Optical pickup and optical device for three different types...

Details Optical pickup and optical device for three different types... Optical pickup and optical device for three different types...

2011-07-26

2011-07-26

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112030

Reexamination Certificate

active

07986595

ABSTRACT:
An optical pickup for performing recording and/or playback of information by selectively irradiating the corresponding wavelength optical beam to first through third optical discs having a protection layer with different thickness, includes emission units for emitting first-wavelength through third-wavelength optical beams corresponding to the respective optical discs respectively, a condensing optical device for condensing each wavelength optical beam on an optical disc signal recording face, a divergence angle transformation device, which can be moved in the optical axis direction, for transforming the divergence angle of each wavelength optical beam according to the moved position in the optical axis direction so as to obtain a predetermined divergence angle, and a detector having a common light receiving unit for receiving each wavelength optical beam separated by an optical path separating unit and returned, with the condensing optical device condensing each wavelength optical beam on the corresponding optical disc signal recording face appropriately.

REFERENCES:
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patent: 2004/0213131 (2004-10-01), Kimura et al.
patent: 2005/0180294 (2005-08-01), Kimura et al.
patent: 2006/0126673 (2006-06-01), Nagatomi et al.
patent: 2007/0242591 (2007-10-01), Ikenaka
patent: 2007-220215 (2007-08-01), None
patent: WO 2005119668 (2005-12-01), None

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