JP2010032198A - Refrigerator - Google Patents

Abstract

When a non-contact temperature detector is installed in a refrigerator storage room to detect the temperature of a detected object such as food in the room, the temperature is usually low due to the intrusion of warm air outside the chamber such as repeated opening and closing of the door. There is a problem that a temperature difference occurs at the tip of the non-contact type temperature detector, and condensation or freezing occurs to reduce the accuracy of the detected temperature.
A portion in which a thermopile infrared sensor 37 and a heating element 40 constituting a non-contact temperature detector 34 are mounted on a single wiring board 35 and the temperature of a detection target is introduced into a thermopile element 42 as a radiation infrared ray amount ( Condensation and freezing of the infrared condensing part 48 and the infrared transmitting film 45) are prevented beforehand by transferring heat generated by the heating element 40.
[Selection] Figure 3

Description

  The present invention relates to a refrigerator in which a non-contact type temperature detector that performs temperature measurement in a non-contact manner is installed in a warehouse.

  Conventionally, this type of refrigerator has been proposed in which a non-contact type temperature detector is embedded in the wall surface of the cabinet, and the temperature of the food in the cabinet is detected to improve the freshness of the food. As a specific non-contact type temperature detector, there is one in which a thermopile infrared sensor is mounted on a substrate together with an amplifier circuit or the like (for example, see Patent Document 1).

  FIG. 10 shows a perspective view of a conventional non-contact temperature detector of the refrigerator described in Patent Document 1. In FIG. FIG. 11 is a cross-sectional view of the thermopile infrared sensor of FIG. 10 taken along the line AA.

  In FIG. 10, the thermopile infrared sensor 1 is mounted on the wiring board 3, and circuit portions 2 a and 2 b that amplify the signal output from the thermopile infrared sensor 1 and perform output processing are mounted on the other wiring board 3. The Outputs subjected to signal processing by the circuit units 2 a and 2 b are connected to the connector terminals 4.

  As shown in FIG. 11, the thermopile infrared sensor 1 has a thermopile element 6 and a thermistor 7 mounted adjacent to each other on a plane portion of a header 5 made of an insulating material. The header 5 is an outer periphery, and a cylindrical metal can case 8 having an infrared transmission window on the top surface is press-fitted. The infrared transmission window of the metal can case 8 is provided with a lens 9, which introduces the temperature of the detection object into the thermopile element 6 as the amount of radiant infrared rays. A plurality of lead terminals 10 are inserted into the header 5 and are electrically connected to the thermopile element 6 and the thermistor 7.

  About the refrigerator using the non-contact-type temperature detector comprised as mentioned above, the operation | movement is demonstrated below.

  First, a non-contact type temperature detector (not shown) installed on the top of the freezer or refrigerator compartment of the refrigerator uses a thermopile element through the lens 9 with the temperature of the detection object such as food as the amount of radiant infrared rays. 6 At this time, the thermopile element 6 generates an electromotive force having a correlation with the measured temperature (infrared ray amount). Next, the electromotive force is amplified by the circuit units 2a and 2b and output to the connector terminal 4 as an output voltage.

  Further, since the thermistor 7 is disposed adjacent to the thermopile element 6, the ambient temperature of the thermopile element 6 can be measured. Similarly, the temperature detected by the thermistor 7 is output to the connector terminal 4 as an output voltage through the circuit portions 2a and 2b.

Next, the voltage from the connector terminal 4 is input on the control board (not shown) of the refrigerator. Then, the temperature correction of the thermopile element 6 based on the ambient temperature is calculated by input from the thermistor 7 to calculate the temperature of the detection target such as food and perform an operation for improving the freshness.
JP 2006-58228 A

  However, in the conventional configuration, when the refrigerator door of the storage room in which the non-contact temperature detector is arranged is opened, the warm air outside the refrigerator enters the storage room and the thermopile infrared sensor 1 is warmed. become. Since the thermopile infrared sensor 1 is always in a low temperature state, when warm air enters, the thermopile infrared sensor 1 is condensed due to the temperature difference, and particularly when the surface of the lens 9 is condensed, the detection accuracy of the temperature of the detection target is lowered. Had the problem of doing.

  In addition, when a non-contact type temperature detector is installed in the freezer compartment, if the door is opened and closed frequently, the surface of the lens 9 will freeze until the condensed water sublimates, and the temperature cannot be finally detected. Had the problem of becoming.

  The present invention solves the above-mentioned conventional problems, and eliminates false detection due to condensation and freezing caused by a temperature difference such as warm air intrusion when opening and closing a door, and ensures a temperature detection accuracy of a non-contact type temperature detector. The purpose is to provide.

  In order to solve the above conventional problems, the refrigerator of the present invention has a thermopile infrared sensor and a heat generating component constituting a non-contact type temperature detector mounted on a single wiring board.

  With this configuration, even when the temperature of the object to be detected is introduced into the thermopile element as the amount of infrared radiation, such as when a lens is condensed or frozen, the heat generated by the heat-generating component is transferred to the thermopile infrared sensor to cause condensation. And the frozen part will be heated.

  The refrigerator of the present invention can prevent a decrease in temperature detection accuracy of a non-contact type temperature detector due to condensation or freezing due to a temperature difference such as warm air intrusion when opening and closing the door, and can improve the freshness of food and the like. it can.

  According to the first aspect of the present invention, an external connection terminal, a wiring board on which a conductor circuit pattern is formed, a thermopile infrared sensor connected to the conductor circuit pattern of the wiring board, and a signal from the thermopile infrared sensor are input. A non-contact type temperature detector in which the circuit section for amplifying output and the heat generating component are mounted on the wiring board is embedded in the inner wall portion, so that the heat generated by the heat generating component is thermopile. Heating the part that is transmitted to the infrared sensor and further introduced into the thermopile element prevents condensation and freezing due to temperature differences such as the intrusion of warm air at the door opening / closing and the introduction of hot food, and the temperature detection accuracy of the non-contact temperature detector Can be secured.

  According to a second aspect of the present invention, the thermopile infrared sensor according to the first aspect of the present invention is composed of a thermopile element that detects the amount of infrared rays from a detection object, and a thermistor disposed in the vicinity of the thermopile element. Thus, since the temperature detected by the thermistor has a correlation as the ambient temperature of the thermopile infrared sensor, it can be determined whether condensation or freezing is present, and unnecessary energy application to the heat-generating component can be suppressed.

  According to the third aspect of the present invention, since the heat generating component according to the first or second aspect of the present invention is a surface mount resistor, the amount of heat generation can be adjusted by the presence or absence of voltage application, so a complicated control circuit is not required. Heat generating parts can be configured at low cost.

According to a fourth aspect of the present invention, the heat generating component according to any one of the first to third aspects is mounted on a surface opposite to the mounting surface of the thermopile infrared sensor, whereby a lead leg of the thermopile infrared sensor is provided. Since the heat generating component is disposed on the same surface as the surface to which the heat generating component is connected, the heat generated by the heat generating component can be efficiently transmitted to the thermopile infrared sensor.

  In the invention according to claim 5, since the heat capacity of the wiring board is reduced by setting the thickness of the wiring board according to any one of claims 1 to 4 to 1 mm or less, heat generation is further efficiently performed. Can communicate to thermopile infrared sensor.

  In a sixth aspect of the present invention, the period during which the heat generating component according to any one of the first to fifth aspects generates heat is set to a period other than when the thermopile element detects the amount of infrared rays from the detection target. Therefore, the temperature detection is not performed when the heat generating component generates heat and the thermopile infrared sensor is heated, so the ambient temperature of the thermopile infrared sensor is constant during temperature detection, and the accuracy error factor of the ambient temperature fluctuation due to the heat generating component can be eliminated. it can.

  According to a seventh aspect of the present invention, since the heat generating component is arranged beside the conductor circuit pattern connected to the thermopile infrared sensor according to any one of the first to sixth aspects, the most exothermic temperature is obtained. Since the lead leg of the thermopile infrared sensor is arranged at a high position, energy input to the heat-generating component can be further suppressed.

  The invention according to claim 8 is the internal temperature during defrosting by performing the period of heat generation of the heat generating component according to any one of claims 1 to 7 during the defrosting operation of the refrigerator. Since the heat generating component generates heat with a slight rise, the energy application to the heat generating component can be suppressed.

  According to a ninth aspect of the present invention, by determining the timing at which the heat generation of the heat generating component according to any one of the first to eighth aspects of the present invention is terminated based on the detected temperature of the thermistor, Since the end can be determined by the temperature, useless energy application due to heat generation for a certain period of time can be reduced.

  A tenth aspect of the present invention provides a heating means around the non-contact temperature detector according to any one of the first to ninth aspects of the present invention, and embeds the heating means in an inner wall portion. Since the ambient temperature of the non-contact temperature detector is kept constant, the ambient temperature of the thermopile infrared sensor can also be kept constant, further eliminating the effects of temperature differences such as door opening / closing warm air and hot foods Temperature detection can be performed with high accuracy.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the embodiments described above, and detailed descriptions thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a side cross-sectional view of the main part of the refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a top view of the non-contact temperature detector of the refrigerator in the first embodiment of the present invention. FIG. 3 is a side view of the non-contact temperature detector of the refrigerator in the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the thermopile infrared sensor of the refrigerator in the first embodiment of the present invention. FIG. 5 is a configuration block diagram of the non-contact temperature detector of the refrigerator in the first embodiment of the present invention.

  In FIG. 1, a freezer compartment 13, which is a part of a storage compartment of a refrigerator main body 12 constituted by a heat insulating box 11, is a refrigerator compartment having different temperature zones by an upper upper heat insulating partition plate 14 and a lower lower heat insulating partition plate 15. 16 and a vegetable compartment 17. Further, an opening (not shown) of the freezer compartment 13 is provided with a partition 18 that connects the left and right ends of the opening.

In the cold air generation chamber 19 provided on the back surface of the freezer compartment 13, an evaporator 20 that generates cold air and a blower 21 that supplies and circulates cold air to the refrigerator compartment 16, the freezer compartment 13, and the vegetable compartment 17 are arranged. A defrosting heater 22 that is energized during defrosting is disposed in the lower space of the evaporator 20. In addition, a cold air distribution chamber 23 is provided on the back surface of the freezer compartment 13, and a cold air discharge port 24 and a cold air discharge port 25 are provided continuously to the cold air distribution chamber 23.

  A door 26 and a door 27 are provided at the opening of the freezer compartment 13, and the freezer compartment 13 is closed so that there is no outflow of cold air from the freezer compartment 13. Both the door 26 and the door 27 are drawer-type doors, and when the food is taken in and out, the door 26 and the door 27 are used by being pulled out to the front side of the refrigerator, that is, the left side as shown in FIG. Further, frame bodies 28 and 29 are provided behind the door 26 and the door 27, respectively. An upper container 30 and a lower container 31 are placed on the frames 28 and 29, respectively. A cold air inlet 32 for sucking cold air and guiding it to the evaporator 10 is provided at the lower back of the freezer compartment 13.

  In addition, there is an area on the upper container 30 where the food 33 is placed by the user's hand, and a non-contact temperature detector 34 is embedded in the upper heat insulating partition plate 14 on the vertical axis.

  2 and 3, the non-contact temperature detector 34 has a thermopile infrared sensor 37 and an external connection terminal 36 mounted on one surface of a single wiring board 35. On the other surface of the wiring board 35, a circuit unit 39 for inputting a signal output from the thermopile infrared sensor 37 and outputting an amplified signal to the external connection terminal 36 is mounted and electrically connected by a conductor circuit pattern 38. ing. A heating element 40 is mounted on the other surface of the wiring board 35 and is connected to the external connection terminal 36 by a conductor circuit pattern 38.

  In FIG. 4, a thermopile infrared sensor 37 has a thermopile element 42 and a thermistor 43 mounted adjacent to each other on a flat surface portion of a header 41 made of an insulating material. The outer periphery of the header 41 is press-fitted with a metal can case 44 having an opening on the top surface. An infrared transmission film 45 is attached to the opening of the metal can case 44 and introduces the temperature of the food 33 into the thermopile element 42 as the amount of radiant infrared rays. A plurality of lead terminals 46 are inserted into the header 41, and are electrically connected to the thermopile element 42 and the thermistor 43 by wire bonding or the like. Further, the metal can case 44 is held by a cylindrical holder 47 while being in thermal contact. There is a through hole on the upper surface of the holder 47, and serves as a infrared ray condensing part 48 that defines the viewing angle of the thermopile element 42.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, after turning on the power, the operation of the refrigeration cycle (not shown) is started, and the refrigerant flows through the evaporator 20 to generate cold air. The generated cold air is sent to the cold air distribution chamber 23 by the blower 21, distributed from the cold air discharge port 24 and the cold air discharge port 25, and discharged into the freezing chamber 13. At this time, the freezer compartment 13 is cooled to a predetermined temperature by the cold air discharged into the freezer compartment 13, and the food 33 in the freezer compartment 13 is also adjusted to a temperature of −20 ° C., for example. Further, the cool air in the freezer compartment 13 passes through the cool air inlet 32 and is returned to the evaporator 20 again to be cooled.

  The non-contact temperature detector 34 inputs the signal S1 from the thermopile element 42 to the circuit unit 39 with the temperature of the object to be detected, that is, the food 33 as the amount of radiated infrared rays, and further amplifies the signal S1 by the circuit unit 39 and Input to the connection terminal 36. Similarly, the ambient temperature of the thermopile element 42 is input from the thermistor 43 to the circuit unit 39 as a signal S2, and the signal S2 is further amplified by the circuit unit 39 and input to the external connection terminal 36 as a signal S4. In the refrigerator control board 49, the signals S3 and S4 are input from the external connection terminal 36, and the temperature characteristic of the thermopile element 42 (the characteristic that the detected temperature deviates due to the ambient temperature) is corrected to improve the freshness of the food 33. Cooling operation for

  Next, when the door 26 is closed, the ambient temperature of the non-contact temperature detector 34 is fixed to the room temperature of the freezer compartment 13, for example, -20 degrees. However, when the user frequently takes in and out food, warm air outside the refrigerator flows in from the opening surface of the door 26, and along the upper heat insulating partition plate 14 on the ceiling surface of the freezer compartment 13, the non-contact temperature detector 34. The tip of is warmed. If such a change in ambient temperature continues, condensation or freezing of the infrared transmission film 45 or the infrared condensing part 48 may occur. Here, the ambient temperature is clearly increased and the number of temperature changes is determined by the refrigerator control board based on the temperature detected by the thermistor 43, and the heat generating element 40, which is a heat generating component, generates heat. The heat generated from the heat generating element 40 warms the infrared transmitting film 45 or the infrared condensing part 48 via the lead terminal 46, the metal can case 44 and the holder 47.

  As described above, in the present embodiment, the external connection terminal 36, the wiring board 35 on which the conductor circuit pattern 38 is formed, the thermopile infrared sensor 37 connected to the conductor circuit pattern 38 of the wiring board 35, and the thermopile. A circuit unit 39 that inputs and amplifies and outputs signals S1 and S2 from the infrared sensor 37, and a heating element 40, a non-contact temperature detector 34 that is mounted on a single wiring board 35, is stored in a storage room. Since the inner wall portion, that is, the upper heat insulating partition plate 14 is embedded, the thermistor 43 can determine whether or not condensation or freezing can occur at the tip of the thermopile infrared sensor 37 so that the heating element 40 can generate heat. Condensation and freezing due to temperature differences such as opening and closing of warm air and hot foods can be prevented and temperature detection accuracy of non-contact temperature detectors can be secured. .

  Further, since the thermistor 43 is disposed in the vicinity of the thermopile element 42, the temperature detected by the thermistor 43 is correlated with the ambient temperature of the thermopile infrared sensor 37, so whether or not condensation or freezing occurs at the detected temperature of the thermistor 43. Therefore, unnecessary energy application to the heating element 40 can be suppressed.

  In addition, since the heating element 40 is a surface-mounted resistor, the amount of heat generation can be adjusted depending on whether or not a voltage is applied to the conductor circuit pattern 38. Therefore, the refrigerator control board 49 is simplified, and a complicated control circuit is not required. Thus, the heating element 40 can be configured at low cost.

Further, since the heating element 40 is mounted on the wiring board 35 on the surface opposite to the mounting surface of the thermopile infrared sensor 37, the heating element 40 is mounted on the same surface as the surface to which the lead terminal 46 of the thermopile infrared sensor 37 is connected. Therefore, the heat generated by the heating element 40 can be efficiently transmitted to the tip of the thermopile infrared sensor 37. Also, since the thickness of the wiring board 35 is 1 mm or less, the heat capacity of the wiring board 35 is reduced. Therefore, the heat generated by the heating element 40 can be transmitted to the thermopile infrared sensor 37 more efficiently.

  In addition, since the period during which the heat generating element 40 generates heat is not set to the time when the thermopile element 42 detects the amount of infrared rays from the detection target, the temperature detection is performed when the heat generating element 40 generates heat and heats the thermopile infrared sensor 37. Since this is not performed, the ambient temperature of the thermopile infrared sensor 37 is constant at the time of temperature detection, and the accuracy error factor of the ambient temperature fluctuation due to the heating element 40 can be eliminated.

(Embodiment 2)
FIG. 6 is a back view of the wiring board of the non-contact temperature detector of the refrigerator in the second embodiment of the present invention.

In FIG. 6, the conductor circuit pattern 38 and the heating element 40 connected to the lead terminal 46 of the thermopile infrared sensor 37 are arranged on the same surface of the wiring board 35 at a distance d.

  As described above, since the heating element 40 is arranged beside the conductor circuit pattern 38 connected to the thermopile infrared sensor 37, the lead terminal 46 of the thermopile infrared sensor 37 is arranged at a place where the heat generation temperature is highest. Furthermore, energy input to the heating element 40 can be suppressed. Further, the heat conduction efficiency can be improved by setting the distance d to the minimum value that can secure the insulation distance and maximizing the area of the conductor circuit pattern 38 connected to the lead terminal 46 of the thermopile infrared sensor 37. it can.

(Embodiment 3)
FIG. 7 is a control flowchart of the heat generating components of the refrigerator in the third embodiment of the present invention.

  The operation will be described below with reference to FIG.

  First, in step 1, the temperature of the detection object (food 33) is detected by the thermopile element 42, and then in step 2, the ambient temperature of the thermopile element 42 is detected by the thermistor 43. Next, in step 3, it is determined whether or not defrosting is being performed on the refrigerator control board 49 (the defrosting heater 22 is energized). If defrosting is in progress, the logic proceeds to step 4; To proceed. In step 4, temperature detection of the detection target (food 33) by the thermopile element 42 is interrupted, and energization of the heating element 40 is permitted in step 5, and the logic returns to step 3. In step 6, energization of the heating element 40 is prohibited, the temperature detection of the detection object (food 33) is continued by the thermopile element 42, and the logic is returned to step 1.

  As described above, in the present embodiment, the heating element 40 is heated during the defrosting operation of the refrigerator, so that the heating element is in a state where the temperature in the freezing chamber 13 during the defrosting is slightly increased. Since 40 is heated, energy application can be suppressed by suppressing application of energy to the heating element 40.

(Embodiment 4)
FIG. 8 is a control flowchart of the heat-generating component of the refrigerator in the fourth embodiment of the present invention.

  The operation will be described below with reference to FIG.

  First, it is determined in step 7 whether or not the heating element 40 is energized. If it is energized, the logic advances to step 8; otherwise, the logic of step 7 is repeated. Next, in step 8, the thermistor 43 detects the ambient temperature of the thermopile element 42 and determines whether or not the temperature is equal to or higher than a specified temperature T1, and if it is equal to or higher than the temperature T1, the logic proceeds to step 9; Proceed to 10. In step 9, it is determined that the thermopile infrared sensor 37 has been sufficiently warmed up, energization of the heat generating element 40, which is a heat generating component, is terminated, and the logic is returned to step 7. In step 10, it is determined that the thermopile infrared sensor 37 has not been sufficiently warmed up, and energization of the heating element 40 is continued, and the logic is returned to step 8.

  As described above, in the present embodiment, the end of the heat generation of the heat generating element 40 is determined based on the detection temperature of the thermistor 43, so that the end can be determined based on the ambient temperature of the thermopile infrared sensor 37. It is possible to reduce unnecessary energy application due to the excessive energization as seen, and to further save energy.

(Embodiment 5)
FIG. 9 is a side sectional view of an essential part of the refrigerator in the fifth embodiment of the present invention.

  In FIG. 9, the non-contact temperature detector 34 is a surface embedded in the upper heat insulating partition plate 14, and the heating means 50 is arranged at an interval at which heat can be conducted to the non-contact temperature detector 34. The heating means 50 is generally a linear / planar shape and the input voltage is an AC / DC heater, but is not limited as long as it can be embedded in the upper heat insulating partition plate 14. Further, it is desirable that the temperature rise value by the heating means 50 is set so as not to affect the temperature of the upper refrigerator compartment 16.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As described in the first embodiment, the ambient temperature of the non-contact temperature detector 34 is detected by the thermistor 43 and input to the refrigerator control board 49. Next, in the refrigerator control board 49, even when there is a temperature inflow such as warm air intrusion when opening / closing the door or hot food addition, a predetermined temperature (denoted as T 2) that does not cause condensation or freezing, and the ambient temperature from the thermistor 43. The temperatures (T3) are compared, and the heating means 50 is controlled so that T2 = T3.

  As described above, in this embodiment, the ambient temperature of the non-contact temperature detector 34 is kept constant by providing the heating means 50 around the non-contact temperature detector 34 and burying it in the upper heat insulating partition plate 14. Therefore, freezing and condensation around the non-contact temperature detector 34 can be prevented, and the temperature of the detection target can be detected with high accuracy and high reliability.

  Also, when the non-contact temperature detector 34 is mechanically operated such as rotating or moving in order to detect a wide range of temperatures, freezing of the movable part can be prevented and highly reliable temperature detection can be performed.

  The refrigerator according to the present invention is not only implemented when the non-contact temperature detector is applied to a household or commercial refrigerator, but the ambient temperature of the non-contact temperature detector greatly varies in an article storage device with a door. It can be applied to a wide range of equipment with the possibility of condensation and freezing.

Side surface sectional drawing of the principal part of the refrigerator in Embodiment 1 of this invention The top view of the non-contact temperature detector of the refrigerator in Embodiment 1 of this invention Side view of the non-contact temperature detector of the refrigerator according to Embodiment 1 of the present invention. Sectional drawing of the thermopile infrared sensor of the refrigerator in Embodiment 1 of this invention Configuration block diagram of a non-contact temperature detector of the refrigerator in Embodiment 1 of the present invention The wiring board back view of the non-contact temperature detector of the refrigerator in Embodiment 2 of the present invention Control flow chart of the heat generating component of the refrigerator in Embodiment 3 of the present invention Control flow chart of heat generating components of refrigerator in embodiment 4 of the present invention Side surface sectional drawing of the principal part of the refrigerator in Embodiment 5 of this invention A perspective view of a conventional non-contact temperature detector of a refrigerator AA sectional view of the thermopile infrared sensor of FIG. 10 of a conventional refrigerator

DESCRIPTION OF SYMBOLS 11 Heat insulation box 12 Refrigerator main body 13 Freezing room 14 Upper heat insulation partition plate 15 Lower heat insulation partition plate 16 Refrigeration room 17 Vegetable room 18 Partition 19 Cold air generation room 20 Evaporator 21 Blower 22 Defrost heater 23 Cold air distribution room 24 Cold air discharge Outlet 25 Cold air outlet 26 Door 27 Door 28 Frame 29 Frame 30 Upper container 31 Lower container 32 Cold air inlet 33 Food 34 Non-contact temperature detector 35 Wiring board 36 External connection terminal 37 Thermopile infrared sensor 38 Conductor circuit pattern 39 Circuit 40 Heating element 41 Header 42 Thermopile element 43 Thermistor 44 Metal can case 45 Infrared transmitting film 46 Lead terminal 47 Holder 48 Infrared condensing part 49 Refrigerator control board 50 Heating means

Claims (10)

Refrigerator body composed of a heat insulation box, storage chamber provided in the refrigerator body, external connection terminals, wiring board on which a conductor circuit pattern is formed, and thermopile connected to the conductor circuit pattern of the wiring board A non-contact type temperature detector in which an infrared sensor, a circuit portion for inputting and amplifying and outputting a signal from the thermopile infrared sensor, and a heat generating component are mounted on the wiring board, and a storage wall of the storage chamber A refrigerator characterized by being embedded in a section. The refrigerator according to claim 1, wherein the thermopile infrared sensor includes a thermopile element that detects an infrared ray amount from a detection target and a thermistor disposed in the vicinity of the thermopile element. The refrigerator according to claim 1 or 2, wherein the heat generating component is a surface mount resistor. The refrigerator according to any one of claims 1 to 3, wherein the heat generating component is mounted on a surface opposite to a mounting surface of the thermopile infrared sensor. The refrigerator according to any one of claims 1 to 4, wherein a thickness of the wiring board is 1 mm or less. The refrigerator according to any one of claims 1 to 5, wherein a period during which the heat generating component generates heat is set to a time other than when the thermopile element detects an infrared ray amount from a detection target. The refrigerator according to any one of claims 1 to 6, wherein the heat generating component is disposed beside a conductor circuit pattern connected to the thermopile infrared sensor. The refrigerator according to any one of claims 1 to 7, wherein a period during which the heat generating component generates heat is performed during a defrosting operation of the refrigerator. The refrigerator according to any one of claims 1 to 8, wherein the timing for ending the heat generation of the heat generating component is determined based on a temperature detected by the thermistor. The refrigerator according to any one of claims 1 to 9, wherein a heating unit is provided around the non-contact temperature detector, and the heating unit is embedded in an inner wall portion.