EP0519710A2
Expired / Lapsed
EP
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Image forming apparatus having image forming condition controller responsive to test pattern image
Assignee: Canon Inc
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Filing: 1992-06-17
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Granted: —
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Expires: 2012-06-17
Abstract
Abstract An image forming apparatus includes an image bearing member movable along an endless path; an electrostatic latent image forming device for forming an electrostatic latent image on an image bearing member; a developing device for developing the latent image with toner into a toner image; a transfer device for transferring the toner image from the image bearing member onto a transfer material, wherein the latent image forming device, the developing device and the transfer device are disposed in the order named with respect to a direction of movement of the image bearing member during image formation; a detection pattern image forming device for forming a predetermined pattern image on the image bearing member; a detection pattern detecting sensor, disposed downstream of the transfer means with respect to the movement direction of the image bearing member and disposed faced to the image bearing member, for detecting a state of the detection pattern; and controller for controlling an image forming condition of the image forming apparatus in accordance with a detection by the sensor.
Inventors
- 👤 Masami C/O Canon Kabushiki Kaisha Izumizaki
- 👤 Yoshihiro c/o Canon Kabushiki Kaisha Murasawa
- 👤 Yoshinori c/o Canon Kabushiki Kaisha Nagao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5054; G03G15/5058; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; G03G15/1645; G03G15/5033; G03G15/5041; G03G2215/00; G03G2215/00025; G03G2215/00029; G03G2215/00033; G03G2215/00037; G03G2215/00042; G03G2215/0013
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
169 words
An image forming apparatus, comprising: an image bearing member movable along an endless path; electrostatic latent image forming means for forming an electrostatic latent image on an image bearing member; developing means for developing the latent image with toner into a toner image; transfer means for transferring the toner image from said image bearing member onto a transfer material, wherein said latent image forming means, said developing means and said transfer means are disposed in the order named with respect to a direction of movement of said image bearing member during image formation; detection pattern image forming means for forming a predetermined pattern image on said image bearing member; detection pattern detecting means, disposed downstream of said transfer means with respect to the movement direction of said image bearing member and disposed faced to said image bearing member, for detecting a state of the detection pattern; and control means for controlling an image forming condition of said image forming apparatus in accordance with a detection by said detecting means.
Claim 2
Dependent Claim
26 words
An apparatus according to Claim 1, wherein said detecting means forms a predetermined shaped toner image using said latent image forming means and said developing means.
Claim 3
Dependent Claim
17 words
An apparatus according to Claim 1, wherein said detecting means includes a light source and a photoreceptor.
Claim 4
Dependent Claim
193 words
An image forming apparatus, comprising: an image bearing member movable along an endless path; electrostatic latent image forming means for forming an electrostatic latent image on an image bearing member; developing means for developing the latent image with toner into a toner image; transfer means for transferring the toner image from said image bearing member onto a transfer material, wherein said latent image forming means, said developing means and said transfer means are disposed in the order named with respect to a direction of movement of said image bearing member during image formation; detection pattern image forming means for forming a predetermined pattern image on said image bearing member; detection pattern detecting means, disposed downstream of said transfer means with respect to the movement direction of said image bearing member and disposed faced to said image bearing member, for detecting a state of the detection pattern; control means for controlling an image forming condition of said image forming apparatus in accordance with a detection of said detecting means; transfer operation control means for controlling said transfer means when the detection pattern passes through an image transfer position where said transfer means is disposed.
Claim 5
Dependent Claim
29 words
An apparatus according to Claim 4, wherein said transfer operation control means stops a bias voltage to said transfer means when the detection pattern passes through the transfer position.
Claim 6
Dependent Claim
30 words
An apparatus according to Claim 4, wherein said transfer operation control means supplies to said transfer means a voltage having a polarity opposite from that during usual image transfer operation.
Claim 7
Dependent Claim
17 words
An apparatus according to Claim 4, wherein said detecting means includes a light source and a photoreceptor.
Claim 8
Dependent Claim
22 words
An apparatus according to Claim 4, wherein said image forming condition control means controls a transfer bias applied to said transfer means.
Claim 9
Dependent Claim
27 words
An apparatus according to Claim 4, wherein said image forming condition control means controls a potential of the latent image formed by said latent image forming means.
Claim 10
Dependent Claim
16 words
An apparatus according to Claim 4, wherein said image forming condition control means-controls said developing means.
Claim 11
Dependent Claim
213 words
An image forming apparatus, comprising: an image bearing member movable along an endless path; electrostatic latent image forming means for forming an electrostatic latent image on an image bearing member; developing means for developing the latent image with toner into a toner image; transfer means for transferring the toner image from said image bearing member onto a transfer material, wherein said latent image forming means, said developing means and said transfer means are disposed in the order named with respect to a direction of movement of said image bearing member during image formation; detection pattern image forming means for forming a predetermined pattern image on said image bearing member; detection pattern detecting means, disposed downstream of said transfer means with respect to the movement direction of said image bearing member and disposed faced to said image bearing member, for detecting a state of the detection pattern, wherein said detecting means detects the state before and after the detection pattern is transferred-by said transfer means; control means for controlling an image forming condition of said image forming apparatus in accordance with a detection of said detecting means; and transfer operation control means for controlling said transfer means when the detection pattern passes through an image transfer position where said image transfer means is disposed.
Claim 12
Dependent Claim
48 words
An apparatus according to Claim 11, wherein said image bearing member is rotatable in a direction opposite from that during image formation to permit the detection of said detecting means before and after the detection pattern is transferred, by which the states are detected by one detecting means.
Claim 13
Dependent Claim
80 words
Image forming apparatus in which an electrical image is formed on an image bearing member, the electrical image is developed into a toner image at a developing means, and the toner image is transferred to an image support means at a transfer means, the apparatus having means to form a test image on the image bearing member and means to detect the test image, characterised in that the means to detect the test image is downstream of the transfer means.
Claim 14
Dependent Claim
55 words
Image forming apparatus according to claim 13 in which the transfer means is operable in a transfer mode to transfer a toner image from the image bearing member to the image support means, and is operable in a non-transfer mode to allow the test image to pass without transferring it to the image support means.
Claim 15
Independent Claim
71 words
A method of operating an image forming apparatus in a test mode, in which a test image is formed on an image bearing member, and is detected by detection means, the test image being carried past an image transfer means for transferring images to another means, characterised by the step of maintaining the image transfer means in a mode for not transferring images while the test image is carried past it.
Claim 16
Independent Claim
84 words
A method of operating an image forming apparatus in a test mode, in which a test image is formed on an image bearing member and is detected by detection means, characterised in that the test image is transferred to another means subsequent to its detection by the detection means, and the location of the test image on the image bearing means is subsequently sensed, the location of the test image not being cleaned between the test image detection step and the location sensing step.
Claim 17
Dependent Claim
56 words
A method according to claim 16 in which the image bearing member is moved in a forward direction between the step of forming the test image and the step of detecting the test image, and is moved in a reverse direction between the step of detecting the test image and the step of sensing the location.
References Cited (Backward Citations)
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