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US6495810B2
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US
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Fixing device using induction heating as a heating source
Assignee: Toshiba Corp
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Filing: 2001-08-28
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Granted: 2002-12-17
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Expires: 2021-08-28
Abstract
Abstract A fixing device comprising an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed, an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member, and an AC power supply circuit supplying an AC current to the electromagnetic inductive coil member. The coil member is constructed such that in a state where the coil member is positioned in the fixing device, a ratio between an inductance L of the coil member and a load resistance R of the coil member meets a condition of L/R<50×10 −6 (H/Ω).
Inventors
- 👤 Osamu Takagi
- 👤 Satoshi Kinouchi
- 👤 Kazuhiko Kikuchi
- 👤 Hisaaki Kawano
- 👤 Hiroshi Nakayama
- 👤 Kenji Takano
- 👤 Taizo Kimoto
- 👤 Noriyuki Umezawa
- 👤 Masahiko Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:15
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/14; H05B6/145
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
130 words
A fixing device comprising: an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed; an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member; and an AC power supply circuit supplying an AC current to said coil member, wherein said coil member is constructed such that in a state where said coil member is positioned in the fixing device, a ratio between an inductance L of said coil member and a load resistance R of said coil member meets a condition of: L/R<50×10 −6 (H/Ω), and wherein said coil member comprises a non-magnetic coil-supporting member, and a coil supported by said non-magnetic coil-supporting member.
Claim 2
Dependent Claim
130 words
A fixing device comprising: an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed; an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member; and an AC power supply circuit supplying an AC current to said coil member, wherein said coil member is constructed such that in a state where said coil member is positioned in the fixing device, a ratio between an inductance L of said coil member and a load resistance R of said coil member meets a condition of: L/R<50×10 −6 (H/Ω), and wherein said coil member comprises a non-magnetic coil-supporting member, and a coil supported by said non-magnetic coil-supporting member.
Claim 3
Dependent Claim
19 words
The fixing device according to claim 1 , wherein said AC power supply circuit comprises an inverter driving circuit.
Claim 4
Dependent Claim
22 words
The fixing device according to claim 1 , wherein said endless heating member has a thickness ranging from 0.1 to 10 mm.
Claim 5
Dependent Claim
24 words
The fixing device according to claim 1 , wherein said endless heating member is cylindrical having a diameter ranging from 20 to 60 mm.
Claim 6
Dependent Claim
29 words
The fixing device according to claim 1 , wherein a gap between said endless heating member and said coil member is in the range of 1 to 4 mm.
Claim 7
Dependent Claim
21 words
The fixing device according to claim 1 , wherein said AC current has a frequency ranging from 20 to 50 kHz.
Claim 8
Dependent Claim
28 words
The fixing device according to claim 1 , wherein said endless heating member is constituted by a material having a relative magnetic permeability of not more than 200.
Claim 9
Dependent Claim
35 words
The fixing device according to claim 1 , wherein said endless heating member comprises material selected from the group consisting of iron, stainless steel, aluminum and a composite material consisting of stainless steal and aluminum.
Claim 10
Dependent Claim
19 words
The fixing device according to claim 1 , wherein said non-magnetic coil-supporting member is formed of a heat-resistant resin.
Claim 11
Dependent Claim
168 words
A fixing device comprising an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed; an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member; and an inverter driving circuit supplying an AC current to the electromagnetic inductive coil member; wherein said coil member is constructed such that in a state where said coil member is positioned in the fixing device, a ratio between an inductance L of said coil member and a load resistance R of said coil member meets a formula of: L/R<50×10 −6 (H/Ω), and said inductance L and said load resistance R meet a formula of: V 2 /[(2πfL) 2 +R 2 ] {fraction (−1/2)} >600 under conditions where a supply voltage of the inverter driving circuit is in the range of 100 to 250 V, and a frequency thereof is in the range of 20 to 50 kHz.
Claim 12
Dependent Claim
168 words
A fixing device comprising an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed; an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member; and an inverter driving circuit supplying an AC current to the electromagnetic inductive coil member; wherein said coil member is constructed such that in a state where said coil member is positioned in the fixing device, a ratio between an inductance L of said coil member and a load resistance R of said coil member meets a formula of: L/R<50×10 −6 (H/Ω), and said inductance L and said load resistance R meet a formula of: V 2 /[(2πfL) 2 +R 2 ] {fraction (−1/2)} >600 under conditions where a supply voltage of the inverter driving circuit is in the range of 100 to 250 V, and a frequency thereof is in the range of 20 to 50 kHz.
Claim 13
Dependent Claim
75 words
The fixing device according to claim 10 , wherein said coil member is constructed such that an electric current I which is represented by a formula of: I=(V/R)(1−e −1/f/L/R ) meets a withstanding current of switching element of the inverter driving circuit under conditions where a supply voltage of the inverter driving circuit is in the range of 100 to 250 V, and a frequency thereof is in the range of 20 to 50 kHz.
Claim 14
Dependent Claim
22 words
The fixing device according to claim 10 , wherein said endless heating member has a thickness ranging from 0.1 to 10 mm.
Claim 15
Dependent Claim
24 words
The fixing device according to claim 10 , wherein said endless heating member is cylindrical having a diameter ranging from 20 to 60 mm.
Claim 16
Dependent Claim
29 words
The fixing device according to claim 10 , wherein a gap between said endless heating member and said coil member is in the range of 1 to 4 mm.
Claim 17
Dependent Claim
21 words
The fixing device according to claim 10 , wherein said AC current has a frequency ranging from 20 to 50 kHz.
Claim 18
Dependent Claim
28 words
The fixing device according to claim 10 , wherein said endless heating member is constituted by a material having a relative magnetic permeability of not more than 200.
Claim 19
Dependent Claim
36 words
The fixing device according to claim 10 , wherein said endless heating member comprises a material selected from the group consisting of iron, stainless steel, aluminum and a composite material consisting of stainless steal and aluminum.
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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) | 2005-12-16 | 2006-06-17 | 2006-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-12-16 | 2010-06-17 | 2010-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-12-16 | 2014-06-17 | 2014-12-17 | $7700.00 | Window Closed / Lapsed |