JPS62265541A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To reduce the variance of display by switching the update period of estimated values according to the calculation accuracy of the estimated value. CONSTITUTION:A CPU 10 reads the detection signal of a temperature sensor 4 at a constant sampling period and outputs the signal to a display device 5 while storing it in a memory 12. Further, the CPU 10 has an estimated value calculating function which calculates the estimated value of convergence temperature from the measured values, a function which decides whether or not 60 seconds have passed after the start of measurement to detect the estimated value having accuracy higher than a specific are, and a function which switches the calculation period of the estimated value from 2sec to 10 seconds in response to the 60sec elapse.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an electronic thermometer that estimates and displays a convergence temperature corresponding to body temperature.

(b) Conventional technology Generally, electronic thermometers use a temperature sensor to detect body temperature.
The actual measured value of this temperature sensor is measured at a predetermined sampling period.
Some devices are configured to read into the PU and display this measured value, while estimating the convergence temperature from this measured value and displaying this estimated value on the display instead of the actual measured value. Then, this estimated value is determined after the actual measured value data of a given world is obtained.
It is updated sequentially at a predetermined cycle until the end of the measurement to improve accuracy.

(c) Problems to be Solved by the Invention Conventionally, in the electronic thermometer described above, the estimated value has been updated at regular intervals, for example, at intervals of 2 seconds.

On the other hand, although the accuracy of the guess value is low in Suiken Hatsuho, it improves over time and the guess value does not change much. However, even though the estimated value does not change, the update operation is performed at regular intervals, which has the disadvantage that the display is disorganized and difficult to see. In particular, it was often difficult to read when the estimated value was stable.

In view of the above, the present invention provides an electronic thermometer in which the update interval of the estimated value is changed and the update interval is lengthened in accordance with the accuracy of the estimated value.

(d) Means for Solving Problems The electronic thermometer of the present invention includes a temperature detection means for detecting temperature at a predetermined cycle, and a convergence temperature at a predetermined cycle from a plurality of actual measured values detected by the temperature detection means. an estimated value calculation means for estimating the actual value or the estimated value, and a display means for displaying the actual measured value or the estimated value;
It is comprised of an accuracy detection means for detecting the accuracy of the estimate value calculated by the estimate value calculation means, and a cycle switching means for switching the calculation cycle of the estimate value calculation means in response to the output of the accuracy detection means. .

(E) Function In this electronic thermometer, the temperature detection means detects the temperature at a predetermined period, for example, every second, and the estimated value calculation means calculates a predetermined estimated value of the convergence temperature from a plurality of actual measured values of the temperature detection means. The estimated value is calculated in cycles, and the estimated value is updated and displayed on the display means every cycle.

While the accuracy detection means detects that the accuracy in calculating the estimated value is low, the estimated value calculation means is updated at a fast cycle, for example, every 2 seconds, and the accuracy detection means is in a state where the accuracy in calculating the estimated value is high. When this is detected, the estimated value calculation means is switched to a slower cycle in response to this, and is updated every 10 seconds, for example.

Therefore, as the measurement progresses and the calculation accuracy of the jIE star value is reached, the estimated value display will be updated slowly, and the dispersion of the display will be reduced.

(f) Example Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 2, reference numeral 1 denotes an electronic thermometer, which is designed to estimate a convergence temperature corresponding to body temperature from actual measurements.

This electronic thermometer 1 consists of a main body 2 and a probe 3 that are integrally formed.The probe 3 is formed in the shape of a thin rod in the rectangular body of the main body 2, and a temperature sensor 4 such as a thermistor is housed in the tip of the probe. There is.

On the other hand, the main body 2 is provided with a display 5, a one-touch power switch 6, and a buzzer 7, and a control circuit section 8 is housed inside.

As shown in FIG. 3, the control circuit section 8 is configured such that the detection signal of the temperature sensor 4 is converted into a digital signal by an A/D converter 9 and read into the CPU10. Then, this CPLIIO reads the detection signal of the temperature sensor 4, that is, the actual measurement value, at a sampling period of, for example, every - second, and the temperature detection means 11 is constituted by these. CPU10
is configured to record actual measured values in the memory 12 (1a) and output them to the display 5. Furthermore, a switching signal is input to the CPU10 from the power switch 6, and the power supply 13
While more power is supplied, a buzzer signal is output to the buzzer 7.

In addition, this CPUl0 has an estimated value calculation function that calculates an estimated value of convergence temperature from the actual measured value, and determines whether 60 seconds have passed since the start of measurement to indicate that the estimated value has achieved a predetermined accuracy or higher. It also has a function to detect, and a function to switch the estimated value calculation cycle from 2 seconds to 10 seconds in response to the 60 seconds Pi passing.

Next, the configuration and operation of this electronic thermometer 1 will be explained based on the control flow shown in FIG. In addition, the step is ST
That's what it means.

First, when the power switch 6 is turned on, it is determined whether one second has passed after initialization is performed by the STI (ST2).
, the following operations are performed every second and the process returns to ST2. When this 1 second passes, 1 is added to Kuima L (
ST3), temperature data 'r(t) is read (ST4)
That is, the actual measurement value 'r(t) of the temperature sensor 4 is read into the CPU10 at a sampling period of 1 second (temperature detection means 11).

Next, it is determined whether or not this actual atq value T (L) is larger than the peak value Tp (ST5). When it is larger than the value Tp, this peak value Tp is updated (5T6), while when it is smaller, the peak value Tp is maintained as it is (ST7). Next, it is determined whether the measurement time t has passed 30 seconds or not (578), and the S
The process moves to step T9, where the peak value Tp is displayed on the display 5, and it is determined whether the measurement is completed (5TIO), and the process returns to ST2 until the measurement time t reaches 900 seconds.

When this measurement time t passes 30 seconds, ST8 to S
T1. 1, it is determined whether 600 seconds have elapsed or not, and the process moves to 5T12 until 600 seconds have elapsed. If the measurement time is an even number, the process moves to 5T13, and the estimated value Ts is calculated (estimated value calculation means). After that, the measurement time [is 60
To determine whether or not seconds have elapsed (accuracy detection means), the process moves to 5TI5 until 60 seconds have passed, displays the estimated value Ts on the display 5, and returns to Sr1 via 5T10. On the other hand, measurement time t
When is an odd number, the judgment of 5T12 becomes No, and 5T10
, and then returns to Sr1. That is, at 5T13, the estimated value Ts is calculated and updated at 2 second intervals,
This update interval is determined at 5T12.

After that, when the measurement time reaches 60 seconds, it changes from 5T15 to 5T.
17, the buzzer 7 is activated, and the process moves to 5T16. Then, after 2 seconds have passed, the process moves from 5T14 to 5T18, and the measurement time t is changed to 1, such as 70 seconds or 80 seconds.
It is determined whether the seconds are multiples of 0 or not, and the process continues by 5 until the seconds are multiples of 10.
Skipping T16, the process moves to 5TIO, and when it becomes a multiple of 10, the process moves to 5T16, the estimated value Ts is updated and displayed on the display 5, and the process returns to Sr1. That is, at 5T18, the update interval of the estimated value Ts is changed from 2 seconds to 10 seconds (cycle switching means).

Further, when the measurement time t has passed for 600 seconds, 5TI
The judgment of I becomes YES, and the process moves to Sr9, where the actual measured value T is determined again.
The peak value Tp of (t) is displayed on the display 15, and when 900 seconds have elapsed or the power switch 6 is pressed, the judgment of 5TIO is Y.
The measurement ends with ES.

To briefly explain only the updating operation of this display, the peak value 'rp of the actual measurement value T(t) is updated and displayed at 1 second intervals for 30 seconds from the start of measurement. Next, from the 30th to the 60th second, the estimated value Ts is updated and displayed every 2 seconds (ST12).

The estimated value Ts is also stable from 60 seconds to 600 seconds, so
Update display at 10 second intervals (ST18), and 60
Since the measured value T(t) also approximates the convergence temperature from 0 seconds to 900 seconds, the peak value Tp is updated and displayed again at 1 second intervals.

In this embodiment, the estimated value Ts is updated at intervals of 2 seconds and 10 seconds, but initially it is displayed at intervals of 1 second, and thereafter,
2 seconds, 5 seconds, 10 seconds as the accuracy of estimate value calculation is obtained.
The interval may be increased sequentially, such as seconds.

In addition, in the example, the elapsed time from the start of measurement is used as the standard to detect the calculation accuracy of the estimated value, but instead of this, the difference value between the estimated value and the actual measured value, the rate of increase in the actual measured value, etc. are used as the standard. You may also do so.

Moreover, the main body 2 and the probe 3 of the electronic thermometer may be separate bodies.

(1.) Effects of the Invention As described above, according to the electronic thermometer of the present invention, since the update period of the estimated value is switched according to the calculation accuracy of the estimated value, it is short in the initial stage when the estimated value is easy to change. While it is updated at regular intervals, it can then be updated at longer intervals when it stabilizes, so the display is less likely to flicker and is extremely easy to read.Especially when the estimated value is stable, it can be updated at longer intervals. Since there are many, it is easy to see.

[Brief explanation of drawings]

FIGS. 1 to 3 show one embodiment of the present invention.
The figure is a control flow diagram of the electronic thermometer according to the embodiment, FIG. 2 is a front view of the electronic thermometer, and FIG. 3 is a circuit block diagram of the electronic thermometer. 1: Electronic thermometer, 2: Main body, 3 Nib probe, 4: Temperature sensor, 5: Display,
10: CPLI, ll: Temperature detection means. Patent applicant Tateishi Electric Co., Ltd. (and 1 others)
given name)

Claims (1)

[Claims] (1) Temperature detection means for detecting temperature at a predetermined cycle; estimated value calculation means for estimating a convergence temperature at a predetermined cycle from a plurality of actual measured values detected by the temperature detection means; and the actual measured value or estimated value. display means for displaying; and accuracy detection means for detecting the accuracy of the guess value calculated by the guess value calculation means;
and cycle switching means for switching the calculation cycle of the estimated value calculation means in response to the output of the accuracy detection means.