US3673594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photocopying device
Assignee: International Business Machines Corp
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Filing: 1970-03-16
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Granted: 1972-06-27
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Expires: 1990-03-16
Abstract
Abstract Photocopying and magnetic recording re enhanced by employing a recording medium, such as a heat-sensitive paper or a magnetic film adjacent to a semiconductor layer. When the semiconductor is exposed to a low level light image, a charge pattern is created in its surface which is retained and which produces a conductivity pattern in the semiconductor layer. The application of radio-frequency power to the semiconductor converts the conductivity pattern to a heat pattern which is recorded as a visible image on the heat-sensitive paper or as data on the magnetic film.
Inventors
- 👤 Benjamin Kazan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:57
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; G; G03; G03B; G03B15/00; G03B27/00; G03B27/02; G03B27/14; G03B27/30; G03B27/306; G03G; G03G13/00; G03G13/22; G03G19/00; G03G5/00; G03G5/153
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A photocopying device comprising a heat-sensitive recording element, a field-effect controlled semiconductor contacting said element, means for establishing a charge pattern in the form of electrical conductivity variations on the surface of said semiconductor, and radio-frequency electric field means for locally heating said semiconductor so as to reproduce said stored charge pattern as a visible image on said recording element.
Claim 2
Dependent Claim
60 words
A photocopying device comprising a heat-sensitive recording element, a field-effect controlled semiconductor contacting said element, means for establishing a charge pattern in the form of electrical conductivity variations on the surface of said semiconductor, and radio-frequency electric field means for locally heating said semiconductor so as to reproduce said stored charge pattern as a visible image on said recording element.
Claim 3
Dependent Claim
81 words
A photocopying device comprising a heat-sensitive recording element, a field-effect controlled semiconductor layer in contact with said recording element, means for exposing said semiconductor to an optical image so as to store a charge pattern in said semiconductor in accordance with the intensity of light emanating from said image, and means for applying a radio-frequency electric field to said semiconductor so as to locally heat said semiconductor and reproduce said stored charge pattern as a visible image onto said recording element.
Claim 4
Dependent Claim
81 words
A photocopying device comprising a heat-sensitive recording element, a field-effect controlled semiconductor layer in contact with said recording element, means for exposing said semiconductor to an optical image so as to store a charge pattern in said semiconductor in accordance with the intensity of light emanating from said image, and means for applying a radio-frequency electric field to said semiconductor so as to locally heat said semiconductor and reproduce said stored charge pattern as a visible image onto said recording element.
Claim 5
Dependent Claim
13 words
The photocopying device of claim 2 wherein said field-effect controlled semiconductor is ZnO.
Claim 6
Dependent Claim
76 words
A photocopying device comprising a heat-sensitive recording element, a field-effect controlled composite layer comprising a semiconductor and an electrical insulator adjacent said heat-sensitive recording element, means for establishing a charge pattern on said insulating surface by a direct flow of charge to said insulating surface, and means for applying a radio-frequency field to said semiconductor so as to locally heat said semiconductor and reproduce said stored charge pattern as a visible image on said recording element.
Claim 7
Dependent Claim
76 words
A photocopying device comprising a heat-sensitive recording element, a field-effect controlled composite layer comprising a semiconductor and an electrical insulator adjacent said heat-sensitive recording element, means for establishing a charge pattern on said insulating surface by a direct flow of charge to said insulating surface, and means for applying a radio-frequency field to said semiconductor so as to locally heat said semiconductor and reproduce said stored charge pattern as a visible image on said recording element.
Claim 8
Dependent Claim
99 words
In a method of photocopying an image comprising the steps of providing a field-effect controlled semiconductor in contact with a heat-sensitive recording element, applying a uniform negative charge to said semiconductor while maintaining the latter in the dark, exposing said uniformly charged semiconductor to said image so as to produce a stored charge pattern in said semiconductor in accordance with the intensity of the light emanating from said image, and applying a radio-frequency electric field to said semiconductor so as to locally heat said semiconductor and reproduce said stored charGe pattern as a visible image onto said recording element.
Claim 9
Dependent Claim
99 words
In a method of photocopying an image comprising the steps of providing a field-effect controlled semiconductor in contact with a heat-sensitive recording element, applying a uniform negative charge to said semiconductor while maintaining the latter in the dark, exposing said uniformly charged semiconductor to said image so as to produce a stored charge pattern in said semiconductor in accordance with the intensity of the light emanating from said image, and applying a radio-frequency electric field to said semiconductor so as to locally heat said semiconductor and reproduce said stored charGe pattern as a visible image onto said recording element.
Claim 10
Dependent Claim
77 words
In a method of photocopying data comprising the steps of providing a field-effect controlled semiconductor in contact with a heat-sensitive recording element, applying an electric field to the surface of said semiconductor, said electric field being modulated by said data to be copied so as to provide a stored charge pattern on said semiconductor, and applying a radio-frequency electric field to locally heat said semiconductor and thus reproduce said stored charge pattern onto said heat-sensitive recording element.
Claim 11
Dependent Claim
77 words
In a method of photocopying data comprising the steps of providing a field-effect controlled semiconductor in contact with a heat-sensitive recording element, applying an electric field to the surface of said semiconductor, said electric field being modulated by said data to be copied so as to provide a stored charge pattern on said semiconductor, and applying a radio-frequency electric field to locally heat said semiconductor and thus reproduce said stored charge pattern onto said heat-sensitive recording element.
Claim 12
Dependent Claim
143 words
In a method of photocopying data onto a magnetic recording element comprising the steps of providing a field-effect controlled semiconductor in contact with a heat-sensitive magnetic film maintained below its Curie point, uniformly magnetizing said film in a first direction, uniformly charging said semiconductor with a negative charge while maintaining said semiconductor in the dark, exposing said field-effect controlled semiconductor to light emanating from said data so as to provide a stored charge pattern on said semiconductor, and applying r.f. power to said semiconductor at the same time that a second magnetic field, opposite to said first direction, is applied to said magnetic film whereby the heat generated by said r.f. power in accordance with charge pattern raises the temperature of the magnetic film above its Curie point so that a magnetic image of said data is stored in said magnetic recording element.
Claim 13
Dependent Claim
143 words
In a method of photocopying data onto a magnetic recording element comprising the steps of providing a field-effect controlled semiconductor in contact with a heat-sensitive magnetic film maintained below its Curie point, uniformly magnetizing said film in a first direction, uniformly charging said semiconductor with a negative charge while maintaining said semiconductor in the dark, exposing said field-effect controlled semiconductor to light emanating from said data so as to provide a stored charge pattern on said semiconductor, and applying r.f. power to said semiconductor at the same time that a second magnetic field, opposite to said first direction, is applied to said magnetic film whereby the heat generated by said r.f. power in accordance with charge pattern raises the temperature of the magnetic film above its Curie point so that a magnetic image of said data is stored in said magnetic recording element.
Claim 14
Dependent Claim
13 words
In a method of claim 7 wherein said magnetic recording element is EuO.
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |