Patent US5767484A successfully refreshed from Google Patents.
US5767484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image fixing heater and image fixing apparatus having same
Assignee: Canon Inc
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Filing: 1996-08-02
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Granted: 1998-06-16
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Expires: 2016-08-02
Abstract
Abstract An image forming apparatus contains a heater and a sheet movable with a recording material in sliding contact with the heater, wherein the image is heated by heat from the heater through the sheet. The heater has an electrically insulative member, a heat generating resistor arranged on the electrically insulative member in a direction crossing with a movement direction of the sheet, an electrode for supplying electric power to the resistor and a protection layer covering the heat generating resistors, and in sliding contact with the sheet.
Inventors
- 👤 Hiromitsu Hirabayashi
- 👤 Kensaku Kusaka
- 👤 Atsushi Arai
- 👤 Yoshiaki Takayanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:00
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2009; G03G2215/2016; G03G2215/2022; G03G2215/2035; G03G2215/2038
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
An image fixing apparatus, comprising: a heater; a sheet in sliding contact with said heater and movable in contact with and together with a recording material carrying an unfixed image, wherein the unfixed image is heated by heat from said heater; wherein said heater comprises an electrically insulative member, a heat generating resistor arranged on said electrically insulative member in a direction crossing with a movement direction of said sheet, an electrode for supplying electric power to said heat generating resistor, and a protection layer covering said heat generating resistor and in sliding contact with said sheet, wherein said protection layer is convex outwardly with respect to the movement direction.
Claim 2
Dependent Claim
110 words
An image fixing apparatus, comprising: a heater; a sheet in sliding contact with said heater and movable in contact with and together with a recording material carrying an unfixed image, wherein the unfixed image is heated by heat from said heater; wherein said heater comprises an electrically insulative member, a heat generating resistor arranged on said electrically insulative member in a direction crossing with a movement direction of said sheet, an electrode for supplying electric power to said heat generating resistor, and a protection layer covering said heat generating resistor and in sliding contact with said sheet, wherein said protection layer is convex outwardly with respect to the movement direction.
Claim 3
Dependent Claim
13 words
An apparatus according to claim 1, wherein said insulative member is of alumina.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 1, further comprising a back-up member for forming a nip with said heater with said sheet therebetween.
Claim 5
Dependent Claim
19 words
An apparatus according to claim 1, further comprising a temperature detecting element for detecting temperature of said insulative member.
Claim 6
Dependent Claim
23 words
An image fixing heater according to claim 1, wherein said protection layer is projected most at a portion of said heat generating resistor.
Claim 7
Dependent Claim
73 words
An image fixing heater, comprising: an electrically insulative plate; a heat generating resistor arranged on said electrically insulative plate in a longitudinal direction of said electrically insulative plate; an electrode for supplying electric power to said heat generating resistor; and a protection layer covering said heat generating resistor, wherein said protection layer is convex outwardly with respect to a direction perpendicular to the longitudinal direction and said electrically insulative plate is of alumina.
Claim 8
Dependent Claim
73 words
An image fixing heater, comprising: an electrically insulative plate; a heat generating resistor arranged on said electrically insulative plate in a longitudinal direction of said electrically insulative plate; an electrode for supplying electric power to said heat generating resistor; and a protection layer covering said heat generating resistor, wherein said protection layer is convex outwardly with respect to a direction perpendicular to the longitudinal direction and said electrically insulative plate is of alumina.
Claim 9
Dependent Claim
23 words
An image fixing heater according to claim 6, wherein said protection layer is projected most at a portion of said heat generating resistor.
Claim 10
Dependent Claim
77 words
An image fixing heater, comprising: an electrically insulative plate; a heat generating resistor arranged on said electrically insulative plate in a longitudinal direction of said electrically insulative plate; an electrode for supplying electric power to said heat generating resistor; a protection layer covering said heat generating resistor, wherein said protection layer is convex outwardly with respect to a direction perpendicular to the longitudinal direction; and a temperature detecting element for detecting temperature of said electrically insulative plate.
Claim 11
Dependent Claim
77 words
An image fixing heater, comprising: an electrically insulative plate; a heat generating resistor arranged on said electrically insulative plate in a longitudinal direction of said electrically insulative plate; an electrode for supplying electric power to said heat generating resistor; a protection layer covering said heat generating resistor, wherein said protection layer is convex outwardly with respect to a direction perpendicular to the longitudinal direction; and a temperature detecting element for detecting temperature of said electrically insulative plate.
Claim 12
Dependent Claim
23 words
An image fixing heater according to claim 8, wherein said protection layer is projected most at a portion of said heat generating resistor.
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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) | 2001-06-15 | 2001-12-15 | 2002-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-15 | 2005-12-15 | 2006-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-15 | 2009-12-15 | 2010-06-16 | $7700.00 | Window Closed / Lapsed |