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Recording medium, method of initializing the same, initializing device, and reproducing method

An initialization method and a technology for recording media, applied in optical recording/reproduction/erasing methods, data recording, recording/reproduction/erasing using optical interference patterns, etc., can solve the problem of increased size and complexity of optical systems or drive systems issues such as

Inactive Publication Date: 2012-05-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method, it is necessary to provide an optical system on both the front and back surfaces of a recording medium such as an optical disc, and therefore, there is a disadvantage of an increase in size and complexity of the entire optical system or drive system.

Method used

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  • Recording medium, method of initializing the same, initializing device, and reproducing method
  • Recording medium, method of initializing the same, initializing device, and reproducing method
  • Recording medium, method of initializing the same, initializing device, and reproducing method

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Embodiment Construction

[0031] Hereinafter, preferred embodiments of the present invention will be described in the following order.

[0032] 1. Initialization and recording

[0033] 2. Recording / reproducing device

[0034] 3. The relationship between initialization wavelength, interference pattern pitch and regeneration wavelength

[0035] 4. Example of another initialization device

[0036] (1. Initialization and recording)

[0037] In an embodiment of the present invention, an interference pattern is formed on a recording medium which is a holographic optical disc as initialization processing (preformatting). When recording information, one surface of the initialized holographic disc is irradiated with converging light to erase or change the interference pattern, thereby performing mark recording.

[0038] will refer to figure 1 A configuration example of the initialization device 10 of the embodiment for performing initialization processing is described. exist figure 1 Among them, for exam...

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Abstract

There is provided a method of initializing a recording medium having a first surface and a second surface which face to each other with a recording layer in between. The method includes forming interference patterns to have a pitch wider than [lambda]r / 2N by applying initializing light of a plane wave with a wavelength [lambda]f to the recording layer from both of the first surface side and the second surface side, where [lambda]r is a wavelength of reproducing light applied to the recording layer at the time of reproducing recorded information, and N is an average refractive index of the recording layer.

Description

technical field [0001] The present invention relates to a recording medium including a recording layer, a method of initializing the same, an initializing device, and a reproducing method, wherein an interference pattern formed parallel to a surface of the recording medium is erased or changed by irradiating a part of the interference pattern with converging light, to Information is recorded to the recording medium, and the recorded information is reproduced from the recording medium using reflected light with respect to irradiation of the convergent light. Background technique [0002] In formats such as compact disc (CD), digital versatile disc (DVD) and Blu-ray disc (BD) In ​​an optical disc system, a slight change in reflectivity formed on one surface of an optical disc is read in a non-contact manner similar to a microscope objective. As is well known, the spot size on an optical disc is basically given by λ / NA (λ: wavelength of irradiating light, NA: numerical apertu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065G11B7/24044G11B7/2407G11B7/24085
CPCG11B7/268G11B7/24044
Inventor 齐藤公博小林诚司角洋次郎
Owner SONY CORP
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