JP5757856B2 - Electronic thermometer - Google Patents

Description

  The present invention relates to an electronic thermometer, and more particularly to an electronic thermometer that reliably detects a state in which a temperature measurement is approaching an equilibrium temperature.

  Electronic thermometers are broadly classified into an actual measurement thermometer and a predictive thermometer in the measurement method, and are roughly classified into a measurement site when measuring in the mouth and when measuring in the axilla.

  Here, the body temperature is the temperature of the central part of the body, and is different from the temperature of the skin surface of the axilla that is changing under the influence of the outside air temperature. However, when the thermometer is applied to the heel and the heel is closed and heated for a certain time, the temperature displayed by the thermometer approaches the “equilibrium temperature”. This equilibrium temperature is the temperature at the center of the body, and it takes 10 minutes or more from the start of warming to the equilibrium temperature.

  That is, the actual measurement thermometer basically requires a temperature measurement time of 10 minutes or more in order to accurately measure the equilibrium temperature.

  By the way, the predictive thermometer predicts and displays the equilibrium temperature based on the measured temperature using the built-in predictive function of the thermometer, and the temperature measurement time is greatly reduced to 10 to 90 seconds. .

  In the actual measurement thermometer, it takes a relatively long time for the measured temperature to reach the equilibrium temperature as described above, so when the temperature rise in the middle becomes moderate, inform the measurer that the temperature is approaching the equilibrium temperature. A notification buzzer may sound. The average time from the start of the temperature measurement to the issue of the notification buzzer is about 2 to 5 minutes. The measurer can know the temperature close to the body temperature from the display temperature when the notification buzzer sounds. In addition, it is necessary to continue measuring after that in order to detect the temperature correctly.

  In the actual measurement thermometer as described above, one technical point is to issue a notification buzzer under what conditions.

  As a document disclosing this point, there is an electronic thermometer disclosed in Patent Document 1.

  In the electronic thermometer of Patent Document 1, the measurement temperature of the temperature sensor is stored for each sampling timing, the change rate of the measurement temperature is calculated for each sampling timing, and converged when the change rate equal to or less than a predetermined value continues for a predetermined number of times. That is, it is judged that the body temperature close to the equilibrium temperature has been reached.

Specifically, the measured temperatures at sampling timings 1, 2,..., N−1, n are set to T (1), T (2),. )
In this case, the difference between the measured temperature at a certain sampling timing and the measured temperature before the k sampling timing is defined as a change rate Δ. That is,
Δ = T (n) −T (n−k)
It is.

Then, a determination value α of the change rate Δ for determining convergence is determined in advance,
Δ ≦ α
It is determined that the number of samplings Δ satisfying the condition has converged when the predetermined number of times is continued m times.

  In Patent Document 1, the measured temperature is further peak-held, and each sampling value is updated only when it is larger than the peak value measured before that.

JP 61-002029 A

  By the way, in order to correctly measure the body temperature in the axilla, put the tip of the thermometer into the axilla with the angle between the body axis and the thermometer being about 30 to 45 °, and the elbow of the hand sandwiching the thermometer is in close contact with the flank. It must be completely closed and fixed so that the thermometer does not move during the measurement.

  Conversely, if the initial application is inappropriate, or if the thermometer is displaced due to the person moving the body during measurement, it will be displayed at the timing of the notification buzzer. Body temperature may be inappropriate.

  For example, let us consider a case where the thermometer deviates from the correct position of the axilla and returns to the correct position again due to the movement of the measurer. FIG. 12 shows the change over time of the measured temperature when such a condition occurs.

  In such a case, the normal measurement temperature should change as shown by the dotted line in the figure, but it changes as shown by the solid line due to the deviation. Then, normally, a notification buzzer should have been issued due to the gentle slope at point A at time t2, but a similar slope was calculated at point B, so that a notification buzzer was issued at time t1. There is concern that a buzzer will be emitted. In this case, the measurement temperature to be displayed together with the normal notification buzzer is T2 close to the equilibrium temperature T0, whereas the measurement temperature T1 deviating from the equilibrium temperature T0 is displayed.

  Such a problem occurs because, in the above-described prior art, even when the measured temperature curve deviates from the normal curve, the convergence state occurrence frequency condition m is fixed. This is because a notification buzzer is issued as long as the condition is satisfied.

  This problem, that is, the problem of displaying an inappropriate temperature at the time of notification and giving inaccurate body temperature information to the measurer, is not limited to the case where the thermometer is displaced from the correct position. May occur even when the measured temperature rises gently relative to the normal curve. It can also occur when the environmental temperature at the time of measurement shifts from the normal temperature range to a higher or lower direction and the temperature difference between the environmental temperature and the body temperature becomes large.

  For example, if the method of applying to the axilla is inappropriate, the heat of the body temperature from the skin surface of the axilla to the thermometer becomes difficult to be transmitted, and the rising gradient of the measured temperature becomes gentler than the normal curve. In this case, if the occurrence frequency condition m is fixed, a notification buzzer is issued at the same rate of change as the normal time on the measured temperature curve, but the displayed temperature is the equilibrium temperature. The temperature is farther from. That is, a notification buzzer may be issued in a region that is not sufficiently stable on the measured temperature curve, and inappropriate temperature information may be reported to the measurer.

This is also the case when the temperature of the axilla skin surface is lowered due to the low environmental temperature, the body temperature at the center of the body is not easily transmitted to the temperature sensor through the skin surface of the axilla, and the measured temperature curve becomes smooth. is there.

  As described above, in the prior art, in the case of temperature measurement using an electronic thermometer, if the measurer has moved the position of the thermometer due to movement of the body or the like, the method of applying to the axilla is inappropriate. If the measured temperature rise curve is smoother than usual, or if the measured environment temperature is either higher or lower than expected, that is, if the above is summed up, the measured temperature rise curve is normal. Even if it deviates from what was expected, there was room for improvement in that a notification buzzer was issued at an appropriate temperature.

  The present invention has been made in view of the background art as described above, and is capable of confirming a stable measurement temperature at the time of notification of a buzzer without depending on the handling of an electronic thermometer by a measurer or a measurement environment temperature. It is an object.

In order to solve the above-described problems, an electronic thermometer according to the present invention includes a temperature measurement unit that measures temperature, a storage unit that stores the temperature measured by the temperature measurement unit at each sampling timing, and a measurement stored in the storage unit. A gradient detecting means for calculating a gradient of the measured temperature at each sampling timing based on the temperature; a timing means for measuring a time during which the gradient calculated by the gradient detecting means is equal to or less than a first predetermined value; In the electronic thermometer having a stable detection judgment means for generating a notification signal when the time measured by the time measuring means continues for a predetermined time or more, a slope detecting means is based on the measured temperature at the current sampling timing, The measured temperature at the sampling timing before the first sampling number set in advance Calculated was minus temperature range, when the temperature width is smaller than the second predetermined value determined in advance is not more than a first predetermined value, a stable detection judging means and characterized by increasing the predetermined time measured time To do.

  According to the present invention, even when the measurer moves his / her body or the like, the electronic thermometer deviates from the correct position of the axilla, that is, even when the measured temperature curve deviates from the normally predicted curve, it is determined whether the notification buzzer is issued It is possible to increase or decrease the determination time from the standard value, that is, to protect the issue timing of the notification buzzer so that a stable body temperature can be confirmed at the time of notification.

  Preferably, the timer means further includes an initialization function for returning the timer time to an initial state, and further initializes the timer time of the timer means when the temperature range is smaller than the second predetermined value.

Further, the electronic thermometer of the present invention includes a temperature measuring means for measuring temperature, a storage means for storing the temperature measured by the temperature measuring means for each sampling timing, and a sampling timing based on the measured temperature stored in the storage means. A gradient detecting means for calculating the gradient of the measured temperature every time, a time measuring means for measuring a time during which the gradient calculated by the gradient detecting means is equal to or less than a first predetermined value, and a time measured by the time measuring means In the electronic thermometer having a stability detection determination means for generating a notification signal when it has continued for a predetermined time or more , a current sampling timing calculated after the elapse of a predetermined time after the start of measurement. Sampling timing before the preset second sampling number from the measured temperature Based on the rate of change by subtracting the definitive measurement temperature, increases or decreases the predetermined time.

  In this case, it is possible to display a stable temperature when the notification buzzer is issued even when the measurement temperature curve becomes gentle due to inappropriate application to the axilla.

  In addition, preferably, it further has a table in which the relationship between the environmental temperature at the start of measurement and the increase / decrease value of the predetermined time is determined in advance, and the stability detection determination means refers to the table at the start of measurement and is measured by the temperature measurement means Increase or decrease the predetermined time according to the environmental temperature.

In this case, when the temperature difference between the electronic thermometer and the ambient temperature is large, a stable temperature can be displayed when the notification buzzer is issued. In addition, when the temperature difference between the electronic thermometer and the ambient temperature is small, the timing of the notification buzzer can be advanced to make the electronic thermometer easy to use for the measurer.

  Preferably, the gradient is calculated as a difference obtained by subtracting the highest measured temperature among the measured temperatures sampled up to the current sampling timing from the measured temperature at the current sampling timing.

  According to the electronic thermometer of the present invention, it is possible to check a stable body temperature when notifying the buzzer without depending on the handling of the thermometer by the measurer or the measurement environment temperature.

1 is an external view of an electronic thermometer according to a first embodiment of the present invention. It is a functional block diagram of the electronic thermometer concerning the 1st Embodiment of the present invention. It is a functional block diagram of the principal part in FIG. It is a flowchart of operation | movement of the electronic thermometer concerning the 1st Embodiment of this invention. It is a figure for demonstrating the detection of the shift | offset | difference of the electronic thermometer concerning the 1st Embodiment of this invention. It is a figure for demonstrating the measurement temperature curve when the method of applying the electronic thermometer concerning the 2nd Embodiment of this invention is improper. It is a figure for demonstrating the change rate detection of the electronic thermometer concerning the 2nd Embodiment of this invention. It is a flowchart of operation | movement of the electronic thermometer concerning the 2nd Embodiment of this invention. It is a figure for demonstrating the change of the measurement temperature curve by the environmental temperature of the electronic thermometer concerning the 3rd Embodiment of this invention. It is a table which shows the relationship between the environmental temperature of the electronic thermometer concerning the 3rd Embodiment of this invention, and convergence determination time. It is a flowchart of operation | movement of the electronic thermometer concerning the 3rd Embodiment of this invention. It is a figure which shows the time change of measured temperature when a thermometer deviates from the correct position of an axilla.

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

  First, with reference to FIG. 1 and FIG. 2, the structure of the electronic thermometer 10 concerning this invention is demonstrated.

  In FIG. 1, the external appearance of the electronic thermometer 10 includes a temperature sensor 11a for measuring a body temperature sandwiched between armpits, a display unit 14 for displaying the measured body temperature, a switch 16 for turning on / off the power, and a main body 19. ing.

  Referring to FIG. 2, the hardware of electronic thermometer 10 includes temperature sensor 11a and A / D converter 11b that converts an analog measurement signal from the temperature sensor into a digital signal, a display unit 14, a temperature detector. Is composed of a buzzer 15 for informing that the process is nearing termination, a switch 16, and a CPU 12 connected thereto.

(First embodiment)
In the present embodiment, even when the electronic thermometer 10 deviates from the correct position of the axilla and returns to the correct position again, the notification buzzer is prevented from being issued at an inappropriate timing shown by point B in FIG.

The operation at the time of measuring the body temperature of the electronic thermometer 10 will be described with reference to FIGS. 3 and 4.
FIG. 3 shows a configuration mainly related to body temperature measurement inside the CPU 12.

  In FIG. 3, the temperature measuring unit 11 outputs the temperature measured by the temperature sensor 11a as a digital signal.

  The temperature reading unit 20 reads the temperature measured by the temperature measuring unit 11 at each sampling timing.

  The temperature storage unit 21 is provided inside the CPU 12, stores the measurement value read by the temperature reading unit 20 at each sampling timing, and outputs the measurement value necessary for calculating the gradient to the gradient detection unit 23.

  The gradient detection unit 23 detects the convergence of the temperature detection from the measurement value output from the temperature storage unit 21 and the deviation detection temperature width for determining whether the temperature sensor 11a is out of the appropriate position of the axilla. Is calculated. The gradient detector 23 outputs a signal for resetting the count of the time counter 24 when the calculated gradient does not indicate the convergence of the temperature measurement. In addition, the gradient detection unit 23 outputs the calculated gradient and deviation detection temperature range to the stability detection determination unit 25. Further, if the latest measured value is the maximum measured value, the measured value is output to the maximum measured value storage unit 22.

  The maximum measured value storage unit 22 stores the maximum value of the temperature measured at each sampling timing. After the gradient is calculated by the gradient detector 23, if the measured value at the latest sampling timing is the maximum value, the measured value is received from the gradient detector 23 and updated and stored. Then, the maximum measured value storage unit 22 outputs a signal for turning on the count of the time counter 24 when the stored maximum measured value becomes 32 ° C. or more.

  The time counter 24 is reset in counting at the start of measurement, and starts counting time for determining stable detection using a signal from the maximum measured value storage unit 22. Then, the time counter 24 outputs a count to the stability detection determination unit 25. The time counter 24 resets the counter by the reset signal output from the gradient detection unit 23.

