Measurement system and image formation system

Abstract

To distinguish between cases where an object to be measured is highly transparent to light and cases where the object to be measured is not present in a measurement area.SOLUTION: A measurement system includes: a first light-emitting unit that emits light toward an object to be measured; a first light-receiving unit that receives light transmitted through the object to be measured; measurement means that measures at least one of the electrical resistance and the ultrasonic transmissivity of the object to be measured; and a processor. The processor determines, based on the intensity of light received by the first light-receiving unit and measurement results obtained by the measurement means, whether the object to be measured is a highly light-transmissive object or whether the object to be measured is present in a measurement region.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a recording material discrimination device that is characterized by comprising a reflective detection means that detects light reflected from the surface of the object to be detected, a transmissive detection means that detects whether the object to be detected transmits light or not, and a discrimination means that discriminates the type of the object to be detected by inputting detection signals from the reflective detection means and the transmissive detection means at different times.

[0003] Patent document 2 discloses an image forming apparatus comprising: a conveying means for conveying a medium on which an image is to be formed; a first detection means for detecting the basis weight of the medium conveyed by the conveying means; a second detection means for detecting that the type of medium conveyed by the conveying means is an envelope; and a judgment means for determining, based on the detection result of the second detection means, whether to detect the basis weight of the medium using the first detection means or whether to use the detection result of the first detection means.

[0004] Patent Document 3 discloses a sheet discrimination device in which a light-emitting element that irradiates light onto the surface of a sheet and a light-receiving element that receives reflected light from the surface of the sheet are arranged so that the light-receiving element does not directly receive specularly reflected light from the surface of the sheet, and at least one of the optical axes of the light-emitting element and the light-receiving element is arranged at a predetermined angle with respect to the surface of the sheet so that the optical axis of the light-receiving element is not located within a plane formed by the optical axis of the light-emitting element and the light irradiated from the light-emitting element and specularly reflected by the surface of the sheet. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-40605 [Patent Document 2] Japanese Patent Application Publication No. 2020-100490 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-40487 Summary of the Invention [Problem to be solved by the invention]

[0006] The present disclosure aims to distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object is not present in the measurement area. [Means for solving the problem]

[0007] A first aspect of the present disclosure is a measurement system comprising a first light-emitting unit that emits light toward a measurement object, a first light-receiving unit that receives light that has passed through the measurement object, a measurement means that measures at least one of the electrical resistance and ultrasonic transmittance of the measurement object, and a processor, wherein the processor determines whether the measurement object is an object with high light transmittance or whether the measurement object is present in a measurement area based on the magnitude of the light received by the first light-receiving unit and the measurement results by the measurement means.

[0008] A second aspect of the present disclosure is a measurement system in which, in the measurement system of the first aspect, the measurement means includes a power source and a pair of electrodes that apply a voltage to the object to be measured, and the processor determines the presence or absence of the object to be measured in the measurement area based on the electrical resistance of the object to be measured.

[0009] A third aspect of the present disclosure is a measurement system in which, in the measurement system of the second aspect, the processor determines whether the object to be measured is an object with high light transmittance or whether the object to be measured is present in the measurement area based on the magnitude of the light received by the first light receiving unit and the electrical resistance.

[0010] A fourth aspect of the present disclosure is a measurement system in which, in the measurement system of the first aspect, the measurement means comprises a transmitter that emits ultrasonic waves toward the object to be measured and a receiver that receives ultrasonic waves that have passed through the object to be measured, and the processor determines whether the object to be measured is present in the measurement area based on the transmittance of ultrasonic waves from the object to be measured.

[0011] A fifth aspect of the present disclosure is a measurement system in which, in the measurement system of the fourth aspect, the processor determines whether the object to be measured is not present in the measurement area or whether the object to be measured is an object with high light transmittance based on the magnitude of the light received by the first light receiving unit and the transmittance of the ultrasound.

[0012] A sixth aspect of the present disclosure is a measurement system according to the first aspect, which includes a second light-emitting unit that emits light of multiple different wavelengths toward the object to be measured, and a second light-receiving unit that receives light reflected by the object to be measured, and the processor determines the color of the object to be measured based on the wavelength and intensity of the light received by the second light-receiving unit.

[0013] A seventh aspect of the present disclosure is a measurement system in which, in the measurement system of the sixth aspect, a holding part for holding the object to be measured is arranged, and the processor acquires the color of the holding part in advance, and when the acquired color of the holding part corresponds to the color of the object to be measured, determines whether the object to be measured is an object with high light transmittance or whether the object to be measured is present in the measurement area based on the magnitude of the light received by the first light receiving part and the measurement result by the measurement means.

[0014] An eighth aspect of the present disclosure is a measurement system in which, in the measurement system of the first aspect, a transport unit is provided for transporting the object to be measured, and the first light-emitting unit, the first light-receiving unit, and the measurement means are provided on a transport path for the object to be measured.

[0015] A ninth aspect of the present disclosure is a measurement system according to the first aspect, wherein the measurement means comprises a power source, a pair of electrodes that apply a voltage to the object to be measured, a transmitter that emits ultrasonic waves toward the object to be measured, and a receiver that receives ultrasonic waves that have passed through the object to be measured, and the processor, when the presence or absence of the object to be measured in the measurement area based on the electrical resistance of the object to be measured differs from the presence or absence of the object to be measured in the measurement area based on the transmittance of ultrasonic waves of the object to be measured, compares the measurement position of the electrical resistance with the measurement position of the transmittance of ultrasonic waves in the measurement area and determines the priority of the electrical resistance and the transmittance of ultrasonic waves.

[0016] A tenth aspect of the present disclosure is a measurement system according to the ninth aspect, further comprising a setting section in which the sheet-shaped measurement object is set, and the processor compares the measurement position of the electrical resistance in the measurement area with the measurement position of the ultrasonic transmittance, and prioritizes the measurement position located on the opposite side of the setting direction in which the measurement object is set in the setting section.

[0017] An eleventh aspect of the present disclosure is an image forming system comprising a measurement system according to any one of the first to tenth aspects, and an image forming unit that forms an image on a recording medium as the measurement object whose color or light transmittance has been measured by the measurement system. [Effects of the Invention]

[0018] The measurement system of the first aspect can distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object does not exist in the measurement region.

[0019] In the measurement system of the second aspect, the presence or absence of a measurement object in a measurement area can be determined with higher accuracy than when the presence or absence of a measurement object is determined in a non-contact manner.

[0020] In the measurement system of the third aspect, compared to when determining the presence or absence of a measurement object in a non-contact manner, it is possible to more accurately distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object is not present in the measurement area.

[0021] In the measurement system of the fourth aspect, the burden on the measurement object can be reduced compared to when the presence or absence of the measurement object is determined by contact.

[0022] In the measurement system of the fifth aspect, it is possible to distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object is not present in the measurement area while reducing the burden on the measurement object.

[0023] In the measurement system of the sixth aspect, the device configuration can be simplified compared to a configuration in which a plurality of second light-emitting units that emit light of different wavelengths are provided.

[0024] The measurement system of the seventh aspect can distinguish between cases where the object to be measured is the same color as the holder, cases where the object to be measured is an object with high light transmittance, and cases where there is no object to be measured in the measurement area.

[0025] In the measurement system of the eighth aspect, it is possible to continuously distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object does not exist in the measurement region.

[0026] In the measurement system of the ninth aspect, regardless of the measurement position of the electrical resistance and the measurement position of the ultrasonic transmittance, the presence or absence of the object to be measured in the measurement area can be determined more accurately than in a system that prioritizes a predetermined measurement method.

[0027] In the measurement system of the tenth aspect, the measurement position of the electrical resistance in the measurement area is compared with the measurement position of the ultrasonic transmittance, and the presence or absence of the object to be measured in the measurement area can be determined more accurately than in a system that prioritizes the measurement position on the set direction side.

[0028] In the image forming system of the eleventh aspect, the quality of the image formed on the recording medium is improved compared to when the user sets the color or light transmittance of the recording medium. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a block diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention; [Figure 2] 1 is a schematic diagram showing the configuration of a measurement device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a block diagram showing an example of a hardware configuration of a control circuit according to the present embodiment. [Figure 4] FIG. 2 is a block diagram showing an example of the functional configuration of a processor of the control circuit according to the present embodiment. [Figure 5] 4 is a flowchart showing the flow of a control process according to the present embodiment. [Figure 6] 10 is a graph showing the relationship between light transmittance and electrical resistance value for paper. [Figure 7] 1 is a graph showing the relationship between light transmittance and basis weight for paper. [Figure 8] 10 is a flowchart showing the flow of a control process according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0030] An image forming apparatus 10 as an example of an image forming system according to an embodiment of the present disclosure and a measuring apparatus 20 as an example of a measuring system will be described with reference to Figures 1 to 5. First, the image forming apparatus 10 will be described.

[0031] (Image forming device 10) FIG. 1 is a block diagram showing the configuration of an image forming apparatus 10 according to this embodiment.

[0032] Image forming apparatus 10 is an apparatus that forms an image on paper P as a recording medium. Specifically, as shown in Fig. 1, image forming apparatus 10 includes image forming apparatus main body 11, medium storage section 12, image forming section 14, conveyance mechanism 15, control device 16, measuring device 20, and operation section 18. Each section of image forming apparatus 10 will be described below.

[0033] (Image forming apparatus main body 11) 1 is a portion in which the components of the image forming apparatus 10 are provided. Specifically, the image forming apparatus main body 11 is configured as, for example, a box-shaped housing. In this embodiment, the medium storage unit 12, the image forming unit 14, and the transport mechanism 15 are provided inside the image forming apparatus main body 11.

[0034] (medium storage section 12) 1 is a portion of the image forming apparatus 10 that stores paper sheets P. The paper sheets P stored in the medium storing portion 12 are supplied to the image forming portion 14.

[0035] (Image forming unit 14) 1 has a function of forming an image on paper P supplied from the medium storage unit 12. Examples of the image forming unit 14 include an inkjet image forming unit that forms an image on paper P using ink, and an electrophotographic image forming unit that forms an image on paper P using toner.

[0036] In an inkjet image forming unit, for example, ink droplets are ejected from an ejection unit onto paper P to form an image on paper P. In the inkjet image forming unit, ink droplets may be ejected from the ejection unit onto a transfer body, and the ink droplets may be transferred from the transfer body to paper P to form an image on paper P.

[0037] In an electrophotographic image forming unit, for example, the steps of charging, exposing, developing, transferring, and fixing are performed to form an image on paper P. The electrophotographic image forming unit may form an image on paper P by performing the steps of charging, exposing, developing, and transferring to form an image on a transfer body, transferring the image from the transfer body to paper P, and then fixing the image to paper P.

[0038] Note that examples of the image forming unit are not limited to the inkjet image forming unit and the electrophotographic image forming unit described above, and various other image forming units can be used.

[0039] (Transport mechanism 15) 1 is a mechanism for transporting paper P. The transport mechanism 15 transports paper P by, for example, transport members (not shown) such as transport rolls and transport belts. The transport mechanism 15 transports paper P from the medium storage unit 12 to the image forming unit 14 along a predetermined transport path.

[0040] (Operation unit 18) 1 is a device operated by a user of the image forming apparatus 10, and transmits, for example, measurement instructions to the measuring apparatus 20 and image formation instructions to the control apparatus 16 through user operation. The operation unit 18 is configured, for example, with an operation panel such as a touch display. In the example shown in FIG. 1, the operation unit 18 is provided in a location separate from the image forming apparatus main body 11, but it may also be provided in the image forming apparatus main body 11.

[0041] (Overview of the control device 16 and the measurement device 20) 1, the measuring device 20 and the control device 16 are, for example, provided outside the image forming apparatus main body 11. The control device 16 is configured with a control unit (control board) having a recording unit configured with a storage or the like in which a program is recorded, and a processor that operates according to the program.

[0042] In this embodiment, the user of image forming apparatus 10 places, for example, a sheet of paper P on which an image is to be formed in measuring device 20 and issues a measurement instruction via operation unit 18. Upon receiving the measurement instruction from operation unit 18, measuring device 20 measures the sheet of paper P based on preset items and stores the measurement value information in memory 82 or storage 83.

[0043] A user of image forming apparatus 10 places paper P that has been measured by measuring device 20 in medium storage unit 12, and issues an image formation instruction from operation unit 18. The image formation instruction may also serve as a measurement instruction.

[0044] When the control device 16 receives an image formation instruction from the operation unit 18, it causes the image forming unit 14 and the transport mechanism 15 to perform an image formation operation, and controls the operations of the image forming unit 14 and the transport mechanism 15 based on the measurement value information. Specifically, the control device 16 controls the transport speed of the paper P in the transport mechanism 15, as well as the transfer voltage and fixing temperature in the image forming unit 14, based on the measurement value information, but the present disclosure is not limited to this configuration.

[0045] In the above example, the control device 16 is provided outside the image forming apparatus main body 11, but it may be provided inside the image forming apparatus main body 11. The control device 16 may also be configured to acquire measurement value information directly from the measuring device 20.

[0046] Furthermore, although the measuring device 20 is provided outside the image forming apparatus main body 11, it may be provided inside the image forming apparatus main body 11. Specifically, the measuring device 20 may be configured as a device that measures the paper P based on preset items in the medium storage unit 12 or in the transport path of the paper P.

[0047] (Specific configuration of the measuring device 20) FIG. 2 is a schematic diagram showing the configuration of a measuring device 20 according to this embodiment. The arrow UP shown in the figure indicates the upper side (vertically upward) of the device, the arrow FR shown in the figure indicates the front side of the device, and the arrow RR indicates the rear side of the device. These directions are defined for the convenience of explanation, and the device configuration is not limited to these directions. Note that the word "device" may be omitted in each direction of the device. For example, "above the device" may be simply referred to as "above."

[0048] In the following description, the "up-down direction" may be used to mean "both above and below" or "either above or below." The "left-right direction" may be used to mean "both right and left" or "either right or left." The "left-right direction" may also be referred to as the lateral direction or horizontal direction. The "front-rear direction" may be used to mean "both forward and backward" or "either forward or backward." The front-rear direction may also be referred to as the lateral direction or horizontal direction. Furthermore, the up-down direction, left-right direction, and front-rear direction are directions that intersect with each other (specifically, directions that are perpendicular to each other).

[0049] In addition, the symbol "x" inside a "circle" in the figure indicates an arrow pointing from the front to the back of the page. In addition, the symbol "·" inside a "circle" in the figure indicates an arrow pointing from the back to the front of the page.

[0050] Furthermore, components indicated by the same reference numerals in each drawing are the same or similar components. Note that duplicated explanations and reference numerals may be omitted in the embodiments described below. Furthermore, all drawings used in the following description are schematic, and the dimensional relationships, ratios, etc. of the elements shown in the drawings do not necessarily match those in reality. Furthermore, the dimensional relationships, ratios, etc. of the elements do not necessarily match between multiple drawings.

[0051] The measuring device 20 is a device that measures color information and the like of the paper P used in the image forming apparatus 10. Specifically, the measuring device 20 has the function of measuring the color, light transmittance, ultrasonic wave transmittance, and electrical resistance of the paper P. The paper P is an example of a "measurement object."

[0052] 2, the measuring device 20 specifically includes a first housing 21, a second housing 22, a color measuring unit 30, an ultrasonic measuring unit 40, a transmitted light measuring unit 50, and a resistance measuring unit 60. Each unit of the measuring device 20 will be described below.

[0053] (First enclosure 21) The first housing 21 is a portion in which some of the components of the measurement device 20 are provided. This first housing 21 forms the lower portion of the measurement device 20. The first housing 21 has an opposing surface 21A that faces the lower surface of the paper P. The opposing surface 21A is also a support surface (holding surface) that supports (holds) the paper P from below. The opposing surface 21A is an example of a "holding portion." Inside the first housing 21, the color measurement unit 30, part of the ultrasonic measurement unit 40, part of the transmitted light measurement unit 50, and part of the resistance measurement unit 60 are arranged.

[0054] (Second housing 22) The second housing 22 is a portion where other parts of each component of the measuring device 20 are provided. This second housing 22 constitutes the upper portion of the measuring device 20. The second housing 22 has an opposing surface 22A that faces the upper surface of the paper P. Inside the second housing 22, other parts of the ultrasonic measurement unit 40, other parts of the transmitted light measurement unit 50, and other parts of the resistance measurement unit 60 are arranged. In the measuring device 20, a paper sheet P as an example of a measurement object is set between the first housing 21 and the second housing 22 from the direction of arrow A (hereinafter referred to as the "setting direction" as appropriate). The space between the first housing 21 and the second housing 22 where the paper sheet P is set for measurement is referred to as the setting section SR. The area of ​​the paper sheet P set in the setting section SR is referred to as the measurement area. In addition, a stopper section 21T is provided at the back of the setting section SR, which serves as a reference for setting the paper sheet P in the setting section SR.

[0055] The second housing 22 is configured to be movable relative to the first housing 21, for example, in a direction approaching and moving away from the first housing 21 (specifically, in the up and down direction), and after the paper P is placed between the first housing 21 and the second housing 22, it moves relative to the first housing 21 in a direction approaching the first housing 21, and is positioned at the position shown in Figure 2.

[0056] (Color measurement section 30) The color measurement unit 30 shown in Fig. 2 has a function of measuring the color of paper P. Specifically, as shown in Fig. 2, the color measurement unit 30 has a drive circuit 31, a light emitting unit 32, a light receiving unit 35, and a processing unit 36. The light emitting unit 32 is an example of a "second light emitting unit." The light receiving unit 35 is an example of a "second light receiving unit."

[0057] The light irradiation unit 32 emits light of a plurality of different wavelengths toward the paper P, that is, has the function of irradiating the paper P with light of a plurality of different wavelengths. Specifically, the light irradiation unit 32 irradiates the paper P with light of wavelengths corresponding to R (red), G (green), and B (blue). The light irradiation unit 32 is disposed in the second housing 22. That is, the light irradiation unit 32 is disposed at a position facing one surface (specifically, the upper surface) of the paper P with a gap therebetween. Note that an opening 23 is formed below the light irradiation unit 32 in the second housing 22, which allows light from the light irradiation unit 32 to pass through to the paper P.

[0058] The drive circuit 31 is a circuit that drives the light irradiation unit 32. When the drive circuit 31 drives the light irradiation unit 32, the light irradiation unit 32 irradiates the paper P with light, and the light is reflected by the paper P.

[0059] The light receiving unit 35 has a function of receiving light reflected by the paper sheet P. The light receiving unit 35 is disposed in the second housing 22. That is, the light receiving unit 35 is disposed in a position facing one surface (specifically, the upper surface) of the paper sheet P with a gap therebetween. The light receiving unit 35 receives the light reflected by the paper sheet P and generates a light reception signal. An opening 23 extends below the light receiving unit 35 in the second housing 22, and allows light from the paper sheet P side to pass through to the light receiving unit 35.

[0060] In this way, in the color measurement unit 30, the light irradiation unit 32 and the light receiving unit 35 constitute a detection unit (specifically, a detection sensor) that detects color information of the paper P (specifically, light reflected by the paper P). A drive circuit 31 constitutes a circuit that drives the detection unit.

[0061] The processing unit 36 ​​performs processing such as amplification on the light receiving signal obtained from the light receiving unit 35 to obtain a measurement value. Furthermore, the processing unit 36 ​​stores the obtained measurement value information, which is color information, in the memory 82 or the storage 83. The processing unit 36 ​​is configured, for example, with an electric circuit including an amplifier circuit, etc.

[0062] (ultrasonic measuring unit 40) The ultrasonic measurement unit 40 shown in Fig. 2 has a function of measuring the ultrasonic transmittance of the paper P. Specifically, it has a function of vibrating the paper P by applying ultrasonic waves to it, thereby measuring the presence or absence of the paper P. The ultrasonic measurement unit 40 is an example of a "measurement means."

[0063] As shown in FIG. 2, the ultrasonic measurement unit 40 includes a drive circuit 41, a transmitter 42, a receiver 45, and a processor 46.

[0064] The transmitter 42 emits ultrasonic waves toward the paper P, that is, it has the function of emitting ultrasonic waves to the paper P. The transmitter 42 is disposed in the second housing 22. That is, the transmitter 42 is disposed at a position facing one surface (specifically, the upper surface) of the paper P. Note that below the transmitter 42 in the second housing 22, an opening 24 is formed to allow the ultrasonic waves from the transmitter 42 to pass through to the paper P.

[0065] The drive circuit 41 is a circuit that drives the transmitter 42. When the drive circuit 41 drives the transmitter 42, the transmitter 42 applies ultrasonic waves to the upper surface of the paper P, vibrating the paper P. The vibrated paper P vibrates the air below the paper P. In other words, the ultrasonic waves from the transmitter 42 pass through the paper P.

[0066] The receiving unit 45 has the function of receiving ultrasonic waves that have passed through the paper P. The receiving unit 45 is disposed in the first housing 21. That is, the receiving unit 45 is disposed at a position facing the other surface (specifically, the bottom surface) of the paper P. The receiving unit 45 generates a reception signal by receiving the ultrasonic waves that have passed through the paper P. An opening 25 is formed above the receiving unit 45 in the first housing 21, allowing the ultrasonic waves from the paper P side to pass through to the receiving unit 45.

[0067] In this way, in the ultrasonic measurement unit 40, the transmitter 42 and receiver 45 constitute a detection unit (specifically, a detection sensor) that detects information indicating the basis weight of the paper P (specifically, ultrasonic waves that have passed through the paper P). A drive circuit 41 constitutes a circuit that drives the detection unit.

[0068] The processing unit 46 obtains a measurement value by performing processing such as amplification on the received signal obtained from the receiving unit 45. Furthermore, the processing unit 46 stores the obtained measurement value information indicating the transmittance of the ultrasonic wave in the memory 82 or the storage 83. As an example, the processing unit 46 is configured by an electric circuit including an amplifier circuit and the like.

[0069] (Transmitted light measurement section 50) The transmitted light measuring unit 50 shown in FIG. 2 has a function of measuring the transmittance of paper P. Specifically, as shown in FIG. 2, the transmitted light measuring unit 50 has a drive circuit 51, a light emitting unit 52, a light receiving unit 55, and a processing unit 56. The light emitting unit 52 is an example of a "first light emitting unit." The light receiving unit 55 is an example of a "first light receiving unit."

[0070] The light irradiation unit 52 emits light toward the paper P, that is, has the function of irradiating the paper P with light. The light irradiation unit 52 is disposed in the second housing 22. That is, the light irradiation unit 52 is disposed in a position facing one surface (specifically, the upper surface) of the paper P with a gap therebetween. Note that an opening 26 is formed below the light irradiation unit 52 in the second housing 22, allowing the light from the light irradiation unit 52 to pass through to the paper P.

[0071] The drive circuit 51 is a circuit that drives the light irradiation unit 52. When the drive circuit 51 drives the light irradiation unit 52, the light irradiation unit 52 irradiates the paper P with light.

[0072] The light receiving unit 55 has the function of receiving light that has passed through the paper P. The light receiving unit 55 is disposed in the first housing 21. That is, the light receiving unit 55 is disposed in a position facing the other surface (specifically, the upper surface) of the paper P with a gap therebetween. The light receiving unit 55 receives the light that has passed through the paper P and generates a light reception signal. An opening 27 is formed above the light receiving unit 55 in the first housing 21, allowing light from the paper P side to pass through to the light receiving unit 55.

[0073] In this way, in the transmitted light measuring unit 50, the light irradiating unit 52 and the light receiving unit 55 constitute a detecting unit (specifically, a detection sensor) that detects information relating to the transmittance of the paper P (specifically, the reflected light reflected by the paper P). A driving circuit 51 constitutes a circuit that drives the detecting unit.

[0074] The processing unit 56 performs processing such as amplification on the light receiving signal obtained from the light receiving unit 55 to obtain a measurement value. Furthermore, the processing unit 56 stores the obtained measurement value information indicating the light transmittance in the memory 82 or the storage 83. The processing unit 56 is configured, for example, by an electric circuit including an amplifier circuit and the like.

[0075] (Resistance measuring unit 60) 2 has a function of measuring the electrical resistance (volume resistance value [Ω] in this embodiment) of the paper P. The resistance measuring unit 60 is an example of a "measuring means."

[0076] 2, the resistance measuring unit 60 has an electric circuit 61, a pair of terminals 62, a power source 63, a detection circuit 65, and a processing unit 66. The pair of terminals 62 is an example of a "pair of electrodes."

[0077] Of the pair of terminals 62, one terminal 62 is disposed on the first housing 21, and the other terminal 62 is disposed on the second housing 22. Specifically, one terminal 62 of the pair of terminals 62 contacts the lower surface of the paper P through the opening 29 formed in the first housing 21, and the other terminal 62 contacts the upper surface of the paper P through the opening 28 formed in the second housing 22. This causes the paper P to be sandwiched vertically between the pair of terminals 62. Note that, for example, one terminal 62 of the pair of terminals 62 may be biased toward the other terminal 62. This biasing makes it easier to sandwich the paper P between the pair of terminals 62. Furthermore, the paper P may be sandwiched between the pair of terminals 62 after the paper P is inserted between the first housing 21 and the second housing 22, or the paper P may be inserted beforehand into a portion where the pair of terminals 62 are in contact with each other. Each of the pair of terminals 62 is electrically connected to a power source 63 via an electrical circuit 61.

[0078] The power supply 63 applies a predetermined voltage ([V]) to the pair of terminals 62 through the electric circuit 61. As a result, a current corresponding to the body surface resistance flows inside the paper P located between the pair of terminals 62. The detection circuit 65 is electrically connected to the pair of terminals 62. The detection circuit 65 detects the current flowing between the pair of terminals 62 to generate a detection signal.

[0079] In this way, in the resistance measuring unit 60, the pair of terminals 62 and the detection circuit 65 constitute a detection unit (specifically, a detection sensor) that detects information indicating the volume resistance of the paper P (specifically, the current flowing through the paper P). The electric circuit 61 constitutes a circuit that drives the detection unit.

[0080] The processing unit 66 performs processing such as amplification on the detection signal obtained from the detection circuit 65 to obtain a measurement value (specifically, a current value [A]). Furthermore, the processing unit 66 stores information indicating the obtained electrical resistance value in the memory 82 or the storage 83. The processing unit 66 is configured, for example, by an electric circuit including an amplifier circuit, etc.

[0081] Although the resistance measuring unit 60 is configured to apply a predetermined voltage to the pair of terminals 62 and detect the current flowing between the pair of terminals 62 to determine the volume resistance value, the present disclosure is not limited to this configuration. For example, the resistance measuring unit 60 may be configured to apply a current of a predetermined value to the pair of terminals 62 and detect the voltage between the pair of terminals 62 to determine the volume resistance value.

[0082] (Control circuit 80) The control circuit 80 has a control function for controlling the operation of each part (color measurement part 30, ultrasonic measurement part 40, transmitted light measurement part 50, and resistance measurement part 60) of the measurement device 20. Specifically, the control circuit 80 has a processor 81, a memory 82, and a storage 83, as shown in FIG.

[0083] The term "processor" refers to a processor in a broad sense, and examples of processor 81 include general-purpose processors (e.g., CPU (Central Processing Unit)) and dedicated processors (e.g., GPU: Graphics Processing Unit, ASIC: Application Specific Integrated Circuit, FPGA: Field Programmable Gate Array, programmable logic device, etc.).

[0084] The storage 83 stores various programs including a control program 83A (see FIG. 4) and various data. Specifically, the storage 83 is realized by a recording device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a flash memory.

[0085] The memory 82 is a work area for the processor 81 to execute various programs, and temporarily stores various programs or various data when the processor 81 executes processing. The processor 81 reads various programs including the control program 83A from the storage 83 into the memory 82, and executes the programs using the memory 82 as a work area.

[0086] In the control circuit 80, the processor 81 executes the control program 83A to realize various functions. The following describes the functional configuration realized by the cooperation of the processor 81 as a hardware resource and the control program 83A as a software resource. Figure 4 is a block diagram showing the functional configuration of the processor 81.

[0087] 4, in the control circuit 80, the processor 81 executes a control program 83A to function as an acquisition unit 81A and a control unit 81B. The acquisition unit 81A acquires a measurement instruction to measure the paper P from the operation unit 18.

[0088] When the acquisition unit 81A acquires the measurement instruction, the control unit 81B controls each measurement unit to measure the paper P.

[0089] In this embodiment, in the measurement control, based on the magnitude of the light received by the light receiving unit 35 and the measurement results of the electrical resistance or ultrasonic transmittance, it is determined whether the paper P is highly light-transmitting paper or whether paper P is present in the measurement area.

[0090] Specifically, the control unit 81B drives the color measurement unit 30 to determine the color of the paper P. More specifically, the color of the paper P is determined based on the wavelength and intensity of the light reflected from the paper P.

[0091] The control unit 81B acquires the color of the facing surface 21A in advance, and when the acquired color of the facing surface 21A corresponds to the color of the identified paper P, it determines that the paper P is an object with high light transmittance, or that there is a possibility that the paper P is not present in the measurement area. When such a determination is made, the control unit 81B performs measurements using the transmitted light measurement unit 50, the ultrasonic measurement unit 40, and the resistance measurement unit 60.

[0092] The control unit 81B drives the transmitted light measuring unit 50 to determine the light transmittance of the paper P. Based on the determined light transmittance, it is determined whether the paper P is a paper with high light transmittance. For example, if the light transmittance of the paper P exceeds a predetermined threshold, the paper P is determined to be transparent.

[0093] The control unit 81B also drives the ultrasonic measurement unit 40 to determine the ultrasonic transmittance of the paper P. The determined ultrasonic transmittance determines whether the paper P is present in the measurement area. For example, if the ultrasonic transmittance of the paper P exceeds a predetermined threshold, it is determined that the paper P is not present in the measurement area. Note that, for example, when determining based on basis weight, as shown in FIG. 7, if the basis weight is below the threshold, it is determined that the paper P is not present in the measurement area.

[0094] The control unit 81B also drives the resistance measurement unit 60 to determine the electrical resistance of the paper P. The determined electrical resistance is used to determine whether the paper P is present in the measurement area. For example, as shown in FIG. 6, if the electrical resistance of the paper P is below a predetermined threshold (as an example, the dashed line in FIG. 6), it is determined that the paper P is not present in the measurement area.

[0095] Here, when the determination of the presence or absence of paper P in the measurement area based on the electrical resistance of paper P differs from the determination of the presence or absence of paper P in the measurement area based on the ultrasonic transmittance of paper P, the control unit 81B compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area and determines the priority of which of the electrical resistance and the ultrasonic transmittance to prioritize. Specifically, the control unit 81B compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area and prioritizes the measurement position located on the opposite side in the setting direction A in which paper P is set in the setting unit SR. In this embodiment, as an example, the resistance measurement unit 60 is located closer to the entrance of the setting direction A than the ultrasonic measurement unit 40, i.e., on the opposite side in the setting direction A, so the determination based on the electrical resistance is prioritized.

[0096] The control unit 81B stores the measurement results (also referred to as the determination results) from each measurement unit in the memory 82 or the storage 83.

[0097] (Action according to this embodiment) Next, an example of the operation of this embodiment will be described. Fig. 5 is a flowchart showing the flow of control processing executed by the control circuit 80.

[0098] This process is performed by the processor 81 reading and executing the control program 83A from the storage 83. This process starts when the processor 81 receives a measurement instruction from the operation unit 18, for example.

[0099] As shown in FIG. 5, in step S200, the processor 81 drives the ultrasonic measurement unit 40 to obtain the light transmittance of the paper P.

[0100] Next, in step S202, processor 81 determines whether paper P is colored paper based on light transmittance. If processor 81 determines that paper P is not colored paper, it proceeds to step S204. Note that paper P that is not colored paper includes thin paper such as transparent film and tracing paper. If processor 81 determines that paper P is colored paper, it proceeds to step S206.

[0101] Next, in step S204, the processor 81 drives at least one of the ultrasonic measurement unit 40 and the resistance measurement unit 60 to determine whether or not paper P is present in the measurement area. If the determination result indicates that paper P is not present, the processor 81 displays an error message or the like on the operation unit 18 to indicate that paper P is not present. On the other hand, if the determination result indicates that paper P is present, the processor 81 determines that paper P is not colored paper, stores this in the memory 82 or storage 83, and ends the measurement of paper P.

[0102] Next, in step S206, the processor 81 drives the color measurement unit 30 to determine the color of the paper P. Specifically, the color of the paper P is determined based on the light reflected from the paper P. The determined color information of the paper P is stored in the memory 82 or the storage 83, and the measurement of the paper P is completed.

[0103] In this embodiment, the processor 81 determines whether the paper P is a highly light-transmitting paper or whether the paper P is present in the measurement area based on the measurement results of the light transmittance and at least one of the electrical resistance and ultrasonic transmittance, and therefore can distinguish between a case where the paper P is a highly light-transmitting object and a case where the paper P is not present in the measurement area.

[0104] In addition, in this embodiment, when the processor 81 determines whether or not paper P is present in the measurement area based on the electrical resistance of the paper P, the presence or absence of paper P can be determined more accurately than when determining whether or not paper P is present in a non-contact manner.

[0105] In addition, in this embodiment, when the processor 81 determines whether the paper P is a highly light-transmitting object or whether the paper P is not present in the measurement area based on the light transmittance and electrical resistance, it can more accurately distinguish between the case where the paper P is a highly light-transmitting object and the case where the paper P is not present in the measurement area, compared to when determining the presence or absence of the paper P without contact.

[0106] In addition, in this embodiment, when the processor 81 determines whether or not a measurement object is present in the measurement area based on the ultrasonic transmittance of the paper P, the burden on the paper P can be reduced compared to when the presence or absence of the paper P is determined by contact.

[0107] In addition, in this embodiment, when the processor 81 determines whether the paper P is a highly light-transmitting object or whether the paper P is not present in the measurement area based on the light transmittance and the ultrasonic transmittance, it is possible to distinguish between the paper P being a highly light-transmitting object and the paper not being present in the measurement area while reducing the burden on the paper P, compared to when determining whether the paper P is present or not by contact.

[0108] Furthermore, in this embodiment, the color of the paper P is determined based on the wavelength and intensity of light received by the color measurement unit 30, which has a light irradiation unit 32 that emits light of multiple different wavelengths, so the device configuration can be simplified compared to a configuration in which multiple light irradiation units that emit light of different wavelengths are provided.

[0109] Furthermore, when the color measurement unit 30, ultrasonic measurement unit 40, transmitted light measurement unit 50, and resistance measurement unit 60 are provided on the transport path of the paper P as in this embodiment, it is possible to continuously distinguish between a case where the paper P is highly light-transmitting paper and a case where the paper P is not present in the measurement area.

[0110] Furthermore, in this embodiment, when the presence or absence of paper P in the measurement area based on the electrical resistance of the paper P differs from the presence or absence of paper P in the measurement area based on the transmittance of ultrasonic waves of the paper P, the processor 81 compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area and determines the priority of the electrical resistance and the ultrasonic transmittance. Therefore, in this embodiment, regardless of the measurement position of the electrical resistance and the measurement position of the ultrasonic transmittance, the presence or absence of paper P in the measurement area can be determined more accurately than if a predetermined measurement method was given priority.

[0111] Furthermore, when the processor 81 compares the measurement position of the electrical resistance in the measurement area with the measurement position of the ultrasonic transmittance, as in this embodiment, and prioritizes the measurement position located on the opposite side of the setting direction A in which the paper P is set in the setting section SR, it can more accurately determine whether or not paper P is present in the measurement area, compared to when the processor 81 compares the measurement position of the electrical resistance in the measurement area with the measurement position of the ultrasonic transmittance, and prioritizes the measurement position on the setting direction A side.

[0112] Furthermore, in this embodiment, when the control device 16 receives an image formation instruction from the operation unit 18, it receives information about the paper P from the measurement device 20. The control device 16 causes the image forming unit 14 and the transport mechanism 15 to perform an image formation operation, and controls the operations of the image forming unit 14 and the transport mechanism 15 based on the measurement value information. This improves the quality of the image formed on the paper P compared to when the user sets the color or light transmittance of the paper P before printing.

[0113] (Other embodiments) In the above-described embodiment, the control circuit 80 performs the control process as shown in Fig. 5, but the present disclosure is not limited to this configuration. For example, the control process may be performed as shown in Fig. 8.

[0114] 8, in step S300, the processor 81 drives the color measurement unit 30 to determine the color of the paper P. Specifically, the color of the paper P is determined based on the light reflected from the paper P.

[0115] Next, in step S302, processor 81 determines whether there is a possibility that paper P is transparent or that paper P is not present in the measurement area. Specifically, if the color measured by color measurement unit 30 is the same as the color of opposing surface 21A, processor 81 determines that there is a possibility that paper P is transparent or that paper P is not present in the measurement area. If processor 81 determines that there is a possibility that paper P is transparent or that paper P is not present in the measurement area, it proceeds to step S304, but if it determines that there is no possibility, it stores the color measured by color measurement unit 30 in memory 82 or storage 83 and ends the measurement of paper P.

[0116] Next, in step S304, the processor 81 drives the ultrasonic measurement unit 40 to determine the light transmittance of the paper P.

[0117] Next, in step S306, processor 81 determines whether paper P is colored paper based on light transmittance. If processor 81 determines that paper P is not colored paper, it proceeds to step S308. If processor 81 determines that paper P is colored paper, it stores the color measured by color measurement unit 30 in memory 82 or storage 83 and ends the measurement of paper P.

[0118] Next, in step S308, the processor 81 drives at least one of the ultrasonic measurement unit 40 and the resistance measurement unit 60 to determine whether or not paper P is present in the measurement area. If the determination result indicates that paper P is not present, the processor 81 displays an error message or the like on the operation unit 18 to indicate that paper P is not present. On the other hand, if the determination result indicates that paper P is present, the processor 81 determines that paper P is not colored paper, stores this result in the memory 82 or the storage 83, and ends the measurement of paper P.

[0119] In the control process shown in Figure 8 above, when the color measurement unit 30 determines that the paper P is colored paper, the processor 81 does not drive the ultrasonic measurement unit 40, the transmitted light measurement unit 50, and the resistance measurement unit 60, thereby reducing energy consumption required for driving.

[0120] In addition, the processor 81 acquires the color of the opposing surface 21A as the holding portion in advance, and when the acquired color of the opposing surface 21A corresponds to the color of the identified paper P, it can distinguish between a case where the paper P is the same color as the opposing surface 21A, a case where the paper P is an object with high light transmittance, and a case where there is no paper P in the measurement area.

[0121] In the above-described embodiment, a recording medium is used as an example of the measurement object, but this is not limiting. An example of the measurement object may be an object used for purposes other than forming an image. Furthermore, in the present embodiment, paper P is used as an example of the recording medium, but this is not limiting. An example of the recording medium may be a sheet-like recording medium other than paper P, such as a metal or resin film.

[0122] In this embodiment, the measurement device 20 includes the ultrasonic measurement unit 40 and the resistance measurement unit 60, but is not limited to this. The measurement device 20 may be configured to not include, for example, one of the ultrasonic measurement unit 40 and the resistance measurement unit 60. Furthermore, the measurement device 20 may not include the color measurement unit 30.

[0123] The present disclosure is not limited to the above-described embodiment, and various modifications, changes, and improvements are possible without departing from the spirit of the present disclosure. For example, the above-described modified examples may be appropriately combined to form a configuration.

[0124] The following additional notes are provided regarding the above-described embodiments.

[0125] (((1))) a first light-emitting unit that emits light toward the object to be measured; a first light receiving unit that receives light that has passed through the object to be measured; a measuring means for measuring at least one of an electrical resistance and an ultrasonic transmittance of the measurement object; a processor; Equipped with The processor determines whether the measurement object is an object with high light transmittance or not, or whether the measurement object exists in the measurement area, based on the intensity of the light received by the first light receiving unit and the measurement result by the measuring means. Measurement system.

[0126] (((2))) the measuring means includes a power source and a pair of electrodes that apply a voltage to the object to be measured; The processor determines whether or not the measurement object is present in the measurement area based on the electrical resistance of the measurement object. The measurement system according to (((1))).

[0127] (((3))) The processor: Based on the intensity of the light received by the first light receiving unit and the electrical resistance, it is determined whether the measurement object is an object with high light transmittance or whether the measurement object is present in the measurement area. The measurement system according to (((2))).

[0128] (((4))) The measuring means includes a transmitter that emits ultrasonic waves toward the object to be measured, and a receiver that receives ultrasonic waves that have passed through the object to be measured, The processor determines whether or not the measurement object is present in the measurement area based on the ultrasonic transmittance of the measurement object. The measurement system according to any one of (((1))) to (((3))).

[0129] (((5))) The processor: Based on the intensity of the light received by the first light receiving unit and the transmittance of the ultrasonic waves, it is determined whether the measurement object is not present in the measurement area or whether the measurement object is an object with high light transmittance. The measurement system according to (((4))).

[0130] (((6))) a second light emitting unit that emits light of a plurality of different wavelengths toward the object to be measured; a second light receiving unit that receives light reflected by the object to be measured; Equipped with The processor determines the color of the object to be measured based on the wavelength and intensity of the light received by the second light receiving unit. The measurement system according to any one of (((1))) to (((5))).

[0131] (((7))) a holder for holding the measurement object is disposed; The processor acquires the color of the holder in advance, and when the acquired color of the holder corresponds to the determined color of the measurement object, determines whether the measurement object is an object with high light transmittance or whether the measurement object is present in the measurement area based on the intensity of the light received by the first light receiving unit and the measurement result by the measurement means. The measurement system according to (((6))).

[0132] (((8))) a transport unit that transports the measurement object, The first light emitting unit, the first light receiving unit, and the measuring means are provided on a transport path of the measurement object. The measurement system according to any one of (((1))) to (((7))).

[0133] (((9))) The measuring means Power supply and A pair of electrodes that apply a voltage to the object to be measured; a transmitter that emits ultrasonic waves toward the object to be measured; a receiving unit that receives ultrasonic waves that have passed through the object to be measured; Equipped with When the presence or absence of the measurement object in the measurement area based on the electrical resistance of the measurement object differs from the presence or absence of the measurement object in the measurement area based on the ultrasonic transmittance of the measurement object, the processor compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area and determines the priority of the electrical resistance and the ultrasonic transmittance. The measurement system according to (((1))).

[0134] (((10))) a setting unit on which the sheet-shaped measurement object is set, The processor compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area, and prioritizes the measurement position located on the opposite side with respect to the setting direction in which the measurement object is set in the setting unit. The measurement system according to (((9))).

[0135] (((11))) The measurement system according to any one of (((1))) to (((10))), an image forming unit that forms an image on a recording medium as the measurement object whose color or light transmittance has been measured by the measurement system; An image forming system comprising:

[0136] The measurement system (((1))) can distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object is not present in the measurement area.

[0137] The measurement system (((2))) can determine the presence or absence of a measurement object in the measurement area with higher accuracy than when determining the presence or absence of a measurement object in a non-contact manner.

[0138] The measurement system (((3))) can more accurately distinguish between a case where the object to be measured is an object with high light transmittance and a case where the object to be measured is not present in the measurement area, compared to a case where the presence or absence of the object to be measured is determined in a non-contact manner.

[0139] The measurement system (((4))) can reduce the burden on the object to be measured compared to when determining the presence or absence of the object to be measured by contact.

[0140] The measurement system (((5))) can distinguish between a case where the object to be measured is an object with high light transmittance and a case where the object to be measured is not present in the measurement area while reducing the burden on the object to be measured.

[0141] In the measurement system (((6))), the device configuration can be simplified compared to a configuration in which a plurality of second light-emitting units that emit light of different wavelengths are provided.

[0142] The measurement system (((7))) can distinguish between cases where the object to be measured is the same color as the holder, where the object to be measured is an object with high light transmittance, and where there is no object to be measured in the measurement area.

[0143] The measurement system (((8))) can continuously distinguish between a case where the measurement object is an object with high light transmittance and a case where the measurement object is not present in the measurement area.

[0144] The measurement system (((9))) can accurately determine whether or not a measurement object is present in the measurement area, regardless of the measurement position of the electrical resistance and the measurement position of the ultrasonic transmittance, compared to systems that prioritize a predetermined measurement method.

[0145] The measurement system (((10))) compares the measurement position of the electrical resistance in the measurement area with the measurement position of the ultrasonic transmittance, and can more accurately determine whether or not a measurement object is present in the measurement area than systems that prioritize the measurement position on the set direction side.

[0146] The imaging system of (((11))) improves the quality of the image formed on the recording medium compared to when the user sets the color or light transparency of the recording medium. [Explanation of symbols]

[0147] 10 Image forming device 11 Image forming device main body 12 Media storage section 14 Image forming unit 15 Transport mechanism 16 Control device 18 Control section 20 Measuring Equipment 21 First enclosure 21A Opposite surface 22 Image forming unit 22 Second enclosure 22A Opposite surface 23 Aperture 24 Aperture 25 Aperture 26 Aperture 27 Aperture 30 Color measurement section 31 Drive circuit 32 Light irradiation unit 35 Light receiving part 36 Processing section 40 Ultrasonic measurement unit 41 Drive circuit 42 Communications Department 45 Receiving unit 46 Processing section 50 Transmitted light measurement section 51 Drive circuit 52 Light irradiation unit 55 Light receiving part 56 Processing section 60 Resistance measurement section 61 Electrical Circuits 62 terminals 63 Power supply 65 Detection circuit 66 Processing section 80 Control circuit 81 processors 81A Acquisition Department 81B Control section 82 memory 83 Storage 83A Control Program A Setting direction P paper

Claims

1. a first light-emitting unit that emits light toward the object to be measured; a first light receiving unit that receives light that has passed through the object to be measured; a measuring means for measuring at least one of an electrical resistance and an ultrasonic transmittance of the measurement object; a processor; Equipped with The processor determines whether the measurement object is an object with high light transmittance or not, or whether the measurement object exists in the measurement area, based on the intensity of the light received by the first light receiving unit and the measurement result by the measuring means. Measurement system.

2. the measuring means includes a power source and a pair of electrodes that apply a voltage to the object to be measured; The processor determines whether or not the measurement object is present in the measurement area based on the electrical resistance of the measurement object. The measurement system of claim 1 .

3. The processor: Based on the intensity of the light received by the first light receiving unit and the electrical resistance, it is determined whether the measurement object is an object with high light transmittance or whether the measurement object is present in the measurement area. The measurement system of claim 2 .

4. The measuring means includes a transmitter that emits ultrasonic waves toward the object to be measured, and a receiver that receives ultrasonic waves that have passed through the object to be measured, The processor determines whether or not the measurement object is present in the measurement area based on the ultrasonic transmittance of the measurement object. The measurement system of claim 1 .

5. The processor: Based on the intensity of the light received by the first light receiving unit and the transmittance of the ultrasonic waves, it is determined whether the measurement object is not present in the measurement area or whether the measurement object is an object with high light transmittance. The measurement system of claim 4 .

6. a second light emitting unit that emits light of a plurality of different wavelengths toward the object to be measured; a second light receiving unit that receives light reflected by the object to be measured; Equipped with The processor determines the color of the object to be measured based on the wavelength and intensity of the light received by the second light receiving unit. The measurement system of claim 1 .

7. a holder for holding the measurement object is disposed; The processor acquires the color of the holder in advance, and when the acquired color of the holder corresponds to the determined color of the measurement object, determines whether the measurement object is an object with high light transmittance or whether the measurement object is present in the measurement area based on the intensity of the light received by the first light receiving unit and the measurement result by the measurement means. The measurement system of claim 6.

8. a transport unit that transports the measurement object, The first light emitting unit, the first light receiving unit, and the measuring means are provided on a transport path of the measurement object. The measurement system of claim 1 .

9. The measuring means Power supply and A pair of electrodes that apply a voltage to the object to be measured; a transmitter that emits ultrasonic waves toward the object to be measured; a receiving unit that receives ultrasonic waves that have passed through the object to be measured; Equipped with When the presence or absence of the measurement object in the measurement area based on the electrical resistance of the measurement object differs from the presence or absence of the measurement object in the measurement area based on the ultrasonic transmittance of the measurement object, the processor compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area and determines the priority of the electrical resistance and the ultrasonic transmittance. The measurement system of claim 1 .

10. a setting unit on which the sheet-shaped measurement object is set, The processor compares the measurement position of the electrical resistance with the measurement position of the ultrasonic transmittance in the measurement area, and prioritizes the measurement position located on the opposite side with respect to the setting direction in which the measurement object is set in the setting unit. The measurement system of claim 9.

11. The measurement system according to any one of claims 1 to 10; an image forming unit that forms an image on a recording medium as the measurement object whose color or light transmittance has been measured by the measurement system; An image forming system comprising:

Images