Patent US5128718A successfully refreshed from Google Patents.
US5128718A
Expired / Lapsed
US
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Image forming apparatus responsive to ambient condition detecting means
Assignee: Canon Inc
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Filing: 1990-08-31
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Granted: 1992-07-07
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Expires: 2010-08-31
Abstract
Abstract An image forming apparatus is disclosed which is capable of controlling the quality of the images formed in accordance with detected environmental conditions. This is accomplished in the invention through the use and control of predetermined values which are dependent upon the detected environmental state. A correcting device corrects the predetermined value based on results detected by an image density detecting sensor, whereby the correcting amounts are varied in accordance with the detected environmental state. A constant image density is always obtained regardless of variations in the inner environment of the image formation system.
Inventors
- 👤 Yoshito Mizoguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5041; G03G2215/00; G03G2215/00025; G03G2215/00029; G03G2215/00033; G03G2215/00037
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
83 words
An image forming apparatus, comprising: an image supporting member; means for forming images on said image supporting member; means for detecting image density; means for detecting an environmental state; means for controlling image forming conditions for said image forming means represented by a predetermined value depending on said environmental state; and means for correcting said predetermined value based on the result detected by said image density detecting means; wherein the amount of correction of the above correction means varies with said environmental state.
Claim 2
Dependent Claim
83 words
An image forming apparatus, comprising: an image supporting member; means for forming images on said image supporting member; means for detecting image density; means for detecting an environmental state; means for controlling image forming conditions for said image forming means represented by a predetermined value depending on said environmental state; and means for correcting said predetermined value based on the result detected by said image density detecting means; wherein the amount of correction of the above correction means varies with said environmental state.
Claim 3
Dependent Claim
21 words
An image forming apparatus according to claim 1, wherein said image forming means forms latent images on the image supporting member.
Claim 4
Dependent Claim
43 words
An image forming apparatus according to claim 2, wherein said control means controls the difference in potentials of an image and the other non-image portion of a latent image to be formed to be the predetermined value as one of image forming conditions.
Claim 5
Dependent Claim
30 words
An image forming apparatus according to claim 2, wherein said image forming means applies development bias voltage to the development means to obtain a toner image from said latent image.
Claim 6
Dependent Claim
44 words
An image forming apparatus according to claim 4, wherein said control means controls the difference between the potential at an image of a latent image to be formed and the development bias potential to be the predetermined value as one of image formation conditions.
Claim 7
Dependent Claim
29 words
An image forming apparatus according to claim 5, wherein said control means controls the amount of charge in the charging means which charges the image supporting member with electricity.
Claim 8
Dependent Claim
14 words
An image forming apparatus according to claim 1, wherein said environmental state is humidity.
Claim 9
Dependent Claim
15 words
An image forming apparatus according to claim 7, wherein said humidity is an absolute humidity.
Claim 10
Dependent Claim
23 words
An image forming apparatus according to claim 1, wherein said environmental state detecting means detects the inner environmental state of the said system.
Claim 11
Dependent Claim
19 words
An image forming apparatus according to claim 7, wherein said amounts of correction vary with the change in humidity.
Claim 12
Dependent Claim
27 words
An image forming apparatus according to claim 1, wherein said image density detecting means detects the density of an image formed on the said image supporting member.
Claim 13
Dependent Claim
132 words
An image forming apparatus, comprising: an image supporting member; means for forming images on said image supporting member; first detecting means for detecting image density; second detecting means for detecting an environmental state; and means for controlling image forming conditions for said image forming means, wherein said controlling means determines a base value in response to the environmental state detected by said second detecting means, determines a first value for base value correction in response to the environmental state detected by said second detecting means, determines a second value for base value correction in response to the image density detected by said first detecting means, calculates a correcting value based on the first value and second value, and calculates the image forming conditions based on the base value and the correcting value.
Claim 14
Dependent Claim
132 words
An image forming apparatus, comprising: an image supporting member; means for forming images on said image supporting member; first detecting means for detecting image density; second detecting means for detecting an environmental state; and means for controlling image forming conditions for said image forming means, wherein said controlling means determines a base value in response to the environmental state detected by said second detecting means, determines a first value for base value correction in response to the environmental state detected by said second detecting means, determines a second value for base value correction in response to the image density detected by said first detecting means, calculates a correcting value based on the first value and second value, and calculates the image forming conditions based on the base value and the correcting value.
Claim 15
Dependent Claim
22 words
An image forming apparatus according to claim 12, wherein said image forming means forms electrostatic latent images on said image supporting member.
Claim 16
Dependent Claim
40 words
An image forming apparatus according to claim 13, wherein said controlling means controls difference in potentials of image and non-image portions of a latent image to be formed to be a predetermined value as one of the image forming conditions.
Claim 17
Dependent Claim
29 words
An image forming apparatus according to claim 13, wherein said image forming means applies development bias potential to development means to obtain a toner image from the latent image.
Claim 18
Dependent Claim
45 words
An image forming apparatus according to claim 15, wherein said controlling means controls a difference between the potential at an image of the latent image to be formed and the development bias potential to be a predetermined value as one of the image forming conditions.
Claim 19
Dependent Claim
17 words
An image forming apparatus according to any one of claims 12-16, wherein the environmental state is humidity.
Claim 20
Dependent Claim
120 words
An image forming apparatus, comprising: an image supporting member; means for forming images on said image supporting member; first detecting means for detecting image density; second detecting means for detecting humidity; and means for controlling image forming conditions for said image forming means, wherein said controlling means determines a base value in response to humidity detected by said second detecting means, determines a unit correcting amount corresponding to the humidity detected by said second detecting means, determines correcting coefficients corresponding to the difference between an intended density and an image density detected by said first detecting means, calculates a correcting value by multiplying the unit correcting amount and the correcting coefficient, and adds the correcting value to the base value.
Claim 21
Dependent Claim
120 words
An image forming apparatus, comprising: an image supporting member; means for forming images on said image supporting member; first detecting means for detecting image density; second detecting means for detecting humidity; and means for controlling image forming conditions for said image forming means, wherein said controlling means determines a base value in response to humidity detected by said second detecting means, determines a unit correcting amount corresponding to the humidity detected by said second detecting means, determines correcting coefficients corresponding to the difference between an intended density and an image density detected by said first detecting means, calculates a correcting value by multiplying the unit correcting amount and the correcting coefficient, and adds the correcting value to the base value.
Claim 22
Dependent Claim
22 words
An image forming apparatus according to claim 18, wherein said image forming means forms electrostatic latent images on the image supporting member.
Claim 23
Dependent Claim
42 words
An image forming apparatus according to claim 19, wherein said control means controls the difference in potentials of an image and non-image portions of a latent image to be formed to be a predetermined value as one of the image forming conditions.
Claim 24
Dependent Claim
31 words
An image forming apparatus according to claim 19, wherein said image forming means applies a development bias potential to the development means to obtain a toner image from said latent image.
Claim 25
Dependent Claim
45 words
An image forming apparatus according to claim 21, wherein said controlling means controls the difference between the potential at an image of a latent image to be formed and the development bias potential to be a predetermined value as one of the image forming conditions.
References Cited (Backward Citations)
JPS5473055A
Cited
JPS5710170A
Cited
US4502777A
Cited
US4888618A
Cited
US4989039A
Cited
US4879576A
Cited
US5034772A
Cited
US5049939A
Cited
JPH025179A
Cited
US5057867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |