Patent US3909613A successfully refreshed from Google Patents.
US3909613A
Expired / Lapsed
US
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Copying method and apparatus with means to effect visible ray imaging and infrared ray transfixing or fusing
Assignee: Xerox Corp
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Filing: 1974-01-02
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Granted: 1975-09-30
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Expires: 1994-01-02
Abstract
Abstract To improve the quality of the copies produced by a thermographic copier which relies on a tungsten lamp to thermally expose a heat sensitive member to an original which has some areas which absorb principally infra-red energy and others which absorb principally visible energy, a substantial portion of the infra-red energy emitted by the lamp is filtered out during the exposure process to thereby obtain a better balance between the infra-red energy and the visible energy. Toner particles containing materials which are absorbtive in the infra-red and visible spectrums are then applied to the sheet sensitive member to develop the image, and the developed image is thereafter fused on the heat sensitive member or transfixed onto a separate copy sheet under the influence of radiation from the same lamp but at a higher infrared energy level.
Inventors
- 👤 James A Critchlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:08
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/30; G03D; G03D13/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A method for using a radiant source which emits substantially more infra-red radiation than visible radiation in thermographically copying an original bearing an image which is principally absorbtive to visible radiation; said method comprising the steps of bringing said original into engagement with a heat sensitive member to form a sandwich, exposing said sandwich to radiation from said source to thermally impart said image to said heat sensitive member, and filtering out a predetermined part of the infra-red radiation emitted from said source while exposing said sandwich, with said filtered out part being selected to prevent excessive heating of infra-red absorbtive areas of said original.
Claim 2
Independent Claim
105 words
A method for using a radiant source which emits substantially more infra-red radiation than visible radiation in thermographically copying an original bearing an image which is principally absorbtive to visible radiation; said method comprising the steps of bringing said original into engagement with a heat sensitive member to form a sandwich, exposing said sandwich to radiation from said source to thermally impart said image to said heat sensitive member, and filtering out a predetermined part of the infra-red radiation emitted from said source while exposing said sandwich, with said filtered out part being selected to prevent excessive heating of infra-red absorbtive areas of said original.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein at least 90 percent of the radiation absorbed by said image is visible radiation.
Claim 4
Dependent Claim
46 words
The method of claim 2 further comprising the steps of developing the image on the heat sensitive member with an infra-red absorbing material, and exposing the developed image to a substantially higher level of infra-red radiation from said source than was utilized while exposing said sandwich.
Claim 5
Dependent Claim
23 words
The method as recited in claim 3 wherein the developed image is fused to the heat sensitive sheet when exposed to said radiation.
Claim 6
Dependent Claim
29 words
The method as recited in claim 3 wherein the developed image is transferred from the heat sensitive sheet and fixed to a copy member when exposed to said radiation.
Claim 7
Dependent Claim
32 words
The method as recited in claim 3 wherein the exposure of a portion of the developed image to said radiation is simultaneous with the exposure of a trailing portion of said sandwich.
Claim 8
Dependent Claim
65 words
A thermographic copier comprising the combination of a radiant source which emits substantially more infra-red radiation than visible radiation, an imaging station, and means including dichroic filter for focusing radiation from said source onto said imaging station, said filter being selected to prevent a predetermined part of the infra-red radiation emitted by said source from reaching said imaging station without materially attenuating the visible radiation.
Claim 9
Dependent Claim
65 words
A thermographic copier comprising the combination of a radiant source which emits substantially more infra-red radiation than visible radiation, an imaging station, and means including dichroic filter for focusing radiation from said source onto said imaging station, said filter being selected to prevent a predetermined part of the infra-red radiation emitted by said source from reaching said imaging station without materially attenuating the visible radiation.
Claim 10
Dependent Claim
14 words
The thermographic copier of claim 7 wherein said radiant source is a tungsten lamp.
Claim 11
Dependent Claim
123 words
A thermographic copier comprising the combination of a radiant source which emits substantially more infra-red radiation than visible radiation, an imaging station where images carried by an original are thermally imparted to a heat sensitive member, a fixing station where developed images on said heat sensitive member are fused, a first reflector having a dichroic filter-type surface coating for focusing radiation from said source to said imaging station while filtering out at least a part of the infra-red radiation, and a second reflector having a different dichroic filtertype surface coating for focusing radiation from said source to said imaging station while filtering out at least a part of the visible radiation; said first and second filters being positioned to surround said radiant source.
Claim 12
Dependent Claim
123 words
A thermographic copier comprising the combination of a radiant source which emits substantially more infra-red radiation than visible radiation, an imaging station where images carried by an original are thermally imparted to a heat sensitive member, a fixing station where developed images on said heat sensitive member are fused, a first reflector having a dichroic filter-type surface coating for focusing radiation from said source to said imaging station while filtering out at least a part of the infra-red radiation, and a second reflector having a different dichroic filtertype surface coating for focusing radiation from said source to said imaging station while filtering out at least a part of the visible radiation; said first and second filters being positioned to surround said radiant source.
Claim 13
Dependent Claim
13 words
The thermographic copier of claim 9 wherein said source is a tungsten lamp.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |