US5066083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning optical system
Assignee: Canon Inc
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Filing: 1991-01-11
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Granted: 1991-11-19
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Expires: 2011-01-11
Abstract
Abstract The present invention relates to a scanning optical system and a scanning optical apparatus in which the pivot axis and the mirror surface of the deflector are inclined to have a predetermined relationship so as to obtain practical planeness of a surface to be scanned. A scanning optical system according to the present inhvention comprises a light source, lens for converging a light beam from the light source and a deflector for deflecting the light beam in a predetermined direction. In the optical scanning system according to the present invention, the maximum deflection angle of the deflector, a relationship between a radius of curvature of the deflection/reflection surface of the deflector and a distance between an object point of a light beam incident on the deflection/reflection surface of the deflector and the deflection/reflection surface for reflecting a central ray of the incident light beam, are determined to satisfy with a predetermined condition. And further, a relationship between an angle defined by a predetermined pivot axis of the deflector and the deflection/reflection surface of the deflector and an incident angle of the light beam from the light source to the deflection/reflection surface of the deflector within a plane including the predetermined axis and perpendicular to the deflection plane when the light beam emerging from the deflector is present within a single plane, is determined to satisfy with a predetermined condition.
Inventors
- 👤 Jun Makino
- 👤 Masamichi Tateoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:44
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; G; G02; G02B; G02B26/00; G02B26/08; G02B26/10
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
73 words
A scanning optical system comprising: a light source; a lens for converging a light beam from said light source; and a deflector for deflecting the converged light beam from said lens in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates, wherein when a maximum deflection angle of said deflector is represented by ψ max a within a deflection plane of said deflector, the following condition is satisfied: 38°≦ψ.sub.max ≦50°
Claim 2
Dependent Claim
73 words
A scanning optical system comprising: a light source; a lens for converging a light beam from said light source; and a deflector for deflecting the converged light beam from said lens in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates, wherein when a maximum deflection angle of said deflector is represented by ψ max a within a deflection plane of said deflector, the following condition is satisfied: 38°≦ψ.sub.max ≦50°
Claim 3
Dependent Claim
34 words
A system according to claim 1, wherein when the maximum deflection angle of said deflector is represented by ψ max within the deflection plane of said deflector, the following condition is satisfied: 40°≦ψ.sub.max ≦46°
Claim 4
Dependent Claim
125 words
A scanning optical system comprising: a light source; a lens for converging a light beam from said light source; and a deflector for deflecting the converged light beam from said lens in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates, wherein when a curvature of the deflector is represented by ψ max , a radius of curvature of the deflection/reflection surface of said deflector is represented by r, and a distance between an object point of a light beam incident on the deflection/reflection surface of said deflector and the deflection/reflection surface for reflecting a central ray of the incident light beam is represented by s in a deflection plane of said deflector, the following condition is satisfied: 3°≦ψ.sub. max ≦50° 0.35≦s/r≦0.45
Claim 5
Dependent Claim
125 words
A scanning optical system comprising: a light source; a lens for converging a light beam from said light source; and a deflector for deflecting the converged light beam from said lens in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates, wherein when a curvature of the deflector is represented by ψ max , a radius of curvature of the deflection/reflection surface of said deflector is represented by r, and a distance between an object point of a light beam incident on the deflection/reflection surface of said deflector and the deflection/reflection surface for reflecting a central ray of the incident light beam is represented by s in a deflection plane of said deflector, the following condition is satisfied: 3°≦ψ.sub. max ≦50° 0.35≦s/r≦0.45
Claim 6
Dependent Claim
73 words
A system according to claim 3, wherein when a radius of curvature of the deflection/reflection surface of said deflector is represented by r, and a distance between an object point of a light beam incident on the deflection/reflection surface of said deflector and the deflection/reflection surface for reflecting a central ray of the incident light beam is represented by s in a deflection plane of said deflector, the following condition is satisfied: 0.38≦s/r≦0.42
Claim 7
Dependent Claim
34 words
A system according to claim 3, wherein when the maximum deflection angle of said deflector is represented by ψ max within the deflection plane of said deflector, the following condition is satisfied: 40°≦ψ.sub.max ≦46°.
