US4425023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam spot scanning device
Assignee: Canon Inc
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Filing: 1981-01-27
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Granted: 1984-01-10
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Expires: 2001-01-27
Abstract
Abstract A device for scanning a beam spot. The device has a light deflecting portion and a light condensing thin film lens formed on a thin film waveguide path. In this device, a chirped signal is applied to a surface elastic wave transducer constituting the light deflecting portion, whereby scanning of the beam spot is effected on or near the curved end surface of the thin film waveguide path. This device is very compact and capable of high-speed scanning.
Inventors
- 👤 Kazuya Matsumoto
- 👤 Isao Yamaguchi
- 👤 Takao Tsuji
- 👤 Hideaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10532; G11B11/10541; G11B11/10543; G11B11/10547; G02; G02F; G02F1/00; G02F1/29; G02F1/33; G02F1/335; G11B7/00; G11B7/002; G11B7/003; G11B7/12; G11B7/123; G11B7/124; G11B7/1245
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A device for reproducing information on a recorded medium comprising: a wave guide for propagating a light beam; a magnetic transfer film provided on a light exit surface of said wave guide; first means for deflecting said light beam in said wave guide; second means for concentrating the deflected light beam on or near said magnetic transfer film; and third means for detecting the light beam from said magnetic transfer film.
Claim 2
Independent Claim
71 words
A device for reproducing information on a recorded medium comprising: a wave guide for propagating a light beam; a magnetic transfer film provided on a light exit surface of said wave guide; first means for deflecting said light beam in said wave guide; second means for concentrating the deflected light beam on or near said magnetic transfer film; and third means for detecting the light beam from said magnetic transfer film.
Claim 3
Dependent Claim
40 words
A device according to claim 1, wherein said first means comprises a comb-tooth-like transducer for exciting an acoustic wave in said wave guide, and means for applying to said transducer a signal whose frequency varies repeatedly within a predetermined range.
Claim 4
Dependent Claim
20 words
A device according to claim 1, wherein said second means comprises a thin film lens formed on said wave guide.
Claim 5
Dependent Claim
38 words
A device according to claim 3, wherein the light exit surface of said wave guide is substantially coincident with or parallel to the locus of the point whereat the light beam is condensed by said thin film lens.
Claim 6
Dependent Claim
22 words
A device according to claim 1, wherein said third means comprises a Bragg grating formed on said wave guide and a photodetector.
Claim 7
Dependent Claim
19 words
A device according to claim 1, wherein said magnetic transfer film has a protective film provided on its surface.
Claim 8
Independent Claim
68 words
A device for scanning a beam spot, comprising: a wave guide for propagating a light beam; means for deflecting the light beam in said wave guide; and a thin film lens provided in said wave guide for forming the beam spot, wherein said wave guide has an exit surface substantially coincident with or along a curved locus defined by the beam spot formed by said thin film lens.
Claim 9
Independent Claim
68 words
A device for scanning a beam spot, comprising: a wave guide for propagating a light beam; means for deflecting the light beam in said wave guide; and a thin film lens provided in said wave guide for forming the beam spot, wherein said wave guide has an exit surface substantially coincident with or along a curved locus defined by the beam spot formed by said thin film lens.
Claim 10
Dependent Claim
18 words
A device according to claim 7, wherein the beam spot is scanned repeatedly within a predetermined spatial range.
Claim 11
Dependent Claim
33 words
A device according to claim 7, wherein said deflecting means comprising a comb-tooth-like transducer for exiting an acoustic wave in said wave guide and means for applying a chirped signal to said transducer.
Claim 12
Independent Claim
89 words
A device for scanning a beam spot and for recording a signal on a recording medium, comprising: a wave guide for propagating a light beam; means for deflecting the light beam in said wave guide; and a thin film lens provided in said wave guide for forming the beam spot, wherein said wave guide has an exit surface substantially coincident with or along a curved locus defined by the beam spot formed by said thin film lens, and the recording medium is positioned in proximity to said exit surface.
Claim 13
Independent Claim
89 words
A device for scanning a beam spot and for recording a signal on a recording medium, comprising: a wave guide for propagating a light beam; means for deflecting the light beam in said wave guide; and a thin film lens provided in said wave guide for forming the beam spot, wherein said wave guide has an exit surface substantially coincident with or along a curved locus defined by the beam spot formed by said thin film lens, and the recording medium is positioned in proximity to said exit surface.
Claim 14
Dependent Claim
33 words
A device according to claim 10, wherein said deflecting means comprises a comb-tooth-like transducer for exciting an acoustic wave in said wave guide and means for applying a chirped signal to said transducer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |