Image forming system

Abstract

To obtain an image forming system capable of suppressing an increase in cost as compared with a case where a distance sensor for measuring a distance between a holding body and a counter member is attached to the counter member.SOLUTION: An image forming system 10 includes a rotating photoreceptor drum 32, an exposure device 40 disposed opposite to the photoreceptor drum 32, and temperature sensors 82A, 82B, 82C, and 82D. The exposure device 40 is connected to the photoconductor drum 32 via an adjusting device 80 that adjusts the distance between the exposure device 40 and the photoconductor drum 32. The temperature sensors 82A, 82B, 82C, and 82D are provided in the exposure device 40, and any two or more of the exposure device 40, the adjusting device 80, and components interposed between the exposure device 40 and the photoconductor drum 32 other than the adjusting device 80.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to imaging systems. [Background technology]

[0002] Patent Document 1 below discloses an image recording device that records an image on a recording medium by irradiating the recording medium with light, the image recording device comprising a holding unit, an optical unit, a movement mechanism, a temperature detection unit, and a control unit. The holding unit holds the recording medium. The optical unit irradiates the recording medium held in the holding unit with light, and the focal position of the emitted light is variable. The movement mechanism moves the optical unit relative to the holding unit, thereby moving the irradiation position on the recording medium irradiated with light from the optical unit in the scanning direction. The temperature detection unit detects the temperature of the optical unit or its surroundings. The control unit obtains the amount of shift of the focal position due to thermal expansion of the optical unit based on the temperature detected by the temperature detection unit, and corrects the focal position.

[0003] Patent Document 2 below discloses an image forming apparatus including a photosensitive member, an LED head, a displacement sensor, a filter, a driving mechanism, and a position control mechanism. The photosensitive member is drum-shaped with a photosensitive portion on its circumferential surface. The LED head is modulated according to an image signal and has multiple LEDs arranged along the rotation axis of the photosensitive member. The LEDs expose the photosensitive portion of the rotating photosensitive member. The displacement sensor detects the displacement of the circumferential surface of the photosensitive member. The filter extracts frequency components from the detection signal of the displacement sensor, including the rotation frequency component of the photosensitive member and up to approximately 10 times the rotation frequency component, and uses the extracted frequency components as displacement information of the circumferential surface of the photosensitive member. The driving mechanism moves the LED head forward and backward relative to the circumferential surface of the photosensitive member. The position control mechanism drives the driving mechanism according to the displacement information acquired by the filter, thereby controlling the distance between the LED head and the circumferential surface of the photosensitive member to be constant.

[0004] Patent Document 3 listed below discloses an image forming apparatus in which a sheet-shaped recording medium is wound around the outer surface of a drum, and while the drum is rotating, a recording head positioned opposite the drum emits light to expose the recording medium on the drum. The image forming apparatus includes an autofocus mechanism and an error determination means. The autofocus mechanism uses a distance measurement function to measure the distance of the recording head to the drum and maintain an appropriate focal position during exposure. Furthermore, the distance between the recording surface of the recording medium wound around the drum and the recording head is measured using the distance measurement function of the autofocus mechanism before exposure, and if the measured distance is not within a specified range, the error determination means determines that an error has occurred. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-74837 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-187929 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-250105 Summary of the Invention [Problem to be solved by the invention]

[0006] The present disclosure provides an image forming system that can suppress increases in costs compared to when a distance sensor that measures the distance between an image carrier and an opposing member is attached to the opposing member. [Means for solving the problem]

[0007] The image forming system according to the first aspect includes a rotating image carrier, an opposing member arranged opposite the image carrier and connected to the image carrier via an adjustment unit that adjusts the distance between the opposing member and the image carrier, and a temperature detection unit provided on any two or more of the opposing member, the adjustment unit, and components other than the adjustment unit that are interposed between the opposing member and the image carrier.

[0008] An image forming system according to a second aspect is the image forming system according to the first aspect, further comprising a processor, wherein the processor adjusts the amount of fluctuation in the distance between the image carrier and the opposing member using the adjustment unit based on the temperature detected by the temperature detection unit.

[0009] An image forming system according to a third aspect is the image forming system according to the first aspect, wherein the opposing member is an exposure unit having a lens group extending in the axial direction of the image carrier and including a plurality of lenses through which light that exposes the image carrier passes, and a substrate on which a plurality of light-emitting elements that emit the light are mounted.

[0010] An image forming system according to a fourth aspect is the image forming system according to the third aspect, wherein the adjustment unit adjusts fluctuations in the focal position of the image carrier caused by the exposure unit.

[0011] An image forming system according to a fifth aspect is the image forming system according to the first aspect, wherein the opposing member is a developing unit that develops an electrostatic latent image formed on the image carrier by adhering toner thereto.

[0012] An image forming system according to a sixth aspect is the image forming system according to the second aspect, wherein the components other than the adjustment unit interposed between the opposing member and the image carrier include a holding unit that holds the axial end of the image carrier, and the temperature detection unit is provided on the holding unit.

[0013] An image forming system according to a seventh aspect is the image forming system according to the second aspect, wherein the components interposed between the opposing member and the image carrier other than the adjustment unit include a support unit that supports the adjustment unit, and the temperature detection unit is provided on the support unit.

[0014] An image forming system according to an eighth aspect is the image forming system according to the first aspect, wherein the temperature detection unit is a thermocouple.

[0015] An image forming system according to a ninth aspect is the image forming system according to the first aspect, wherein the adjustment unit and the temperature detection unit are provided at both ends in the axial direction of the opposing member and the image carrier, respectively.

[0016] An image forming system according to a tenth aspect is the image forming system according to the ninth aspect, wherein the temperature detecting units are provided on the same component at both ends of the opposing member and the image carrier in the axial direction.

[0017] An image forming system according to an eleventh aspect is the image forming system according to the ninth aspect, wherein the adjustment unit is configured to independently adjust the distance between the image carrier and the opposing member at both axial ends of the opposing member and the image carrier. [Effects of the Invention]

[0018] According to the image forming system of the first aspect, it is possible to suppress an increase in costs compared to a case where a distance sensor that measures the distance between the image carrier and the opposing member is attached to the opposing member.

[0019] According to the image forming system of the second aspect, cost increases can be suppressed compared to when the amount of fluctuation in the distance between the image carrier and the opposing member is adjusted by an adjustment unit based on the distance between the image carrier and the opposing member measured by a distance sensor.

[0020] According to the image forming system of the third aspect, it is possible to suppress an increase in costs compared to a case where a distance sensor that measures the distance between the image carrier and the exposure unit is attached to the exposure unit.

[0021] According to the image forming system of the fourth aspect, it is possible to adjust the fluctuation of the focal position of the image carrier caused by the exposure unit based on the temperature detected by the temperature detection unit.

[0022] According to the image forming system of the fifth aspect, it is possible to suppress an increase in costs compared to a case where a distance sensor that measures the distance between the image carrier and the developing unit is attached to the developing unit.

[0023] According to the image forming system of the sixth aspect, by detecting the temperature of the holding unit, it is possible to detect a distance deviation component caused by deformation such as thermal expansion of the holding unit.

[0024] According to the image forming system of the seventh aspect, by detecting the temperature of the support part, it is possible to detect the distance deviation component caused by deformation such as thermal expansion of the support part.

[0025] According to the image forming system of the eighth aspect, it is possible to reduce the size of the attachment portion of the thermocouple compared to the case where a distance sensor that measures the distance between the image carrier and the opposing member is provided.

[0026] According to the image forming system of the ninth aspect, the amount of fluctuation in the distance between the image carrier and the opposing member can be adjusted more accurately than when an adjustment unit and a temperature detection unit are provided on only one of the axial sides of the opposing member and the image carrier.

[0027] According to the image forming system of the tenth aspect, the temperatures at both ends in the axial direction of the opposing member and the image carrier can be detected more accurately than when the temperature detection units are provided on different components at the two ends.

[0028] According to the image forming system of the eleventh aspect, the distance between the image carrier and the opposing member can be adjusted more accurately than when adjustment is performed using one adjustment unit. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a schematic diagram showing the configuration of an image forming system according to a first embodiment, as viewed from the front side. [Figure 2] FIG. 2 is a schematic diagram illustrating the configuration of a toner image forming unit of the image forming system according to the first embodiment. [Figure 3] 3 is a diagram showing an example of a plurality of temperature sensors provided on one end side in the axial direction of a photosensitive drum in the image forming system according to the first embodiment. FIG. [Figure 4] 3 is a side view showing the configuration of an adjustment device that adjusts the distance between an exposure device and a photosensitive drum in the image forming system according to the first embodiment. FIG. [Figure 5] FIG. 2 is a perspective view showing an example of a temperature sensor. [Figure 6] 1 is a block diagram showing a hardware configuration of an image forming system according to a first embodiment. [Figure 7] FIG. 10 is a configuration diagram showing an example of a temperature sensor provided near an adjustment device that adjusts the distance between an exposure device and a photosensitive drum in an image forming system according to a second embodiment. [Figure 8] FIG. 10 is a schematic diagram illustrating a distance sensor and an adjustment device that measure the distance between an exposure device and a photosensitive drum in an image forming system of a comparative example. [Figure 9] FIG. 10 is a diagram comparing the sizes of a distance sensor and a temperature sensor. DETAILED DESCRIPTION OF THE INVENTION

[0030] An example of an embodiment of the present disclosure will be described below with reference to the drawings. In the following description, the direction indicated by arrow W in the drawings will be referred to as the device width direction, and the direction indicated by arrow H will be referred to as the device height direction. Furthermore, the direction perpendicular to each of the device width direction and device height direction (the direction of arrow D) will be referred to as the device depth direction.

[0031] [First embodiment] Fig. 1 shows an image forming system 10 according to the first embodiment. First, the overall configuration of the image forming system 10 (see Fig. 1) according to the first embodiment will be described. Next, the main parts of the image forming system 10 will be described.

[0032] <Overall Configuration of Image Forming System 10> As shown in FIG. 1, image forming system 10 is an example of an image forming system that forms an image on recording medium P. Specifically, image forming system 10 is an electrophotographic image forming system that forms a toner image on recording medium P. More specifically, image forming system 10 includes an image forming unit 14 and a fixing device 16. Image forming unit 14 has the function of forming toner images of different colors on recording medium P. More specifically, image forming unit 14 includes a toner image forming unit 22 and a transfer device 17. Furthermore, image forming system 10 includes a control device 110 that controls each unit.

[0033] <Toner image forming unit 22> As shown in Fig. 1, a plurality of toner image forming units 22 are provided to form toner images for each color. In the first embodiment, toner image forming units 22 for a total of four colors, yellow (Y), magenta (M), cyan (C), and black (K), are provided. (Y), (M), (C), and (K) shown in Fig. 1 indicate components corresponding to the above colors.

[0034] Since the toner image forming units 22 for each color are configured in the same manner except for the toner used, the respective parts of the toner image forming unit 22(K) are denoted by reference numerals in FIG. 1 as a representative of the toner image forming units 22 for each color.

[0035] Each toner image forming unit 22 for each color has a photosensitive drum 32 that rotates in one direction (for example, the counterclockwise direction, as indicated by arrow A in FIG. 1). The photosensitive drum 32 is an example of an image carrier. Each toner image forming unit 22 for each color also has a charger 23, an exposure device 40, a developing device 38, and a cleaning device 42. The exposure device 40 is an example of an opposing member and an example of an exposure unit.

[0036] 2 shows the toner image forming unit 22. The toner image forming unit 22 has the same configuration except for the color of the toner, so the reference symbols Y, M, C, and K for the respective colors are omitted in FIG.

[0037] 2, the charger 23 is a charging roller that rotates while in contact with the photosensitive drum 32. The configuration of the charger 23 can be changed.

[0038] The exposure device 40 is disposed downstream of the charger 23 in the rotation direction of the photosensitive drum 32, facing the photosensitive drum 32. The exposure device 40 is disposed at an interval from the photosensitive drum 32.

[0039] The exposure device 40 includes a rectangular housing 50. The exposure device 40 includes, on a surface 50A of the housing 50 facing the photosensitive drum 32, a lens group 54 including a plurality of lenses arranged in the axial direction of the photosensitive drum 32, and a substrate 52 on which a plurality of light-emitting elements that emit light are mounted (see FIG. 4). The exposure device 40 exposes the photosensitive drum 32 by transmitting light emitted from the plurality of light-emitting elements through the plurality of lenses. This forms an electrostatic latent image on the surface of the photosensitive drum 32. As an example, the exposure device 40 is configured as an LED print head including LEDs, which are an example of light-emitting elements.

[0040] The developing device 38 is disposed facing the photosensitive drum 32, downstream of the exposure device 40 in the rotation direction of the photosensitive drum 32. The developing device 38 includes a housing 60, a developing roll 62, and multiple (for example, two) augers 64, 65. The housing 60 contains a developer containing toner. The developing roll 62 holds the developer and transports it to the photosensitive drum 32. The augers 64, 65 transport the developer in the opposite axial direction while stirring it. The developer stirred by the auger 65 is supplied to the developing roll 62.

[0041] The cleaning device 42 is disposed downstream of the primary transfer position T1 (see FIG. 1) in the rotation direction of the photosensitive drum 32 and upstream of the charger 23. As an example, the cleaning device 42 includes a cleaning blade 72 and a cleaning roll 74 inside a housing 70. The cleaning blade 72 and the cleaning roll 74 come into contact with the surface of the photosensitive drum 32 to remove toner and the like remaining on the surface of the photosensitive drum 32.

[0042] 1, in the toner image forming unit 22 for each color, the charger 23 charges the surface of the photosensitive drum 32. Furthermore, the exposure device 40 exposes the photosensitive drum 32 charged by the charger 23 to light, thereby forming an electrostatic latent image on the surface of the photosensitive drum 32. Furthermore, the developing device 38 develops the electrostatic latent image formed on the surface of the photosensitive drum 32 with toner to form a toner image. The cleaning device 42 removes toner remaining on the surface of the photosensitive drum 32 after the toner image has been transferred.

[0043] <Transfer device 17> 1, transfer device 17 is a device that transfers the toner image formed in toner image forming unit 22 onto recording medium P. Specifically, transfer device 17 performs primary transfer of the toner image of each color on photosensitive drum 32 onto transfer belt 24 as an intermediate transfer body, and then performs secondary transfer of the superposed toner image onto recording medium P. Specifically, transfer device 17 includes transfer belt 24, primary transfer roll 26, and secondary transfer roll 28, as shown in FIG.

[0044] The primary transfer roll 26 is a roll that transfers the toner image of each color on the photosensitive drum 32 to the transfer belt 24 at a primary transfer position T1 between the photosensitive drum 32 and the primary transfer roll 26. In the first embodiment, a primary transfer electric field is applied between the primary transfer roll 26 and the photosensitive drum 32, so that the toner image formed on the photosensitive drum 32 is transferred to the transfer belt 24 at the primary transfer position T1.

[0045] The toner image is transferred from the photosensitive drum 32 of each color onto the outer peripheral surface of the transfer belt 24. Specifically, the transfer belt 24 is configured as follows: As shown in Fig. 1, the transfer belt 24 is annular and is wound around multiple rolls 39 to determine its position.

[0046] The transfer belt 24 rotates in the direction of arrow B, for example, when a drive roll 39D among the plurality of rolls 39 is rotationally driven by a drive unit (not shown). Of the plurality of rolls 39, a roll 39B shown in FIG. 1 is an opposing roll 39B that faces the secondary transfer roll 28.

[0047] The secondary transfer roll 28 is a roll that transfers the toner image transferred to the transfer belt 24 to the recording medium P at a secondary transfer position T2 between the opposing roll 39B and the secondary transfer roll 28. In the first embodiment, a secondary transfer electric field is applied between the opposing roll 39B and the secondary transfer roll 28, so that the toner image transferred to the transfer belt 24 is transferred to the recording medium P at the secondary transfer position T2.

[0048] <Fixing device 16> 1, the fixing device 16 is a device that fixes the toner image transferred to the recording medium P by the secondary transfer roll 28 to the recording medium P. Specifically, as shown in FIG. 1, the fixing device 16 has a heating roll 16A as a heating member and a pressure roll 16B as a pressure member. In the fixing device 16, the toner image formed on the recording medium P is fixed to the recording medium P by heating and pressurizing the recording medium P with the heating roll 16A and the pressure roll 16B.

[0049] <Operation of Image Forming System 10> Next, the operation of the image forming system 10 will be described.

[0050] When the operation of the image forming system 10 is started, in the toner image forming units 22 for each color, the photosensitive drums 32 are charged by the chargers 23, and the photosensitive drums 32 are exposed by the exposure devices 40, thereby forming electrostatic latent images on the surfaces of the photosensitive drums 32. Furthermore, the electrostatic latent images on the photosensitive drums 32 are developed into toner images by the developing devices 38. As a result, toner images of each color are formed on the surfaces of the photosensitive drums 32 in the toner image forming units 22 for each color.

[0051] Next, a voltage (primary transfer voltage) is applied from a power source (not shown) to the primary transfer rolls 26 of each color. In addition, the drive roll 39D rotates the transfer belt 24 in the direction of the arrow. As a result, the toner images of each color are primarily transferred onto the transfer belt 24 in a superimposed manner.

[0052] Furthermore, the recording medium P is transported to secondary transfer position T2 in time with the timing at which the toner images of each color held on the rotating transfer belt 24 reach between the opposing roll 39B and the secondary transfer roll 28. At secondary transfer position T2, a voltage (secondary transfer voltage) is applied to the opposing roll 39B from a power source (not shown), thereby secondarily transferring the toner images of each color onto the recording medium P. Furthermore, the recording medium P is transported to fixing device 16. The toner images of each color are then fixed to the recording medium P by fixing device 16, and an image is formed on the recording medium P.

[0053] <Specific Configuration in the Vicinity of Exposure Device 40> Next, a specific configuration of the exposure device 40 and its vicinity in the toner image forming unit 22, which is a main part of the image forming system 10, will be described.

[0054] 3, the image forming system 10 includes an adjustment device 80 that adjusts the distance between the exposure device 40 of the toner image forming unit 22 and the photosensitive drum 32. The image forming system 10 also includes a plurality of temperature sensors 82 (e.g., temperature sensors 82A, 82B, 82C, and 82D). The exposure device 40 is connected to the photosensitive drum 32 via the adjustment device 80 that adjusts the distance between the exposure device 40 and the photosensitive drum 32.

[0055] (adjustment device 80) 4 shows a side view of the configuration of the adjustment device 80. The adjustment device 80 is an example of an adjustment section. The adjustment device 80 has the following configuration. As shown in FIG. 4, support sections 202 are formed to extend from both ends of the exposure device 40. The support sections 202 are provided with contact pins 203 and support pins 204 that protrude in a vertical direction (arrow H1 direction) perpendicular to the longitudinal direction of the exposure device 40 (arrow D1 direction).

[0056] The upper end of contact pin 203 protruding upward from support portion 202 comes into contact from below with inclined surface 205A of movable body 205, which is slidably fitted onto part of support shaft 201. The lower end of support pin 204 protruding downward from support portion 202 is inserted into U-shaped elongated hole 220A formed in frame 220. Exposure device 40 is engaged with one end of spring 206, the other end of which is engaged with frame 220, and is urged upward by the elastic force of spring 206.

[0057] A support shaft 201 is positioned above the exposure device 40, spanning a pair of side frames 221 and 222. A spring 207 is attached to both ends of the support shaft 201. One end of the spring 207 contacts a flange portion 201A protruding from the circumferential surface of the support shaft 201, and the other end of the spring 207 contacts the inner surface of a movable body 205 attached to the outside of the support shaft 201. As a result, the movable body 205 is urged in the direction of the end of the support shaft 201 by the elastic force of the spring 207.

[0058] The pair of side frames 221 and 222 have threaded holes 221A and 222A formed therein, into which the adjustment screws 208A and 208B engage. The tips of the adjustment screws 208A and 208B are screwed into the threaded holes 221A and 222A from the outside of the side frames 221 and 222, and come into contact with the side surfaces of the movable body 205. The end of the adjustment screw 208A on the outside of the side frame 221 is fixed to the rotation shaft of one adjustment motor 212A fixed to the outside of the side frame 221. The end of the adjustment screw 208B on the outside of the side frame 222 is fixed to the rotation shaft of the other adjustment motor 212B fixed to the outside of the side frame 222. Therefore, by driving the adjustment motors 212A and 212B, the adjustment screws 208A and 208B rotate. By rotating the adjustment screws 208A and 208B, the moving body 205 is displaced in the direction of the arrow D1, which is the axial direction of the support shaft 201, by the elastic force of the spring 207 or against this elastic force.

[0059] When the movable body 205 is displaced in the direction of arrow D1, the contact position of the upper end of the contact pin 203 on the inclined surface 205A of the movable body 205 changes in the directions of arrow D1 and arrow H1. As the contact position of the upper end of the contact pin 203 on the inclined surface 205A of the movable body 205 changes in the direction of arrow H1, the exposure device 40, which is biased upward by the spring 206, is displaced in the direction of arrow H1 by the elastic force of the spring 206 or against this elastic force.

[0060] In this way, the rotation of adjustment screws 208A, 208B driven by adjustment motors 212A and 212B causes exposure device 40 to move in the direction of arrow H1, thereby adjusting the distance between exposure device 40 and photosensitive drum 32. Adjustment device 80 has the same configuration at both ends of exposure device 40 in the longitudinal direction (direction D). Therefore, the distance between exposure device 40 and photosensitive drum 32 can be adjusted individually at both ends of exposure device 40 in the longitudinal direction. Adjustment device 80 adjusts the distance between exposure device 40 and photosensitive drum 32, thereby adjusting fluctuations in the focal position of photosensitive drum 32 caused by exposure device 40.

[0061] (multiple temperature sensors 82) As shown in FIG. 3, for example, temperature sensors 82A, 82B, 82C, and 82D are provided on one axial end side of the photosensitive drum 32 (on the axial right side of the photosensitive drum 32 shown in FIG. 3). The temperature sensors 82A, 82B, 82C, and 82D are an example of a temperature detection unit. The temperature sensors 82A, 82B, 82C, and 82D are provided on any two or more (four in the first embodiment) of the exposure device 40, the adjustment device 80, and components other than the adjustment device 80 that are interposed between the exposure device 40 and the photosensitive drum 32. Note that in the first embodiment, when it is not necessary to distinguish between the temperature sensors 82A, 82B, 82C, and 82D, the reference characters A to D may be omitted and they may be referred to as temperature sensor 82.

[0062] As an example, the temperature sensor 82A is provided on the longitudinal end side of the exposure device 40. The temperature sensor 82A detects the temperature of the exposure device 40. As an example, the temperature sensor 82A is provided inside or outside the housing 50 of the exposure device 40.

[0063] The temperature sensor 82B is provided in a component of the adjustment device 80. The temperature sensor 82B detects the temperature of the adjustment device 80. The temperature sensor 82B may be provided in any part of the component of the adjustment device 80, but is preferably provided in a part relatively close to the photosensitive drum 32.

[0064] The temperature sensor 82C is provided on a holder 90 that holds the shaft portion 32A at the axial end of the photosensitive drum 32. The holder 90 rotatably holds the photosensitive drum 32. The temperature sensor 82C detects the temperature of the holder 90. The holder 90 is an example of a part that is interposed between the exposure device 40 other than the adjustment device 80 and the photosensitive drum 32. The holder 90 is also an example of a holding portion.

[0065] The temperature sensor 82D is provided on a frame 92 that supports the adjustment device 80. In the first embodiment, the frame 92 also supports the holder 90. The temperature sensor 82D detects the temperature of the frame 92. The frame 92 is an example of a part that is interposed between the exposure device 40 and the photosensitive drum 32, other than the adjustment device 80. The frame 92 is also an example of a support portion.

[0066] Although not shown, temperature sensors 82A, 82B, 82C, and 82D are similarly provided on the other axial end side (the axial left side of the photosensitive drum 32) of the photosensitive drum 32. The temperature sensors 82A, 82B, 82C, and 82D are provided on the same components (i.e., the exposure device 40, the adjustment device 80, the holder 90, and the frame 92) as on one axial end side of the photosensitive drum 32. As an example, the temperature sensors 82A, 82B, 82C, and 82D are provided at similar positions on the components on one axial end side of the photosensitive drum 32.

[0067] As shown in Fig. 5, a thermocouple is used as the temperature sensor 82. The dimensions of the temperature sensor 82 are smaller than those of a general distance sensor that measures the distance between the photosensitive drum and the exposure device (see Fig. 9). The dimensions of the temperature sensor 82 are such that the maximum length in the direction of arrow L1 is 11 mm, the maximum width in the direction of arrow W1 is 7 mm, and the maximum thickness in the direction of arrow t1 is 3 mm.

[0068] <Control device 110> Next, the control device 110 of the image forming system 10 will be described.

[0069] Fig. 6 is a block diagram showing the hardware configuration of the image forming system 10. As shown in Fig. 6, the control device 110 has components including a CPU (Central Processing Unit) 111, a ROM (Read Only Memory) 112, a RAM (Random Access Memory) 113, a storage 114, an operation control unit 115, a display control unit 116, and an input / output interface 117. Each component is connected to each other via a bus 119 so as to be able to communicate with each other. In addition to the above components, the control device 110 may also have a communication interface for communicating information with an external device.

[0070] The CPU 111 is a central processing unit that executes various programs and controls each part. The CPU 111 is an example of a processor. The CPU 111 reads a program from the ROM 112 or the storage 114, and executes the program using the RAM 113 as a work area. In this embodiment, the processing program is stored in the ROM 112 or the storage 114. The CPU 111 controls each of the above components and performs various arithmetic processing according to the processing program recorded in the ROM 112 or the storage 114.

[0071] The ROM 112 stores various programs and various data. The RAM 113 temporarily stores programs or data as a working area. The storage 114 is configured with an HDD (Hard Disk Drive) or an SSD (Solid State Drive) and stores various programs including an operating system and various data.

[0072] The operation control unit 115 controls input operations of an operation unit (not shown). For example, operation instructions for the image forming system 10 are input from the operation unit. Based on the operation instructions from the operation unit, the CPU 111 operates each unit of the image forming system 10.

[0073] The display control unit 116 controls the screen displayed on the display unit (not shown). The operation unit and the display unit may be configured as an integrated liquid crystal display.

[0074] The input / output interface 117 is an interface for transmitting and receiving information to and from peripheral devices of the control device 110. As an example, the input / output interface 117 is connected to each of the temperature sensors 82A, 82B, 82C, and 82D and the adjustment device 80. Alternatively, the temperature sensors 82A, 82B, 82C, and 82D may be directly connected to the adjustment device 80 via the bus 119. The temperatures detected by the temperature sensors 82A, 82B, 82C, and 82D are input to the CPU 111 via the input / output interface 117. The CPU 111 controls the adjustment motors 212A and 212B by outputting signals to the adjustment device 80 via the input / output interface 117.

[0075] CPU 111 predicts the amount of variation in the distance between photosensitive drum 32 and exposure device 40 (in the first embodiment, the variation in the focal position of photosensitive drum 32 caused by exposure device 40) based on the temperatures detected by temperature sensors 82A, 82B, 82C, and 82D. Then, CPU 111 adjusts the amount of variation in the distance between photosensitive drum 32 and exposure device 40 (in the first embodiment, the variation in the focal position of photosensitive drum 32 caused by exposure device 40) using adjustment device 80. Here, adjusting the variation in the focal position means adjusting the distance between photosensitive drum 32 and exposure device 40 in a direction that reduces the deviation from the focus.

[0076] In the first embodiment, temperature sensors 82A, 82B, 82C, and 82D are provided at both axial ends of the exposure device 40 and the photosensitive drum 32, respectively. The adjustment device 80 is also provided with adjustment motors 212B and 212B at one and the other axial ends of the exposure device 40 and the photosensitive drum 32 (see FIG. 4). At both axial ends of the exposure device 40 and the photosensitive drum 32, the adjustment device 80 independently adjusts the distance between the photosensitive drum 32 and the exposure device 40 using the adjustment motors 212B and 212B. Here, "independently" means that the distance between the photosensitive drum 32 and the exposure device 40 is independently adjusted at both axial ends of the photosensitive drum 32.

[0077] 3, temperature sensor 82A detects the temperature of exposure device 40 located at one axial end of photosensitive drum 32. Temperature sensor 82B detects the temperature of adjustment device 80 located at one axial end of photosensitive drum 32. Temperature sensor 82C detects the temperature of holder 90 located at one axial end of photosensitive drum 32. Temperature sensor 82D detects the temperature of frame 92 located at one axial end of photosensitive drum 32. CPU 111 calculates the amount of temperature change of holder 90, frame 92, exposure device 40, and adjustment device 80 relative to a predetermined reference temperature.

[0078] As an example, the adjustment amount of the distance between the photosensitive drum 32 and the exposure device 40 is calculated by the following method. Here, ad is the thermal expansion coefficient [mm / °C] of the holder 90, and Td is the temperature change [°C] of the holder 90. In this case, the distance change Ld [mm] due to the temperature change of the holder 90 is calculated by the following formula. Ld=Td×ad

[0079] Furthermore, af is the thermal expansion coefficient [mm / °C] of the frame 92, and Tf is the temperature change [°C] of the frame 92. In this case, the distance change Lf [mm] due to the temperature change of the frame 92 is calculated by the following formula. Lf=Tf×af

[0080] Although not described here, the amount of change in distance due to temperature change in the exposure device 40 and the amount of change in distance due to temperature change in the adjustment device 80 are also calculated in a similar manner.

[0081] At this time, the adjustment amount L of the distance between the photosensitive drum 32 and the exposure device 40 is calculated by the following formula. L=Lf+Ld+...

[0082] The CPU 111 adjusts the distance between the photosensitive drum 32 at one end of the axial direction of the photosensitive drum 32 and the exposure device 40 by driving the adjustment device 80 according to the adjustment amount L of the distance between the photosensitive drum 32 and the exposure device 40.

[0083] Furthermore, CPU 111 uses a similar method to calculate adjustment amount L for the distance between photosensitive drum 32 and exposure device 40 based on the temperatures detected by temperature sensors 82A, 82B, 82C, and 82D on the other axial end side of photosensitive drum 32. CPU 111 adjusts the distance between photosensitive drum 32 on the other axial end side of photosensitive drum 32 and exposure device 40 by driving adjustment device 80 in accordance with adjustment amount L for the distance between photosensitive drum 32 and exposure device 40.

[0084] <Image forming system of comparative example> Here, an image forming system as a comparative example will be described.

[0085] FIG. 8 shows a portion of a toner image forming unit 502 of an image forming system 500 of a comparative example. As shown in FIG. 8, the image forming system 500 includes a photosensitive drum 32, an exposure device 40, an adjustment device 504, and a frame 506. The adjustment device 504 adjusts the distance between the photosensitive drum 32 and the exposure device 40. The frame 506 supports the adjustment device 504. The image forming system 500 also includes distance sensors 510 at both longitudinal ends of the exposure device 50. The distance sensors 510 measure the distance between the photosensitive drum 32 and the exposure device 40. The distance sensors 510 are fixed to the surface of the housing 50 of the exposure device 40 on the photosensitive drum 32 side by, for example, mounting portions 511.

[0086] In the image forming system 500 , the distance between the photosensitive drum 32 and the exposure device 40 is adjusted by the adjustment device 504 based on the amount of change in the distance between the photosensitive drum 32 and the exposure device 40 measured by the distance sensor 510 .

[0087] As an example, the distance sensor 510 is a magnetic displacement sensor. As shown in FIG. 9, the dimensions of the distance sensor 510 are larger than the dimensions of the temperature sensor 82 used in the image forming system 10 of the first embodiment. For example, the dimensions of the distance sensor 510 are such that the maximum length in the direction of arrow L2 is 94 mm, the maximum width in the direction of arrow W2 is 17 mm, and the maximum thickness in the direction of arrow t2 is 27 mm. The price of the distance sensor 510 is also higher than the price of the temperature sensor 82. That is, in the image forming system 500, the distance sensor 510 is expensive, which increases costs. In addition, in the image forming system 500, the distance sensor 510 is large, which increases the device size.

[0088] <Operation of the First Embodiment> Next, the operation of the image forming system 10 of the first embodiment will be described.

[0089] The image forming system 10 includes an exposure device 40 disposed opposite the photosensitive drum 32, and temperature sensors 82A, 82B, 82C, and 82D. The exposure device 40 is connected to the photosensitive drum 32 via an adjustment device 80 that adjusts the distance between the exposure device 40 and the photosensitive drum 32. The temperature sensors 82A, 82B, 82C, and 82D are provided on two or more of the exposure device 40, the adjustment device 80, and components other than the adjustment device 80 that are interposed between the exposure device 40 and the photosensitive drum 32. In the first embodiment, the temperature sensor 82A is provided on a longitudinal end side of the exposure device 40. The temperature sensor 82B is provided on a component of the adjustment device 80. The temperature sensor 82C is provided on a holder 90 that holds the shaft portion 32A at the axial end of the photosensitive drum 32. The temperature sensor 82D is provided on a frame 92 that supports the adjustment device 80.

[0090] The temperature sensors 82A, 82B, 82C, and 82D are cheaper than general distance sensors (for example, distance sensor 510 shown in FIG. 9). Therefore, in the image forming system 10, it is possible to suppress an increase in costs compared to when a distance sensor that measures the distance between the photosensitive drum and the exposure device is attached to the exposure device.

[0091] Furthermore, in the image forming system 10, the CPU 111 adjusts the amount of variation in the distance between the photosensitive drum 32 and the exposure device 40 using the adjustment device 80 based on the temperatures detected by the temperature sensors 82A, 82B, 82C, and 82D. Therefore, in the image forming system 10, it is possible to suppress an increase in costs compared to when the amount of variation in the distance between the photosensitive drum and the exposure device is adjusted using an adjustment device based on the distance between the photosensitive drum and the exposure device measured by a distance sensor.

[0092] In the image forming system 10, the opposing member facing the photosensitive drum 32 is the exposure device 40. The exposure device 40 includes a lens group 54 and a substrate 52. The lens group 54 extends in the axial direction of the photosensitive drum 32 and includes multiple lenses through which light that exposes the photosensitive drum 32 passes. The substrate 52 is equipped with multiple light-emitting elements that emit light. The exposure device 40 exposes the photosensitive drum 32 by transmitting light emitted from the multiple light-emitting elements through the multiple lenses. This forms an electrostatic latent image on the photosensitive drum 32. In the exposure device 40, the distance between the photosensitive drum 32 and the exposure device 40 may fluctuate due to thermal expansion of components and bending deformation such as the bimetal effect. In the first embodiment, the adjustment device 80 adjusts the amount of fluctuation in the distance between the photosensitive drum 32 and the exposure device 40 based on temperatures detected by temperature sensors 82A, 82B, 82C, and 82D. Therefore, in the image forming system 10, it is possible to suppress an increase in costs compared to when a distance sensor that measures the distance between the photosensitive drum and the exposure device is attached to the exposure device.

[0093] Furthermore, in the image forming system 10, the adjustment device 80 adjusts fluctuations in the focal position of the photosensitive drum 32 caused by the exposure device 40. Therefore, in the image forming system 10, fluctuations in the focal position of the photosensitive drum 32 caused by the exposure device 40 can be adjusted based on the temperatures detected by the temperature sensors 82A, 82B, 82C, and 82D. This makes it possible to suppress fluctuations in the focal position of the photosensitive drum 32 caused by thermal expansion of parts near the exposure device 40, etc.

[0094] Furthermore, in the image forming system 10, a temperature sensor 82C is provided on a holder 90 that holds the axial end of the photosensitive drum 32 as a component other than the adjustment device 80 that is interposed between the exposure device 40 and the photosensitive drum 32. Therefore, in the image forming system 10, by detecting the temperature of the holder 90, it is possible to detect distance deviation components due to deformation such as thermal expansion of the holder 90.

[0095] Furthermore, in the image forming system 10, a temperature sensor 82D is provided on the frame 92 that supports the adjustment device 80 as a component other than the adjustment device 80 that is interposed between the exposure device 40 and the photosensitive drum 32. Therefore, in the image forming system 10, by detecting the temperature of the frame 92, it is possible to detect distance deviation components due to deformation such as thermal expansion of the frame 92.

[0096] Furthermore, in image forming system 10, temperature sensors 82A, 82B, 82C, and 82D are thermocouples. Temperature sensors 82A, 82B, 82C, and 82D made of thermocouples are smaller than general distance sensors (for example, distance sensor 510 shown in FIG. 9 ). Therefore, in image forming system 10, the size of the attachment portions for temperature sensors 82A, 82B, 82C, and 82D can be reduced compared to when distance sensors that measure the distance between the photosensitive drums and the exposure devices are provided. In other words, by providing temperature sensors 82A, 82B, 82C, and 82D made of thermocouples, it is possible to suppress an increase in the size of the device compared to when distance sensors that measure the distance between the photosensitive drums and the exposure devices are provided.

[0097] Furthermore, in the image forming system 10, the adjustment motor 212A or adjustment motor 212B of the adjustment device 80 and the temperature sensors 82A, 82B, 82C, and 82D are provided at both axial ends of the exposure device 40 and the photosensitive drum 32. Therefore, in the image forming system 10, the amount of fluctuation in the distance between the photosensitive drum 32 and the exposure device 40 can be adjusted more accurately than in a case where an adjustment device and a temperature sensor are provided at only one axial end of the exposure device or the photosensitive drum.

[0098] Furthermore, in the image forming system 10, the temperature sensors 82A, 82B, 82C, and 82D are provided on the same component at both axial ends of the exposure device 40 and the photosensitive drum 32. Therefore, in the image forming system 10, the temperatures at both axial ends can be detected more accurately than in a case where the temperature sensors are provided on different components at both axial ends of the exposure device and the photosensitive drum.

[0099] Furthermore, in the image forming system 10, the adjustment devices 80 are configured to independently adjust the distance between the photosensitive drum 32 and the exposure device 40 at both axial ends of the exposure device 40 and the photosensitive drum 32. Therefore, in the image forming system 10, the distance between the photosensitive drum 32 and the exposure device 40 can be adjusted more accurately than when adjustment is performed using a single adjustment device.

[0100] Second Embodiment Next, an image forming system according to a second embodiment will be described. Note that the same components as those in the first embodiment will be assigned the same reference numerals and the description thereof will be omitted.

[0101] Fig. 7 shows a portion of a toner image forming unit 302 of an image forming system 300 according to the second embodiment. As shown in Fig. 7, the image forming system 300 includes a photosensitive drum 32, a developing device 38 having a developing roll 62, and an adjustment device 304. The developing roll 62 is disposed opposite the photosensitive drum 32. The developing roll 62 is an example of an opposing member and an example of a developing unit. The developing roll 62 develops the electrostatic latent image formed on the photosensitive drum 32 by adhering toner thereto.

[0102] The adjustment device 304 adjusts the distance between the developing roll 62 and the photosensitive drum 32. The adjustment device 304 is an example of an adjustment unit. The developing roll 62 is connected to the photosensitive drum 32 via the adjustment device 304, which adjusts the distance between the developing roll 62 and the photosensitive drum 32. The adjustment device 304 adjusts the distance between the developing roll 62 and the photosensitive drum 32 by moving a frame 312 that rotatably supports the shaft portion 62A of the developing roll 62. Although the configuration of the adjustment device 304 is not shown in the drawings, it may be the same as the configuration of the adjustment device 80, for example.

[0103] The image forming system 300 includes a plurality of temperature sensors 306 (for example, temperature sensors 306A, 306B, 306C, and 306D). The temperature sensors 306 are an example of a temperature detection unit. The temperature sensors 306 are provided in two or more of the developing roll 62, the adjusting device 304, and components other than the adjusting device 304 that are interposed between the developing roll 62 and the photosensitive drum 32.

[0104] As an example, the temperature sensors 306A are provided at both axial ends of the developing roll 62. The temperature sensors 306A detect the temperature of the developing roll 62.

[0105] The temperature sensors 306B are provided on components of the adjustment device 304 at both ends in the axial direction of the photosensitive drum 32. The temperature sensors 306B detect the temperature of the adjustment device 304.

[0106] The temperature sensors 306C are provided on holders 310 that hold the shaft portions 32A at both ends of the photosensitive drum 32 in the axial direction. The temperature sensors 306C detect the temperature of the holders 310. The holders 310 are an example of a component other than the adjustment device 304 that is interposed between the developing roll 62 and the photosensitive drum 32. The holders 310 are also an example of a holding portion.

[0107] The temperature sensor 306D is provided on a frame 314 that supports the adjustment device 304. In the second embodiment, the frame 314 also supports the holder 310. The temperature sensor 306D detects the temperature of the frame 314. The frame 314 is an example of a part other than the adjustment device 304 that is interposed between the developing roll 62 and the photosensitive drum 32. The frame 314 is also an example of a support portion.

[0108] A CPU of a control device (not shown) predicts the amount of fluctuation in the distance between the photosensitive drum 32 and the developing roll 62 based on the temperatures detected by the temperature sensors 306A, 306B, 306C, and 306D. Then, the CPU adjusts the amount of fluctuation in the distance between the photosensitive drum 32 and the developing roll 62 using an adjustment device 304.

[0109] Temperature sensors 306A, 306B, 306C, and 306D are provided on both axial end sides of the photosensitive drum 32. Adjustment devices 304 independently adjust the distance between the photosensitive drum 32 and the developing roll 62 at both axial end sides of the photosensitive drum 32 and the developing roll 62. The other configurations of the image forming system 300 are the same as those of the image forming system 10 of the first embodiment.

[0110] In addition to the effects of the same configuration as the image forming system 10 of the first embodiment, the image forming system 300 of the second embodiment has the following effects.

[0111] In image forming system 300 of the second embodiment, developing roll 62 is provided opposite photosensitive drum 32, which develops the electrostatic latent image formed on photosensitive drum 32 by adhering toner. In image forming system 300, adjustment device 304 adjusts the amount of variation in the distance between photosensitive drum 32 and developing roll 62 based on temperatures detected by temperature sensors 306A, 306B, 306C, and 306D. Therefore, in image forming system 300, it is possible to suppress an increase in costs compared to when a distance sensor that measures the distance between the photosensitive drum and developing roll is attached to the developing roll.

[0112] 〔supplementary explanation〕 The image forming system of the present disclosure is not limited to the image forming systems 10 and 300 described in the first and second embodiments, and various modifications are possible. For example, the configurations of the adjustment device 80 and the adjustment device 304 can be modified. Furthermore, the number of temperature sensors can be changed to any number greater than or equal to two, and the positions at which the temperature sensors are attached can also be changed to any position greater than or equal to two.

[0113] Furthermore, in the image forming system 10 described in the first embodiment, the adjustment devices 80 independently adjusted the distance between the photosensitive drum 32 and the exposure device 40 at both axial ends of the photosensitive drum 32, but the present disclosure is not limited to this configuration. For example, a configuration in which a single adjustment device adjusts the distance between the photosensitive drum 32 and the exposure device 40 may be used. Furthermore, in the image forming system 300 described in the second embodiment, the adjustment devices 304 independently adjusted the distance between the photosensitive drum 32 and the developing roll 62 at both axial ends of the photosensitive drum 32, but the present disclosure is not limited to this configuration. For example, a configuration in which a single adjustment device adjusts the distance between the photosensitive drum 32 and the developing roll 62 may be used.

[0114] In the first and second embodiments, an adjustment device and a temperature sensor are provided at both axial ends of the photosensitive drum 32, but the present disclosure is not limited to this configuration. For example, an adjustment device and a temperature sensor may be provided at one axial end of the photosensitive drum 32.

[0115] In the first and second embodiments, the temperature sensors are provided on the same component at both axial ends of the photosensitive drum 32, but the present disclosure is not limited to this configuration. For example, the temperature sensors may be provided on different components at both axial ends of the photosensitive drum 32.

[0116] The processing of the image forming systems 10 and 300 can also be realized by dedicated hardware circuits. In this case, the processing may be performed by a single piece of hardware or by multiple pieces of hardware.

[0117] The program for operating the image forming systems 10 and 300 may be provided by a computer-readable recording medium such as a USB (Universal Serial Bus) memory, a flexible disk, or a CD-ROM (Compact Disc Read Only Memory), or may be provided online via a network such as the Internet. In this case, the program recorded on the computer-readable recording medium is typically transferred and stored in a memory or storage device. The program may be provided as standalone application software, or may be incorporated into the software of each device of the image forming systems 10 and 300 as a function thereof.

[0118] Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that the present invention is not limited to such embodiments, and that various other embodiments are possible within the scope of the present invention.

[0119] [Note] Preferred aspects of the present disclosure will be described below.

[0120] (((1))) a rotating image carrier; an opposing member disposed opposite the image carrier and connected to the image carrier via an adjustment unit that adjusts the distance between the opposing member and the image carrier; a temperature detection unit provided on any two or more of the opposing member, the adjustment unit, and a component other than the adjustment unit that is interposed between the opposing member and the image carrier; An image forming system having:

[0121] (((2))) a processor; The processor: The image forming system according to (((1))), wherein the adjustment unit adjusts the amount of variation in the distance between the image carrier and the opposing member based on the temperature detected by the temperature detection unit.

[0122] (((3))) The opposing member is a lens group extending in the axial direction of the image carrier and including a plurality of lenses through which light for exposing the image carrier passes; a substrate on which a plurality of light-emitting elements that emit the light are mounted; The image forming system according to (((1))) or (((2))), wherein the exposure section has

[0123] (((4))) The image forming system according to (((3))), wherein the adjustment unit adjusts a variation in the focal position of the image carrier caused by the exposure unit.

[0124] (((5))) The opposing member is The image forming system according to any one of (((1))) to (((4))), wherein the developing unit develops the electrostatic latent image formed on the image carrier by adhering toner.

[0125] (((6))) a component other than the adjustment unit interposed between the opposing member and the image carrier includes a holding unit that holds an end of the image carrier in the axial direction, The image forming system according to (((2))), wherein the temperature detection unit is provided in the holding unit.

[0126] (((7))) a component interposed between the opposing member and the image carrier other than the adjustment unit includes a support unit that supports the adjustment unit, The image forming system according to (((2))), wherein the temperature detection unit is provided on the support unit.

[0127] (((8))) The image forming system according to any one of (((1))) to (((7))), wherein the temperature detection unit is a thermocouple.

[0128] (((9))) The image forming system described in any one of (((1))) to (((8))), wherein the adjustment unit and the temperature detection unit are provided at both axial ends of the opposing member and the image carrier, respectively.

[0129] (((10))) The image forming system according to (((9))), wherein the temperature detecting units are provided on the same component at both ends of the opposing member and the image carrier in the axial direction.

[0130] (((11))) The image forming system described in (((9))) is configured such that the adjustment unit independently adjusts the distance between the image carrier and the opposing member at both axial ends of the opposing member and the image carrier.

[0131] According to the image forming system of (((1))), it is possible to suppress an increase in costs compared to when a distance sensor that measures the distance between the image carrier and the opposing member is attached to the opposing member.

[0132] According to the image forming system of (((2))), it is possible to suppress increases in costs compared to when the amount of fluctuation in the distance between the image carrier and the opposing member is adjusted by an adjustment unit based on the distance between the image carrier and the opposing member measured by a distance sensor.

[0133] According to the image forming system of (((3))), it is possible to suppress an increase in costs compared to a case where a distance sensor that measures the distance between the image carrier and the exposure unit is attached to the exposure unit.

[0134] According to the image forming system of (((4))), it is possible to adjust the fluctuation of the focal position of the image carrier caused by the exposure unit based on the temperature detected by the temperature detection unit.

[0135] According to the image forming system of (((5))), it is possible to suppress an increase in costs compared to when a distance sensor that measures the distance between the image carrier and the developing unit is attached to the developing unit.

[0136] According to the image forming system of (((6))), by detecting the temperature of the holding unit, it is possible to detect the distance deviation component caused by deformation such as thermal expansion of the holding unit.

[0137] According to the image forming system of (((7))), by detecting the temperature of the support part, it is possible to detect the distance deviation component caused by deformation such as thermal expansion of the support part.

[0138] According to the image forming system of (((8))), the size of the thermocouple attachment portion can be reduced compared to when a distance sensor that measures the distance between the image carrier and the opposing member is provided.

[0139] According to the image forming system of (((9))), the amount of fluctuation in the distance between the image carrier and the opposing member can be adjusted more accurately than when an adjustment unit and a temperature detection unit are provided on only one of the axial directions of the opposing member and the image carrier.

[0140] According to the image forming system of (((10))), the temperatures at both ends in the axial direction of the opposing member and the image carrier can be detected more accurately than when the temperature detection units are provided on different components at both ends.

[0141] According to the image forming system of (((11))), the distance between the image carrier and the opposing member can be adjusted more accurately than when adjustment is performed using a single adjustment unit. [Explanation of symbols]

[0142] 10. Image forming system 32 Photosensitive drum (an example of an image carrier) 32A Shaft (Example of axial end) 38 Developing device 40 Exposure device (an example of an opposing member, an example of an exposure unit) 52 PCB 54 lens group 62 Developing roll (an example of an opposing member, an example of a developing unit) 80 Adjustment device (an example of an adjustment unit) 82A Temperature sensor (example of temperature detection part) 82B Temperature sensor (an example of a temperature detection unit) 82C Temperature sensor (example of temperature detection part) 82D Temperature sensor (example of temperature detection part) 90 Holder (an example of an intervening part, an example of a holding part) 92 Frame (an example of an intervening part, an example of a support part) 111 CPU (an example of a processor) 300 Image forming system 304 Adjustment device (an example of an adjustment unit) 306A Temperature sensor (example of temperature detection part) 306B Temperature sensor (example of temperature detection part) 306C Temperature sensor (example of temperature detection part) 306D Temperature sensor (example of temperature detection part) 310 Holder (an example of an intervening part, an example of a holding part) 314 Frame (an example of an intervening part, an example of a support part)

Claims

1. a rotating image carrier; an opposing member disposed opposite the image carrier and connected to the image carrier via an adjustment unit that adjusts the distance between the opposing member and the image carrier; a temperature detection unit provided on any two or more of the opposing member, the adjustment unit, and a component other than the adjustment unit that is interposed between the opposing member and the image carrier; An image forming system having:

2. a processor; The processor:

2. The image forming system according to claim 1, wherein the adjustment unit adjusts a variation in the distance between the image carrier and the opposing member based on the temperature detected by the temperature detection unit.

3. The opposing member is a lens group extending in the axial direction of the image carrier and including a plurality of lenses through which light for exposing the image carrier passes; a substrate on which a plurality of light-emitting elements that emit the light are mounted; 2. The image forming system according to claim 1, wherein the exposure section comprises:

4. The image forming system according to claim 3 , wherein the adjustment unit adjusts a variation in the focal position of the image carrier caused by the exposure unit.

5. The opposing member is 2. The image forming system according to claim 1, wherein the developing unit develops the electrostatic latent image formed on the image carrier by adhering toner.

6. a component other than the adjustment unit interposed between the opposing member and the image carrier includes a holding unit that holds an end of the image carrier in the axial direction, The image forming system according to claim 2 , wherein the temperature detecting unit is provided in the holding unit.

7. a component interposed between the opposing member and the image carrier other than the adjustment unit includes a support unit that supports the adjustment unit, The image forming system according to claim 2 , wherein the temperature detecting unit is provided on the support unit.

8. 2. The image forming system according to claim 1, wherein the temperature detection unit is a thermocouple.

9. 2. The image forming system according to claim 1, wherein the adjusting unit and the temperature detecting unit are provided at both ends in the axial direction of the opposing member and the image carrier, respectively.

10. 10. The image forming system according to claim 9, wherein the temperature detecting units are provided on the same component at both ends of the opposing member and the image carrier in the axial direction.

11. 10. The image forming system according to claim 9, wherein the adjustment unit is configured to independently adjust the distance between the image carrier and the opposing member at both axial ends of the opposing member and the image carrier.

Images