JPH0330096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an electronic thermometer, and particularly to a so-called peak-hold type electronic thermometer that displays the maximum temperature.

(b) Conventional technology Conventional peak-hold type electronic thermometers are
The temperature measuring section measures the temperature at each sample timing, finds the highest temperature among the measured temperatures, holds this highest temperature, and displays it on the display.

In addition, in general, with electronic thermometers, when the sensor is attached to the measurement site after temperature measurement and measurement begins, the detected temperature is initially low, and this detected temperature, that is, the measured temperature, increases exponentially over time, and eventually reaches a predetermined temperature. converges to the value. This convergence value is usually read as body temperature.

Some types of thermometers determine the rate of increase in maximum temperature to determine the point of convergence, detect when the rate of increase in maximum temperature falls below a predetermined value, and at that point activate an alarm such as a buzzer. There is a system that notifies you and prompts you to read the display. In this type of electronic thermometer, the rate of increase to be determined is merely the rate of increase in maximum temperature.

(C) Problems to be Solved by the Invention In the above-mentioned conventional electronic thermometer, the rate of increase in maximum temperature is determined, and the notification means is activated when the rate of increase falls below a predetermined value. Even if the measured temperature drops because the sensor or the like of the temperature measurement unit comes off the measurement site or is temporarily removed by the person taking the measurement, the maximum temperature is maintained at a constant value. Therefore, the increase in maximum temperature has almost stopped, and the notification means is activated when the maximum temperature increase value has become less than a predetermined value. There was a problem in that it caused alarm and led to erroneous measurements.

According to the present invention, even if the measuring section comes off from the measuring site, the notification means will not be activated.
It is an object of the present invention to provide an electronic thermometer that can prevent malfunctions and maintain measurement when a temporarily removed measuring section is attached to a measurement site.

(d) Means for Solving the Problems In order to solve the above problems, the electronic thermometer of the present invention, as shown in FIG. Measured temperature storage means 2 for storing temperature; and maximum temperature storage means 3 for updating and storing the maximum temperature among the measured temperatures.
, an indicator 4 for displaying the maximum temperature, a rate-of-rise detection means 5 for detecting that the rate of increase in the maximum temperature has become below a predetermined value, and a notification means driven in response to the output of the rate-of-rise detection means. 6, and for the maximum temperature,
Detects when the measured temperature has fallen below a predetermined value,
The measured temperature drop detection means 7 uses this detection output to stop the driving function of the notification means 6 by the increase rate detection means 5, and the measurement temperature drop detection means 7 detects the temperature rise after the drop and uses the detection output to stop the driving function of the notification means 6. and a measured temperature rise detection means 8 for initializing the maximum temperature storage means 3.

(E) Function In this electronic thermometer, when the temperature measuring section 1 is attached to the measurement site and measurement is started, the temperature measuring section 1 measures the temperature at each sample timing, and the measured temperature each time is stored in the measured temperature storage means 2. Further, the maximum temperature up to that point is stored in the maximum temperature storage means 3. Then, the maximum temperature is displayed on the display 4. Further, the rate of increase detection means 5 determines the rate of increase in the maximum temperature, and also detects whether the rate of increase is smaller than a predetermined value. If the temperature is rising at the beginning of the measurement, the rate of increase detected by the rate of increase detection means 5 is equal to or higher than the predetermined value, so the measurement continues, and the rate of increase detected by the rate of increase detection means 5 detects that the rate of increase is within the predetermined value. Then, the notification means 6 is driven by the output. When this notification means 6 is driven, the measurement person can see the display 4 by the notification means.
By reading the convergence value, that is, the body temperature can be read.

Furthermore, if a phenomenon such as the temperature measuring section 1 coming off the measuring site occurs for some reason during measurement, the measured temperature begins to drop. Although the maximum temperature stored in the maximum temperature storage means 3 does not change, the measured temperature gradually decreases over time, and when the maximum temperature drops to a certain value or more, this is detected by the measured temperature drop detection means 7. , with this detection output,
The function of the increase rate detection means 5 is stopped. Thereby, even if the maximum temperature value does not change and the rate of increase is smaller than a predetermined value, the notification means 6 is not driven.

Further, when the removed temperature measurement section 1 is attached to the measurement site again, the measured temperature starts to rise again. This is detected by the measurement temperature rise detection means 8,
Accordingly, the stoppage of the driving function of the notification means 6 is canceled, and the maximum temperature storage means 3 is initialized,
After that, we will continue to update the maximum temperature.

(F) Embodiment FIG. 2 is a block diagram of an electronic thermometer showing one embodiment of the present invention.

In the figure, a temperature sensor 11 includes a temperature measuring element such as a thermistor, and converts temperature into an electrical signal.
The A/D converter 12 converts the electrical signal from the temperature sensor 11 into a digital signal and inputs it to the CPU 13. The CPU 13 has a temperature measurement function that takes in the temperature signal from the A/D converter 12 at each sample timing, a function that calculates the maximum temperature from among the measured temperatures, and a function that displays the calculated maximum temperature on the display 15. , a function that calculates the rate of increase in maximum temperature and detects when the rate of increase has fallen below a predetermined value;
Based on this detection, a buzzer 17 is used as a notification means.
When the measured temperature drops, the difference value from the maximum temperature is calculated, and when the difference value exceeds a predetermined value, the increase rate detection function is stopped, and when the measured temperature rises again, It is equipped with a function to detect this, cancel the suspension of the rate of increase detection function, and initialize the maximum temperature. In addition, 14
16 is a memory used to store the measured temperature and maximum temperature, and 16 is a power switch.

Next, the operation of the electronic thermometer of the above embodiment will be explained with reference to the flowchart shown in FIG.

When the power switch 16 is turned on and the operation starts, initialization to the highest value is first performed in step ST1. The initial value of the maximum temperature is selected to be lower than any of the predicted measured temperatures.

Next, the rate of increase is initialized (step
ST2). The rate of increase is expressed as a temperature increase value per predetermined time, and this initial value is selected to be a value of ∞.

After the maximum temperature and rate of increase are initialized, temperature measurement is subsequently performed (step ST3). In other words, the temperature signal detected by the temperature sensor 11 is A/
The data is taken into the CPU 13 via the D converter 12 and stored in the memory 14.

Next, the current measured value is compared with the highest value up to the previous time (step ST4), and if the measured temperature is rising as during normal measurement, the current measured value is higher than the highest value up to the previous time. This determination is YES, and the highest value is subsequently updated, that is, the current measured value is stored as the highest temperature (step ST5).

Next, the rate of increase is determined from the current maximum temperature and the previous maximum temperature, and it is determined whether this rate of increase is less than a certain value (step ST6). At the beginning of the measurement,
Since the maximum temperature is increasing rapidly, this determination is NO, and then in step ST7 it is determined whether or not the measurement is complete. If the power switch 16 is not turned off, this determination will be NO.
Returning to step ST3, the temperature measurement at each sample timing, updating of the maximum value, and determination of whether the rate of increase is smaller than a certain value are repeated as in the previous step.

As the temperature rise progresses and the maximum temperature approaches the convergence value, the rate of increase becomes smaller than the constant value, and the determination in step ST6 becomes YES. and buzzer 17
is turned on, and its beep alerts the measurer that the measured value has reached a convergence state (step
ST8). The measurer hears the sound of this buzzer 17,
By reading the maximum temperature value on the display 15, body temperature can be measured.

In addition, even if the measured value becomes smaller than the previous maximum temperature due to slight fluctuation or dispersion of the measured value, and the judgment in step ST4 is NO, if the difference between the maximum value and the measured value is smaller than a certain value. teeth,
The judgment at step ST9 is NO, and step ST6
and continue measurements similar to those described above. That is, after temperature measurement, the maximum value is not updated, the measurement is continued while the maximum temperature is maintained, and the buzzer 17 is sounded when the rate of increase falls below a certain value.

Now, if the temperature sensor 11 comes off the measurement site for some reason during measurement, the measured temperature value will drop rapidly. Therefore, the determination of "Is the measured value > the highest value?" in step ST4 is NO, and the process moves to step ST9, where the determination of "Is the highest value - measured value > a constant value?" is NO.
YES. In other words, the difference value between the highest value and the measured value becomes equal to or greater than a certain value. Then, the temperature is measured (step ST10), and it is determined whether the measured value has started to rise (step ST11). Temperature sensor 1
1 remains off the measurement site, the measured temperature is falling, and the judgment is NO. From then on, the step will not continue until the measured value starts to rise.
The processes of ST10 and ST11 are repeated.

When the temperature sensor 11 that has been temporarily removed is reattached to the measurement site, the measured temperature starts to rise again. Therefore, the determination at step ST11 becomes YES, and the operation returns to step ST1, where the highest value is initialized. That is, the highest value up to that point is reset, and thereafter the normal operation similar to that at the beginning of the first measurement is resumed.

(G) Effects of the Invention According to the electronic thermometer of the present invention, when the measured temperature falls below a certain value with respect to the maximum temperature, the driving of the notification means is stopped when the rate of increase falls below a predetermined value. Therefore, even if the temperature sensor etc. is disconnected during measurement and the maximum temperature is held at a constant value, the buzzer or other notification means will not be activated, so the measurer cannot judge the convergence and read the maximum temperature in the middle. Therefore, erroneous measurements can be prevented.

In addition, when the measured temperature starts to rise, the prohibition of driving the alarm means is canceled, the maximum temperature is initialized, and the maximum temperature is stored in updated memory from now on, so it is possible to return to body temperature measurement without the risk of erroneous measurements. can. Therefore, even if the temperature measurement part is temporarily removed from the measurement site, or if it becomes temporarily detached for some reason, it will continue to be used until the correct convergence value is reached. Measurements can be taken.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing the configuration of the present invention, Fig. 2 is a block diagram of an electronic thermometer showing one embodiment of the invention, and Fig. 3 is a flowchart for explaining the operation of the electronic thermometer. . 1: Temperature measurement section, 2: Measured temperature storage means, 3:
Maximum temperature storage means, 4: Display, 5: Rise rate detection means, 6: Notification means, 7: Measured temperature drop detection means, 8: Measured temperature rise detection means.

Claims (1)

[Claims] 1. A temperature measurement unit that measures the temperature at each sample timing, a measured temperature storage unit that stores the measured temperature, a maximum temperature storage unit that updates and stores the maximum temperature among the measured temperatures, and a display that displays the maximum temperature. a rate-of-rise detection means for detecting that the rate of increase in maximum temperature has fallen below a predetermined value; a notification means driven in response to the output of the rate-of-rise detection means; A measured temperature drop detection means detects that the temperature has dropped to a temperature lower than 100, and uses this detection output to stop the driving function of the notification means by the rate of increase detection means, and detects a temperature rise after the drop and uses the detection output to notify the notification. An electronic thermometer comprising measurement temperature rise detection means for canceling the stoppage of the drive function of the means and initializing the maximum temperature storage means.