US5481089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater control device for image forming apparatus
Assignee: Fujifilm Business Innovation Corp
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Filing: 1992-06-23
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Granted: 1996-01-02
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Expires: 2012-06-23
Abstract
Abstract Disclosed is a heater control device which controls a heater used in an image forming apparatus such as a laser printer, a copying machine, or a facsimile machine. The heater control device includes a switch for connecting and disconnecting an application of an alternating current voltage to the heater used in the image forming apparatus, and a switch control unit for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling the switch in accordance with a value of the alternating current voltage applied to the heater. The heater control device can be used regardless of the differing voltage levels of available commercial power provided in various geographic regions of the world respect to voltage.
Inventors
- 👤 Hideki Furuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:04
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1913; G05D23/20; Y; Y10; Y10S; Y10S323/00; Y10S323/901
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A heater control device for an image forming apparatus comprising: a switch for connecting and disconnecting an application of an alternating current voltage to a heater used in an image forming apparatus, the alternating current voltage being received from a commercial power source; a temperature detecting device provided in the proximity of the heater for detecting the ambient temperature in the proximity of said heater; and switch control means for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling said switch in accordance with a value of the alternating current voltage received from the commercial power source and a temperature detected by said temperature detecting device.
Claim 2
Dependent Claim
120 words
A heater control device for an image forming apparatus comprising: a switch for connecting and disconnecting an application of an alternating current voltage to a heater used in an image forming apparatus, the alternating current voltage being received from a commercial power source; a temperature detecting device provided in the proximity of the heater for detecting the ambient temperature in the proximity of said heater; and switch control means for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling said switch in accordance with a value of the alternating current voltage received from the commercial power source and a temperature detected by said temperature detecting device.
Claim 3
Dependent Claim
90 words
The heater control device as defined in claim 1, wherein said switch control device sets a period of time available for the application of the alternating current voltage in accordance with the temperature detected by said temperature detected by said temperature detecting device, and varies the period of time for the application of the alternating current voltage to the heater in the period of time available for the application of the alternating current voltage in accordance with the value of the alternating current voltage received from the commercial power source.
Claim 4
Dependent Claim
202 words
A heater control device for an image forming apparatus comprising: a switch for connecting and disconnecting an application of an alternating current voltage to a heater used in an image forming apparatus, the alternating current voltage being received from a commercial power source; a first temperature detecting device for detecting a temperature on a surface of the heater; a second temperature detecting device for detecting the a temperature in a circumference of the heater; and switch control means for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling said switch in accordance with a value of the alternating current voltage received from the commercial power source until the temperature detected by said first temperature detecting device attains a predetermined temperature, and for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling said switch in accordance with a value of the alternating current voltage received from the commercial power source and the temperature detected by said second temperature detecting device after the temperature detected by said first temperature detecting device has attained the predetermined temperature.
Claim 5
Dependent Claim
202 words
A heater control device for an image forming apparatus comprising: a switch for connecting and disconnecting an application of an alternating current voltage to a heater used in an image forming apparatus, the alternating current voltage being received from a commercial power source; a first temperature detecting device for detecting a temperature on a surface of the heater; a second temperature detecting device for detecting the a temperature in a circumference of the heater; and switch control means for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling said switch in accordance with a value of the alternating current voltage received from the commercial power source until the temperature detected by said first temperature detecting device attains a predetermined temperature, and for varying a period of time for the application of the alternating current voltage to the heater per unit period of time by controlling said switch in accordance with a value of the alternating current voltage received from the commercial power source and the temperature detected by said second temperature detecting device after the temperature detected by said first temperature detecting device has attained the predetermined temperature.
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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) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |