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US4630918A
Expired / Lapsed
US
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Image compensating method in a copying machine
Assignee: Sharp Corp
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Filing: 1985-06-11
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Granted: 1986-12-23
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Expires: 2005-06-11
Abstract
Abstract Image intensity adjustment in a copying machine is performed by simultaneously adjusting both a bias voltage to be applied to a developer unit of the copying machine and the intensity of light to be projected at an exposure section onto a photosensitive medium of the copying machine. Adjustment is facilitated by operatively connected variable resistors.
Inventors
- 👤 Yuhi Yui
- 👤 Hiroshi Kinashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/065; G03G15/04; G03G15/043
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
An image compensating method in a copying machine comprising the steps of: applying a bias voltage to a developer unit of the copying machine; controlling the intesity of light to be projected at an exposure section of the copying machine; and simultaneously adjusting both said bias voltage to be applied to the developer unit and the intensity of light to be projected at said exposure section onto a photosensitive medium.
Claim 2
Dependent Claim
70 words
An image compensating method in a copying machine comprising the steps of: applying a bias voltage to a developer unit of the copying machine; controlling the intesity of light to be projected at an exposure section of the copying machine; and simultaneously adjusting both said bias voltage to be applied to the developer unit and the intensity of light to be projected at said exposure section onto a photosensitive medium.
Claim 3
Dependent Claim
72 words
The method of claim 1 wherein said copy machine comprises means for varying the bias voltage of the developer and means for controlling the intensity of the light projection at the exposure section, said means for varying including a first variable resistor, said means for controlling including a second variable resistor, said step of simultaneously adjusting including simultaneously varying said first and second variable resistors by constraining said resistors to move together.
Claim 4
Dependent Claim
93 words
In a copying machine wherein an object to be copied is reproduced as an image on a photosensitive medium, said copying machine having a rotating photoreceptor drum, an exposure section and a developer unit, a method of adjusting image intensity comprising: applying a variable bias voltage to said developer unit; controlling the intensity of light projected by said exposure section; and simultaneously varying said bias voltage applied to said developer unit and the intensity of light projected by said exposure section so as to control image brightness while maintaining image contrast substantially constant.
Claim 5
Dependent Claim
93 words
In a copying machine wherein an object to be copied is reproduced as an image on a photosensitive medium, said copying machine having a rotating photoreceptor drum, an exposure section and a developer unit, a method of adjusting image intensity comprising: applying a variable bias voltage to said developer unit; controlling the intensity of light projected by said exposure section; and simultaneously varying said bias voltage applied to said developer unit and the intensity of light projected by said exposure section so as to control image brightness while maintaining image contrast substantially constant.
Claim 6
Dependent Claim
31 words
The method of claim 3 wherein said step of controlling the intensity of light projected by said exposure section comprises varying the drive voltage supplied to a source of said light.
Claim 7
Dependent Claim
26 words
The method of claim 4 wherein the drive voltage supplied to said light and said bias voltage are both increased to intensify or darken said image.
Claim 8
Dependent Claim
72 words
The method of claim 3 wherein said copy machine comprises means for varying the bias voltage of the developer and means for controlling the intensity of the light projection at the exposure section, said means for varying including a first variable resistor, said means for controlling including a second variable resistor, said step of simultaneously adjusting including simultaneously varying said first and second variable resistors by constraining said resistors to move together.
Claim 9
Independent Claim
87 words
A system for adjusting image intensity in a copying machine and wherein an object to be copied is reproduced as an image on a photosensitive medium, said copying machine including a rotary photoreceptor drum, an exposure section and a developer unit, said system comprising: means for supplying a bias voltage to said developer unit; means for developing the light projected by said exposure section; and means for simultaneously varying said bias voltage developed by said supplying means and the intensity of light projected by said developing means.
Claim 10
Independent Claim
87 words
A system for adjusting image intensity in a copying machine and wherein an object to be copied is reproduced as an image on a photosensitive medium, said copying machine including a rotary photoreceptor drum, an exposure section and a developer unit, said system comprising: means for supplying a bias voltage to said developer unit; means for developing the light projected by said exposure section; and means for simultaneously varying said bias voltage developed by said supplying means and the intensity of light projected by said developing means.
Claim 11
Dependent Claim
62 words
The system of claim 7 wheein said means for developing includes a light source; and said means for simultaneously varying includes: a first variable resistor varying the bias voltage supplied said developer unit, a second variable resistor varying a drive voltage to said light source, means for operatively interconnecting said first and second variable resistors to constrain said resistors to move together.
References Cited (Backward Citations)
US4256401A
Cited
JPS5868766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |