Coupling lens, optical head and optical disc device

Details Coupling lens, optical head and optical disc device Coupling lens, optical head and optical disc device

2011-05-31

2011-05-31

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07952979

ABSTRACT:
Provides a coupling lens which, when used in combination with an objective lens for a plurality of types of optical discs such as a high density disc, DVD, CD or the like, is capable of compensating for various types of aberrations including those caused by wavelength changes and thus providing good recording or reproduction characteristics with a good wavelength dispersion compensation ability; and an optical head and an optical disc apparatus (drive).A coupling lens is incorporated into an optical head for collecting laser light emitted from a plurality of light sources and having different wavelengths on an information recording face of different types of optical information recording mediums respectively. The coupling lens comprises a first lens and a second lens which are substantially in close contact with each other such that optical axes thereof match each other and designed such that the laser light having different wavelengths are refracted by the close contact face. The coupling lens is afocal for the shortest wavelength among the different wavelengths of the laser light.

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International Search Report for corresponding Application No. PCT/JP2007/062124 mailed Jun. 19, 2007.

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