JP2005338140A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain scattering of toner so as to reduce the total amount of toner in a color developing machine. <P>SOLUTION: In a multicolor image forming apparatus having two photosensitive drums and two intermediate transfer bodies, color application is controlled. In addition, the number of times that primary transfer is carried out on each of the intermediate transfer bodies is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image forming apparatus that forms an image using an electrophotographic system, and more particularly, to an image forming apparatus such as a copying machine, a printer, a FAX, or a multifunction machine having a plurality of these functions.

  An electrophotographic image forming apparatus in which the number of developer colors is increased compared to a conventional four-color image forming apparatus has been proposed and partially realized. In addition to the conventional four colors of cyan (hereinafter referred to as Y), magenta (hereinafter referred to as M), yellow (hereinafter referred to as Y), and black (hereinafter referred to as K), for example, red, blue, green, gold, silver, fluorescent color There are various types such as those that correspond to special colors such as those that add light cyan (hereinafter light C) and light magenta (hereinafter light M) that are common in the inkjet method, but the purpose is to differentiate each image quality. It is.

  There are various types of image forming apparatuses in which the number of developer colors is increased. For example, an image forming apparatus as shown in FIG. 1 is one of the image forming apparatuses using six types of developers (toners). There is.

  The image forming apparatus of FIG. 1 uses two rotationally moving photosensitive drums, and the size of the image forming apparatus is reduced and the number of parts is reduced as compared with a configuration in which the number of developing units and the number of photosensitive drums are the same. Thus, the cost can be reduced, and the speed of an image can be increased as compared with an image forming apparatus in which a single photosensitive drum is used and a large number of developing units are associated therewith. That is, the apparatus was invented as an inexpensive and small-sized image forming apparatus that can provide high-quality images at high speed.

  Next, the configuration will be briefly described. Two drum-shaped photosensitive members (photosensitive drums) as image carriers, that is, the first photosensitive drum 1a and the second photosensitive drum 1b are each rotated in the direction of the arrow in the figure. Each of the photosensitive drums 1a and 1b is surrounded by pre-exposure lamps 11a and 11b, corona chargers (charging means) 2a and 2b, and laser exposure optics. Development of different colors on the first exposure means 3a, second exposure means 3b, potential sensors 12a, 12b, movable bodies (development rotary) 4a, 4b, which are rotary developing device holding portions, and the respective holding portions Three developing units 41 to 43 and 44 to 46 containing the agent, primary transfer rollers 5a and 5b as primary transfer means, and cleaning units 6a and 6b are arranged.

  Next, the operation during image formation will be described.

  First, the original read by the reader unit 300 is converted into an optical signal in the laser exposure optical systems 3a and 3b as exposure means, and the laser beam E of the optical signal is projected onto the surfaces of the photosensitive drums 1a and 1b.

  At the time of image formation, the photosensitive drums 1a and 1b are rotated in the direction of the arrow A, and the photosensitive drums 1a and 1b after being neutralized by the pre-exposure lamps 11a and 11b are uniformly charged by the chargers 2a and 2b, respectively. A light image E is irradiated every time to form a latent image on the photosensitive drums 1a and 1b.

  Next, the rotary developing device holding section, that is, the first developing rotary 4a and the second developing rotary 4b, which are moving bodies, are rotated, and predetermined developing devices 41 and 44 are moved to the respective developing devices 41 to 41 on the photosensitive drums 1a and 1b. 43, or after moving to the common developing units 40a and 40b between the developing units 44 to 46, the developing units 41 and 44 are operated to invert the electrostatic latent images on the photosensitive drums 1a and 1b. Development is performed to form toner images on the photosensitive drums 1a and 1b. At this time, a developing bias is applied to the developing device.

  The toner images formed on the respective photosensitive drums 1a and 1b are superimposed on an intermediate transfer member (intermediate transfer belt) 5 as a transfer medium by primary transfer rollers 5a and 5b serving as primary transfer units. The primary transfer is sequentially performed so as to be formed. At this time, a primary transfer bias is applied to the primary transfer rollers 5a and 5b. As a result, the respective toner images are sequentially superimposed on the intermediate transfer belt 5 to form a full color toner image.

  Thereafter, the full-color toner image on the intermediate transfer belt 5 as a transfer medium is secondarily transferred collectively onto a sheet as a recording material. At this time, a secondary transfer bias is applied to the secondary transfer roller 54.

Further, the transfer cleaning device 50 facing the drive roller 51 on the upstream side of the intermediate transfer belt 5 finishes superimposing images of necessary colors on the intermediate transfer belt 5, and is then pressed by the drive roller 51 facing to record. The residual toner on the intermediate transfer belt 5 after being transferred to the material is cleaned. After the cleaning is completed, the transfer cleaning device 50 is separated from the intermediate transfer belt 5.
JP 2004-029056 A

  The color image forming apparatus shown in FIG. 1 is an apparatus that transfers a plurality of colors.

  In order to form an image of a predetermined color, the conventional image forming apparatus sequentially superimposes toner images of colors formed by the developing devices 41 to 46. For example, in the case of four colors, the intermediate transfer medium is rotated four times and transferred onto an intermediate transfer member on which toner for four colors is placed. However, with this method, scattering occurred during the four primary transfers. Various techniques have been conceived to solve this problem, and an effective four-color image forming apparatus has been used. However, when the number of colors becomes six, the intermediate transfer medium is rotated six times, so that the occurrence rate of scattering increases. At present, it is in a state that cannot be handled with the ability of four colors.

  In addition, since the number of rotations is increased, the life of the intermediate transfer medium may be shortened.

  Therefore, the present invention has been made in view of the above problems, and in a multicolor image forming apparatus including a plurality of image forming units and at least two intermediate transfer media, the number of times of primary transfer on the intermediate transfer member is reduced. Accordingly, an object of the present invention is to provide an image forming apparatus that can solve the above-described problems.

  The above object is achieved by the image forming apparatus of the present invention.

  In summary, the present invention includes a first image carrier and a plurality of developing devices, and one of these is rotated to the development position of the first image carrier and developed. A first image forming unit including a moving body, a second image carrier, and a plurality of developing units, one of which is rotated to the development position of the second image carrier and developed. A second image forming unit having a second moving body, a first and second charging unit for uniformly charging surfaces on the first and second image carriers, and a charged surface. A first and second exposure means for forming an electrostatic latent image, and a charged developer is attached to the electrostatic latent images on the first and second image carriers to form a visible image. First and second image forming means; at least two intermediate transfer media; means for separating and pressing the two intermediate transfer media; and first and second images First and second transfer means for transferring a visible image from a holder to the corresponding intermediate transfer medium, and a toner image by a plurality of corresponding image forming means is transferred onto the first intermediate transfer medium by the transfer means. At the same time, the toner images formed by a plurality of corresponding toner image forming units are superimposed and transferred onto the second intermediate transfer medium by the transfer unit, and finally the second intermediate transfer medium is transferred onto the first intermediate transfer medium. The toner image on the intermediate transfer medium is transferred in a superimposed manner. The means for separating and pressurizing the first and second intermediate transfer media is a roller that brings one place of the first intermediate transfer medium and one place of the second intermediate transfer medium into close contact with each other. Close contact by pressurization is possible.

  When starting the last toner image formation on the first and second intermediate transfer media, pressurizing means is applied to finish the toner image formation on the first and second intermediate transfer media. After that, the pressurizing means is pressurized. When the toner image formed on the second intermediate transfer medium is transferred onto the first intermediate transfer medium, the number of colors forming the toner image formed on the second intermediate transfer medium is variable.

  An image is formed using a developer expressing cyan, magenta, yellow, and black.

  Dark and light color developers can be used.

  When the last toner image is formed on the first and second intermediate transfer media, if the pressurizing unit is pressurizing, yellow, black, magenta, cyan, light magenta, and light cyan When the color application control is performed for each intermediate transfer medium and the pressurizing unit is separated, the colors are applied in the order of black, cyan, and light cyan on the first intermediate transfer medium, and at the same time, the second After controlling the color application in the order of yellow, magenta, and light magenta on the intermediate transfer medium, the toner image of black + cyan + light color cyan + light color magenta + yellow + magenta is transferred to the first intermediate transfer medium. The toner image of the second intermediate transfer medium is transferred onto the second intermediate transfer medium.

  The first moving body developer contains developers expressing black, cyan, and light cyan, and the second moving body developer contains yellow, magenta, and light color magenta. Is to provide an image forming apparatus.

  As described above, according to the present invention, the image forming apparatus of the present invention has two image carriers and at least two intermediate transfer media, and forms a full-color image using six colors of toner. Therefore, the number of rotations required for the primary transfer of the required intermediate transfer belt can be made up to three colors at the maximum. As a result, in a four-color image forming apparatus, a technique effective for scattering can be used as it is (for three colors), toner scattering can be suppressed, and image quality deterioration can be suppressed. In addition, it is not necessary to newly take measures to prevent scattering corresponding to the six-color image forming apparatus, so that the cost can be reduced.

  Further, it can be said that the intermediate transfer member is also excellent in terms of durability.

  In addition, the time required for image formation can be shortened.

  In the image forming apparatus having the above-described effects, the image forming apparatus is particularly limited to an image forming apparatus provided with two rotationally movable photosensitive drums. can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 is a schematic sectional view of a full-color image forming apparatus (a multi-function machine having both a copying function, a printer function, and a FAX function) according to an embodiment of the present invention. This example has a digital color image reader unit 300 at the top and a digital color image printer unit 101 at the bottom.

  Here, the operation of the printer unit 101 will be described based on a signal from the reader unit 300.

  The printer unit 101 includes a first unit and a second unit which are roughly divided into two image forming units.

  FIG. 3 is an enlarged view of a portion 102 in the printer unit 101. The first unit and the second unit will be described in detail using this figure.

  The first unit includes a drum-shaped photosensitive member (photosensitive drum) as an image carrier, that is, a first photosensitive drum 1a, a movable member (developing rotary) 4a that is a rotary developing device holding portion, an intermediate transfer belt 5A, and a front. An exposure lamp 11a, a corona charger (charging means) 2a, a potential sensor 12a, three developing devices 41 to 43 each containing developer of different colors in each holding portion, a primary transfer roller 5a as a primary transfer means, It consists of a cleaning device 6a.

  The second unit includes a drum-shaped photosensitive member (photosensitive drum) as an image carrier, that is, a first photosensitive drum 1b, a movable member (developing rotary) 4b which is a rotary developing device holding portion, an intermediate transfer belt 5B, and a front. An exposure lamp 11b, a corona charger (charging means) 2b, a potential sensor 12b, three developing devices 44 to 46 each containing a developer having a different color, and a primary transfer roller 5a as a primary transfer means It consists of a cleaning device 6a.

  Next, a configuration using six developing devices 41 to 46 will be described.

  The developing unit includes a thin C toner 41 (light C), 42 C toner, 43 K toner, 44 Y toner, 45 M toner, 46 thin M toner (light M) is loaded.

  Here, the dark and light color developers are prepared by changing the amount of the pigment having the same spectral characteristics.

  Therefore, the light M toner has the same spectral characteristics as the magenta pigment but a low content, and the light C toner has the same spectral characteristics as the cyan but a low content.

  Here, the use of dark and light colors for magenta and cyan is intended to dramatically improve the reproducibility of light images such as human skin.

  Further, the operation will be described in detail with reference to FIGS.

  In the laser exposure optical systems 3a and 3b as exposure means, the image signal from the reader unit 300 is converted into an optical signal by a laser output unit (not shown), and the laser beam E converted into the optical signal is converted into a polygon mirror (not shown). The light is reflected on the surface of the photosensitive drums 1a and 1b through a lens (not shown) and each reflecting mirror (not shown).

  When the printer unit 100 forms an image, in the first unit, the photosensitive drum 1a is rotated in the direction of arrow A, and the photosensitive drum 1a after being neutralized by the pre-exposure lamp 11a is uniformly charged by the charger 2a. A light image E is irradiated every time to form a latent image on the photosensitive drum 1a. Further, in the second unit, the photosensitive drum 1b is rotated in the direction of arrow B, and the photosensitive drum 1b after being neutralized by the pre-exposure lamp 11b is uniformly charged by the charger 2b. To form a latent image on the photosensitive drum 1b.

  Next, the rotary developing device holding section, that is, the first developing rotary 4a and the second developing rotary 4b, which are moving bodies, are rotated, and predetermined developing devices 41 and 44 are moved to the respective developing devices 41 to 41 on the photosensitive drums 1a and 1b. 43, or after moving to the common developing units 40a and 40b between the developing units 44 to 46, the developing units 41 and 44 are operated to invert the electrostatic latent images on the photosensitive drums 1a and 1b. Development is performed to form developer images (toner images) on the photosensitive drums 1a and 1b.

  At this time, a developing bias is applied to the developing device.

  The toner images formed on the photosensitive drums 1a and 1b are transferred onto intermediate transfer bodies (intermediate transfer belts) 5A and 5B as transfer media by primary transfer rollers 5a and 5b, which are primary transfer units, respectively. Are sequentially transferred so as to overlap each other. At this time, a primary transfer bias is applied to the primary transfer rollers 5a and 5b. As a result, the toner images are sequentially superimposed on the intermediate transfer belts 5A and 5B to form a full color toner image.

  Thereafter, the full-color toner images on the intermediate transfer belts 5A and 5B, which are transfer media, are secondarily transferred collectively onto a sheet as a recording material. At this time, a secondary transfer bias is applied to the secondary transfer roller 54.

  The transfer method will be described in detail later.

  The intermediate transfer belts 5A and 5B are driven by the driving roller 51, and the transfer cleaning devices 50a and 50b are configured to be able to contact and separate from the driving rollers 51 and 52 at opposing positions sandwiching the intermediate transfer belts 5A and 5B.

  The photosensitive drums 1a and 1b are provided on the transfer surface t1, which is the same plane portion formed by stretching the intermediate transfer belts 5A and 5B by two rollers 51 and 52, and these photosensitive drums 1a and 1b are provided. Primary transfer rollers 5a and 5c, which are primary transfer means, are provided on the opposite sides of the intermediate transfer belts 5A and 5B.

  In addition, the roller that forms the transfer surface t1 is opposed to the driven roller 5b in the moving direction B1 (in the direction of the arrow in the figure) of the intermediate transfer belt 5A of the first unit. A sensor (not shown) for detecting the density is disposed, and the first unit is controlled to correct the image density, the toner replenishment amount, the image writing timing, the image writing start position, and the like as needed.

  Further, the roller forming the transfer surface t2 is opposed to the driven roller 5d in the moving direction D1 (in the direction of the arrow in the drawing) of the intermediate transfer belt 5B of the second unit, and the positional deviation of the image transferred from the drum 1b and A sensor (not shown) for detecting the density is disposed, and the second unit is controlled to correct the image density, the toner replenishment amount, the image writing timing, the image writing start position, and the like as needed.

  The transfer cleaning devices 50a and 50b, after having finished superimposing images of necessary colors on the intermediate transfer belts 5A and 5B, are pressed by the opposing drive rollers 51 and 52 and transferred to the recording material, and then transferred to the recording material. The remaining toner on 5B is cleaned. After cleaning, the transfer cleaning devices 50a and 50b are separated from the intermediate transfer belts 5A and 5B.

  On the other hand, the recording material is conveyed one by one from the storage units 71 to 72, and the secondary transfer roller 54, which is a secondary transfer means for transferring the toner image on the intermediate transfer belt 5A to the recording material at a desired timing, and the intermediate transfer. It is conveyed to a secondary transfer portion between the belt 5A.

  A toner image is transferred onto the recording material in the secondary transfer unit, the recording material passes through the conveyance unit 86, and the toner image is fixed by the heat roller fixing device 9, and is discharged to a paper discharge tray (not shown) or a paper post-processing device. The paper is discharged (not shown). On the other hand, the intermediate transfer belt 5A after the secondary transfer is cleaned with the transfer residual toner by the transfer cleaning device 50a as described above, and again used for the primary transfer process of each of the image forming unit first unit and second unit.

  Next, the transfer method will be described in detail with reference to the flowchart of FIG.

In response to the control signal, the optical image E is received for each separated color, and the formation of a toner image on the photosensitive drum 1a is started. (S100)
Next, it is confirmed whether or not the intermediate transfer member rollers R1 and R2 are pressurized. (S101)
When a pressurization signal is received, the first unit and the second unit operate alternately to put toner on each unit. (S102 will be described in detail later)
Next, when all the toner images are loaded, an end signal is sent to control the separation between the intermediate transfer member rollers R1 and R2. (S107)
In S101, when a separation signal is received, first, K, C, and light C toner images are sequentially placed on the intermediate transfer member 5A of the first unit. Next, Y, M, and light M toner images are sequentially placed on the intermediate transfer member 5B of the second unit. (S103 will be described in detail later)
Next, it is confirmed whether or not the final toner image is formed under the control of a CPU (not shown). (S104)
When a YES signal is received, the intermediate transfer member rollers R1 and R2 are pressurized. (S105)
If the signal is NO, the process returns to toner image formation again. (S103)
Next, when the intermediate transfer member rollers R1 and R2 are pressurized, the toner image of the intermediate transfer member 5B of the second unit is superimposed on the intermediate transfer member 5A of the first unit, and finally the intermediate transfer member. All toner images are transferred to 5A. (S106)
Next, when all the toner images are transferred to the intermediate transfer member 5A, the intermediate transfer member rollers R1 and R2 are separated. (S107)
The toner image formation ends. (S108)
All control is performed by a CPU (not shown) in a control circuit (not shown) of the image forming apparatus of the present invention.

  Next, the control of S102 will be described in detail using the flowchart of FIG.

First, a Y toner image is placed on the second unit and transferred to the intermediate transfer member 5B. (S201)
Next, the Y toner image is transferred from the intermediate transfer member 5B to the intermediate transfer member 5A via the intermediate transfer member rollers R1 and R2. (S202)
Next, in the first unit, the K toner image is placed and transferred to the intermediate transfer member 5A. (S203)
Next, in the second unit, the M toner image is placed and transferred to the intermediate transfer member 5B. (S204)
Next, the M toner image is transferred from the intermediate transfer member 5B to the intermediate transfer member 5A via the intermediate transfer member rollers R1 and R2. (S205)
Next, in the first unit, the C toner image is placed and transferred to the intermediate transfer member 5A. (S206)
Next, in the second unit, the light M toner image is placed and transferred to the intermediate transfer member 5B. (S207)
Next, the light M toner image is transferred from the intermediate transfer member 5B to the intermediate transfer member 5A via the intermediate transfer member rollers R1 and R2. (S205)
Next, in the first unit, the light C toner image is placed and transferred to the intermediate transfer member 5A. (S206)
All color toner images are transferred to the intermediate transfer member 5A. (S210)
The intermediate transfer member rollers R1 and R2 are separated from each other. (S107)
The secondary transfer unit is controlled. (S212)
Next, the control of S103 will be described in detail using the flowchart of FIG.

First, in the first unit, a K toner image is placed (S501) and transferred to the intermediate transfer member 5A. (S502)
Next, a C toner image is placed (S503) and transferred to the intermediate transfer member 5A. (S502)
Next, a light C toner image is placed (S505) and transferred to the intermediate transfer member 5A. (S502)
Simultaneously with the above operation, in the second unit, a Y toner image is placed (S601) and transferred to the intermediate transfer member 5B. (S602)
Next, an M toner image is placed (S603) and transferred to the intermediate transfer body 5B. (S602)
Next, a light M toner image is placed (S604) and transferred to the intermediate transfer member 5B. (S602)
Next, the intermediate transfer member rollers R1 and R2 are pressurized. (S105)
Next, the toner image of the intermediate transfer member 5B is transferred onto the intermediate transfer member 5A in the order of K + C + light C + light M + M + Y. (S106)
Finally, all the toner images are transferred to the intermediate transfer member 5A. (S401)
The intermediate transfer member rollers R1 and R2 are separated from each other. (S107)
The secondary transfer unit is controlled. (S212)
As described above, in the present exemplary embodiment, the toner image formed on the photosensitive drums 1a and 1b is transferred to the intermediate transfer belt by the first unit and the second unit of the image forming unit using the configuration using two intermediate transfer members. 5A and 5B are overprinted, and finally all colors are overlaid on the intermediate transfer belt 5A. For this reason, the intermediate transfer belts 5A and 5B only need to pass through the respective primary transfer portions three times.

  Therefore, compared to the image forming apparatus 101 shown in FIG. 1, the number of rotations required for the primary transfer of the intermediate transfer belt required to form a full color image using six colors of toner is set to a maximum of three colors. Can do.

  Further, when the intermediate transfer roller is separated, the first unit and the second unit can simultaneously transfer, so that the transfer time can be shortened, and finally the image formation is performed. The required time can be shortened.

