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US4960313A
Expired / Lapsed
US
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Apparatus for rotating a light image and an optical system for focusing light beams on a recording medium
Assignee: NEC Corp
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Filing: 1989-01-09
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Granted: 1990-10-02
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Expires: 2009-01-09
Abstract
Abstract An apparatus for rotating a light image comprises an optical medium such as a Dove prism, an assembly of three mirrors, a triangle prism etc., and a unit for rotating the optical medium. The optical medium is provided with n reflection planes in number each having a normal included in a predetermined plane including a reference light axis, where n is an odd number (n=1, 3, 5 . . . ). When an incident light beam parallel to the reference light axis is supplied to the optical medium, an output light beam having a predetermined rotating angle relative to the incident light beam is obtained by rotating the optical medium around a line parallel to the reference light axis. An optical system for focusing a light image further comprises a light source for radiating a plurality of light beams, and a focusing lens for focusing the light beams on a recording medium such as an optical disk, a photosensitive drum etc. The optical medium is positioned between the light source and the focusing lens, so that a line connecting beam spots formed on the recording medium by focusing the light beams is rotated by rotating the optical medium.
Inventors
- 👤 Yutaka Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/14; G02; G02B; G02B17/00; G02B17/02; G11B7/002; G11B7/0025; G11B7/135; G11B7/1359; G11B7/1372; G11B2007/13727
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
An apparatus for rotating a light image comprising, an optical medium having n reflection planes in number where n is an odd number (n = 1, 3, 5 ...), said optical medium receiving an incident light beam parallel to a reference light axis and transmitting an output light beam parallel to said reference light axis, each of said n reflection planes having a normal included in a predetermined plane including said reference light axis, and means for rotating said optical medium around a line, positioned outside said optical medium to be parallel to said reference light axis, by a predetermined angle based on a rotating angle of a light image.
Claim 2
Independent Claim
110 words
An apparatus for rotating a light image comprising, an optical medium having n reflection planes in number where n is an odd number (n = 1, 3, 5 ...), said optical medium receiving an incident light beam parallel to a reference light axis and transmitting an output light beam parallel to said reference light axis, each of said n reflection planes having a normal included in a predetermined plane including said reference light axis, and means for rotating said optical medium around a line, positioned outside said optical medium to be parallel to said reference light axis, by a predetermined angle based on a rotating angle of a light image.
Claim 3
Dependent Claim
56 words
An apparatus for rotating a light image according to claim 1, wherein said optical medium has m reflection planes in number, where m is an even number (m = 0, 2, 4 ...), each of said m reflection planes having a normal included in a plane including said reference light axis other than said predetermined plane.
Claim 4
Dependent Claim
50 words
An apparatus for rotating a light image according to claim 1, wherein said means for rotating includes a holder for containing said optical medium, a rotating shaft for supporting said holder rotatively, and an assembly of magnet coil and magnet core for producing a rotating force applied to said holder.
Claim 5
Dependent Claim
152 words
An optical system for focusing light beams on a recording medium comprising, means for radiating a plurality of light beams, a focusing lens for focusing said plurality of light beams on said recording medium, and a light image rotating unit positioned between said means for radiating and said focusing lens, wherein said light image rotating unit includes, an optical medium having n reflection planes in number, where n is an odd number (n = 1, 3, 5 ...), said optical medium receiving an incident light beam parallel to a reference light axis and transmitting an output light beam parallel to said reference light axis, each of said n reflection planes having a normal included in a predetermined plane including said reference light axis, and means for rotating said optical medium around a line parallel to said reference light axis by a predetermined angle based on a rotating angle of a light image.
Claim 6
Dependent Claim
152 words
An optical system for focusing light beams on a recording medium comprising, means for radiating a plurality of light beams, a focusing lens for focusing said plurality of light beams on said recording medium, and a light image rotating unit positioned between said means for radiating and said focusing lens, wherein said light image rotating unit includes, an optical medium having n reflection planes in number, where n is an odd number (n = 1, 3, 5 ...), said optical medium receiving an incident light beam parallel to a reference light axis and transmitting an output light beam parallel to said reference light axis, each of said n reflection planes having a normal included in a predetermined plane including said reference light axis, and means for rotating said optical medium around a line parallel to said reference light axis by a predetermined angle based on a rotating angle of a light image.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |