Glossiness detection device, image forming device, and paper transport system

Abstract

To provide a glossiness detection device, an image formation apparatus and a sheet conveyance system which can improve correction accuracy of a glossiness sensor.SOLUTION: A glossiness detection device comprises: a glossiness sensor; a glossiness correction unit; and a reference plate. The glossiness correction unit corrects the glossiness detected by the glossiness sensor. The reference plate is used for correction processing of the glossiness sensor. The glossiness correction unit acquires a gloss reflection profile of the reference plate that is detected in advance. The glossiness correction unit corrects the glossiness according to the reference plate on the basis of the gloss reflection profile and the glossiness distribution of the reference plate detected by the glossiness sensor.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a gloss level detection device, an image forming apparatus, and a paper transport system. [Background technology]

[0002] The image forming apparatus has an image forming unit that forms an image on a recording medium, and forms the image on the recording medium using the image forming unit based on output job information. The image forming apparatus also has a gloss detection device that has a gloss sensor that detects the gloss of the recording medium and the image formed on the recording medium.

[0003] Gloss detection devices perform a correction process (calibration) of the gloss sensor to correct for alignment errors between the light source and the light receiving unit, fluctuations in the light intensity of the light source, electrical variations in the drive circuit, etc. An example of the correction process for this gloss detection device is described in Patent Document 1. In Patent Document 1, a glass plate is used as a reference plate to calibrate the gloss detection device. Then, the correction process is performed by irradiating light onto the glass plate and detecting the amount of light reflected from the glass plate with the light receiving unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-140415 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 causes variations in gloss distribution when using a reference plate. Furthermore, when inexpensive glossy white paper or a white board is used as the reference plate instead of a glass plate, the variation in gloss distribution for each reference plate becomes larger compared to when using a glass plate. As a result, an error occurs in the correction value of the gloss sensor, making it impossible to accurately detect the gloss of the recording medium or the image formed on the recording medium.

[0006] SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a glossiness detection device, an image forming apparatus, and a paper transport system that can improve the correction accuracy of a glossiness sensor. [Means for solving the problem]

[0007] In order to solve the above problems and achieve the object of the present invention, a gloss detection device includes a gloss sensor, a gloss correction unit, and a reference plate. The gloss sensor has a light source that irradiates light and a light receiving unit that receives the light irradiated from the light source. The gloss correction unit corrects the gloss detected by the gloss sensor. The reference plate is used in the correction process of the gloss sensor. The gloss correction unit then acquires the gloss reflection profile of the reference plate detected in advance, and corrects the gloss according to the reference plate based on the gloss reflection profile and the gloss distribution of the reference plate detected by the gloss sensor.

[0008] An image forming apparatus according to the present invention includes the glossiness detection device described above. Also, a paper transport system according to the present invention includes the glossiness detection device described above in an image forming apparatus. [Effects of the Invention]

[0009] According to the gloss detection device, image forming apparatus, and paper transport system having the above configuration, the correction accuracy of the gloss sensor can be improved. [Brief explanation of the drawings]

[0010] [Figure 1]1 is a schematic diagram illustrating the overall configuration of an image forming apparatus according to an embodiment of the present invention; [Figure 2] 1 is a plan view showing a gloss sensor according to an embodiment of the present invention; [Figure 3] 1 is a schematic diagram illustrating a gloss sensor according to an embodiment of the present invention; [Figure 4] 1 is an explanatory diagram showing an example of the arrangement of a reference plate of a gloss sensor according to an embodiment of the present invention; [Figure 5] 1 is an explanatory diagram showing an example of the arrangement of a reference plate of a gloss sensor according to an embodiment of the present invention; [Figure 6] 1 is a block diagram showing a hardware configuration of an image forming apparatus according to an embodiment of the present invention; [Figure 7] 10 is a flowchart illustrating an example of a correction process operation of a gloss sensor according to an embodiment of the present invention. [Figure 8] 10A and 10B are explanatory diagrams illustrating an example of a correction processing operation of a gloss sensor according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to Figures 1 to 8. Note that common members in each figure are given the same reference numerals. Furthermore, the present invention is not limited to the following embodiments.

[0012] 1. Example of implementation 1-1.Configuration of image forming device First, the overall configuration of an image forming apparatus according to an embodiment of the present invention (hereinafter referred to as "this example") will be described. Fig. 1 is a schematic diagram of an image forming apparatus 1 according to this example.

[0013] The image forming apparatus 1 shown in FIG. 1 forms an image on paper using an electrophotographic method, and is a tandem color image forming apparatus that overlays four colors of toner: yellow (Y), magenta (M), cyan (C), and black (Bk).

[0014] The image forming apparatus 1 includes a document reading unit 21 equipped with an automatic document feeder (ADF) 22, and an operation display unit .

[0015] The document reading unit 21 optically reads an image from a document on the document feed table of the ADF 22, and performs A / D conversion on the read image to generate image data (scan data).

[0016] The operation display unit 23 is configured as a touch panel in which a touch sensor as an operation input unit is superimposed on a display unit made of an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence) display, or the like. Note that in this example, the display unit and the operation input unit are formed integrally, but this is not limiting. The operation input unit using buttons, keys, etc. and the display unit using an LCD, etc., may be configured separately.

[0017] The operation display unit 23 generates an operation signal representing the content of an operation input by the user to the operation unit, and supplies the operation signal to the control unit 10 (see FIG. 6). For example, when an operation instructing the start of image formation processing is input by the user, the operation display unit 23 generates a signal to start the image formation processing and supplies the signal to the control unit 10. Furthermore, for example, the operation display unit 23 displays the content of the operation by the user, setting information, etc. on the display unit based on a display signal supplied from the control unit 10.

[0018] The image forming apparatus 1 also includes a paper feed tray 24, a transport path 25, a paper discharge tray 26, an image forming unit 30, and a gloss sensor 40.

[0019] The paper feed tray 24 is a container that stores paper Sh on which images are formed in the image forming unit 30. The image forming apparatus 1 shown in FIG. 1 has two paper feed trays 24, but the number of paper feed trays 24 is not limited to this, and may be one, or three or more.

[0020] The transport path 25 transports the paper Sh fed from the paper feed tray 24 to the paper discharge tray 26. A plurality of rollers (transport rollers) for transporting the paper Sh are provided on the transport path 25. Note that, although the transport path 25 does not have a path or mechanism for double-sided printing, the present invention is not limited to this, and the present invention may be applied to an image forming apparatus that has a path and mechanism for double-sided printing.

[0021] Image forming section 30 includes four image forming units 31Y, 31M, 31C, and 31K for forming toner images of the respective colors of Y, M, C, and K. Image forming units 31Y, 31M, 31C, and 31K include a charging section, an LED writing unit (laser light source) (all not shown), photosensitive drums 32Y, 32M, 32C, and 32K, and developing sections 33Y, 33M, 33C, and 33K, respectively.

[0022] Developing units 33Y, 33M, 33C, and 33K form latent images on the surfaces (outer peripheries) of photoreceptor drums 32Y, 32M, 32C, and 32K, and cause toner supplied from a developing device (not shown) to adhere to the latent images, thereby forming toner images on photoreceptor drums 32Y, 32M, 32C, and 32K.

[0023] In the following description, when it is not necessary to distinguish between the image forming units 31Y, 31M, 31C, and 31K, they will be collectively referred to as image forming units 31. When it is not necessary to distinguish between the photosensitive drums 32Y, 32M, 32C, and 32K, they will be collectively referred to as photosensitive drum 32. When it is not necessary to distinguish between the developing units 33Y, 33M, 33C, and 33K, they will be collectively referred to as developing unit 33.

[0024] The image forming unit 30 also includes an intermediate transfer belt 34, a secondary transfer unit 35, and a fixing unit 36. The intermediate transfer belt 34 is endless and is wound around multiple pulleys. The intermediate transfer belt 34 is rotated by a drive motor (not shown) in a clockwise direction (the direction indicated by the arrow in the figure), which is opposite to the rotation direction of the photosensitive drum 32.

[0025] The secondary transfer unit 35 is a roller that performs a second transfer of the toner images of each color that have been primarily transferred onto the intermediate transfer belt 34 onto the paper Sh that has been transported on the transport path 25.

[0026] The fixing unit 36 ​​is provided downstream of the secondary transfer unit 35 in the transport direction of the transport path 25. The fixing unit 36 ​​performs a fixing process to fix the toner image transferred to the sheet Sh by the secondary transfer unit 35 onto the sheet Sh. The sheet Sh on which the toner image has been fixed by the fixing unit 36 ​​is transported on the transport path 25 and discharged onto the paper output tray 26.

