US5148226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus using endless film
Assignee: Canon Inc
•
Filing: 1992-01-21
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Granted: 1992-09-15
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Expires: 2012-01-21
Abstract
Abstract An image heating apparatus includes a heater; a film movable together with a recording material; a driving rotatable member cooperative with the film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from the heater through the film; wherein the driving member has a circumferential length which increases toward longitudinal ends thereof.
Inventors
- 👤 Takeshi Setoriyama
- 👤 Akira Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:19
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G15/2039; G03G15/2042; G03G15/2053; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2035; G03G2215/2058; G03G2215/2061
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
64 words
An image heating apparatus, comprising: a heater; a film movable together with a recording material; a driving rotatable member cooperative with said film to form a nip therebetween, whereby an image on the recording material being passed through the nip is heated by heat from said heater through said film; wherein said driving member has a circumferential length which increases toward longitudinal ends thereof.
Claim 2
Dependent Claim
64 words
An image heating apparatus, comprising: a heater; a film movable together with a recording material; a driving rotatable member cooperative with said film to form a nip therebetween, whereby an image on the recording material being passed through the nip is heated by heat from said heater through said film; wherein said driving member has a circumferential length which increases toward longitudinal ends thereof.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 1, wherein said heater is stationary in use, and said film is slidable relative to said heater.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 1, wherein said driving member is in the form of a roller having a diameter increasing toward longitudinal ends thereof.
Claim 5
Dependent Claim
17 words
An apparatus according to claim 1, wherein said film has a thickness not more than 100 microns.
Claim 6
Dependent Claim
17 words
An apparatus according to claim 4, wherein said film has a thickness not more than 40 microns.
Claim 7
Dependent Claim
17 words
An apparatus according to claim 1, wherein said film is in the form of an endless belt.
Claim 8
Dependent Claim
20 words
An apparatus according to claim 1, wherein said film comprises resin material, and said driving member has a surface layer.
Claim 9
Dependent Claim
20 words
An apparatus according to claim 3, wherein a difference between a maximum diameter and a minimum diameter is 200-400 microns.
Claim 10
Dependent Claim
89 words
An image heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a driving rotatable member cooperative with said film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from said heater through said film; a feeding rotatable member for feeding the recording material passed through the nip; wherein a first peripheral speed of said feeding rotatable member is smaller than a second peripheral speed of said driving member.
Claim 11
Dependent Claim
89 words
An image heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a driving rotatable member cooperative with said film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from said heater through said film; a feeding rotatable member for feeding the recording material passed through the nip; wherein a first peripheral speed of said feeding rotatable member is smaller than a second peripheral speed of said driving member.
Claim 12
Dependent Claim
17 words
An apparatus according to claim 9, wherein said film has a thickness not more than 100 microns.
Claim 13
Dependent Claim
17 words
An apparatus according to claim 10, wherein said film has a thickness not more than 40 microns.
Claim 14
Dependent Claim
17 words
An apparatus according to claim 9, wherein said film is in the form of an endless belt.
Claim 15
Dependent Claim
16 words
An apparatus according to claim 9, wherein a difference between the two peripheral speeds is 1-3%.
Claim 16
Dependent Claim
29 words
An apparatus according to claim 9, wherein said feeding rotatable member is disposed downstream of said driving rotatable member and functions to discharge the recording material outside said apparatus.
Claim 17
Dependent Claim
79 words
An image heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a driving rotatable member cooperative with said film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from said heater through said film; wherein a friction coefficient between said film and said driving rotatable member is larger than a friction coefficient between said film and said heater.
Claim 18
Dependent Claim
79 words
An image heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a driving rotatable member cooperative with said film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from said heater through said film; wherein a friction coefficient between said film and said driving rotatable member is larger than a friction coefficient between said film and said heater.
Claim 19
Dependent Claim
17 words
An apparatus according to claim 15, wherein said film has a thickness not more than 100 microns.
Claim 20
Dependent Claim
17 words
An apparatus according to claim 16, wherein said film has a thickness not more than 40 microns.
Claim 21
Dependent Claim
17 words
An apparatus according to claim 15, wherein said film is in the form of an endless belt.
Claim 22
Dependent Claim
20 words
An apparatus according to claim 15, wherein said film comprises resin material, and said driving member has a surface layer.
Claim 23
Dependent Claim
23 words
An apparatus according to claim 15, wherein the friction coefficient between the film and said driving rotatable member is not less than 1.
Claim 24
Dependent Claim
23 words
An apparatus according to claim 20, wherein the friction coefficient between said film and said driving rotatable member is not more than 10.
Claim 25
Dependent Claim
21 words
An apparatus according to claim 15, wherein the friction coefficient between said film and said heater is not more than 0.2.
Claim 26
Dependent Claim
21 words
An apparatus according to claim 20, wherein the friction coefficient between said film and said heater is not more than 0.2.
Claim 27
Dependent Claim
21 words
An apparatus according to claim 21, wherein the friction coefficient between said film and said heater is not more than 0.2.
Claim 28
Dependent Claim
66 words
An image heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a back-up rotatable member cooperative with said film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from said heater through said film; wherein said nip is longer than a width of said film.
Claim 29
Dependent Claim
66 words
An image heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a back-up rotatable member cooperative with said film to form a nip therebetween, whereby an image on a recording material being passed through the nip is heated by heat from said heater through said film; wherein said nip is longer than a width of said film.
Claim 30
Dependent Claim
17 words
An apparatus according to claim 25, wherein said film has a thickness not more than 100 microns.
Claim 31
Dependent Claim
17 words
An apparatus according to claim 25, wherein said film is in the form of an endless belt.
Claim 32
Dependent Claim
32 words
An apparatus according to claim 25, wherein a friction coefficient between said heater and said back-up rotatable member is smaller than a friction coefficient between said film and said back-up rotatable member.
Claim 33
Dependent Claim
32 words
An apparatus according to claim 28, wherein a friction coefficient between the recording material and said film is smaller than a friction coefficient between the recording material and said back-up rotatable member.
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