Patent US3677643A successfully refreshed from Google Patents.
US3677643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflective platen
Assignee: 3M Co
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Filing: 1971-04-20
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Granted: 1972-07-18
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Expires: 1991-04-20
Abstract
Abstract A platen having a wall defining a reflective supporting surface upon which a first sheet of material is to be supported for exposure of graphic intelligence on the first sheet by directing light toward the platen and first sheet to afford reproduction of said graphic intelligence on a second sheet. The wall may be formed with a multiplicity of orifices communicating between the first sheet on the supporting surface and a means for reducing air pressure in the orifices to attract the first sheet to the platen. A recess in the supporting surface defined by a converging wall is formed about each orifice. The converging wall is formed to reflect incident light through the discontinuity in the supporting surface defined by the recess in generally an even intensity across the discontinuity and with generally the same intensity as light is reflected by the supporting surface thereby destroying the reflected image of the orifices and recesses at the supporting surface.
Inventors
- 👤 Burt K Sagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:24
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/18; G03B27/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
148 words
In a copy machine including a platen having a wall defining a reflective supporting surface upon which a first sheet of material is to be supported for exposure to afford the reproduction of graphic intelligence on said first sheet by producing a latent image on a second sheet material from light directed toward the platen and first sheet, said wall being formed with a multiplicity of orifices in said supporting surface and communicating with means for regulating the pressure in said orifices, the improvement comprising: said wall being formed with a plurality of recesses disposed about said orifices, each said recess being defined by converging wall means defining a discontinuity in said supporting surface, said converging wall means being reflective and being disposed for reflecting incident light through said discontinuity in even intensity across said discontinuity, thereby destroying the reflected image of said orifice at said supporting surface.
Claim 2
Dependent Claim
148 words
In a copy machine including a platen having a wall defining a reflective supporting surface upon which a first sheet of material is to be supported for exposure to afford the reproduction of graphic intelligence on said first sheet by producing a latent image on a second sheet material from light directed toward the platen and first sheet, said wall being formed with a multiplicity of orifices in said supporting surface and communicating with means for regulating the pressure in said orifices, the improvement comprising: said wall being formed with a plurality of recesses disposed about said orifices, each said recess being defined by converging wall means defining a discontinuity in said supporting surface, said converging wall means being reflective and being disposed for reflecting incident light through said discontinuity in even intensity across said discontinuity, thereby destroying the reflected image of said orifice at said supporting surface.
Claim 3
Dependent Claim
38 words
The machine of claim 1 wherein each said converging wall means comprises a converging wall having a reflective surface surrounding said orifice and disposed with respect to a tangent to said supporting surface at generally a 40* angle.
Claim 4
Dependent Claim
18 words
The machine of claim 1 wherein said supporting surface and wall means have a reflectivity above 68 percent.
Claim 5
Dependent Claim
25 words
The machine of claim 2 wherein said supporting surface and said reflective wall surface have a reflectivity essentially equivalent to that of white bond paper.
Claim 6
Dependent Claim
18 words
The machine of claim 2 wherein said supporting surface and the surface of said reflective wall comprise cadmium.
Claim 7
Dependent Claim
122 words
A platen having a wall defining a reflective supporting surface for supporting a first sheet of material in a predetermined relationship with a second sheet material to afford reproduction of graphic intelligence by producing an image of said first sheet on said second sheet material by reflection of light directed toward said supporting surface, said platen being formed with at least one recess in said wall, said recess defining a discontinuity in said supporting surface and being defined by reflective wall means for reflecting incident light through said discontinuity in generally an even intensity across said discontinuity and with an intensity generally equal to light reflected by said supporting surface, thereby destroying the reflected image of said recess at said supporting surface.
Claim 8
Dependent Claim
122 words
A platen having a wall defining a reflective supporting surface for supporting a first sheet of material in a predetermined relationship with a second sheet material to afford reproduction of graphic intelligence by producing an image of said first sheet on said second sheet material by reflection of light directed toward said supporting surface, said platen being formed with at least one recess in said wall, said recess defining a discontinuity in said supporting surface and being defined by reflective wall means for reflecting incident light through said discontinuity in generally an even intensity across said discontinuity and with an intensity generally equal to light reflected by said supporting surface, thereby destroying the reflected image of said recess at said supporting surface.
Claim 9
Dependent Claim
27 words
A platen as described in claim 6 further comprising means located in said recess for interacting between a said sheet on said supporting surface and said platen.
Claim 10
Dependent Claim
41 words
A platen according to claim 7 wherein said means interacting between a said sheet and said platen comprises an orifice formed in said platen wall and communicating between a said sheet on said supporting surface and a source of adjustable pressure.
Claim 11
Dependent Claim
38 words
The machine of claim 6 wherein each said converging wall means comprises a converging wall having a reflective surface surrounding said orifice and disposed with respect to a tangent to said supporting surface at generally a 40* angle.
Claim 12
Dependent Claim
18 words
The machine of claim 6 wherein said supporting surface and wall means have a reflectivity about 68 percent.
References Cited (Backward Citations)
US3521538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |