JP2012217563A - Infrared ray clinical thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infrared ray clinical thermometer for measuring the correct temperature of a human body, which is not influenced by a distance, through the use of an infrared ray sensor.SOLUTION: Capacitance when a proximity sensor constituted by a ground electrode 5 and an electrode S7 approaches a human body is measured. Prestored prescribed capacitance when the proximity sensor is brought into contact with the human body is compared with the capacitance measured by the proximity sensor. When the measured capacitance becomes the prescribed capacitance, it is determined that a sensor body is brought into contact with the human body. The infrared dose from the infrared ray sensor 3 in this case of determination is measured. The body temperature based on the measured infrared dose is calculated and displayed in a liquid crystal display unit.

Description

  The present invention relates to an infrared thermometer that measures body temperature using an infrared sensor.

  Those using infrared sensors as thermometers to measure body temperature can measure body temperature quickly, so it is very effective for measuring body temperature of infants and infants who are easy to cry, sleep or stay still It is.

  An infrared sensor measures the amount of infrared rays emitted from a measurement target part such as the skin of a human body and measures the temperature of the measurement target part, that is, the body temperature. The infrared ray is inversely proportional to the square of the distance. Since it attenuates, it is required to accurately measure the distance between the infrared sensor and the measurement target part or to measure the amount of infrared light while keeping the distance between the measurement target part constant.

  Therefore, conventionally, the measurement person has to set or measure the distance between the infrared sensor and the measurement target part by “approximate how many centimeters” or “adjust the light mark”. The place to rely on was great.

JP 2005-342376 A

  As described above, conventionally, the distance between the infrared sensor and the measurement target part is set or measured by the measurer as “approx. How many centimeters” or “adjust the light mark”. Therefore, many errors occur in the distance between the infrared sensor and the measurement target part, and it is difficult to measure an accurate body temperature.

  The present invention has been made in view of the above, and an object of the present invention is to provide an infrared thermometer capable of measuring an accurate body temperature without being influenced by the distance to the measurement target portion. .

  In order to achieve the above object, the infrared thermometer according to claim 1 is an infrared thermometer that measures body temperature using an infrared sensor, and is a contact determination means that determines that a sensor body incorporating the infrared sensor has contacted a human body. And an infrared amount measuring means for measuring the amount of infrared rays from the infrared sensor when the contact determination means determines that the sensor body has contacted the human body, and a body temperature based on the amount of infrared rays measured by the infrared amount measuring means. The gist is to have a body temperature calculating means for calculating.

  In the infrared thermometer according to claim 1, to measure the amount of infrared rays from the infrared sensor when it is determined that the sensor body incorporating the infrared sensor has contacted the human body, and to calculate the body temperature based on the measured amount of infrared rays Measure body temperature, such as infants and infants who are disgusted by turning their faces away, touching objects such as thermometers, moving their faces reflectively, crying easily, and still The body temperature of an infant can be measured reliably and easily without failure.

  The infrared thermometer according to claim 2, wherein the contact determination unit measures a capacitance when the sensor body is close to a human body, and measures a distance between the sensor body and the human body based on the capacitance. A proximity sensor, storage means for storing a predetermined capacitance when the sensor main body comes into contact with a human body, and a capacitance measured by the proximity sensor are compared with the predetermined capacitance and measured. And a means for determining that the sensor main body is in contact with the human body when the electrostatic capacity reaches the predetermined electrostatic capacity.

  In the infrared thermometer according to claim 2, the capacitance when the sensor body is close to the human body is measured, the measured capacitance is compared with a predetermined capacitance stored in advance, and the measured capacitance When the sensor reaches a predetermined capacitance, it is determined that the sensor body has touched the human body.Therefore, it is possible to reliably detect that the sensor body has touched the human body and measure the body temperature. It is very effective for measuring body temperature of infants and infants who are not or still.

  The infrared thermometer according to claim 3, wherein the contact determination unit includes a proximity sensor that measures a proximity distance in which the sensor main body is close to the human body, and a predetermined distance in which the proximity distance measured by the proximity sensor is relatively close to the human body. When the temperature is below the distance, the temperature monitoring means for monitoring the temperature calculated by the body temperature calculating means, and the sensor body is in contact with the human body when the temperature monitored by the temperature monitoring means is close to a predetermined temperature. And having means for determining.

  In the infrared thermometer according to claim 3, when the proximity distance becomes equal to or less than a predetermined distance, the temperature calculated based on the amount of infrared rays from the infrared sensor is monitored, and the monitored temperature is close to the predetermined temperature. Since it is determined that the sensor body has touched the human body, it is possible to reliably detect when the sensor body touches the human body and measure body temperature, for example, toddlers who hate face back, are easy to cry, or do not stay still It is very effective for measuring body temperature of infants and infants.

  The gist of the infrared thermometer according to claim 4 is that the vicinity of the predetermined temperature is a temperature considered as a body temperature.

  In the infrared thermometer according to claim 4, since the vicinity of the predetermined temperature is a temperature that is considered to be a body temperature, and when the predetermined temperature is reached, it is determined that the sensor body is in contact with the human body. Excluding cases such as air temperature, it is effective to determine that the detected temperature is considered to be body temperature when it is in contact with the human skin. It is very effective for measuring the body temperature of infants, infants, etc. who are disgusted, easy to cry, or are still still.

  The infrared thermometer according to claim 5 is characterized in that the predetermined distance is 5 millimeters to 5 centimeters.

  In the infrared thermometer according to claim 5, since the predetermined distance is 5 millimeters to 5 centimeters, monitoring the temperature after reaching the predetermined distance is also effective for improving the temperature measurement. It is valid.

  According to the present invention, the amount of infrared rays from the infrared sensor when it is determined that the sensor body incorporating the infrared sensor has contacted the human body is measured, and the body temperature is calculated based on the measured amount of infrared rays. For example, it is very effective to measure the body temperature of infants and infants who are disgusted by turning their faces, touching objects such as thermometers, moving their faces in a reflective manner, crying easily, and stillness. Yes, it is possible to measure the temperature of an infant or the like without failing reliably and easily.

  Further, according to the present invention, the capacitance when the sensor main body is close to the human body is measured, and the measured capacitance is compared with a predetermined capacitance stored in advance. When it reaches the specified capacitance, it is determined that it has touched the human body, so it can be reliably detected that it has touched the human body, and body temperature can be measured, for example, disliked by facing away, easy to cry, still It is very effective for measuring body temperature of infants and infants who are not.

  Furthermore, according to the present invention, when the proximity distance becomes equal to or less than the predetermined distance, the temperature calculated based on the amount of infrared rays from the infrared sensor is monitored, and when the monitored temperature becomes close to the predetermined temperature. Because it is determined that it has touched the human body, it is possible to reliably detect when it touches the human body and measure body temperature, such as infants and babies who are disgusted, easy to cry, or do not stay still It is very effective for measuring body temperature.

It is a perspective view which shows the infrared thermometer concerning one Embodiment of this invention. It is a perspective view which shows the state which removed the cover of the infrared thermometer shown in FIG. It is the rear view, side view, and front view which show the rear surface of the infrared thermometer shown in FIG. 1, the side surface, and the front surface, respectively. It is a circuit diagram which shows a part of circuit of the infrared thermometer shown in FIG. It is a graph which shows the relationship with the electrostatic capacitance with respect to the distance between the proximity sensor currently used for the infrared thermometer shown in FIG. 1, and a measurement object part. It is a figure which shows the electric current which flows into the light emitting diode (LED) used for the infrared thermometer shown in FIG. 1, and a light control state. It is a circuit diagram of the whole infrared thermometer shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an infrared thermometer according to an embodiment of the present invention. Since the infrared thermometer 1 shown in the figure is configured in a slightly vertical barrel shape, it is easy to pinch a slightly depressed portion in the center with a finger. Then, by pinching the concave portion, the body temperature is measured, for example, the center part of the forehead and the body temperature is measured. When the body temperature is contacted, the body temperature is measured. Therefore, the body temperature can be accurately measured without being influenced by the distance from the human body as in the prior art.

  The infrared thermometer 1 shown in FIG. 1 has an infrared sensor for measuring body temperature, and a proximity sensor for measuring a distance between a measurement target portion of the human body and a tip portion of the infrared thermometer 1. 1, the substantially central portion of the front side of the sensor body of the infrared thermometer 1 shown in FIG. 1, that is, the substantially central portion of the tip portion facing downward to the right in FIG. Infrared sensor 3 is attached to. And the ground electrode 5 and electrode S7 which comprise a proximity sensor around this infrared sensor 3 (refer FIG. 2, FIG.1 and FIG.3 (c) shows the electrode exterior 7a which is a protection part of electrode S7). Is provided so that the proximity of the infrared sensor 3 to a measurement target part such as a human body can be accurately detected.

  FIG. 2 is a perspective view showing a state in which the cover of the infrared thermometer 1 shown in FIG. 1 is removed. In addition to FIG. 1, as shown in FIG. 2, the mortar-shaped portion around the infrared sensor 3 is A ground electrode 5 of the proximity sensor is formed, and a ring-shaped portion around the ground electrode 5 forms an electrode S7 of the proximity sensor. Accordingly, when the infrared sensor 3 of the infrared thermometer 1 shown in FIGS. 1 and 2 or the tip of the proximity sensor having the ground electrode 5 and the electrode S7 are brought close to the human body, the proximity sensor provided at the tip of the human body measures the human body. While measuring the distance to the target part, the infrared sensor 3 detects infrared rays from the human body, and the body temperature can be measured from the detected amount of infrared rays.

  The ground electrode 5 is provided around the infrared sensor 3 to form a sensor frame for stabilizing the temperature of the infrared sensor 3 and reflecting radiation from the side surface. It is used as a substitute and secures a sufficient area as the ground electrode 5.

  3A, 3B, and 3C are a rear view, a side view, and a front view, respectively, showing a rear surface, a side surface, and a front surface of the infrared thermometer 1 shown in FIG. As can be seen from the figure, on the rear surface of the infrared thermometer 1 shown in FIG. 3 (a), a liquid crystal display 11 made of liquid crystal (LCD) for displaying body temperature is provided, and above the liquid crystal display 11, A power switch 13 having a wide pressing surface is provided. When the power switch 13 is turned on, the infrared thermometer 1 is activated to measure the body temperature, and the measured body temperature is displayed on the liquid crystal display 11.

  Further, a battery housing portion 15 is provided on the side surface of the infrared thermometer 1 shown in FIG. 3B. A battery such as a button battery of 1.5 to 3 volts is inserted into the battery housing portion 15 and the lid is screwed. By doing so, it functions as a power source of the infrared thermometer 1 and becomes operable.

  FIG. 4 is a circuit diagram showing a part of the circuit of the infrared thermometer 1 shown in FIG. The circuit shown in the figure is based on the capacitance detected by the proximity sensor and a part of the measurement circuit for measuring the distance between the measurement target portion of the human body and the tip portion of the infrared thermometer 1 having the proximity sensor and the infrared ray. It includes a notification function indicating completion of body temperature measurement by the thermometer 1 and part of a circuit for a backlight for liquid crystal of the liquid crystal display 11.

  That is, the electrostatic capacitance between the electrode S7 constituting the proximity sensor and the ground electrode 5 changes depending on the distance between the measurement target portion of the human body to which the proximity sensor approaches and the proximity sensor. When the capacitance between the electrode S7 and the ground electrode 5 is supplied to the input of the Schmitt trigger CMOS inverter U1 whose input is connected to the resistor R1 as shown in FIG. 4, the Schmitt trigger CMOS inverter U1 has the following formula: It oscillates at the oscillation frequency F shown in FIG.

F = 1 / (0.8 × Cf × R1)

In this equation, Cf is a capacitance including the capacitance between the electrode S7 constituting the proximity sensor and the ground electrode 5 and the stray capacitance of the wiring, and the human body to which the proximity sensor approaches as described above. 4 is a capacitance that changes depending on the distance between the measurement target portion and the proximity sensor, and R1 is a resistance value of the resistor R1 in FIG.

  The output signal A of the Schmitt trigger CMOS inverter U1 that oscillates at the oscillation frequency F in this way is supplied to a microcontroller (hereinafter abbreviated as MCU) using a microprocessor to be described later, and the oscillation frequency F is counted by this MCU. Based on this count value, the distance between the human body and the proximity sensor at the tip of the infrared thermometer 1 is calculated.

  When the proximity sensor is close to the skin of the human body that is the measurement target, such as the forehead, for example, when approaching within about 5 mm, the capacitance C is proportional to the area of the electrode S7 of the proximity sensor, It is inversely proportional to the distance to the human skin that is the measurement target, and is close to the following equation.

C = ε ₀ S / 2t (F)

In this equation, S is the area of the proximity sensor electrode, t is the distance between the human skin, which is the measurement target, and the proximity sensor, ε0 is the relative permittivity, and in the air Then it is 1.

  If the proximity sensor is separated from the skin of the human body, which is the measurement target portion, the function as the surface of the proximity sensor cannot be expected, and the capacitance is extremely reduced. The capacitance of the proximity sensor at this time is simply proportional to the area of the electrode of the proximity sensor, and the capacitance is the sum of the floating capacitance of the wiring and the surface area of the electrode of the proximity sensor. The capacitance does not change even if the distance to the skin etc. changes.

  FIG. 5 is a graph of a capacitance change curve showing the relationship between the capacitance and the distance between the proximity sensor and the measurement target unit. As shown in the figure, when the distance between the proximity sensor and the measurement target portion is 5 mm or less, the capacitance is proportional to the area of the proximity sensor electrode as shown in the above formula, and the measurement target Although it is inversely proportional to the distance to the part, if the proximity sensor is separated from the measurement target part, it cannot be expected to function as a surface of the proximity sensor, and the capacitance is extremely reduced.

  Returning to FIG. 4, the output signal A of the Schmitt trigger CMOS inverter U1 that oscillates at the oscillation frequency F is supplied to the MCU as described above, and the distance between the measurement target portion and the proximity sensor is calculated. In addition, in order to increase the voltage of the battery accommodated in the battery accommodating portion 15 to a voltage of 6 volts for lighting a blue light emitting diode (LED) for notification of completion of body temperature measurement described later. To the booster circuit.

  That is, in FIG. 4, the output signal A of the Schmitt trigger CMOS inverter U1 is supplied to the CMOS inverter U2 and inverted and amplified in addition to the MCU, and alternately alternates between the amplitude of the voltage E of the battery 3 volts and 0 volts. And is supplied to the capacitor C1. The capacitor C1 is charged to approximately 3 volts of the voltage E of the battery 21 via the subsequent Schottky diode D1.

  That is, when the output of the CMOS inverter U2 is 0 volt, the terminal on the 2 side of the capacitor C1 has a positive polarity, the terminal on the 1 side of the capacitor C1 has a negative polarity, and the voltage E of 3 volts is the capacitor C1. Is charged. When the output of the CMOS inverter U2 is 3 volts of the voltage E, the voltage charged in the capacitor C1 is connected in series with the output of the CMOS inverter U2, so that the terminal on the 2 side of the capacitor C1 has 3 volts A voltage 2E (voltage E × 2 = 2E) of 6 volts, which is twice the voltage E, is generated, and the voltage 2E of 6 volts is charged to the capacitor C2 via the Schottky diode D1.

  Thus, 6 volts of the voltage 2E charged in the capacitor C2 is supplied to, for example, a blue light emitting diode (LED) D2 for notification of completion of the body temperature measurement. A resistor R2 and a dimming transistor Q1 are connected in series to the light emitting diode D2, and a current flowing through the light emitting diode D2 is determined by the resistor R2. The dimming transistor Q1 is controlled to be turned on and off by the dimming control signal B from the MCU supplied to the base of the dimming transistor Q1, and is controlled to the maximum brightness when it is on.

  That is, the current flowing through the light emitting diode D2 is controlled as shown in FIG. 6 by the on / off control of the dimming transistor Q1 based on the dimming control signal B from the MCU, and as shown in FIG. The dimming when the current flows continuously is maximum, the dimming when the on / off control is performed becomes 1/3, and when the current is interrupted, the light emitting diode D2 is turned off and the dimming becomes zero. The repetition cycle of the on-off control in which the dimming is 1/3 is set to, for example, 1.6 mS or less so that the human eye does not feel flicker. The light emitting diode D2 is also used as a liquid crystal backlight of the liquid crystal display 11. Due to the combined use with the backlight, the light-emitting diode D2 can be dimmed in multiple stages as described above.

  FIG. 7 is an overall circuit diagram of the infrared thermometer 1 of the present embodiment. Specifically, based on the capacitance detected by the proximity sensor described above, the tip of the infrared thermometer 1 having the measurement target portion of the human body and the proximity sensor. A part of a measurement circuit for measuring a distance between the part, a notification function indicating completion of body temperature measurement by the infrared thermometer 1, a part of a circuit for a backlight for liquid crystal of the liquid crystal display 11, and the above-mentioned It is a circuit diagram of the whole infrared thermometer 1 of this embodiment containing MCU.

  In FIG. 7, a part of the measurement circuit that measures the distance between the measurement target portion of the human body and the tip portion of the infrared thermometer 1 having the proximity sensor based on the capacitance detected by the proximity sensor is a proximity sensor. As a backlight / illumination booster circuit 73, a booster circuit shown as a circuit 71 and for a notification function indicating completion of body temperature measurement by the infrared thermometer 1 and a part of a backlight circuit for liquid crystal of the liquid crystal display 11 is used. It is shown.

  The output signal A of the Schmitt trigger CMOS inverter U1 from the proximity sensor circuit 71 is supplied to the MCU 83, and as described above in the MCU 83, between the measurement target portion of the human body and the tip portion of the infrared thermometer 1 having the proximity sensor. A distance is calculated. Further, the dimming control signal B is output from the MCU 83 and supplied to the dimming transistor Q1, and the dimming transistor Q1 controls the light emitting diode D2 via the resistor R2, and the dimming described above. Light control and backlight control of the liquid crystal constituting the liquid crystal display 11 are performed. The light emitting diode D2 is supplied with a voltage boosted to 6 volts from the backlight / illumination booster circuit 73. Further, the MCU 83 is connected to the power switch 13 and a 3-volt battery 21.

  Further, the infrared sensor 3 is a thermopile type constituted by connecting a plurality of thermocouples in series. The amount of infrared rays measured by the thermopile type infrared sensor 3 passes through an analog switch 77. After being amplified by the OP amplifier 79, it is converted into a digital signal by the AD conversion circuit 81 and supplied to the MCU 83. As described above, the MCU 83 calculates the body temperature, that is, the body temperature of the measurement target portion of the human body based on the digital signal from the infrared sensor 3, and displays the calculated body temperature on the liquid crystal display 11.

  In addition to the blue light emitting diode D2, the MCU 83 has a buzzer 87 as a notification function indicating the completion of body temperature measurement. This buzzer 87 is connected to the MCU 83 via a resistor 89, and is ringed by the control of the MCU 83. To notify the completion of temperature measurement.

  Next, the operation of the infrared thermometer configured as described above will be described.

  First, when the power switch 13 of the infrared thermometer 1 is turned on and the operating voltage is supplied from the 3 volt battery 21 in the battery housing 15 to the infrared thermometer 1, the infrared sensor 3, the ground electrode 5, and the electrode of the infrared thermometer 1 The proximity sensor composed of S7 starts to operate. At this time, as shown in FIG. 1, the concave body portion where the battery housing portion 15 of the barrel-shaped infrared thermometer 1 is pinched with a finger or the like, and the infrared thermometer 1 When the tip portion is brought closer to a measurement target portion such as a forehead of a human body, the MCU 83 is connected to the measurement target portion based on the capacitance between the ground electrode 5 and the electrode S7 of the proximity sensor at the tip portion. Monitor the distance to the proximity sensor.

  More specifically, the proximity sensor includes a Schmitt-trigger CMOS inverter U1 in the proximity sensor circuit 71 according to the capacitance between the electrode S7 and the ground electrode 5 that varies with the distance between the measurement target portion and the proximity sensor. Since the oscillation frequency F changes, the output signal A of the Schmitt trigger CMOS inverter U1 whose oscillation frequency changes is supplied to the MCU 83 and counted. Based on the counting result, the MCU 83 determines the measurement target portion and the tip of the infrared thermometer 1. Monitoring is continued while calculating the distance to the portion, and it is monitored whether or not this distance has become a predetermined distance, for example, 5 cm or less.

  When the MCU 83 detects that the distance between the measurement target portion and the distal end portion of the infrared thermometer 1 has become a predetermined distance, for example, 5 cm or less, the infrared sensor 3 starts measuring infrared rays from this point. The temperature of the measurement target portion is detected based on the amount of infrared light measured by the infrared sensor 3. That is, the amount of infrared rays measured by the infrared sensor 3 is supplied to the MCU 83 as a digital signal via the analog switch 77, the OP amplifier 79, and the AD conversion circuit 81, so that the MCU 83 determines the measurement target unit based on this digital signal. Calculate the temperature.

 Here, the predetermined distance may be 5 cm or less, for example, 5 mm or less depending on the detection capability of the proximity sensor.

  Further, the MCU 83 monitors the distance between the measurement target portion and the proximity sensor based on the capacitance from the proximity sensor as described above, that is, the oscillation frequency changes based on the capacitance from the proximity sensor circuit 71. The capacitance from the proximity sensor is compared with a predetermined capacitance while monitoring the distance between the measurement target portion and the proximity sensor based on the output signal A of the Schmitt trigger CMOS inverter U1 of the proximity sensor circuit 71. Whether or not the predetermined capacitance is reached is detected. This predetermined capacitance is the capacitance when the proximity sensor contacts the human skin, which is the measurement target part, and this predetermined capacitance is stored in advance in the MCU 83 in a memory or the like. is there.

  In this way, the MCU 83 compares the capacitance from the proximity sensor with the predetermined capacitance, and when detecting that the capacitance from the proximity sensor has reached the predetermined capacitance, The temperature measured by the infrared sensor 3 at this time is determined by determining that the temperature of the infrared sensor 3 at the time of contact is the body temperature that is the measurement target part. Is displayed on the liquid crystal display 11 as a body temperature. Along with this body temperature measurement and display, the blue light emitting diode D2 is turned on and the buzzer 87 is sounded to notify the user that the body temperature measurement has been completed.

  In this case, when the temperature measured using the infrared sensor 3 is 28 degrees or higher, this temperature is considered to be the body temperature of the measurement target part of the human body. For example, it is ignored because it is touching clothes or hair or placed on a desk.

  Furthermore, in the above-described embodiment, when the MCU 83 detects that the distance between the measurement target portion and the tip portion of the infrared thermometer 1 has become a predetermined distance or less, the infrared sensor 3 measures the amount of infrared rays from this point. In addition to detecting the temperature of the measurement target part based on the amount of this infrared ray, the capacitance from the proximity sensor is compared with a predetermined capacitance, and when this predetermined capacitance is reached However, the proximity sensor is not limited to the one based on a predetermined capacitance as described above. When the detected temperature of the measurement target part is considered to be body temperature, it is determined that the tip of the infrared thermometer 1 is in contact with the measurement target part, for example, the skin of the human body, and the body temperature measurement process may be performed. Possible That.

  Specifically, when the detected temperature is considered to be a body temperature, the MCU 83 determines that the tip portion of the infrared thermometer 1 is in contact with the skin of a human body that is a measurement target portion, for example. Then, the temperature by the infrared sensor at the time of the contact is considered as the body temperature that is the measurement target part, and this body temperature is displayed on the liquid crystal display 11. Along with this body temperature measurement and display, the blue light emitting diode D2 is turned on and the buzzer 87 is sounded to notify the user that the body temperature measurement has been completed.

  Note that the body temperature is extremely low when it is considered that the body temperature measurement is performed in a normal measurement environment such as an examination room, for example, due to being lost in a snowy mountain, drifting in the sea or river for a long time, or other factors. Except for the case where the body temperature is reached, it is considered to be, for example, about 32 to 43 degrees. However, as described above, when the detected temperature is considered to be the body temperature, It is effective to determine that there is. In the determination that the detected temperature is the body temperature, the threshold value for this determination is optimized by the outside air temperature. That is, the MCU 83 determines that it is not a body temperature when the detected temperature is lower than the normal body temperature, for example, 28 degrees, and ignores this temperature. Specifically, when the infrared sensor 3 at the tip of the infrared thermometer 1 is not yet in contact with the skin of the human body, the infrared sensor 3 is measuring the ambient outside air temperature. When the outside air temperature is, for example, 10 degrees to 28 degrees, it is clearly considered not to be a body temperature. In addition, when the outside air temperature is high and around 30 degrees, it can be corrected by providing a function for measuring the outside air temperature.

  The infrared sensor 3 reacts to a conductive substance, but does not react to a desk such as wood or resin. Furthermore, it reacts with a metal desk or the like, but when the room temperature is not high, the temperature does not rise to about body temperature, so the temperature at this time is ignored.

  Further, as described above, when the MCU 83 detects that the distance between the measurement target portion and the tip portion of the infrared thermometer 1 has become a predetermined distance, for example, 5 cm or less, the amount of infrared rays by the infrared sensor from this time point. The measurement of the temperature of the object to be measured is started based on the measured amount of infrared rays. From this time, the tip of the infrared thermometer 1, that is, the infrared sensor 3 is not brought into contact with the skin of the human body. While scanning the surface of the skin, look for the optimal position, that is, the position close to body temperature, specifically the center position of the forehead, etc., and contact the infrared sensor with the human body at this position and measure the body temperature can do. The artery in the vicinity of the central part, which is the specific position of the human forehead, has blood vessels leading to the human brain, and this part always has a constant blood flow without being affected by body temperature adjustment, and the deep part of the human body It represents temperature.

  As described above, in the present embodiment, the body temperature when the infrared sensor 3 of the infrared thermometer 1 comes into contact with the skin of the human body is measured and displayed on the liquid crystal display 11. It is very effective in measuring the body temperature of infants and infants who are not still. That is, when an object touches an infant or baby, the face is reflexively moved, so that the body temperature can be measured simultaneously with the contact as in the infrared thermometer 1 of the present embodiment is very effective, reliable and simple. The body temperature of an infant can be measured without failure.

  The infrared thermometer 1 also has a function of converting and displaying the temperature of the forehead surface to the temperature under the heel, but as described above, at this time, it is necessary to measure at a specific position such as the center of the forehead. is there. This is to measure the temperature derived from the artery in the vicinity of this site.

  Furthermore, in addition to the above-described temperature measurement at the time of contact, the temperature measured before contact, that is, at the position of the contact margin can also be used. From this, the influence of contact can be known and corrected.

  That is, from the temperature before contact and the temperature at the time of contact, the data up to here is the data before contact, and from here it is captured separately from the data after contact. Can be estimated (the effect of the temperature of the body of the infrared thermometer 1).

  Furthermore, if the infrared thermometer 1 main body is further away before the contact, the measurement range is wide, and the narrow range is measured as it approaches (the viewing angle of the thermopile is about 100 degrees). From this situation, it can be influenced by the outside air temperature, or it can be used as a clue to guess individual differences. As a result, if it is known whether the entire forehead has a uniform temperature or a distribution, the correction becomes more accurate in relation to this and the outside air temperature.

  For example, although there is a temperature distribution in the forehead, although it varies depending on the outside air temperature, if there is little distribution at this time, it can be determined that it is not a normal state such as heat generation, individual differences, thick clothing, etc. Is possible.

  An example has been described above, but it goes without saying that the present invention can be modified in any way.

1 Infrared thermometer
3 Infrared sensor 5 Ground electrode 7 Proximity sensor electrode S
7a Electrode exterior 11 Liquid crystal display 13 Power switch 15 Battery compartment 21 Battery 71 Proximity sensor circuit 73 Backlight / illumination booster circuit 77 Analog switch 79 OP amplifier 81 AD converter circuit 83 MCU
87 Buzzer C1, C2 Capacitor D1 Schottky diode D2 Light emitting diode R1, R2 Resistor Q1 Dimming transistor U1 Schmitt trigger CMOS inverter U2 CMOS inverter

Claims (5)

An infrared thermometer that measures body temperature using an infrared sensor,
Contact determination means for determining that the sensor body incorporating the infrared sensor has contacted the human body;
An infrared amount measuring means for measuring the amount of infrared rays from the infrared sensor when it is determined that the sensor main body is in contact with the human body by the contact determining means;
An infrared thermometer comprising: a body temperature calculating means for calculating a body temperature based on the amount of infrared rays measured by the infrared amount measuring means. The contact determination means includes
A proximity sensor that measures a capacitance when the sensor body approaches the human body, and measures a distance between the sensor body and the human body based on the capacitance;
Storage means for storing in advance a predetermined capacitance when the sensor body contacts the human body;
Means for comparing the capacitance measured by the proximity sensor with the predetermined capacitance, and determining that the sensor body is in contact with the human body when the measured capacitance reaches the predetermined capacitance; The infrared thermometer according to claim 1, comprising: The contact determination means includes
A proximity sensor for measuring a proximity distance in which the sensor body is close to a human body;
Temperature monitoring means for monitoring the temperature calculated by the body temperature calculating means when the proximity distance measured by the proximity sensor is equal to or less than a predetermined distance relatively close to the human body;
The infrared thermometer according to claim 1, further comprising means for determining that the sensor main body is in contact with a human body when the temperature monitored by the temperature monitoring means is close to a predetermined temperature.   The infrared thermometer according to claim 3, wherein the vicinity of the predetermined temperature is a temperature considered to be a body temperature.   The infrared thermometer according to claim 2, wherein the predetermined distance is 5 millimeters to 5 centimeters.

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