Patent US3328540A successfully refreshed from Google Patents.
Patent US4319285A successfully refreshed from Google Patents.
US4319285A
Expired / Lapsed
US
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Exposure control for selective speed xerographic printing and the like
Assignee: Xerox Corp
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Filing: 1979-03-19
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Granted: 1982-03-09
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Expires: 1999-03-19
Abstract
Abstract A selective speed xerographic processor having a laser for exposing a photoreceptor at any one of a plurality of different printing rates in response to a video signal is characterized by including an adjustable optical attenuator and an adjustable electrical attenuator for coarsely and more precisely, respectively, normalizing the exposure process. The processor may be used to advantage as a printer for a facsimile systems offering a choice of several different document transmission times.
Inventors
- 👤 Timothy M. Minerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:06
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; H04N1/024; H04N1/032; H04N1/036; H04N1/40037
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A method for normalizing the radiant energy imparted to a photoresponsive, exposure time sensitive recording medium while exposing said recording medium, at any selected one of a plurality of different printing rates, to a video modulated light beam emitted by a laser in response to a video input signal, said method comprising the steps of optically attenuating said light beam by an amount which is adjusted as a function of the printing rate selected to at least coarsely normalize the radiant energy imparted to said recording medium, and electrically attenuating said video input signal by an amount which is adjusted as a function of the printing rate selected to hold the radiant energy imparted to said recording medium squarely within a predetermined, normalized range.
Claim 2
Independent Claim
124 words
A method for normalizing the radiant energy imparted to a photoresponsive, exposure time sensitive recording medium while exposing said recording medium, at any selected one of a plurality of different printing rates, to a video modulated light beam emitted by a laser in response to a video input signal, said method comprising the steps of optically attenuating said light beam by an amount which is adjusted as a function of the printing rate selected to at least coarsely normalize the radiant energy imparted to said recording medium, and electrically attenuating said video input signal by an amount which is adjusted as a function of the printing rate selected to hold the radiant energy imparted to said recording medium squarely within a predetermined, normalized range.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said recording medium is a xerographic photoreceptor.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein said video signal represents the information content of a subject copy in a facsimile system offering a choice of several different document transmission times.
References Cited (Backward Citations)
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Cited
US2274530A
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US3316348A
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US3750189A
Cited
US3858004A
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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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |