JP6031496B2 - Temperature measuring apparatus and temperature measuring method - Google Patents

Description

  The present invention relates to a temperature measuring device and a temperature measuring method.

  When performing various operations using a member that generates heat, the temperature of the member is measured. For example, in order to properly use a soldering iron, a temperature measuring device has been developed. As an example, the temperature measurement device disclosed in Patent Document 1 includes a measurement unit. The measurement unit includes a temperature measurement unit. A heating member such as a soldering iron tip or a suction tip of a solder suction device is pressed against the temperature measuring unit. The temperature measuring unit generates a thermoelectromotive force based on the heat of the heat generating member. The measurement unit calculates the temperature of the heat generating member based on the thermoelectromotive force.

  By the way, the temperature measuring unit receives a load from a high-temperature heating member. Therefore, the lifetime of the temperature measuring unit is short. In order to evaluate the lifetime of the temperature measuring unit, for example, a technique disclosed in Patent Document 2 is known. In this technology, when the measurement unit detects a temperature above a certain level, it measures the time during which the temperature is detected, calculates an evaluation value for determining the life, and based on the calculated evaluation value The life of the temperature sensor is determined. Further, in order to increase the accuracy of the evaluation value, the evaluation value is set to be large in proportion to the detected temperature and time, and is used for determining the life.

JP 2009-166062 A JP 2013-148370 A

  According to the configuration of Patent Document 2, it is possible to determine the lifetime of the temperature measuring unit through the temperature detected from the temperature measuring unit.

  However, in the configuration of Patent Document 2, since the lifetime is evaluated solely based on the temperature and time, the actual number of temperature measurements cannot always be counted. In addition, when the heat generating member is a tip or the like, molten solder adheres to the temperature measuring portion even after the tip is separated from the temperature measuring portion. Therefore, it is not always easy to determine whether or not the heat generating member continues to contact the temperature measuring unit.

  The present invention has been made in view of the above-described problems, and the temperature of the heat generating member is measured only when the heat generating member at the time of heat generation is in contact with the temperature measuring portion as expected, thereby having high accuracy. It is an object of the present invention to provide a temperature measuring apparatus and a temperature measuring method capable of realizing life evaluation or temperature measurement.

  In order to solve the above problems, the present invention includes a temperature measuring unit that contacts a heat generating member that melts solder, and a measuring unit that measures the temperature of the heat generating member via the temperature measuring unit, and the measuring unit includes An integration unit that integrates a count value corresponding to the number of times of temperature measurement of the heating member based on the measured temperature, and the integration unit increases the temperature of the measurement temperature that has increased per unit time set in advance A temperature measuring device that integrates the count value when the value is equal to or higher than a preset temperature rise determination value and the measured temperature has reached or exceeded a preset integrated temperature. is there. In another aspect, the present invention provides a temperature measurement method for measuring the temperature of a heat generating member that melts solder with a temperature measurement unit of a temperature measurement device, based on the measured temperature measured by the temperature measurement unit, An integration step of integrating a count value corresponding to the number of times of temperature measurement of the heat generating member, wherein the integration step is a temperature rise determination in which a temperature increase value of the measured temperature that has increased per unit time set in advance is set in advance In the temperature measurement method, the count value is integrated when the measured temperature reaches or exceeds a preset integrated temperature.

  In these aspects, the temperature rise value of the measured temperature that has risen per unit time that is set in advance is equal to or higher than a preset temperature rise determination value, and the measured temperature reaches or exceeds the preset integrated temperature. Since the count value is integrated, the life of the temperature measuring unit can be evaluated. Here, when integrating the count value, even if the temperature measured by the measurement unit is equal to or higher than the integrated temperature, when the temperature increased per unit time set in advance is less than the predetermined temperature rise determination value, The count value is not accumulated. This is to eliminate the influence of so-called supercooling. Supercooling (or recuperation) is a temperature rise phenomenon that can occur after the heating member is separated from the temperature measuring section. When the temperature measured by this phenomenon is equal to or higher than the integrated temperature, if the temperature is measured assuming that the heating member and the temperature measuring unit are in contact, the life evaluation of the temperature measuring unit is adversely affected. That is, the estimated lifetime is shorter than the actual lifetime. On the other hand, the temperature rise per unit time due to supercooling can be specified by experiments or the like. Therefore, in this aspect, even if the temperature measured by the measurement unit is equal to or higher than the integrated temperature, the temperature that has risen per unit time that is set in advance, that is, the temperature rise value is less than the preset temperature increase determination value. In such a case, it is determined that the heat effect is due to so-called supercooling, and no integration is performed. As a result, it is possible to accurately grasp the actual number of temperature measurements while avoiding the thermal effects of supercooling.

  In the temperature measuring device according to a preferred aspect, the integrating unit integrates the count value every time a preset duration elapses after the measured temperature reaches the integrated temperature or more. In the temperature measuring method according to a preferred aspect, the integrating step integrates the count value every time a preset duration elapses after the measured temperature reaches the integrated temperature or more.

  In these modes, when the heat generating member that is generating heat continues to contact the temperature measuring unit, it is determined that the temperature measuring unit is under load, and the count value is integrated every time the duration time elapses. Can continue. Therefore, this integration makes it possible to more accurately evaluate the lifetime of the temperature measuring unit.

  In a preferred embodiment of the temperature measuring device, the temperature measuring device further includes a duration measuring unit that measures the duration, and the duration measuring unit drops per unit time set in advance when the duration is being measured. When the temperature drop value of the measured temperature is equal to or higher than a predetermined temperature drop determination value, the measurement of the duration time is reset and remeasured. The temperature measuring method according to a preferred aspect further includes a duration measuring step for measuring the duration, wherein the duration measuring step is performed per unit time set in advance when the duration is measured. When the temperature drop value of the measured temperature that has dropped is equal to or higher than a preset temperature drop determination value, the measurement of the duration is reset and remeasured.

  In these modes, even when the temperature measured by the measurement unit is equal to or higher than the integrated temperature, if the temperature drop value is equal to or higher than the temperature decrease determination value, the measurement of the duration time is reset and the timing for integrating the count value is delayed. Can do. Therefore, even when the temperature measured by the measurement unit during the measurement of the duration is equal to or higher than the integrated temperature, the count value can be prevented from being integrated when the heating member has already moved away from the temperature measurement unit. Lifetime can be accurately evaluated. As a result, there is no possibility of extra accumulation of count values, and more precise count value accumulation can be executed.

  In a preferred embodiment of the temperature measuring device, when the temperature rise value is less than the temperature rise determination value, when the measured temperature is equal to or higher than the integrated temperature, the supercooling is performed from the time when the measured temperature reaches the integrated temperature. A high temperature duration measuring unit that measures a high temperature duration time until the temperature increased by the temperature falls again to the integrated temperature, and the integration unit is configured to measure the measured temperature when the high temperature duration time has elapsed. In the above case, the count value is integrated at the elapse of the high temperature elapsed time. Further, in a preferred embodiment of the temperature measurement method, when the temperature rise value is less than the temperature rise determination value, when the measured temperature is equal to or higher than the integrated temperature, from the time when the measured temperature reaches the integrated temperature, It further includes a high temperature duration measurement step for measuring a high temperature duration time until the temperature raised by the supercooling falls again to the integrated temperature, and the integration step is performed when the high temperature duration time elapses. When the temperature is equal to or higher than the integrated temperature, the count value is integrated when the high temperature elapsed time has elapsed.

  In these aspects, even when the temperature rise value of the measured temperature does not reach the predetermined temperature rise determination value for some reason, when the heating member in contact with the temperature measuring unit is in a predetermined high temperature state, The count values are added up assuming that the temperature measuring section is under considerable load. Here, when the number of times is simply accumulated based only on the fact that the measured temperature has reached the accumulated temperature, the count value is accumulated even when the temperature rises due to so-called supercooling, which is not preferable. Therefore, in this aspect, a predetermined high temperature duration time is set, and the count value is integrated when the measured temperature is equal to or higher than the integrated temperature even after the high temperature duration time has elapsed. As a result, there is no possibility of extra accumulation of the number of temperature measurements based on the temperature rise caused by overcooling, while more precise count value accumulation can be executed.

  In a preferred embodiment of the temperature measurement device, based on the maximum value of the detected value detected by the measurement unit within a preset time, a measurement temperature specifying unit that specifies the temperature related to the maximum value as the measurement temperature; and After the measurement temperature specifying unit specifies the measurement temperature, an inspection time measurement unit that measures a preset time interval as an inspection time, and a detection value detected by the measurement unit during the measurement of the inspection time A temperature difference calculating unit that calculates a detected temperature difference by comparing with the measured temperature specified by the measured temperature specifying unit, wherein the detected temperature difference calculated by the temperature difference calculating unit is set in advance; If the determination value is equal to or greater than the determination value, the inspection time is reset, and the measurement temperature specifying unit specifies the maximum value of the detected value detected within the inspection time by the reset inspection time again. Moreover, in the temperature measurement method of a preferred aspect, based on the maximum value of the detected value detected within a preset time, a measurement temperature specifying step for specifying the temperature related to the maximum value as the measurement temperature, and the measurement temperature After specifying the inspection time measurement step for measuring a preset time interval as the inspection time, and the detected value detected during the measurement of the inspection time and the measurement temperature specified in the measurement temperature specification step And a temperature difference calculating step for calculating a detected temperature difference by comparing the detected temperature difference with each other, and when the detected temperature difference calculated in the temperature difference calculating step is equal to or greater than a first determination value set in advance, It is configured to reset the time and specify the maximum value of the detected value detected within the inspection time in the measurement temperature specification at the inspection time reset again. To have.

  In these aspects, when the actual temperature change during measurement is large, the re-counting process is performed, thereby providing a function of specifying a stable detection value as the measurement temperature.

  The temperature measuring device according to a preferred aspect further includes an error determination unit that performs error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a preset second determination value. The temperature measurement method according to a preferred aspect further includes an error determination step of performing an error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a preset second determination value. .

  According to these aspects, when determining the suitability of the temperature of the heat generating member based on the measured temperature specified by the measured temperature specifying unit, when a temperature change occurs at a predetermined level after the measured temperature is determined. Can perform error determination on the assumption that camera shake or the like has occurred. In this regard, in the process of inspecting the temperature of the heat generating member, it is necessary to prevent the detection value from varying due to camera shake or the like. As a countermeasure, there is a case where a process of specifying the highest temperature among the temperatures detected within a predetermined time as a measurement temperature that becomes a measurement value is executed. In such a case, if the heat generating member is involuntarily separated from the temperature measuring unit within the predetermined time, a temperature different from the actual temperature may be specified as the measured temperature. For example, if the heat generating member has moved away from the temperature measuring unit in the middle of temperature measurement, if the detected temperature is within a predetermined set temperature range, the measured temperature specifying unit sets the maximum value of the detected temperature. It will be set as the measurement temperature. However, in that case, since the temperature lower than the actual temperature becomes the inspection object as the measurement temperature, the inspection result becomes inappropriate. On the other hand, in this aspect, when a temperature change occurs at a predetermined level after the measurement temperature specifying unit specifies the measurement temperature, this is detected and error determination is executed. Therefore, in the said aspect, when a measurement temperature specific | specification part cannot identify suitable temperature for some reason, it can determine with a test | inspection defect with high precision.

  Another aspect of the present invention includes a temperature measuring unit that contacts a heat generating member that melts solder, a measuring unit that measures the temperature of the heat generating member, and a detection value detected by the measuring unit within a preset time. Based on the maximum value, a measurement temperature specifying unit that specifies the temperature related to the maximum value as the measurement temperature, and after the measurement temperature specifying unit specifies the measurement temperature, the preset time interval is measured as the inspection time. A temperature difference for calculating a detected temperature difference by comparing the detected value detected by the measuring unit and the measured temperature specified by the measured temperature specifying unit during the measurement of the inspection time. A calculation unit, and if the detected temperature difference calculated by the temperature difference calculation unit is greater than or equal to a preset first determination value, the inspection time is reset, and the measurement is performed at the reset inspection time again. Temperature specific part at the time of the inspection It is a temperature measuring device according to claim that is configured to identify the maximum value of the detected value detected within. According to still another aspect of the present invention, there is provided a temperature measurement method for measuring the temperature of a heat generating member that melts solder with a temperature measurement unit of a temperature measurement device, and the maximum detected value detected within a preset time period. Based on the value, a measurement temperature specifying step for specifying the temperature related to the maximum value as the measurement temperature, and an inspection time measurement step for measuring a preset time interval as the inspection time after specifying the measurement temperature, A temperature difference calculating step of calculating a detected temperature difference by comparing the detected value detected during measurement of the inspection time with the measured temperature specified in the measured temperature specifying step, and the temperature difference If the detected temperature difference calculated in the calculation step is greater than or equal to a first determination value set in advance, the inspection time is reset and the measurement time is reset at the reset inspection time. It is a temperature measuring method according to claim being configured to identify the maximum value of the detection value detected in the inspection time at a temperature specific.

  According to these other aspects, when the actual temperature change during measurement is large, a function of specifying a stable detection value as the measurement temperature is performed by executing the re-count process.

  The temperature measurement device according to another aspect may further include an error determination unit that performs error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a preset second determination value. ing. The temperature measurement method according to another aspect may further include an error determination step of performing an error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a preset second determination value. ing.

  According to these other aspects, when determining the suitability of the temperature of the heat generating member based on the measured temperature specified by the measured temperature specifying unit, when the temperature change occurs at a predetermined level after the measured temperature is determined Therefore, it is possible to execute error determination on the assumption that camera shake or the like has occurred.

  As described above, according to the present invention, the temperature of the heat-generating member is measured only when the heated tip is in contact with the temperature measuring section as expected, and thus a highly accurate life evaluation or There is a remarkable effect that temperature measurement can be realized.

  Further features, objects, configurations, and advantages of the present invention will be readily understood from the following detailed description that should be read in conjunction with the accompanying drawings.

It is a perspective view of the temperature measuring device concerning one embodiment of the present invention. It is a block diagram which shows schematic structure of FIG. It is a block diagram which shows the structure of each element implement | achieved by the control unit of FIG. It is a timing chart which shows the characteristic when the soldering iron using lead-free solder is measured. It is a timing chart of this embodiment which shows a measurement characteristic for avoiding overcooling, when measuring a soldering iron using lead-free solder as a heat generating member. It is a timing chart of this embodiment which shows a measurement characteristic when a heating member is in contact with a temperature measuring part for a long time when measuring the heating member. It is a timing chart which shows the measurement characteristic of this embodiment when a exothermic member leaves during measurement of continuation time, when measuring the exothermic member. 5 is a timing chart showing measurement characteristics of the present embodiment when a high temperature state equal to or higher than an integrated temperature continues after the measurement temperature slowly rises when the heat generating member is measured. 6 is a timing chart showing measurement characteristics of the present embodiment when normal measurement is possible when the heat generating member is measured in the recording mode of the present embodiment. 6 is a timing chart showing measurement characteristics of the present embodiment when an error occurs when the heat generating member is measured in the recording mode of the present embodiment. It is a flowchart concerning this embodiment. It is a flowchart which shows the subroutine of the measurement mode measurement process of FIG. 13 is a flowchart showing a continuation of FIG. 13 is a flowchart showing a continuation of FIG. 13 is a flowchart showing a continuation of FIG. It is a flowchart which shows the subroutine of the recording mode measurement process of FIG. It is a flowchart which shows the continuation of FIG.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  First, referring to FIG. 1 and FIG. 2, a temperature measuring device 10 according to the present embodiment is a member (heat generation) such as a soldering iron tip or a suction tip used in a solder suction device. This is a device for measuring the temperature of the member. In the illustrated example, the temperature measuring device 10 is connected to a computer 11 and used.

  The temperature measuring device 10 includes a housing 101. The casing 101 is installed along the long side in the direction facing the measurer. In the following description, the direction in which the housing 101 faces the user is assumed to be the front. The right side is the right side and the left side is the left side.

  A flat inspection work area 102 is formed at the front of the housing 101. In the housing 101 where the inspection work area 102 is located, a calculation unit of the measurement unit 103 and the like are incorporated. The measuring unit 103 includes two types of metal wires 103a and 103b of different types. Moreover, in order to hold | maintain each metal wire 103a, 103b, the two fixed terminals 104a, 104b erected in the inspection work area 102 are included. The fixed terminals 104a and 104b are opposed to each other at the left and right in the front portion of the inspection work area 102. Further, a movable terminal 104c that slides back and forth is provided on the rear side between the fixed terminals 104a and 104b. Each of the metal wires 103a and 103b is separately attached to the fixed terminals 104a and 104b separated from each other on the left and right sides, and the other end is fixed to the movable terminal 104c. Furthermore, the intermediate part of both the metal wires 103a and 103b is bundled by the sleeve 103c. The sleeve 103c is embodied by a metal having high thermal conductivity. The sleeve 103c is a portion that receives heat by directly contacting the heat generating member. The metal wires 103a and 103b receive heat from the heat generating member via the sleeve 103c, thereby generating a thermoelectromotive force. Each metal wire 103a, 103b, 103c constitutes a temperature measuring unit 130 of the measuring unit 103.

  A slide member 105 is provided below the inspection work area 102. The slide member 105 carries the movable terminal 104c. The slide member 105 and the inspection work area 102 are connected via a mechanism (not shown). The slide member 105 is coupled so as to be able to move back and forth between the lock position and the lock release position shown in FIG. The slide member 105 (and hence the movable terminal 104c) is fixed at the position shown in FIG. 1 in the locked position. When the lock is released, the movable terminal 104c can move from the lock position to the front lock release position. At the unlock position, the metal wires 103a and 103b can be attached and detached. A knob 106 protrudes from the rear portion of the slide member 105. When the knob 106 is slid forward, the mechanism is unlocked and the movable terminal 104c moves to the front unlock position. Further, when the knob 106 moved to the unlocking position is moved rearward, the movable terminal 104c is moved to the rearward locking position, and the movable terminal 104c is shown in FIG. Fixed in the locked position. As a result, the metal wires 103a and 103b held by the terminals 104a to 104c are held in a tensioned state. The material of the metal wire and the like are disclosed in detail in, for example, Japanese Patent No. 2668389 previously proposed by the applicant of the present application, and the remaining description is omitted. When the heat generating member comes into contact with the sleeve 103c, the heat is transmitted to the metal wires 103a and 103b. Each metal wire 103a, 103b generates an electromotive force according to the heat. Due to this electromotive force, a current flows to the internal arithmetic unit via the terminals 104a to 104c. The calculation unit outputs a detection signal Sd corresponding to the transmitted current.

  The rear side of the casing 101 is inclined so as to increase as it goes rearward. In this inclined portion, a display 110 and a plurality of buttons 111 to 115 are arranged.

  The display 110 is embodied by a liquid crystal panel.

  In front of the display 110, a power button 111, a setting button 112, a down scroll button 113, an up scroll button 114, and a registration button 115 are provided in order from the right side. The power button 111 is a switch connected to a power supply circuit (not shown). Further, the buttons 112 to 115 except for the power button 111 are connected to the control unit 120 built in the casing 101 via a bus 121 (see FIG. 2).

  A PC connection unit 116 for computer connection is provided on the right side of the housing 101. The PC connection unit 116 is embodied by USB, for example. The PC connection unit 116 is connected to the control unit 120 via the bus 121. The temperature measurement device 10 is connected to the computer 11 via the PC connection unit 116.

  A barcode reader connecting portion 117 is provided at the rear of the housing 101. The barcode reader connection unit 117 is embodied by a serial terminal. The barcode reader connection unit 117 is connected to the control unit 120 via the bus 121. A barcode reader 12 is connected to the temperature measurement device 10 via the barcode reader connection unit 117. In the illustrated example, a holder 118 that supports the barcode reader 12 is provided on the left side of the housing 101.

  As shown in FIG. 2, a memory 122 and a buzzer 123 are connected to the control unit 120 of the temperature measurement device 10 via a bus 121 in addition to the above-described elements.

  The control unit 120 is embodied by a microprocessor. The control unit 120 performs various functions such as a temperature measurement function, a life evaluation function of the metal wire 103a, a data communication function with the computer 11, and the like.

  The memory 122 is a comprehensive element including a ROM, a RAM, and an auxiliary storage device. The RAM also includes a non-volatile memory, and can store predetermined data even after the power is turned off. The memory 122 stores programs and data necessary for the control unit 120 to perform each function.

  The buzzer 123 is an example of notification means that is driven by the control unit 120 based on the occurrence of an error or the like.

  The program executed by the control unit 120 is configured to be alternatively selected from the selection screen displayed on the display 110 by appropriately operating the buttons 112 to 115.

  Next, among the functions executed by the control unit 120, a temperature measurement function and a life evaluation function that are the main points of the present embodiment will be described.

  First, the temperature measurement function is a function of measuring the temperature of the heat generating member. In this embodiment, two modes are prepared as modes for performing the temperature measurement function. One is a measurement mode, and the other is a recording mode. In the measurement mode, the temperature of the heat generating member is simply measured and displayed on the display 110. In the recording mode, the bar code reader 12 reads information including the part number of the heat generating member and the measurer ID from the barcode, and at the time of measurement, the measurer ID, the measurement date and time, the measurement temperature T, the set temperature Tn, and the suitability In this mode, processing data including a determination result is generated, and the generated processing data is transmitted to the computer 11 and recorded.

  In any mode, when the heat generating member comes into contact with the temperature measuring unit 130 at the time of measurement, a process of integrating count values corresponding to the number of temperature measurements is executed. In order to execute such processing, the memory 122 stores various data.

  In order to execute various functions in each mode, the control unit 120 functionally configures elements as shown in FIG.

  Referring to FIG. 3, the control unit 120 includes a measurement temperature specifying unit 200, a temperature determining unit 223, an integrating unit 201, a life determining unit 202, and a display processing unit 203 as modules used in any of the modes. To do.

  The measurement temperature specifying unit 200 is a module that calculates a measurement temperature T that is a measurement value based on the detection signal Sd output from the measurement unit 103. In both the measurement mode and the recording mode, the measured temperature specifying unit 200 outputs the measured temperature T to the integrating unit 201 and the display processing unit 203. However, as will be described later, the measurement temperature specifying unit 200 outputs different values as the measurement temperature T in the measurement mode and the recording mode.

  The accumulating unit 201 is a module that accumulates count values corresponding to the number of times of temperature measurement and outputs the accumulated number n when a predetermined condition is satisfied when the heat generating member comes into contact with the temperature measuring unit 130. That is, when the heat generating member comes into contact with the temperature measuring unit 130, the number of times of contact is integrated with a count value corresponding to the number of times of temperature measurement. The accumulation unit 201 outputs the cumulative number n to both the life determination unit 202 and the display processing unit 203. Here, in order to update the cumulative number n, the accumulated temperature Ts is stored in the memory 122 (see FIGS. 4 to 10). The integrated temperature Ts is a temperature value used as a threshold value when the count values are integrated. When the measurement temperature T based on the detection of the measurement unit 103 is equal to or higher than the integrated temperature Ts, the integration unit 201 stores the number of times that the heating member contacts the temperature measurement unit 130 in the memory 122 based on a control procedure described later. Add to the cumulative count n. The integrated temperature Ts is appropriately determined based on the type of heating member, experimental values, and the like. For example, when the heat generating member is a soldering iron, it is preferably set near the melting point of the solder. When the solder is so-called lead-free solder, the integrated temperature Ts is set to 200 ° C. as a general-purpose example. However, as shown in Table 2 of JIS 3282: 2006, the lead-free solder is divided into medium, high, medium, medium, and low temperature melting temperatures according to the solidus temperature and liquidus temperature. Within each category, they are subdivided by alloy composition and are diverse. Therefore, it is preferable that an appropriate value can be appropriately selected according to the solder used. From such a point of view, the integrated temperature Ts may be a specification that can be set as a variable that can be changed by the user as well as a constant when shipped from the factory.

  The lifetime determination unit 202 is a module that predicts the lifetime of the metal wires 103a and 103b based on the cumulative number n of count values accumulated. Note that the lifetimes of the metal wires 103a and 103b are not necessarily indispensable because they often vary greatly depending on variations and materials based on individual differences. The life determination unit 202 outputs the life determination result to the display processing unit 203. The determination result may be Boolean type data indicating whether or not replacement is required, or may be data that displays the predicted remaining number of times as a numerical value.

  The display processing unit 203 is a module that displays display contents on the display 110 using a GUI based on various types of input data.

  Next, as a module for executing the measurement mode, the control unit 120 configures a temperature change calculation unit 210, a duration measurement unit 211, and a high temperature duration measurement unit 212. In the measurement mode, the measurement temperature specifying unit 200 outputs the measurement temperature T calculated based on the detection signal Sd in addition to the outputs to the integration unit 201 and the display processing unit 203 as it is, the temperature change calculation unit 210, the duration measurement unit 211, And output to the high temperature duration measurement unit 212.

  The temperature change calculation unit 210 is a module that calculates a temperature change per unit time (for example, 0.1 seconds) based on the value of the measured temperature T output from the measured temperature specifying unit 200 and outputs a predetermined signal. . The temperature change calculation unit 210 is used to prevent the influence of temperature rise due to supercooling. Here, the supercooling illustrated in FIG. 4 will be described.

  Supercooling is a process in which molten metal solidifies. Even if a phase reaches the solidification start temperature, the phase does not start solidification immediately, but once it has dropped to a temperature slightly lower than the solidification temperature, it solidifies. This is a phenomenon in which the temperature is raised again to return to the solidification temperature, and a constant temperature is maintained while the phase continues to crystallize. Further, once the temperature becomes lower than the solidification temperature, the point of temperature rise is sometimes referred to as recuperation. In the example of FIG. 4, the temperature rise at timing tr is a temperature rise due to supercooling.

  In this embodiment, overcooling caused by the solder adhering to the soldering iron as the heat generating member becomes a problem. In particular, when the solder is lead-free solder, overcooling is likely to occur. For example, according to “Volume ratio of solidification process and crystallized phase of Sn—Ag—Cu ternary alloy” published by Yoshiko Miyauchi et al. (Journal of Electronics Packaging Society Vol. 13, No. 7, 2010), melting point It shows that the Sn—Ag—Cu ternary alloy whose temperature has been lowered from 2 to 21 ° C. is heated to about 20 ° C. or less.

  Such supercooling or recuperation adversely affects the life evaluation of the temperature measuring unit 130, particularly the metal wires 103a and 103b. That is, the lifetime of the metal wires 103a and 103b is the case where the heat generating member is heated to a temperature equal to or higher than the integrated temperature (for example, 200 ° C.) Ts in FIG. 4, and the metal wires 103a and 103b are loaded from the heat generating member. When receiving, it needs to be evaluated based on the contact period (between timing t0 and toff in FIG. 4). However, if the solder adheres to the temperature measuring unit 130, once the measured temperature T falls below the integrated temperature Ts at the timing toff, the solder adhered to the sleeve 103c and the like is overcooled, The temperature detected by the measurement unit 103 may rise above the integrated temperature Ts again at the timing tr. Therefore, if the cumulative number n is updated based only on the temperature detected by the measuring unit 103, the cumulative number n is updated again even though the heat generating member is already away from the temperature measuring unit 130. It is. Therefore, when evaluating the lifetime of the metal wires 103a and 103b, it is necessary to eliminate the influence of supercooling.

  In order to identify overcooling, in this embodiment, the temperature change calculation unit 210 outputs a temperature increase value ΔTu (see FIGS. 5 to 8) to the integration unit 201. The temperature increase value ΔTu is the value of the temperature that has increased per unit time when the measured temperature T has increased. Along with this, the temperature rise determination value Tu is stored in the memory 122. The temperature rise determination value Tu is appropriately determined based on the type of solder in which the tip as the heat generating member melts, an experimental value, and the like. For example, as a general example, the temperature rise determination value Tu is set to 20 ° C. The temperature rise determination value Tu may be a constant when shipped from the factory, or may be a variable that can be changed by the user.

  In the measurement mode, the integration unit 201 reads the temperature increase determination value Tu from the memory 122. Next, it is determined whether or not the temperature increase value ΔTu output from the temperature change calculation unit 210 is equal to or higher than the temperature increase determination value Tu, and the count value is integrated to determine whether or not the cumulative number n should be updated. Thereby, when the measurement temperature T rises, the integrating unit 201 can determine whether the temperature rise is due to contact of the heat generating member or due to supercooling.

  The duration measuring unit 211 uses a preset time interval as one segment of the duration Tr1 (see FIGS. 5 to 10), and sets the elapsed time for each duration Tr1 after the measured temperature T reaches the integrated temperature Ts or more. This module functions as a timer to measure. In a state where the high-temperature heating member is pressing the temperature measuring unit 130, a considerable load is applied to the metal wires 103a and 103b. The cumulative number n is to be updated. The duration time Tr1 is appropriately determined according to the types of metal wires 103a and 103b of the temperature measuring unit 130, experimental values, and the like. For example, as a general example, the duration Tr1 is set to 15 seconds. The duration Tr1 may be a constant when shipped from the factory, or may be a variable that can be changed by the user.

  As shown in FIGS. 5 and 6, when the measured temperature T reaches the integrated temperature Ts at the timing t0, the duration Tr1 is measured from the timing t0 by a control procedure described later. As shown in FIG. 5, if the measured temperature T falls below the integrated temperature Ts before the continuation time Tr1 elapses, the cumulative number n is updated only at the timing t0 (ie, only once). . On the other hand, as shown in FIG. 6, when the measured temperature T is equal to or higher than the integrated temperature even if the duration time Tr1 has elapsed, the cumulative number n is updated every time the duration time Tr1 elapses (timing t1, t2). Is done.

  Next, an exception when measuring the duration time Tr1 will be described.

  Referring to FIG. 7, when the measurer moves the heating member away from temperature measuring unit 130 during measurement of duration Tr1 (for example, at timing t1), measured temperature T decreases from that point. However, depending on the timing when the heat generating member moves away from the temperature measuring unit 130, the timing t2 at which the duration Tr1 elapses is later than the timing toff at which the measured temperature T falls below the integrated temperature Ts. There is. In such a case, since the heat generating member is actually away from the temperature measuring unit 130, the cumulative number n should not be updated from the viewpoint of life evaluation. Therefore, as shown in FIG. 7, when the measurer moves the heating member away from the temperature measuring unit 130 during the measurement of the duration Tr1, the measurement of the duration Tr1 is reset, and the count value is accumulated excessively. Measures to avoid are taken. Specifically, a temperature drop value ΔTd is output from the temperature change calculation unit 210 and input to the integration unit 201. Along with this, the temperature drop determination value Td is stored in the memory 122. The temperature lowering determination value Td is appropriately determined based on the type of solder in which the tip as the heat generating member melts, an experimental value, and the like. For example, as a general example, the temperature decrease determination value Td is set to 10 ° C. The temperature decrease determination value Td may be a constant when shipped from the factory, or may be a variable that can be changed by the user.

  In the measurement mode, the integration unit 201 reads the temperature decrease determination value Td from the memory 122. Next, it is determined whether or not the temperature drop value ΔTd output from the temperature change calculation unit 210 is equal to or greater than the temperature drop determination value Td.

  The integrating unit 201 is preset with a temperature drop value ΔTd per unit time (for example, 0.1 second) set in advance when the measured temperature T falls while the temperature drop value ΔTd is measured for the duration time Tr1. When the temperature lowering determination value Td is equal to or greater than that, the measurement of the duration time Tr1 is reset at that time and remeasured. Thus, as shown in FIG. 7, when the measurer moves the heating member away from the temperature measuring unit 130 during the measurement of the duration Tr1, the measurement of the duration Tr1 is performed after the temperature drop value ΔTd is determined to lower the temperature. It is reset when it has fallen by more than the value Td (at timing td in FIG. 7), and re-measurement is started after reset. As a result, at the timing t2 when the continuation time Tr1 measured before re-measurement elapses, the cumulative number n is not updated, and extra accumulation is avoided.

  Next, when the temperature rise value ΔTu is less than the temperature rise determination value Tu and the measured temperature T is equal to or higher than the integrated temperature Ts, the high temperature duration measurement unit 212 starts from the time when the measured temperature T reaches the integrated temperature Ts. Then, a preset high temperature duration time Tr2 is measured. The high temperature continuation time Tr2 is set as a time interval suitable for waiting for the temperature raised by the supercooling to fall again.

  Referring to FIG. 8, when temperature rise value ΔTu is less than temperature rise determination value Tu, that is, when the rise characteristic is slow even if the temperature rises, the integrating unit is used to eliminate the temperature rise due to overcooling. 201 no longer updates the cumulative number n. However, even if the temperature rises slowly, if the heating member abuts on the temperature measuring unit 130 and a considerable time has elapsed, it is assumed that the metal wires 103a and 103b are under load, and the accumulated number of times It may be better to update n. On the other hand, even when the measured temperature T is equal to or higher than the integrated temperature Ts, the temperature rise due to supercooling needs to be eliminated. Therefore, in the present embodiment, the high temperature duration time Tr2 is measured, and when the high temperature duration time Tr2 has elapsed, the cumulative number n is updated at the timing t3.

  The high temperature duration Tr2 is appropriately determined depending on the type of solder used for the soldering iron as the heat generating member. That is, when supercooling occurs, as indicated by Te in FIG. 8, the time during which the measured temperature T is maintained at or above the integrated temperature Ts can be specified by experiments or the like. Therefore, by setting a time sufficiently higher than the time Te as the high temperature duration time Tr2, it is possible to avoid a temperature rise due to overcooling. For example, as a general example, the high temperature duration Tr2 is set to 6 seconds. The high temperature duration time Tr2 may be a constant when shipped from the factory, or may be a variable that can be changed by the user.

  As shown in FIG. 8, when the measured temperature T reaches the integrated temperature Ts at the timing t0 and the temperature rise value ΔTu is less than the temperature rise determination value Tu, the cumulative number n is at the timing t0. , Not accumulated. However, the high temperature duration measurement unit 212 starts measuring the high temperature duration Tr2 when the measured temperature T reaches the integrated temperature Ts, that is, at the timing t0. As shown in FIG. 8, if the high temperature duration time Tr2 elapses at the timing t3, the cumulative number n is updated at the timing t3. Then, as will be described later, the measurement of the duration time Tr1 is started from this timing t3, and thereafter, the cumulative number n is updated every time the high temperature duration time Tr2 elapses (timing t1, t2).

  Next, referring again to FIG. 3, as a module used in the recording mode, the control unit 120 includes an inspection time measurement unit 220, a temperature difference calculation unit 221, an error determination unit 222, and a temperature determination unit 223. In the recording mode, the measured temperature specifying unit 200 outputs the measured temperature T to the inspection time measuring unit 220, the temperature difference calculating unit 221, and the temperature determining unit 223 in addition to the outputs to the integrating unit 201 and the display processing unit 203.

  Here, the measured temperature specifying unit 200 performs a process of fixing the measured temperature T to a predetermined value (this process is referred to as “max hold”) in the recording mode. In the max hold, the temperature corresponding to the maximum value within a preset time among the plurality of detection signals Sd based on the detection signal Sd output by the measurement unit 103 every unit time is fixed as the measurement temperature T. Yes. When the max hold is executed, even if the measurement temperature T varies due to camera shake or the like, the substantial temperature of the heat generating member can be specified to a constant value, so that erroneous recognition can be prevented. . As described above, in the recording mode, the measured temperature T output to the integrating unit 201, the display processing unit 203, the inspection time measuring unit 220, the temperature difference calculating unit 221, and the temperature determining unit 223 is maximized by the max hold. It is a fixed value.

  The inspection time measuring unit 220 is a module that measures a preset time interval as the inspection time Tr3 after the max hold is executed. The inspection time Tr3 is determined based on an experiment or the like as a suitable time interval for the control unit 120 to determine the measured temperature T. For example, as a general example, the inspection time Tr3 is set to 4.5 seconds. The high temperature duration time Tr2 may be a constant when shipped from the factory, or may be a variable that can be changed by the user. The reason for setting the inspection time Tr3 is as follows.

  Referring to FIG. 9, in this figure, it is assumed that the measurement temperature T is specified as C1 in the figure. In this case, in the recording mode, when the measurer brings the heating member into contact with the temperature measuring unit 130, the value indicated by tmax in FIG. Therefore, an appropriate inspection can be executed based on the measured temperature T fixed by the max hold.

  On the other hand, as shown in FIG. 10, in the case where the original specification of the measurement temperature T is as shown in C1, the measurer mistakenly within a predetermined time after the heating member is brought into contact with the temperature measurement unit 130. When the heat generating member is separated from the temperature measuring unit 130, the specified measurement temperature T is lowered in the middle like C2. For this reason, the value tmax that is max-held for the characteristic C2 may be lower than the maximum value of the actual measurement temperature T. In such a case, if the determination process is executed, a determination error increases, which is not preferable. Therefore, an inspection time Tr3 is provided, and when a temperature change occurs during this time, an error determination is executed, and in a predetermined case, an error process is executed.

  In the present embodiment, the inspection time measuring unit 220 has a function of resetting the inspection time Tr3 under a certain condition. First, the memory 122 stores a first determination value Df. When the actual temperature change during measurement (temperature change based on the detection signal Sd) is large, the first determination value Df is stabilized by resetting the inspection time Tr3 during measurement and executing the recount process. There is a function of max-holding the measured temperature T. The first determination value Df is set based on a value such as the resolution of the measurement unit 103. The first determination value Df may be a constant when shipped from the factory, or may be a variable that can be changed by the user. In order to reset the inspection time Tr3 under a certain condition, the inspection time measurement unit 220 is configured to refer to the value of the detected temperature difference Tdf calculated by the temperature difference calculation unit 221 described below.

  Next, the temperature difference calculation unit 221 detects the difference in detected temperature between the temperature detected by the measurement unit 103 and the measured temperature T that has been held based on the change in the detection signal Sd during the elapse of the inspection time Tr3. This module calculates Tdf. As described above, in the case where it is detected that the temperature detected by the measurement unit 103 has changed due to camera shake or the like, when the max hold is performed, it is impossible to detect the temperature change from the measured temperature T. Therefore, in this embodiment, the temperature at each timing is calculated based on the detection signal Sd, and this value is compared with the measured temperature T to calculate the detected temperature difference Tdf. The calculated detected temperature difference Tdf is output to the error determination unit 222.

  The error determination unit 222 is a module that determines a measurement failure based on the detected temperature difference Tdf. The memory 122 stores a second determination value Ds. The second determination value Ds is appropriately determined based on the specifications of the measurement unit 103, experimental values, and the like. For example, as a general example, the second determination value Ds is set to −50 ° C. The second determination value Ds may be a constant when shipped from the factory, or may be a variable that can be changed by the user.

  In the recording mode, the error determination unit 222 reads the second determination value Ds from the memory 122. Next, it is determined whether or not the detected temperature difference Tdf output from the temperature difference calculation unit 221 is less than the second determination value Ds. The error determination unit 222 executes error determination when the detected temperature difference Tdf is equal to or greater than the second determination value Ds when the temperature based on the detection signal Sd decreases during the measurement of the inspection time Tr3. . Thereby, as shown in FIG. 10, when the measurer moves the heating member away from the temperature measuring unit 130 during the measurement of the inspection time Tr3, the error determination unit 222 performs error determination. As a result, a temperature test based on an inappropriate detection value can be avoided.

  The result of the error determination is output to the temperature determination unit 223. The result of the error determination is, for example, Boolean type data indicating the quality of the measured temperature T.

  The temperature determination unit 223 is a module that determines the suitability of the temperature of the heat generating member based on the measured temperature T. If the determination result of the error determination unit 222 indicates the presence of a measurement error, the temperature determination unit 223 displays a signal indicating that a measurement error has occurred, instead of data indicating whether the measurement temperature T is acceptable. The data is output to the unit 203. The display processing unit 203 displays a measurement error on the display 110 based on this output. At this time, a measurement error may be transmitted to a driver (buzzer control unit) (not shown) that controls the buzzer 123 and the buzzer 123 may be driven to notify the measurement person of the measurement error. In this case, the display 110 and the buzzer 123 function as a notification unit that notifies the measurement person of the measurement error. On the other hand, when the result of the error determination indicates that there is no measurement error, the quality of the measurement temperature T is determined based on a known process. The determination result of the measurement temperature T is, for example, Boolean type data indicating the quality of the measurement temperature T. The temperature determination unit 223 outputs the determination result to the display processing unit 203.

  Next, a processing procedure according to the above configuration will be described with reference to FIG.

  Referring to FIG. 11, when the measurer operates power button 111 to turn on the power, control unit 120 executes initialization. Specifically, an initial screen indicating that the apparatus has started up is displayed, and the mode code Md is set to 1 (step S1). Here, the mode code Md is a variable for specifying the processing mode. When the mode code Md is 1, the measurement mode is selected. When the mode code Md is 2, the recording mode is selected.

  From this first screen, the measurer operates the registration button 115 to change the mode code Md and change various modes. The measurer can then execute the changed mode. After executing the initialization, the control unit 120 determines whether or not there is a mode switching operation (step S2). If a mode change operation is performed, the control unit 120 activates a program related to the changed mode and executes an update process (step S3). At this time, the mode code Md to be executed is specified, and a screen based on the mode code Md is displayed on the display 110 (step S4). When the mode change operation is not performed in step S2, the control unit 120 executes step S4 as it is based on the mode code Md set at the present time.

  Next, the control unit 120 executes a program for each mode code Md (steps S5, S51, S52, S53). In this step, various modes set in the temperature measuring device 10 are selected and executed according to the mode code Md.

  Thereafter, the control unit 120 repeats the processing from step S2 onward until the power is turned off (step S6).

  In step S5 described above, when the mode code Md is 1, a measurement mode measurement process is executed (step S51). If the mode code Md is 2, a recording mode measurement process is executed (step S52). Next, these will be described.

  Referring to FIG. 12, in the measurement mode measurement process (step S51), the control unit 120 reads the cumulative number n from the memory 122 (step S501). Next, the control unit 120 initializes various variables and flags (step S502). The variables initialized by this process include an update count value m, a duration time Tr1, and a high temperature duration time Tr2. In the following description, tf is an array variable and is a measured value indicating a time interval set for each measured time. In order to avoid complication, in the following description, it is simply expressed as “tf”. However, actually, for example, tf (1) = 14 seconds is set as the time interval of the duration time Tr1, and the time interval of the high temperature duration time Tr2 is set. Tf (2) = 6 seconds is set. In the following description, a function for measuring the update count value m is referred to as an update counter, and functions for measuring the duration Tr1 and the high temperature duration Tr2 are referred to as a duration timer and a high temperature duration timer, respectively.

  The update count value m is a value indicating the number of times the control unit 120 has read the measured temperature T. The reason for using the update count value m is to avoid updating the cumulative number n when the measured temperature T does not reach the integrated temperature Ts when the temperature increase value ΔTu is equal to or higher than the temperature rise determination value Tu.

  The flags to be initialized include an initial flag Fg1, a sudden rise flag Fg2, and a fall flag Fg3.

  The initial flag Fg1 is a flag indicating an aspect (status) from when execution of the measurement mode measurement process is started until the cumulative number n is updated for the first time (this is also referred to as “initial update”). The initial value of the initial flag Fg1 is set to False, and is changed to True when the initial update is executed.

  The rapid increase flag Fg2 indicates a determination result of whether or not the temperature increase value ΔTu is equal to or higher than the temperature increase determination value Tu, and is set to True when the temperature increase value ΔTu is equal to or higher than the temperature increase determination value Tu. . The initial value is False.

  The decrease flag Fg3 indicates a determination result of whether or not the temperature decrease value ΔTd is equal to or higher than the temperature decrease determination value Td, and is set to True when the temperature decrease value ΔTd is equal to or greater than the temperature decrease determination value Td. The initial value is False.

  Next, the control unit 120 reads the measured temperature T (step S503). In step S503, the control unit 120 functions as the measured temperature specifying unit 200 and the integrating unit 201, and calculates the measured temperature T from the detection signal Sd.

  Next, the control unit 120 increments the update count value m (step S504).

  Next, the control unit 120 calculates a temperature increase value ΔTu based on the measured temperature T, and determines whether the temperature increase value ΔTu is equal to or higher than the temperature increase determination value Tu (step S505). In step S505, the control unit 120 functions as the temperature change calculation unit 210 and the integration unit 201, and distinguishes between the case where the heat generating member comes into contact with the temperature measurement unit 130 and the temperature increase due to supercooling.

  In step S505, when the temperature increase value ΔTu is equal to or higher than the temperature increase determination value Tu, the control unit 120 sets the rapid increase flag Fg2 to True (step S506), and then the value of the update count value m is set in advance. It is determined whether or not the upper limit value ms is exceeded (step S507). The upper limit value ms is set to 3 times, for example, and is stored in the memory 122 in advance. If the temperature increase value ΔTu is less than the temperature increase determination value Tu in step S505, the control unit 120 bypasses step S506 and proceeds to the next step S507.

  Next, when the update count value m is less than the upper limit value ms in step S507, the control unit 120 determines whether or not the measured temperature T has reached the integrated temperature Ts (step S508).

  In step S508, when the measured temperature T has reached the integrated temperature Ts, the control unit 120 determines whether or not the rapid increase flag Fg2 is set to True (step S509).

  In step S509, when the rapid increase flag Fg2 is set to True, it indicates that the heat generating member is in contact with the temperature measuring unit 130 and the measured temperature T has reached the integrated temperature Ts or more. In that case, it is necessary to update the cumulative number n. Therefore, the control unit 120 updates the cumulative number n when the rapid increase flag Fg2 is set to True in step S509 (step S510). By executing step S510, the accumulated number n is updated when the measured temperature T rises to the integrated temperature Ts, as indicated by the timing t0 in FIGS.

  After step S510 is executed, the control unit 120 stops counting the update count value m (step S511). Since the update count value m is used to avoid updating the cumulative number n when the measured temperature T is less than the integrated temperature Ts, the update count value m is used when the measured temperature T is equal to or higher than the integrated temperature Ts. This is because there is no need to count. In order to avoid duplication of update, the control unit 120 sets the value of the rapid increase flag Fg2 to False (step S512). Further, the high temperature continuation timer is set to OFF (step S513).

  On the other hand, if the update count value m is greater than or equal to the upper limit value ms in step S507, the control unit 120 sets the rapid increase flag Fg2 to False (step S514). In this aspect, although the temperature rise value ΔTu is equal to or higher than the temperature rise determination value Tu, the control unit 120 reads the measured temperature T more than the number of times corresponding to the upper limit value ms while the measured temperature T remains below the integrated temperature Ts. I mean. Therefore, in such a situation, the count value integration process is stopped and the process returns to the main routine. Therefore, after executing step S514, the control unit 120 stops counting the duration time Tr1 (step S515), initializes the initial flag Fg1 (step S516), and returns to the main routine.

  Note that the order of step S510 to step S513 described above may be arbitrarily changed.

  Referring to FIG. 13, after executing steps S510 to S513 described above, control unit 120 determines whether or not temperature drop value ΔTd is equal to or higher than temperature drop determination value Td (step S520). That is, it is determined whether or not the temperature drop value ΔTd has decreased by a temperature drop determination value Td or more. In this aspect, the control unit 120 functions as the integrating unit 201.

  In step S520, when the temperature drop value ΔTd is equal to or higher than the temperature drop determination value Td, that is, as shown in FIG. 7, when the measured temperature T rises above the integrated temperature Ts, the measured temperature T drops at a predetermined rate. If so, the descent flag Fg3 is set to True (step S521).

  When step S521 is executed or when the temperature drop value ΔTd is less than the temperature drop determination value Td in step S520, the control unit 120 sets the initial flag Fg1 to True (step S522). This is because the cumulative number n is updated in step S510 in this aspect. Next, the control unit 120 sets the rapid increase flag Fg2 to False (step S523). This is because, in this aspect, since the measured temperature T has risen to the integrated temperature Ts or higher, the process for supercooling becomes unnecessary.

  Next, the control unit 120 determines whether or not the measurement of the duration time Tr1 is being executed (step S524), and starts the measurement of the duration time Tr1 if the measurement of the duration time Tr1 is not being executed. (Step S525). In this aspect, the control unit 120 functions as the duration measuring unit 211 and measures the duration Tr1.

  When step S525 is executed, or when measurement of the duration time Tr1 has already been executed in step S524, the control unit 120 determines whether or not the duration time Tr1 has reached the measurement value tf (step S526). .

  In step S526, when the duration time Tr1 is equal to or longer than the measurement value tf, the control unit 120 integrates the count value and updates the cumulative number n (step S528). As a result, as shown in FIGS. 5 to 8, the count value is integrated for each duration time Tr <b> 1, and the cumulative number n can be updated.

  When step S528 is executed, the control unit 120 restarts the measurement of the duration time Tr1 (step S529). As a result, as shown in FIG. 6 and FIG. 8, it is possible to measure a plurality of durations Tr1, add the count values at each elapsed timing t1, t2,. .

  After executing step S529 or when the duration time Tr1 is less than the measured value t in step S526, the control unit 120 determines the value of the descent flag Fg3 (step S530). This is to determine whether or not a temperature drop has occurred during the measurement of the duration time Tr1.

  In step S530, when the value of the descending flag Fg3 is True, that is, as shown in the timing td of FIG. 7, when the temperature drop value ΔTd during the measurement of the duration Tr1 is equal to or greater than the temperature drop determination value Td, the control unit 120 interrupts the measurement of the duration time Tr1 and executes re-measurement (step S531). As a result, the cumulative number n is not updated at the timing t2 when the continuation time Tr1 measured before re-measurement elapses, and extra accumulation is avoided.

  Referring to FIG. 13 again, after executing step S532 or when the value of the drop flag Fg3 is False in step S530, the control unit 120 determines whether or not the measured temperature T is equal to or higher than the integrated temperature Ts. Is determined (step S533).

  If the measured temperature T is equal to or higher than the integrated temperature Ts in step S533, the control unit 120 returns to step S503 in FIG. 12 and repeats the above-described processing. In this aspect, since the measured temperature T is still equal to or higher than the integrated temperature Ts, it is necessary to integrate the count value for each duration Tr1 and update the cumulative number n.

  On the other hand, in step S533, for example, when the timing toff in FIGS. 5 to 8 has elapsed, the measured temperature T is less than the integrated temperature Ts. In such a case, the control unit 120 returns to step S515 in FIG. 12, executes steps S515 and S516, and then returns to the main routine. This is because, in this aspect, since the measured temperature T is lowered, it is not necessary to update the cumulative number n for life evaluation.

  Next, the case where the measured temperature T does not reach the integrated temperature Ts in step S508 of FIG. 12 will be described with reference to FIG.

  As shown in FIG. 14, even when the measured temperature T does not reach the integrated temperature Ts, the sudden rise flag Fg2 may be set to True. Therefore, in the present embodiment, first, the value of the rapid increase flag Fg2 is determined (step S540).

  In step S540, when the value of the rapid increase flag Fg2 is False, it is determined that the measured temperature T is lower than the integrated temperature, and that no temperature increase occurs when the heat generating member contacts the temperature measuring unit 130. can do. Therefore, if the value of the rapid increase flag Fg2 is False, the control unit 120 turns off the update counter (step S541), then proceeds to step S515 in FIG. 12, and executes steps S515 and S516. Return to the main routine.

  On the other hand, when the rapid increase flag Fg2 is True in step S540, the change of the rapid increase flag Fg2 is determined based on the value of the update count value m in order to eliminate the possibility of erroneous detection or the like. Specifically, the control unit 120 determines the state of the update count value m (step S542).

  If the update count value m is counted in step S542, the control unit 120 moves to step S503 and repeats the above-described processing. When the update count value m is counted, if it is greater than or equal to the upper limit value ms in step S507, the process proceeds to step S514 or lower regardless of the value of the rapid increase flag Fg2, and the cumulative number n is updated at low temperatures. This is to avoid it. Thereby, unnecessary integration of the count value is avoided.

  If the update count value m is not counted in step S542, the control unit 120 initializes the update count value m (step S543), starts counting the update count value m (step S544), The process proceeds to S503. After shifting to step S503, as described above, it is determined in step S507 in FIG. 12 whether or not the value of the update count value m is equal to or greater than a preset upper limit value ms. When the update count value m is equal to or higher than the upper limit value ms, it means that the control unit 120 reads the measured temperature T higher than the upper limit value ms while the measured temperature T remains below the integrated temperature Ts. After that, it returns to the main routine. Therefore, unnecessary integration of the count value is reliably avoided while avoiding erroneous detection.

  Next, the case where the rapid increase flag Fg2 is False in step S509 of FIG. 12 will be described with reference to FIGS.

  As shown in FIG. 8, in step S509 of FIG. 12, when the rapid increase flag Fg2 is False, the temperature increase value ΔTu increases slowly, but the measured temperature T is in a high temperature state equal to or higher than the integrated temperature Ts. ing. In such an aspect, it is necessary to identify whether the temperature increase of the measurement temperature T is due to the heat generating member or the supercooling. Therefore, in the present embodiment, the control unit 120 functions as the high temperature duration measurement unit 212 and measures the high temperature duration Tr2 based on the following procedure.

  First, the control unit 120 determines the value of the initial flag Fg1 (step S550). In step S550, if the value of the initial flag Fg1 is True, the control unit 120 immediately moves to step S524 in FIG. 13 and repeats the above-described processing. This is because, in this aspect, since the update of the first cumulative number n has already been completed, it is only necessary to repeat the update of the cumulative number n every time the duration Tr1 progresses thereafter. On the other hand, when the value of the initial flag Fg1 is False in step S550, the control unit 120 determines whether or not the measurement of the high temperature duration time Tr2 is being performed (step S551). In step S551, when the measurement of the high temperature duration time Tr2 is not executed, the control unit 120 initializes the value of the high temperature duration time Tr2 (step S552) and starts the measurement (step S553). When step S553 is executed or when measurement of the high temperature duration time Tr2 is executed in step S551, the control unit 120 further determines whether or not the high temperature duration time Tr2 has reached the measurement value tf. (Step S554). As indicated by timing t3 in FIG. 8, when the high temperature duration time Tr2 has reached the measured value tf in step S554, the control unit 120 proceeds to step S510 and updates the cumulative number n. As a result, as shown in FIG. 8, when the high temperature duration time Tr2 reaches the measurement value tf, the cumulative number n is updated, and thereafter, the cumulative number n is updated every time the duration time Tr1 elapses. Can be executed. On the other hand, when the high temperature continuation time Tr2 has not reached the measurement value tf in step S554, the control unit 120 proceeds to step S503 and repeats the above-described processing.

  Next, the case where the recording mode measurement process (step S52) is executed in step S5 of FIG. 11 will be described with reference to FIGS. 9, 10, 16, and 17. FIG.

  In the recording mode measurement process (step S52), the control unit 120 initializes variables and flags necessary for executing the recording mode (step S571). The variables initialized by this process include the inspection time Tr3 and the detected temperature difference Tdf. Further, the flag that is initialized in step S571 includes a max hold flag Fg4. The max hold flag Fg4 is set to True when the control unit 120 functioning as the measured temperature specifying unit 200 executes the max hold. The initial value of the max hold flag Fg4 is False. In FIG. 16, tf is a measurement value set by an array variable in order to measure the inspection time Tr3. In FIG. 16, the measured value tf is set to 4.5 seconds, for example. The function of measuring the inspection time Tr3 is referred to as a temperature change timer.

  Next, the control unit 120 executes a barcode reading process (step S570). In this process, the control unit 120 waits for transmission of data read by the barcode reader 12 from a barcode not shown. When the identification information of the measurer, the identification information of the heat generating member, and the set temperature Tn included in the data are read, the communication with the barcode reader 12 is terminated.

  Next, the control unit 120 reads the measured temperature T (step S572). Next, the control unit 120 functions as the measured temperature specifying unit 200 in the recording mode, and executes max hold (step S573). After executing the max hold, the control unit 120 sets the max hold flag Fg4 to True (step S574).

  Next, the control unit 120 starts measuring the inspection time Tr3 (step S575). In this aspect, the control unit 120 functions as the inspection time measuring unit 220. As shown in FIGS. 9 and 10, the inspection time Tr3 is measured with a timing tm at which the measured temperature T is held as a base point.

  Next, the control unit 120 calculates a detected temperature difference Tdf based on the maximum held measured temperature T and the detection signal Sd of the measuring unit 103 (step S577). In this aspect, the control unit 120 functions as the temperature difference calculation unit 221.

  Next, the control unit 120 compares the detected temperature difference Tdf with the first determination value Df, and determines whether or not the detected temperature difference Tdf exceeds the first determination value Df (step S578). If the detected temperature difference Tdf exceeds the first determination value Df, it is determined that the detected temperature has changed greatly and is still unstable. Therefore, when the detected temperature difference Tdf exceeds the first determination value Df, the inspection time Tr3 is reset to 0 (step S579). As a result, the inspection time Tr3 is extended. On the other hand, when the detected temperature difference Tdf is equal to or smaller than the first determination value Df, it is determined that the detected temperature change is small and stable. Therefore, when the detected temperature difference Tdf is equal to or smaller than the first determination value Df, the process bypasses step S579 and proceeds to the next step. In this aspect, the control unit 120 functions as the temperature time measurement unit 220.

  Next, after executing step S579 or when step S579 is bypassed, the control unit 120 compares the calculated detected temperature difference Tdf with the second determination value Ds, and the detected temperature difference Tdf is the second value. It is determined whether it is less than the determination value Ds (step S580). In this aspect, the control unit 120 functions as the error determination unit 222.

  In step S580, when the detected temperature difference Tdf is equal to or larger than the second determination value Ds, the measured temperature T is accurately changed due to the temperature change after the max hold is performed as shown by the specific C2 in FIG. The maximum value may not have been specified. For example, when the tip is separated and there is a temperature change of 50 ° C. or more, an error display or the like needs to be executed. Therefore, when the detected temperature difference Tdf is equal to or larger than the second determination value Ds, the control unit 120 executes an error process (step S581) and stops the measurement process. In the error process, the display 110 and the buzzer 123 are appropriately used as described above to notify the measurement person of the measurement error, cancel the measurement process, and return to the main routine.

  On the other hand, when the detected temperature difference Tdf is less than the second determination value Ds in step S580, it is considered that the measured temperature T is appropriately detected and held as shown by the characteristic C1 in FIG. Therefore, when the detected temperature difference Tdf is less than the second determination value Ds, the control unit 120 determines whether or not the inspection time Tr3 has passed the measurement value tf (step S582). In step S582, while the inspection time Tr3 has not passed the measurement value tf, the control unit 120 proceeds to step S576 and repeats the above-described processing. On the other hand, when the inspection time Tr3 has passed the measurement value tf in step S582, as shown in FIG. 17, the control unit 120 updates the cumulative number n (step S590), determination processing (step S591), and recording processing. (Step S592) An end process (step S593) such as turning off the temperature change timer is executed. Through these processes, the suitability of the measured temperature T is determined, and the determination result is transmitted to the computer 11 and recorded.

  In each execution process of the measurement mode measurement process 51 and the recording mode measurement process 52, the control unit 120 functions as the display processing unit 203 and displays the measurement temperature T, the cumulative number n, the inspection result of the measurement temperature T, and the like as appropriate. 110.

  As described above, in the present embodiment, the heating member can be applied to the temperature measuring unit 130, the temperature of the heating member can be measured, and the measurement result can be displayed. At the same time, the temperature rise value ΔTu of the measured temperature T that has risen per unit time set in advance is equal to or higher than the preset temperature rise determination value Tu, and the measured temperature T is equal to or higher than the preset integrated temperature Ts. When it reaches, the count value is integrated and the cumulative number n is updated. Here, when the count value is integrated, even if the temperature measured by the measuring unit 103 is equal to or higher than the integrated temperature Ts, if the temperature increase value ΔTu is less than the temperature rise determination value Tu, the count value is integrated excessively. It will not be done. This makes it possible to accurately grasp the actual number of measurements while avoiding the thermal effect of supercooling.

  Further, in the present embodiment, a preset time interval is defined as one continuous duration Tr1, and the count value is integrated every time the duration Tr1 elapses after the measured temperature T reaches the integrated temperature Ts or more. To do. For this reason, in this embodiment, when the heat-generating member that is generating heat continues to contact the temperature measuring unit 130, it is determined that the temperature measuring unit 130 is under load, and every time the duration Tr1 elapses. It is possible to continue to update the cumulative number n by integrating the count value. Therefore, this integration makes it possible to evaluate the lifetime of the temperature measuring unit 130 more precisely.

  Further, in the present embodiment, when the duration time is measured and the duration time Tr1 is measured, a temperature drop determination in which the temperature drop value ΔTd of the measured temperature T that has dropped per unit time set in advance is set in advance. When the value is equal to or greater than the value Td, the measurement of the duration Tr1 is reset at that time and remeasured. For this reason, in the present embodiment, even when the temperature measured by the measurement unit 103 is equal to or higher than the integrated temperature Ts, when the heating member has already moved away from the temperature measurement unit 130, the measurement of the duration Tr1 is reset and the count value Is accumulated, the timing of updating the cumulative number n is delayed, and the cumulative number n can be updated more precisely.

  Further, in the present embodiment, when the temperature rise value ΔTu is less than the temperature rise determination value Tu and the measured temperature T is equal to or higher than the integrated temperature Ts, from the point in time when the measured temperature T reaches the integrated temperature Ts, the supercooling is performed. The high temperature duration measurement unit 212 that measures the high temperature duration Tr2 until the increased temperature falls again to the integrated temperature is further provided, and the integration unit 201 determines that the measured temperature T is the integrated temperature when the high temperature duration Tr2 has elapsed. When it is equal to or greater than Ts, the count values are integrated and the cumulative number n is updated. For this reason, in this embodiment, even if the temperature rise value ΔTu of the measured temperature T does not reach the predetermined temperature rise determination value Tu for some reason, the cumulative number n can be updated more precisely. On the other hand, there is no possibility that the cumulative number n is excessively updated based on the temperature rise caused by the supercooling.

  Further, in the present embodiment, the maximum hold is executed, the temperature related to the maximum value is specified as the measurement temperature T based on the maximum value of the detected value detected within the preset time by the measurement unit 103, and the measurement is performed. After the temperature T is specified, a preset time interval is measured as the inspection time Tr3, and the value (detection value) of the detection signal Sd detected by the measurement unit 103 and the measurement temperature are specified during the measurement of the inspection time Tr3. The measured temperature T specified by the unit 200 is compared. Here, when the detected temperature difference Tdf calculated by the temperature difference calculation unit 221 is equal to or larger than the first determination value Df set in advance, the inspection time T is reset, and the measured temperature is specified at the inspection time T reset again. The unit 200 is configured to identify the maximum value (detection value) of the detection signal Sd detected within the inspection time T. For this reason, in this embodiment, when the actual temperature change during measurement is large, the re-counting process is executed, thereby providing a function of specifying a stable value (detected value) as the measured temperature.

  In the present embodiment, the detected temperature difference Tdf is calculated, and if the detected temperature difference Tdf calculated by the temperature difference calculation unit 221 is equal to or larger than a second determination value Ds set in advance, error determination is executed. . For this reason, in this embodiment, when a temperature change occurs at a predetermined level after the measurement temperature T is determined by executing the max hold, an error determination may be performed assuming that camera shake or the like has occurred. it can. Thereby, when the measurement temperature specific | specification part 200 cannot identify suitable temperature for a certain reason, it can determine with a test | inspection defect with high precision.

  The present invention is not limited to the embodiment described above.

  For example, in the measurement mode, the specification may be such that max hold is executed. In that case, similar to the recording mode, after updating the cumulative number n at the time when the max hold is executed, a process for prohibiting further updating of the cumulative number n may be executed. On the other hand, when the max hold is executed in the measurement mode, the error determination may be executed using the error determination unit 222 or the like as in the recording mode.

  Further, when executing the max hold, when the measured temperature T is equal to or higher than the integrated temperature, the cumulative number n may be updated immediately after the max hold is executed. This is because even if a measurement error occurs, it is considered that there has been a single contact.

  In the recording mode, the max hold may be omitted.

  Further, either the measurement mode or the recording mode may be omitted.

  In addition, it goes without saying that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Temperature measuring device 11 Computer 12 Bar code reader 103 Measuring part 103a Metal wire 103b Metal wire 103c Sleeve 110 Display (an example of display means)
DESCRIPTION OF SYMBOLS 120 Control unit 122 Memory 200 Measurement temperature specific | specification part 201 Accumulation part 203 Display processing part 210 Temperature change calculation part 211 Duration measurement part 212 High temperature duration measurement part 220 Inspection time measurement part 221 Temperature difference calculation part 222 Error determination part 223 Temperature determination Part Df First determination value Ds Second determination value Fg1 Initial flag Fg2 Rapid increase flag Fg3 Decrease flag Fg4 Max hold flag Md Mode code Sd Detection signal T Measurement temperature Td Temperature decrease determination value Tdf Detection temperature difference Tn Set temperature Tr1 Duration Tr2 High temperature duration Tr3 Inspection time Ts Integrated temperature Tu Temperature rise determination value m Update count value ms Upper limit n Temperature measurement count tf Measurement value ΔTd Temperature drop value ΔTu Temperature rise value

Claims (16)

A temperature measuring unit that contacts a heat generating member that melts the solder, and a measuring unit that measures the temperature of the heat generating member through the temperature measuring unit;
An integrating unit that integrates a count value corresponding to the number of times of temperature measurement of the heating member based on the measured temperature measured by the measuring unit;
The integrating unit is a case where a temperature rise value of the measured temperature that has risen per unit time that is set in advance is equal to or higher than a preset temperature increase determination value, and the measured temperature is equal to or higher than a preset integrated temperature. A temperature measuring device that accumulates the count value when it has reached. The temperature measuring device according to claim 1,
The integrating unit integrates the count value every time a preset duration elapses after the measured temperature reaches or exceeds the integrated temperature. The temperature measuring device according to claim 2,
Further comprising a duration measuring unit for measuring the duration,
In the case where the duration measurement unit is measuring the duration, when the temperature drop value of the measurement temperature dropped per unit time set in advance is equal to or higher than a preset temperature drop determination value, the duration time is measured. A temperature measuring device characterized by resetting and re-measuring the measurement. In the temperature measuring device according to claim 2 or 3,
In the case where the temperature rise value is less than the temperature rise determination value, if the measured temperature is equal to or higher than the integrated temperature, the temperature increased by supercooling from the time when the measured temperature reaches the integrated temperature is again integrated. It further includes a high temperature duration measurement unit that measures the high temperature duration until the temperature drops,
When the high temperature duration time has elapsed and the measured temperature is equal to or higher than the integrated temperature, the integrating unit integrates the count value when the high temperature elapsed time elapses. In the temperature measuring device according to any one of claims 1 to 4,
Based on the maximum value of the detected value detected by the measurement unit within a preset time, a measurement temperature specifying unit that specifies the temperature related to the maximum value as the measurement temperature;
After the measurement temperature specifying unit specifies the measurement temperature, an inspection time measuring unit that measures a preset time interval as an inspection time;
A temperature difference calculating unit that calculates a detected temperature difference by comparing the detected value detected by the measuring unit and the measured temperature specified by the measured temperature specifying unit during the measurement of the inspection time;
When the detected temperature difference calculated by the temperature difference calculation unit is greater than or equal to a first determination value set in advance, the inspection time is reset, and the measurement temperature specifying unit uses the inspection time reset again. A temperature measuring device configured to specify a maximum value of detected values detected in the inside. In the temperature measuring device according to claim 5,
The temperature measurement device further comprising an error determination unit that executes an error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a preset second determination value. A temperature measuring unit that contacts the heat generating member that melts the solder, and a measuring unit that measures the temperature of the heat generating member;
Based on the maximum value of the detected value detected by the measurement unit within a preset time, a measurement temperature specifying unit that specifies the temperature related to the maximum value as the measurement temperature;
After the measurement temperature specifying unit specifies the measurement temperature, an inspection time measuring unit that measures a preset time interval as an inspection time;
A temperature difference calculating unit that calculates a detected temperature difference by comparing the detected value detected by the measuring unit and the measured temperature specified by the measured temperature specifying unit during the measurement of the inspection time;
When the detected temperature difference calculated by the temperature difference calculation unit is greater than or equal to a first determination value set in advance, the inspection time is reset, and the measurement temperature specifying unit uses the inspection time reset again. A temperature measuring device configured to specify a maximum value of detected values detected in the inside. The temperature measuring device according to claim 7,
The temperature measurement device further comprising an error determination unit that executes an error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a preset second determination value. In the temperature measuring method for measuring the temperature of the heat generating member that melts the solder with the temperature measuring unit of the temperature measuring device,
Based on the measured temperature measured by the temperature measuring unit, comprising an integration step of integrating a count value according to the number of times of temperature measurement of the heating member,
The integration step is a case where the temperature increase value of the measured temperature that has risen per unit time set in advance is equal to or higher than a preset temperature rise determination value, and the measured temperature is equal to or higher than a preset integrated temperature. A temperature measuring method, comprising: integrating the count value when it has reached. The temperature measurement method according to claim 9, wherein
The integrating step includes integrating the count value every time a preset duration elapses after the measured temperature reaches the integrated temperature or more. The temperature measurement method according to claim 10,
Further comprising a duration measuring step for measuring the duration,
In the duration measurement step, when the duration is measured, when the temperature drop value of the measured temperature dropped per unit time set in advance is equal to or higher than a preset temperature drop determination value, the duration time is measured. A temperature measurement method characterized by resetting and re-measurement. The temperature measurement method according to claim 10 or 11,
In the case where the temperature rise value is less than the temperature rise determination value, if the measured temperature is equal to or higher than the integrated temperature, the temperature increased by supercooling from the time when the measured temperature reaches the integrated temperature is again integrated. A high temperature duration measurement step for measuring a high temperature duration time until the temperature drops,
In the temperature measurement method, the integration step integrates the count value at the elapse of the high temperature elapsed time when the high temperature duration time has elapsed and the measured temperature is equal to or higher than the integrated temperature. The temperature measurement method according to any one of claims 10 to 12,
Based on the maximum value of the detected value detected within a preset time, a measurement temperature specifying step for specifying the temperature related to the maximum value as the measurement temperature;
After specifying the measurement temperature, an inspection time measuring step of measuring a preset time interval as an inspection time;
A temperature difference calculating step of calculating a detected temperature difference by comparing the detected value detected during measurement of the inspection time and the measured temperature specified in the measured temperature specifying step; and
When the detected temperature difference calculated in the temperature difference calculation step is equal to or larger than a first determination value set in advance, the inspection time is reset, and the inspection time is specified in the measurement temperature with the inspection time reset again. A temperature measuring method, further comprising: configured to identify a maximum value of detected values detected in the inside. The temperature measurement method according to claim 13,
An error determination step of performing error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a second determination value set in advance. In the temperature measuring method for measuring the temperature of the heat generating member that melts the solder with the temperature measuring unit of the temperature measuring device,
Based on the maximum value of the detected value detected within a preset time, a measurement temperature specifying step for specifying the temperature related to the maximum value as the measurement temperature;
After specifying the measurement temperature, an inspection time measuring step of measuring a preset time interval as an inspection time;
A temperature difference calculating step of calculating a detected temperature difference by comparing the detected value detected during measurement of the inspection time and the measured temperature specified in the measured temperature specifying step; and
When the detected temperature difference calculated in the temperature difference calculation step is equal to or larger than a first determination value set in advance, the inspection time is reset, and the inspection time is specified in the measurement temperature with the inspection time reset again. A temperature measurement method comprising: being configured to specify a maximum value of detected values detected in the inside. The temperature measurement method according to claim 15, wherein
An error determination step of performing error determination when the detected temperature difference calculated by the temperature difference calculation unit is equal to or greater than a second determination value set in advance.

Images