US4872035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus
Assignee: Canon Inc
•
Filing: 1988-02-02
•
Granted: 1989-10-03
•
Expires: 2008-02-02
Abstract
Abstract There is disclosed an image forming apparatus capable of controlling the image forming conditions in different modes according to the magnification of the image to be formed, or according to the process speed.
Inventors
- 👤 Hiroyuki Miyake
- 👤 Seiji Sagara
- 👤 Takaji Yonemori
- 👤 Tsuyoshi Watanabe
- 👤 Masayoshi Takahashi
- 👤 Koji Suzuki
- 👤 Yutaka Komiya
- 👤 Masahiro Tomosada
- 👤 Hideki Adachi
- 👤 Masayuki Hirose
- 👤 Masanori Miyata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:19
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
125 words
An image forming apparatus comprising: image forming means for forming an image on a recording member with any one of a plurality of different image magnifications; and controls means for controlling the image forming conditions of said image forming means, wherein said control means control the image forming conditions in any one of a plurality of different control modes of which each has different parameter in accordance with the image magnification such that when the image magnification is anywhere within a first range the image forming conditions are controlled in a first control mode having a first parameter, and when the desired image magnification is anywhere within a second range the image forming conditions are controlled in a second control means having a second parameter.
Claim 2
Dependent Claim
125 words
An image forming apparatus comprising: image forming means for forming an image on a recording member with any one of a plurality of different image magnifications; and controls means for controlling the image forming conditions of said image forming means, wherein said control means control the image forming conditions in any one of a plurality of different control modes of which each has different parameter in accordance with the image magnification such that when the image magnification is anywhere within a first range the image forming conditions are controlled in a first control mode having a first parameter, and when the desired image magnification is anywhere within a second range the image forming conditions are controlled in a second control means having a second parameter.
Claim 3
Dependent Claim
36 words
An image forming apparatus according to claim 1, wherein said parameters are control data for controlling said image forming condition to be a predetermined condition and said control data are common in said respective control modes.
Claim 4
Dependent Claim
29 words
An image forming apparatus according to claim 2, wherein said control data are initial values for driving said image forming means for the control of the image forming conditions.
Claim 5
Dependent Claim
27 words
An image forming apparatus according to claim 2, wherein said control data are refreshed upon each selection of an image magnification within the first or second, respectively.
Claim 6
Dependent Claim
20 words
An image forming apparatus according to claim 4, wherein said control means comprises a memory for storing said control data.
Claim 7
Dependent Claim
22 words
An image forming apparatus according to claim 2 or 3, wherein said control means comprises a memory for storing said control data.
Claim 8
Dependent Claim
25 words
An image forming apparatus according to claim 1, wherein target values for control of the image forming conditions are constant regardless of the image magnification.
Claim 9
Dependent Claim
48 words
An image forming apparatus according to claim 1, wherein said image forming means comprises a charger for charging the recording member and an exposure lamp for illuminating the recording member and said control means is adapted to control at least one of said charger and said exposure lamp.
Claim 10
Dependent Claim
51 words
An image forming apparatus according to claim 8, wherein said control means comprises detecting means comprises detecting means for detecting the surface state of the recording member and is adapted to control at least one of said charger and said exposure lamp in response to the output of said detecting means.
Claim 11
Dependent Claim
35 words
An image forming apparatus according to claim 9, wherein said control means is adapted to detect said surface state a plurality of times and to control said charger or said exposure lamp, respectively, plural times.
Claim 12
Dependent Claim
41 words
An image forming apparatus according to claim 10, wherein said detecting means is adapted to detect the surface state of a dark area formed on said recording member and to control said charger in response to the output of said detection.
Claim 13
Dependent Claim
42 words
An image forming apparatus according to claim 10, wherein said detecting means is adapted to detect the surface state of a light area formed on said recording member and to control said exposure lamp in response to the output of said detection.
Claim 14
Dependent Claim
15 words
An image forming apparatus according to claim 10, wherein said surface state is surface potential.
Claim 15
Dependent Claim
41 words
An image forming apparatus according to claim 9, wherein said detecting means is adapted to detect the surface state of a dark area formed on the recording member and to control said charger in response to the output of said detection.
Claim 16
Dependent Claim
15 words
An image forming apparatus according to claim 14, wherein said surface state is surface potential.
Claim 17
Dependent Claim
41 words
An image forming apparatus according to claim 9, wherein said detecting means is adapted to detect the surface state of a light area formed on the recording member and to control said exposure lamp in response to the output of detection.
Claim 18
Dependent Claim
15 words
An image forming apparatus according to claim 16, wherein said surface state is surface potential.
Claim 19
Dependent Claim
15 words
An image forming apparatus according to claim 9, wherein said surface state is surface potential.
Claim 20
Dependent Claim
30 words
An image forming apparatus according to claim 1, wherein said control means is adapted to effect different control modes in response to the process speed of said image forming means.
Claim 21
Dependent Claim
22 words
An image forming apparatus according to claim 19, wherein said process speed is varied according to the feeding means of recording material.
Claim 22
Dependent Claim
21 words
An image forming apparatus according to claim 19, wherein said process speed is varied according to the thickness of recording material.
Claim 23
Dependent Claim
148 words
An image forming apparatus comprising: image forming means for forming an image on a recording material at any one of a plurality of different process speeds; selecting means for selecting one from among said different process speeds; control means for controlling the image forming conditions of said image forming means in accordance with the process speed; and memory means for storing a plurality of control data obtained through the control of said image forming conditions by said control means for respective ones of said process speeds, wherein said control means selects determined control data from said plurality of control data stored in said memory means in accordance with the process speed selected by said selecting means, controls said image forming control data newly obtained after completion of said control of the image forming conditions to be stored in said memory means for subsequent selection by said control means.
Claim 24
Dependent Claim
148 words
An image forming apparatus comprising: image forming means for forming an image on a recording material at any one of a plurality of different process speeds; selecting means for selecting one from among said different process speeds; control means for controlling the image forming conditions of said image forming means in accordance with the process speed; and memory means for storing a plurality of control data obtained through the control of said image forming conditions by said control means for respective ones of said process speeds, wherein said control means selects determined control data from said plurality of control data stored in said memory means in accordance with the process speed selected by said selecting means, controls said image forming control data newly obtained after completion of said control of the image forming conditions to be stored in said memory means for subsequent selection by said control means.
Claim 25
Dependent Claim
30 words
An image forming apparatus according to claim 22, wherein said control data are initial values, associated with said control of the image forming conditions, for driving said image forming means.
Claim 26
Dependent Claim
22 words
An image forming apparatus according to claim 22 or 23, wherein said control means comprises a memory for storing said control data.
Claim 27
Dependent Claim
26 words
An image forming apparatus according to claim 22, wherein target values of said control of the image forming conditions are constant regardless of said process speed.
Claim 28
Dependent Claim
22 words
An image forming apparatus according to claim 22, wherein said process speed is varied according to a feeding means of recording material.
Claim 29
Dependent Claim
22 words
An image forming apparatus according to claim 26, wherein a low process speed is selected when the recording material is manually fed.
Claim 30
Dependent Claim
22 words
An image forming apparatus according to claim 22, wherein said process speed is varied according to the thickness of the recording material.
Claim 31
Dependent Claim
23 words
An image forming apparatus according to claim 28, wherein a low process speed is selected when the recording material has a large thickness.
Claim 32
Dependent Claim
159 words
An image forming apparatus comprising: image forming means for forming on a recording member with any one of a plurality with any one of a plurality of different image magnifications; selecting means for selecting one among said different image magnifications; control means for controlling the image forming condition of said image forming means in accordance with the image magnification; and memory means for storing a plurality of control data obtained through the control of said image forming condition by said control means for respective ones of said image magnifications, wherein said control means selects determined control data from said plurality of control data stored in said memory means in accordance with the image magnification selected by said means, controls said image forming condition based on the selection control data, and causes control data newly obtained after completion of said control of the image forming conditions to be stored in said memory means for subsequent selection by said control means.
Claim 33
Dependent Claim
159 words
An image forming apparatus comprising: image forming means for forming on a recording member with any one of a plurality with any one of a plurality of different image magnifications; selecting means for selecting one among said different image magnifications; control means for controlling the image forming condition of said image forming means in accordance with the image magnification; and memory means for storing a plurality of control data obtained through the control of said image forming condition by said control means for respective ones of said image magnifications, wherein said control means selects determined control data from said plurality of control data stored in said memory means in accordance with the image magnification selected by said means, controls said image forming condition based on the selection control data, and causes control data newly obtained after completion of said control of the image forming conditions to be stored in said memory means for subsequent selection by said control means.
Claim 34
Dependent Claim
162 words
An image forming apparatus comprising: image forming means for forming an image on a recording member with any one of a plurality of different image magnifications; control means for controlling the image forming conditions of said image forming means in accordance with the image magnification; and memory means for storing a plurality of control data obtained from control of said image forming conditions by said control means, wherein said control means selects determined control data from said plurality of control data stored in said memory means in accordance with the image magnification, and controls said image forming conditions based on the selected control data and wherein said control means is adapted to the control the image forming conditions of said image forming means such that when the desired image magnification is anywhere within one of several predetermined ranges and the desired process speed is a predetermined value, said image forming means is controlled in a control mode common throughout that predetermined range.
Claim 35
Dependent Claim
162 words
An image forming apparatus comprising: image forming means for forming an image on a recording member with any one of a plurality of different image magnifications; control means for controlling the image forming conditions of said image forming means in accordance with the image magnification; and memory means for storing a plurality of control data obtained from control of said image forming conditions by said control means, wherein said control means selects determined control data from said plurality of control data stored in said memory means in accordance with the image magnification, and controls said image forming conditions based on the selected control data and wherein said control means is adapted to the control the image forming conditions of said image forming means such that when the desired image magnification is anywhere within one of several predetermined ranges and the desired process speed is a predetermined value, said image forming means is controlled in a control mode common throughout that predetermined range.
Claim 36
Dependent Claim
28 words
An image forming apparatus according to claim 31, wherein control data for image formation are maintained constant in the respective control mode corresponding to a particular predetermined range.
Claim 37
Dependent Claim
28 words
An image forming apparatus according to claim 32, wherein said control data are initial values for driving said image forming means for control of the image forming conditions.
Claim 38
Dependent Claim
50 words
An image forming apparatus according to claim 1, wherein said control means is adapted to detect the image density of an original after controlling the image forming conditions in the desired control mode, and is adapted to further control the image forming conditions in accordance with the detected image density.
Claim 39
Dependent Claim
28 words
An image forming apparatus according to claim 30 wherein said control means controls said image forming conditions in accordance with a plurality of parameters including the image magnification.
Claim 40
Dependent Claim
33 words
A image forming apparatus according to claim 35, wherein the parameters include process speed, and said image forming means is capable of forming an image on the recording member at different process speeds.
References Cited (Backward Citations)
US3053962A
Cited
US3606534A
Cited
US4019102A
Cited
US4358520A
Cited
DE3015820A1
Cited
US4411514A
Cited
US4335953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |