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Optical information recording medium and production method therefor

A technology for recording media and optical information, used in optical recording/reproducing, optics, data recording, etc., can solve the problems of low signal light quantity, high power loss, weakening of electronic noise, etc., and achieve excellent anti-reflection function. Effect

Inactive Publication Date: 2013-10-09
SONY CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Further, although an optical pickup of eight-times-speed recording / reproducing technology is studied for BD (for example, refer to Non-Patent Document 1), the surface reflection of the magnetic disk causes loss from high power required for high-speed recording and reproduction at the time of high-speed reproduction loss of semaphores, these are major failures
[0008] 2. Problems on the disc side
Although multi-layer structured disks (for example, 25GB / layer×8-layer 200G and 25GB / layer×16-layer 400G) are released and actively researched for future capacity expansion of BD, the reflectivity of each layer in more layers is natural becomes lower, and the amount of signal light also becomes less, so there is a major problem that the amount of light is attenuated by about 5% on the disk surface
The reduction in the amount of signal light causes the signal to be weakened by electronic noise in the detector of the reproduced signal of the above-mentioned optical pickup and thus a read error occurs

Method used

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  • Optical information recording medium and production method therefor
  • Optical information recording medium and production method therefor
  • Optical information recording medium and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

no. 3 approach

[0098] 3. Third Embodiment (Example of Press-bonded Optical Information Recording Medium)

[0099] 4. Fourth Embodiment (First Example of Optical Information Recording Medium Having Two Information Signal Layers)

[0100] 5. Fifth Embodiment (Second Example of Optical Information Recording Medium Having Two Information Signal Layers)

[0101] 6. Sixth Embodiment (First Example in which Structures are Formed in Reading Surface of Optical Information Recording Medium)

[0102]7. Seventh Embodiment (Second Example in which Structures are Formed in Reading Surface of Optical Information Recording Medium)

[0103] 8. Eighth embodiment (first example of optical information recording medium in which the protective layer side is the reading surface)

[0104] 9. Ninth Embodiment (Second Example of Optical Information Recording Medium Where the Protective Layer Side Is the Reading Surface)

[0105] 10. Tenth embodiment (example in which structures are aligned in a square grid pattern...

no. 1 approach

[0110] [Structure of Optical Information Recording Medium]

[0111] figure 1 is a sectional view showing an example of the configuration of the optical information recording medium according to the first embodiment of the present invention. This optical information recording medium has a substrate 1 , an information signal layer 2 formed on the substrate 1 , and a protective layer 3 formed on the information signal layer 2 . In the reading surface of the optical information recording medium on which laser light is irradiated, a plurality of sub-wavelength structures (hereinafter also simply referred to as “structures”) having a convex shape are formed. Meanwhile, the read surface refers to a surface on which an information signal is recorded and / or reproduced by being irradiated with laser light.

[0112] In the optical information recording medium according to the first embodiment, an information signal is recorded or reproduced by irradiating laser light to the information...

no. 2 approach

[0202] Figure 11 is a process diagram for explaining an example of the manufacturing method of the optical information recording medium according to the second embodiment of the present invention. The second embodiment of the present invention differs from the first embodiment in that the substrate 1 is formed by laminating the first molded body 1a and the second molded body 1b. In addition, parts of the second embodiment corresponding to those of the first embodiment will be assigned the same reference numerals.

[0203] (transfer process)

[0204] First, if Figure 11 As shown in A, a read surface forming master 201 is prepared. Then, if Figure 11 As shown in B, the shape of the reading surface forming master 201 is transferred to the resin material 13 according to, for example, an injection molding method. In this way, as Figure 11 As shown in C, a first formed body 1a having a plurality of structures 11 formed in one main face thereof and a flat surface formed in ...

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Abstract

An optical information recording medium has: a substrate; one, two or more information signal layers which is formed on the substrate; and a protective layer which is formed on the one, two or more information signal layers. The surface of the protective layer is a reading surface on which light for recording or playing back an information signal in the information signal layer is radiated, and, in the reading surface, a plurality of subwavelength structures is formed.

Description

technical field [0001] The present invention relates to an optical information recording medium and a method of manufacturing the same. More specifically, the present invention relates to an optical information recording medium having an antireflection function on the surface. Background technique [0002] Optical discs have advantages of easy handling, ease of mass production, and low manufacturing cost, and thus are popular as recording media for recording video images and music. Although optical discs are recording media for recording and reproducing information signals by irradiating and reflecting light with an optical drive device, (1) problems on the drive device side and (2) problems on the optical disc side are conventionally pointed out below. [0003] 1. Problems on the drive (player) optical pickup side [0004] The surface reflectance of optical resin materials such as polycarbonate generally used for optical discs is about 5% of the entire visible light range...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24056G02B5/02
CPCG02B5/0215G11B7/24053G11B7/24056G11B7/24038G11B7/24047G11B7/263
Inventor 峰岸慎治远藤惣铭林部和弥
Owner SONY CORP
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