US3750189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light scanning and printing system
Assignee: International Business Machines Corp
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Filing: 1971-10-18
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Granted: 1973-07-31
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Expires: 1991-10-18
Abstract
Abstract A light scanning system of controlled spot motion variation perpendicular to the direction of scan utilizing a rotating mirror and two cylindrical or toroidal lenses positioned relative to the rotating mirror to allow increased nominal axis of rotation to facet angular tolerances while maintaining a distinct non-overlapping line scan. Specifically, for one application the axis of rotation of the mirror is orthogonal to the plane formed by the incoming and reflected beam from the mirror. The first cylindrical or toroidal lens, which has little or no power in the scan plane, focuses the incoming beam in the azimuth perpendicular to the scan onto the mirror while the second cylindrical lens acts as a beam configurer to configure the beam to substantially collimated shape while directing it towards a spherical lens for focusing onto an image plane.
Inventors
- 👤 J Fleischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:50
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; B; B41; B41J; B41J2/00; B41J2/435; B41J2/47; B41J2/471; G01; G01D; G01D15/00; G01D15/14; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; H; H04; H04N; H04N3/00; H04N3/02; H04N3/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
159 words
A light scanning system of controlled spot motion variation perpendicular to the direction of scan comprising: light means for generating a light beam; first focusing means having a major and a minor axis each of a different power for focusing upon a reflecting means the incoming light beam from the light means to a line image parallel to the major axis of the first focusing means; beam configuring means having a major and a minor axis each of a different power to configure the light beam reflected from the reflecting means to substantially collimated shape, the reflecting means being aligned with its reflection normal in the plane formed by the incoming and reflected beam; and second focusing means for focusing the light beam from the beam configuring means to an image on an image surface; whereby a distinct parallel line scan is achievable while allowing increased reflecting means tolerances of angle between nominal axis of rotation and reflecting surface.
Claim 2
Dependent Claim
159 words
A light scanning system of controlled spot motion variation perpendicular to the direction of scan comprising: light means for generating a light beam; first focusing means having a major and a minor axis each of a different power for focusing upon a reflecting means the incoming light beam from the light means to a line image parallel to the major axis of the first focusing means; beam configuring means having a major and a minor axis each of a different power to configure the light beam reflected from the reflecting means to substantially collimated shape, the reflecting means being aligned with its reflection normal in the plane formed by the incoming and reflected beam; and second focusing means for focusing the light beam from the beam configuring means to an image on an image surface; whereby a distinct parallel line scan is achievable while allowing increased reflecting means tolerances of angle between nominal axis of rotation and reflecting surface.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 wherein the reflecting means is a rotating mirror. 3 The apparatus of claim 1 wherein the first focusing means is a cylindrical lens.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1 wherein the beam configuring means is a cylindrical lens.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein the second focusing means is a spherical lens.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1 wherein a photosensitive material is located at the image plane.
Claim 7
Dependent Claim
24 words
The apparatus of claim 1 wherein the light means includes light modulator means for modulating the light beam incident to the first focusing means.
Claim 8
Dependent Claim
14 words
The apparatus of claim 1 wherein the first focusing means is a toroidal lens.
Claim 9
Dependent Claim
14 words
The apparatus of claim 1 wherein the beam configuring means is a toroidal lens.
Claim 10
Dependent Claim
159 words
A laser printer comprising: laser light means for generating a light beam directed toward a modulator means for modulating the light beam intensity; first focusing means having a major and a minor axis each of a different power for focusing upon a reflecting means the incoming light beam from the modulator means to a line image parallel to the major axis of the first focusing means; beam configuring means having a major and a minor axis each of a different power to configure the light beam reflected from the reflecting means to substantially collimated shape, the reflecting means being aligned with its reflection normal in the plane formed by the incoming and reflected beam; and second focusing means for focusing the light beam from the beam configuring means to an image on An electrophotographic surface; whereby a distinct parallel line printing is achievable while allowing increased reflecting means tolerances of angle between nominal axis of rotation and reflecting surface.
Claim 11
Dependent Claim
159 words
A laser printer comprising: laser light means for generating a light beam directed toward a modulator means for modulating the light beam intensity; first focusing means having a major and a minor axis each of a different power for focusing upon a reflecting means the incoming light beam from the modulator means to a line image parallel to the major axis of the first focusing means; beam configuring means having a major and a minor axis each of a different power to configure the light beam reflected from the reflecting means to substantially collimated shape, the reflecting means being aligned with its reflection normal in the plane formed by the incoming and reflected beam; and second focusing means for focusing the light beam from the beam configuring means to an image on An electrophotographic surface; whereby a distinct parallel line printing is achievable while allowing increased reflecting means tolerances of angle between nominal axis of rotation and reflecting surface.
Claim 12
Dependent Claim
13 words
The apparatus of claim 10 wherein the reflecting means is a rotating mirror.
Claim 13
Dependent Claim
14 words
The apparatus of claim 10 wherein the first focusing means is a cylindrical lens.
Claim 14
Dependent Claim
14 words
The apparatus of claim 10 wherein the beam configuring means is a cylindrical lens.
Claim 15
Dependent Claim
14 words
The apparatus of claim 10 wherein the second focusing means is a spherical lens.
Claim 16
Dependent Claim
15 words
The apparatus of claim 10 wherein a photosensitive material is located at the image plane.
Claim 17
Dependent Claim
24 words
The apparatus of claim 10 wherein the light means includes light modulator means for modulating the light beam incident to the first focusing means.
Claim 18
Dependent Claim
14 words
The apparatus of claim 10 wherein the first focusing means is a toroidal lens.
Claim 19
Dependent Claim
14 words
The apparatus of claim 10 wherein the beam configuring means is a toroidal lens.
Claim 20
Dependent Claim
15 words
The printer of claim 10 wherein the electrophotographic surface is a photoconductive surfaced drum configuration.
Claim 21
Dependent Claim
14 words
The printer of claim 10 wherein the modulator means modulates the light beam intensity.
Claim 22
Dependent Claim
22 words
The printer of claim 19 wherein the modulator means modulates the beam to expose the photoconductive surface in a dot matrix pattern.
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |