US5315356A
Expired / Lapsed
US
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Fixing apparatus
Assignee: Toshiba Corp
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Filing: 1993-06-11
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Granted: 1994-05-24
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Expires: 2013-06-11
Abstract
Abstract A fixing apparatus, for fixing a toner on a recording material by using Joule heat which is generated by applying a voltage across the conductors or across the electrodes to supply a current mostly to a fixing portion, (I) comprises a heating device having a first conductive layer, a pressure-sensitive conductive resin layer which is formed on the first conductive layer, and a second conductive layer formed on the pressure-sensitive conductive resin layer, (II) comprises a heating device having a first conductor and a fixing sheet substantially made of a pressure-sensitive conductive resin layer and a second conductive layer, or (III) comprises a heating device having a fixing sheet made of a heat-generating resistor and first and second electrodes insulated from each other.
Inventors
- 👤 Hitoshi Nagato
- 👤 Yuzo Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:14
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2064
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A fixing apparatus comprising: a heat roller having a first conductor, a pressure-sensitive conductive resin layer which is formed on said first conductor and in which a volume resistivity of a pressed area becomes lower than that of a non-pressed area, and a second conductive layer formed on said pressure-sensitive conductive resin layer; and current supplying means for supplying a current to a low-resistance pressed area of said pressure-sensitive conductive resin layer by applying a voltage across said first and second conductive layers, wherein a non-fixed toner image on a recording material partially pressed against said heat roller is fixed by using Joule heat generated by flowing of the current.
Claim 2
Dependent Claim
110 words
A fixing apparatus comprising: a heat roller having a first conductor, a pressure-sensitive conductive resin layer which is formed on said first conductor and in which a volume resistivity of a pressed area becomes lower than that of a non-pressed area, and a second conductive layer formed on said pressure-sensitive conductive resin layer; and current supplying means for supplying a current to a low-resistance pressed area of said pressure-sensitive conductive resin layer by applying a voltage across said first and second conductive layers, wherein a non-fixed toner image on a recording material partially pressed against said heat roller is fixed by using Joule heat generated by flowing of the current.
Claim 3
Dependent Claim
18 words
An apparatus according to claim 1, wherein a pressure-sensitive conductive rubber is used as said pressure-sensitive conductive resin.
Claim 4
Dependent Claim
17 words
An apparatus according to claim 1, wherein said first conductor has a core or hollow roll shape.
Claim 5
Dependent Claim
25 words
An apparatus according to claim 1, wherein said second conductive layer comprises a metal layer formed on said pressure-sensitive conductive resin layer by vapor deposition.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1, wherein said second conductive layer comprises a conductive composition coating formed on said pressure-sensitive conductive resin layer.
Claim 7
Dependent Claim
24 words
An apparatus according to claim 1, wherein the volume resistivity when pressed is between 1/10 and 1/10 6 of the volume resistivity when non-pressed.
Claim 8
Dependent Claim
30 words
An apparatus according to claim 1, wherein the volume resistivity when pressed is measured when said pressure-sensitive conductive resin layer is pressed with a pressure of 2 kg/cm 2 .
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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) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |