US6405014B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing device for fixing a developer image on a recording medium by induction-heating a heat roller
Assignee: Toshiba Tec Corp
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Filing: 2001-08-28
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Granted: 2002-06-11
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Expires: 2021-08-28
Abstract
Abstract A high-frequency current is supplied from a high-frequency generating circuit to a coil of a heat roller, and a high-frequency magnetic field is generated from the coil. The high-frequency magnetic field causes an eddy current to be generated in the heat roller, and a developer image on a recording medium is fixed by self-generation of heat of the heating roller based on an eddy-current loss. Electric wires between the high-frequency generating circuit and the coil are electrically shielded by a shield member.
Inventors
- 👤 Kenji Takano
- 👤 Taizo Kimoto
- 👤 Noiryuki Umezawa
- 👤 Hisaaki Kawano
- 👤 Hiroshi Nakayama
- 👤 Osamu Takagi
- 👤 Satoshi Kinouchi
- 👤 Kazuhiko Kikuchi
- 👤 Masahiko Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:52
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/14; H05B6/145; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A fixing device having a coil in a heat roller, causing the coil to generate a high-frequency magnetic field, thereby generating an eddy current in the heat roller, and fixing a developer image on a recording medium by self-generation of heat of the heat roller based on an eddy-current loss, said fixing device comprising: a high-frequency generating circuit which outputs a high-frequency current to generate a high-frequency magnetic field from the coil; an electric wire which supplies the output of the high-frequency generating circuit to the coil, the electric wire being connected between the high-frequency generating circuit and the coil; and a shield member which magnetically shields the electric wire, the shield member entirely surrounding the electric wire and keeping a predetermined distance from the electric wire.
Claim 2
Dependent Claim
127 words
A fixing device having a coil in a heat roller, causing the coil to generate a high-frequency magnetic field, thereby generating an eddy current in the heat roller, and fixing a developer image on a recording medium by self-generation of heat of the heat roller based on an eddy-current loss, said fixing device comprising: a high-frequency generating circuit which outputs a high-frequency current to generate a high-frequency magnetic field from the coil; an electric wire which supplies the output of the high-frequency generating circuit to the coil, the electric wire being connected between the high-frequency generating circuit and the coil; and a shield member which magnetically shields the electric wire, the shield member entirely surrounding the electric wire and keeping a predetermined distance from the electric wire.
Claim 3
Dependent Claim
34 words
The device according to claim 1 , wherein the shield member has a structure that does not easily generate an eddy current even when it receives a magnetic field generated from the electric wire.
Claim 4
Dependent Claim
29 words
The device according to claim 2 , wherein the shield member has a cylindrical shape surrounding the electric wire and having a number of holes in its side surface.
Claim 5
Dependent Claim
29 words
The device according to claim 2 , wherein the shield member has a cylindrical shape surrounding the electric wire and having a side surface made of a mesh member.
Claim 6
Dependent Claim
15 words
The device according to claim 2 , wherein the shield member is made of ferrite.
Claim 7
Dependent Claim
23 words
The device according to claim 1 , wherein the high-frequency generating circuit outputs a high-frequency current of a frequency other than 40 KHz.
Claim 8
Dependent Claim
33 words
The device according to claim 1 , wherein the electric wire has a length shorter than a predetermined length based on a frequency of the high-frequency current output from the high-frequency generating circuit.
Claim 9
Dependent Claim
59 words
The device according to claim 1 , wherein the high-frequency generating circuit comprises a rectifying circuit which rectifies an AC power source voltage and a switching circuit which converts an output voltage of the rectifying circuit to a high-frequency voltage of a predetermined frequency, the switching circuit being magnetically shielded by the shield member along with the electric wire.
Claim 10
Dependent Claim
121 words
A fixing device having a coil in a heat roller, causing the coil to generate a high-frequency magnetic field, thereby generating an eddy current in the heat roller, and fixing a developer image on a recording medium by self-generation of heat of the heat roller based on an eddy-current loss, said fixing device comprising: a high-frequency generating circuit which outputs a high-frequency current to generate a high-frequency magnetic field from the coil, said high-frequency generating circuit comprising a rectifying circuit which rectifies an AC power source voltage and a switching circuit which converts an output voltage of the rectifying circuit to a high-frequency voltage of a predetermined frequency, the switching circuit being contained in the heat roller together with the coil.
Claim 11
Dependent Claim
121 words
A fixing device having a coil in a heat roller, causing the coil to generate a high-frequency magnetic field, thereby generating an eddy current in the heat roller, and fixing a developer image on a recording medium by self-generation of heat of the heat roller based on an eddy-current loss, said fixing device comprising: a high-frequency generating circuit which outputs a high-frequency current to generate a high-frequency magnetic field from the coil, said high-frequency generating circuit comprising a rectifying circuit which rectifies an AC power source voltage and a switching circuit which converts an output voltage of the rectifying circuit to a high-frequency voltage of a predetermined frequency, the switching circuit being contained in the heat roller together with the coil.
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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) | 2005-06-10 | 2005-12-10 | 2006-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-10 | 2009-12-10 | 2010-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-10 | 2013-12-10 | 2014-06-11 | $7700.00 | Window Closed / Lapsed |