JPH0338534B2 - - 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. Operate and notify
There are some devices that prompt 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 sensor, etc. of the temperature measurement part comes off from the measurement site for some reason and the measured temperature drops, the maximum temperature will remain at a constant value, so there will be almost no increase in the maximum temperature, and the rate of increase in the maximum temperature will decrease. There has been a problem in that the notifying means is activated as if the temperature has fallen below a predetermined value, and the notification is made as if the convergence temperature has been reached even though the convergence temperature has not yet been reached, leading to erroneous measurements.

An object of the present invention is to provide an electronic thermometer that can prevent malfunctions by not driving the notification means even if the measuring part comes off the measuring 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.
, a display 4 that displays the maximum temperature, a rate of increase detection means 5 that detects that the rate of increase in the maximum temperature has become below a predetermined value, and is driven in response to the output of the rate of increase detection means 5. Notifying means 6; and measured temperature drop detecting means 7 which detects that the measured temperature has fallen below a predetermined value with respect to the maximum temperature and uses this detection output to stop the driving function of the notifying means 6 by the rate of increase detecting means 5. It is composed of.

(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 detects whether the rate of increase is less than a predetermined value. If the temperature is rising at the beginning of the measurement, the rate of increase detected by the rate-of-rise detection means 5 is equal to or higher than the predetermined value, so the measurement continues, and the rate-of-rise 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 the notification means 6 is activated, the measurement person can read the convergence value, that is, the body temperature by reading the display 4 based on the notification.

It should be noted that if a phenomenon such as the temperature measuring section 1 coming off the measuring site occurs for some reason during the measurement, the measured temperature will start to drop. Although the maximum temperature stored in the maximum temperature storage means 3 does not change, the measured temperature decreases over time, so the measured temperature drop detection means 7 detects when the measured temperature becomes lower than the maximum temperature by a predetermined value. The difference value is detected and the function of the increase rate detection means 5 is stopped by this detection output.

As a result, even if the maximum temperature value does not change and the rate of increase is smaller than the predetermined value, the driving of the notification means 6 is stopped, and the measurer may misread the maximum temperature at that point on the display 4, and the convergence value There is no risk of it being read as body temperature. Erroneous measurements are therefore avoided.

(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 time, and also has a function to calculate the maximum temperature from among the measured temperatures, and displays the calculated maximum temperature on the display 1.
5, a function to calculate the rate of increase in the maximum temperature and detect when the rate of increase has become below a predetermined value, a function to drive the buzzer 17 as a notification means based on this detection, and a function to display the rate of increase in the maximum temperature. On the other hand, it has a function to calculate the difference value when the measured temperature drops and to stop the rate of increase detection function when the difference value exceeds a predetermined value. 14 is a memory used to store the measured temperature and maximum temperature;
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). That is, the temperature signal detected by the temperature sensor 11 is
It is taken into the CPU 13 via the A/D converter 12,
It is 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 it is then determined in step ST7 whether or not the measurement has ended. 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 time.

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. (Very instantaneous descent), the judgment in step ST9 is NO.
Then, the process moves to step ST6 and continues the same measurement as described above. That is, after temperature measurement, the maximum temperature is maintained without updating the maximum value, and the measurement is continued, and when the rate of increase falls below a certain value, the buzzer 17 is sounded.

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 YES.
becomes. In other words, the difference value between the highest value and the measured value becomes equal to or greater than a certain value. Therefore, the operation returns to step ST2, and the rate of increase is initialized, that is, set to ∞. From then on, the temperature is measured at every sampling time, and steps ST4, ST9,..., ST2, ST3
Repeat the process. During this time, the maximum temperature is naturally maintained, but the judgment in step ST6 and the determination in step ST8
Since the buzzer-on process is not performed, the buzzer 17 will not be activated even if the rate of increase in the maximum temperature is below a certain value. Therefore,
The measurer will continue the measurement without making any erroneous readings.

For some reason, the temperature sensor 11 is attached to the measurement site again, the measured temperature starts to rise again, and eventually the measured value approaches the highest temperature value up to that point, and when the difference value becomes smaller than a certain value, step ST9 is performed. When the determination is NO, the process moves to step ST6, and thereafter returns to normal operation. That is, when the rate of increase falls below a certain value, the buzzer 17 is turned on to notify that the measurement has converged.

In this example, normal measurement processing is resumed when the difference between the highest value and the measured value becomes less than a certain value, but normal processing is resumed when the measured value exceeds the maximum value. You may also return it.

(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.

[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 section, 3: Maximum temperature storage section, 4: Display, 5: Increase rate detection means, 6: Notification means, 7: Measured temperature drop 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; An electronic thermometer comprising: a measured temperature drop detecting means for detecting a drop in temperature, and using this detection output to stop a driving function of a notification means by the rate of rise detecting means.