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Focus servo method, optical reproducing method, and optical reproducing apparatus

A focus servo and reproduction device technology, applied in the directions of recording/reproducing/erasing using optical interference patterns, recording/reproducing with optical methods, optical recording/reproducing/erasing methods, etc., can solve the difficulty of beam tracking, Signal degradation and other issues

Inactive Publication Date: 2009-09-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the signal is degraded, and the follow-up (follow-up) of the light beam with respect to the recording / reproducing position becomes difficult

Method used

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  • Focus servo method, optical reproducing method, and optical reproducing apparatus
  • Focus servo method, optical reproducing method, and optical reproducing apparatus
  • Focus servo method, optical reproducing method, and optical reproducing apparatus

Examples

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Embodiment Construction

[0050] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0051] figure 1 is a view showing the configuration of the optical system of the optical recording / reproducing device 1 according to the embodiment of the present invention.

[0052] Such as figure 1 As shown, the optical system of the optical recording / reproducing apparatus 1 includes a laser source 2, a focusing lens 3, a beam splitter 4, mirrors 5 and 6, objective lenses 7 and 8, objective lens actuators 9 and 10, a reflecting mirror 11, a light Path length adjustment mirror 12 , mirror 13 , focusing lens 14 , photodetector 15 , laser source 16 , mirrors 17 and 18 , focusing lens 19 , photodetector 21 and objective lens focusing servo 22 .

[0053] For example, laser source 2 emits blue laser light L1 with a wavelength of about 405 nm to focusing lens 3 .

[0054] The focusing lens 3 makes the blue laser light L1 emitted from the laser light source 2 ...

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Abstract

The present invention provides a focus servo method which includes: causing light to enter an objective lens at an eccentric position; irradiating light onto recording marks of an optical recording medium in an oblique direction with respect to a thickness direction of the optical recording medium; detecting light reflected by the recording marks as a reflection of the light irradiated onto the recording marks; and controlling a position of the objective lens based on the detected light.

Description

[0001] Cross References to Related Applications [0002] The present application contains subject matter related to Japanese Patent Application JP 2008-081456 filed in the Japan Patent Office on Mar. 26, 2008, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a focus servo method, an optical reproducing method, and an optical reproducing apparatus used when reproducing information recorded on a recording medium. Background technique [0004] An optical disc for recording a standing wave on a recording medium has been proposed as a next-generation optical disc for currently used CD (Compact Disc), DVD (Digital Versatile Disc), and Blu-ray Disc. [0005] For example, light is once focused on a recording medium whose refractive index changes with the intensity of irradiated light, and is then refocused in the reverse direction on the same focus position using a reflector provided on the back of the optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/0065
CPCG11B7/00781G11B7/0908G11B7/083G11B7/1275G11B7/0938
Inventor 上田大辅
Owner SONY CORP