High-density optical disk with a polymer film featuring thermochromism

a polymer film and optical disk technology, applied in the field of high-density (hd) optical disks, can solve the problems of inability to make the beam size, inability to achieve the size of the beam, and inability to achieve effective solutions for situations such as this exampl

Inactive Publication Date: 2003-06-12
LG ELECTRONICS INC +1
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Benefits of technology

0017] According to another aspect of the present invention, the polymer film refracts the incident light beam and allows the formation of a Gaussian beam spot at a light intensity between about 10 kW/cm.sup.2 and 20 kW/cm.sup.2.
0018] The disk medium described below is used with a recording and reproduction apparatus. Such apparatus comprises a light source that provides an incident light beam on the disk medium. In part

Problems solved by technology

Thus the signal reproduction resolution and density of recorded information are limited to the size of a beam spot at the focal position.
However, it is not possible to make the size of the beam spot, which is focused on the recording layer 11 of the optical disk, to be smaller than the wavelength of the laser beam because of optical restri

Method used

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  • High-density optical disk with a polymer film featuring thermochromism
  • High-density optical disk with a polymer film featuring thermochromism
  • High-density optical disk with a polymer film featuring thermochromism

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Embodiment Construction

[0027] In order that the invention may be fully understood, a preferred embodiment thereof will now be described with reference to the accompanying drawings.

[0028] FIG. 1 shows a schematic structure of a conventional optical disk which has a transmission layer 10 as a substrate, a reflection layer 11 formed above the transmission layer 10, and a protective layer 12 coated onto the reflection layer 11. FIG. 2 shows schematic structure of a HD optical disk according to the present invention. The optical disk of FIG. 2 is the same as the conventional one of FIG. 1, except a nonlinear polymer film 20, which exhibits self-focusing and optical bleaching properties, is formed below the transmission layer 10. Consequently, a recording layer can support pits and / or spaces situated more closely together for recorded signals than those in a conventional HD optical disk.

[0029] The third-order optical nonlinearity of the polymer film 20 induces light-intensity-dependent optical constants, i.e., ...

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Abstract

The present invention relates to a high-density optical disk having thin film layer made from a thermochromic polymer with a red-shift which exhibits self-focusing and optical bleaching. After an incident light beam passes through the polymer medium, not only can the spot size of the beam be reduced but also transmittance can be enhanced due to these kinds of third-order nonlinear optical response. Thus, a high-density disk structured according to the present invention is capable of the signal reproduction resolution beyond the diffraction limit with an efficient reflectivity. Accordingly, data recording density of a high-density disk can be improved greatly.

Description

CROSS REFERENCE TO RELATED ART[0001] This application claims the benefit of Korean Patent Application No. 2001-63491, filed on Oct. 15, 2001, which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002] 1. Field of the Invention[0003] The present invention relates to a high-density (HD) optical disk having a thin film layer made from a thermochromic polymer with a red-shift which exhibits self-focusing and optical bleaching.[0004] 2. Description of the Related Art[0005] In general, information signals in an optical disk such as a compact disk (CD) or a digital versatile disk (DVD) is recorded and reproduced with a laser beam incident thereto. The optical disk is classified into two types, one for a read-only optical disk such as a CD or DVD for read only memory (CD-ROM or DVD-ROM), and the other for a rewritable optical disk such as a rewritable CD (CD-R / W) or a DVD for random access memory (DVD-RAM).[0006] FIG. 1 shows a schematic structure of a conve...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B7/24G11B7/245
CPCB82Y10/00G11B7/00G11B7/24Y10T428/21Y10S428/913Y10S430/146G11B7/252Y10T428/31906Y10T428/31928
Inventor RHEE, BUM KUPARK, KYUNG CHANKIM, JIN YONG
Owner LG ELECTRONICS INC
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