  The stability detection determination unit 25 determines whether or not the temperature measurement is stable based on the gradient calculated by the gradient detection unit 23 and the count of the time counter 24. At this time, the stability detection determination unit 25 changes the convergence determination time for determining whether or not the temperature measurement is stable based on the deviation detection temperature range calculated by the gradient detection unit 23. When the stability detection determination unit 25 determines that the temperature measurement is stable, the stability detection determination unit 25 outputs a count end signal to the buzzer control unit 26.

  The buzzer control unit 26 receives the count end signal from the stability detection determination unit 25 and sounds the buzzer 15.

  Next, in this embodiment, a configuration for preventing the notification buzzer from being issued at an inappropriate timing will be described.

  The time (interval) of the sampling timing at which the temperature reading unit 20 reads the measurement value can be arbitrarily set. In the present embodiment, this is 1 second, and the measured temperature for the “i” -th sampling timing is represented by T (i). That is, T (i) is a measured temperature i seconds after the start of measurement.

The measurement temperature at the sampling timing n is T (n), the maximum measurement value measured before the sampling timing n is Tmax, and the measurement value at the sampling timing j seconds before the sampling timing n is required as T (n−j). The following parameters are defined as follows.
“Gradient” g: g = T (n) −Tmax (° C.)
“Convergence judgment value” α (℃)
“Convergence judgment time” t0 (seconds)
“Drift detection temperature width” Δ1: Δ1 = T (n) −T (n−j) (° C.)
“Deviation detection judgment value” β (° C)
Here, “deviation” in “deviation detection temperature range” and “deviation detection determination value” means that the temperature sensor 11a of the electronic thermometer is out of an appropriate position on the axilla.

  In the present embodiment, the gradient g is detected by the difference between the measured value Tmax obtained by peak-holding and the measured value T (n) at the sampling timing, and the gradient g is within a predetermined convergence determination value α. Sometimes it is determined that the measured temperature curve is becoming gradual. That is, in this embodiment, the gradient g is used as a temperature width for determining the convergence of the temperature measurement.

  The value of α can be arbitrarily set, but in the present embodiment, this value is 0.00 ° C. (a value for determining that T (n) is not increased by comparing Tmax to the second decimal place of Tmax). ).

  The convergence determination time t0 is the count time of the time counter 24 for the stability detection determination unit 25 to determine the stability of the temperature detection, and the notification buzzer issuance timing when the time satisfying g ≦ 0.00 continues for t0 seconds. It is said. The value of t0 can be set arbitrarily, but in the present embodiment, this is 8 seconds.

  When g> 0.00 is satisfied, a reset signal is issued to the time counter 24, and the time counter 24 receiving the reset signal initializes the count. That is, it is determined that the gradient g has not yet become gentle, and the count of the time counter 24 is continuously reset, or once it has been detected that it has become gentle, but it is still unstable and is reset. . That is, the count of the time counter 24 is always reset unless g ≦ 0.00 continues for 8 seconds.

  The present embodiment is further characterized in that a deviation detection temperature width Δ1 is introduced to prevent the notification buzzer from being issued at an inappropriate timing. That is, the CPU 12 issues a notification buzzer when g ≦ 0.00 continues for 8 seconds in principle. However, if a deviation is detected by the parameter Δ1 during the counting of the time counter 24, the count of the time counter 24 is reset, and t0 1 is added, that is, the convergence determination time t0 is increased from 8 seconds to 9 seconds.

  Although the value of j in the deviation detection temperature range Δ1 can be arbitrarily set, in this embodiment, j = 8. Although the deviation detection determination value β can be set as appropriate, in this embodiment, β is set to 0.00, and it is determined that a deviation has occurred when Δ1 <β = 0.00.

  FIG. 4 is a flowchart for explaining the operation of the electronic thermometer 10.

  When the electronic thermometer 10 is powered on, the CPU 12 first resets the count of the time counter 24 (S402).

  Next, the temperature reading unit 20 reads the temperature measured by the temperature measuring unit 11 at each sampling timing (S404).

The temperature storage unit 21 stores the measured temperature at each sampling timing in a memory in the CPU (S406).

The gradient detector 23 of the CPU 12 calculates the gradient g and the deviation detection temperature width Δ1 (S408).
After detecting the gradient, the maximum measurement value storage unit 22 of the CPU 12 updates the maximum value Tmax when the measurement value at the latest sampling timing is the maximum value (S410).

  The time counter 24 determines whether or not the count is ON. If the count of the time counter 24 is OFF (NO in S412), the process proceeds to S414, and Tmax stored in the maximum measured value storage unit 22 is 32 ° C. or more. It is determined whether or not (S414). When Tmax stored in the maximum measured value storage unit 22 is 32 ° C. or more (YES in S414), the time counter 24 switches the count to ON (S418), and the display control unit (not shown) displays on the display unit 14. Is updated to Tmax stored in the maximum measured value storage unit 22 (S420).

  On the other hand, when Tmax stored in the maximum measured value storage unit 22 is less than 32 ° C. in S414 (NO in S414), the display control unit sets the display on the display unit 14 to “L” (S416) and returns to S404.

  If the count of the time counter 24 is ON in S412 (YES in S412), the process proceeds to S420, and the display control unit updates the display on the display unit 14 to Tmax stored in the maximum measured value storage unit 22.

  Next, the gradient detection unit 23 determines whether or not g ≦ 0.00 holds for the calculated gradient g (S422). If g ≦ 0.00 is not satisfied (NO in S422), the process returns to S402. If it is satisfied (YES in S422), it is determined that the gradient g of the measured temperature curve is gradually decreasing. move on. The gradient detection unit 23 monitors whether the peak value of the measured temperature increases or does not change within a certain range.

  Next, the gradient detection unit 23 determines whether Δ1 <0.00 is satisfied (S424). If Δ1 <0.00 is satisfied (YES in S424), it is determined that a deviation has occurred, t0 is increased by 1 second (S426), and the process returns to S402 to reset the count of the time counter 24.

  On the other hand, if Δ1 ≧ 0.00 is established in S424 (NO in S424), that is, if no deviation is detected, the process proceeds to S428, and the stability detection determination unit 25 of the CPU 12 reaches the count of the time counter 24 reaching t0. Judge whether or not.

  When the stability detection determination unit 25 determines that the count of the time counter 24 has finished counting 8 seconds as the convergence determination time t0 (YES in S428), the stability detection determination unit 25 notifies the buzzer control unit 26 of a buzzer issue signal. , And the buzzer control unit 26 receiving it sounds the buzzer 15 (S430). The notification buzzer is issued as described above.

  If the count is not completed in S428 (NO in S428), the time counter 24 is incremented (S432), the process returns to S404, the temperature measurement value is read again, and the operation from S404 is repeated.

  Here, if g> 0.00 is established during the counting by the time counter 24 (NO in S422), the process returns to S402, the count of the time counter 24 is reset, and the operation from the reading of the measured value in S404 is repeated. Become.

  Note that the electronic thermometer 10 can continue to measure the temperature even after the notification buzzer is issued, unless the measurer removes the thermometer from the armpit.

  Next, with reference to FIG. 5, the principle of detection of deviation and its operation in this embodiment will be described.

  FIG. 5 is an enlarged view of the vicinity of point B in FIG. 12, and the measured temperatures T (n) and T (n) at the sampling timings n, n−1, n−2, n−8, n−9, and n−10. n-1), T (n-2), T (n-8), T (n-9), and T (n-10) are illustrated. When the electronic thermometer 10 is deviated from the correct position of the axilla, the measurement curve is deviated from the gentle ascending curve measured without deviating from the correct position of the axilla. It is starting to descend.

The deviation detection temperature width Δ1 is shown again together with the deviation detection determination value. In this embodiment, since j = 8 is set, it is determined that a deviation has been detected when the following expression is established.
Δ1 = T (n) −T (n−8) <0.00
Here, from FIG. 5, after T (n−1) −T (n−9)> 0.00 at the sampling timing n−1, T (n) −T (n−8) at the sampling timing n. <0.00, and Δ1 <0.00 That is, Δ1 <β is established, and it is determined that the electronic thermometer 10 has shifted. In other words, the deviation detection temperature width Δ1 is determined to be that the position of the electronic thermometer 10 is shifted by detecting a region where the measured temperature curve that is rising is lowered due to the electronic thermometer 10 being shifted from an appropriate position of the axilla. I am doing so.

  When the deviation of the electronic thermometer 10 is detected based on the principle as described above, as described above, the CPU 12 adds 1 to the convergence determination time t0 to set it to 9 seconds, and resets the count of the time counter 24. By increasing the convergence determination time t0, the gradient g on the measured temperature curve is changed so as to converge in a more gentle region. By this change, the convergence condition becomes more severe, and the convergence timing is shifted later. Therefore, it is possible to prevent the notification buzzer from being generated, for example, in the vicinity of the point B in FIG. 12 until the measurement temperature curve is restored after the sampling timing n.

  As described above, according to the electronic thermometer 10 of the present embodiment, when the electronic thermometer 10 deviates from the correct position of the axilla, for example, when the measurer moves the body, that is, from the curve in which the measured temperature curve is normally predicted. Even in the case of deviation, the convergence judgment time for judging the timing of issuing the notification buzzer is increased from the standard value, that is, the timing of issuing the notification buzzer is protected so that a stable body temperature can be confirmed at the time of notification. Can do.

The increase value of the convergence determination time t0 is not limited to 1 second and can be arbitrarily set.
In addition, the degree of temperature decrease is determined by, for example, the difference T (n) −T (n−1) between T (n) and T (n−1), and the increase value of t0 is determined according to the difference. May be. In this way, it is possible to effectively prevent the notification buzzer from being issued at an inappropriate timing.

  In the above embodiment, both the increase of t0 and the reset of the count of the time counter 24 are performed, but only one of them may be performed. Furthermore, in order to prevent the timing at which the notification buzzer is issued from being significantly delayed, an upper limit may be set for the number of changes in t0.

  Further, after a certain time has elapsed after the start of measurement, the maximum measured value is considered to be close to the equilibrium temperature, so the shift detection function may be automatically turned off.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, when the electronic thermometer 10 is improperly applied to the axilla at the start of measurement, or when the state is maintained after being shifted from the correct position of the axilla after the measurement is started, This is to prevent the buzzer from issuing at an inappropriate timing.

  In the configuration related to the body temperature measurement of the second embodiment, Δ1 (deviation detection temperature range) calculated by the gradient detector 23 is replaced with a change rate Δ2 with respect to the configuration of FIG. 3 described in the first embodiment. It is a thing.

  FIG. 6 shows a measurement temperature curve when the electronic thermometer 10 is not properly applied to the axilla at the start of measurement by a solid line, and also shows a measurement temperature curve in an appropriate case, that is, a normal case by a dotted line. . As shown in the figure, if the application to the axilla is not appropriate, the heat of the body temperature is less likely to be transmitted from the skin surface of the axilla to the temperature sensor 11a of the electronic thermometer 10 as compared with the appropriate case. Becomes gentle. When the measurement is started and the state of the armpit is shifted and the state is maintained, the gradient becomes gentle from the middle of the dotted line in FIG.

  When such a situation occurs, a notification buzzer normally sounds at a point C on the dotted line, and the display unit 14 of the electronic thermometer 10 should display the measured temperature T1, but the same gradient as the point C. The notification buzzer is issued at the point D on the solid line having “”, and the display unit 14 displays the measured temperature T2.

  Then, the electronic thermometer 10 issues a notification buzzer at a sampling timing that is not yet sufficiently stable on the measurement temperature curve, thereby causing a problem of informing the measurer of inappropriate body temperature information.

Therefore, in the present embodiment, the rate of change Δ2 at a point when a certain time, for example, 50 seconds has elapsed from the start of measurement, is calculated, and this Δ2 is compared with the rate of change determination value γ. It is determined whether it is not smooth. That is, Δ2 = T (n) −T (n−i) <γ
Is established, the measured temperature curve is determined to be smoother than normally predicted, and a predetermined time is added to the convergence determination time t0 to converge in a region where the gradient g is smaller. I have to.

  Although i in Δ2 can be set arbitrarily, in this embodiment, i = 8. Further, γ and the addition time can be arbitrarily set, and can be set to 0.08 ° C. and 2 seconds, for example. The time until Δ2 is calculated after the start of measurement is not limited to 50 seconds, but can be arbitrarily set.

This is specifically illustrated in FIG. After 50 seconds from the start of measurement, the rate of change Δ2p at the point P is normal at the time indicated by the dotted line, whereas the rate of change Δ2q at the point Q is changed at the solid line where the above problem occurs. Since the solid line is a gentler curve than the dotted line, Δ2q <Δ2p.
In this embodiment,
Δ2 <0.08
When is established, the measured temperature curve is judged to be smoother than usual, 2 is added to t0, the timing of sounding the notification buzzer is delayed to a range where the gradient g is smaller, and the temperature displayed is the measured temperature. The temperature is more stable on the curve.

  Specifically, when not according to the present embodiment, the temperature T2 is notified at the point D at the time t2 in FIG. 6, but this is delayed to the point E at the time t3, and the temperature close to the normal notification temperature T1 is displayed. To do so.

  FIG. 8 is a flowchart for explaining the operation of the electronic thermometer 10.

  S802 to S806 in FIG. 8 are the same as S402 to S406 in FIG.

  In this embodiment, the gradient detection unit 23 of the CPU 12 calculates the gradient g in S808, and calculates Δ2 when 50 seconds have elapsed from the start of measurement. For the time measurement of 50 seconds, for example, although not shown, a timer may be built in the CPU 12 so that a calculation command signal is issued after the time measurement is completed.

  Subsequent S810 to S820 are the same as S410 to S420 in FIG.

  Next, the gradient detection unit 23 of the CPU 12 determines whether Δ2 <γ, that is, Δ2 <0.08 is satisfied (S822). This determination may be made only for 50 seconds after the start of measurement, or a large value, for example, infinity is substituted for Δ2 in advance, and NO is returned to S822 until Δ2 is calculated. Also good.

  If Δ2 <0.08 is established in S822 (YES in S822), it is determined that the gradient is gentler than usual, so that 2 is added to the convergence determination time t0 and extended (S824). The process proceeds to S826. If not established, the gradient is considered to be within the normal range (NO in 822), and the process directly proceeds to S826.

  In S826, the gradient detector 23 determines whether or not g ≦ α, that is, g ≦ 0.00, and determines the convergence state. The next steps S828 through S832 are the same as S428 through S432 in FIG.

  As described above, in the present embodiment, the gradient is determined based on the rate of change of the measured temperature curve after a certain time has elapsed from the start of measurement. If it is determined that the measurement is smoother, the convergence determination time t0 is extended to be converged in a region where the gradient g is smaller, and measurement is performed at an unstable sampling timing on the measurement temperature curve when the notification buzzer is issued. The temperature is prevented from being reported.

  In the present embodiment, the convergence determination time t0 is extended based on the rate of change of the measured temperature curve after a lapse of a certain time from the start of measurement, but this may be shortened. For example, when the measurement environment temperature is high, the temperature difference between the body temperature and the electronic thermometer is small, so the rise of the measurement temperature curve is accelerated, so this is determined from the rate of change of the measurement temperature curve after a certain time has elapsed since the start of measurement On the other hand, it is conceivable to shorten the convergence determination time t0 and sound the notification buzzer early. An example thereof will be described below as a third embodiment.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, it is assumed that the measured temperature curve of the electronic thermometer 10 deviates from a normal curve due to the difference between the body temperature and the environmental temperature, and when the deviation is predicted in advance, the value of the convergence determination time t0. Increase or decrease.

  FIG. 9 shows a measured temperature curve when such a condition occurs.

  For example, when the environmental temperature is low such as in winter, the temperature of the skin of the axilla is also low due to the low environmental temperature, so that the heat at the center of the body is not easily transmitted to the temperature sensor 11a through the skin surface of the axilla. As shown in the measured temperature curve C3 in the figure, the gradient is gentle with respect to the normal measured temperature curve C2. In such a case, a problem similar to the problem described in the second embodiment described above occurs, so that t0 is increased and the display of the temperature T3 at point I at time t4 is delayed to point J at time t5. A temperature close to T2 is displayed.

  On the other hand, when the environmental temperature is high, such as in summer, the temperature of the skin of the axilla is high, so that the heat at the center of the body is easily transmitted to the temperature sensor 11a through the skin surface of the axilla, and thus the measured temperature curve C1 in FIG. As shown, the slope becomes steep with respect to the curve C2. In such a case, since the temperature converges to the equilibrium temperature earlier in time, the temperature reaches a stable temperature more quickly, so that a notification buzzer can be issued early. In other words, in FIG. 9, when T1 is notified at point G at time t2 unless the value of convergence determination time t0 is changed, t0 is decreased and notification buzzer is displayed at point F at time t1 (having a larger gradient than point G). The temperature close to T2 can still be displayed even if is issued.

  Therefore, in such a case, the convergence determination time t0 can be decreased to cause the notification buzzer to be issued earlier, and it can be made easier for the measurer to use.

Next, a specific configuration and operation of the present embodiment will be described.
First, the configuration related to body temperature measurement of the third embodiment is the same as the configuration of FIG. 3 described in the first embodiment, except that the temperature reading unit 20 reads the measurement value read from the temperature measurement unit 11 at the start of measurement. While outputting to the stability detection determination part 25 as an environmental temperature measurement value, the stability detection determination part 25 increases / decreases the convergence determination time t0 with an environmental temperature measurement value.

  Next, in the present embodiment, an increase / decrease value of the convergence determination time t0 with respect to the environmental temperature is determined in advance through experiments or the like, and stored in a memory in the CPU 12 or the like.

  FIG. 10 is a table showing an example thereof. As shown in FIG. 10, in this embodiment, when the environmental temperature is 15 ° C. or higher and lower than 35 ° C., the increase / decrease of t0 is 0, and when it is lower than 15 ° C., it is increased by 2 seconds and is increased by 35 ° C. or higher. However, these conditions can be set arbitrarily.

  FIG. 11 is a flowchart for explaining the operation of the electronic thermometer 10.

  Then, as shown in FIG. 11, the CPU 12 measures the measurement value measured by the temperature sensor 11a at the start of measurement as the environmental temperature (S102), and obtains an increase / decrease value of t0 with reference to the table of FIG. The convergence determination time is reset to t0 + increase / decrease value (S104). This operation can be performed, for example, within a self-check operation following power-on. Since the flow after S106 is the same as that described in the first and second embodiments, the description thereof will be omitted.

As described above, according to the electronic thermometer 10 of the present embodiment, even when the measured temperature curve deviates from the normal curve due to the temperature difference between the body temperature and the environmental temperature, the convergence determination time t0 when the temperature difference is large. To prevent the temperature at an unstable sampling timing on the measured temperature curve from being displayed when the notification buzzer is issued, and if the temperature difference is small, t0 is decreased and the notification buzzer is turned off. The timing of issuing can be advanced, making it easy for the measurer to use.

  In the above description, the first to third embodiments have been described individually, but these can be combined as appropriate to constitute the electronic thermometer of the present invention.

  For example, if the second embodiment and the third embodiment are combined, and the increase / decrease value of the convergence determination time t0 determined from the gradient g after the elapse of a certain time after the start of measurement is changed according to the measurement environment temperature, The display temperature when issuing the notification buzzer can be made more appropriate.

DESCRIPTION OF SYMBOLS 10 Electronic thermometer 11 Temperature measurement part 11a Temperature sensor 11b A / D converter 12 CPU
14 Display unit 15 Buzzer 16 Switch 19 Main body 20 Temperature reading unit 21 Temperature storage unit
22 Maximum measurement value storage unit 23 Gradient detection unit 24 Time counter 25 Stability detection determination unit 26 Buzzer control unit

Claims (5)

Temperature measuring means for measuring the temperature;
Storage means for storing the temperature measured by the temperature measurement means for each sampling timing;
A gradient detecting means for calculating a gradient of the measured temperature at each sampling timing based on the measured temperature stored in the storage means;
When the slope calculated by the slope detection means keeps a time that is equal to or less than a predetermined first predetermined value, and when the time measured by the time measuring means continues for a predetermined time or more. , Stability detection judgment means for generating a notification signal;
In an electronic thermometer having
The gradient detection means calculates a temperature width obtained by subtracting a measurement temperature at a sampling timing preceding by a predetermined first sampling number from a measurement temperature at a current sampling timing, and the temperature width is the first predetermined value. The electronic thermometer characterized in that the stability detection determining means increases the predetermined time of the time keeping time when the value is smaller than a predetermined second predetermined value which is equal to or less than the value . The timekeeping means further comprises an initialization function for returning the timekeeping time to an initial state,
2. The electronic thermometer according to claim 1 , wherein when the temperature width is smaller than the second predetermined value, the time measuring time of the time measuring means is further initialized. Temperature measuring means for measuring the temperature;
Storage means for storing the temperature measured by the temperature measurement means for each sampling timing;
A gradient detecting means for calculating a gradient of the measured temperature at each sampling timing based on the measured temperature stored in the storage means;
When the slope calculated by the slope detection means keeps a time that is equal to or less than a predetermined first predetermined value, and when the time measured by the time measuring means continues for a predetermined time or more. , Stability detection judgment means for generating a notification signal;
In an electronic thermometer having
Based on the rate of change obtained by subtracting the measured temperature at the sampling timing previous by the predetermined second sampling number from the measured temperature at the current sampling timing calculated after the lapse of a predetermined time after the start of measurement, An electronic thermometer characterized by increasing or decreasing the predetermined time . A table that predetermines the relationship between the environmental temperature at the start of measurement and the increase / decrease value of the predetermined time;
4. The electronic thermometer according to claim 3 , wherein the stability detection determining means refers to the table at the start of measurement, and increases or decreases the predetermined time according to the environmental temperature measured by the temperature measuring means. The gradient is the measured temperature at the current sampling timing, any one of claims 1 and calculates 4 as a difference obtained by subtracting the maximum measured temperature of the measuring temperature sampled by the current sampling timing 1 Electronic thermometer according to item.

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