JPH0810165B2 - Electronic thermometer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electronic thermometer that estimates and displays a convergence temperature corresponding to body temperature.

(B) Conventional technology Generally, in an electronic thermometer, a body temperature is detected by a temperature sensor, the measured value of the temperature sensor is read into the CPU at a predetermined sampling cycle, and the measured value is displayed while the measured value converges. There is a configuration in which the temperature is estimated and the estimated value is displayed on the display unit instead of the measured value. Then, this estimated value is sequentially updated at a predetermined cycle after the measurement data of a predetermined amount is obtained, and the accuracy is improved.

(C) Problems to be Solved by the Invention In the electronic thermometer described above, the estimation value is conventionally updated at regular intervals, for example, every 2 seconds. On the other hand, although the accuracy of the guess value is low in the initial guess, it improves with time and the guess value does not change so much. However, the update operation is performed at regular intervals despite the fact that the guess value does not change, and thus the display is flickered, which is difficult to see. In particular, it is difficult to read because it is often read when the guess value is stable.

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

(D) Means for Solving Problems The electronic thermometer according to the present invention includes a temperature detecting means for detecting a temperature at a predetermined cycle, and a convergence temperature at a predetermined cycle from a plurality of actual measurement values detected by the temperature detecting means. The estimated value calculation means for estimating the estimated value, the display means for displaying the actual measured value or the estimated value, and the cycle of the update display of the estimated value before and after the elapse of a predetermined time in which the change of the estimated value is small and stable after the start of the measurement. To a cycle longer than the temperature detection cycle.

(E) Action In this electronic thermometer, the temperature detection means detects the temperature at a predetermined cycle, for example, every second, and the estimated value of the converged temperature is determined by the estimated value calculation means from a plurality of actually measured values of the temperature detection means. It is calculated in a cycle, and the estimated value is updated and displayed on the display means for each cycle.

The cycle of update display of the estimated value is changed from the short cycle (for example, 2 seconds) to the temperature detection cycle (for example, 1 second) before and after a predetermined time when the change in the estimated value is small and stable after the start of measurement by the cycle switching means. It is switched to a long long cycle (for example, 10 seconds). Therefore, when a predetermined time has elapsed from the start of measurement,
The update display of the guess value becomes slower, and the variation of the display is reduced.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, reference numeral 1 denotes an electronic thermometer, which is adapted to estimate a converged temperature corresponding to the body temperature from an actually measured value.

The electronic thermometer 1 is composed of a main body 2 and a probe 3 which are integrally formed. The main body 2 has a rectangular body and is formed into a thin rod shape of the probe 3, and a temperature sensor 4 such as a thermistor is housed at the tip of the probe. There is. On the other hand, the main body 2 is provided with a display unit 5, a one-touch type power switch 6 and a buzzer 7, and a control circuit unit 8 is housed inside.

As shown in FIG. 3, the control circuit unit 8 is configured so that the detection signal of the temperature sensor 4 is converted into a digital signal by the A / D converter 9 and read by the CPU 10. Then, the CPU 10 reads the detection signal of the temperature sensor 4, that is, the actual measurement value at a sampling cycle of, for example, one second, and the temperature detection means 11 is constituted by these. CPU10 stores measured value in memory 1
2 is stored, while being output to the display unit 5. Further, the CPU 10 receives a switching signal from the power switch 6 and is supplied with power from the power source 13, while outputting a buzzer signal to the buzzer 7.

In addition, this CPU 10 has an estimated value calculation function that calculates an estimated value of the converged temperature from the actual measurement value, and by determining whether or not 60 seconds have elapsed from the start of measurement, the estimated value has been obtained with accuracy higher than a predetermined value. It also has a function of detecting, and a function of switching the calculation cycle of the guess value from 2 seconds to 10 seconds in response to the lapse of 60 seconds.

Next, the configuration and operation of the electronic thermometer 1 will be described based on the control flow shown in FIG. The step is ST
Say.

First, when the power switch 6 is turned on, it is determined whether or not 1 second has elapsed after the initialization was performed in ST1 (ST2),
The following operations are performed every one second and the process returns to ST2.
When this one second elapses, 1 is added to the timer t (ST
3), temperature data T (t) is read (ST4), that is, 1
Measurement value T (t) of the temperature sensor 4 at a sampling cycle of 2 seconds
Is read by the CPU 10 (temperature detecting means 11).

Then, it is determined whether or not the measured value T (t) is larger than the peak value Tp (ST5), that is, the peak value Tp which is the maximum value among the measured values T (t) after the measurement is started. When it is larger, the peak value Tp is updated (ST6), while when it is smaller, the peak value Tp is held as it is (ST6).
7). Next, it is determined whether or not the measurement time t has passed 30 seconds (ST8), the process proceeds to ST9 until 30 seconds has elapsed, the peak value Tp is displayed on the display 5, and it is determined whether or not the measurement is completed. (ST1
0), return to ST2 until the measurement time t reaches 900 seconds.

When this measurement time t has passed 30 seconds, it moves from ST8 to ST11, determines whether 600 seconds have passed, moves to ST12 until 600 seconds has passed, and when the measurement time t is an even number, moves to ST13. The value Ts is calculated (estimation value calculation means). After that, in ST14, it is determined whether or not the measurement time t has passed 60 seconds, the process proceeds to ST15 until 60 seconds is reached, the estimated amount Ts is displayed on the display 5, and the process returns to ST2 via ST10. On the other hand, when the measurement time t is odd, ST12
If the judgment is NO, the process moves to ST10 and returns to ST2. That is, in ST13, the estimation value Ts is calculated and updated at 2-second intervals, and this update interval is determined in ST12.

Then, when the measurement time t reaches 60 seconds, the process moves from ST15 to ST17, operates the buzzer 7 and moves to ST16. Then, after 2 seconds have passed, the process moves from ST14 to ST18, and it is determined whether or not the measurement time t is a multiple of 10 such as 70 seconds and 80 seconds.
Skip ST16 and move to ST10 until it becomes a multiple of 10 seconds, then 100
When it becomes a multiple of, the process moves to ST16, the estimated value Ts is updated and displayed on the display 5, and the process returns to ST2. That is, in ST18, the update interval of the guess value Ts is changed from 2 seconds to 10 seconds (cycle switching means).

After that, when the measurement time t has passed 600 seconds, the determination in ST11 becomes YES, the process moves to ST9, the peak value Tp of the actual measurement value T (t) is again displayed on the display 5, and 900 seconds has passed or the power switch 6 When is pressed, the determination in ST10 becomes YES and the measurement is completed.

Only the update operation of this display will be outlined again. The peak value Tp of the measured value T (t) is updated and displayed at 1 second intervals from the start of measurement to 30 seconds. Next, from 30 seconds to 60 seconds
Ts is updated and displayed every two seconds (ST12). Since the estimated value Ts is stable from 60 seconds to 600 seconds, it is updated and displayed every 10 seconds (ST18). And, the measured value T from 600 seconds to 900 seconds
Since (t) also approximates the convergence temperature, the peak value Tp is set to 1 again.
Update display every second.

In this embodiment, the update display of the guess value Ts is set to 2 seconds and 10 seconds, but the interval is set to 1 second in the initial stage, and then 2 seconds, 5 seconds, and 10 seconds as the accuracy of the guess value is obtained. For example, the intervals may be sequentially increased.

The body 2 and the probe 3 of the electronic thermometer may be separate bodies.

(G) Effect of the Invention As described above, according to the electronic thermometer of the present invention, the cycle of the update display of the guess value is changed from the short cycle to the temperature before and after the elapse of a predetermined time when the change of the guess value is small and stable after the start of measurement. Since the cycle is switched to a longer cycle than the detection cycle (sampling cycle), there is little change in the estimated value after the elapse of a predetermined time, and it stabilizes.
The updated display cycle is long, the display does not fluctuate, and it is easy to read and extremely easy to read. Also, the update display cycle is short before the lapse of a predetermined time, and the guess value is updated frequently, so it indicates that the body temperature is being measured, that is, the guess is in progress, and it is displayed that the measurement is not completed. Is easy to use. Furthermore, after the elapse of a predetermined time, the estimated value is updated and displayed at a period longer than the temperature detection period, and thus it is less likely to be affected by noise such as body movement and ambient temperature.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
FIG. 1 is a control flow chart of the electronic thermometer of the embodiment, FIG. 2 is a front view of the electronic thermometer, and FIG. 3 is a circuit block diagram of the same. 1: Electronic thermometer, 2: Main body, 3: Probe, 4: Temperature sensor, 5: Display, 10: CPU, 11: Temperature detection means.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-60-69526 (JP, A) JP-A-59-51317 (JP, A) JP-A-58-205829 (JP, A) JP-A-55- 78220 (JP, A)

Claims (1)

[Claims] 1. A temperature detection means for detecting a temperature at a predetermined cycle, an estimation value calculation means for estimating a converged temperature at a predetermined cycle from a plurality of actually measured values detected by the temperature detection means, and the measured value or Display means for displaying the estimated value, and cycle switching to change the cycle of the updated display of the estimated value from a short cycle to a long cycle longer than the temperature detection cycle before and after the elapse of a predetermined time during which the change in the estimated value is stable from the start of measurement Electronic thermometer consisting of means.