Optical system used for writing optical head |
Title： |
| Optical system used for writing optical head |
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Application Number： |
200710075394 |
Application Date： |
2007/08/02 |
Announcement Date： |
2008/01/23 |
Pub. Date： |
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Publication Number： |
101110233 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
94[China|shenzhen] |
IPC： |
G11B 7/135 |
Applicant(s)： |
Graduate School At Shenzhen Tsinghua University |
Inventor(s)： |
Cheng Xuemin, Ma Jianshe, Yan Shuang, Mao Leshan, Sun Manlong, Yang Mingsheng, Pan Longfa, Zhang Buqing, Wang Shuoshi |
Key Words： |
Optical system, writing, optical head |
Abstract： |
The invention discloses an optical system for inscribing an optical head, which belongs to the technical field of optical storage. The invention comprises a first laser generator, a second laser generator, a grating, a polarization light division unit, an optical signal collection module and a photoelectric signal pickup module. A light beam generated from the first laser generator and the second laser generator reaches to the polarization light division unit to form a P polarized light via the grating; the P polarized light reaches a compact disc via the optical signal collection module; a compact disc reflection light reaches to the polarization light division unit via the optical signal collection module; the polarized light from the polarization light division unit reaches to the optical signal pickup module. The invention is characterized in that: the grating is arranged as an array grating. Besides, because a plurality of array gratings are positioned in front of the two laser generators, the invention is able to track the signal channel, inhibit the side lobe of focusing facula and enhance the central strength, thus improving the reading quality information symbol in compact disc and reducing the noise. |
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