Patent US4416530A successfully refreshed from Google Patents.
US4416530A
Expired / Lapsed
US
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Polarizing filters for enhancing contrast in xerographic copying machines
Assignee: Ricoh Co Ltd
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Filing: 1982-03-15
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Granted: 1983-11-22
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Expires: 2002-03-15
Abstract
Abstract A method for minimizing specular light reflection on copies produced in photocopying machines is provided wherein one or two polarizing filters are located within the photocopying machine.
Inventors
- 👤 Richard D. Hebert
- 👤 Daniel J. Lasky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/043; G03G15/0435
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
64 words
In a photocopying apparatus, comprising a light source, a reflection plane, optical elements to focus the light and an image plane; the improvement comprising; a light polarizing means juxtaposed between said reflection plane and said image lane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said polarizing means.
Claim 2
Dependent Claim
64 words
In a photocopying apparatus, comprising a light source, a reflection plane, optical elements to focus the light and an image plane; the improvement comprising; a light polarizing means juxtaposed between said reflection plane and said image lane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said polarizing means.
Claim 3
Dependent Claim
58 words
In a photocopying apparatus, comprising a light source, a reflection plane and an image plane; the improvement comprising; a light polarizing means juxtaposed between said reflection plane and said image plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said polarizing means.
Claim 4
Dependent Claim
58 words
In a photocopying apparatus, comprising a light source, a reflection plane and an image plane; the improvement comprising; a light polarizing means juxtaposed between said reflection plane and said image plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said polarizing means.
Claim 5
Dependent Claim
29 words
The apparatus according to claim 1 wherein said polarizing means is oriented with its polarizing axis at 90° with respect to the plane of said specularly reflected polarized light.
Claim 6
Dependent Claim
115 words
In a photocopying apparatus, comprising a light source, a reflection plane, optical elements to focus the light and an image plane; the improvement comprising a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; and a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said second polarizing means.
Claim 7
Dependent Claim
115 words
In a photocopying apparatus, comprising a light source, a reflection plane, optical elements to focus the light and an image plane; the improvement comprising a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; and a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said second polarizing means.
Claim 8
Dependent Claim
109 words
In a photocopying apparatus, comprising a light source, a reflection plane and an image plane; the improvement comprising a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; and a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said second polarizing means.
Claim 9
Dependent Claim
109 words
In a photocopying apparatus, comprising a light source, a reflection plane and an image plane; the improvement comprising a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; and a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by said second polarizing means.
Claim 10
Independent Claim
85 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light source, a reflection plane, optical elements to focus the light and said image plane; said method comprising projecting the light reflected from said reflection plane through a light polarizing means juxtaposed between said reflection plane and said image plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a light polarizing means.
Claim 11
Independent Claim
85 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light source, a reflection plane, optical elements to focus the light and said image plane; said method comprising projecting the light reflected from said reflection plane through a light polarizing means juxtaposed between said reflection plane and said image plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a light polarizing means.
Claim 12
Independent Claim
79 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light surce, a reflection plane, and said image plane; said method comprising projecting the light reflected from said reflection plane through a light polarizing means juxtaposed between said reflection plane and said image plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a light polarizing means.
Claim 13
Independent Claim
79 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light surce, a reflection plane, and said image plane; said method comprising projecting the light reflected from said reflection plane through a light polarizing means juxtaposed between said reflection plane and said image plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a light polarizing means.
Claim 14
Dependent Claim
31 words
The method according to claim 6 or 7 wherein said polarizing means is oriented with its polarizing axis at 90° with respect to the plane of said specularly reflected polarized light.
Claim 15
Dependent Claim
28 words
The method according to claim 8 wherein said reflection plane consists of a sheet of paper having areas of print thereon, said print comprising microscopic, irregularly-shaped specular particles.
Claim 16
Dependent Claim
12 words
The method according to claim 9 wherein said print is produced xerographically.
Claim 17
Dependent Claim
14 words
The method according to claim 9 wherein said print is produced by offset printing.
Claim 18
Dependent Claim
14 words
The method according to claim 9 wherein said print is produced by impact printing.
Claim 19
Dependent Claim
14 words
The method according to claim 9 wherein said print is produced by letterpress printing.
Claim 20
Dependent Claim
14 words
The method according to claim 9 wherein said print is produced by magnetographic printing.
Claim 21
Dependent Claim
12 words
The method according to claim 9 wherein said print comprises pencil graphite.
Claim 22
Independent Claim
129 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light source, a reflection plane, optical elements to focus the light and said image plane; said method comprising projecting the light from said light source through a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means.
Claim 23
Independent Claim
129 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light source, a reflection plane, optical elements to focus the light and said image plane; said method comprising projecting the light from said light source through a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means.
Claim 24
Independent Claim
123 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light source, a reflection plane, and said image plane; said method comprising projecting the light from said light source through a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means.
Claim 25
Independent Claim
123 words
A method for eliminating specular light reflection upon the image plane of a photocopying apparatus comprising a light source, a reflection plane, and said image plane; said method comprising projecting the light from said light source through a first light polarizing means juxtaposed between said light source and said reflection plane thereby causing only polarized light to be incident upon said reflection plane; whereby specularly reflected polarized light from said reflection plane directed toward said image plane is prevented from being incident upon said image plane by a second light polarizing means juxtaposed between said reflection plane and said image plane, said second polarizing means having its polarizing axis oriented 90° with respect to the polarizing axis of said first light polarizing means.
Claim 26
Dependent Claim
30 words
The method according to claim 16 or 17 wherein said reflection plane consists of a sheet of paper having areas of print thereon, said print comprising microscopic, irregularly-shaped specular particles.
Claim 27
Dependent Claim
12 words
The method according to claim 18 wherein said print is produced xerographically.
Claim 28
Dependent Claim
14 words
The method according to claim 18 wherein said print is produced by offset printing.
Claim 29
Dependent Claim
14 words
The method according to claim 18 wherein said print is produced by impact printing.
Claim 30
Dependent Claim
14 words
The method according to claim 18 wherein said print is produced by letterpress printing.
Claim 31
Dependent Claim
14 words
The method according to claim 18 wherein said print is produced by magnetograhic printing.
Claim 32
Dependent Claim
12 words
The method according to claim 18 wherein said print comprises pencil graphite.
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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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |