EP0159785A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording & reproducing apparatus
Assignee: Toshiba Corp
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Filing: 1985-03-06
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Granted: —
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Expires: 2005-03-06
Abstract
Abstract An optical recording and reproducing apparatus with a first light source for generating a recording laser beam, a second light source for generating a reproducing beam which has a shorter wavelength than that of the recording laser beam. Information is recorded by forming pits on a recoding member by the recording laser beam, and reproduced by directing the reproducing laser beam onto the pits and obtaining the beam reflected beam from the pits.
Inventors
- 👤 Chiaki C/O Patent Division Nago
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 10:53
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B7/00; G11B7/004; G11B7/08; G11B7/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
An optical recording and reproducing apparatus comprising; first light source means (10) for generating a recording laser beam; second light source means (9) for generating a reproducing laser beam which has a shorter wavelength than that of the beam generated from said first light source; and optical means (13 - 18) arranged to direct the beam from said first source onto a recording member (1) to form pits to record information, to direct the beam from said second light source onto said pits and to detect the reflection beam from the pits so as to reproduce the recorded information.
Claim 2
Dependent Claim
99 words
An optical recording and reproducing apparatus comprising; first light source means (10) for generating a recording laser beam; second light source means (9) for generating a reproducing laser beam which has a shorter wavelength than that of the beam generated from said first light source; and optical means (13 - 18) arranged to direct the beam from said first source onto a recording member (1) to form pits to record information, to direct the beam from said second light source onto said pits and to detect the reflection beam from the pits so as to reproduce the recorded information.
Claim 3
Dependent Claim
28 words
An optical recording and reproducing apparatus according to claim 1, further including a housing (8) for mounting said first light source means and said second light source means.
Claim 4
Dependent Claim
50 words
An optical recording and reproducing apparatus according to claim 1, wherein said optical means directs the laser beam from said second light source to a position forward along the data recording direction on the recording member from the position where the laser beam from said first light source is directed.
References Cited (Backward Citations)
No citation records indexed.
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