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Optical pick-up and/or recording device

A technology for optical pickup and recording equipment, which is applied to optical recording heads, optical recording/reproducing, data recording, etc. high sex effect

Inactive Publication Date: 2008-07-09
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of the known near-field systems is that the alignment of the lens relative to the disc surface requires tedious trial and error
It takes a lot of effort and takes a lot of time

Method used

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  • Optical pick-up and/or recording device
  • Optical pick-up and/or recording device
  • Optical pick-up and/or recording device

Examples

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Embodiment Construction

[0019] Fig. 1 shows an optical pickup and / or recording device 1 according to a first embodiment of the invention. The optical pickup and / or recording apparatus 1 according to the first embodiment of the present invention includes an optical head. Some elements of the optical pickup and / or recording device 1 as claimed may also be located not on the optical head but elsewhere in the optical storage system, eg on the motherboard.

[0020] The optical pickup and / or recording device 1 can be used in optical storage systems, in particular for two-dimensional optical data storage as well as three-dimensional holographic storage. The optical storage system may use a two-dimensional optical data storage disk, a storage medium for a holographic memory, or another optical storage medium. However, the optical head and the optical pick-up and / or recording device 1 are not limited to the described data storage system, which can also be used in other applications.

[0021] As shown in FIG...

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Abstract

For optical data storage applications a near field optical system can be used. In near field optical systems an accurate control of the distance between the solid immersion lens and the disc surface is crucial. After the correction of a tilt between the lens and the disc, the laser beam may not always be parallel to the optical axis. This has a detrimental effect on the gap signal used for the distance control. The optical head of the invention comprises a gap signal correcting unit to take care of such detrimental effects.

Description

field of invention [0001] The invention relates to an optical head for a near-field optical storage system and to an optical pickup and / or recording system. In particular the invention relates to an optical head for two-dimensional optical data storage and an optical pick-up and / or recording device. Background technique [0002] F. Zijp et al. describe a near-field system in the state-of-the-art document "Optical Data Storage 2004" published in "Proceedings of SPIE" vol. 5380, pp. 209-233. From this, a near-field readout of a 50GB first surface disk with a very high numerical aperture of 1.9 was proposed. Known near-field systems comprise a movement mechanism adapted to vary the distance between the front surface of the solid immersion lens and one surface of the optical disc. Therefore, for readout operations, the solid immersion lens is placed at a constant distance within the rapidly decaying distance of a fraction of the focused electromagnetic field, typically less th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/135
CPCG11B7/0956G11B7/0908G11B7/1387G11B7/09G11B7/085
Inventor F·齐普C·A·弗舒伦
Owner KONINK PHILIPS ELECTRONICS NV