[0027] The gloss sensor 40 is disposed downstream of the fixing unit 36 ​​in the transport direction. The gloss sensor 40 detects the glossiness of the paper Sh transported along the transport path 25 and of the image formed on the paper Sh. Note that, although the example in which the gloss sensor 40 is disposed downstream of the fixing unit 36 ​​has been described in this example, the present invention is not limited to this. For example, when detecting the glossiness of the paper Sh before fixing, the gloss sensor 40 may be disposed upstream of the fixing unit 36 ​​or the secondary transfer unit 35 in the transport direction.

[0028] 1-2. Gloss sensor configuration Next, an example of the configuration of the glossiness sensor 40 will be described with reference to FIGS. Fig. 2 is a plan view of the gloss sensor 40 as seen from above. Fig. 3 is a schematic diagram showing the gloss sensor 40.

[0029] As shown in FIGS. 2 and 3, the gloss sensor 40 has a plurality of light sources 41 and a plurality of light receiving units 42. The light sources 41 are arranged side by side along the width direction perpendicular to the transport direction of the paper Sh. The light sources 41 are configured, for example, with LEDs (Light Emitting Diodes) or laser oscillators. The light sources 41 irradiate light L, such as white light or ultraviolet light, onto the transported paper Sh and the image P formed on the paper Sh. In this example, the light sources 41 are arranged so that the incident angle θ of the irradiated light L with respect to the surface of the paper Sh is a predetermined angle. In order to detect specularly reflected light using the light receiving units 42, it is preferable that the light irradiated from the light sources 41 has a certain degree of directionality.

[0030] Similar to the light source 41, the multiple light receiving units 42 are arranged in a line along the width direction perpendicular to the transport direction of the paper Sh. The light receiving unit 42 is configured as a linear sensor in which light receiving elements such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) are arranged one-dimensionally in a direction along the transport direction of the paper Sh. The light receiving unit 42 acquires specularly reflected light that is irradiated from the light source 41 and reflected by the surface of the paper Sh. Note that, although an example in which the multiple light sources 41 and multiple light receiving units 42 are arranged in the width direction has been described, the present invention is not limited to this, and the multiple light sources 41 and multiple light receiving units 42 may also be arranged along the transport direction.

[0031] The gloss sensor 40 is also provided with a white reference plate 43 (see FIGS. 4 and 5) that serves as a reference plate for performing shading correction processing. The white reference plate 43 is made of, for example, white paper or a resin material such as PET. The white reference plate 43 reflects light irradiated from the light source 41 toward the light receiving unit 42. Note that, although the present example describes an example in which a white reference plate 43 is used as the reference plate, the present invention is not limited to this, and a colored plate may also be used as the reference plate.

[0032] There may be only one white reference plate 43, or a plurality of white reference plates 43 may be provided for each of the plurality of light sources 41 and the plurality of light receiving sections 42.

[0033] 4 and 5 are explanatory diagrams showing examples of the arrangement of the white reference plate 43. FIG. 4, the white reference plate 43 is placed on the transport path 25 along which the paper Sh is transported. In this case, the white reference plate 43 is supported by a movable mechanism (not shown) so as to be movable from above the transport path 25. When an image is formed on the paper Sh by the image forming apparatus 1, the white reference plate 43 is retracted by the movable mechanism to a position away from the transport path 25. When performing shading correction processing on the gloss sensor 40, the white reference plate 43 is moved onto the transport path 25 by the movable mechanism.

[0034] 5, the white reference plate 43 is disposed below the transport path 25. Therefore, the white reference plate 43 is disposed in advance at a position retracted from the transport path 25, eliminating the need for a moving mechanism for moving the white reference plate 43. The position where the white reference plate 43 is disposed is similar to the position where the glossiness of the white reference plate 43 is detected using a master sensor, which will be described later, and a gloss reflection profile is acquired.

[0035] 1-3. Hardware configuration of image forming device Next, the hardware configuration of the image forming apparatus will be described with reference to FIG. FIG. 6 is a block diagram showing the hardware configuration of the image forming apparatus 1. As shown in FIG.

[0036] The image forming apparatus 1 includes a control unit 10, a storage unit 14, a document reading unit 21, an operation display unit 23, an image forming unit 30, a gloss sensor 40, and a gloss correction unit 50.

[0037] The control unit 10 has, for example, a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12 for storing programs executed by the CPU 11, and a RAM (Random Access Memory) 13 used as a working area for the CPU 11.

[0038] The CPU 11 is connected to each unit constituting the image forming apparatus 1 via a system bus B. The CPU 11 controls the operation of each unit by communicating with each unit connected via the system bus B.

[0039] The CPU 11 controls the image forming unit 30 to form a toner image for image formation on the photosensitive drum 32 (see FIG. 1) and to primarily transfer the toner image onto the intermediate transfer belt 34 (see FIG. 1). The CPU 11 also controls the gloss sensor 40 to detect the gloss of the paper Sh and the image on the paper Sh.

[0040] The RAM 13 temporarily stores data and the like necessary for the CPU 11 to execute the programs. The ROM 12 is configured with nonvolatile memory such as a semiconductor memory, and stores a system program corresponding to the image forming apparatus 1 and various programs that can be executed on the system program. The programs stored in the ROM 12 are stored in the form of computer-readable program codes, and the CPU 11 sequentially executes operations in accordance with the program codes.

[0041] The storage unit 14 is configured by, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores a correction table used by the gloss correction unit 50 to correct the reflectance, a gloss reflection profile M (see FIG. 8) of the white reference plate 43 acquired in advance, and the like. The correction coefficients and gloss reflection profile M may be stored in the ROM 12 or the gloss correction unit 50 instead of the storage unit 14. Furthermore, the gloss reflection profile M may be acquired from an external server when performing shading correction processing of the gloss sensor 40, rather than being stored in the storage unit 14.

[0042] The gloss sensor 40 outputs the detected glossiness of the paper Sh and the image formed on the paper Sh to the control unit 10 and the glossiness correction unit 50 via the system bus B. The glossiness correction unit 50 calculates a correction coefficient based on the gloss reflection profile M of the white reference plate 43. Furthermore, the glossiness correction unit 50 corrects (calibrates) the alignment error and glossiness of the gloss sensor 40 based on the calculated correction coefficient. The glossiness sensor 40 and the glossiness correction unit 50 together form a glossiness detection device 60.

[0043] In addition, in this example, the glossiness detecting device 60 is installed in the image forming apparatus 1, but the present invention is not limited to this. The glossiness detecting device 60 may be installed in a paper transport system that feeds paper to the image forming apparatus 1 and transports paper discharged from the image forming apparatus 1.

[0044] 2. Example of gloss sensor correction processing operation Next, an example of the correction process operation of the glossiness sensor 40 in the image forming apparatus 1 having the above-described configuration will be described with reference to FIGS. Fig. 7 is a flowchart showing an example of the correction processing operation. Fig. 8 is an explanatory diagram showing an example of the correction processing operation. In Fig. 8, the vertical axis represents the amount of light, and the horizontal axis represents the number of pixels.

[0045] First, a gloss reflection profile M of a white reference plate 43 installed in the image forming apparatus 1 is acquired (step S11). The gloss reflection profile M is acquired by irradiating light onto the white reference plate 43 using a master sensor of the same type as the gloss sensor 40 or having equivalent performance, and measuring a gloss distribution waveform (target waveform) obtained by receiving the reflected light. The gloss reflection profile M acquired in the processing of step S11 is stored in the memory unit 14 or the gloss correction unit 50. Alternatively, when performing the processing of step S13 described below, the gloss correction unit 50 may acquire the gloss reflection profile M from a server provided outside the image forming apparatus 1.

[0046] For example, an identification number is assigned to the white reference plate 43, and the identification number of the white reference plate 43 is stored in the server in association with the gloss reflection profile M of the corresponding white reference plate 43. Then, when the user inputs the identification number of the white reference plate 43 into the image forming apparatus 1 or when the gloss correction unit 50 reads the identification number of the white reference plate 43, the gloss correction unit 50 obtains the gloss reflection profile M corresponding to the installed white reference plate 43 from the server.

[0047] Next, the white reference plate 43 from which the gloss reflection profile M has been acquired is installed in the image forming apparatus 1 (step S12). Note that the processes of steps S11 and S12 are performed, for example, when assembling the image forming apparatus 1, during a shipping inspection process for the image forming apparatus 1, or when replacing the white reference plate 43.

[0048] After the white reference plate 43 is placed in the image forming apparatus 1, the gloss distribution waveform N of the white reference plate 43 is obtained using the gloss sensor 40 provided in the image forming apparatus 1 (step S13). Next, the gloss correction unit 50 compares the gloss distribution waveform N read by the gloss sensor 40 provided in the image forming apparatus 1 with the gloss reflection profile M (step S14).

[0049] Next, the gloss correction unit 50 calculates a correction coefficient based on the difference A1 between the gloss reflection profile M and the gloss distribution waveform N (step S15). Then, the gloss correction unit 50 stores the calculated correction coefficient in the storage unit 14 or the like.

[0050] In the calculation process of the correction coefficient in step S15, for example, the gloss correction unit 50 detects the peak positions of the gloss reflection profile M and the gloss distribution waveform N. In the example shown in FIG. 8, the peak position of the gloss reflection profile M is at the position of 64 pixels, and the peak position of the gloss distribution waveform N is at the position of 74 pixels. Then, the gloss correction unit 50 calculates the amount of deviation between the peak positions as the difference A1. In the example shown in FIG. 8, the difference A1 corresponds to 10 pixels.

[0051] Next, the gloss correction unit 50 calculates the gain value of the light intensity of the gloss reflection profile M referenced for each pixel of the gloss distribution waveform N, i.e., the correction coefficient B. In the example shown in FIG. 8 , the pixel of the gloss reflection profile M compared with the 74th pixel of the gloss distribution waveform N is the 64th pixel. Then, a gain value B2 of the 64th pixel of the gloss reflection profile M relative to the 74th pixel of the gloss distribution waveform N is calculated. Furthermore, the pixel of the gloss reflection profile M compared with the 35th pixel of the gloss distribution waveform N is shifted by 10 pixels, so the pixel position is set to the 25th pixel. Then, a gain value B1 of the 35th pixel of the gloss reflection profile M relative to the 35th pixel of the gloss distribution waveform N is calculated. The gloss correction unit 50 performs the above-mentioned process for all pixels of the gloss distribution waveform N and calculates the correction coefficient for each pixel. This allows the distortion of the gloss distribution waveform N to be corrected.

[0052] Next, the gloss distribution waveform N is multiplied by the correction coefficient calculated in the processing of step S15 to correct the peak and width of the gloss distribution waveform N of the white reference plate 43. That is, the gloss correction unit 50 obtains a corrected waveform K shown by the dotted line in Fig. 8 by multiplying the gloss distribution waveform N by the correction coefficient. Furthermore, based on the difference A1 between the gloss reflection profile M and the gloss distribution waveform N, alignment errors of the white reference plate 43 and the gloss sensor 40 are calibrated (step S16).

[0053] As described above, in this example, the gloss reflection profile M of the white reference plate 43 to be installed in the apparatus is obtained in advance using a master sensor. Then, the correction coefficient is calculated by comparing this gloss reflection profile M with the gloss distribution waveform N of the white reference plate 43 when actually installed in the apparatus. This makes it possible to bring the corrected waveform K shown in FIG. 8 closer to the gloss reflection profile M. As a result, it is possible to match the data read from the white reference plate 43 by the master sensor with the data read from the white reference plate 43 installed in the image forming apparatus 1. Therefore, even if variations occur in the white reference plate 43, the correction accuracy of the gloss sensor 40 can be improved.

[0054] In this way, it is possible to obtain a correction coefficient according to the white reference plate 43. Furthermore, the glossiness correction unit 50 uses the calculated correction coefficient to correct the glossiness of the paper Sh and the image formed on the paper Sh detected by the glossiness sensor 40. This allows the glossiness detection accuracy in the glossiness detection device 60 to be improved.

[0055] The processes from step S13 to step S16 may be performed periodically, thereby correcting variations in the gloss distribution waveform caused by bending, dirt, etc. of the white reference plate 43. Furthermore, when the difference between the gloss distribution waveform N and the gloss reflection profile M or the correction coefficient exceeds a threshold value, the user can be notified that the white reference plate 43 needs to be replaced or cleaned, or that maintenance of the gloss sensor 40 needs to be performed.

[0056] The above describes the embodiments, including their effects. However, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the invention as defined in the claims.

[0057] In the above-described embodiment, a color image is formed using four sets of image forming units, but the image forming apparatus according to the present invention may also be configured to form a monochrome image using one image forming unit.

[0058] Furthermore, although an example of an electrophotographic image forming apparatus has been described as an image forming apparatus, the present invention is not limited to this, and for example, an inkjet printer that ejects ink onto a recording medium or various other image forming apparatuses may also be applied.

[0059] Furthermore, some or all of the above-described components, functions, processing units, etc. may be implemented in hardware, for example, by designing an integrated circuit. Furthermore, the above-described components, functions, etc. may be implemented in software by a processor interpreting and executing a program that implements each function. Information such as the programs, tables, and files that implement each function can be stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or in a storage medium such as an IC card, SD card, or DVD.

[0060] Furthermore, although an example in which paper is used as the recording medium has been described, the present invention is not limited to this, and various other materials such as film and fabric can also be used as the recording medium.

[0061] In this specification, the words "parallel" and "orthogonal" are used, but these do not mean only "parallel" and "orthogonal" in the strict sense, but also include "parallel" and "orthogonal" and may also mean a "substantially parallel" or "substantially orthogonal" state within a range in which the functions can be exerted. [Explanation of symbols]

[0062] REFERENCE SIGNS LIST 1...image forming apparatus, 10...control section, 11...CPU, 12...ROM, 13...RAM, 14...storage section, 21...document reading section, 22...automatic document feeder, 23...operation display section, 24...paper feed tray, 25...transport path, 26...paper output tray, 30...image forming section, 31...image forming unit, 32...photosensitive drum, 33...developing section, 34...intermediate transfer belt, 35...secondary transfer section, 36...fixing section, 40...gloss sensor, 41...light source, 42...light receiving section, 43...white reference plate (reference plate), 50...gloss correction section, 60...gloss detection device

Claims

1. a glossiness sensor having a light source that irradiates light and a light receiving unit that receives the light irradiated from the light source; a glossiness correction unit that corrects the glossiness detected by the glossiness sensor; a reference plate used in the correction process of the gloss sensor, the gloss correction unit acquires a gloss reflection profile of the reference plate detected in advance, and corrects the gloss according to the reference plate based on the gloss reflection profile and the gloss distribution of the reference plate detected by the gloss sensor; the gloss correction unit calculates a correction coefficient for correcting the gloss distribution of the reference plate based on the gloss reflection profile and the gloss distribution of the reference plate detected by the gloss sensor; the gloss correction unit calculates a deviation amount of the gloss sensor from a peak position of the gloss reflection profile and a peak position of the gloss distribution, and calculates the correction coefficient based on the deviation amount; the light receiving unit of the gloss sensor is a linear sensor having a plurality of light receiving elements, The gloss correction unit calculates the correction coefficient for each pixel in the gloss sensor based on the amount of deviation. Gloss detection device.

2. The gloss correction unit corrects the shape of the gloss distribution on the reference plate based on the correction coefficient. The gloss detection device according to claim 1 .

3. A memory unit for storing the gloss reflection profile The gloss detection device according to claim 1 .

4. the gloss sensor includes a plurality of the light receiving units, and has a plurality of the gloss reflection profiles corresponding to the respective light receiving units; The storage unit stores a plurality of glossy reflection profiles in association with each other. The gloss detection device according to claim 3 .

5. The gloss correction unit determines whether there is an abnormality in the gloss sensor or the reference plate based on the calculated correction coefficient. The gloss detection device according to claim 1 .

6. The reference plate is assigned an identification number, the glossy reflection profile is associated with the identification number; The gloss correction unit acquires the gloss reflection profile based on the identification number. The gloss detection device according to claim 1 .

7. The reference plate is made of white paper, colored paper, or a resin material. The gloss detection device according to claim 1 .

8. The gloss reflection profile is measured using a master sensor of the same type as the gloss sensor. The gloss detection device according to claim 1 .

9. The reference plate is a reference plate for performing shading correction. The gloss detection device according to any one of claims 1 to 8.

10. A device equipped with a glossiness detection device according to any one of claims 1 to 9. Image forming device.

11. A device comprising the gloss detection device according to any one of claims 1 to 9. Paper transport system.

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