US5122835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensating densitometer readings for drifts and dusting
Assignee: Eastman Kodak Co
•
Filing: 1991-05-06
•
Granted: 1992-06-16
•
Expires: 2011-05-06
Abstract
Abstract Densitometer readings are corrected by obtaining density readings on an untoned area of the interframe region of an image receiver during cycle-up, storing the readings and subtracting the stored readings from subsequent test readings of the same area of the image receiver. Differences between the cycle-up readings and test readings are used to adjust density readings of toned reference patches obtained with the test readings. The procedure can be used during production modes of the machine, with all readings being taken in the interframe regions, or the procedure can be a part of an automatic set-up operation with toned reference patch readings being taken in the image frame areas of the image receiver.
Inventors
- 👤 Allen J. Rushing
- 👤 Sally L. Stearns
- 👤 David D. Almeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5041; G03G2215/00; G03G2215/00025; G03G2215/00029; G03G2215/00033; G03G2215/00037; G03G2215/00042
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
158 words
Apparatus for adjusting at least one process control parameter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said apparatus comprising: sensor means for (1) sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area and (2) generating, during the run mode, a signal having a value characteristic of the normalized detected optical density of the toned reference patch; means for correcting the value of the generated signal in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode; and means for comparing teh corrected value of the generated signal with an aim value to control the process control parameter.
Claim 2
Dependent Claim
158 words
Apparatus for adjusting at least one process control parameter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said apparatus comprising: sensor means for (1) sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area and (2) generating, during the run mode, a signal having a value characteristic of the normalized detected optical density of the toned reference patch; means for correcting the value of the generated signal in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode; and means for comparing teh corrected value of the generated signal with an aim value to control the process control parameter.
Claim 3
Dependent Claim
29 words
Apparatus as defined in claim 1 wherein said sensor means is adapted to sense the optical density of an untoned area of the image receiver in an interframe region.
Claim 4
Dependent Claim
27 words
Apparatus as defined in claim 1 wherein said sensor means is adapted to sense the optical density of a toned reference patch in an image frame area.
Claim 5
Dependent Claim
30 words
Apparatus as defined in claim 1 further comprising means for storing said sensed optical density of the untoned area obtained during the cycle-up mode for use during the run mode.
Claim 6
Dependent Claim
135 words
Apparatus for adjusting at least one process control parameter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said apparatus comprising: sensor means for (1) sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area and (2) generating, during the run mode, a signal having a value characteristic of the detected optical density of the toned reference patch; and means for adjusting the process control parameter in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode.
Claim 7
Dependent Claim
135 words
Apparatus for adjusting at least one process control parameter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said apparatus comprising: sensor means for (1) sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area and (2) generating, during the run mode, a signal having a value characteristic of the detected optical density of the toned reference patch; and means for adjusting the process control parameter in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode.
Claim 8
Dependent Claim
29 words
Apparatus as defined in claim 5 wherein said sensor means is adapted to sense the optical density of an untoned area of the image receiver in an interframe region.
Claim 9
Dependent Claim
27 words
Apparatus as defined in claim 5 wherein said sensor means is adapted to sense the optical density of a toned reference patch in an image frame area.
Claim 10
Dependent Claim
30 words
Apparatus as defined in claim 5 further comprising means for storing said sensed optical density of the untoned area obtained during the cycle-up mode for use during the run mode.
Claim 11
Dependent Claim
147 words
A process adjusting at least one process control parmeter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said process comprising: sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area generating, during the run mode, a signal having a value characteristic of the detected optical density of the toned reference patch, correcting the value of the generated signal in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode; and comparing the corrected value of the generated signal with an aim value to control the process control parameter.
Claim 12
Dependent Claim
147 words
A process adjusting at least one process control parmeter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said process comprising: sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area generating, during the run mode, a signal having a value characteristic of the detected optical density of the toned reference patch, correcting the value of the generated signal in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode; and comparing the corrected value of the generated signal with an aim value to control the process control parameter.
Claim 13
Dependent Claim
29 words
A process as defined in claim 1 further comprising storing said sensed optical density of the untoned area obtained during the cycle-up mode for use during the run mode.
Claim 14
Dependent Claim
128 words
A process for adjusting at least one process control parameter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said process comprising: sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area; generating, during the run mode, a signal having a value characteristic of the detected optical density of the toned reference patch, and adjusting the process control parameter in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode.
Claim 15
Dependent Claim
128 words
A process for adjusting at least one process control parameter of an electrostatographic machine, having a cycle-up mode and a run mode, in accordance with detected density values from a toned reference patch on an image receiver having image frame areas, said process comprising: sensing the optical density of an untoned area of the image receiver in a region outside of an image frame area; generating, during the run mode, a signal having a value characteristic of the detected optical density of the toned reference patch, and adjusting the process control parameter in accordance with the difference between the sensed optical density of the untoned area of the image receiver during the cycle-up mode and the sensed optical density of the same untoned region during the run mode.
References Cited (Backward Citations)
US4183657A
Cited
US4313671A
Cited
US4326795A
Cited
US4341461A
Cited
US4377338A
Cited
US4647184A
Cited
US4693592A
Cited
US4894685A
Cited
US4860059A
Cited
US4878082A
Cited
US5051781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |