JPS6362688B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION A. Technical Field The present invention relates to an electronic thermometer, and more specifically to a so-called predictive electronic thermometer that predicts and displays the temperature in a thermal equilibrium state during body temperature measurement.

B. Prior art and its problems Conventionally, such electronic thermometers predict the temperature at thermal equilibrium from the measured temperature and display this in advance before reaching the thermal equilibrium state. This temperature prediction is typically performed by monitoring the measured temperature and its rate of change over time, and using a prediction function that uses these two variables and the elapsed time up to the time of monitoring as variables. Therefore, the predicted equilibrium temperature is uniquely determined by the measured values of these three variables.

Electronic thermometers using this type of equilibrium temperature prediction method complete temperature measurement before reaching a thermal equilibrium state, so they have the advantage of short temperature measurement times. has the disadvantage that prediction accuracy is significantly reduced.

This temperature prediction function usually includes the body temperature measured at the site of measurement,
For example, the shape of the temperature rise curve differs depending on whether it is in the armpit or in the mouth.

The measurements, or predictions of the thermal equilibrium temperature, are made repeatedly at a series of discrete points in time. The measurement ends when the predicted value of the thermal equilibrium temperature falls within a predetermined rate of change, in other words, when the difference between the previous predicted value and the current predicted value falls within the predetermined range. be done. When it is determined that the measurement is completed in this way, the prediction calculation operation is stopped and the predicted thermal equilibrium temperature is displayed. This display generally remains until the electronic thermometer is powered off.

Generally, with a direct reading thermometer such as a mercury thermometer, the longer the temperature measurement time, the closer the temperature can be measured to the thermal equilibrium temperature, so the measurement accuracy improves depending on the temperature measurement time. Therefore, in the above-mentioned predictive electronic thermometer, the display of the predicted value is maintained after the measurement is completed, so even if the temperature measurement time is extended, a predicted value with higher accuracy will not be displayed. In other words,
It simply displays the predicted equilibrium temperature with the accuracy inherent to the electronic thermometer.

When an electronic thermometer is manufactured, shipped, or used in a medical institution such as a hospital, a test may be performed to calibrate or confirm the absolute accuracy of the electronic thermometer. However, in the case of a predictive electronic thermometer, if a normal constant temperature bath is used, a predicted value different from the constant temperature will be displayed, which is inconvenient. To avoid this, even predictive electronic thermometers can be designed to switch to direct-indication operation mode under special temperature conditions, and tests can be performed under such special temperature conditions.
Electronic thermometers must be equipped with a mode selector switch that can select between predictive and direct-indication operating modes.

As mentioned before, the shape of the temperature rise curve for performing predictive calculations differs depending on the part to be measured, such as underarm temperature measurement or oral temperature measurement. Since a predictive electronic thermometer retains its predicted equilibrium temperature value upon completion of measurement, for example, even if an electronic thermometer for oral measurement is used for underarm measurement, the correct predicted value will not be displayed. Conversely, the same applies when an electronic thermometer for armpit measurement is used for oral measurement.

Purpose of the Invention The present invention eliminates the drawbacks of the prior art and provides an electronic thermometer that meets the purpose of temperature measurement, that is, is capable of predictive calculation of thermal equilibrium temperature with accuracy according to the user's will. The purpose is to

The electronic thermometer according to the present invention includes a temperature detecting means for detecting the temperature of a part to be measured and generating a first signal indicating this temperature, an accumulating means for sequentially accumulating the first signal, and an elapsed time after the start of measurement. an elapsed time clock circuit that measures the elapsed time and generates a second signal indicating the elapsed time; and an elapsed time clock circuit that reads the first signal corresponding to the latest past period of a predetermined length from the storage means and calculates the average value for the period. a first arithmetic circuit that calculates a third signal indicating the maximum value of the calculated average values, and a second calculation circuit that calculates a predicted value of the equilibrium temperature from the second and third signals using an equilibrium temperature prediction function 2 arithmetic circuits, a first control circuit that causes the first and second arithmetic circuits to perform arithmetic operations at a predetermined cycle, and display means for displaying a predicted value of the equilibrium temperature, and the equilibrium temperature prediction function is as follows: An electronic thermometer in which the predicted value of the equilibrium temperature increases as the elapsed time increases and takes a predetermined value when the elapsed time is a predetermined length or more,
a second control circuit responsive to the elapsed time clock circuit to compare a third signal corresponding to two successive points in time; is exceeded, and after the difference between the third signals corresponding to the two time points no longer shows an increase exceeding the first predetermined range, the third signal corresponding to the current time point is the third corresponding to the point in time
The electronic thermometer further stops the operation of the first and second arithmetic circuits when the electronic thermometer shows a decrease exceeding a second predetermined range compared to the signal of It includes a holding circuit that holds the predicted value of the equilibrium temperature when the system is stopped.

The holding circuit causes the display means to display a predicted value of the equilibrium temperature when the operations of the first and second arithmetic circuits are stopped.

The second control circuit controls a third control circuit corresponding to the two points in time.
The third signal corresponding to the current point in time is within the second predetermined range compared to the third signal corresponding to the previous point in time before the difference in the signals of . When a decrease exceeding the range is indicated, a first display indicating this condition is displayed on the display means.

The second control circuit causes the display means to display a second display indicating this state when the predicted value output from the second arithmetic circuit exceeds a third predetermined range.

The second control circuit displays the first display on the display means and stops the first and second arithmetic circuits.

The second control circuit displays the second display on the display means and stops the first and second arithmetic circuits.

The display means includes a liquid crystal display element that visually displays the predicted value, and an illumination means that illuminates the liquid crystal display element, and the second control circuit is configured to control the operation of the first and second arithmetic circuits prior to stopping the operation of the first and second arithmetic circuits. to turn on the lighting means for a predetermined period.

The second control circuit controls the first and second arithmetic circuits when the second signal exceeds a second predetermined elapsed time that is longer than both the predetermined length and the first predetermined elapsed time. stop the operation.

The holding circuit holds the data until measurement is started again.

DETAILED DESCRIPTION AND OPERATIONS OF THE INVENTION Examples of the electronic thermometer according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the basic configuration of an electronic thermometer according to the present invention. Its main components are a temperature detection section 1 that includes a temperature sensing element, a measurement circuit 2 that converts its electrical output into temperature data, an arithmetic circuit section 3 that computes the temperature data and calculates the equilibrium temperature, and a display that displays the results of the arithmetic processing. 4 and a control section 5 that controls the arithmetic circuit section. A display holding section 11 is connected to the display section 4 to hold display contents to be displayed thereon.

As shown in the figure, the arithmetic circuit section 3 performs arithmetic operations in response to instructions from the control signal 103 from the control section 5, and connects the data reading section 6, memory 7, elapsed time measurement section 8, prediction calculation section 9, and measurement It has subunits such as a termination determination section 10.

The data reading section 6 is a circuit that reads the temperature data output from the measurement circuit 2 and stores it in the memory 7. The elapsed time measuring section 8 is a circuit that receives the clock signal 106 from the control section 5 and measures the elapsed time since the operation of the arithmetic circuit section 3. The control unit 5 measures the elapsed time using the arithmetic circuit unit 3.
Since a control signal 103 is outputted to cause each part of the system to perform each process at regular intervals, this may of course be used.

The prediction calculation unit 9 is a central part of the calculation circuit unit 3, and is a circuit that calculates a predicted value of the thermal equilibrium temperature according to a temperature prediction function in accordance with the temperature detected by the temperature detection unit 1. The measurement end determination unit 10 is a part having one important feature of the present invention, and is a circuit that determines the conditions for terminating the prediction calculation in the prediction calculation unit 9. Both of these circuits will be explained in detail later.

The operation will be explained with reference to the flow diagram in FIG.
When a detection unit 1 including a temperature sensing element such as a thermistor whose electrical characteristics change depending on temperature is applied to a body temperature measurement site in the mouth or under the armpit, its electrical output 101 changes. The measurement circuit 2 receives the electrical output 101, converts it into temperature data, and outputs the temperature data 102.
The data is sent to the data reading section 6 of the arithmetic circuit section 3 as a. If the arithmetic circuit section 3 is in an operating state at this stage, each step in FIG. become.

The conditions for starting the operation of the arithmetic circuit section 3 may be arbitrary. For example, it may be possible to simply turn on a power switch (not shown), or it may be designed to automatically start operating when the temperature detected by temperature detection section 1 shows a change of more than a certain value. You can leave it on.

Now, the data reading section 6 has a temperature data output 102.
In response to this, the temperature data is taken in, new temperature data is stored in the memory 7 by the data write signal 105, and the data read storage step 202 is completed. An elapsed time measuring section 8 inside the arithmetic circuit section 3 measures the elapsed time in response to a clock signal 106 from the control section 5. Thus, elapsed time measurement step 20
3 is performed every predetermined period of the clock signal 106.

In this embodiment, the prediction calculation section 9 takes in the latest temperature data stored in the memory 7 and the elapsed time measured by the elapsed time measurement section 8 as the latest temperature data signal 107 and elapsed time signal 108, respectively.
Using these, perform the prediction calculation step 204,
For example, a calculation is performed to predict the equilibrium temperature that is expected to reach equilibrium after about 3 to 10 minutes.

Various methods have been proposed and implemented in the past for predictive calculation, but the present invention has a major feature based on its structure and relationship with the measurement end determination section 10, which will be described later. That is, to put it simply, the origin of the feature lies in the fact that predictive calculations are performed and displayed at every measurement cycle until it is determined that the measurement has ended.

Generally, when measuring body temperature, the time it takes to reach equilibrium temperature is approximately 3 minutes for oral temperature measurement;
It is said that armpit temperature measurement takes about 5 to 10 minutes, but the temperature detected by the detection unit 1 approaches the equilibrium temperature as the measurement time passes. Regarding the temperature predicted during the measurement, the equilibrium temperature is usually predicted based on the temperature detected by the detection unit 1, so the predictive calculation algorithm is used so that the temperature approaches the equilibrium temperature on average over time. is set. for example,
In the middle of the measurement, it is determined at what point the equilibrium temperature will be reached based on the relationship between the elapsed time and the measured temperature, and when calculating the prediction, the temperature added to the measured temperature is decreased by a smooth change over time and the temperature is reached at that point. You may calculate it so that it becomes 0. It is easier to fix the calculation method by, for example, decreasing the temperature to be added smoothly from the beginning and setting it to 0 after 10 minutes, for example, and the result will not be so bad. If this is done, the accuracy of the prediction calculation result will increase over time, and eventually, after a certain period of time, the measured temperature itself will become the calculation result, and will come to match the equilibrium temperature.

There are still several other ways to improve predictive calculations. Normally, the predicted calculated value of the equilibrium temperature when 30 to 40 seconds have passed for mouth temperature measurement and 45 to 60 seconds for armpit temperature measurement after the start of measurement has a deviation of about ±0.2℃ from the equilibrium temperature. . However, for example, even with oral temperature measurement, the deviation from the equilibrium temperature is ±0.5°C after about 15 seconds have passed.
There is a tendency for the results of predictive calculations to be extremely useful. Therefore, for example, in oral temperature measurement, the predicted calculation result is not displayed until the elapsed time exceeds 30 seconds, or a somewhat lower temperature is displayed, and as time passes, the closer the predicted calculation value of the equilibrium temperature is, the Consideration should be given to impressing the user with natural temperature changes.

In addition, when the temperature detected by the temperature detection unit 1 is changing at a large rate of change, it generally takes some time to reach the equilibrium temperature, and when it is not, it is close to the equilibrium temperature, so even with the same temperature measurement method, Prediction calculations are performed taking into account the fact that the changes in the detected temperature vary depending on the measurement conditions.
For example, in armpit temperature measurement, there is a difference of about 5 to 10 minutes in the time it takes to reach equilibrium temperature when the armpit is closed and when it is opened. Therefore, the point in time when the temperature shows a constant rate of change is 1.
As a guideline, it is possible to take measures such as terminating the prediction calculation at that point or notifying the end. In the embodiment of the present invention, the predictive calculation continues even after this constant rate of temperature change has been reached, and the calculation results are newly changed at each measurement cycle until the end of the measurement. It is. However, as will be described later, the point showing this constant rate of temperature change will be used to determine the end of the measurement.

In any case, the prediction calculation section 9 thus performs the prediction calculation step 204, sends the display output 104 to the display section 4, and causes the display step 205 to be performed. On the other hand, the measurement completion determination section 10, which represents one feature of the present invention, outputs the latest temperature data 109 from the memory 7 and the elapsed time measurement section 8 at regular intervals.
The elapsed time signal 110 is taken in from , and the end of the measurement is constantly monitored.

The conditions for determining the end of measurement are (1) the above-mentioned elapsed time exceeds a predetermined value, (2) the change in temperature falls below a certain value, and (3) the detected temperature reaches a predetermined value. A decrease of more than the value is used. The first of the three conditions included here is essential in the sense that the results of the prediction calculation are reliable.
If only the second condition is to be determined, the first condition should be changed to avoid the result of the predictive calculation being displayed clearly even in the event of failure. Consider.

The second condition has the purpose of taking advantage of the rationality of the measurement, since a temperature measurement with good responsiveness will have high reliability even if the result is notified quickly. Therefore, some effect can be obtained by omitting the second condition and lengthening the first condition, which is the elapsed time constraint. Also, as mentioned earlier, the original purpose of the second condition is to make predictions with approximately the same accuracy at different speeds depending on whether the temperature reaches equilibrium quickly or when it does not. Therefore, in the prediction calculation, it is also possible to capture (4) the time when the magnitude of the temperature to be added to the measured temperature becomes less than a certain value and change this to the second condition.

The most important determination condition when the measurement end determination section 10 in this apparatus implements the measurement end determination step 206 is the third condition. After the first and second conditions are met, the predicted calculated value of the equilibrium temperature displayed on the display unit 4 is highly reliable, and for normal purposes it is not practical even if the temperature measurement ends at this point. There is no problem. There are naturally various ways to end the temperature measurement, but since it involves the action of removing the detection unit 1 from the measurement site, it is probably most reasonable to determine that the temperature measurement has ended with this action. Seems to be the target. Specifically, it is more advantageous than using a mechanical switch to provide a touch sensor near the detection unit 1 to detect when the detection unit 1 is separated from the human body, and use the signal to determine the end of the measurement.

In the present invention, the measurement end determination unit 10 is configured to determine the end of temperature measurement by utilizing the phenomenon that the detected temperature decreases when the temperature detection unit 1 leaves the measurement site under normal environmental conditions for measuring body temperature. are doing. Specifically, after the first and second conditions are satisfied, the temperature detected by the detection unit 1 becomes
When the temperature drops by 0.1° C. or more, the measurement end determination unit 10 outputs a measurement end signal 111. Measurement end signal 11
1 is output, a part of it is sent to the display holding unit 11 as the operation instruction signal 112 of the display holding unit 11.
is input. The display holding unit 11 sends a display holding signal 113 to the display unit 4, performs a display holding step 207, and holds the display content currently being displayed. At the same time, the measurement end signal 111 executes the arithmetic circuit section stop step 208, and at least the arithmetic circuit section 3
stop the operation. In this way, the arithmetic circuit section 3 stops at the end step 209.

Now, if the end of the measurement is not determined in the measurement end determination step 206, the loop 2 for continuing the measurement is
Enter 10. That is, even if the first and second conditions are satisfied among the three judgment conditions in the measurement end judgment step 206, if the third condition is not satisfied, the loop 210 is cycled. The third condition is almost only satisfied artificially when measuring body temperature, so as mentioned in the prediction calculation section, the accuracy of the prediction calculation will decrease over time unless the person taking the measurement tries to stop measuring. The results will be displayed on the display unit 4. Therefore, when the first and second conditions are met, this is notified to the person taking the measurement using a buzzer, etc., and for normal temperature measurement purposes, the person taking the temperature measurement is encouraged to finish the measurement at that point. It is sufficient to leave it there. If even more precise measurement is required, the measurement can be continued at the discretion of the measurer. Then, over time, a highly reliable predicted value of equilibrium temperature can be obtained. After a certain period of time has elapsed, the results will be displayed that completely match the equilibrium temperature.

In this way, the present invention provides a predictive electronic thermometer that predicts accuracy improves with elapsed time and that it is possible to obtain a measurement value as close to the equilibrium temperature as possible according to the will of the user. It has characteristics.

The effects of the present invention are tremendous, and are particularly effective in the following two points.

One of them is that the equilibrium temperature can be accurately measured even when using another thermometry method. Commonly used temperature measurement methods include oral, armpit, and rectal temperature measurement.Due to the historical background of temperature measurement customs, oral temperature measurement is practiced in countries that follow the British tradition, and armpit temperature measurement is practiced in countries that follow the German tradition. It is said that Rectal temperature measurements are also commonly used in newborns and patients under anesthesia. Regarding oral temperature measurement and armpit temperature measurement, most people follow one or the other method of temperature measurement, but there are technical issues as to whether or not they should be treated separately when calculating equilibrium temperature. There are some aspects that require consideration. In other words, the two temperature measurement methods are significantly different in how the temperature changes from the start of measurement to equilibrium, and as a result, it is difficult to ideally perform both temperature measurement methods with a single predictive thermometer. , which is somewhat unreasonable under the current circumstances. Rather, in practice, a prediction of the optimal equilibrium temperature is often set for each temperature measurement method. As mentioned above, a dedicated predictive electronic thermometer that uses one of the temperature measurement methods usually suffices, but sometimes it becomes necessary to use another temperature measurement method. In terms of prediction technology, rectal temperature measurement is similar to oral temperature measurement, but in Japan, for example, there are situations where it is necessary to use an armpit temperature measurement instead of a rectal temperature measurement or an oral temperature measurement. In this case, according to the embodiment of the present invention, even if measurement is performed using another temperature measurement method, the equilibrium temperature can be accurately measured after a predetermined period of time has elapsed, so that the objective can be achieved.

Another issue is temperature calibration and verification. With predictive electronic thermometers, the displayed value is the predicted value of the thermal equilibrium temperature, which is the result of predictive calculation, so usually
It is not possible to know what the true temperature, ie, the actual temperature of the part to be measured, is. For this reason, when calibrating or verifying the temperature in conventional predictive electronic thermometers, some methods are used, such as switching to a mode that displays the detected temperature as is, or switching to a direct display mode when specific temperature conditions are given. Requires cumbersome procedures and treatments. It goes without saying that these problems can also be overcome according to the present invention.

3 and 4 show another embodiment of the invention. The difference from the embodiments shown in FIGS. 1 and 2 is that in addition to the above-mentioned subunits, the arithmetic circuit section 3 also includes a moving average temperature calculation section 12, a maximum moving average temperature calculation section 13, and an error determination section 15. , a prediction end determination section 14 and a range over determination section 16 are added, and a buzzer 17 and a lamp 18 are connected to the arithmetic circuit section 3.

The moving average temperature calculation unit 12 is a circuit that calculates the average value of several latest series of temperature data measured at each measurement cycle. This moving average temperature is used to reduce the influence of slight fluctuations in temperature data on the results at later processing stages such as prediction calculations. For example, for temperature data every second, the average value is about 5 to 15. is used. The maximum moving average temperature calculation section 13 takes in the moving average temperature signal 115 obtained by the moving average temperature calculation section 12 and output every cycle, and if it is larger than the previous value, calculates it, and if it is smaller, discards it. It is a circuit. The maximum moving average temperature determined here is used in the later main calculation process.

As briefly explained in connection with the previous embodiment, the prediction end determination unit 14 determines that when the elapsed time exceeds a certain value,
It is also a circuit that determines when the change in temperature falls below a certain value. The error determination unit 15 detects the latest temperature data signal 119 from the memory 7 and the maximum moving average temperature calculation unit 13 before these two conditions are satisfied.
and the maximum moving average temperature signal 118 from
This circuit determines an error if the latest temperature is lower than the maximum moving average temperature by a predetermined value, for example, 0.1°C or more. The specific meaning of an error condition is when a measurement is interrupted before the predictive calculation results are guaranteed with sufficient accuracy, or when the thermometer is removed from the measurement site. This is to prevent the temperature from being displayed in some cases.

The range over determination unit 16 is a circuit that monitors the predictive calculation result of the predictive calculation unit 9 and determines whether the predicted value is within a predetermined temperature range, for example, 30° C. or lower or 43° C. or higher.

The lamp 18 is provided near the display section 4 using, for example, a liquid crystal display element, and is used to illuminate the display section 4. The buzzer 17 is an audible signal generating device that notifies the user of the completion of prediction.

By the way, to explain the operation with reference to the flowchart in FIG. 4, the temperature data 114 from the memory 7 is taken into the moving average temperature calculation section 12, and here several latest series of temperature data measured for each cycle are calculated. An average value of the temperature data is calculated in a moving average calculation step 211. In the maximum moving average temperature calculation unit 13,
A maximum value calculation step 212 is executed in which the moving average temperature signal 115 output from the moving average calculation unit 12 for each cycle is taken in, and if it is larger than the previous value, it is determined, and if it is smaller, it is discarded.

The prediction end determination unit 14 determines when the elapsed time exceeds a predetermined value and the change in temperature becomes less than or equal to a predetermined value. The error determination unit 15 detects the latest temperature data signal 119 before these two conditions are satisfied.
is lower than the maximum moving average temperature signal 118 by a predetermined value, for example, 0.1° C. or more, an error is determined.
This is the error determination step 213.

In this way, the error determination section 15 outputs the error determination signal 1.
When 25 is output, part of it becomes a signal 112 to the display holding unit 11 and a signal for displaying, for example, E (alphabet E, meaning error). In this case, after E is displayed on the display section 4 in the display step 217, the display holding section 11 is operated as it is to carry out the display holding step 207 in which the display of E is held. Another part of the signals causes the arithmetic circuit stop step 208 to stop the arithmetic circuit unit 3. This error determination step 213 is executed every cycle until the previous prediction end determination condition is satisfied, and then skipped.

Next, when a "NO" determination is made in the error determination step 213, in the case of this embodiment, the prediction calculation unit 9 calculates the maximum moving average temperature signal 116 and the elapsed time signal 108 output by the elapsed time measurement unit 8. make use of,
In a prediction calculation step 204, a prediction calculation of the equilibrium temperature is performed. The result is monitored in the range over judgment step 214 performed by the range over judgment section 16 for the predicted value output 120, and when the predicted value exceeds a predetermined temperature range, for example, the predicted value is 30 degrees Celsius or less or 43 degrees Celsius.
In the above cases, a determination of "YES" is made. At this time, the range over determination section 16 outputs a range over signal 126, a part of which is output to the display step 21.
At step 8, the display unit 4 displays, for example, O (alphabet O meaning over), and the same operation as that carried out by the error determination unit 15 is performed thereafter.
When the range over determination unit 16 makes a “NO” determination, the predicted value display output 1 from the prediction calculation unit 9
04, the display unit 4 executes the display step 205.

The prediction end determination unit 14 performs a prediction end determination step 215
elapsed time signal 121 and maximum moving average temperature 117
each for a predetermined period of time (e.g. 30 seconds)
When the temperature exceeds the specified temperature and shows a specified change (for example, a change within 0.2°C/sec), it is judged as "YES",
A signal 123 for making the buzzer 17 sound is output, and a buzzer sounding step 219 is executed. At this time, the prediction end determination section 14 outputs the prediction end signal 127, and the error determination section 15 and the range over determination section 1
Similarly to 6, it is also possible to maintain the display and stop the arithmetic circuit unit 3.

Regarding the prediction end determination, once a "YES" determination is made, the next prediction end determination is skipped. Next, the elapsed time measurement unit 8 measures the elapsed time since the arithmetic circuit unit 3 started operating in the elapsed time measurement step 203, and also measures the elapsed time in the time end determination step 216.
When the predetermined normal body temperature measurement is surely completed, for example, 15 minutes, the time end signal 128 is automatically output, the display is maintained, and the arithmetic circuit section 3 is stopped. Do the following. The function performed by the measurement end determination section 10 is to detect the maximum moving average temperature signal 122 in the measurement end determination step 215.
and the latest temperature signal 109, and after the prediction end determination unit 215 once determines the end of the prediction, the latest temperature is determined to be a predetermined value lower than the maximum moving average temperature, e.g.
If the temperature is lower than 0.1℃, determine this and immediately
Alternatively, after a predetermined time (for example, 5 or 6 seconds), output a signal 124 that lights up the lamp 18 for a predetermined time (for example, about 2 to 4 seconds), execute the lamp lighting step 220, and send the measurement end signal 111. This is to maintain the display and stop the arithmetic circuit section 3. Of course, the lamp 18 is turned on so that the display can be read even in a dark place. The loop 210 for continuous measurement is repeated until the end of the measurement is determined in the measurement end determination step 206.

As described above, in the embodiment shown in FIG. 3, the moving average temperature calculation section 12 is added to the embodiment shown in FIG. Judgment, measurement completed,
We have made the prediction end judgment more effective, added the function of range over judgment, and improved each judgment process: error judgment, (prediction end judgment), range over judgment, measurement end judgment, and time end judgment. The determination on the "YHS" side also includes a function of stopping the arithmetic circuit section 3 while the display on the display section 4 is held by the display holding section 11. Regardless of which result is retained in the display, the displayed result is important to the measurer and must be retained at least until the measurer reads the result. Glass thermometers retain their results unless you shake them down. In the case of an electronic thermometer as well, it is extremely meaningful to maintain the display until the next measurement is started, as in this embodiment. Furthermore, stopping the operation of the arithmetic circuit section 3 after all the determination steps is important in the sense of suppressing excess power consumption as much as possible.

It goes without saying that all the functions in the arithmetic circuit section 3 can be realized by, for example, a single-chip microcomputer.

Specific Effects of the Invention By having the electronic thermometer according to the present invention configured as described above, it is possible to display the predicted value of the thermal equilibrium temperature with accuracy according to the user's will. That is, the longer the measurement time is, the more the prediction accuracy can be improved compared to the normal accuracy.
As a measuring instrument, it is possible to calibrate and confirm temperature display without special conditions or mode switching. Furthermore, by taking a longer measurement time, it is possible to accurately measure the temperature by using other temperature measurement methods instead of relying on the temperature measurement method specific to the thermometer. Also,
The measurement can be ended at any time, and the display of the measurement result can be maintained until the next measurement, for example, without wasting power.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the electronic thermometer according to the present invention, FIG. 2 is a flow diagram showing the operation of the electronic thermometer shown in FIG. 1, and FIG. 3 is a block diagram showing another embodiment of the electronic thermometer according to the present invention. FIG. 4 is a flow diagram showing the operation of the electronic thermometer shown in FIG. 3. Explanation of symbols of main parts, 1...Temperature detection section, 3
... Arithmetic circuit section, 4 ... Display section, 5 ... Control section, 7 ... Memory, 8 ... Elapsed time measurement section,
9...Prediction calculation unit, 10...Measurement end determination unit, 1
1...Display holding unit, 12...Moving average temperature calculation unit, 13...Maximum moving average temperature calculation unit, 14...
Prediction end determination unit, 15...Error determination unit, 16...
...Range over judgment section.

Claims (1)

[Scope of Claims] 1. Temperature detection means for detecting the temperature of the part to be measured and generating a first signal indicative of the temperature; Accumulating means for sequentially accumulating the first signal; and Time elapsed after the start of measurement. an elapsed time clock circuit that measures the elapsed time and generates a second signal indicative of the elapsed time; and reads a first signal corresponding to the most recent past period of a predetermined length from the storage means and calculates the average over the period. a first arithmetic circuit that calculates a value and forms a third signal indicating the maximum value of the calculated average values; and a predicted value of the equilibrium temperature is calculated from the second and third signals by an equilibrium temperature prediction function. a second arithmetic circuit; a first control circuit that causes the first and second arithmetic circuits to perform arithmetic operations at a predetermined cycle; and display means for displaying a predicted value of the equilibrium temperature, the equilibrium temperature prediction The function is an electronic thermometer in which the predicted value of the equilibrium temperature increases as the elapsed time increases and takes a predetermined value when the elapsed time is equal to or greater than a predetermined length, and the electronic thermometer responds to the elapsed time clock circuit. and a second control circuit that compares a third signal corresponding to two successive points in time, the second control circuit indicating that the second signal has exceeded the first predetermined elapsed time. , and after the difference between the third signals corresponding to the two points in time no longer shows an increase beyond the first predetermined range, the third signal corresponding to the current point in time is equal to the third signal corresponding to the previous point in time. When the electronic thermometer shows a decrease exceeding a second predetermined range compared to the signal of No. 3, the electronic thermometer stops the operation of the first and second arithmetic circuits; An electronic thermometer characterized in that it includes a holding circuit that holds a predicted value of equilibrium temperature when operation is stopped. 2. The electronic device according to claim 1, wherein the holding circuit causes the display means to display a predicted value of the equilibrium temperature when the operation of the first and second arithmetic circuits is stopped. thermometer. 3 The second control circuit controls the third signal corresponding to the current point in time before the difference between the third signals corresponding to the two points in time no longer shows an increase beyond the first predetermined range.
when the signal indicates a decrease exceeding a second predetermined range compared to a third signal corresponding to a previous time point, the display means displays a first display indicating this state. An electronic thermometer according to claim 2. 4. The second control circuit is characterized in that when the predicted value output from the second arithmetic circuit exceeds a third predetermined range, the second control circuit causes the display means to display a second display indicating this state. An electronic thermometer according to claim 2. 5. The electronic thermometer according to claim 3, wherein the second control circuit displays the first display on the display means and stops the first and second arithmetic circuits. 6. The electronic thermometer according to claim 4, wherein the second control circuit displays a second display on the display means and stops the first and second arithmetic circuits. 7. The display means includes a liquid crystal display element that visually displays the predicted value, and an illumination means that illuminates the liquid crystal display element, and the second control circuit stops the operation of the first and second arithmetic circuits. 3. The electronic thermometer according to claim 2, wherein the illumination means is turned on for a predetermined period before the electronic thermometer is turned on. 8 The second control circuit performs the first and second calculations when the second signal exceeds a second predetermined elapsed time that is longer than both the predetermined length and the first predetermined elapsed time. The electronic thermometer according to claim 2, characterized in that the operation of the circuit is stopped. 9. The electronic thermometer according to any one of claims 1 to 8, wherein the holding circuit holds the temperature until measurement is started again.