US4482239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image recorder with microwave fixation
Assignee: Canon Inc
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Filing: 1982-04-19
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Granted: 1984-11-13
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Expires: 2002-04-19
Abstract
Abstract The present invention is directed to improvement in an image recorder for recording developed images or toner images by microwave fixation. According to the invention there is used a novel thermoplastic developer comprising of two components. The first component contains a dielectric material which is able to absorb microwave and generate heat by dielectric loss. The second component contains magnetic loss exothermic material. The microwave absorbing power of the first component is improved by heating the first component with heat generated from the second component.
Inventors
- 👤 Nagao Hosono
- 👤 Kazuo Isaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
141 words
An image recording apparatus with microwave fixation comprising: means for forming a developed image on a recording material, said developed image being formed by a thermoplastic developer having a mixture of a first component and a second component, said first component being a dielectric material having the property of increasing microwave absorption efficiency as the temperature of said first component increases and capable of generating heat by dielectric loss when microwave energy is absorbed, said second component being a magnetic material capable of generating heat by magnetic loss so as to heat said first component to advance the microwave absorption efficiency of said first component and to concentrate the microwave energy itself on said developed image; and means for applying microwave energy to the recording material bearing said developed image and for microwave fixing said developed image onto said recording material.
Claim 2
Dependent Claim
141 words
An image recording apparatus with microwave fixation comprising: means for forming a developed image on a recording material, said developed image being formed by a thermoplastic developer having a mixture of a first component and a second component, said first component being a dielectric material having the property of increasing microwave absorption efficiency as the temperature of said first component increases and capable of generating heat by dielectric loss when microwave energy is absorbed, said second component being a magnetic material capable of generating heat by magnetic loss so as to heat said first component to advance the microwave absorption efficiency of said first component and to concentrate the microwave energy itself on said developed image; and means for applying microwave energy to the recording material bearing said developed image and for microwave fixing said developed image onto said recording material.
Claim 3
Dependent Claim
42 words
An image forming apparatus as set forth in claim 1, wherein said microwave fixing means includes means for generating microwave radiation of higher frequency than 1 MHz and means for applying said generated microwave radiation to said recording material and developed image.
Claim 4
Dependent Claim
28 words
An image forming apparatus as set forth in claim 2, wherein said microwave fixing means further includes means for absorbing the microwave radiation passed over said application means.
Claim 5
Dependent Claim
18 words
An image forming apparatus as set forth in claim 1, wherein said second component is a magnetic powder.
Claim 6
Dependent Claim
22 words
An image forming apparatus as set forth in claim 4, wherein the particle size of said magnetic powder is less than 1μ.
Claim 7
Dependent Claim
18 words
An image forming apparatus as set forth in claim 5, wherein the particle size is less than 0.1μ.
Claim 8
Dependent Claim
37 words
An image forming apparatus as set forth in any of claims 4, 5 and 6, wherein the value of μ"r of said magnetic powder is above 0.1 wherein μ"r is the imaginary portion of complex relative permeability.
Claim 9
Dependent Claim
18 words
An image forming apparatus as set forth in claim 7, wherein the value of μ"r is above 1.
Claim 10
Dependent Claim
31 words
An image forming apparatus as set forth in claim 4, wherein the content of said magnetic powder is in the range of from 20 to 80% by weight of the developer.
Claim 11
Dependent Claim
31 words
An image forming apparatus as set forth in claim 9, wherein the content of said magnetic powder is in the range of from 30 to 60% by weight of the developer.
Claim 12
Dependent Claim
24 words
An image forming apparatus as set forth in claim 9 or 10, wherein the particle size of said magnetic powder is less than 1μ.
Claim 13
Dependent Claim
22 words
An image forming apparatus as set forth in claim 11, wherein the particle size of said magnetic powder is less than 0.1μ.
Claim 14
Dependent Claim
22 words
An image forming apparatus as set forth in claim 11, wherein the value of μ"r of said magnetic powder is above 0.1.
Claim 15
Dependent Claim
22 words
An image forming apparatus as set forth in claim 13, wherein the value of μ"r of said magnetic powder is above 1.
Claim 16
Dependent Claim
22 words
An image forming apparatus as set forth in claim 12, wherein the value of μ"r of said magnetic powder is above 0.1.
Claim 17
Dependent Claim
22 words
An image forming apparatus as set forth in claim 15, wherein the value of μ"r of said magnetic powder is above 1.
Claim 18
Dependent Claim
19 words
An image forming apparatus as set forth in claim 1 or 4, wherein said first component is dielectric material.
Claim 19
Dependent Claim
22 words
An image forming apparatus as set forth in claim 17, wherein the relative dielectric constant of said first component is above 3.
Claim 20
Dependent Claim
22 words
An image forming apparatus as set forth in claim 18, wherein the relative dielectric constant of said first component is above 4.
Claim 21
Dependent Claim
27 words
An image forming apparatus as set forth in claim 17, wherein said first component is such material whose value of relative dielectric constant/relative permeability is above 3.
Claim 22
Dependent Claim
27 words
An image forming apparatus as set forth in claim 20, wherein said first component is such material whose value of relative dielectric constant/relative permeability is above 4.
Claim 23
Dependent Claim
27 words
An image forming apparatus as set forth in claim 1 or 4, wherein said second component is dielectric material and its dielectric loss εrtanδ is above 0.03.
Claim 24
Dependent Claim
22 words
An image forming apparatus as set forth in claim 22, wherein the dielectric loss εrtanδ of said second component is above 0.1.
Claim 25
Dependent Claim
25 words
An image forming apparatus as set forth in claim 17, wherein said second component is dielectric material and its dielectric loss εrtanδ is above 0.03.
Claim 26
Dependent Claim
22 words
An image forming apparatus as set forth in claim 24, wherein the dielectric loss εrtanδ of said second component is above 0.1.
Claim 27
Dependent Claim
60 words
An image recording apparatus according to claim 1, 5 or 9 wherein said microwave fixing means comprises a dielectric base, a conductor for concentratingly propagating microwave disposed on the surface of said base along the direction intersecting the direction transmiting the recording material, and means for transmitting the recording material in contact with or in the vicinity of said conductor.
Claim 28
Dependent Claim
47 words
A recording apparatus according to claim 1, wherein said thermoplastic developer includes as said second component fine particles of more than 20 percent by weight of magnetic material having particle size of less then 1μ and imaginary part of complex relative permeability μ" of more than 0.1.
References Cited (Backward Citations)
US3851132A
Cited
US4202618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |