Information recording medium having substrate with microscopic pattern and reproducing apparatus therefor
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0008405
(2004-12-10)
|
우선권정보 |
JP-2001-134954(2001-05-02); JP-2002-125978(2002-04-26) |
발명자
/ 주소 |
- Kondo,Tetsuya
- Nishizawa,Akira
|
출원인 / 주소 |
- Victor Company Of Japan, Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
6 |
초록
▼
A recording medium includes a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate. A recording layer is formed on the micros
A recording medium includes a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate. A recording layer is formed on the microscopic pattern and a light transmitting layer has a thickness of 0.05 mm to 0.12 mm formed on the recording layer. The microscopic pattern satisfies a relation of P≦λ/NA, wherein P is a pitch of the convex shaped section, λ is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens. The microscopic pattern also includes modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, and furthermore wherein the address information is modulated by the phase-shift keying modulation system. A reproducing apparatus is particularly suited for the recording medium.
대표청구항
▼
The invention claimed is: 1. An information recording medium comprising: a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substr
The invention claimed is: 1. An information recording medium comprising: a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate; a recording layer formed on the microscopic pattern; and a light transmitting layer having thickness of 0.05 mm to 0. 12 mm formed on the recording layer, the microscopic pattern satisfies a relation of P≦λ/NA, wherein P is a pitch of the convex shaped section, λ is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens, and further wherein the microscopic pattern includes a modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, and furthermore wherein the address information is modulated by the phase-shift keying modulation system. 2. An information recording medium comprising: a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate; a recording layer formed on the microscopic pattern; and a light transmitting layer having thickness of 0.05 mm to 0. 12 mm formed on the recording layer, the microscopic pattern satisfies a relation of P≦λ/NA, wherein P is a pitch of the convex shaped section, λ is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens, and further wherein the microscopic pattern includes a modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, and furthermore wherein the convex shaped section is formed by the constant angular velocity (CAV) method. 3. A reproducing apparatus for reproducing an information recording medium comprising: a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate; a recording layer fanned on the microscopic pattern; and a light transmitting layer having thickness of 0.05 mm to 0. 12 mm formed on the recording layer, the microscopic pattern satisfies a relation of P≦λ/NA, wherein P is a pitch of the convex shaped section, λ is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens, and further wherein the microscopic pattern includes a modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, the reproducing apparatus comprising: a light emitting element for emitting a reproducing light beam having the wavelength λ; an objective lens having the numerical aperture NA; and an optical pickup having at least a photo detector, wherein the objective lens is mounted in the reproducing apparatus so as to confront the light transmitting layer of the information recording medium. 4. The reproducing apparatus in accordance wit claim 3, further comprising a demodulator for demodulating a reproduced signal of the information recording medium outputted from the optical pickup.
이 특허에 인용된 특허 (6)
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Okanishi Toshiharu,JPX, Data recording apparatus and method.
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Kondo, Tetsuya; Nishizawa, Akira, Information recording medium having parallel grooves with alternating convex-concave sections.
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Kobayashi Shoei,JPX, Optical disk with a groove for defining serial data modulated into a signal using modulation processing.
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Horie Michikazu,JPX ; Ohno Takashi,JPX ; Kubo Hideyuki,JPX ; Kubo Masae,JPX ; Mizuno Hironobu,JPX ; Mizuno Masaaki,JPX ; Kunitomo Haruo,JPX ; Takada Ken-Ichi,JPX, Optical phase-change disc.
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Yamagami Tamotsu,JPX ; Takeda Toru,JPX ; Kobayashi Shoei,JPX ; Ogihara Koichiro,JPX, Optical recording medium and recording method thereof.
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Seo Katsuhiro,JPX, Optical recording medium, and method of manufacturing optical recording medium.
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