US5272689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical head system with transparent contact member
Assignee: Sanyo Electric Co Ltd
•
Filing: 1989-10-10
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Granted: 1993-12-21
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Expires: 2009-10-10
Abstract
Abstract An optical head device for projecting a light beam on a recording medium to record data thereon or reproduce the recorded data comprises an optical system for forming a beam spot of a specified diameter on the surface of the recording medium, and a transparent contact member disposed at a light emanating portion of the system for the recording medium to come into direct sliding contact therewith. Accordingly, when the contact member moves relative to the recording medium, the dust adhering to the surface of medium is removed by the contact member to assure a recording or reproduction operation free of errors.
Inventors
- 👤 Tsuyoshi Tsujioka
- 👤 Shigeaki Yamamoto
- 👤 Fumio Tatezono
- 👤 Minoru Kume
- 👤 Kotaro Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:25
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/002; G11B7/003; G11B7/0031
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
An optical head device for projecting a light beam on a recording medium to record data thereon or reproduce the recorded data, the device being characterized in that the device comprises an optical system for forming at least one beam spot of a specified diameter on the surface of the recording medium, a transparent contact member disposed at a light emanating portion of the optical system for the recording medium to come into direct sliding contact therewith, said transparent contact member being disposed on a guide surface for guiding movement of the recording medium relative to the optical system, said transparent contact member projecting slightly from the guide surface, the transparent contact member having a beam incident face, and a reflection preventing film for inhibiting reflection of the light beam being formed on the beam incident face of the transparent contact member.
Claim 2
Dependent Claim
142 words
An optical head device for projecting a light beam on a recording medium to record data thereon or reproduce the recorded data, the device being characterized in that the device comprises an optical system for forming at least one beam spot of a specified diameter on the surface of the recording medium, a transparent contact member disposed at a light emanating portion of the optical system for the recording medium to come into direct sliding contact therewith, said transparent contact member being disposed on a guide surface for guiding movement of the recording medium relative to the optical system, said transparent contact member projecting slightly from the guide surface, the transparent contact member having a beam incident face, and a reflection preventing film for inhibiting reflection of the light beam being formed on the beam incident face of the transparent contact member.
Claim 3
Dependent Claim
120 words
An optical head device for projecting a light beam on a recording medium to record data thereon of produce the recorded data, the device characterized in that the device comprises an optical system for forming at least one beam spot of a specified diameter on the surface of the recording medium, a transparent contact member being disposed at a light emanating portion of the optical system for the recording medium to come into direct sliding contact therewith, said transparent contact member being disposed on a guide surface for guiding movement of the recording medium relative to the optical system, said transparent contact member projecting slightly from the guide surface, the transparent contact member being formed of a non-linear optical material.
Claim 4
Dependent Claim
120 words
An optical head device for projecting a light beam on a recording medium to record data thereon of produce the recorded data, the device characterized in that the device comprises an optical system for forming at least one beam spot of a specified diameter on the surface of the recording medium, a transparent contact member being disposed at a light emanating portion of the optical system for the recording medium to come into direct sliding contact therewith, said transparent contact member being disposed on a guide surface for guiding movement of the recording medium relative to the optical system, said transparent contact member projecting slightly from the guide surface, the transparent contact member being formed of a non-linear optical material.
References Cited (Backward Citations)
US4023033A
Cited
US3980811A
Cited
US4293944A
Cited
JPS5337722A
Cited
JPS5339123A
Cited
US4551827A
Cited
JPS5712188A
Cited
JPS57205834A
Cited
JPS6030017A
Cited
EP0156453A1
Cited
US4812016A
Cited
JPS61240445A
Cited
JPS61273745A
Cited
JPS628339A
Cited
JPS62109233A
Cited
EP0263656A2
Cited
JPS63122021A
Cited
US4886959A
Cited
US4970707A
Cited
US4998239A
Cited
US4907846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-20 | 1997-06-21 | 1997-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-20 | 2001-06-21 | 2001-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-20 | 2005-06-21 | 2005-12-21 | $7700.00 | Window Closed / Lapsed |