US4001541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash fusing system with energy control
Assignee: Xerox Corp
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Filing: 1975-06-11
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Granted: 1977-01-04
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Expires: 1995-06-11
Abstract
Abstract A flash fusing system for fusing toner images onto support material in which the support material is transported in a path past one or more flash fusing lamps. The flash fusing lamps are coupled to a circuit including a power supply voltage which is adjusted by an input from a sensing circuit including, a photodiode which measures the density of the unfused toner images on support material and converts the information into electrical signals. The electrical signals are supplied to an integrator which in turn is coupled to the power supply voltage of the circuit for energizing the flash lamps.
Inventors
- 👤 Gilbert J. Hatch
- 👤 Richard C. Johnson
- 👤 Ihor Kulbida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:27
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007; G03G15/201
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
An improved flash fusing system for fusing toner images onto support material comprising: flash lamp means, means for advancing support material bearing loose toner images along a path past said flash lamp means; a power supply means coupled to said flash lamp means including a transformer means having a secondary winding coupled to a chargeable capacitor means for energizing said flash lamp means and means for sensing the energy on said capacitor means; and sensing means for sensing the density of toner images on the copy sheets advanced and producing signals directly proportional to the total reflectivity of the toner images and transmitting said signals to the power supply means for controlling the charge on said capacitor means to a predetermined level.
Claim 2
Dependent Claim
122 words
An improved flash fusing system for fusing toner images onto support material comprising: flash lamp means, means for advancing support material bearing loose toner images along a path past said flash lamp means; a power supply means coupled to said flash lamp means including a transformer means having a secondary winding coupled to a chargeable capacitor means for energizing said flash lamp means and means for sensing the energy on said capacitor means; and sensing means for sensing the density of toner images on the copy sheets advanced and producing signals directly proportional to the total reflectivity of the toner images and transmitting said signals to the power supply means for controlling the charge on said capacitor means to a predetermined level.
Claim 3
Dependent Claim
17 words
A system according to claim 1 wherein said flash lamp means includes a plurality of flash lamps.
Claim 4
Dependent Claim
23 words
A system according to claim 1 including means for comparing the charge of said capacitor means with signals produced by said sensing means.
Claim 5
Dependent Claim
25 words
A system according to claim 1 wherein said power supply means includes switching means for controlling current through a primary winding of said transformer means.
Claim 6
Dependent Claim
30 words
A system according to claim 4 wherein the current through said primary winding and switching means is sensed and transmitted to a switch driver means connected to said switching means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |