Patent US5870660A successfully refreshed from Google Patents.
US5870660A
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US
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Heating device
Assignee: Minolta Co Ltd
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Filing: 1997-08-28
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Granted: 1999-02-09
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Expires: 2017-08-28
Abstract
Abstract A heating device for use in an induction heating type fixing system is composed of a sleeve 12 made of an electrical conductive material and an electromagnet 13 with a coil 20 and a core 18. It is constructed so as to fulfill the following formulas (1), (2), and (3). S1+S2≧0.3×S3 (1) 0.2≦S2/(S1+S2)≦0.8 (2) 1 mm≦Dmax≦5 mm (3) wherein S1 stands for the cross sectional area of the core 18, S2 for the cross sectional area of the coil 20, S3 for the cross sectional area of the sleeve 12, and Dmax for the maximum distance formed between the outer periphery of the holder 14 and the inner periphery of the sleeve 12.
Inventors
- 👤 Tetsuro Ito
- 👤 Yuusuke Morigami
- 👤 Takeshi Kato
- 👤 Taizou Oonishi
- 👤 Keigo Tange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:14
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: 22
Claim 1
Independent Claim
67 words
A heating device comprising: a sleeve made of an electrical conductive material; and an electromagnet having a coil and a core; wherein said heading device satisfies the following formulas (1) and (2), S1+S2≧0.3×S3 (1) 0.2≦S2/(S1+S2)≦0.8 (2) wherein S1 is cross sectional area of said core, S2 is cross sectional area of said coil, and S3 is cross sectional area defined by an internal surface of said sleeve.
Claim 2
Dependent Claim
67 words
A heating device comprising: a sleeve made of an electrical conductive material; and an electromagnet having a coil and a core; wherein said heading device satisfies the following formulas (1) and (2), S1+S2≧0.3×S3 (1) 0.2≦S2/(S1+S2)≦0.8 (2) wherein S1 is cross sectional area of said core, S2 is cross sectional area of said coil, and S3 is cross sectional area defined by an internal surface of said sleeve.
Claim 3
Dependent Claim
77 words
A heating device as in claim 1 further comprising: a holder having a sleeve-like shape and made of dielectric material, said holder being provided in said sleeve to contact at a region of said internal surface of said sleeve, and said holder accommodates said electromagnet therein, wherein said heating device further satisfies the following formula (3), 1 mm≦Dmax≦5 mm (3) wherein Dmax is the maximum distance formed between said holder and said internal surface of said sleeve.
Claim 4
Dependent Claim
15 words
A heating device as in claim 1, further comprising a holder which holds said electromagnet.
Claim 5
Dependent Claim
16 words
A heating device as in claim 3, wherein said holder is made of a thermosetting resin.
Claim 6
Dependent Claim
12 words
A heating device as in claim 4, wherein said holder is hardened.
Claim 7
Dependent Claim
36 words
A heating device as in claim 5, wherein said sleeve is heated to a predetermined temperature by an induction heat of said electromagnet, and said holder is hardened in a temperature higher than said predetermined temperature.
Claim 8
Dependent Claim
17 words
A heating device as in claim 3, wherein said holder is made of a fiber reinforced resin.
Claim 9
Dependent Claim
17 words
A heating device as in claim 3, wherein said holder integrally holds said core and said coil.
Claim 10
Dependent Claim
24 words
A heating device as in claim 3, wherein said holder has a region which is in contact with said internal surface of said sleeve.
Claim 11
Dependent Claim
15 words
A heating device as in claim 9, wherein said sleeve relatively rotates around said holder.
Claim 12
Dependent Claim
20 words
A heating device as in claim 10, wherein said region of said holder is made of a low frictional material.
Claim 13
Dependent Claim
15 words
A heating device as in claim 1, wherein said sleeve relatively rotates around said electromagnet.
Claim 14
Dependent Claim
85 words
A heating device comprising: a sleeve made of an electrical conductive material; an electromagnet having a coil and a core; and a holder including a first portion and a second portion, said first portion being for electrically insulating said coil from said core and being located between said coil and core, said second portion being for electrically insulating said electromagnet from said sleeve and being located between said electromagnet and said sleeve, said first portion and said second portion being formed as a single member.
Claim 15
Dependent Claim
85 words
A heating device comprising: a sleeve made of an electrical conductive material; an electromagnet having a coil and a core; and a holder including a first portion and a second portion, said first portion being for electrically insulating said coil from said core and being located between said coil and core, said second portion being for electrically insulating said electromagnet from said sleeve and being located between said electromagnet and said sleeve, said first portion and said second portion being formed as a single member.
Claim 16
Dependent Claim
20 words
A heating device as in claim 13, wherein said holder having a region which is in contact with said sleeve.
Claim 17
Dependent Claim
21 words
A heating device as claimed in claim 14, wherein said holder is in contact with an internal surface of said sleeve.
Claim 18
Dependent Claim
21 words
A heating device as claimed in claim 13, wherein said holder is in contact with an internal surface of said sleeve.
Claim 19
Dependent Claim
81 words
A heating device comprising: a sleeve made of an electrical conductive material; an electromagnet having a coil and a core; and a holder for electrically insulating said coil from said core and said electromagnet from said sleeve, said holder including, a base having an arcuate cross section, and a pair of plates formed on the base, said base and pair of plates being formed as a single member with the core positioned on the base and between the pair of plates.
Claim 20
Dependent Claim
81 words
A heating device comprising: a sleeve made of an electrical conductive material; an electromagnet having a coil and a core; and a holder for electrically insulating said coil from said core and said electromagnet from said sleeve, said holder including, a base having an arcuate cross section, and a pair of plates formed on the base, said base and pair of plates being formed as a single member with the core positioned on the base and between the pair of plates.
Claim 21
Dependent Claim
51 words
A heating device comprising: a sleeve made of an electrical conductive material; an electromagnet having a coil and a core; and an insulating member for electrically insulating said coil from said core and said electromagnet from said sleeve, said insulating member being formed by integrally molding the core and the coil.
Claim 22
Dependent Claim
51 words
A heating device comprising: a sleeve made of an electrical conductive material; an electromagnet having a coil and a core; and an insulating member for electrically insulating said coil from said core and said electromagnet from said sleeve, said insulating member being formed by integrally molding the core and 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) | 2002-02-08 | 2002-08-10 | 2003-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-08 | 2006-08-10 | 2007-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-08 | 2010-08-10 | 2011-02-09 | $7700.00 | Window Closed / Lapsed |