WO2014157138A1

WO2014157138A1 - Internal temperature measurement method and contact type internal temperature gauge

Info

Publication number: WO2014157138A1
Application number: PCT/JP2014/058185
Authority: WO
Inventors: 幸雄黒山; 菜津子北田; 松本　知子
Original assignee: シチズンホールディングス株式会社
Priority date: 2013-03-28
Filing date: 2014-03-25
Publication date: 2014-10-02
Also published as: JPWO2014157138A1; JP5956063B2

Abstract

Provided is a novel internal temperature measurement method employing a simple and low-cost structure to achieve both high speed and accuracy of measurement, the method including: a step of calculating a non-1 ratio K of thermal resistance at a heat-radiating surface of a first temperature sensor (32) and of thermal resistance at a heat-radiating surface of a second temperature sensor (33); a step of bringing about thermal contact of a heat-absorbing surface of a first temperature sensor (32) and a heat-absorbing surface of a second temperature sensor (33), against a measured surface of a measured object; a step of measuring, in a steady state, a first temperature T₁ indicating the temperature of the first temperature sensor (32) and a second temperature T₂ indicating the temperature of the second temperature sensor (33); a step of measuring an environmental temperature T_e indicating the temperature of the surroundings of the first temperature sensor (32) and the second temperature sensor (33); and a step of computing an internal temperature T_B of the measured object, from the steady-state first temperature T₁, the second temperature T₂, the environmental temperature T_e, and the ratio K.

Description

Internal temperature measurement method and contact-type internal thermometer

The present invention relates to an internal temperature measuring method and a contact type internal thermometer.

In various situations, there is a demand for measuring the internal temperature, not the surface temperature of a measurement object, quickly, accurately, and simply (ie, non-invasively). A typical example of such a requirement is measurement of body temperature of a living body including a human body. However, it is usually difficult to measure the internal temperature of the living body (sometimes referred to as deep body temperature), that is, the temperature inside the living body that is considered to be maintained at a constant temperature by the blood flow. When the measurement target is a human body, generally hold the thermometer in a place where heat is difficult to escape to the outside, such as under the tongue or under the arm, and read the thermometer after the thermometer and human body are in thermal equilibrium. However, it takes a long time of about 5 to 10 minutes until the thermal equilibrium state is obtained, and the obtained body temperature does not always match the internal temperature. For this reason, this method may be difficult to apply to subjects that are difficult to measure body temperature for a long time, such as infants and certain injuries and patients, and a highly accurate body temperature is required to perform precise body temperature management. Hard to get.

Therefore, as a thermometer for measuring the internal temperature of the human body quickly and accurately, a first temperature sensor that is in contact with the body surface and a second temperature that is disposed with a heat insulating material interposed between the first temperature sensor and the first temperature sensor. A thermometer has been proposed that includes at least two sets of sensors. In such a thermometer, in order to solve the simultaneous heat conduction equation from the temperature measurement result in each temperature sensor in the steady state and obtain the internal temperature, the heat flux passing through each set is devised so that the size of the heat flux is different. .

For example, Patent Document 1 discloses a thermometer in which the thermal resistance value of the heat insulating material in each sensor set is different.

Patent Document 2 discloses a thermometer in which a heat insulating material is further arranged between the second temperature sensor (intermediate sensor) and the outside air, and the heat resistance value of the heat insulating material is different for each sensor set. Has been.

Furthermore, Patent Document 3 discloses a thermometer in which a heat radiating plate having a different area is arranged for each set of sensors between the second temperature sensor (temperature measuring means 21, 22) and the outside air.

JP 2007-212407 A Japanese Patent No. 4798280 JP 2008-76144 A

In the above-described technology, in order to ensure sufficient measurement accuracy, it is necessary to form a heat insulating material of an appropriate material with high accuracy and to attach a temperature sensor accurately to such heat insulating material, This increases the cost.

Furthermore, in the above-described technology, the internal temperature cannot be obtained until each sensor set is in a steady state, but heat is sufficiently transmitted to the second temperature sensor through the heat insulating material, and until the steady state is reached. Since a considerable time, for example, several minutes, is required, it cannot be said that the temperature measurement is fast. Therefore, in order to shorten the time to reach a steady state, the heat capacity of each sensor set is reduced, that is, if a small one is used for each temperature sensor, the temperature difference between each temperature sensor is reduced, so the measurement accuracy is reduced. Gets worse.

The present invention has been made in view of such circumstances, and the problem to be solved is an internal temperature measurement method capable of achieving both high speed and accuracy of measurement using a simple and low-cost structure, and such a method. To provide a contact type internal thermometer using an internal temperature measuring method.

The invention disclosed in the present application in order to solve the above problems has various aspects, and the outline of typical ones of these aspects is as follows.

(1) A step of determining a ratio K that is not 1 between the heat resistance of the heat dissipation surface of the first temperature sensor and the heat resistance of the heat dissipation surface of the second temperature sensor, the heat absorption surface of the first temperature sensor, and the second temperature sensor a step of the heat absorbing surface of the temperature sensor is in thermal contact with the measurement surface of the measurement object, the temperature of the first first and the second temperature sensor of the temperature T ₁ of the the temperature of the temperature sensor in a steady state measuring a second temperature T ₂ is a step of measuring the environmental temperature T _e which is a temperature around the first temperature sensor and said second temperature sensor of the first in the steady state temperature T _1, the second temperature T _2, the internal temperature measuring method having the steps of calculating the internal temperature T _B of the measurement object from the environment temperature T _e and the ratio K.

(2) (1), the step of calculating the internal temperature _{T B,} the following equation

Internal temperature measurement method of calculating the internal temperature T _B by.

(3) a first temperature sensor having a heat absorption surface thermally coupled to a first contact surface that contacts a surface to be measured of the measurement object, a heat dissipation surface that dissipates heat in the surroundings, and the measurement object A heat absorbing surface that is thermally coupled to the second contact surface that contacts the surface to be measured, and a heat radiating surface that dissipates heat in the surroundings, and a thermal resistance for heat dissipation is different from that of the first temperature sensor. A second temperature sensor, an environmental temperature sensor for measuring an environmental temperature that is an ambient temperature of the first temperature sensor and the second temperature sensor, a thermal resistance on a heat radiation surface of the first temperature sensor, and a second And a thermal resistance ratio storage unit that stores thermal resistance or a ratio of the thermal resistance on the heat radiation surface of the temperature sensor.

(4) In (3), at least one of the first temperature sensor and the second temperature sensor is provided with at least one of a concavo-convex structure, a heat radiating plate, a heat radiating fin, and a heat insulating material. Internal thermometer.

(5) In (3) or (4), at least one of the first temperature sensor and the second temperature sensor is mounted on an FPC (flexible printed circuit board) on the heat absorption surface, and is provided on the FPC. A contact-type internal thermometer thermally coupled to one of the first contact surface and the second contact surface via a heat conductive adhesive filled in an opening exposing a portion of the endothermic surface.

(6) In (3) or (4), at least one of the first temperature sensor and the second temperature sensor is mounted on an FPC arranged parallel to the surface on a surface orthogonal to the heat absorption surface. The contact-type internal thermometer in which the endothermic surface is thermally coupled to either the first contact surface or the second contact surface directly or via a heat conductive adhesive.

(7) In (3) or (4), at least one of the first temperature sensor and the second temperature sensor is inserted into an opening provided in an FPC disposed in parallel with the endothermic surface, A contact which is mounted on the FPC on a surface orthogonal to the heat absorption surface, and the heat absorption surface is thermally coupled to either the first contact surface or the second contact surface directly or via a heat conductive adhesive. Formula internal thermometer.

(8) In (3) or (4), at least one of the first temperature sensor and the second temperature sensor is mounted on the FPC on the heat dissipation surface, and a part of the heat dissipation surface is exposed on the FPC. A contact-type internal thermometer with an opening.

(9) In any one of (3) to (8), the first temperature sensor, the second sensor, and the environmental temperature sensor are arranged in a common shielding space that shields outside air and outside light, and A contact-type internal thermometer with a ventilation mechanism that forcibly ventilates the shielding space.

(10) In (9), the ventilation mechanism includes an airflow control structure, and the airflow control structure includes an amount of airflow acting on the first temperature sensor and an amount of airflow acting on the second temperature sensor. A contact-type internal thermometer that has a different structure.

(11) (1) or (2), further comprising a step of detecting a posture of the first temperature sensor and said second temperature sensor of the step of calculating the internal temperature T _B of the object to be measured the internal temperature measurement method of calculating the internal temperature T _B based on the posture that is further detected.

(12) In (11), the step of obtaining the ratio K is a step of obtaining a value of the ratio K or a coefficient with respect to the value of the ratio K according to the postures of the first temperature sensor and the second temperature sensor. Internal temperature measurement method including.

(13) In any one of (3) to (8), further including an attitude sensor, the thermal resistance ratio storage unit is configured to determine the thermal resistance ratio value according to the attitude value detected by the attitude sensor or A contact-type internal thermometer that stores a coefficient for the value of the thermal resistance ratio.

According to the above aspect (1) or (2), the internal temperature of the measurement object can be measured while achieving both high-speed measurement and accuracy using a simple and low-cost structure.

According to the above aspect (3) or (4), a contact-type internal thermometer capable of measuring the internal temperature of the measurement object while obtaining both high speed and accuracy of measurement using a simple and low-cost structure is obtained. It is done.

According to the above aspect (5), the thickness of the heat conductive adhesive can be easily controlled to be constant. Further, the heat flow rate passing through the temperature sensor is not hindered by the FPC.

According to any one of the above aspects (6) to (8), the heat flow rate passing through the temperature sensor is not hindered by the FPC.

According to the above aspect (9), it is possible to eliminate measurement errors due to external light and external airflow, and to maintain measurement accuracy even during continuous measurement.

According to the above aspect (10), the thermal resistance of the first temperature sensor and the second temperature sensor can be made different due to ventilation.

According to the above aspect (11) or (12), when measuring the internal temperature of the measurement object, high-precision measurement can be performed regardless of the posture during measurement.

According to the side of (13) above, highly accurate measurement can be performed regardless of the attitude of the contact-type internal thermometer at the time of measurement.

It is the external view which looked at the contact-type internal thermometer which concerns on the 1st Embodiment of this invention from the back side. It is the external view which looked at the contact-type internal thermometer which concerns on the 1st Embodiment of this invention from the measurement surface side. FIG. 3 is a schematic sectional view of a contact-type internal thermometer taken along line III-III in FIG. 1. It is a figure which shows the equivalent thermal circuit of the measurement part provided in the measurement head of the contact-type internal thermometer which concerns on the 1st Embodiment of this invention. It is an external appearance perspective view which shows an example of a 1st temperature sensor. It is an external appearance perspective view which shows another example of a 1st temperature sensor. It is an external appearance perspective view which shows another example of a 1st temperature sensor. It is an external appearance perspective view which shows an example of a 2nd temperature sensor. It is an external appearance perspective view which shows another example of a 2nd temperature sensor. It is an external appearance perspective view which shows an example of a mode that the 1st temperature sensor or the 2nd temperature sensor is mounted in FPC. It is sectional drawing in the VIIB-VIIB line | wire of FIG. 7A. It is an external appearance perspective view which shows another example of a mode that the 1st temperature sensor or the 2nd temperature sensor is mounted in FPC. It is sectional drawing in the VIIIB-VIIIB line | wire of FIG. 8A. It is an external appearance perspective view which shows another example of a mode that the 1st temperature sensor or the 2nd temperature sensor is mounted in FPC. FIG. 9B is a sectional view taken along line IXB-IXB in FIG. 9A. It is an external appearance perspective view which shows another example of a mode that the 1st temperature sensor or the 2nd temperature sensor is mounted in FPC. FIG. 10B is a sectional view taken along line XB-XB in FIG. 10A. It is a figure which shows an example of the ventilation mechanism which makes the thermal resistance in the thermal radiation surface of a 1st temperature sensor and a 2nd temperature sensor differ. It is a schematic sectional drawing of the contact-type internal thermometer which concerns on the 2nd Embodiment of this invention. It is a figure which shows the case where the normal line direction of the measurement surface of a contact-type internal thermometer corresponds with the perpendicular downward direction (gravity direction). It is a figure which shows the case where the normal line direction of the measurement surface of a contact-type internal thermometer is a horizontal direction. It is explanatory drawing showing the attitude | position of a contact-type internal thermometer by angle ((theta), (delta)). It is an example of a two-dimensional table showing the relationship between angles (θ, δ) and K.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a contact type internal thermometer 100 according to the first embodiment of the present invention viewed from the back side, and FIG. 2 is a view of the contact type internal thermometer 100 according to the same embodiment from the measurement surface side. It is an external view. In the present specification, the contact-type internal thermometer is a thermometer, and means a thermometer that measures the internal temperature by bringing it into contact with the surface to be measured. In addition, the internal temperature means not the surface temperature of the measurement target but the temperature inside the region that is considered to be a substantially constant temperature heat source. Here, it is considered that the heat source is substantially constant temperature when the heat capacity inside the measurement target is large, or when heat is constantly supplied to the measurement target, the measurement with the contact-type internal thermometer is practically applied to that temperature. It means that it is considered that there is no influence. For example, when the measurement target is a living body, heat is always supplied from the trunk by the blood flow, which corresponds to the latter.

The contact-type internal thermometer 100 shown in the present embodiment is portable as shown in the figure, and the measurement head 2 is attached to the tip of the case 1. The measuring head 2 is provided so as to protrude from the case 1, and the tip thereof is a substantially flat measuring surface 20. Then, the internal surface is measured by pressing the measurement surface 20 against the surface to be measured of the measurement object, for example, the skin. On the surface of the measurement surface 20, a substantially circular first probe 30 and second probe 31 are arranged in series along the longitudinal direction of the contact-type internal thermometer 100 as shown in FIG. 2. The arrangement of the first probe 30 and the second probe 31 is arbitrary, and the arrangement direction is not necessarily along the longitudinal direction of the contact-type internal thermometer 100.

A lamp 11, a display unit 12, and a buzzer 13 are provided on the back surface 10 that is the surface opposite to the measurement surface 20 of the case 1. Hereinafter, in this specification, the direction in which the measurement surface 20 faces is referred to as the measurement surface side, and the direction in which the back surface 10 that is the opposite direction faces is referred to as the back surface side. Further, the case 1 has a long and rounded shape, and forms a grip 14 that the user has in his hand. As shown in FIG. 2, a battery lid 15 is provided on the measurement surface side of the grip 14 of the case 1, and a battery serving as a power source for the contact type internal thermometer 100 is accommodated therein. In addition, an intake hole 16 is provided at an appropriate position of the case 1, here the position shown in FIG. 2, and an exhaust hole 21 is provided on the side surface of the measurement head 2, so that each internal space communicates with the outside air. . Case 1 and measuring head 2 are connected by a support ring 3.

The design of the contact type internal thermometer 100 shown in FIGS. 1 and 2 is an example. Such a design may be appropriately changed in consideration of its main use and marketability. Further, the arrangement of each component may be arbitrarily selected within a range that does not impair its function.

FIG. 3 is a schematic cross-sectional view of the contact-type internal thermometer 100 taken along line III-III in FIG. The case 1 is preferably a hollow molded product made of any synthetic resin such as ABS resin, and various parts constituting the contact-type internal thermometer 100 are integrally accommodated therein. A battery 4 and a circuit board 5 are accommodated in the grip 14. Various electronic components such as a controller 50 and a non-volatile memory 51 are mounted on the circuit board 5, and are supplied with power from the battery 4 to all components that require power. The power is supplied and the operation is controlled. The illustrated battery 4 is a commercially available AAA type (referred to as AAA in the United States) dry battery, but the type thereof may be arbitrary, such as a button type or a square type, or a primary type. The battery and secondary battery may be optional. Note that wiring for electrically connecting each component and the circuit board 5 is omitted because the illustration is complicated. The controller 50 is an appropriate information processing apparatus, and is a computer (CPU) (Central Processing Unit) and a memory, a so-called microcontroller, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), or other PLD (Programmable). (Logic Device) or the like may be used.

The lamp 11 is preferably a light emitting diode capable of emitting multiple colors, and is lit to notify the user of the state of the contact type internal thermometer 100. The display unit 12 is a liquid crystal display device in the present embodiment, and is used to notify the user of the measurement result of the contact-type internal thermometer 100 in a manner as shown in FIG. Of course, any other information such as the remaining amount of the battery 4 may be displayed on the display unit 12. Alternatively, the state of the contact type internal thermometer 100 may be displayed together and the lamp 11 may be omitted. The buzzer 13 is a general electronic buzzer in this embodiment, and is for notifying the user of the state of the contact-type internal thermometer 100 by a beep sound. The form of the buzzer 13 is also arbitrary, and a speaker may be provided to notify by voice or melody. Alternatively, the buzzer 13 may be omitted only for notification by the lamp 11 and / or the display unit 12.

Further, a partition wall 18 is provided inside the case 1, and the inside of the case 1 is partitioned into a grip space 19a and a head space 19b. The partition wall 18 is provided with an opening, and the blower 7 is attached so as to close the opening. The function of the blower 7 will be described later.

The measuring head 2 is attached to the tip of the case 1 through a support ring 3. The support ring 3 is preferably made of a material having elasticity such as silicon rubber or a foam thereof and excellent in heat insulation, and allows a slight movement of the measuring head 2 with respect to the case 1 and from the measuring head 2 to the case. The heat transfer to 1 is cut off. This is because when the measurement surface 20 is pressed against the measurement object, in particular, the first probe 30 and the second probe 31 on the measurement surface 20 are in close contact with the measurement object, and from the measurement head 2. This is to prevent the occurrence of measurement errors due to heat flowing out to case 1. However, the support ring 3 is not an essential configuration, there is no problem in the close contact between the measurement surface 20 and the measurement object, and when the measurement head 2 is a material having a sufficiently low thermal conductivity and there is no practical problem, This may be omitted, and the measurement head 2 may be directly fixed to the case 1 or both may be integrally formed. Further, the shape of the support ring 3 is not limited to an annular shape, and an arbitrary shape may be used.

The measuring head 2 is preferably formed of a material having a stable shape, low thermal conductivity and low specific heat. For example, rigid foamed urethane or rigid foamed vinyl chloride is suitably used. However, the material is not particularly limited in this respect as long as there is no practical problem, and any material may be used.

The measurement surface 20 of the measurement head 2 is provided with openings at positions corresponding to the first probe 30 and the second probe 31, and each probe is attached so as to slightly protrude from the measurement surface 20. Therefore, when the measurement surface 20 is pressed against the surface to be measured, the first contact surface that is the surface on the measurement surface side of the first probe 30 and the second contact that is the surface on the measurement surface side of the second probe 31. The surfaces come into close contact with the surface to be measured, and heat is transferred between them. Here, the contact surface refers to a surface that is in contact with the surface to be measured and mainly transfers heat. Each probe is preferably made of a material having high thermal conductivity, and is made of metal in this embodiment. In addition, it is preferable that the material of the 1st probe 30 and the 2nd probe 31 is equipped with corrosion resistance, and aluminum and stainless steel are suitable for a metal material. As described above, since the measurement head 2 itself is made of a material having low thermal conductivity, the first probe 30 and the second probe 31 are thermally isolated from each other.

The first temperature sensor 32 is provided on the back surface of the first probe 30, and both are thermally coupled to each other. A second temperature sensor 33 is provided on the rear surface of the second probe 31, and both are thermally coupled to each other. In addition, an environmental temperature sensor 34 for measuring the ambient temperature is provided at an arbitrary position on the back side away from the first temperature sensor 32 and the second temperature sensor 33. Although the support structure for the ambient temperature sensor 34 is not shown in FIG. 3, any structure may be used. For example, the measurement head 2 or the case 1 may be provided with an appropriate structure such as a beam, and the environmental temperature sensor 34 may be fixed, or the first temperature sensor 32 and / or the second temperature sensor 33 may be mounted. By mounting the environmental temperature sensor 34 at an appropriate position of the FPC, the environmental temperature sensor 34 may be arranged at an appropriate position in the head space 19b. The head space 19b is a shielding space that shields light (external light) and airflow (external airflow) outside the contact-type internal thermometer 100, and includes a first temperature sensor 32, a second temperature sensor 33, and an environmental temperature sensor. 34 is arranged in a head space 19b which is a common shielding space.

In such a structure, when the measurement surface 20 is brought into contact with the measurement object, the heat from the measurement object is transferred to the contact surface of the first probe 30 and the contact surface of the second probe 31, and further, the heat is the first. The first temperature sensor 32 and the second temperature sensor 33 are transmitted to the first temperature sensor 32 and the second temperature sensor 33, and after passing through the first temperature sensor 32 and the second temperature sensor 33 to the back side, are diffused into the head space 19b. Here, if the surface on the measurement surface 20 side of the first temperature sensor 32 and the second temperature sensor 33 is called an endothermic surface, the endothermic surface of the first temperature sensor 32 is the same as that of the first probe 30 and the heat. As a result, the thermal contact with the contact surface results. Similarly, the endothermic surface of the second temperature sensor 33 is thermally coupled to the contact surface of the second probe 31. The heat of the measurement object transmitted to each contact surface flows into the first temperature sensor 32 and the second temperature sensor 33 from the endothermic surface. In addition, since the back surfaces of the first temperature sensor 32 and the second temperature sensor 33 are surfaces that dissipate heat in the head space 19b, these surfaces are referred to as heat dissipation surfaces.

In addition, although what kind of thing may be used for each temperature sensor, in this embodiment, it is a thermistor. Each temperature sensor is connected to the circuit board 5 by wiring (not shown), in this embodiment, FPC, and the controller 50 can detect the temperature of each temperature sensor.

Here, the thermal resistance of the heat radiation surface of the first temperature sensor 32 and the thermal resistance of the heat radiation surface of the second temperature sensor 33 are different. Therefore, the value of the ratio of the two thermal resistances is naturally not 1. A structure for making the thermal resistance of the heat radiation surface of the first temperature sensor 32 different from the heat resistance of the heat radiation surface of the second temperature sensor 33 will be described later. The first temperature sensor 32 and the second temperature sensor 33 may have the same size and shape.

Here, the measurement principle of the internal temperature by the contact-type internal thermometer 100 of this embodiment will be described with reference to FIG.

FIG. 4 is a diagram showing an equivalent thermal circuit of the measurement unit provided in the measurement head 2 of the contact-type internal thermometer 100 according to the present embodiment. To explain with reference to FIG. 4 to FIG, T _B is the internal temperature of the measurement target, T ₁ is the temperature of the first temperature sensor 32, T ₂ is the temperature of the second temperature sensor 33, T _e is the environmental temperature This is the temperature of the sensor 34. The heat resistance R _B is from the interior of the constant temperature heat source to be measured first probe 30 and second probe 31, further first through the heat absorbing surface of the first temperature sensor 32 and second temperature sensor 33 It is a thermal resistance when heat is transmitted to the temperature sensor 32 and the second temperature sensor 33. _Te is the temperature of the environmental temperature sensor 34 and indicates the temperature of the environment around the first temperature sensor 32 and the second temperature sensor 33. The thermal resistance R ₁ is a thermal resistance when heat is dissipated from the heat radiation surface of the first temperature sensor 32 to the surrounding environment, and the thermal resistance R ₂ is a heat resistance R ₂ from the heat radiation surface of the second temperature sensor 33 to the surrounding environment. It is the thermal resistance when heat is dissipated. Further, T _B > T ₁ > T _e and T _B > T ₂ > T _e are established.

Here, consider the case in the system is steady state shown in FIG., The heat flux flowing into T ₁ than T _B is is constant, the following equation is established.

Similarly, given the heat flux flowing into T ₂ than T _B,

Is established. Solving this equation 2 and equation 3 for _{T B,}

As required. Here, K is a ratio of the thermal resistance R ₁ and the thermal resistance R ₂ and is a constant other than 1, and is obtained in advance by experiments or the like. In Equation 4, the ratio K is R ₂ / R ₁ .

In the case where the internal temperature is measured by the above method, it is not necessary to use a laminated structure with a heat insulating material as the first temperature sensor 32 and the second temperature sensor 33, so that the manufacturing is easy and the cost is low. It becomes. Further, since the first temperature sensor 32 and the second temperature sensor 33 may be a single element as a temperature sensor, the heat capacity is small, and the time until a steady state is reached is short. Furthermore, since the temperature difference in the steady state between the first temperature sensor 32 and the second temperature sensor 33 can be easily controlled by applying various structures to be described later, the first temperature sensor 32 and the second temperature sensor 33. It is easy to maintain the measurement accuracy even when a small size is used to increase the measurement speed.

Subsequently, a procedure for measuring the internal temperature using the contact-type internal thermometer 100 according to the present embodiment will be described.

Step 1: determine the specific K the thermal resistance R ₁ and the thermal resistance R _2, is stored in the nonvolatile memory 51 is a thermal resistance ratio storage unit. The ratio K is, for example, the first probe 30 and second probe 31 in a thermostat and the like is brought into contact with thermostatic heat source with a known temperature, to actually measure the temperature T _1, T ₂ and T _e Thus, it can be easily obtained from the above-described Expression 2 and Expression 3. The value stored in the nonvolatile memory 51 may be the ratio K itself or the thermal resistances R ₁ and R ₂ . Since this procedure only needs to be performed once after the contact-type internal thermometer 100 is manufactured, for example, it may be performed in a factory before shipment. The user of the contact-type internal thermometer 100 does not need to execute the procedure 1 for each measurement, and may perform the following procedure 2 and subsequent steps.

Procedure 2: The measurement surface 20 of the contact-type internal thermometer 100 is brought into contact with the measurement object, and measurement is started. This measurement may be started automatically by detecting an increase in temperature measured by the first temperature sensor 32 or the second temperature sensor 33, or a switch such as a push button (not shown) may be used. You may carry out by a user's operation. At this time, the controller 50 notifies the user that the measurement is started by a beep sound by the buzzer 13. At the same time, the lamp 11 is lit in an arbitrary color, for example, red, and prompts the user to keep the measurement surface 20 in contact with the measurement object.

Procedure 3: Ventilate the head space 19b. After starting the measurement, the controller 50 operates the blower 7 to ventilate the head space 19b. This is because the temperature around the first temperature sensor 32 or the second temperature sensor 33 rises locally due to the heat transferred from the measurement object, or the temperature T _{e of the} environmental sensitivity sensor becomes different. This is to prevent an error from occurring due to a difference from the above.

In this embodiment, the blower 7 forcibly generates an airflow flowing from the grip space 19a to the head space 19b in FIG. Therefore, the air flow induced by the blower 7 is sucked from the intake hole 16 as shown by an arrow in the figure, passes through the blower 7, and passes through the vicinity of the first temperature sensor 32 and the second temperature sensor 33. It passes through and is discharged from the exhaust hole 21. Therefore, the blower 7, the intake hole 16, and the exhaust hole 21 of the present embodiment cooperate to constitute a ventilation mechanism that ventilates the head space 19b.

Note that any configuration of the ventilation mechanism may be used, and the arrangement of the blower 7, the intake hole 16, and the exhaust hole 21 is arbitrary. Further, the direction of intake and exhaust may be reversed. The type of the blower 7 is not particularly limited, and may be a general fan or a micro blower using a piezoelectric element. Alternatively, when sufficient measurement accuracy is obtained by ventilation by natural convection, and furthermore, the amount of heat flowing through the first temperature sensor 32 and the second temperature sensor 33 with respect to the heat capacity of the head space 19b is sufficiently small and ignored. If possible, the ventilation mechanism itself can be eliminated and step 3 can be omitted.

Step 4: The controller 50 calculates the internal temperature T _B of the measurement object after the first temperature sensor 32 and second temperature sensor 33 has reached a steady state, and displays. That is, the controller 50 monitors the outputs of the first temperature sensor 32 and the second temperature sensor 33, and uses the outputs when the temperature changes of these temperature sensors are equal to or lower than a predetermined threshold value, as described above. determining the internal temperature _{T B} from Equation 4. Number 4 As is clear from the controller 50, the temperature _{T 1} of the first temperature sensor 32 in the steady state, the temperature _{T 2} of the second temperature sensor 33, the temperature _{T e} of the environmental temperature sensor 34 and a non-volatile memory, than the stored ratio K 51 calculates the internal temperature T _B to be measured. The internal temperature T _B which is calculated is displayed on the display unit 12 as shown in FIG. Further, the user is notified that the measurement is completed by generating a beep sound by the buzzer 13 and lighting the lamp 11 in an arbitrary color different from the previous color, for example, green. The internal temperature T _B which is calculated, in the present embodiment is set to be notified to the user by displaying on the display unit 12 is not limited to this, accumulated in a memory provided in contact inside thermometer 100 Or may be output to a device outside the contact-type internal thermometer 100 by wire or wirelessly. In this case, the display unit 12 is not necessarily an essential configuration.

In the above description, various notifications of measurement start and measurement end to the user are all performed by a beep sound by the buzzer 13 and lighting of the lamp 11, but these notification methods are limited to those exemplified here. Not. In particular, the beep sound may be omitted, or may not be uttered according to user settings. It is preferable to perform various notifications to the user only by lighting the lamp 11 without using sound, for example, when the measurement target is a sleeping baby, measurement is possible without disturbing the infant's sleep, etc. There is a case. Of course, how the lamp 11 is turned on, for example, how to select the emission color is arbitrary. In addition, various notifications are made to the user by flashing the lamp 11, changing the intensity of the emitted light, or providing a plurality of lamps 11 and changing the number and positions of the lamps 11 regardless of the colored light. It may be. Further, as described above, various notifications may be given to the user by the display unit 12 instead of the lamp 11.

Then, the structure for making the thermal resistance in the thermal radiation surface of the 1st temperature sensor 32 of this embodiment and the 2nd temperature sensor 33 different is demonstrated. In the following description, as an example, it is assumed that the thermal resistance R ₁ in the first temperature sensor 32 is smaller than the thermal resistance R ₂ in the second temperature sensor 33, but this may be reversed. .

FIG. 5A is an external perspective view showing an example of the first temperature sensor 32. In the illustrated example, the bottom surface of the first temperature sensor 32 is a heat absorbing surface 36, and the upper surface on the opposite side is a heat radiating surface 37. Moreover, the terminal 35 is provided in the opposing side surface. As shown in the figure, the heat radiating surface 37 of the first temperature sensor 32 is assumed and irregular structure of the fin is provided to increase the surface area of the heat radiation surface 37, less the thermal resistance R _1. Such a concavo-convex structure is a process of manufacturing the first temperature sensor 32 by partially removing one surface of the first temperature sensor 32 by, for example, cutting with a dicing saw or by laminating green sheets. It is obtained by making it in. Further, the concavo-convex structure is not limited to the fin-like shape shown here, but may be a pin-like structure, for example.

FIG. 5B is an external perspective view showing another example of the first temperature sensor 32. In the illustrated example, a heat radiating plate 38 having a good thermal conductivity such as metal is attached to the heat radiating surface 37 of the first temperature sensor 32. In this way it is also possible to reduce the thermal resistance R ₁ of the radiating surface 37.

FIG. 5C is an external perspective view showing still another example of the first temperature sensor 32. In the illustrated example, a heat radiating fin 39 made of a material having good thermal conductivity such as metal is attached to the heat radiating surface 37 of the first temperature sensor 32. In this way it is also possible to reduce the thermal resistance R ₁ of the radiating surface 37.

FIG. 6A is an external perspective view showing an example of the second temperature sensor 33. In the illustrated example, the bottom surface of the second temperature sensor 33 is a heat absorbing surface 36, and the upper surface on the opposite side is a heat radiating surface 37. Moreover, the terminal 35 is provided in the opposing side surface. The radiating surface 37 of the second temperature sensor 33 is covered by a suitable insulation 40, and increases the thermal resistance R _2. The material and thickness of the heat insulating material 40 are preferably set so as not to significantly disturb the heat flux passing through the second temperature sensor 33. For example, an appropriate organic material such as a photoresist material may be coated.

FIG. 6B is an external perspective view showing another example of the second temperature sensor 33. In the illustrated example, a heat insulating material 41 is partially provided on the heat radiating surface 37 of the second temperature sensor 33. In this case, the heat insulating material 41 may use a material having high heat insulating performance, for example, a foam of various synthetic resins. When the heat insulating performance of the heat insulating material 41 is sufficiently high, the value of the thermal resistance R ₂ can be controlled by the covering area of the heat insulating material 41 occupying the heat radiating surface 37. Roughly speaking, the value of the thermal resistance R ₂ is inversely proportional to the ratio of covering the area of the heat radiation surface 37 with the heat insulating material 41.

Either or both of the first temperature sensor 32 and the second temperature sensor 33 adopt the structure shown in FIGS. 5A to 5C and FIGS. The ratio K may be a value other than 1.

Incidentally, in the present embodiment, the first temperature sensor 32 and the second temperature sensor 33 are thermistors. A small-sized temperature sensor such as a thermistor is a rectangular parallelepiped whose outer shape is generally flat, and a surface having the smallest area facing each other is often a terminal. And, like the contact type internal thermometer 100 according to the present embodiment, when one surface of the temperature sensor is used as the heat absorbing surface and the other surface is used as the heat radiating surface, the heat resistance at the heat absorbing surface and the heat radiating surface is It is desirable to use the opposite surfaces having the largest area as the heat absorbing surface and the heat radiating surface, respectively, so as to be small.

That is, one of the opposed surfaces of the rectangular parallelepiped temperature sensor must be thermally coupled to the first probe 30 or the second probe 31, and the other of the opposed surfaces needs to be a heat dissipation surface that radiates heat to the atmosphere. There is. For this reason, it is not possible to simply use one of the surfaces having the largest area of the temperature sensor and mount it on the FPC, and some ingenuity is required to mount the first temperature sensor 32 and the second temperature sensor 33. It is.

FIG. 7A is an external perspective view showing an example of a state in which the first temperature sensor 32 or the second temperature sensor 33 is mounted on the FPC 42. The temperature sensor shown in the figure may be either the first temperature sensor 32 or the second temperature sensor 33, but in the following description, the first temperature sensor 32 will be described as a representative. Further, in this drawing, illustration of appropriate heat dissipation structure and heat insulation structure on the heat dissipation surface 37 is omitted. In this example, the first temperature sensor 32 is mounted such that the heat absorption surface 36 is in contact with the FPC 42, and the FPC 42 is electrically connected by the solder 43 on the side of the terminal 35 on the heat absorption surface 36 side. . The FPC 42 is disposed in parallel with the heat absorbing surface 36.

FIG. 7B is a cross-sectional view taken along the line VIIB-VIIB in FIG. 7A. As shown in the figure, an opening 42a slightly smaller than the endothermic surface 36 is provided on the surface facing the endothermic surface 36 of the FPC 42, and a part of the endothermic surface 36, in this case, most of the measurement surface is provided. It is designed to be exposed to the side. A heat conductive adhesive 44 is filled between the heat absorbing surface 36 and the first probe 30 (or the second probe 31; hereinafter, represented by the first probe 30). The heat absorbing surface 36 and the first probe 30 are thermally coupled to each other.

In this way, by providing the opening 42a in the FPC 42, partially covering the heat-absorbing surface 36, and exposing a part thereof, the FPC 42 does not interfere with the heat flux on the heat-absorbing surface 36. Can do. Further, since the FPC 42 functions as a spacer that determines the gap between the heat absorbing surface 36 and the back surface of the first probe 30, the thickness of the heat conductive adhesive 44 can be easily kept constant.

FIG. 8A is an external perspective view showing another example of a state in which the first temperature sensor 32 (or the second temperature sensor 33) is mounted on the FPC. Also in this figure, illustration of an appropriate heat dissipation structure and heat insulation structure on the heat dissipation surface 37 is omitted. In this example, the first temperature sensor 32 is inserted into the opening 42 a provided in the FPC 42, and the terminal 35 provided on the surface orthogonal to the heat absorption surface 36 is electrically connected to the FPC 42 by the solder 43 in the middle of the surface. Connection is established. The FPC 42 is disposed in parallel with the heat absorbing surface 36.

FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8A. As shown in the figure, the opening 42 a provided in the FPC 42 is slightly larger than the outer diameter of the first temperature sensor 32. Further, a heat transfer adhesive 44 is filled between the heat absorption surface 36 and the first probe 30 (or the second probe 31), and the heat absorption surface 36 and the first probe 30 are interposed via the heat transfer adhesive 44. Are thermally coupled. Even if it does in this way, it can be set as the structure which FPC42 does not prevent the heat flux in the endothermic surface 36. FIG.

FIG. 9A is an external perspective view showing still another example of a state in which the first temperature sensor 32 (or the second temperature sensor 33) is mounted on the FPC. Also in this figure, illustration of an appropriate heat dissipation structure and heat insulation structure on the heat dissipation surface 37 is omitted. In this example, the first temperature sensor 32 is mounted such that a surface orthogonal to the heat absorption surface 36 is in contact with the FPC 42, and soldering is performed on a side orthogonal to the heat absorption surface 36 of the terminal 35 (side in the drawing). 43 is electrically connected to the FPC 42.

FIG. 9B is a cross-sectional view taken along line IXB-IXB in FIG. 9A. As shown in the figure, the FPC 42 is orthogonal to the heat radiating surface 37 and the heat absorbing surface 36, and is arranged so as not to hit the first probe 30 (or the second probe 31). Further, a heat transfer adhesive 44 is filled between the heat absorption surface 36 and the first probe 30, and the heat absorption surface 36 and the first probe 30 are thermally coupled via the heat transfer adhesive 44. Even if it does in this way, it can be set as the structure which FPC42 does not prevent the heat flux in the endothermic surface 36. FIG.

FIG. 10A is an external perspective view showing still another example of a state in which the first temperature sensor 32 (or the second temperature sensor 33) is mounted on the FPC. Also in this figure, illustration of an appropriate heat dissipation structure and heat insulation structure on the heat dissipation surface 37 is omitted. In this example, the first temperature sensor 32 is mounted such that the heat radiation surface 37 is in contact with the FPC 42. Electrical connection between the terminal 35 and the FPC 42 is made on the surface of the FPC 42 on the measurement surface side. Further, an opening 42a that is slightly smaller than the heat dissipation surface 37 is provided on the surface of the FPC 42 that faces the heat dissipation surface 37, and a part of the heat dissipation surface 37, in this case, most of the surface is exposed to the back side. Yes. The FPC 42 is disposed in parallel with the heat dissipation surface 37.

FIG. 10B is a cross-sectional view taken along line XB-XB in FIG. 10A. As shown in the figure, the FPC 42 is electrically connected to the terminal 35 and the solder 43 on the back side thereof. Further, a heat transfer adhesive 44 is filled between the heat absorption surface 36 and the first probe 30 (or the second probe 31), and the heat absorption surface 36 and the first probe 30 are interposed via the heat transfer adhesive 44. Are thermally coupled. In such a structure, it can be set as the structure which FPC42 does not prevent the heat flux in the thermal radiation surface 37. FIG.

In the above description, as a method for differentiating the thermal resistances on the heat radiation surfaces of the first temperature sensor 32 and the second temperature sensor 33, FIGS. 5A to 5C and FIGS. The structure shown in 6B was used. However, in place of or in addition to such a structure, it is possible to make the thermal resistances of the heat radiation surfaces of the first temperature sensor 32 and the second temperature sensor 33 different by using the ventilation mechanism described above. is there.

FIG. 11 is a diagram showing an example of a ventilation mechanism in which the thermal resistances on the heat radiation surfaces of the first temperature sensor 32 and the second temperature sensor 33 are different. This figure is a cross-sectional view of the contact-type internal thermometer 100 corresponding to FIG. 3 already described, and the reference numerals attached in the figure indicate the same as those already described.

In the ventilation mechanism in the example shown in FIG. 11, the number of exhaust holes 21 provided in the measurement head 2 is different between the first temperature sensor 32 side and the second temperature sensor 33 side. As shown in the figure, three rows of exhaust holes 21 are provided on the first temperature sensor 32 side, whereas there are only one row of exhaust holes 21 on the second temperature sensor 33 side. Therefore, when forced ventilation by the blower 7 is performed, as indicated by the thick arrows in the figure, the airflow flows more to the first temperature sensor 32 side, and the airflow is relatively less on the second temperature sensor 33 side. . In addition, the thickness of the thick arrow in a figure has shown the quantity of the airflow typically. In such a situation, forced convection heat transfer occurs strongly on the first temperature sensor 32 side, and as a result, the heat transfer coefficient at the heat radiating surface is further increased. As a result, the heat resistance is the heat resistance of the second temperature sensor 33. Smaller than.

As described above, the thermal resistances on the heat radiation surfaces of the first temperature sensor 32 and the second temperature sensor 33 can be made different by using the ventilation mechanism. More specifically, the ventilation mechanism is provided with an airflow control structure for controlling the amount of airflow directed toward the first temperature sensor 32 and the amount of airflow directed toward the second temperature sensor 33, and the first temperature The amount of airflow acting on the sensor 32 side may be different from the amount of airflow acting on the second temperature sensor 33. In the example shown in FIG. 11, the exhaust hole 21 provided asymmetrically on the first temperature sensor 32 side and the second temperature sensor 33 side corresponds to the airflow control structure. Various airflow control structures may be used, such as providing a different pressure loss in the airflow passage toward the first temperature sensor 32 side and the second temperature sensor 33 side.

By the way, as described above, the ventilation mechanism is omitted, the head space 19b is a closed space or a semi-closed space, and heat flows into the head space 19b from the first temperature sensor 32 and the second temperature sensor 33 naturally. Considering the case of convection, in general, in the case of natural convection, the heat exchange is performed by the warmed air flowing vertically upward, so the attitude of the contact-type internal thermometer 100 can affect the measurement accuracy. There is sex. That is, since the relative direction of the airflow rising from the first temperature sensor 32 and the second temperature sensor 33 changes depending on the posture at the time of temperature measurement by the contact type internal thermometer 100, the convection aspect in the head space 19b. Therefore, the value of K in the above equation 4 has posture (that is, angle) dependency.

FIG. 12 is a schematic sectional view of a contact-type internal thermometer 200 according to the second embodiment of the present invention. This figure shows a cross-section corresponding to FIG. 3 in the previous embodiment, and the appearance of the contact-type internal thermometer 200 is the same as that of the previous embodiment, so FIG. 1 and FIG. Uses this as what concerns this embodiment. Further, the measurement principle of the internal temperature in the contact-type internal thermometer 200 is the same as that of the previous embodiment. Moreover, in the member which comprises the contact-type internal thermometer 200, the same code | symbol is attached | subjected about the thing similar to previous embodiment, and the overlapping description shall be abbreviate | omitted.

As shown in the figure, in the contact-type internal thermometer 200, the partition wall 18 completely separates the grip space 19a and the head space 19b, and the exhaust holes and intake air seen in the previous embodiment are also shown. Since the hole and the blower are not provided, the head space 19b is a closed space.

Here, the closed space refers to a space partitioned from the external space so that the gas inside the space cannot be exchanged with the outside air. The semi-enclosed space means that the gas inside the space is exchanged with the outside air, but the behavior of the gas inside the space is not affected by the flow of the outside air, and is due to the thermal convection of the inside gas. A space that is partitioned from the external space to be controlled. The semi-enclosed space has a large flow resistance with the outside air by, for example, making the opening for ventilation that circulates to the outside air with a small diameter, inserting a porous body, or so-called labyrinth structure. This can be easily realized. The head space 19b of this embodiment is a closed space, but this may be a semi-closed space.

Further, an attitude sensor 52 is provided on the circuit board 5. This attitude sensor 52 detects the inclination of the contact-type internal temperature 200 with respect to the vertical direction. The type of the sensor used as the attitude sensor 52 is not particularly limited. For example, by detecting the gravitational acceleration direction using an acceleration sensor or by detecting the geomagnetic direction using a geomagnetic sensor, the contact-type internal temperature 200 can be changed. The inclination with respect to the vertical direction can be detected. Further, the position where the attitude sensor 52 is provided is not necessarily on the circuit board 5, and may be an arbitrary position of the contact type internal temperature 200.

Here, as shown in FIG. 13A, when the normal direction of the measurement surface 20 of the contact-type internal thermometer 200 coincides with the vertically downward direction (gravity direction), the first temperature sensor 32 and the second temperature sensor 32. The air currents rising from the temperature sensor 33 flow as indicated by thick arrows in the figure and hardly interfere with each other. On the other hand, as shown in FIG. 13B, when the normal direction of the measurement surface 20 of the contact-type internal thermometer 200 is the horizontal direction, the first temperature sensor 32 and the second temperature sensor 33 The rising airflow is considered to flow as shown by the thick arrows in the figure. In the example shown in the figure, the airflow rising from the second temperature sensor 33 flows to the vicinity of the first temperature sensor 32. As a result, the flow of the airflow rising from the first temperature sensor 32 is hindered. heat transfer rate from the first temperature sensor 32 to the outside air is decreased, the value of the apparent thermal resistance R ₁ increases in FIG. 4, is the effective value of K in equation 4 from changing.

The change in the heat transfer rate from the first temperature sensor 32 to the outside air and the heat transfer rate from the second temperature sensor 33 to the outside air, that is, the change in the value of K is caused by the head space 19b being a closed space or a semi-closed space. Since only thermal convection needs to be taken into consideration, it is considered to depend on the attitude of the contact-type internal thermometer 200. However, since the change in the value of K depends on the shape of the head space 19b and the arrangement of the first temperature sensor 32 and the second temperature sensor 33, the change is predicted in advance using a general formula or the like. Is usually difficult.

Therefore, in the contact internal thermometer 200, the relationship between the attitude of the contact internal thermometer 200 and the value of K is measured in advance, and the specific value is stored in the nonvolatile memory 51 as a table. Then, the controller 50, at step 4 in the previous embodiment, when obtaining the internal temperature T _B from Equation 4, to detect the posture of the contact type internal thermometer 200 to the attitude sensor 52, corresponding to the detected posture read from the nonvolatile memory 51 the value of K to determine the internal temperature T _B using such K. In this way, by correcting the measurement error due to the change in the posture of the contact type internal thermometer 200, it can be more accurate measurement of the internal temperature T _B at any position.

The posture detected by the posture sensor 52 can be generally expressed as a vector composed of two angle values. For example, considering the case where the posture of the contact-type internal thermometer 200 is detected as an angle with respect to the gravitational acceleration direction, the orthogonal coordinates depending on the contact-type internal thermometer 200 are taken as the X, Y, Z directions, and the detected gravitational acceleration direction. Is the g direction and the Z direction is the normal direction of the measurement surface 20, as shown in FIG. 14, the attitude of the contact-type internal thermometer 200 is represented by angles (θ, δ) indicating the g direction. be able to. Here, θ is an angle between the vector g and the X axis when the vector g is projected onto the XY plane, and δ is an angle between the vector g and the XY plane.

Therefore, the relationship between the attitude of the contact-type internal thermometer 200 and the value of K is K (or the heat transfer rate from the first temperature sensor 32 to the outside air and the first value for the two angle values (θ, δ). 2 can be expressed as a two-dimensional table indicating the value of the heat transfer rate from the temperature sensor 33 to the outside air. An example of such a table is shown in FIG. In this table, what is represented as _{Kθ, δ} is an actual measurement value of K in the posture. The units of θ and δ are degrees. In the table shown in FIG. 15, the measurement intervals of θ and δ are 5 °, but how to do this is arbitrary. Further, the value stored in the table is not a direct value of _{Kθ, δ} , but may be a coefficient for an arbitrary K, for example, the value of K at θ = δ = 0 °. In this case, the controller 50 reads the value of such coefficient from nonvolatile memory 51, thereby determining the internal temperature T _B is multiplied by the value of K.

The specific configurations shown in the embodiments described above are shown as examples, and the invention disclosed in this specification is not limited to the configurations of these specific examples. Those skilled in the art may appropriately modify various modifications to the disclosed embodiments, for example, the shape, number, arrangement, etc. of each member or part thereof, and the technical scope of the invention disclosed in this specification is It should be understood to include such modifications.

Claims

Determining a ratio K that is not 1 between the thermal resistance of the heat dissipation surface of the first temperature sensor and the thermal resistance of the heat dissipation surface of the second temperature sensor;
Thermally contacting the endothermic surface of the first temperature sensor and the endothermic surface of the second temperature sensor with the surface to be measured of the measurement object;
Measuring a first temperature T 1 that is the temperature of the first temperature sensor and a second temperature T 2 that is the temperature of the second temperature sensor in a steady state;
A step of measuring environmental temperature T e which is a temperature around the first temperature sensor and said second temperature sensor of,
Internal temperature measurement method comprising the steps of: calculating a first temperature T 1, the second temperature T 2, the internal temperature T B of the measurement object from the environment temperature T e and the ratio K in the steady state, the .
The step of calculating the internal temperature T B, the following equation

Internal temperature measuring method according to claim 1, wherein calculating the internal temperature T B by.
A first temperature sensor having a heat absorbing surface thermally coupled to a first contact surface that contacts the surface to be measured of the measurement object, and a heat radiating surface that dissipates heat in the surroundings;
A heat-absorbing surface thermally coupled to a second contact surface that contacts the surface to be measured of the object to be measured; and a heat-dissipating surface that dissipates heat in the surroundings. A second temperature sensor different from the temperature sensor;
An environmental temperature sensor for measuring an environmental temperature that is an ambient temperature of the first temperature sensor and the second temperature sensor;
The contact-type internal thermometer which has the thermal resistance in the thermal radiation surface of a said 1st temperature sensor, and the thermal resistance ratio memory | storage part which memorize | stores the thermal resistance in the thermal radiation surface of a 2nd temperature sensor, or its ratio.
The contact-type internal temperature according to claim 3, wherein at least one of a concavo-convex structure, a heat radiating plate, a heat radiating fin, and a heat insulating material is provided on at least one heat radiating surface of the first temperature sensor and the second temperature sensor. Total.
At least one of the first temperature sensor and the second temperature sensor is mounted on an FPC (flexible printed circuit board) on the heat absorption surface, and is provided in the FPC, and is filled in an opening that exposes a part of the heat absorption surface. The contact-type internal thermometer according to claim 3 or 4, wherein the contact-type internal thermometer is thermally coupled to either the first contact surface or the second contact surface through a heat conductive adhesive.
At least one of the first temperature sensor and the second temperature sensor is mounted on an FPC arranged parallel to the surface in a plane orthogonal to the heat absorption surface, and the heat absorption surface is directly or thermally conductive adhesive. The contact-type internal thermometer according to claim 3 or 4, wherein the contact-type internal thermometer is thermally coupled to any one of the first contact surface and the second contact surface via a contact.
At least one of the first temperature sensor and the second temperature sensor is inserted into an opening provided in the FPC arranged in parallel with the heat absorption surface, and is mounted on the FPC on a surface orthogonal to the heat absorption surface. The contact-type internal thermometer according to claim 3 or 4, wherein the endothermic surface is thermally coupled to either the first contact surface or the second contact surface directly or via a heat conductive adhesive. .
The at least one of the first temperature sensor and the second temperature sensor is mounted on the FPC at the heat dissipation surface, and the FPC is provided with an opening for exposing a part of the heat dissipation surface. Contact type internal thermometer.
The first temperature sensor, the second sensor, and the environmental temperature sensor are arranged in a common shielding space that shields external light and external airflow,
The contact-type internal thermometer according to claim 3, further comprising a ventilation mechanism that forcibly ventilates the shielding space.
The ventilation mechanism includes an airflow control structure,
The contact-type internal thermometer according to claim 9, wherein the airflow control structure is configured to make the amount of airflow acting on the first temperature sensor different from the amount of airflow acting on the second temperature sensor.
And a step of detecting postures of the first temperature sensor and the second temperature sensor,
Step of calculating the internal temperature T B of the object to be measured, the internal temperature measuring method according to claim 1 or 2 for calculating the internal temperature T B based on the posture that is further detected.
The step of obtaining the ratio K includes a step of obtaining a value of the ratio K or a coefficient with respect to the value of the ratio K according to postures of the first temperature sensor and the second temperature sensor. Internal temperature measurement method.
Furthermore, it has an attitude sensor,
9. The thermal resistance ratio storage unit according to claim 3, wherein the thermal resistance ratio value according to a posture value detected by a posture sensor or a coefficient for the thermal resistance ratio value is stored. Contact type internal thermometer.