JPS62162931A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To prevent a display from being erased when a switch is misoperated after the end of measurement by inhibiting the switch from being operated until measured temperature drops below a specific value. CONSTITUTION:The electronic clinical thermometer 1 is equipped with a main body part 2 and a measurement part 3. Then, the temperature of a sensor 7 corresponding to bodily temperature is inputted to a CPU 9 through an A/D converter 8 and stored in a memory 10. The CPU 9 updates the highest value of the measured temperature and holds it is a memory 10, and also sends it as the bodily temperature to a display device 4. Further, the CPU 9 calculates the difference value between the highest temperature and measured temperature and decides that the difference value increases above a value Tsk1 and that the difference value increases above a value Tsk2, thereby inhibiting the operation stopping function of the switch 5 until the difference value increases above the value Tsk2 from the decision point of lowering to the value Tsk1.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an electronic thermometer, and particularly to an electronic thermometer having a switch that alternately starts and stops operating each time it is operated.

(B) Conventional Technology Some electronic thermometers use a so-called one-touch type power switch, which is located near the display section. In this type of electronic thermometer, when the power switch is operated once, the power is turned on and measurement operation starts, and when the power switch is operated once again, the power is turned off and measurement stops. If you operate it one more time, the power will turn on again. In other words,
Each time the switch is operated, the measurement operation starts and stops alternately.

(C) Problems to be Solved by the Invention Generally, electronic thermometers are small, so in electronic thermometers that use the one-touch power switch described above, the person taking the electronic thermometer may accidentally touch the switch when removing the electronic thermometer from the measurement site. The problem was that the power would turn off and the measured temperature display would disappear.

The present invention has focused on the above-mentioned problems, and an object of the present invention is to provide an electronic thermometer in which the display does not disappear even if the switch is erroneously operated after the measurement is completed.

(d) Means for Solving Problems The electronic thermometer of the present invention includes a switch (5) that alternately performs an operation start function and an operation stop function each time it is operated, and temperature measurement means (7, 8, 9). and maximum temperature storage means (10
, Sr1, Sr6.5T13.5T14) and a display means (4, Sr7.5T15) for displaying this maximum temperature, the first determination is to determine that the measured temperature has fallen by a predetermined value from the maximum temperature. means (ST18), second determining means (ST17) for determining that the predetermined value has further decreased from the time determined by the first determining means, and Prohibition means for prohibiting the operation stop function (Sr21 to 5T23)
It is characteristically equipped with the following.

(e) Function In this electronic thermometer, when the switch is operated, the measurement operation is started. If the switch is operated again before the first determining means determines that the temperature measurement value has decreased, the measuring operation stops and the display on the display means also disappears. If the switch is operated after the temperature measurement value starts to drop and the first discrimination means obtains a discrimination output, and before the second discrimination means determines that the temperature has dropped by a predetermined value, the switch stops operating. Function is prohibited. Therefore, even if the switch is operated during this time, the operation of the electronic thermometer will not stop and the display on the display will not disappear.

When the switch is operated after the temperature measurement value has fallen enough to obtain a discrimination output by the second discrimination means, the operation of the electronic thermometer is stopped.

(f) Examples The present invention will now be explained in more detail with reference to Examples.

FIG. 3 is an external plan view of an electronic thermometer according to an embodiment of the present invention. This electronic thermometer 1 is composed of a main body part 2 and a thin rod-shaped measuring part 3.A display 4, a one-touch switch 5, and a buzzer 6 are provided on the surface of the main body part 2, and at the tip of the measuring part 3. A temperature sensor 7 such as a thermistor is provided.

FIG. 4 is a circuit block diagram of the electronic thermometer 1 according to the embodiment. The temperature corresponding to the body temperature is converted into an electric signal (analog quantity) by the temperature sensor 7, converted into a digital value by the A/D converter 8, and taken into the CPU 9, and stored in the memory 10 as measured temperature data. It has become.

The CPU 9 updates the maximum value of the measured temperature, stores it in the memory 10, and displays it on the display 4 as body temperature.

In addition, the rate of increase in the measured temperature is calculated, and it is determined whether the rate of increase has become smaller than a predetermined value of , operates a buzzer 6 to notify the user to read the temperature displayed on the display 4 as body temperature.Furthermore, the difference value between the maximum temperature and the measured temperature is calculated,
This difference value is the first predetermined value 'r'sk, (e.g. 0.1°C
), a function to determine that the difference value has exceeded the second predetermined value Tsk (e.g. 2°C), and a function to determine that the difference value has exceeded the second predetermined value Tsk (e.g. 2°C); It has a function of inhibiting the operation stop function of the switch 5 until the second predetermined value is exceeded.

Next, the software configuration and operation of the embodiment electronic thermometer 1 will be explained with reference to flowcharts shown in FIGS. 1 and 2.

First, when the switch 5 is operated, the electronic thermometer 1 starts operating in response to the turning on of the switch 5, and initialization processing such as clearing the memory 10 is performed [Step ST (hereinafter referred to as ST) 1]. Thereafter, the processing from ST3 onward is performed every time a sample timing (eg, 1 sec) arrives (Sr2).

At Sr3, it is determined whether the flag F is 1 or not.

This flag F is a flag that is set when the measured value (displayed body temperature) reaches a readable point.
l=O. Therefore, the judgment for Sr3 is NO,
The temperature measurement value Tx at this point is determined (Sr1
), this temperature measurement value Tx is the maximum temperature Tmax up to that point.
5T5), if Tx>Tmax, update the current temperature measurement value Tx as the maximum temperature Tmax.
T6), if Tx>Tmax, leave as is,
The maximum temperature Tmax is displayed on the display 4 as the measured body temperature (Sr1).

Next, the temperature measurement value at the previous sample timing is subtracted from the temperature measurement value at the current sample timing to calculate the temperature increase rate X ("C/5ec)" (Sr1). Value Xk (Example: Xk=0.1
℃/5ec) or less (Sr1).

If this determination is No, it means that the temperature measurement value Tx is rising between points a and b in FIG. 5, and in this case, the processes Sr2 to ST9 are repeated every time the sample timing arrives.

When the temperature increase rate X eventually reaches Xk, the determination of Sr1 becomes YES, and then the buzzer 6 is turned on for a predetermined period of time, a notification is made by a buzzer sound (ST10), and the flag F is set to l (STll). ). By the buzzer notification made at this point, the measuring person can know that the temperature displayed on the display 4 has almost reached equilibrium with the body temperature and can be read (point b in FIG. 5).

At the next sample timing, flag F,=1, so
If the determination of Sr3 is YES, the process moves to 5T12, obtains the temperature measurement value Tx, updates the maximum temperature Tmax, and displays it (ST13 to 5T15). Therefore, 5T12...
. , 5T15, the same processing as Sr4, . . . , Sr1 is performed. Subsequently, the current temperature measurement value Tx is subtracted from the maximum temperature Tmax to obtain a difference value Tsx (ST16), and this difference value Tsx and predetermined values T s k,, T s k, are compared ( ST17.
5T18). When the thermometer 1 is removed from the measurement site and the temperature measurement value Tx is rising, the judgments of 5T17.5T18 are all NO and return to Sr2, and from then on, Sr2
,..., the process of 5T18 is repeated. In this case, it means that the vehicle is moving between points b and C in FIG.

When the measurer removes the measurement part 3 from the measurement site, the temperature measurement value T
Since x descends immediately, the decision for 5T1B is YES first.
Therefore, the flag F2 is set to 1 (ST19). This flag F2 is a flag that is set when, after the measured temperature becomes readable, the measured temperature value drops by a relatively small predetermined value TSk1 or more relative to the maximum temperature and starts to drop (
(See point 0 in Figure 5).

Furthermore, when the temperature measurement value Tx decreases and the difference value Tsx becomes larger than the second predetermined value Tsk (point d in FIG. 5), 5
The determination at T18 is YES, and flag F3 is set (Sr20).

Now, a case will be described in which the switch 5 is operated while the electronic thermometer of the above embodiment is in operation.

When the switch 5 is operated, the interrupt processing shown in FIG. 2 proceeds in response to its turning on. First, if the operation of the thermometer 1 has reached point C in FIG. 5 and the temperature measurement value has not yet started to fall, the flag F2 is O, so it is determined whether F2 of 5T21 is 1. becomes No, and the operation is stopped (Sr23).

When the operation of the thermometer 1 exceeds the point C and reaches the point d in FIG. The process returns with a YES determination at 5T21 and a NO determination at 5T22. In other words, in response to the operation of switch 5,
No processing is performed and the operation is prohibited from stopping.

Next, when the operation of the thermometer 1 is in the state after point d in FIG. Then, the operation is stopped (Sr23)
.

In addition, in the above embodiment, the case where a temperature sensor, an A/D converter, a CPU, etc. are used as the temperature measurement means was given as an example, but in this invention, the temperature measurement means is limited to those in the embodiment. Instead, other well-known means may be used, such as a sensor that connects a thermistor and a standard resistor to an oscillator and outputs a digital temperature value by comparing the oscillation frequencies.

(g) Effects of the Invention According to this invention, the switch's operation stop function is prohibited until the measured temperature starts to drop and falls below a predetermined value, so the electronic thermometer can be removed from the body. Even if the switch is operated by mistake, the operation is prohibited and invalidated, so that inconveniences such as the display disappearing can be avoided.

In addition, since the prohibited period is not defined by the time from when reading is possible, in order to ensure accurate measurements, the switch's operation stop function can be prohibited even after measurement has been completed and after a long period of measurement. .

[Brief explanation of drawings]

FIG. 1 is a main flow diagram for explaining the software configuration and operation of an electronic thermometer according to an embodiment of the present invention, and FIG.
3 is an external plan view of the electronic thermometer of the embodiment, FIG. 4 is a circuit block diagram of the electronic thermometer of the embodiment, and FIG. 5 explains the operation of the electronic thermometer of the embodiment. It is an explanatory view showing temperature measurement value change for. 4: Display, 5: Switch, 7: Temperature sensor, 9: CPU, 10: Memory. Patent applicant Tateishi Electric Co., Ltd. Agent
Patent Attorney Shigeru Nakamura Figure 3

Claims (1)

[Claims] (1) A switch that alternately performs an operation start function and an operation stop function each time it is operated, a temperature measurement means, a maximum temperature storage means for updating and retaining the maximum temperature measured by the temperature measurement means, and In an electronic thermometer that includes a display means for displaying the maximum temperature, a first determination means for determining that the measured temperature has decreased by a predetermined value from the maximum temperature, and a further decrease by a predetermined value from the time of determination by the first determination means. An electronic clinical thermometer comprising: second determining means for determining whether the switch has been activated; and inhibiting means for prohibiting the operation stop function of the switch from the first determining time to the second determining time.