It is a schematic block diagram which shows the image forming apparatus which concerns on a prior art example. It is a figure for demonstrating the image forming apparatus of this invention. FIG. 4 is a diagram for explaining the toner image forming method of the present invention in more detail. 3 is a flowchart for explaining a toner image forming method of the present invention. FIG. 6 is a diagram for explaining a control flow of the toner image forming method of the present invention. FIG. 6 is a diagram for explaining a control flow of the toner image forming method of the present invention.

Explanation of symbols

1a First photosensitive drum (image carrier)
1b Second photosensitive drum (image carrier)
3a, 3b Laser exposure optical system (exposure means)
4a First developing rotary (moving body)
4b Second developing rotary (moving body)
5A First intermediate transfer belt (transfer medium)
5B Second intermediate transfer belt (transfer medium)
R1 first intermediate transfer roller R2 second intermediate transfer roller 40a, 40b developing unit 41-46 developing unit first unit first image forming unit second unit second image forming unit

Claims (11)

A first image carrier including a first image carrier and a plurality of developing units, wherein the first image carrier includes a first moving body that rotates and develops one of them to the development position of the first image carrier; A second moving body that has an image forming means, a second image carrier, and a plurality of developing devices, and rotates one of them to the development position of the second image carrier and develops it. A second image forming means comprising:
First and second charging means for uniformly charging the surfaces on the first and second image carriers and first and second for exposing the charged surface to form an electrostatic latent image. Exposure means; first and second image forming means for forming a visible image by attaching a charged developer to the electrostatic latent images on the first and second image carriers; and
At least two intermediate transfer media;
Means for separating and pressurizing the two intermediate transfer media;
First and second transfer means for transferring a visible image from the first and second image carriers to the corresponding intermediate transfer medium;
A toner image from a plurality of corresponding image forming units is superimposed and transferred onto the first intermediate transfer medium by the transfer unit, and at the same time, onto a second intermediate transfer medium by a plurality of corresponding toner image forming units. 2. The toner image according to claim 1, wherein the toner image is superimposed and transferred by the transfer means, and finally the toner image on the second intermediate transfer medium is superimposed and transferred onto the first intermediate transfer medium. Image forming apparatus.   The means for separating and pressurizing the first and second intermediate transfer media is a roller that brings one place of the first intermediate transfer medium and one place of the second intermediate transfer medium into close contact with each other. The image forming apparatus according to claim 1, wherein the image forming apparatus is capable of being closely spaced by pressurization.   5. The image forming apparatus according to claim 1, wherein when the last toner image is formed on the first and second intermediate transfer media, the pressurizing unit is pressurized.   4. The image forming apparatus according to claim 1, wherein after the toner image formation on the first and second intermediate transfer media is finished, the pressurizing unit is pressurized.   When the toner image formed on the second intermediate transfer medium is transferred onto the first intermediate transfer medium, the number of colors forming the toner image formed on the second intermediate transfer medium is variable. The image forming apparatus according to claim 1, wherein:   6. The image forming apparatus according to claim 1, wherein an image is formed using a developer expressing cyan, magenta, yellow, and black.   7. The image forming apparatus according to claim 1, wherein a dark color and a light color developer can be used.   When the last toner image is formed on the first and second intermediate transfer media, if the pressurizing unit is pressurizing, yellow, black, magenta, cyan, light magenta, light cyan The image forming apparatus according to claim 1, wherein color application control is performed for each of the intermediate transfer media in order.   When the pressurizing means are separated from each other, the colors are placed in the order of black, cyan, and light cyan on the first intermediate transfer medium, and at the same time, yellow, magenta, and light magenta are printed on the second intermediate transfer medium. After the color placement control is performed in order, the pressure is applied by a pressurizing unit, and a toner image of black + cyan + light color cyan + light color magenta + yellow + magenta is transferred onto the first intermediate transfer medium. The image forming apparatus according to claim 1, wherein the image is transferred in a superimposed manner.   The image forming apparatus according to claim 1, wherein a developer that expresses black, cyan, and light cyan is contained in the developer of the first moving body.   11. The image forming apparatus according to claim 1, wherein a developer that expresses yellow, magenta, and light magenta is contained in the developing device of the second moving body.

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