengths (λ1, λ2) for detecting TE signals; photodetectors, and hologram for generating the diffracted light for detecting signals. The distance d1between the center of the photo detecting portion PD0and the light emitting spot of the first semiconductor laser light source and a distance d2between the center of the photo detecting portion PD0and the light emitting spot of the second semiconductor laser light source substantially satisfy the following relationship:in-line-formulae description="In-line Formulae" end="lead"?λ1/λ2=d1/d2.in-line-formulae description="In-line Formulae" end="tail"?

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