Reproducing device and reproducing method

A reproducing device and a technology for reproducing images, applied in the directions of optical recording/reproducing/erasing methods, digital recording/reproducing, recording/reproducing with optical methods, etc., can solve problems such as noise, reduce manufacturing costs, and reproduce signal quality Improved, high-speed reproduction and delivery of effects

Inactive Publication Date: 2010-09-08
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0054] In addition, in the "differential detection method", the problem of noise existing in the "coherent accumulation method" can be solved, but when the "differential detection method" is used, there will be the following problems

Method used

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  • Reproducing device and reproducing method
  • Reproducing device and reproducing method
  • Reproducing device and reproducing method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0093] [1-1. Configuration of Recording and Reproducing Device]

[0094] [1-2. Linear reading technique of the first embodiment]

[0095] [1-3. Setting of linear reading]

[0096] [1-4. Summary of the first embodiment]

no. 2 example

[0098]

[0099]

[0100] [1-1. Configuration of Recording and Reproducing Device]

[0101] figure 1 is a view showing the internal structure of a hologram recording and reproducing device as an embodiment of the reproducing device of the present invention. Hereinafter, the hologram recording and reproducing device is simply referred to as a recording and reproducing device.

[0102] exist figure 1 Among them, the hologram recording medium HM is a recording medium on which information recording is performed by interference fringes of signal light and reference light.

[0103] The holographic recording medium HM is selected as a recording material such as a photosensitive polymer, which can perform information recording by changing the refractive index according to the intensity distribution of the reference light, thereby realizing information recording through the interference fringes of the signal light and the reference light. Furthermore, the hologram recording med...

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Abstract

A reproducing device including a light source that emits light for reproducing recorded information to a hologram recording medium subjected to recording of information by interference fringes of signal light and reference light, a light irradiating unit that generates the reference light for obtaining a reproduced image according to the recorded information and DC light having uniform intensity and phase, and irradiates the hologram recording medium with both the reference light and the DC light and with only the DC light, a light receiving unit that performs light-reception for the DC light and the reproduced image, and performs light-reception for the DC light, and a difference calculating unit that calculates a difference between an image signal obtained based on a light-reception result of the reproduced image and the DC light, and an image signal obtained based on a light-reception result of the DC light.

Description

technical field [0001] The present invention relates to a reproducing device and method for reproducing a holographic recording medium. Background technique [0002] For example, as disclosed in Japanese Unexamined Patent Application Publication Nos. 2006-107663, 2008-152827, and 2008-310924, there is known a holographic recording and reproducing method that records data by utilizing interference fringes of signal light and reference light, And the data recorded by the interference fringes is reproduced by irradiation of the reference light. As a hologram recording and reproducing method, there is known a so-called coaxial method, which performs recording by arranging signal light and reference light on the same axis. [0003] [High density recording by phase modulation] [0004] Figure 17 , Figure 18A and Figure 18B It is a view for explaining the technique of holographic recording and reproduction by the coaxial method, Figure 17 shows the recording technique, whil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065
CPCG03H1/16G11B2220/2504G03H2225/60G03H2225/32G11B7/083G11B7/0065G11B20/10009G03H2225/36
Inventor 福本敦田中健二原雅明山川明郎
Owner SONY CORP
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