Patent US5689495A successfully refreshed from Google Patents.
US5689495A
Expired / Lapsed
US
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High density optical disc and optical disc player
Assignee: Sanyo Electric Co Ltd
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Filing: 1996-09-09
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Granted: 1997-11-18
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Expires: 2016-09-09
Abstract
Abstract An optical disc having a track pitch of 0.85 μm, a shortest pit length of 0.49 μm, a pit depth of 100 nm, and a pit width of 0.35 μm is rotated at a linear velocity of 2.4-2.8 m/s such that the same is optically reproduced by a laser beam having a wavelength of 635 nm which is converged to a spot size of 0.9 μm by an objective lens having a numerical aperture of 0.6, Accordingly, data is read from the optical disc at a transfer rate of 5.6 Mbps.
Inventors
- 👤 Yoichi Tsuchiya
- 👤 Hitoshi Terasaki
- 👤 Shuichi Ichiura
- 👤 Toshio Ito
- 👤 Yasuyuki Kano
- 👤 Yoshimoto Yamaguchi
- 👤 Seizo Kato
- 👤 Osamu Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:46
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B19/00; G11B19/20; G11B19/26; G11B7/004; G11B7/005; G11B7/12; G11B7/125; G11B7/127; G11B7/135; G11B7/1372; G11B7/1374; G11B7/24073; G11B7/24079; G11B2007/13727; G11B7/002; G11B7/0037
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
105 words
An optical disc player for reproducing an information signal from one of an optical disc format and an optical disc having a track pitch of 0.7-0.85 μm, a pit width of 0.20-0.35 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; irradiating means for irradiating a beam from said semiconductor laser onto said optical disc with a spot size of 0.85-0.95 μm; detecting means for detecting reflected light from said optical disc; and photo-electric conversion means for converting said detected reflected light into an electric signal and outputting said electrical signal as said information signal.
Claim 2
Dependent Claim
105 words
An optical disc player for reproducing an information signal from one of an optical disc format and an optical disc having a track pitch of 0.7-0.85 μm, a pit width of 0.20-0.35 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; irradiating means for irradiating a beam from said semiconductor laser onto said optical disc with a spot size of 0.85-0.95 μm; detecting means for detecting reflected light from said optical disc; and photo-electric conversion means for converting said detected reflected light into an electric signal and outputting said electrical signal as said information signal.
Claim 3
Dependent Claim
24 words
A disc player according to claim 1, wherein said irradiating means includes means for irradiating said beam with a spot size of 0.90 μm.
Claim 4
Dependent Claim
19 words
A disc player according to claim 1, said irradiating means includes a beam condensing means for condensing said beam.
Claim 5
Dependent Claim
23 words
A disc player according to claim 2, wherein said beam condensing means includes an objective lens having a numerical aperture of approximately 0.6.
Claim 6
Dependent Claim
23 words
A disc player according to claim 1, wherein said irradiating means includes beam condensing means for converging said beam to produce high resolution.
Claim 7
Dependent Claim
23 words
A disc player according to claim 1, further comprising motor means for rotating said optical disc at a linear velocity of 2.4-2.8 m/s.
Claim 8
Dependent Claim
105 words
An optical disc player for reproducing an information signal from one of optical disc format and an optical disc having a track pitch of 0.8-1.00 μm, a pit width of 0.20-0.35 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; an objective lens having a numerical aperture of 0.5-0.6 for irradiating a beam from said semiconductor laser onto said optical disc; and detecting means for detecting reflected light from said optical disc and photo-electric conversion means for converting said detected reflected light into an electrical signal and outputting said electrical signal as said information signal.
Claim 9
Dependent Claim
105 words
An optical disc player for reproducing an information signal from one of optical disc format and an optical disc having a track pitch of 0.8-1.00 μm, a pit width of 0.20-0.35 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; an objective lens having a numerical aperture of 0.5-0.6 for irradiating a beam from said semiconductor laser onto said optical disc; and detecting means for detecting reflected light from said optical disc and photo-electric conversion means for converting said detected reflected light into an electrical signal and outputting said electrical signal as said information signal.
Claim 10
Dependent Claim
14 words
A disc player according to claim 7, wherein said track pitch is 0.85 μm.
Claim 11
Dependent Claim
18 words
A disc player according to claim 7, wherein said wavelength of said semiconductor laser is approximately 635 nm.
Claim 12
Dependent Claim
14 words
An optical disc player according to claim 1, wherein said wavelength is 590-650 nm.
Claim 13
Dependent Claim
14 words
An optical disc player according to claim 10, wherein said wavelength is 635±15 nm.
Claim 14
Dependent Claim
99 words
An optical disc player for reproducing an information signal from one of an optical disc format and an optical disc having a track pitch of 0.7-0.85 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; an objective lens having a numerical aperture of 0.5-0.6 for irradiating a beam from said semiconductor laser onto said optical disc; detecting means for detecting reflected light from said optical disc and photo-electric conversion means for converting said detected reflected light into an electrical signal and outputting said electrical signal as said information signal.
Claim 15
Dependent Claim
99 words
An optical disc player for reproducing an information signal from one of an optical disc format and an optical disc having a track pitch of 0.7-0.85 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; an objective lens having a numerical aperture of 0.5-0.6 for irradiating a beam from said semiconductor laser onto said optical disc; detecting means for detecting reflected light from said optical disc and photo-electric conversion means for converting said detected reflected light into an electrical signal and outputting said electrical signal as said information signal.
Claim 16
Dependent Claim
14 words
An optical disc player according to claim 12, wherein said wavelength is 590-650 nm.
Claim 17
Dependent Claim
14 words
An optical disc player according to claim 13, wherein said wavelength is 635±15 nm.
Claim 18
Dependent Claim
100 words
An optical disc player for reproducing an information signal from one of an optical disc format and an optical disc having a track pitch of 0.8-1.00 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; an objective lens having a numerical aperture of 0.5-0.6 for irradiating a beam from said semiconductor laser onto said optical disc; and detecting means for detecting reflected light from said optical disc and photo-electric conversion means for converting said detected reflected light into an electrical signal and outputting said electrical signal as said information signal.
Claim 19
Dependent Claim
100 words
An optical disc player for reproducing an information signal from one of an optical disc format and an optical disc having a track pitch of 0.8-1.00 μm, and a shortest pit length of 0.42-0.49 μm, comprising: a semiconductor laser having a wavelength of 590-770 nm; an objective lens having a numerical aperture of 0.5-0.6 for irradiating a beam from said semiconductor laser onto said optical disc; and detecting means for detecting reflected light from said optical disc and photo-electric conversion means for converting said detected reflected light into an electrical signal and outputting said electrical signal as said information signal.
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