Claim 8
Dependent Claim
149 words
A scanning optical system comprising: a light source; a lens for converging a light beam from said light source; and a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface and being pivoted about a predetermined axis, and the predetermined axis and the light beam incident on the deflector being present within a single plane, wherein when the light beam incident on said deflector and a light beam emerged from said deflector are present within a single plane, if an angle defined by the predetermined axis and the deflection/reflection surface of said deflector is represented by β and an incident angle of the light beam from said light source to the deflection/reflection surface of said deflector is represented by α within a plane including the predetermined axis and perpendicular to a deflection plane, the following condition is satisfied:
Claim 9
Dependent Claim
149 words
A scanning optical system comprising: a light source; a lens for converging a light beam from said light source; and a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface and being pivoted about a predetermined axis, and the predetermined axis and the light beam incident on the deflector being present within a single plane, wherein when the light beam incident on said deflector and a light beam emerged from said deflector are present within a single plane, if an angle defined by the predetermined axis and the deflection/reflection surface of said deflector is represented by β and an incident angle of the light beam from said light source to the deflection/reflection surface of said deflector is represented by α within a plane including the predetermined axis and perpendicular to a deflection plane, the following condition is satisfied:
Claim 10
Dependent Claim
1 words
5×2α<β<1.2×2α
Claim 11
Dependent Claim
1 words
5×2α<β<1.2×2α
Claim 12
Dependent Claim
14 words
A system according to claim 6, wherein the following condition is further satisfied: 0.8×2α<β<1.1×2α
Claim 13
Dependent Claim
85 words
A laser beam printer apparatus comprising: a light source; a lens for converging a light beam from said light source; a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates; and a recording medium for receiving the light beam deflected by said deflector, wherein when a maximum deflection angle of said deflector is represented by Ψ max within a deflection plane of said deflector, the following condition is satisfied: 38°≦Ψ.sub.max ≦═°
Claim 14
Dependent Claim
85 words
A laser beam printer apparatus comprising: a light source; a lens for converging a light beam from said light source; a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates; and a recording medium for receiving the light beam deflected by said deflector, wherein when a maximum deflection angle of said deflector is represented by Ψ max within a deflection plane of said deflector, the following condition is satisfied: 38°≦Ψ.sub.max ≦═°
Claim 15
Dependent Claim
34 words
An apparatus according to claim 8, wherein when the maximum deflection angle of said deflector is represented by Ψ max within the deflection plane of said deflector, the following condition is satisfied: 40°≦Ψ.sub.max ≦46°
Claim 16
Dependent Claim
14 words
An apparatus according to claim 8, wherein said recording medium is a photosensitive member.
Claim 17
Dependent Claim
139 words
A laser beam printer apparatus comprising: a light source; a lens for converging a light beam from said light source; a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates; and a recording medium for receiving the light beam defected by said deflector, wherein when a maximum deflection angle of said deflector is presented by Ψ max , a radius of curvature of the deflection/reflection surface of said deflector is represented by r, and a distance between an object point of a light beam incident on the deflection/reflection surface of said deflector and the defection/reflection surface for reflecting a central ray of the incident light beam is represented by s in a deflection plane of said deflector, the following conditions are satisfied: 38°≦Ψ.sub.max ≦50° 0.35≦s/r≦0.45
Claim 18
Dependent Claim
139 words
A laser beam printer apparatus comprising: a light source; a lens for converging a light beam from said light source; a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface which sinusoidally oscillates; and a recording medium for receiving the light beam defected by said deflector, wherein when a maximum deflection angle of said deflector is presented by Ψ max , a radius of curvature of the deflection/reflection surface of said deflector is represented by r, and a distance between an object point of a light beam incident on the deflection/reflection surface of said deflector and the defection/reflection surface for reflecting a central ray of the incident light beam is represented by s in a deflection plane of said deflector, the following conditions are satisfied: 38°≦Ψ.sub.max ≦50° 0.35≦s/r≦0.45
Claim 19
Dependent Claim
14 words
An apparatus according to claim 11, wherein said recording medium is a photosensitive member.
Claim 20
Dependent Claim
73 words
An apparatus according to claim 11, wherein when a radius of curvature of the deflection/reflection surface of said deflector is represented by r, and a distance between an object point of a light beam incident on the deflection/reflection surface of said deflector and the deflection/reflection surface for reflecting a central ray of the incident light beam is represented by s in a deflection plane of said deflector, the following condition is satisfied: 0.38≦s/r≦0.42
Claim 21
Dependent Claim
34 words
An apparatus according to claim 11, wherein when the maximum deflection angle of said deflector is represented by Ψ max within the deflection plane of said deflector, the following condition is satisfied: 40°≦Ψ.sub.max ≦46°
Claim 22
Dependent Claim
163 words
A laser beam printer apparatus comprising: a light source; a lens for converging a light beam from said light source; a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface and being pivoted bout a predetermined axis, and the predetermined axis and the light beam incident on the deflector being present within a single plane; and a recording medium for receiving the light beam deflected by said deflector, wherein when the light beam incident on said deflector and a light beam emerged from said deflector are present within a single plane, if an angle defined by the predetermined axis and the deflection/reflection surface of said deflector is represented by β and an incident angle of the light beam from said light source to the deflection/reflection surface of said deflector is represented by α within a plane including the predetermined axis and perpendicular to a deflection plane, the following condition is satisfied: 0.5×2α<β<1.2×2α
Claim 23
Dependent Claim
163 words
A laser beam printer apparatus comprising: a light source; a lens for converging a light beam from said light source; a deflector for deflecting the light beam from said light source in a predetermined direction, said deflector having a deflection/reflection surface and being pivoted bout a predetermined axis, and the predetermined axis and the light beam incident on the deflector being present within a single plane; and a recording medium for receiving the light beam deflected by said deflector, wherein when the light beam incident on said deflector and a light beam emerged from said deflector are present within a single plane, if an angle defined by the predetermined axis and the deflection/reflection surface of said deflector is represented by β and an incident angle of the light beam from said light source to the deflection/reflection surface of said deflector is represented by α within a plane including the predetermined axis and perpendicular to a deflection plane, the following condition is satisfied: 0.5×2α<β<1.2×2α
Claim 24
Dependent Claim
14 words
An apparatus according to claim 15, wherein the following condition is further satisfied: 0.8×2α<β<1.1×2α
Claim 25
Dependent Claim
14 words
An apparatus according to claim 15, wherein said recording medium is a photosensitive member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |