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Image forming apparatus
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Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
An imaging device, a technology for carrying images, applied in the fields of equipment, instruments, optics, etc.
Inactive Publication Date: 2011-08-03
CANON KK
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Description
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Problems solved by technology
Therefore, the offset correction operation that has been carried out may have an adverse effect on the subsequent offset correction operation
It was thus found that no problem arises when the photosensitive member speed increase and photosensitive member speed decrease occur randomly, but the correction amount is only continuously increased in some cases beyond the maximum value of the position correction amount, resulting in a lack of adequate correction control. may fail
Method used
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no. 1 example
[0077] figure 1 is a schematic diagram showing the composition of the image forming apparatus of the first embodiment, figure 2 is a schematic diagram showing the composition of the primary transfer section and the secondary transfer section.
[0078] Such as figure 1 As shown, the image forming apparatus 100 of the first embodiment is a full-color laser beam printer in which image forming stations PY, PM, PC, and PK for yellow, cyan, magenta, and black are arranged along the intermediate transfer belt 9 .
[0079] At the image forming station PY, a yellow toner image is formed on and carried and conveyed by the photosensitive drum 1Y (first image bearing member), and then, at the first transfer portion TY, the yellow toner image passes through The first transfer device 5Y is primarily transferred onto the intermediate transfer belt (conveying member) 9 . At the image forming station PM, a magenta toner image is formed on and carried by the photosensitive drum 1M (second...
Embodiment 1
[0100] image 3 is a partial perspective view of the image forming apparatus of Embodiment 1, Figure 4 is a schematic diagram showing a first position mark formed on the first image bearing member, Figure 5 is a schematic diagram showing a conveying member position mark formed on a conveying member, Figure 6 is a schematic diagram showing a second position mark formed on the second image bearing member.
[0101] Figure 7 is displayed figure 1 A schematic diagram of the control used in the construct, Figure 8 is a block diagram showing the outline of control in Embodiment 1, Figure 9 Be the flow chart of control among the embodiment 1, Figure 10-14 They are the flow charts of the control of tasks 1-5 respectively.
[0102] Such as image 3 As shown, in Embodiment 1, the position mark (221) for each scanning line is magnetically recorded on the inner surface of the image bearing member (1Y, 1M, 1C, 1K). In synchronization with the first position mark (221) of th...
Embodiment 2
[0188] Figure 15 is a schematic diagram showing exposure control in Example 2, Figure 16 is a schematic showing the angular scale reader.
[0189] In Embodiment 2, a fixed optical scale is formed on the first image bearing member (1Y) (second image bearing member (1M)), and an electrostatic image is formed on the first image bearing member in synchronization with the detection of the optical scale reading timing. member (1Y) (second image bearing member (1M)). The first electrostatic image forming device (3Y) (second electrostatic image forming device (3M)) does not write scanning lines on the first image bearing member (1Y) (second image bearing member (1M)) by scanning writing, Instead, one scan line is written together by using a plurality of light emitting members (LED array) at regular intervals (equal pitch). The other compositions are the same as in Example 1, so descriptions and redundant explanations are omitted.
[0190] An angular scale 42Y (first position mar...
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Abstract
An image forming apparatus includes first and second image bearing members on which a toner images are to be formed; a conveying member onto which the toner images are to be transferred; a conveying member position index detecting device for detecting a conveying member position index provided on the conveying member along the movement direction of the conveying member; an image bearing member position index detecting device for detecting the image bearing member position indices provided on the second image bearing member along a rotational direction of the second image bearing member; an adjusting device for adjusting a rotational speed of the second image bearing member; a controller for controlling the adjusting device so as to adjust a position of an image bearing member position index correspondingly to the conveying member position index, on the basis of detection results of the conveying member position index detecting device and the image bearing member position index detecting device; and an initializing portion for performing an initializing operation of the adjusting device when an amount of deviation between the conveying member position index and the corresponding image bearing member position index is out of a predetermined range.
Description
technical field [0001] The present invention relates to an image forming apparatus that forms a mixed color image by superimposing a second color toner image on a first color toner image. Specifically, the present invention relates to a control for improving the accuracy of superposition between a first color toner image and a second color toner image. Background technique [0002] A tandem image forming apparatus that forms a full-color image by arranging a plurality of image bearing members (photosensitive drums, photosensitive belts, etc.) different in developing color along a conveying member (intermediate transfer belt, recording material conveying belt, etc.) has been put into use . In a tandem image forming apparatus, toner images are formed by a plurality of image bearing members parallel to each other but with different timings and transferred in an overlapping manner, so that the number of sheets to be imaged is enormous. Therefore, it is possible to realize hig...
Claims
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Application Information
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