EP0370520A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An image fixing apparatus
Assignee: Canon Inc
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Filing: 1989-11-24
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Granted: —
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Expires: 2009-11-24
Abstract
Abstract An image fixing apparatus (20) including a heater (21) having a linear heat generating layer (28); a film (23) movable together with a recording medium (P) carrying thereon a toner image which is heated by heat generated by the heat generating layer (28) through the film (23); energizing device for pulsewisely energizing the heat generating layer (28) and for controlling a pulse width of the pulsewise energization in accordance with a voltage level of power supplied thereto.
Inventors
- 👤 Shokyo Canon-Ryo Koh
- 👤 Yoshihiko Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 17:26
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
69 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer; a film movable together with a recording medium carrying thereon a toner image which is heated by heat generated by said heat generating layer through said film; energizing means for pulsewisely energizing said heat generating layer and for controlling a pulse width of the pulsewise energization in accordance with a voltage level of power supplied thereto.
Claim 2
Dependent Claim
69 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer; a film movable together with a recording medium carrying thereon a toner image which is heated by heat generated by said heat generating layer through said film; energizing means for pulsewisely energizing said heat generating layer and for controlling a pulse width of the pulsewise energization in accordance with a voltage level of power supplied thereto.
Claim 3
Dependent Claim
24 words
An apparatus according to Claim 1, wherein further comprising pressing means for imparting urging force among said heater, said film and the recording material.
Claim 4
Dependent Claim
25 words
An apparatus according to Claim 1, wherein said heat generating layer extends in a direction substantially perpendicular to a movement direction of said recording material.
Claim 5
Dependent Claim
22 words
An apparatus according to Claim 1, wherein said energizing means includes limiting means for limiting a pulse width of the pulsewise energization.
Claim 6
Dependent Claim
28 words
An apparatus according to Claim 1, wherein the pulse width is determined by a resistor, a capacitor and a reference voltage source in accordance with a pulse signal.
Claim 7
Dependent Claim
35 words
An apparatus according to Claim 1, wherein said energizing means controls the pulse width so as to make the power supplied to said heat generating layer substantially constant irrespective of the voltage level supplied thereto.
Claim 8
Dependent Claim
22 words
An apparatus according to Claim 1, wherein said heater is fixed during its fixing operation, and said film slides on said heater.
Claim 9
Dependent Claim
25 words
An apparatus according to Claim 2, wherein during a fixing operation, there is no air layer between said heat generating layer and the toner image.
Claim 10
Dependent Claim
73 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heat generating layer through said film; energizing means for pulsewisely energizing said heat generating layer; adjusting means for adjusting a pulse width of the pulsewise energization, wherein the pulse width is constant irrespective of a temperature of said heater.
Claim 11
Dependent Claim
73 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heat generating layer through said film; energizing means for pulsewisely energizing said heat generating layer; adjusting means for adjusting a pulse width of the pulsewise energization, wherein the pulse width is constant irrespective of a temperature of said heater.
Claim 12
Dependent Claim
23 words
An apparatus according to Claim 9, wherein said pulse width is adjusted in accordance with a resistance level of said heat generating layer.
Claim 13
Dependent Claim
24 words
An apparatus according to Claim 9, wherein further comprising pressing means for imparting urging force among said heater, said film and the recording material.
Claim 14
Dependent Claim
25 words
An apparatus according to Claim 11, wherein during a fixing operation, there is no air layer between said heat generating layer and the toner image.
Claim 15
Dependent Claim
25 words
An apparatus according to Claim 9, wherein said heat generating layer extends in a direction substantially perpendicular to a movement direction of said recording material.
Claim 16
Dependent Claim
22 words
An apparatus according to Claim 9, wherein said heater is fixed during its fixing operation, and said film slides on said heater.
Claim 17
Dependent Claim
32 words
An apparatus according to Claim 9, wherein said adjusting means includes a variable resistor, and wherein the pulse width of the energization is adjusted by changing the resistance of the variable resistor.
Claim 18
Dependent Claim
80 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heat generating layer through said film; energizing means for pulsewisely energizing said heat generating layer; temperature detecting means for detecting a temperature of said heater; wherein said energizing means controls a period of the energization pulse in accordance with an output of said temperature detecting means.
Claim 19
Dependent Claim
80 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heat generating layer through said film; energizing means for pulsewisely energizing said heat generating layer; temperature detecting means for detecting a temperature of said heater; wherein said energizing means controls a period of the energization pulse in accordance with an output of said temperature detecting means.
Claim 20
Dependent Claim
24 words
An apparatus according to Claim 16, wherein further comprising pressing means for imparting urging force among said heater, said film and the recording material.
Claim 21
Dependent Claim
25 words
An apparatus according to Claim 17, wherein during a fixing operation, there is no air layer between said heat generating layer and the toner image.
Claim 22
Dependent Claim
25 words
An apparatus according to Claim 16, wherein said heat generating layer extends in a direction substantially perpendicular to a movement direction of said recording material.
Claim 23
Dependent Claim
22 words
An apparatus according to Claim 16, wherein said heater is fixed during its fixing operation, and said film slides on said heater.
Claim 24
Dependent Claim
17 words
An apparatus according to Claim 16, wherein said energizing means controls a width of the pulsewise energization.
Claim 25
Dependent Claim
24 words
An apparatus according to Claim 21, wherein the width of the pulsewise energization is controlled in accordance with variation of a voltage supplied thereto.
Claim 26
Dependent Claim
40 words
An apparatus according to Claim 16, wherein a conveying speed Vp of the recording material, a width d of said heat generating layer and energization period Tmax in which a minimum energy is supplied, satisfy: Vp x Tmax ≦ d.
Claim 27
Dependent Claim
70 words
An image fixing apparatus, comprising: a heater; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heater through said film; energizing means for pulsewisely energizing said heater; and shutting means for shutting power supply to said heater by said energizing means, wherein said shutting means shuts the power supply to said heater in accordance with pulsewise energization time.
Claim 28
Dependent Claim
70 words
An image fixing apparatus, comprising: a heater; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heater through said film; energizing means for pulsewisely energizing said heater; and shutting means for shutting power supply to said heater by said energizing means, wherein said shutting means shuts the power supply to said heater in accordance with pulsewise energization time.
Claim 29
Dependent Claim
13 words
An apparatus according to Claim 24, wherein the pulsewise energization time is variable.
Claim 30
Dependent Claim
35 words
An apparatus according to Claim 25, further comprising temperature detecting means for detecting a temperature of said heater, and the energization pulse time is changed in accordance with an output of said temperature detecting means.
Claim 31
Dependent Claim
34 words
An apparatus according to Claim 24, wherein said shutting means is disposed in a power supply passage by said energizing means to said heater, and it shuts the power supply by opening the passage.
Claim 32
Dependent Claim
15 words
An apparatus according to Claim 24, wherein said heater includes a linear heat generating layer.
Claim 33
Dependent Claim
24 words
An apparatus according to Claim 28, wherein further comprising pressing means for imparting urging force among said heater, said film and the recording material.
Claim 34
Dependent Claim
25 words
An apparatus according to Claim 24, wherein during a fixing operation, there is no air layer between said heat generating layer and the toner image.
Claim 35
Dependent Claim
25 words
An apparatus according to Claim 24, wherein said heat generating layer extends in a direction substantially perpendicular to a movement direction of said recording material.
Claim 36
Dependent Claim
22 words
An apparatus according to Claim 28, wherein said heater is fixed during its fixing operation, and said film slides on said heater.
Claim 37
Dependent Claim
22 words
An apparatus according to Claim 24, wherein said shutting means shuts the energization when the pulse energization time exceeds a predetermined level.
Claim 38
Dependent Claim
24 words
An apparatus according to Claim 24, wherein said shutting means includes a fuse which blows out when a current therethrough exceeds a predetermined level.
Claim 39
Dependent Claim
67 words
An image fixing apparatus, comprising: a heater; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heater through said film; energizing means for pulsewisely energizing said heater; shutting means for shutting energization to said heater from said energizing means; wherein said shutting means shuts the energization to said heater in accordance with a pulse period.
Claim 40
Dependent Claim
67 words
An image fixing apparatus, comprising: a heater; a film movable together with a recording material carrying thereon a toner image which is heated by heat generated by said heater through said film; energizing means for pulsewisely energizing said heater; shutting means for shutting energization to said heater from said energizing means; wherein said shutting means shuts the energization to said heater in accordance with a pulse period.
Claim 41
Dependent Claim
22 words
An apparatus according to Claim 35, wherein said shutting means shuts energization in accordance with a duty ratio of the pulsewise energization.
Claim 42
Dependent Claim
21 words
An apparatus according to Claim 35, wherein said shutting means shuts the energization when the duty ratio exceeds a predetermined level.
Claim 43
Dependent Claim
34 words
An apparatus according to Claim 35, wherein said shutting means is disposed in a power supply passage by said energizing means to said heater, and it shuts the power supply by opening the passage.
Claim 44
Dependent Claim
15 words
An apparatus according to Claim 35, wherein said heater includes a linear heat generating layer.
Claim 45
Dependent Claim
24 words
An apparatus according to Claim 39, wherein further comprising pressing means for imparting urging force among said heater, said film and the recording material.
Claim 46
Dependent Claim
25 words
An apparatus according to Claim 35, wherein during a fixing operation, there is no air layer between said heat generating layer and the toner image.
Claim 47
Dependent Claim
25 words
An apparatus according to Claim 35, wherein said heat generating layer extends in a direction substantially perpendicular to a movement direction of said recording material.
Claim 48
Dependent Claim
22 words
An apparatus according to Claim 39, wherein said heater is fixed during its fixing operation, and said film slides on said heater.
Claim 49
Dependent Claim
24 words
An apparatus according to Claim 37, wherein said shutting means includes a fuse which blows out when a current therethrough exceeds a predetermined level.
References Cited (Backward Citations)
No citation records indexed.
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