Temperature change recording device, temperature management system, and temperature management program

Abstract

There is a need for a temperature change recording device that can record temperature changes with a simple configuration. [Solution] The temperature change recording device 1 comprises a display unit 10 that uses a thermochromic material 4 whose color changes according to the temperature, and a holding unit 11 that holds the display unit 10 in a position where it can be seen from the outside. The thermochromic material 4 is configured to change color when the temperature exceeds a preset first set temperature, and to change color when the temperature does not exceed the first set temperature.

Description

【Technical Field】 【0001】 The present invention relates to a temperature change recording device. 【Background Art】 【0002】 An example of such a temperature change recording device is disclosed in Patent Document 1 below. In the following description of the background art, the reference numerals in Patent Document 1 are cited within parentheses. 【0003】 The temperature change recording device (logger 10) of Patent Document 1 is attached to a cold storage (28) in which pharmaceuticals are stored. The cold storage (28) is transported from a warehouse (2) to a delivery location (6) by a vehicle (4). The temperature change recording device measures the temperature inside the cold storage (28) and stores the measured temperature in association with the measurement time. The measurement data thus obtained is further transmitted from the temperature change recording device to a server (14). The server (14) is configured to extract and display the time or period when the temperature inside the cold storage (28) has deviated from a predetermined temperature range when there is a record in the measurement data that the temperature inside the cold storage (28) has deviated from the predetermined temperature range. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2023-65768 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 In Patent Document 1, since a data logger is used as the temperature change recording device, it is possible to strictly manage the temperature inside the cold storage as described above. However, depending on the type and use of the article to be managed, strict temperature management may not be necessary in some cases. In such cases, it is required to enable temperature management with a simpler mechanism. 【0006】 Therefore, there is a need for a temperature change recording device that can record temperature changes with a simple configuration. [Means for solving the problem] 【0007】 The temperature change recording device relating to this disclosure is It comprises a display unit using a thermochromic material that changes color according to temperature, and a holding unit that holds the display unit in a position where it can be seen from the outside, The thermochromic material is configured to change color when the temperature exceeds a preset temperature, and to a different color when the temperature does not exceed the preset temperature. 【0008】 With this configuration, it is easy to confirm whether the temperature of the display unit using a thermochromic material has exceeded the set temperature by visually observing the change in the color of the display unit. Therefore, by attaching this temperature change recording device to, for example, an object whose temperature changes you want to monitor, you can easily manage whether or not the object has exceeded a set temperature. 【0009】 Furthermore, in light of the above, the technical features of the temperature change recording device are also applicable to temperature management systems and temperature management programs, and therefore, such systems and programs can also be subject to the rights. 【0010】 In that case, the temperature control system is: The temperature change recording device, A photographing device for taking an image of an object to which the temperature change recording device is attached, The device includes a determination device that performs image recognition of the display unit contained in the image captured by the aforementioned imaging device, and determines whether or not the object has ever exceeded the set temperature based on the color of the thermochromic substance recognized by the image recognition. 【0011】 Furthermore, in that case, the temperature control program is: A temperature change recording device is attached to an object to which an image of the object is taken by a camera, and the device captures the image of the object to which the temperature change recording device is attached, comprising: a display unit using a thermochromic material whose color changes according to temperature; a measurement unit for measuring the electrical properties of the thermochromic material; and a recording unit for recording the measurement results from the measurement unit over time. An image recognition function that performs image recognition of the display unit included in the image captured by the aforementioned shooting function, A determination function that determines whether the object has ever exceeded a predetermined set temperature based on the color of the thermochromic substance recognized by the image recognition function, The computer is provided with a reading function that, when the determination function determines that the temperature has exceeded the set temperature, causes the reading device to read the information recorded in the recording unit of the temperature change recording device. 【0012】 Further features and advantages of the temperature change recording device, temperature management system, and temperature management program will become clear from the following description of embodiments described with reference to the drawings. [Brief explanation of the drawing] 【0013】 [Figure 1] A schematic diagram showing an example of a means of transporting goods. [Figure 2] Diagram showing an overview of the temperature control system. [Figure 3] A schematic perspective view showing an item to which a temperature change recording device is attached. [Figure 4] A diagram showing the relationship between the color change of thermochromic materials and temperature. [Figure 5] A diagram showing an example of the image processing. [Figure 6] A flowchart showing an example of image capture, image recognition, judgment, and reading processes. [Modes for carrying out the invention] 【0014】 1. Embodiment Hereinafter, embodiments of a temperature change recording device, a temperature management system, and a temperature management program will be described with reference to the drawings. As shown in FIG. 1, the temperature change recording device 1, the temperature management system 100, and the temperature management program are, as an example, used for the conveying means 6 of the article W by a cold chain. In this example, the article W is a container that houses the contents. Examples of the container include a carton container and a container (including a folding container). Examples of the contents include chemicals (including pharmaceuticals) and food products that require management at low temperatures. Therefore, in the example of FIG. 1, a plurality of articles W containing the contents are transported in a state of being stored in a refrigerated container 9 (such as a reefer container). Here, the conveying means 6 is a vehicle (such as an automobile or a railway) that can transport the refrigerated container 9, and transports the refrigerated container 9 storing a plurality of articles W from the transport origin 7 to the transport destination 8. Examples of the transport origin 7 and the transport destination 8 include a warehouse for storing the contents, a store such as a supermarket or a pharmacy where the contents are sold, a hospital, a residence, and other facilities. Note that the conveying means 6 may be an airplane or the like. Also, as shown in FIG. 5, the conveying means 6 may be a conveying conveyor 32 that mounts and conveys the article W, a flying object that holds and flies the article W, or the like. 【0015】 In the present embodiment, the temperature change recording device 1 is attached to the article W. In the example of FIG. 3, the temperature change recording device 1 is attached to the side surface of the article W as a carton container. As shown in FIG. 1, when performing temperature management on a plurality of articles W, the temperature change recording device 1 is attached to each of the plurality of articles W. As shown in FIG. 2, the temperature change recording device 1 includes a display unit 10 using a thermochromic substance 4 whose color changes according to temperature, and a holding unit 11 that holds the display unit 10 at a position where it can be visually recognized from the outside. In the present embodiment, the temperature change recording device 1 further includes a measurement unit 12 that measures the electrical characteristics of the thermochromic substance 4, and a recording unit 13 that records the measurement results by the measurement unit 12 over time. Also, the temperature change recording device 1 includes a housing 15. 【0016】 In this example, as shown in Figure 2, the display unit 10, the holding unit 11, the measuring unit 12, and the recording unit 13 are arranged inside the housing 15. The housing 15 has a window 16 that allows the inside of the housing 15 to be viewed from the outside. The window 16 is formed on the side of the housing 15. The window 16 may be formed as a through hole penetrating the housing 15, or it may be formed from a transparent resin plate such as an acrylic plate. The display unit 10 is arranged along the window 16. The holding unit 11 is fixed to the side of the housing 15 so as to support the display unit 10 arranged along the window 16. When the temperature change recording device 1 is attached to the article W, the display unit 10 is arranged to face outward relative to the article W. The display unit 10 may also be fixed to the surface of the housing 15 that faces outward. In this case, the holding unit 11 becomes a member that fixes the display unit 10 to the housing 15. The display unit 10 may also be arranged on the outside of the housing 15. In this case, the holding part 11 preferably includes a string-like member that connects the display part 10 and the housing 15, as well as a holding member that functions as a card holder to hold the display part 10 so that it can be seen from the outside. In this example, the display part 10 preferably is a member coated with a thermochromic substance 4, or a member made by processing the thermochromic substance 4 into a sheet or plate, so that the color change of the display part 10 can be seen from the outside. 【0017】 As shown in Figure 4, the thermochromic material 4 is configured to change color when it exceeds a preset first set temperature A, and to change color when it does not exceed the first set temperature A. In this embodiment, a preset temperature different from the first set temperature A is set as the second set temperature B. The thermochromic material 4 is configured to change from the first color P to the second color Q when it exceeds the first set temperature A, and to change from the second color Q to the first color P when it falls below the second set temperature B. The second set temperature B is set lower than the first set temperature A. In this example, the above color change is considered a change in hue. The first set temperature A corresponds to the "set temperature". 【0018】 In this example, when the temperature of the thermochromic substance 4 rises and exceeds the first set temperature A, it changes from the first color P to the second color Q. Thereafter, even when the temperature of the thermochromic substance 4 drops and falls below the first set temperature A, it remains the second color Q until it falls below the second set temperature B. When the hue of the thermochromic substance 4 falls below the second set temperature B, it changes from the second color Q to the first color P. Furthermore, when the temperature of the thermochromic substance 4 rises again and exceeds the first set temperature A, it changes from the first color P to the second color Q, and when the temperature drops again and falls below the second set temperature B, it changes from the second color Q to the original color (the first color P). Thus, the color change of the thermochromic substance 4 used in the display unit 10 has reversible chemical properties. As described above, regardless of whether the article W is transported by a cold chain, it is preferable that the first set temperature A and the second set temperature B are set according to the properties of the contained material. 【0019】 Examples of such a thermochromic substance 4 include chemical substances such as a copper-N,N-diethylethylenediamine complex, which are used according to the set temperatures (the first set temperature A and the second set temperature B). Also, by adding an additive to such a substance, for example, it is preferable that the temperature values of the first set temperature A and the second set temperature B can be appropriately changed. Also, regarding the color change between the first color P and the second color Q, it is not limited to only a change in hue, and there may be at least one change in hue, chroma, and lightness. Note that the thermochromic substance 4 may be implemented as a liquid crystal material in the display unit 10. In the present embodiment, the temperature change recording device 1 is configured such that the color of the display unit 10 changes according to the change in the temperature of the portion where the display unit 10 is attached. Therefore, whether the first set temperature A has been exceeded or not is recorded as a change in the color of the display unit 10 (the color of the thermochromic substance 4). 【0020】 In this embodiment, the thermochromic material 4 is configured to change its electrical properties in response to temperature. The molecular motion of the thermochromic material 4 changes according to the temperature value, and this can cause its conductivity to change according to temperature. In this example, the measurement unit 12 is configured to measure the conductivity of the thermochromic material 4 used in the display unit 10. The measurement unit 12 includes a conductivity measurement circuit 12a connected to the display unit 10. The recording unit 13 (here, memory 13a) is configured to record at least one of the measurement date and time information indicating the date and time the measurement was taken by the measurement unit 12, and the measurement position information indicating the position of the holding unit 11 when the measurement was taken by the measurement unit 12, in association with the measurement result from the measurement unit 12. In this example, the temperature change recording device 1 further includes a position time module 14. The position time module 14 has both GPS functionality and clock functionality. In the example of Figure 1, the position of the holding unit 11 (here, the item W) can be associated with the time. Therefore, the position of the vehicle transporting the item W can be known in relation to the time. As shown in Figure 2, the position and time module 14 is connected to the memory 13a and the conductivity measurement circuit 12a. The temperature change recording device 1 is equipped with a battery BT as a power supply. Power supplied from the battery BT allows the conductivity of the thermochromic material (thermochromic substance 4) mounted on the display unit 10 to be measured, and the measurement results, which are measurement information D associated with the position and time (date and time), can be recorded in the memory 13a. In the memory 13a, the measurement information D is recorded at a predetermined time interval. The memory 13a may also be configured to record the measurement information D in response to changes in conductivity exceeding a predetermined range. In this example, the temperature change recording device 1 is configured to communicate with the control unit H of the determination device 3 via the reading device 18 described later. The means of communication with the control unit H may be wireless communication or wired communication. 【0021】 In this example, multiple articles W, each equipped with a temperature change recording device 1, are transported from a source 7 to a destination 8 by a transport means 6. The internal temperature of the refrigerated container 9 where these articles W are stored is set to a third set temperature C. The third set temperature C is set according to the type of contents stored in the refrigerated container 9 (the contents contained in the articles W). The third set temperature C is set to be higher than the second set temperature B and lower than the first set temperature A. Preferably, the third set temperature C is set to the optimal temperature for maintaining the quality of the contents. Preferably, the first set temperature A is set to the highest temperature that can maintain the quality of the contents. The second set temperature B may be set, for example, to the lowest temperature that can maintain the quality of the contents. 【0022】 For example, when an item W in a refrigerated container 9 is transferred from a transport means 6 (e.g., a vehicle) to a transport destination 8 (e.g., a hospital), it is possible to determine whether the item W has ever exceeded the first set temperature A by visually inspecting the display unit 10 of the temperature change recording device 1 of the item W being removed from the refrigerated container 9. Specifically, if the display unit 10 changes to the second color Q, it can be determined that the item W has exceeded the first set temperature A. Even if the temperature of the item W is above the second set temperature B and below the first set temperature A, as shown in Figure 4, if it has exceeded the first set temperature A once, the display unit 10 will remain in the second color Q. Therefore, even if the actual temperature at the time the display unit 10 is visually inspected is below the first set temperature A, it is possible to determine whether the item W has ever exceeded the first set temperature A before. Thus, the thermochromic material 4 of this embodiment is reversibly configured such that, even if the temperature at which the color (in this case, hue) of the display unit 10 is confirmed (visually observed) is the same, the color will differ depending on whether the temperature has exceeded the first set temperature A or has never exceeded the first set temperature A. 【0023】 As described above, the temperature management system 100 is a system that can manage the temperature of, for example, an article W stored in a refrigerated container 9. In this embodiment, as shown in Figure 2, the temperature management system 100 includes a temperature change recording device 1, an imaging device 2, and a determination device 3. The temperature management system 100 also includes a reading device 18. The imaging device 2 takes an image of the object 5 to which the temperature change recording device 1 is attached. The determination device 3 performs image recognition of the display unit 10 included in the image taken by the imaging device 2, and determines whether the object 5 has ever exceeded the first set temperature A based on the color of the thermochromic substance 4 recognized by image recognition. The reading device 18 reads the information recorded in the recording unit 13 of the temperature change recording device 1. In this example, as described above, the temperature change recording device 1 is attached to the article W (Figure 3). Therefore, the object 5 is the article W. Alternatively, the temperature change recording device 1 may be attached to the contents themselves. In that case, the object 5 is the contents. 【0024】 As shown in Figure 5, when a conveyor belt 32 is used as the transport means 6, it is preferable that the imaging device 2 is positioned to correspond to the conveyor belt 32. In the illustrated example, the imaging device 2 is positioned to the side of the conveyor belt 32 and photographs the sides of multiple items W being transported. Although not shown in Figure 5, the conveyor belt 32 is preferably used when transporting items W from a source 7 to a destination 8 within a facility such as a warehouse or airport. It is also preferable to use the conveyor belt 32 when transporting items W that have been unloaded from a vehicle into a facility. 【0025】 In this example, the temperature management system 100 further includes an output device 21 that outputs the determination result from the determination device 3. Here, the determination device 3 includes, for example, a processor such as a microcomputer, peripheral circuits such as memory, etc. The function of the determination device 3 is realized through the cooperation of this hardware and a program executed on the processor such as a computer. Here, the determination device 3, the reading device 18, and the output device 21 are personal computers. In this example, the determination device 3 includes a determination unit 3a and a control unit H. The control unit H controls the imaging device 2, the output device 21, and the temperature change recording device 1. Here, the control unit H is configured to communicate with the temperature change recording device 1. The imaging device 2 takes an image of each item W being transported on the conveyor belt 32 in the order of transport. The image taken by the imaging device 2 includes at least the display unit 10 of the temperature change recording device 1 for each item W. The captured image is sent to the determination device 3 as imaging information. The determination device 3 determines whether the item W has ever exceeded the first set temperature A based on the color (in this case, hue) of the display unit 10. Naturally, the photographing device 2 may be positioned to photograph the item W on the conveyor belt 32 from above. 【0026】 In this example, an automated guided vehicle (AGV) may be used instead of the conveyor belt 32 as the transport means 6. In this case, the imaging device 2 may be positioned corresponding to the transport path of the AGV. The imaging device 2 photographs the items W held by each AGV traveling along the transport path, including the display unit 10. Furthermore, if a vehicle (such as an automobile or train) is used as the transport means 6, the imaging device 2 may be positioned to photograph the display unit 10 of the items W being unloaded from the vehicle by human hands, a forklift, a robot, etc. 【0027】 In this embodiment, the temperature management program enables the computer to implement a shooting function, an image recognition function, a determination function, and a reading function. This temperature management program is executed by the control unit H. The shooting function causes the shooting device 2 to capture an image of the object 5 to which the temperature change recording device 1 is attached. The image recognition function performs image recognition of the display unit 10 included in the image captured by the shooting function. The determination function determines, based on the color of the thermochromic substance 4 recognized by the image recognition function, whether or not the object 5 has ever exceeded a predetermined first set temperature A. The reading function, when the determination function determines that the first set temperature A has been exceeded, causes the reading device 18 to read the information recorded in the recording unit 13 of the temperature change recording device 1. 【0028】 As shown in Figure 6, the control unit H executes an imaging process (S01) to realize the imaging function, an image recognition process (S02) to realize the image recognition function, a determination process (S03) to realize the determination function, and a reading process (S04) to realize the reading function. The control unit H controls the imaging device 2 to capture an image of the object 5 (in this case, article W) so that the display unit 10 is included. The image captured by the imaging device 2 is sent to the determination device 3 as imaging information as described above. The determination device 3 (in this case, the determination unit 3a) performs image recognition of the image received from the imaging device 2. Here, the determination unit 3a recognizes the image of the display unit 10 in the image recognition. The determination unit 3a then determines whether the color of the display unit 10 is the second color Q (S03). If the determination unit 3a determines that the color of the display unit 10 is the second color Q (S03: Yes), the control unit H executes the reading process, assuming that the article W has previously exceeded a predetermined first set temperature A. During the read operation, measurement information D is transmitted from the recording unit 13 to the determination device 3. The measurement information D includes the change over time in the conductivity of the thermochromic material 4 on the display unit 10. The measurement information D also includes location information indicating the position of the temperature change recording device 1 (in this case, the position of item W) detected by the GPS function. Thus, the control unit H executes the read operation only when the color of the display unit 10 is the second color Q. 【0029】 Furthermore, the control unit H performs output processing to output the measurement information D read from the recording unit 13 to the output device 21 (in this case, the monitor). This allows the measurement information D to be displayed on the monitor of a personal computer. In addition, as described above, the measurement information D includes the change in conductivity of the thermochromic material 4 over time and position information, so it is possible to know the time when the thermochromic material 4 exceeded the first set temperature A, the period during which it exceeded the first set temperature A, and the position of the item W when it exceeded the first set temperature A. Note that the measurement information D may include all changes in the conductivity of the thermochromic material 4 over time, or it may include changes over time after it shows a predetermined change in conductivity. Note that if the determination device 3 determines that the color of the display unit 10 is not the second color Q (S03: No), it does not perform the read processing because the item W has never exceeded the predetermined first set temperature A before. This eliminates the need to read the measurement information D, thus reducing the verification process by the operator. 【0030】 The control unit H may output a signal indicating error information if it determines that the color of the display unit 10 is the second color Q. For example, the control unit H may have the output device 21 display the type of contents (e.g., lot number, etc.) or the management number of item W as error information. The control unit H may also notify the error information with sound, light, etc. Furthermore, even if the control unit H determines that the color of the display unit 10 is not the second color Q, i.e., the first color P, it may output a signal indicating error information in the same manner as above, if the behavior of the electrical characteristics included in the measurement information D indicates that it is below the second set temperature B. 【0031】 2. Other Embodiments (1) In the above embodiment, the temperature change recording device 1 was described as being attached to the article W as an example, but it is not limited to this. The temperature change recording device 1 may also be attached to the refrigerated container 9. In this case, it is preferable that the imaging device 2 takes photographs of each of the multiple refrigerated containers 9 to be transported, so as to include at least the display unit 10. For example, if the transport means 6 is a railway, ship, airplane, or multiple automobiles that transport multiple refrigerated containers 9, the imaging device 2 may take photographs at the timing when the multiple refrigerated containers 9 are sequentially moved from these transport means 6 at the destination 8. 【0032】 (2) In the above embodiment, the temperature change recording device 1 was described as comprising a measuring unit 12 for measuring the electrical properties of the thermochromic material 4 and a recording unit 13 for recording the measurement results from the measuring unit 12 over time, but it is not limited to this configuration. The temperature change recording device 1 may be configured without the measuring unit 12 and the recording unit 13 as described above. The temperature change recording device 1 may also be equipped with a temperature detection function that detects the temperature of the thermochromic material 4 based on the measurement results from the measuring unit 12. Such a temperature detection function may be provided in the determination device 3. The temperature detection function may also be configured to detect the temperature of the thermochromic material 4 when the electrical characteristics exceed a predetermined range. 【0033】 (3) In the above embodiment, the recording unit 13 was described as having a configuration in which both measurement date and time information indicating the date and time the measurement was performed by the measurement unit 12, and measurement position information indicating the position of the holding unit 11 when the measurement was performed by the measurement unit 12 are recorded in association with the measurement results of the measurement unit 12, but the system is not limited to this configuration. The recording unit 13 can also be configured to record only one of the measurement date and time information or the measurement position information in association with the measurement results of the measurement unit 12. In addition, the recording unit 13 may also record the type of contents contained in the article W to which the temperature change recording device 1 is attached, temperature characteristics, etc. 【0034】 (4) In the above embodiment, the thermochromic material 4 is configured to change from the first color P to the second color Q when the temperature exceeds the first set temperature A, and to change from the second color Q to the first color P when the temperature falls below the second set temperature B, and the second set temperature B is set lower than the first set temperature A, but the embodiment is not limited to this. The thermochromic material 4 may have an irreversible chemical property in which it changes from the first color P to the second color Q when the temperature exceeds the first set temperature A, and thereafter remains the second color Q regardless of the temperature value. 【0035】 (5) In the above embodiment, the determination device 3 performs image recognition of the display unit 10 included in the image captured by the imaging device 2, and determines whether the object 5 has ever exceeded the first set temperature A based on the color of the thermochromic material 4 recognized by the image recognition. However, the device is not limited to this configuration. The determination device 3 may further determine, for example, whether the thermochromic material 4 has ever exceeded a set temperature higher than the first set temperature A, or whether it has ever exceeded a set temperature lower than the first set temperature A. In that case, it is preferable that the thermochromic material 4 used in the display unit 10 has the characteristic of changing color at each of the multiple set temperatures. 【0036】 (6) The configurations disclosed in each of the embodiments described above can be applied in combination with configurations disclosed in other embodiments, as long as no inconsistencies arise. With regard to other configurations, the embodiments disclosed herein are merely illustrative in all respects. Therefore, various modifications can be made as appropriate without departing from the spirit of this disclosure. 【0037】 3. Summary of the above embodiments The following describes the temperature change recording device (1), temperature management system (100), and temperature management program described above. 【0038】 The temperature change recording device (1) relating to this disclosure is The device comprises a display unit (10) using a thermochromic material (4) whose color changes according to temperature, and a holding unit (11) that holds the display unit (10) in a position where it can be seen from the outside. The thermochromic material (4) is configured such that when it exceeds a preset first set temperature (A), it takes on a different color than when it does not exceed the first set temperature (A). 【0039】 With this configuration, it is possible to easily confirm whether the temperature of the display unit (10) using the thermochromic material (4) has exceeded the first set temperature (A) by visually observing the change in color of the display unit (10). Therefore, by attaching this temperature change recording device (1) to, for example, an object (5) whose temperature changes you want to manage, you can easily manage whether or not the object (5) has exceeded a first set temperature (A). 【0040】 The system comprises a measuring unit (12) for measuring the electrical properties of the thermochromic material (4), and a recording unit (13) for recording the measurement results from the measuring unit (12) over time. The thermochromic material (4) is configured such that its electrical properties change depending on the temperature. 【0041】 With this configuration, the temperature change of the display unit (10) can be checked over time by referring to the measurement results recorded in the recording unit (13). Therefore, if you want to check the temperature change of the display unit (10) in detail, you can do so appropriately. 【0042】 The recording unit (13) is configured to record at least one of the following: measurement date and time information indicating the date and time when the measurement was performed by the measurement unit (12), and measurement position information indicating the position of the holding unit (11) when the measurement was performed by the measurement unit (12), in association with the measurement result from the measurement unit (12). 【0043】 With this configuration, the date and time when a temperature change occurred in the display unit (10), and at least one of the locations where the temperature change occurred, can be checked as needed. 【0044】 A preset temperature different from the first set temperature (A) is set as the second set temperature (B). The thermochromic material (4) is When the temperature exceeds the first set temperature (A), the color changes from the first color to the second color. The device is configured to change from the second color to the first color when the temperature falls below the second set temperature (B). The second set temperature (B) is set lower than the first set temperature (A). 【0045】 In this configuration, since the second set temperature (B) is set lower than the first set temperature (A), even if the thermochromic material (4) changes from the first color to the second color after exceeding the first set temperature (A), and then falls below the first set temperature (A), it will not return to its original color (first color) as long as the temperature is above the second set temperature (B). Therefore, for example, by setting the normal control temperature to be below the first set temperature (A) and above the second set temperature (B), it is possible to easily check later whether the display unit (10) has exceeded the first set temperature (A) at any point by visually checking the color of the display unit (10). 【0046】 A temperature control system (100), The temperature change recording device (1) and, A photographing device (2) that takes an image of the object (5) to which the temperature change recording device (1) is attached, The device includes a determination device that performs image recognition of the display unit (10) included in the image captured by the imaging device (2), and determines whether the object has ever exceeded the first set temperature (A) based on the color of the thermochromic substance (4) recognized by the image recognition. 【0047】 With this configuration, the temperature of the object (5) can be managed by attaching the temperature change recording device (1) to the object (5). Furthermore, by using the imaging device (2) and the determination device, it is possible to determine whether the object (5) has ever exceeded a set temperature based on the image recognition results, thereby reducing the effort required for temperature management of the object (5). 【0048】 It is a temperature control program, A temperature change recording device (1) is attached to an object (5) to which an image of the object (5) is taken by a camera, and the device takes an image of the object (5) to which the device takes an image of the object, and the device has an image taking an image of the object, which is equipped with a temperature change recording device (1) comprising a display unit (10) using a thermochromic material (4) whose color changes according to temperature, a measurement unit (12) for measuring the electrical properties of the thermochromic material (4), and a recording unit (13) for recording the measurement results from the measurement unit (12) over time. An image recognition function that performs image recognition of the display unit (10) included in the image captured by the aforementioned shooting function, A determination function that determines whether the object (5) has ever exceeded a predetermined first set temperature (A) based on the color of the thermochromic substance (4) recognized by the image recognition function, The computer is provided with a reading function that, when the determination function determines that the temperature has exceeded the first set temperature (A), causes the reading device (18) to read the information recorded in the recording unit (13) of the temperature change recording device (1). 【0049】 With this configuration, by having the computer implement the shooting function, image recognition function, and judgment function, it is possible to easily determine whether or not the object (5) has ever exceeded the first set temperature (A). Furthermore, by having the computer implement the reading function, if the object (5) has exceeded the first set temperature (A), it is possible to easily check the temperature change of the object (5) over time. Furthermore, with this configuration, if the object (5) has never exceeded the first set temperature (A), the reading function is not implemented, thus reducing the processing load. [Industrial applicability] 【0050】 The technology disclosed herein can be used in temperature change recording devices, temperature management systems, and temperature management programs. [Explanation of symbols] 【0051】 1: Temperature change recording device, 2: Imaging device, 3: Judgment device, 4: Thermochromic material, 5: Object, 10: Display unit, 11: Holding unit, 12: Measurement unit, 13: Recording unit, 100: Temperature management system, A: First set temperature (set temperature), B: Second set temperature, P: First color, Q: Second color

Claims

[Claim 1] It comprises a display unit using a thermochromic material that changes color according to temperature, and a holding unit that holds the display unit in a position where it can be seen from the outside, A temperature change recording device wherein the thermochromic material is configured to change color when the temperature exceeds a preset temperature, and to change color when the temperature does not exceed the preset temperature. [Claim 2] The system comprises a measuring unit for measuring the electrical properties of the thermochromic material, and a recording unit for recording the measurement results from the measuring unit over time. The temperature change recording device according to claim 1, wherein the thermochromic material is configured to change its electrical properties in response to temperature. [Claim 3] The temperature change recording device according to claim 2, wherein at least one of measurement date and time information indicating the date and time when the measurement by the measurement unit was performed, and measurement position information indicating the position of the holding unit when the measurement by the measurement unit was performed, is recorded in the recording unit in association with the measurement result by the measurement unit. [Claim 4] The aforementioned set temperature is designated as the first set temperature, and a preset temperature different from the first set temperature is designated as the second set temperature. The aforementioned thermochromic material is When the temperature exceeds the first set temperature, the color changes from the first color to the second color. It is configured to change from the second color to the first color when the temperature falls below the second set temperature. The temperature change recording device according to claim 1, wherein the second set temperature is set lower than the first set temperature. [Claim 5] A temperature change recording device according to any one of claims 1 to 4, A photographing device for taking an image of an object to which the temperature change recording device is attached, A temperature management system comprising: an image recognition device that performs image recognition of the display unit contained in the image captured by the aforementioned imaging device, and determines whether or not the object has ever exceeded the set temperature based on the color of the thermochromic substance recognized by the image recognition. [Claim 6] A temperature change recording device is attached to an object to which an image of the object is taken by a camera, and the device captures the image of the object to which the temperature change recording device is attached, comprising: a display unit using a thermochromic material whose color changes according to temperature; a measurement unit for measuring the electrical properties of the thermochromic material; and a recording unit for recording the measurement results from the measurement unit over time. An image recognition function that performs image recognition of the display unit included in the image captured by the aforementioned shooting function, A determination function that determines whether the object has ever exceeded a predetermined set temperature based on the color of the thermochromic substance recognized by the image recognition function, A temperature management program for a computer to implement a reading function that causes a reading device to read information recorded in the recording unit of the temperature change recording device when the judgment function determines that the temperature has exceeded the set temperature.

Images