US4260249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two slit illumination aperture
Assignee: International Business Machines Corp
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Filing: 1979-09-17
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Granted: 1981-04-07
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Expires: 1999-09-17
Abstract
Abstract A three piece aperture comprising a centerpiece positioned much as an "island" between two outer pieces so as to form two light transmissive slits. The two outer pieces may contain symmetrical light transmission edges. The aperture is of particular use in electrophotographic copier machines where substantially continuously variable reduction is practiced.
Inventors
- 👤 John D. Armitage, Jr.
- 👤 Wilson M. Routt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
An electrophotographic machine comprising: a document platen for holding a document to be copied; a photoreceptive surface with an exposure area for receiving an image of said document; a light source; light reflecting and transmissive means to form a light path and cause light from said source to carry an image of said document to said photoreceptive surface; and aperture means in said light path to shape the profile of said light so that said photoreceptive surface receives substantially constant exposure across said area, said aperture means comprising three pieces, a centerpiece placed between two outer pieces so as to form two variable width light transmitting slits.
Claim 2
Dependent Claim
107 words
An electrophotographic machine comprising: a document platen for holding a document to be copied; a photoreceptive surface with an exposure area for receiving an image of said document; a light source; light reflecting and transmissive means to form a light path and cause light from said source to carry an image of said document to said photoreceptive surface; and aperture means in said light path to shape the profile of said light so that said photoreceptive surface receives substantially constant exposure across said area, said aperture means comprising three pieces, a centerpiece placed between two outer pieces so as to form two variable width light transmitting slits.
Claim 3
Dependent Claim
16 words
The machine of claim 1 wherein said two outer pieces contain symmetrical light profile shaping edges.
Claim 4
Dependent Claim
23 words
The machine of claim 2 wherein said aperture is placed in said light path between the document to be copied and the image.
Claim 5
Dependent Claim
16 words
The machine of claim 3 wherein said aperture is placed adjacent to a light reflecting surface.
Claim 6
Dependent Claim
24 words
The machine of claim 4 wherein said light reflecting and transmission means includes a lens and the machine is capable of continuously variable reduction.
Claim 7
Dependent Claim
23 words
The machine of claim 1 wherein said aperture is placed in said light path between the document to be copied and the image.
Claim 8
Dependent Claim
16 words
The machine of claim 6 wherein said aperture is placed adjacent to a light reflecting surface.
Claim 9
Dependent Claim
24 words
The machine of claim 7 wherein said light reflecting and transmission means includes a lens and the machine is capable of continuously variable reduction.
References Cited (Backward Citations)
FR975090A
Cited
US3609037A
Cited
US3709602A
Cited
US3830591A
Cited
US3967894A
Cited
US3961847A
Cited
US4090788A
Cited
US4057342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |