US4984858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light beam scanning optical system
Assignee: Minolta Co Ltd
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Filing: 1989-02-03
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Granted: 1991-01-15
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Expires: 2009-02-03
Abstract
Abstract A cylindrical lens for use in a light beam scanning optical system is arranged to have a luminous flux enter a deflection device in straight line in the direction of deflection. The luminous flux deflected by the deflection device enters a toroidal lens and is then directed toward the concave surface of the cylindrical mirror or a spherical mirror to converge on the surface of a photoconductor.
Inventors
- 👤 Muneo Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:15
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/06; E; E02; E02F; E02F3/00; E02F3/04; E02F3/627; H; H04; H04N; H04N1/00; H04N1/04; H04N1/113; H04N1/1135
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
113 words
A light beam scanning optical system, comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in the direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a cylindrical mirror for collecting luminous flux from the deflection device and turing said collected luminous flux onto the surface of a photoconductor; and a toroidal lens disposed between the deflection device and the cylindrical mirror in optical alignment therewith.
Claim 2
Dependent Claim
113 words
A light beam scanning optical system, comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in the direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a cylindrical mirror for collecting luminous flux from the deflection device and turing said collected luminous flux onto the surface of a photoconductor; and a toroidal lens disposed between the deflection device and the cylindrical mirror in optical alignment therewith.
Claim 3
Dependent Claim
41 words
A light beam scanning optical system as claimed in claim 1, further comprising a luminous flux rectifying means for rectifying said emitted luminous flux from the light source means into one of a parallel luminous flux and a convergent luminous flux.
Claim 4
Dependent Claim
130 words
A light beam scanning optical system, comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in a direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a cylindrical mirror for collecting said luminous flux from the deflection device and turning said collected luminous flux onto the surface of a photoconductor; and A toroidal lens disposed between the deflection device and the cylindrical mirror in optical alignment therewith, wherein the deflection device and the cylindrical mirror fulfill the following two equations, (|s/R.sub.3 a|)>0.5 (1)
Claim 5
Dependent Claim
130 words
A light beam scanning optical system, comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in a direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a cylindrical mirror for collecting said luminous flux from the deflection device and turning said collected luminous flux onto the surface of a photoconductor; and A toroidal lens disposed between the deflection device and the cylindrical mirror in optical alignment therewith, wherein the deflection device and the cylindrical mirror fulfill the following two equations, (|s/R.sub.3 a|)>0.5 (1)
Claim 6
Dependent Claim
63 words
1<(d/|R 3 a|)<0.7 (2) wherein d is a distance from a point of deflection of the deflection device to the vertex of the cylindrical mirror, R 3 a is a radius of curvature of the cylindrical mirror in the deflection plane and s is a distance from the point of deflection to a luminous flux collecting point after reflection at said deflection device.
Claim 7
Dependent Claim
63 words
1<(d/|R 3 a|)<0.7 (2) wherein d is a distance from a point of deflection of the deflection device to the vertex of the cylindrical mirror, R 3 a is a radius of curvature of the cylindrical mirror in the deflection plane and s is a distance from the point of deflection to a luminous flux collecting point after reflection at said deflection device.
Claim 8
Dependent Claim
40 words
Alight beam scanning optical system as claimed in claim 3, further comprising a luminous flux rectifying means for rectifying the emitted luminous flux from the light source means into one of a parallel luminous flux and a convergent luminous flux.
Claim 9
Dependent Claim
29 words
A light beam scanning optical system as claimed in claim 4, wherein the toroidal lens is offset to one side of the direction of deflection of the luminous flux.
Claim 10
Dependent Claim
29 words
A light beam scanning optical system as claimed in claim 5, wherein the cylindrical mirror is offset to one side of the direction of deflection of the luminous flux.
Claim 11
Dependent Claim
113 words
A light beam scanning optical system, comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in a direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a spherical mirror for collecting luminous flux from the deflection device and reflecting said collected luminous flux onto the surface of a photoconductor; and a toroidal lens disposed between the deflection device and the spherical mirror in optical alignment therewith.
Claim 12
Dependent Claim
113 words
A light beam scanning optical system, comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in a direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a spherical mirror for collecting luminous flux from the deflection device and reflecting said collected luminous flux onto the surface of a photoconductor; and a toroidal lens disposed between the deflection device and the spherical mirror in optical alignment therewith.
Claim 13
Dependent Claim
41 words
A light beam scanning optical system as claimed in claim 7, further comprising a luminous flux rectifying means for rectifying the emitted luminous flux from the light source means into one of a parallel luminous flux and a convergent luminous flux.
Claim 14
Dependent Claim
186 words
A light beam scanning optical system comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in a direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a spherical mirror for collecting a luminous flux from the deflection device and turning said collected luminous flux onto the surface of a photoconductor; and a toroidal lens disposed between the deflection device and the spherical mirror in optical alignment therewith, wherein the deflection device and the spherical mirror fulfill the following two equations; (|s/R.sub.M |)>0.4 (3) 0.2<(d/|R.sub.M |)<0.7 (4) wherein d is a distance from a point of deflection of the deflection device to the vertex of the spherical mirror, R M is a radius of curvature of the spherical mirror and s is a distance from said point of deflection to a light collecting point after reflection at said deflection device.
Claim 15
Dependent Claim
186 words
A light beam scanning optical system comprising: a light source means for emitting a modulated luminous flux; a luminous flux converging means for converging said modulated luminous flux emitted from the light source means into a straight line in a direction parallel to a deflection plane; a deflection device disposed in the vicinity where said luminous flux is converged into said straight line for deflecting the converged luminous flux at an equiangular velocity; a spherical mirror for collecting a luminous flux from the deflection device and turning said collected luminous flux onto the surface of a photoconductor; and a toroidal lens disposed between the deflection device and the spherical mirror in optical alignment therewith, wherein the deflection device and the spherical mirror fulfill the following two equations; (|s/R.sub.M |)>0.4 (3) 0.2<(d/|R.sub.M |)<0.7 (4) wherein d is a distance from a point of deflection of the deflection device to the vertex of the spherical mirror, R M is a radius of curvature of the spherical mirror and s is a distance from said point of deflection to a light collecting point after reflection at said deflection device.
Claim 16
Dependent Claim
41 words
A light beam scanning optical system as claimed in claim 9, further comprising a luminous flux rectifying means for rectifying the emitted luminous flux from the light source means into one of a parallel luminous flux and a convergent luminous flux.
Claim 17
Dependent Claim
29 words
A light beam scanning optical system as claimed in claim 9, wherein the toroidal lens is offset to one side of the direction of deflection of the luminous flux.
Claim 18
Dependent Claim
29 words
A light beam scanning optical system as claimed in claim 11, wherein the spherical mirror is offset to one side of the direction of deflection of the luminous flux.
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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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |