US5608747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal cross-talk compensating current driver for laser diode array
Assignee: Eastman Kodak Co
•
Filing: 1995-04-13
•
Granted: 1997-03-04
•
Expires: 2015-04-13
Abstract
Abstract A method and apparatus for operating a laser diode array in a laser thermal printer, wherein the laser diodes are formed on a common substrate, includes: generating digital image data signals for the individual diodes in the array; generating correction signals for each diode in the array, the correction signals being generated by weighting selected digital image data signals; summing the weighted correction signals with the digital image data signals for each diode in the array to produce control signals; employing the control signals to produce a driving current for each diode in the array; applying the driving currents to the diodes in the array.
Inventors
- 👤 Seung H. Baek
- 👤 Thomas A. Mackin
- 👤 Nea Y. Woo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:20
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/40031
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A method of operating a laser diode array in a laser printer, wherein the laser diodes are formed on a common substrate, comprising the steps of; a. generating digital image data signals for the individual diodes in the array; b. generating correction signals for each diode in the array, the correction signals being generated by weighting selected digital image data signals; c. summing the correction signals with the digital image data signals for each diode in the array to produce control signals; d. employing the control signals to produce a driving current for each diode in the array; and e. applying the driving currents to the diodes in the array.
Claim 2
Independent Claim
110 words
A method of operating a laser diode array in a laser printer, wherein the laser diodes are formed on a common substrate, comprising the steps of; a. generating digital image data signals for the individual diodes in the array; b. generating correction signals for each diode in the array, the correction signals being generated by weighting selected digital image data signals; c. summing the correction signals with the digital image data signals for each diode in the array to produce control signals; d. employing the control signals to produce a driving current for each diode in the array; and e. applying the driving currents to the diodes in the array.
Claim 3
Dependent Claim
42 words
The method of operating a laser diode array claimed in claim 1, wherein the selected digital image data signals are the digital image data signals for the nearest neighboring diodes in the array and the next nearest neighboring diodes in the array.
Claim 4
Dependent Claim
25 words
The method of operating a laser diode array claimed in claim 2, wherein the selected digital image data signals include previous digital image data signals.
Claim 5
Dependent Claim
27 words
The method of operating a laser diode array claimed in claim 3, wherein the previous digital image data signals are for the diode itself and neighboring diodes.
Claim 6
Dependent Claim
42 words
The method of operating a laser diode array claimed in claim 2, wherein the weighting for the digital image data signals for the nearest neighboring diodes is greater than the weighting for digital image data signals for the next nearest neighboring diodes.
Claim 7
Dependent Claim
36 words
The method of operating a laser diode array claimed in claim 1, wherein the digital image data signals are 1 bit halftone signals and the control signals are multilevel signals generated from 12 bit digital signals.
Claim 8
Dependent Claim
112 words
Apparatus for controlling a laser diode array of the type having the laser diodes formed on a common substrate, in a laser printer, comprising: a. a raster image processor for producing digital image data signals; b. a control signal generator for receiving the digital image data signals and producing a control signal for each laser diode in the array, the control signal generator including means for adjusting the control signals by adding correction signals to the digital image data signals, the correction signals being generated by weighting selected digital image data signals; and c. a current driver responsive to the control signals to produce drive currents for the diodes in the array.
Claim 9
Dependent Claim
112 words
Apparatus for controlling a laser diode array of the type having the laser diodes formed on a common substrate, in a laser printer, comprising: a. a raster image processor for producing digital image data signals; b. a control signal generator for receiving the digital image data signals and producing a control signal for each laser diode in the array, the control signal generator including means for adjusting the control signals by adding correction signals to the digital image data signals, the correction signals being generated by weighting selected digital image data signals; and c. a current driver responsive to the control signals to produce drive currents for the diodes in the array.
Claim 10
Dependent Claim
42 words
The apparatus for controlling a laser diode array claimed in claim 7, wherein the selected digital image data signals are the digital image data signals for the nearest neighboring diodes in the array and the next nearest neighboring diodes in the array.
Claim 11
Dependent Claim
25 words
The apparatus for controlling a laser diode array claimed in claim 8, wherein the selected digital image data signals include previous digital image data signals.
Claim 12
Dependent Claim
27 words
The apparatus for controlling a laser diode array claimed in claim 9, wherein the previous digital image data signals are for the diode itself and neighboring diodes.
Claim 13
Dependent Claim
38 words
The apparatus for controlling a laser diode array claimed in claim 8, wherein the weighting for the control signals for the nearest neighboring diodes is greater than the weighting for control signals for the next nearest neighboring diodes.
Claim 14
Dependent Claim
36 words
The apparatus for controlling a laser diode array claimed in claim 7, wherein the digital image data signals are 1 bit halftone signals and the control signals are multilevel signals generated from 12 bit digital signals.
References Cited (Backward Citations)
US4804975A
Cited
US5479272A
Cited
US5151915A
Cited
US5479189A
Cited
US5109460A
Cited
US5479538A
Cited
US5485284A
Cited
US5331439A
Cited
US5481380A
Cited
US5375002A
Cited
US5377041A
Cited
US5467201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-03 | 2000-09-02 | 2001-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-03 | 2004-09-02 | 2005-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-03 | 2008-09-02 | 2009-03-04 | $7700.00 | Window Closed / Lapsed |