Invention Grant
- Patent Title: Coupling lens, optical head and optical disc device
- Patent Title (中): 耦合透镜,光头和光盘装置
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Application No.: US12305784Application Date: 2007-06-15
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Publication No.: US07952979B2Publication Date: 2011-05-31
- Inventor: Fumitomo Yamasaki , Sadao Mizuno , Katsuhiko Hayashi , Hideki Aikoh
- Applicant: Fumitomo Yamasaki , Sadao Mizuno , Katsuhiko Hayashi , Hideki Aikoh
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Renner, Otto, Boisselle & Sklar, LLP
- Priority: JP2006-170013 20060620
- International Application: PCT/JP2007/062124 WO 20070615
- International Announcement: WO2007/148625 WO 20071227
- Main IPC: G11B7/135
- IPC: G11B7/135

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.
Public/Granted literature
- US20100002560A1 COUPLING LENS, OPTICAL HEAD AND OPTICAL DISC DEVICE Public/Granted day:2010-01-07
Information query
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