US4326795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming process and apparatus therefor
Assignee: Canon Inc
•
Filing: 1979-10-11
•
Granted: 1982-04-27
•
Expires: 1999-10-11
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
- 👤 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
2026-11-03 18:06
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: 22
Claim 1
Independent Claim
154 words
Electrophotographic image forming apparatus, comprising: charging means for electrostatically charging a photosensitive member; light image projecting means for projecting a light image onto said photosensitive member charged by said charging means, thereby forming a latent image; developing means for developing said latent images; voltage applying means for applying a voltage to said developing means; non-imaged area exposure means for projecting light onto a non-imaged area of said photosensitive member; detecting means for detecting surface potential of a portion of said non-imaged area; control means for controlling the light from said non-imaged area exposure means at a predetermined amount at said portions of said non-imaged area and for increasing said light to an amount in excess of said predetermined amount after completion of image formation to provide uniform conditions for subsequent image formation; adjusting means for adjusting the output voltage of said voltage applying means in response to a detection output of said detecting means.
Claim 2
Dependent Claim
154 words
Electrophotographic image forming apparatus, comprising: charging means for electrostatically charging a photosensitive member; light image projecting means for projecting a light image onto said photosensitive member charged by said charging means, thereby forming a latent image; developing means for developing said latent images; voltage applying means for applying a voltage to said developing means; non-imaged area exposure means for projecting light onto a non-imaged area of said photosensitive member; detecting means for detecting surface potential of a portion of said non-imaged area; control means for controlling the light from said non-imaged area exposure means at a predetermined amount at said portions of said non-imaged area and for increasing said light to an amount in excess of said predetermined amount after completion of image formation to provide uniform conditions for subsequent image formation; adjusting means for adjusting the output voltage of said voltage applying means in response to a detection output of said detecting means.
Claim 3
Dependent Claim
33 words
Image forming apparatus according to claim 1 wherein said photosensitive member includes a 3-layered photosensitive member comprising an insulating layer, a photoconductive layer and a electroconductive layer in succession from a surface thereof.
Claim 4
Dependent Claim
27 words
Image forming apparatus according to claim 2, further comprising charge eliminating means for eliminating charge from an area to be exposed by said light image projecting means.
Claim 5
Dependent Claim
28 words
Image forming apparatus according to claim 1, wherein said bias voltage is a voltage equal to a detection voltage of said detecting means superimposed with a determined voltage.
Claim 6
Dependent Claim
17 words
Image forming apparatus according to claim 1, wherein said projecting means is different from said exposure means.
Claim 7
Dependent Claim
158 words
Electrophotographic copying apparatus, comprising: a rotary recording member; charging means for charging said recording member; an original support table for supporting an original; scanning means for performing consecutive reciprocating motions to scan the original to thereby consecutively form a plurality of electrostatic latent images on said photosensitive member corresponding to said original; developing means for developing said latent images; voltage applying means for applying a voltage to said developing means; projecting means for projecting a predetermined amount of light onto a non-imaged area present between two consecutive latent images on said recording member; detecting means for detecting surface potential of said non-imaged area; and control means for controlling said voltage applying means according to a detection output from said detecting means during development of the latent image present next to said non-imaged area in said developing means, wherein said projecting means is activated upon moving oppositely to the direction of said scanning means movement for scanning an original.
Claim 8
Dependent Claim
158 words
Electrophotographic copying apparatus, comprising: a rotary recording member; charging means for charging said recording member; an original support table for supporting an original; scanning means for performing consecutive reciprocating motions to scan the original to thereby consecutively form a plurality of electrostatic latent images on said photosensitive member corresponding to said original; developing means for developing said latent images; voltage applying means for applying a voltage to said developing means; projecting means for projecting a predetermined amount of light onto a non-imaged area present between two consecutive latent images on said recording member; detecting means for detecting surface potential of said non-imaged area; and control means for controlling said voltage applying means according to a detection output from said detecting means during development of the latent image present next to said non-imaged area in said developing means, wherein said projecting means is activated upon moving oppositely to the direction of said scanning means movement for scanning an original.
Claim 9
Dependent Claim
19 words
Image forming apparatus according to claim 6, wherein said recording member includes a photosensitive member comprising a photoconductive layer.
Claim 10
Dependent Claim
15 words
Image forming apparatus according to claim 6, wherein said recording member comprises a photosensitive member.
Claim 11
Dependent Claim
33 words
Image Forming Apparatus according to claim 8, wherein said photosensitive member includes a 3-layered photosensitive member comprising an insulating layer, a photoconductive layer and an electroconductive layer in succession from a surface thereof.
Claim 12
Dependent Claim
21 words
Image forming apparatus according to claim 9, further comprising charge eliminating means for eliminating charge from an area to be exposed.
Claim 13
Dependent Claim
34 words
Image forming apparatus according to claim 6, wherein a scanning of the original is performed during forward motion of said scanning means, said projecting means being activated during backward motion of said scanning means.
Claim 14
Dependent Claim
21 words
Image forming apparatus according to claim 6, wherein said detecting means is activated during said backward motion of said scanning means.
Claim 15
Dependent Claim
53 words
Image forming apparatus according to claim 6 or claim 9, wherein said scanning means comprises: an exposure lamp for exposing an original disposed on an original support table; and an optical system for forming an image onto said recording member through reflecting light from said original and said exposure lamp performs reciprocating motions.
Claim 16
Dependent Claim
17 words
Image forming apparatus according to claim 13, wherein said exposure lamp is different from said projecting means.
Claim 17
Dependent Claim
146 words
Image forming apparatus, comprising: a rotary photosensitive member; a plurality of processing means for projecting a light image onto said photosensitive member thereby consecutively forming electrostatic latent images corresponding to said light image; developing means for developing said latent images; voltage applying means for applying a voltage to said developing means; projecting means for projecting a determined amount of light onto a non-imaged area present between two consecutive latent images on said photosensitive member; detecting means for detecting a surface potential of said non-imaged area; and control means for controlling said voltage applying means according to a detection output from said detecting means during development of a latent image next to said non-imaged area, wherein said projecting means is adapted to project an amount of light in excess of the aforementioned determined amount of light onto said photosensitive member after formation of a final latent image.
Claim 18
Dependent Claim
146 words
Image forming apparatus, comprising: a rotary photosensitive member; a plurality of processing means for projecting a light image onto said photosensitive member thereby consecutively forming electrostatic latent images corresponding to said light image; developing means for developing said latent images; voltage applying means for applying a voltage to said developing means; projecting means for projecting a determined amount of light onto a non-imaged area present between two consecutive latent images on said photosensitive member; detecting means for detecting a surface potential of said non-imaged area; and control means for controlling said voltage applying means according to a detection output from said detecting means during development of a latent image next to said non-imaged area, wherein said projecting means is adapted to project an amount of light in excess of the aforementioned determined amount of light onto said photosensitive member after formation of a final latent image.
Claim 19
Dependent Claim
33 words
Image forming apparatus according to claim 11, wherein said photosensitive member includes a 3-layered photosensitive member comprising an insulating layer, a photoconductive layer and an electroconductive layer in succession from a surface thereof.
Claim 20
Dependent Claim
21 words
Image forming apparatus according to claim 16 further comprising charge eliminating means for eliminating charge from an area to be exposed.
Claim 21
Dependent Claim
37 words
Image forming apparatus according to claim 15, wherein said processing means comprises: an original support table for supporting an original a projecting lamp for projecting said original, and a charger for charging said photosensitive member in advance.
Claim 22
Dependent Claim
17 words
Image forming apparatus according to claim 18, wherein said projecting means is different from said projecting lamp.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |