Patent US5534987A successfully refreshed from Google Patents.
US5534987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing apparatus with variable fixing temperature
Assignee: Canon Inc
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Filing: 1995-07-28
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Granted: 1996-07-09
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Expires: 2015-07-28
Abstract
Abstract A fixing apparatus includes a heating member; a temperature detecting member for detecting the temperature of the heating member; a power supply controller for controlling the power supply to the heating member so that the temperature detected by the temperature detecting element during a fixing operation is maintained substantially constant at a predetermined fixing temperature; and a temperature selecting device for selecting a fixing temperature in response to both the temperature of the heating member before beginning of the fixing temperature control and a rate of the temperature change of the heating member upon supplying a predetermined amount of power to the heating member or upon turning it off.
Inventors
- 👤 Yasumasa Ohtsuka
- 👤 Shunji Nakamura
- 👤 Takashi Soya
- 👤 Kouichi Okuda
- 👤 Yohji Tomoyuki
- 👤 Akira Hayakawa
- 👤 Manabu Takano
- 👤 Daizo Fukuzawa
- 👤 Hidenobu Suzuki
- 👤 Atsuyoshi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/205; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2022; G03G2215/2035; G03G2215/2038
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A fixing apparatus comprising: a heating member; a temperature detecting member for detecting the temperature of said heating member; electric power supply controlling means for controlling an electric power supply to said heating member so that the temperature detected by said temperature detecting member during a fixing operation is maintained substantially constant at a predetermined fixing temperature; and temperature determining means for determining the fixing temperature in response to both the temperature of said heating member before beginning of the electric power supply control during the fixing operation and a rate of the temperature change of said heating member upon supplying a predetermined amount of electric power to said heating member or upon turning it off.
Claim 2
Dependent Claim
116 words
A fixing apparatus comprising: a heating member; a temperature detecting member for detecting the temperature of said heating member; electric power supply controlling means for controlling an electric power supply to said heating member so that the temperature detected by said temperature detecting member during a fixing operation is maintained substantially constant at a predetermined fixing temperature; and temperature determining means for determining the fixing temperature in response to both the temperature of said heating member before beginning of the electric power supply control during the fixing operation and a rate of the temperature change of said heating member upon supplying a predetermined amount of electric power to said heating member or upon turning it off.
Claim 3
Dependent Claim
59 words
A fixing apparatus according to claim 1, wherein said temperature determining means compares the fixing temperature selected in response to the temperature of said heating member obtained before the beginning of the fixing temperature control with the fixing temperature selected in response to the rate of the temperature change, and selects the higher one as an actual fixing temperature.
Claim 4
Dependent Claim
39 words
A fixing apparatus according to claim 1, wherein said temperature determining means turns off the electric power supply to said heating member after the completion of the fixing operation, and measures the rate of temperature change at this time.
Claim 5
Dependent Claim
40 words
A fixing apparatus according to claim 1, wherein said apparatus further comprises a film moving in contact with said heating member and a pressing member for forming a nip in cooperation with said heating member, with said film being interposed.
Claim 6
Dependent Claim
35 words
A fixing apparatus according to claim 1, wherein said electric power supply controlling means turns off the power supply to said heating member during a standby period, regardless of the temperature of said heating member.
Claim 7
Dependent Claim
96 words
A fixing apparatus comprising: a heating member; a temperature detecting member for detecting the temperature of said heating member; electric power supply controlling means for controlling an electric power supply to said heating member so that the temperature detected by said temperature detecting member during a fixing operation is maintained at a predetermined fixing temperature; and temperature determining means for determining the fixing temperature in response to both the temperature of said heating member before beginning of the electric power supply control during the fixing operation and the fixing temperature during an immediately previous fixing operation.
Claim 8
Dependent Claim
96 words
A fixing apparatus comprising: a heating member; a temperature detecting member for detecting the temperature of said heating member; electric power supply controlling means for controlling an electric power supply to said heating member so that the temperature detected by said temperature detecting member during a fixing operation is maintained at a predetermined fixing temperature; and temperature determining means for determining the fixing temperature in response to both the temperature of said heating member before beginning of the electric power supply control during the fixing operation and the fixing temperature during an immediately previous fixing operation.
Claim 9
Dependent Claim
51 words
An apparatus according to claim 6, wherein said temperature determining means compares the fixing temperature selected in response to the temperature of said heating member obtained before the beginning of the fixing operation with the fixing temperature during previous fixing operation, and selects the higher one as an actual fixing temperature.
Claim 10
Dependent Claim
39 words
An apparatus according to claim 6, wherein said apparatus further comprises a film moving in contact with said heating member and a pressing member for forming a nip in cooperation with said heating member, with said film being interposed.
Claim 11
Dependent Claim
34 words
An apparatus according to claim 6, wherein said electric power supply controlling means turns off the power supply to said heating member during a standby period, regardless of the temperature of said heating member.
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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) | 1999-07-09 | 2000-01-08 | 2000-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-09 | 2004-01-08 | 2004-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-09 | 2008-01-08 | 2008-07-09 | $7700.00 | Window Closed / Lapsed |