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Optical information recording medium, optical information recording and reproducing apparatus, and position control method

A technology for recording media and optical information, applied in optical recording/reproducing/erasing methods, optical record carriers, recording/reproducing/erasing using optical interference patterns, etc., can solve the problem of difficult detection of reflected light beams and relative positions Or the relative angle is difficult to get correct control and other issues

Inactive Publication Date: 2008-10-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, since the direction of the beam reflected by the servo point changes with the relative angle between the beam and the holographic disc, it is difficult to detect the reflected beam
As a result, the relative position or relative angle between the laser beam and the holographic disc is difficult to control correctly

Method used

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  • Optical information recording medium, optical information recording and reproducing apparatus, and position control method
  • Optical information recording medium, optical information recording and reproducing apparatus, and position control method
  • Optical information recording medium, optical information recording and reproducing apparatus, and position control method

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Embodiment Construction

[0038] Exemplary embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

[0039] figure 1 It is a schematic diagram of a holographic disc 100 as an optical information recording medium according to the first embodiment of the present invention. Information may be recorded in the holographic disc 100 as a hologram, which is a light and dark fringe pattern produced by the interference phenomenon between the information beam and the reference beam.

[0040] The holographic optical disc 100 includes a hologram recording layer 102 sandwiched between substrates 101,103. A film layer 104 is stacked on the substrate 103 . The film layer 104 has a plurality of openings 105 (hereinafter referred to as "pinholes"). The laser beam can pass through the pinhole 105 but cannot pass through the thin film layer 104 .

[0041] The substrates 101, 103 are made of light-transmitting materials such as glass, polycarbonate, or acryli...

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Abstract

An optical information recording medium includes a recording layer in which information can be recorded as a hologram by using a phenomenon of interference between an information light beam and a reference light beam. The recording layer is sandwiched between substrates. A thin film layer that is laminated on the substrate on light output side. Openings are formed in the recording layer and those openings allow passage of the information light beam and the reference light beam.

Description

[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2007-82617 filed on March 27, 2007, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a technique for recording / reproducing optical information as a hologram with respect to a recording medium. Background technique [0004] Various methods are used to increase the recording density of optical information recording media such as compact discs (CD) or digital multimedia discs (DVD). Examples of these methods are generating a laser beam with a shorter wavelength, or enlarging the numerical aperture (NA) of the objective lens. However, it is difficult to increase the recording density with conventional techniques, and it is necessary to develop other techniques for increasing the recording density. [0005] One of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/0065
CPCG11B7/24053G11B7/0938G11B7/0065G11B7/0908G11B7/1369G11B7/24044
Inventor 立田真一山本雄一郎久保田裕二
Owner KK TOSHIBA