US4484811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming an image on a recording member
Assignee: Canon Inc
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Filing: 1981-12-09
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Granted: 1984-11-27
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Expires: 2001-12-09
Abstract
Abstract The image forming method is executed by projecting a light image on a rotatable recording member to consecutively form electrostatic latent images corresponding to the light image, developing the latent images, projecting a predetermined amount of light onto a non-imaged area present between two consecutive latent images on the recording member to form an electrostatic image, detecting potential of the electrostatic image, and controlling the development of the latent images next to the electrostatic image detected during the detection of the potential in response to the detection results. This method is performed in the image forming apparatus which includes a rotatable recording member, processing units for projecting a light image onto the recording member to consecutively form electrostatic latent images corresponding to the light image, a developer unit for developing the latent images, a voltage applying circuit for applying a voltage to the developer unit, a projecting unit for projecting a predetermined amount of light onto a non-imaged area present between two consecutive latent images on the recording member, a detector for detecting surface potential of the non-imaged area, and a controller for controlling the voltage applying circuit in response to detection output from the detector in the development of the latent image next to the non-imaged area in the developer unit.
Inventors
- 👤 Kimio Nakahata
- 👤 Hatsuo Tajima
- 👤 Naoki Iwami
- 👤 Shunichi Masuda
- 👤 Katsuichi Shimizu
- 👤 Yoshihiro Kawatsura
- 👤 Koji Suzuki
- 👤 Yoshikazu Yokomizo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5037; G03G15/06; G03G15/065; G03G15/22; G03G15/28; G03G15/30
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
82 words
Image forming apparatus, comprising: detecting means for detecting surface potential of a recording member; a plurality of processing means for forming an electrostatic latent image on said recording member; and a plurality of adjusting means for adjusting said processing means so as to set the surface potential which is formed on said recording member in different operation modes, to respectively different target values; said detecting means being adapted to provide approximately the same detection output with respect to said different target values.
Claim 2
Dependent Claim
82 words
Image forming apparatus, comprising: detecting means for detecting surface potential of a recording member; a plurality of processing means for forming an electrostatic latent image on said recording member; and a plurality of adjusting means for adjusting said processing means so as to set the surface potential which is formed on said recording member in different operation modes, to respectively different target values; said detecting means being adapted to provide approximately the same detection output with respect to said different target values.
Claim 3
Dependent Claim
27 words
Image forming apparatus according to claim 1, wherein said detecting means comprises a detecting electrode and shielding means for shielding said detecting electrode from said recording member.
Claim 4
Dependent Claim
36 words
Image forming apparatus according to claim 2, further comprising bias applying means for applying a bias voltage to said shielding means such that difference between said different target potentials and said bias voltage is kept constant.
Claim 5
Dependent Claim
22 words
Image forming apparatus according to claim 1, wherein one of said processing means comprises charging means for uniformly charging said recording member.
Claim 6
Dependent Claim
23 words
Image forming apparatus according to claim 4, wherein said adjusting means comprises a charging adjustment member for adjusting output from said charging means.
Claim 7
Dependent Claim
34 words
Image forming apparatus according to claim 5, wherein said recording member comprises a photosensitive member, said apparatus further comprising exposure means for projecting light onto said photosensitive member after charging by said charging means.
Claim 8
Dependent Claim
38 words
Image forming apparatus according to claim 6, wherein one of said operation modes is a mode for projecting light onto said photosensitive member by said exposure means, another being a mode not projecting light onto said photosensitive member.
Claim 9
Dependent Claim
24 words
Image forming apparatus according to claim 7, wherein said charging adjustment member is adjusted in said mode not projecting light onto said photosensitive member.
Claim 10
Dependent Claim
28 words
Image forming apparatus according to claim 7, wherein said adjusting means further comprises a light amount adjusting member for adjusting an amount of light from said exposure means.
Claim 11
Dependent Claim
25 words
Image forming apparatus according to claim 9, wherein said light amount adjusting member is adjusted in said mode for projecting light onto said photosensitive member.
Claim 12
Dependent Claim
22 words
Image forming apparatus according to claim 1, further comprising control means for selectively driving said processing means according to said operation modes.
Claim 13
Dependent Claim
23 words
Image forming apparatus according to claim 1, further comprising display means for displaying, in distinct levels, the detection output from said detecting means.
Claim 14
Dependent Claim
90 words
Image forming apparatus comprising: operative means, including a plurality of operable parts, for forming an image on a recording member; instruction means for selectively instructing the performance of first and second different tests on operative functions of the image forming means; and control means for controlling the operation of said operable parts in the performance of said tests under instruction by said instruction means, such that a particular one of said operable parts is caused to operate in both the first and second tests, but in different respective operational states.
Claim 15
Dependent Claim
90 words
Image forming apparatus comprising: operative means, including a plurality of operable parts, for forming an image on a recording member; instruction means for selectively instructing the performance of first and second different tests on operative functions of the image forming means; and control means for controlling the operation of said operable parts in the performance of said tests under instruction by said instruction means, such that a particular one of said operable parts is caused to operate in both the first and second tests, but in different respective operational states.
Claim 16
Dependent Claim
33 words
Image forming apparatus according to claim 13 wherein said instruction means comprises first and second means for producing respective first and second instructions for the performance of the respective first and second tests.
Claim 17
Dependent Claim
18 words
Image forming apparatus according to claim 14 wherein said first and second means comprise respective independently operable switches.
Claim 18
Dependent Claim
34 words
Image forming apparatus according to either one of claims 13 and 14, wherein said control means is arranged to cause the operation in said first and second tests of a combination of operable parts.
Claim 19
Dependent Claim
22 words
Image forming apparatus according to claim 16 wherein said combination of operable parts comprises an illuminating means and an electrical charging means.
Claim 20
Dependent Claim
51 words
Image forming apparatus according to claim 17 wherein said image forming means comprises a first lamp means for illuminating an original of which an image is to be formed on the recording medium, and said illuminating means comprises a second lamp means for uniformly exposing the recording member to illuminating light.
Claim 21
Dependent Claim
28 words
Image forming apparatus according to claim 17 or claim 18 wherein said combination of operable parts also includes means for detecting a surface condition of the recording member.
Claim 22
Dependent Claim
22 words
Image forming apparatus according to claim 19 wherein said surface condition is the electrical potential at the surface of said recording member.
Claim 23
Dependent Claim
20 words
Image forming apparatus according to claim 18 wherein said particular one of said operable parts comprises said second lamp means.
Claim 24
Dependent Claim
32 words
Image forming apparatus according to claim 21 wherein said second lamp means produces a relatively high and a relatively low light output, respectively, in said first and second operation of states thereof.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |