Patent US5452001A successfully refreshed from Google Patents.
US5452001A
Expired / Lapsed
US
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Serial pixel readout scheme for butted sensor chips in multi-chip input scanner
Assignee: Xerox Corp
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Filing: 1993-10-22
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Granted: 1995-09-19
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Expires: 2013-10-22
Abstract
Abstract A raster input scanner comprises a linear array of photosensors arranged on a plurality of butted chips. The analog video signal from the first photosensor on each chip is read out for an extended period relative to the readout of the other photosensors on the chip, to provide extra settling time for the signal.
Inventors
- 👤 Paul A. Hosier
- 👤 Scott L. Tewinkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:11
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N25/00; H04N25/60; H04N25/63; H04N25/633; H04N25/70; H04N25/701; H04N25/7013
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
In a raster input scanner having a plurality of sets of active photosensors, a method of reading out signals from the photosensors to a single channel, comprising the steps of: for each of a plurality of active photosensors in each set, transferring a signal from the active photosensor to the channel for a predetermined regular readout period; and for a first active photosensor to be read out in each set, transferring a signal from the first active photosensor to the channel for an extended readout period which is substantially longer than the regular readout period; and where the extended readout period is set to a period of sufficient length so as to allow for the setting of charges in the first active photosensor, and further, where the relative length of the extended readout period with respect to the regular readout period is independent of illumination level.
Claim 2
Dependent Claim
146 words
In a raster input scanner having a plurality of sets of active photosensors, a method of reading out signals from the photosensors to a single channel, comprising the steps of: for each of a plurality of active photosensors in each set, transferring a signal from the active photosensor to the channel for a predetermined regular readout period; and for a first active photosensor to be read out in each set, transferring a signal from the first active photosensor to the channel for an extended readout period which is substantially longer than the regular readout period; and where the extended readout period is set to a period of sufficient length so as to allow for the setting of charges in the first active photosensor, and further, where the relative length of the extended readout period with respect to the regular readout period is independent of illumination level.
Claim 3
Dependent Claim
36 words
The method of claim 1, further comprising the step of transferring a signal from the first active photosensor in each set first in a predetermined order of reading out signals from the photosensors to the channel.
Claim 4
Dependent Claim
20 words
The method of claim 1, wherein the extended readout period is approximately twice the duration of the regular readout period.
Claim 5
Dependent Claim
31 words
The method of claim 1, wherein the active photosensors in a set are arranged in a linear array, and the first active photosensor is disposed at one end of the array.
Claim 6
Dependent Claim
32 words
The method of claim 1, further comprising the step of reading out signals from the active photosensors associated with each set in the order of the arrangement of photosensors along the array.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein the active photosensors for each set are disposed on a single chip.
Claim 8
Dependent Claim
37 words
The method of claim 1, further comprising the step of transferring a signal from a dark pixel photosensor in each set to the channel prior to transferring a signal from the first active photosensor in the set.
Claim 9
Dependent Claim
129 words
A raster input scanner, comprising: a plurality of sets of active photosensors; serial readout means for sequentially reading out signals from the photosensors in each set in a predetermined order; and settling means for providing an extended readout period for transferring a signal from a first active photosensor to be read out in each set, the extended readout period being substantially longer than a regular readout period for transferring signals from most other active photosensors in the set; and where the extended readout period is set to a period of sufficient length so as to allow for the settling of charges in the first active photosensor, and further, where the relative length of the extended readout period with respect to the regular readout period is independent of illumination level.
Claim 10
Dependent Claim
129 words
A raster input scanner, comprising: a plurality of sets of active photosensors; serial readout means for sequentially reading out signals from the photosensors in each set in a predetermined order; and settling means for providing an extended readout period for transferring a signal from a first active photosensor to be read out in each set, the extended readout period being substantially longer than a regular readout period for transferring signals from most other active photosensors in the set; and where the extended readout period is set to a period of sufficient length so as to allow for the settling of charges in the first active photosensor, and further, where the relative length of the extended readout period with respect to the regular readout period is independent of illumination level.
Claim 11
Dependent Claim
20 words
The scanner of claim 8, wherein the extended readout period is approximately twice the duration of the regular readout period.
Claim 12
Dependent Claim
31 words
The scanner of claim 8, wherein the active photosensors in each set are arranged in a linear array, and the first active photosensor is disposed at one end of the array.
Claim 13
Dependent Claim
17 words
The scanner of claim 8, wherein the photosensors for each set are disposed on a single chip.
Claim 14
Dependent Claim
25 words
The scanner of claim 8, comprising a plurality of chips, each chip having a plurality of active photosensors constituting a set of active photosensors thereon.
Claim 15
Dependent Claim
42 words
The scanner of claim 8, wherein each set further comprises at least one dark pixel photosensor, and the serial readout means transfers a signal from the dark pixel photosensor prior to transferring a signal from the first active photosensor in the set.
Claim 16
Dependent Claim
66 words
The scanner of claim 8, wherein: the serial readout means includes a shift register input line having a plurality of shift register select switches operatively disposed thereon, each shift register select switch being operatively connected to one active photosensor, and the settling means includes an extra shift register select switch on the shift register input line operatively connected to the first active photosensor in the set.
References Cited (Backward Citations)
US4228465A
Cited
US4556908A
Cited
US4553169A
Cited
US4581650A
Cited
US4734772A
Cited
US4706123A
Cited
US5027226A
Cited
US4999484A
Cited
US5280304A
Cited
US5198654A
Cited
US5184006A
Cited
US5109940A
Cited
US5268765A
Cited
US5216493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |