JP2017059459A - Constant-temperature heating device, toy, game machine, and tableware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant-temperature heating device which is safe, is low in power consumption, is capable of being easily and inexpensively fabricated, and has a fast response speed.SOLUTION: A constant-temperature heating device has a specified preset temperature, and includes a power source Vcc, heating elements PTC 1-3, a switching element Q1, a comparator element Cmp1, an NTC thermistor element NTC1, and a plurality of resistive elements R1-R5. In the constant-temperature heating device, a voltage-dividing circuit for temperature detection includes the resistive element R1 and the NTC thermistor element NTC1, a voltage-dividing circuit for comparison includes the resistive element R2 and the resistive element R3, the comparator element Cmp1 compares whether voltage for temperature detection is greater or less than voltage for comparison, and the switching element Q1 is turned-on and turned-off according to whether the temperature of the NTC thermistor element NTC1 is lower or higher than the preset temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a constant temperature heating device, and more particularly to a constant temperature heating device that is safe, consumes little power, can be easily and inexpensively manufactured, and has a high response speed.

  The present invention also relates to a toy, a game machine, and tableware using the constant temperature heating device of the present invention.

  In the fields of toys, gaming machines, tableware, etc., there is a demand for a constant temperature heating device that generates heat at a constant temperature of normal temperature or higher and lower than 100 ° C.

  For example, in a toy in which a doll having hair whose color changes with temperature and a hair dryer are combined, a constant temperature heating device may be used as a heat source for the hair dryer.

  Alternatively, when a prize is awarded (when winning is awarded) or when a prize is confirmed (when it is confirmed that a prize is won afterwards) in a pachinko device or pachinko throttle device that is a gaming machine, the prize is generated. Alternatively, it is conceivable to use a constant temperature heating device in order to notify the player of the winning decision.

  Alternatively, it is conceivable to use a constant temperature heating device in order to incorporate into a tableware such as a spoon for sipping food and to melt the ice cream easily.

  Various circuits and heat sources have been used as constant temperature heating devices.

  In a constant temperature heating device used for toys, gaming machines, tableware, etc., safety is a top priority. In addition, it requires low power consumption, a circuit that can be easily manufactured at low cost, and a fast response speed (rise to a preset temperature in a short time after switching on). .

  An object of the present invention is to provide a constant temperature heating device that is safe, has low power consumption, can be easily and inexpensively manufactured, and has a high response speed.

  As its means, the constant temperature heating device of the present invention is a device that generates heat at a predetermined set temperature or a temperature near the set temperature, and includes a power source, a heating element, a switching element, a comparator element, and an NTC thermistor element. And a plurality of resistance elements, the heating element generates heat from the power source, the switching element is inserted between the power source and the heating element, the comparator element controls on and off of the switching element, and NTC The thermistor element is disposed in the vicinity of the heat generating element and is thermally coupled to the heat generating element so as to approach the same temperature as the heat generating element. The thermistor element includes a resistance value at a set temperature as a threshold resistance value and includes at least one NTC thermistor element. A resistance element is connected in series, and a constant voltage is applied to form a temperature detection voltage dividing circuit, and the NTC of the temperature detection voltage dividing circuit is formed. -A temperature detection voltage is output from the connection point between the mister element and the resistance element, at least two resistance elements are connected in series, and a constant voltage is applied to form a voltage dividing circuit for comparison. A comparison voltage is output from a connection point between one resistance element and another resistance element of the voltage dividing circuit, and the resistance values of the resistance elements of the temperature detecting voltage dividing circuit and the resistance dividing circuit are respectively The voltages applied to the temperature detection voltage dividing circuit and the comparison voltage dividing circuit are for temperature detection when the temperature of the NTC thermistor element is the set temperature and the resistance value of the NTC thermistor element is the threshold resistance value. Voltage = comparison voltage, when the temperature of the NTC thermistor element is lower than the set temperature and the resistance value of the NTC thermistor element is larger than the threshold resistance value, the temperature detection voltage> ratio When the temperature of the NTC thermistor element is higher than the set temperature and the resistance value of the NTC thermistor element is smaller than the threshold resistance value, the temperature detection voltage <the comparison voltage or the NTC thermistor element When the temperature of the NTC thermistor element is lower than the set temperature and the resistance value of the NTC thermistor element is larger than the threshold resistance value, the temperature detection voltage <the comparison voltage, and the temperature of the NTC thermistor element is higher than the set temperature. When the resistance value of the element is smaller than the threshold resistance value, the temperature detection voltage> the comparison voltage. The comparator element compares the temperature detection voltage with the comparison voltage, and the temperature of the NTC thermistor element is the set temperature. When the resistance value of the NTC thermistor element is lower than the threshold resistance value, the switching element is turned on and the NTC thermistor element When the temperature is higher than the set temperature and the resistance value of the NTC thermistor element is smaller than the threshold resistance value, the switching element is turned off.

  Furthermore, it is preferable that a heat insulating plate made of metal is provided, and that the NTC thermistor element and the heat generating element are mounted on the heat insulating plate via an insulating member. In this case, the degree of thermal coupling between the NTC thermistor element and the heating element is increased, heat can be generated at a set temperature or a temperature near the set temperature with higher accuracy, and the response speed is also improved.

  For example, a PTC thermistor element can be used as the heating element. In this case, even if the temperature rises abnormally than the set temperature due to a malfunction, the resistance value of the PTC thermistor element rises and further temperature rise can be suppressed, so that safety is further improved. .

  The comparison voltage can be made variable, the threshold resistance value of the NTC thermistor element can be changed, and the set temperature can be changed. In this case, it is possible to set a plurality of set temperatures with one constant temperature heating device. In this case, a series circuit of resistance elements and switches connected in series is replaced with at least one resistance element of the voltage dividing circuit for comparison, and a switch is switched for replacement. The voltage can be made variable. Alternatively, the comparison resistor can be made variable by replacing the variable resistor with at least one resistive element of the comparison voltage dividing circuit and adjusting the variable resistor.

  The constant temperature heating device of the present invention can be used for, for example, toys, gaming machines, tableware, and the like, which require high safety.

  The constant temperature heating device according to the present invention has high safety and low power consumption because the supply of power to the heating element is stopped when the set temperature is exceeded. In addition, the constant temperature heating device of the present invention is configured by an analog circuit and does not require an expensive analog-digital converter (ADC) and can be manufactured at low cost. Further, the constant temperature heating device of the present invention has a high response speed.

1 is an equivalent circuit diagram showing a constant temperature heating device 100 according to a first embodiment. 3 is a partial plan view of the constant temperature heating device 100. FIG. 3 is a graph showing a temperature change of the constant temperature heating device 100. It is an equivalent circuit diagram which shows the constant temperature heat generating apparatus 200 concerning 2nd Embodiment. It is an equivalent circuit diagram which shows the constant temperature heating apparatus 300 concerning 3rd Embodiment. It is an equivalent circuit diagram which shows the constant temperature heat generating apparatus 400 concerning 4th Embodiment. It is an equivalent circuit diagram which shows the constant temperature heat generating apparatus 500 concerning 5th Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  Each embodiment shows an embodiment of the present invention exemplarily, and the present invention is not limited to the content of the embodiment. Moreover, it is also possible to implement combining the content described in different embodiment, and the implementation content in that case is also included in this invention. Further, the drawings are for helping understanding of the embodiment, and may not be drawn strictly. For example, a drawn component or a dimensional ratio between the components may not match the dimensional ratio described in the specification. In addition, the constituent elements described in the specification may be omitted in the drawings or may be drawn with the number omitted.

[First Embodiment]
1 and 2 show a constant temperature heating device 100 according to the first embodiment. However, FIG. 1 is an equivalent circuit diagram of the constant temperature heating device 100. FIG. 2 is a partial plan view showing the NTC thermistor element and the heater section of the constant temperature heating device 100.

  The constant temperature heating device 100 generates heat at a preset temperature or a temperature near the preset temperature. In the present embodiment, the set temperature is set to 40 ° C. When the constant temperature heating device 100 is turned on, power is supplied to a heater unit described later, and the heater unit starts to generate heat. And if a heater part continues heat_generation | fever and the temperature of a heater part rises and exceeds 40 degreeC, supply of the electric power to a heater part will be stopped, and a heater part will stop heat_generation | fever. And when time passes and the temperature of a heater part falls and falls below 40 degreeC, supply of the electric power to a heater part will be restarted and a heater part will resume heat_generation | fever. As a result, the heater part of the constant temperature heating device 100 is maintained at a temperature of 40 ° C. or around 40 ° C.

  As shown in FIG. 1, the constant temperature heating device 100 includes a power source Vcc. In the present embodiment, the power supply Vcc is 6V DC. A switch SW1 is connected to the power source Vcc as a power switch.

  The constant temperature heating device 100 includes three PTC thermistor elements PTC1, PTC2, and PTC3 as heating elements. The PTC thermistor elements PTC1, PTC2, and PTC3 are connected to each other in parallel to form the heater unit 3. The heater unit 3 generates heat by the power of the power source Vcc.

  A switching element Q1 is inserted between the switch SW1 and the heater unit 3. The switching element Q1 turns on / off power transmission from the power source Vcc to the heater unit 3. In the present embodiment, a PNP transistor is used as the switching element Q1.

  The constant temperature heating device 100 includes a temperature detection voltage dividing circuit in which a resistance element R1 and an NTC thermistor element NTC1 are connected in series. In the voltage detection circuit for temperature detection, the end on the resistance element R1 side is connected to the load side (the side opposite to the power supply Vcc) of the switch SW1, and the end on the NTC thermistor element NTC1 side is connected to the ground. The temperature detection voltage dividing circuit outputs a temperature detection voltage from a connection point between the resistance element R1 and the NTC thermistor element NTC1.

  The constant temperature heating device 100 includes a comparison voltage dividing circuit in which a resistance element R2 and a resistance element R3 are connected in series. In the voltage dividing circuit for comparison, the end on the resistance element R2 side is connected to the load side of the switch SW1, and the end on the resistance element R3 side is connected to the ground. The comparison voltage dividing circuit outputs a comparison voltage from the connection point between the resistance element R2 and the resistance element R3.

  The constant temperature heating device 100 includes a comparator element Cmp1.

  A connection point between the resistance element R1 of the temperature detection voltage dividing circuit and the NTC thermistor element NTC1 is connected to the inverting input terminal − of the comparator element Cmp1.

  A connection point between the resistance element R2 and the resistance element R3 of the voltage dividing circuit for comparison is connected to the non-inverting input terminal + of the comparator element Cmp1.

  The positive power supply terminal of the comparator element Cmp1 is connected to the load side of the switch SW1.

  The negative power supply terminal of the comparator element Cmp1 is connected to the ground.

  The output terminal of the comparator element Cmp1 is connected to the control terminal of the switching element Q1 via the resistance element R4.

  A connection point between the resistance element R4 and the switching element Q1 is separately connected to the load side of the switch SW1 via the resistance element R5.

  Table 1 shows the resistance value of each element.

ＮＴＣサーミスタ素子ＮＴＣ１は、ヒーター部３（ＰＴＣサーミスタ素子ＰＴＣ１〜３）の近傍に配置され、ヒーター部３と同じ温度に近づくように、ヒーター部３と熱的に結合されている。図１において、ＮＴＣサーミスタ素子ＮＴＣ１とヒーター部３とが熱的に結合している領域を、破線で囲んで示す。

The NTC thermistor element NTC1 is disposed in the vicinity of the heater unit 3 (PTC thermistor elements PTC1 to 3) and is thermally coupled to the heater unit 3 so as to approach the same temperature as the heater unit 3. In FIG. 1, a region where the NTC thermistor element NTC <b> 1 and the heater unit 3 are thermally coupled is surrounded by a broken line.

  Moreover, the specific example of NTC thermistor element NTC1 and the heater part 3 (PTC thermistor elements PTC1-3) is shown in FIG.

  As shown in FIG. 2, a heat insulating plate 1 made of aluminum or the like is prepared, and an insulating thin circuit board 2 made of resin or the like is attached to the main surface of the heat insulating plate 1. Three lines of circuit wiring 4a, 4b, 4c are formed on the circuit board 2. One terminal of each of the PTC thermistor elements PTC1 to PTC3 is connected to the circuit wiring 4a. Further, one terminal of the NTC thermistor element NTC1 is connected to the circuit wiring 4b. The circuit wiring 4c is connected to the other terminals of the PTC thermistor elements PTC1 to PTC1 and the other terminal of the NTC thermistor element NTC1.

  Furthermore, lead wires 5a, 5b, and 5c are connected to the circuit wirings 4a, 4b, and 4c, respectively. The lead wire 5a is connected to the switching element Q1 shown in FIG. The lead wire 5b is connected to the resistance element R1 shown in FIG. The lead wire 5c is connected to the ground shown in FIG.

  As described above, the set temperature of the constant temperature heating device 100 is set to 40 ° C. The NTC thermistor element NTC1 has a negative resistance temperature coefficient, and has a resistance value at 40 ° C., which is a set temperature of the constant temperature heating device 100, as a threshold resistance value. In the present embodiment, as shown in Table 1, since an element having a resistance value of 5.6 kΩ at 40 ° C. is used for the NTC thermistor element NTC1, the threshold resistance value of the NTC thermistor element NTC1 is 5.6 kΩ.

  The NTC thermistor element NTC1 exhibits a resistance value of 5.6 kΩ, which is a threshold resistance value, when its own temperature is 40 ° C. (the temperature of the heater section 3 is approximately 40 ° C.). The NTC thermistor element NTC1 exhibits a resistance value higher than the threshold resistance value of 5.6 kΩ when the temperature of the NTC thermistor element NTC1 falls below 40 ° C. (the temperature of the heater unit 3 is approximately 40 ° C.). The NTC thermistor element NTC1 exhibits a resistance value lower than the threshold resistance value of 5.6 kΩ when the temperature of the NTC thermistor element NTC1 exceeds 40 ° C. (the temperature of the heater unit 3 is approximately 40 ° C.).

  The resistance values of the resistance element R1 of the temperature detection voltage dividing circuit, the resistance elements R2 and R3 of the comparison voltage dividing circuit, and the voltages applied to the temperature detection voltage dividing circuit and the comparison voltage dividing circuit, respectively, are: When the temperature of the NTC thermistor element NTC1 is the set temperature of 40 ° C. and the resistance value of the NTC thermistor element NTC1 is 5.6Ω which is the threshold resistance value, the temperature detection voltage and the comparison voltage are equal (temperature detection voltage) = Voltage for comparison).

  Specifically, as shown in Table 1, the resistance element R1 is set to 4.7 kΩ, the resistance element R2 is set to 4.7 kΩ, and the resistance element R3 is set to 5.6 kΩ.

  Further, as described above, one end of each of the temperature detection voltage dividing circuit and the comparison voltage dividing circuit is connected to the load side of the switch SW1, so that when the power switch SW1 is turned on, the temperature is A DC voltage of 6 V from the power source Vcc is applied to the detection voltage dividing circuit and the comparison voltage dividing circuit, respectively.

  As a result, the comparison voltage is always about 3.26V.

  Further, the temperature detection voltage is 5.6Ω, in which the temperature of the NTC thermistor element NTC1 is 40 ° C. (the temperature of the heater section 3 is approximately 40 ° C.) and the resistance value of the NTC thermistor element NTC1 is a threshold resistance value. Sometimes it is about 3.26V.

  Table 1 shows a calculation formula for the comparison voltage and a calculation formula for the temperature detection voltage when the temperature of the NTC thermistor element NTC1 is 40 ° C.

  The temperature detection voltage is about 3.26 V when the temperature of the NTC thermistor element NTC1 is 40 ° C. However, when the temperature of the NTC thermistor element NTC1 becomes lower than 40 ° C., the resistance value of the NTC thermistor element NTC1 is 5. Since it becomes larger than 6 kΩ, the temperature detection voltage becomes larger than 3.26V.

  On the contrary, when the temperature of the NTC thermistor element NTC1 exceeds 40 ° C., the resistance value of the NTC thermistor element NTC1 becomes smaller than 5.6 kΩ, so that the temperature detection voltage becomes smaller than 3.26V.

  In the constant temperature heating device 100, the comparison voltage and the temperature detection voltage are compared by the comparator element Cmp1, the temperature of the NTC thermistor element NTC1 (temperature of the heater unit 3) is detected, and the switching element Q1 is turned on. Control off and on.

  Specifically, when the resistance value of the NTC thermistor element NTC1 is larger than the threshold resistance value 5.6 kΩ and the temperature detection voltage is larger than the comparison voltage (temperature detection voltage> comparison voltage), the NTC thermistor element It is determined that the temperature of NTC1 (the temperature of the heater unit 3) is lower than the set temperature of 40 ° C., the negative maximum voltage is output from the output terminal of the comparator element Cmp1 to turn on the switching element Q1, Power is supplied to the unit 3.

  Conversely, when the resistance value of the NTC thermistor element NTC is smaller than the threshold resistance value 5.6 kΩ and the temperature detection voltage is smaller than the comparison voltage (temperature detection voltage <comparison voltage), the NTC thermistor element NTC1 It is determined that the temperature (temperature of the heater unit 3) is higher than the set temperature of 40 ° C., the positive maximum voltage is output from the output terminal of the comparator element Cmp1, the switching element Q1 is turned off, and the heater unit 3 from the power source Vcc Stop supplying power to

  The operation of the constant temperature heating device 100 having the above configuration will be described again and organized.

  When the power switch SW1 is turned on, the temperature detection voltage dividing circuit including the resistance element R1 and the NTC thermistor element NTC1 from the power supply Vcc, and the resistance element R2 and the resistance element R3 are included. Electric power is supplied to the voltage dividing circuit for comparison. At this time, since the temperature of the NTC thermistor element NTC is lower than the set temperature of 40 ° C., the resistance value of the NTC thermistor element NTC is larger than the threshold resistance value 5.6 kΩ, and the temperature detection voltage is higher than the comparison voltage. Since the negative maximum voltage is output from the output terminal of the comparator element Cmp1, the switching element Q1 is turned on. As a result, electric power is also supplied from the power source Vcc to the heater unit 3 (PTC thermistor elements PTC1 to PTC1) via the switching element Q1.

  The heater unit 3 (PTC thermistor elements PTC1 to PTC1 to PTC3) receiving the supply of power starts to generate heat.

  When the power supply continues and the temperature of the heater section 3 (PTC thermistor elements PTC1 to 3) exceeds the set temperature of 40 ° C. and the temperature of the NTC thermistor element NTC1 exceeds the set temperature of 40 ° C., the NTC thermistor The resistance value of the element NTC1 becomes smaller than the threshold resistance value 5.6 kΩ, the temperature detection voltage becomes smaller than the comparison voltage, the maximum positive voltage is output from the output terminal of the comparator element Cmp1, and the switching element Q1 is turned off. To. As a result, the supply of power to the heater unit 3 (PTC thermistor elements PTC1 to PTC1) is stopped, and the heater unit 3 stops generating heat.

  Then, the temperature of the heater unit 3 is lowered, the temperature of the NTC thermistor element NTC1 is further lowered to be lower than the set temperature of 40 ° C., and the resistance value of the NTC thermistor element NTC1 becomes larger than the threshold resistance value 5.6 kΩ, thereby detecting the temperature. When the working voltage becomes larger than the comparison voltage, the negative maximum voltage is output again from the output terminal of the comparator element Cmp1, and the switching element Q1 is turned on. As a result, the supply of power to the heater unit 3 is resumed, and the heater unit 3 resumes heat generation.

  As described above, the constant temperature heating device 100 repeats the stop and restart of the heat generation by the heater unit 3 (PTC thermistor elements PTC1 to PTC1), thereby providing a stable heat supply at a temperature around 40 ° C. which is a set temperature. Do it.

  FIG. 3 is a graph showing the temperature change of the heat insulating plate 1 made of aluminum or the like after the power switch SW1 is turned on. In FIG. 3, a part of the time is shown in an enlarged manner. The temperature of the heat insulating plate 1 was measured with a thermocouple.

  As can be seen from FIG. 3, the heat retaining plate 1 of the constant temperature heating device 100 reaches the set temperature of 40 ° C. in about 1.3 seconds after the SW1 is turned on, and the response speed is very fast.

  In addition, the heat retaining plate 1 of the constant temperature heating device 100 is maintained at a temperature in the vicinity of 40 ° C., which is a set temperature, and supplies heat stably.

  As described above, the constant-temperature heating device 100 has high safety and low power consumption because supply of power to the heating elements (PTC thermistor elements PTC1 to PTC1 to PTC1-3) is stopped when the set temperature is exceeded. In addition, the constant temperature heating device 100 is configured by an analog circuit and does not require an expensive analog-digital converter (ADC) and can be manufactured at low cost. The constant temperature heating device 100 has a very fast response speed. Furthermore, since the constant temperature heating device 100 uses the PTC thermistor elements PTC1 to PTC3 as the heating elements, even if the temperature rises abnormally from the set temperature due to a malfunction, the resistance value of the PTC thermistor elements PTC1 to PTC3. Since the temperature rises and the temperature rise beyond that can be suppressed, safety is higher.

[Second Embodiment]
FIG. 4 shows a constant temperature heating device 200 according to the second embodiment. However, FIG. 2 is an equivalent circuit diagram of the constant temperature heating device 200.

  The constant temperature heating device 200 is modified from the constant temperature heating device 100 according to the first embodiment shown in FIGS. 1 and 2 to a temperature detection voltage dividing circuit, a comparison voltage dividing circuit, and the like.

  Specifically, the constant temperature heat generating apparatus 200 configures a temperature detection voltage dividing circuit by connecting an NTC thermistor element NTC1 and a resistance element R11 in series, and an end on the NTC thermistor element NTC1 side is connected to the load side of the switch SW1. (The side opposite to the power supply Vcc) was connected, and the end of the resistor element R11 was connected to ground. Unlike the constant temperature heating device 100, the connection point between the NTC thermistor element NTC1 and the resistance element R11 of the temperature detection voltage dividing circuit was connected to the non-inverting input terminal + of the comparator element Cmp1.

  In addition, the constant temperature heating device 200 forms a comparison voltage dividing circuit by connecting the resistance element R12 and the resistance element R13 in series, and connects the end of the resistance element R12 to the load side of the switch SW1. The end on the R13 side was connected to the ground. Unlike the constant temperature heating device 100, the connection point between the resistive element R12 and the resistive element R13 of the comparative voltage dividing circuit was connected to the inverting input terminal − of the comparator element Cmp1.

  Table 2 shows the resistance value of each element of the constant temperature heating device 200.

定温発熱装置２００も、定温発熱装置１００と同様に、設定温度が４０℃に設定されている。

Similarly to the constant temperature heating device 100, the constant temperature heating device 200 is set to a set temperature of 40 ° C.

  Similarly to the constant temperature heating device 100, the NTC thermistor element NTC1 uses an element having a resistance value of 5.6 kΩ at 40 ° C., and the threshold resistance value of the NTC thermistor element NTC1 is 5.6 kΩ.

  The NTC thermistor element NTC1 exhibits a resistance value of 5.6 kΩ, which is a threshold resistance value, when its temperature is 40 ° C. Further, when its own temperature falls below 40 ° C., it shows a resistance value higher than the threshold resistance value of 5.6 kΩ. Further, when its own temperature exceeds 40 ° C., it shows a resistance value lower than the threshold resistance value of 5.6 kΩ.

  As shown in Table 2, in the constant temperature heating device 200, the resistance element R11 is set to 4.7 kΩ, the resistance element R12 is set to 5.6 kΩ, and the resistance element R13 is set to 4.7 kΩ.

  In the constant temperature heating device 200, the comparative voltage is always about 2.74V.

  The temperature detection voltage is about 2.74 V when the temperature of the NTC thermistor element NTC1 is 40 ° C. which is the set temperature and the resistance value of the NTC thermistor element NTC1 is 5.6Ω which is the threshold resistance value.

  Table 2 shows a calculation formula for the comparison voltage and a calculation formula for the temperature detection voltage when the temperature of the NTC thermistor element NTC1 is 40 ° C.

  The temperature detection voltage is about 2.74 V when the temperature of the NTC thermistor element NTC1 is 40 ° C. When the temperature of the NTC thermistor element NTC1 becomes lower than 40 ° C., the resistance value of the NTC thermistor element NTC1 is 5. Since it becomes larger than 6 kΩ, the temperature detection voltage becomes smaller than 2.74V. This behavior is opposite to the behavior of the constant temperature heating device 100 of the first embodiment because the configuration and wiring of the temperature detection voltage dividing circuit are different.

  On the contrary, when the temperature of the NTC thermistor element NTC1 exceeds 40 ° C., the resistance value of the NTC thermistor element NTC1 becomes smaller than 5.6 kΩ, so that the temperature detection voltage becomes larger than 2.74V. This behavior is also opposite to the behavior of the constant temperature heating device 100 of the first embodiment because the configuration and wiring of the temperature detection voltage dividing circuit are different.

  Also in the constant temperature heating apparatus 200, the comparison voltage and the temperature detection voltage are compared by the comparator element Cmp1, the temperature of the NTC thermistor element NTC1 is detected, and the switching element Q1 is turned on and off.

  Specifically, when the resistance value of the NTC thermistor element NTC is larger than the threshold resistance value 5.6 kΩ and the temperature detection voltage is smaller than the comparison voltage (temperature detection voltage <comparison voltage), the NTC thermistor element It is determined that the temperature of NTC1 is lower than the set temperature of 40 ° C., the negative maximum voltage is output from the output terminal of the comparator element Cmp1, the switching element Q1 is turned on, and power is supplied from the power supply Vcc to the heater unit 3 .

  On the contrary, when the resistance value of the NTC thermistor element NTC is smaller than the threshold resistance value 5.6 kΩ and the temperature detection voltage is larger than the comparison voltage (temperature detection voltage> comparison voltage), the NTC thermistor element NTC1 It is determined that the temperature is higher than the set temperature of 40 ° C., the positive maximum voltage is output from the output terminal of the comparator element Cmp1, the switching element Q1 is turned off, and the supply of power from the power source Vcc to the heater unit 3 is stopped. To do.

  The constant temperature heating device 200 includes a temperature detection voltage dividing circuit, a comparison voltage dividing circuit configuration, and wiring, which are different from the constant temperature heating device 100. However, like the constant temperature heating device 100, the constant temperature heating device 200 has a set temperature around 40 ° C. Stable heat supply can be performed at temperature.

[Third Embodiment]
FIG. 5 shows a constant temperature heating device 300 according to the third embodiment. However, FIG. 5 is an equivalent circuit diagram of the constant temperature heating device 300.

  The constant temperature heating device 300 includes a resistance element R3 of the constant temperature heating device 100 according to the first embodiment shown in FIGS. 1 and 2, a series circuit in which a resistance element R31 and a switch SW2 are connected in series, and a resistance element. A series circuit in which R32 and the switch SW3 are connected in series is replaced with a circuit connected in parallel. In FIG. 5, for the sake of convenience, the resistor element R31 and the resistor element R32 are collectively indicated by the symbol R3.

  Table 3 shows the resistance value of each element of the constant temperature heating device 300.

表３に示すとおり、定温発熱装置３００は、抵抗素子Ｒ３１を５．６ｋΩに、抵抗素子Ｒ３２を６．８ｋΩに、それぞれ設定している。なお、符号Ｒ３で示す抵抗素子Ｒ３１と、抵抗素子Ｒ３２の合成抵抗値は、スイッチＳＷ２がオンで、スイッチＳＷ３がオフのときに５．６ｋΩ、スイッチＳＷ２とスイッチＳＷ３の両方がオンのときに３．１ｋΩになる。

As shown in Table 3, the constant temperature heating device 300 sets the resistance element R31 to 5.6 kΩ and the resistance element R32 to 6.8 kΩ, respectively. Note that the combined resistance value of the resistor element R31 and the resistor element R32 indicated by reference numeral R3 is 5.6 kΩ when the switch SW2 is on and the switch SW3 is off, and is 3 when both the switch SW2 and the switch SW3 are on. .1 kΩ.

  As a result, the constant temperature heating device 300 can set the comparison voltage to about 3.26 V by turning on the switch SW2 and turning off the switch SW3. Further, by turning on both the switch SW2 and the switch SW3, the comparison voltage can be set to about 2.38V. Table 3 shows the respective calculation formulas.

  On the other hand, the NTC thermistor element NTC1 of the constant temperature heating device 300 is the same type as the NTC element NTC1 of the constant temperature heating device 100, but has a negative resistance temperature coefficient and has a resistance value of 5.6 kΩ at 40 ° C. The resistance value is 3.1 kΩ at 60 ° C.

  As a result, in the constant temperature heating device 300, the temperature detection voltage becomes about 3.26V when the temperature of the NTC thermistor element NTC1 is 40 ° C., and about 2.38V when the temperature of the NTC thermistor element NTC1 is 60 ° C. become. Table 3 shows the respective calculation formulas.

  As described above, the constant temperature heating device 300 can change the set temperature by switching the switch SW2 and the switch SW3. Specifically, the set temperature can be set to 40 ° C. by turning on the switch SW2 and turning off the switch SW3. In addition, the set temperature can be set to 60 ° C. by turning on both the switch SW2 and the switch SW3.

  In the present invention, like the constant temperature heating device 300, the set temperature can be made variable.

[Fourth Embodiment]
FIG. 6 shows a constant temperature heating device 400 according to the fourth embodiment. However, FIG. 6 is an equivalent circuit diagram of the constant temperature heating device 400.

  In the constant temperature heating device 400, the resistance element R3 of the constant temperature heating device 100 according to the first embodiment shown in FIGS. 1 and 2 is replaced with a variable resistor R33. The variable resistor R33 can change the resistance value within a range of 0 kΩ to 10 kΩ, for example.

  The constant temperature heating device 400 can continuously change the set temperature by adjusting the variable resistor R33.

[Fifth Embodiment]
FIG. 7 shows a constant temperature heating device 500 according to the fifth embodiment. However, FIG. 7 is an equivalent circuit diagram of the constant temperature heating device 500.

  The constant temperature heating device 500 includes the heater unit 3 in which the PTC thermistor elements PTC1, PTC2, and PTC3 of the constant temperature heating device 100 according to the first embodiment shown in FIGS. 1 and 2 are connected in parallel to one heater element. 13 replaced.

  Although not shown, the heater element 13 has a structure in which a heating resistor portion is formed on a substrate and the heating resistor portion is covered with an insulating and heat-resistant outer layer material.

  In the present invention, the configuration of the heater section (heat generating element) is arbitrary, and various heat generating elements can be used.

[Sixth Embodiment]
As 6th Embodiment, the hair dryer toy (not shown) was produced using the constant temperature heating apparatus 100 concerning 1st Embodiment.

  In the hair dryer toy, the constant temperature heating device 100 is arranged inside a cylindrical main body, and warm air can be blown out by a propeller that is rotated by a motor that is also arranged inside the main body.

  Since the hair dryer toy according to the present embodiment uses the constant temperature heating device 100 according to the first embodiment, the safety is high, the power consumption is small, and the response speed is fast. The wind blows.

[Seventh Embodiment]
As a seventh embodiment, a pachinko device (not shown) was manufactured using the constant temperature heating device 100 according to the first embodiment.

  In the pachinko machine, the constant temperature heating device 100 is embedded in the vicinity of the handle held by the player, and when winning (when winning a win) or when winning is confirmed (when winning is confirmed afterwards) It is possible to generate a fever and notify the player of winning or winning confirmation.

A thermo tape whose color changes with temperature may be attached in the vicinity where the constant temperature heating device 100 is buried, and the player may be notified of winning or winning confirmation by the color.
The pachinko machine according to the present embodiment generates heat and informs the player of winning or confirming winning, so that the gameability (game fun) is improved.

[Eighth Embodiment]
As an eighth embodiment, a spoon (not shown) for sipping cold food such as ice cream was produced using the constant temperature heating device 100 according to the first embodiment. Specifically, the constant temperature heating device 100 was embedded in the vicinity of the heel of the spoon.

  Since the spoon of this embodiment uses the constant temperature heating device 100 according to the first embodiment, the safety is high and the power consumption is small. In addition, since the spoon of this embodiment has a high response speed, the temperature rises in a short time after the switch is turned on, and it can be easily sown while melting low-temperature foods such as ice cream.

The application products using the constant temperature heating devices 100 to 500 according to the first embodiment to the fifth embodiment and the constant temperature heating devices 100 according to the sixth embodiment to the eighth embodiment have been described above.
However, the present invention is not limited to the contents described above, and various modifications can be made in accordance with the spirit of the invention.

  For example, in the constant temperature heating devices 100 to 400, three PTC thermistor elements PTC1 to PTC1 are connected in parallel as the heating elements. However, the heating elements are not limited to PTC thermistor elements, and heaters such as the constant temperature heating device 500 are used. It may be an element or other types. Even when PTC thermistor elements are used, the number is not limited to three, and may be one, two, or four or more. That is, it can be arbitrarily selected according to the resistance value of the PTC thermistor element to be used, the required amount of heat generation, and the like.

  Further, in the constant temperature heating devices 100 to 500, all of the temperature detection voltage dividing circuit, the comparison voltage dividing circuit, and the heating elements (PTC thermistor elements PTC1 to 3 and heater element 13) are supplied from one power source Vcc (DC 6V). Although electric power is supplied, these may be supplied from separate power sources. Further, the voltage applied to the temperature detection voltage dividing circuit, the comparison voltage dividing circuit, and the heating element is not limited to 6V. Further, different voltages may be applied to the temperature detection voltage dividing circuit, the comparison voltage dividing circuit, and the heating element.

  Further, in the constant temperature heating devices 100 to 500, the NTC thermistor element NTC1 having a resistance value of 5.6 kΩ at 40 ° C. is used, but the resistance temperature characteristics of the NTC thermistor element to be used are arbitrary. It is not limited to what was used.

DESCRIPTION OF SYMBOLS 1 ... Heat insulating board 2 ... Circuit board 3 ... Heater part 4a, 4b, 4c ... Circuit wiring 5a, 5b, 5c ... Lead wire 13 ... Heater element Vcc ... Power supply SW1, SW2, SW3 ... switches PTC1, PTC2, PTC3 ... PTC thermistor elements (heating elements)
NTC1 ... NTC thermistor element Cmp1 ... comparator element Q1 ... switching elements R1, R2, R3, R4, R5, R11, R12, R13, R31, R32 ... resistance elements 100, 200, 300, 400 500 ... constant temperature heating device

Claims (9)

A constant temperature heating device that generates heat at a predetermined set temperature or a temperature near the set temperature,
A power source, a heating element, a switching element, a comparator element, an NTC thermistor element, and a plurality of resistance elements;
The heating element generates heat from the power source,
The switching element is inserted between the power source and the heating element,
The comparator element controls on and off of the switching element;
The NTC thermistor element is disposed in the vicinity of the heating element and is thermally coupled to the heating element so as to approach the same temperature as the heating element, and includes a resistance value at the set temperature as a threshold resistance value,
The NTC thermistor element and at least one of the resistance elements are connected in series, and a constant voltage is applied to form a temperature detection voltage dividing circuit,
A temperature detection voltage is output from a connection point between the NTC thermistor element and the resistance element of the temperature detection voltage dividing circuit.
At least two of the resistance elements are connected in series and a constant voltage is applied to form a comparative voltage dividing circuit;
A comparison voltage is output from a connection point between the one resistive element and the other resistive element of the comparative voltage dividing circuit,
The resistance values of the resistance element of the temperature detection voltage dividing circuit and the resistance element of the comparison voltage dividing circuit, and the resistance value applied to the temperature detection voltage dividing circuit and the comparison voltage dividing circuit, respectively. The voltage is set so that the temperature detection voltage = the comparison voltage when the temperature of the NTC thermistor element is the set temperature and the resistance value of the NTC thermistor element is the threshold resistance value,
When the temperature of the NTC thermistor element is lower than the set temperature and the resistance value of the NTC thermistor element is larger than the threshold resistance value, the temperature detection voltage> the comparison voltage, and the NTC thermistor element When the temperature is higher than the set temperature and the resistance value of the NTC thermistor element is smaller than the threshold resistance value, the temperature detection voltage <the comparison voltage or the temperature of the NTC thermistor element is When the resistance value of the NTC thermistor element is lower than the set temperature and greater than the threshold resistance value, the temperature detection voltage <the comparison voltage, and the temperature of the NTC thermistor element is higher than the set temperature. When the resistance value of the NTC thermistor element is lower than the threshold resistance value, the temperature detection voltage> the comparison voltage Yes,
The comparator element compares the temperature detection voltage with the comparison voltage, and when the temperature of the NTC thermistor element is lower than the set temperature and the resistance value of the NTC thermistor element is larger than the threshold resistance value. In addition, when the switching element is turned on, the temperature of the NTC thermistor element is higher than the set temperature, and the resistance value of the NTC thermistor element is smaller than the threshold resistance value, the constant temperature heat generation that turns off the switching element. apparatus. Furthermore, a heat insulating plate made of metal is provided,
The constant temperature heating device according to claim 1, wherein the NTC thermistor element and the heating element are mounted on the heat retaining plate via an insulating member.   The constant temperature heating device according to claim 1 or 2, wherein the heating element is a PTC thermistor element.   4. The constant temperature heating device according to claim 1, wherein the comparison voltage is variable, and the set temperature can be changed by changing the threshold resistance value of the NTC thermistor element. 5.   A series circuit of a plurality of resistance elements and switches connected in series is replaced with at least one resistance element of the voltage dividing circuit for comparison, and the comparison circuit is switched by switching the switch. The constant temperature heating device according to claim 4, wherein the voltage is variable.   5. The constant temperature heating device according to claim 4, wherein a variable resistor is replaced with at least one of the resistance elements of the comparison voltage dividing circuit, and the variable voltage is adjusted by adjusting the variable resistor. .   A toy comprising the constant temperature heating device according to any one of claims 1 to 6.   A gaming machine comprising the constant temperature heating device according to any one of claims 1 to 6.   Tableware provided with the constant temperature heating device according to any one of claims 1 to 6.

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