JPH0337693B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronic temperature measuring device.

Recently, electronic wristwatches have become more multi-functional, and for example, electronic wristwatches with a temperature measurement device have been developed that operate a temperature sensor by operating a measurement switch and display the detected temperature at the time the measurement switch is operated. There is. In this way, in a portable temperature measuring device, if the ambient temperature suddenly changes, such as when going outside from an air-conditioned room, the temperature sensor has a
Unable to cope with sudden temperature changes, temperature detection is performed transiently. In such a case, if the measurement switch is operated, the temperature at that point in time is measured and displayed even if the detection by the temperature sensor is in a transient state, so it is not possible to measure and display accurate temperature.

In addition, even if the temperature sensor is able to accurately measure the temperature, the measured temperature is the temperature in a transient state due to external temperature changes, and the temperature measured this time is not the final temperature of the measurement target. It may be mistaken for the final temperature of

This invention was made against the background of the above-mentioned circumstances, and its purpose is to provide an electronic temperature measuring device that can notify when the detected temperature is in a transient state of temperature change. It is about providing.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 shows the circuit configuration of an electronic wristwatch with a temperature measuring device to which the present invention is applied. A manual switch S provided outside the timepiece changes the display mode, and its operation signal is applied to the one-shot circuit 1, which outputs a pulse signal. This pulse signal is given to the T input terminal of trigger flip-flop (T-FF) 2,
The output is inverted and applied to one input terminal of the AND gate 3. The T-FF 2 inverts its output state in synchronization with the fall of the pulse signal output from the one-shot circuit 1, and sends out a signal a from its output terminal and a signal b from its Q output terminal. The signal a is applied to the other input terminal of the AND gate 3 as a gate opening/closing signal, causing the AND gate 3 to output a pulse signal, and,
This pulse signal is applied to the timing generation circuit 5 as a signal A via the OR gate 4. When signal A is input, timing generation circuit 5 generates and outputs timing signals B and C based on a clock signal φ of a predetermined frequency, and signal B is output in synchronization with the falling edge of input signal A. One pulse signal, signal C, consists of two pulse signals that are output after signal B is output.
is sent to latches 6 and 7 as a reset pulse,
A signal for clearing the contents, signal C, is given as a driving command to the temperature sensor 8 and the A/D conversion circuit 9 that converts the analog temperature information detected by the temperature sensor 8 into a digital value, and the respective signals are activated. This signal is applied to the T input terminal of the T-FF 10 and inverts its output state. In this case, the pulse width of signal C is
This corresponds to a sufficient time for the D conversion circuit 9 to operate. The temperature data output from the A/D conversion circuit 9 is then passed through the AND gate 11 to the latch 6.
and is also read into latch 7 via AND gate 12. In this case, and gate 1
1 is controlled to open and close by the Q output of the input T-FF10, and the AND gate 12 is controlled by the input T-FF10.
Opening/closing is controlled by the output of FF10. The temperature data held in latch 6 is sent to comparison circuit 13 as data DA, and the temperature data held in latch 7 is sent to comparison circuit 14.
The data is sent out as data DA and read into the display latch 15 via the AND gate 14. The comparator circuit 13 operates in response to an operation command signal supplied from the output of the T-FF 10 via the delay circuit 16, and executes the calculation x-1DA-DB1. In this case, x is a temperature range in which it is recognized that there is almost no temperature change between the two temperatures detected by the temperature sensor 8 at different times, and is a preset value. Therefore, when a carry occurs, the comparator circuit 13 compares the temperature data DA and DB.
When the temperature difference (absolute value) of is larger than the value of x, a signal F having a high level of binary logic level is output. AND gate 14 is an input delay circuit 16
The opening/closing is controlled by the output signal of.
Further, the temperature data held in the display latch 15 is supplied to the display switching circuit 17. The display switching circuit 17 receives the reference clock signal from the oscillation circuit 18 from the output of the frequency dividing circuit 19 (a signal with a period of 1 second).
The output data of a counting circuit 20 is also supplied to obtain time data such as hours and minutes. The display switching circuit 17 selectively switches and outputs the output data of the display latch 15 or the counting circuit 20 according to the input signals a and b. In this case, the signals a and b are , are display switching command signals, and signal a causes the output data of the counting circuit 20 to be output from the display switching circuit 17, and signal b causes the output data of the display latch 15 to be output from the display switching circuit 17. The output data from the display switching circuit 17 is given to the decoder 21, and the decoded output is supplied to the numerical display of the display device 23 via the AND gate 22. The display device 23 is configured by, for example, a liquid crystal display device, and includes a four-digit numerical display 24.
In addition, TIME display 25, TEMP display 26,
It is configured to include a STAN BY display body 27. The TIME display 25 is illuminated by the input signal a, clearly indicating that the data displayed on the numerical display 24 is time data, and the TEMP display 26
is lit in response to the input signal b to clearly indicate that the data displayed on the numerical display 24 is temperature data, and the STAN BY display 27 is controlled to open and close according to the signal b. It lights up when the output signal F of the comparator circuit 13 is applied through the numeral display 24, and clearly indicates that the temperature data displayed on the numerical display 24 is data obtained in a transient state of the temperature sensor 8. It is.

The opening and closing of the AND gate 22 is controlled by an output signal from the display control section 29. The display control unit 29 includes an AND gate 30 to which the signal F and the 1 Hz signal are respectively input, and the AND gate 3.
an AND gate 31 to which an output of 0 and a signal b are input, an AND gate 33 to which a signal F is input via an inverter 32 and a signal b, and AND gates 31, 3.
3 and an OR gate 34 to which the signal a is input, respectively.
The AND gate 22 is opened and closed by the output signal of 4.

Further, the output signal F of the comparison circuit 13 is given to the timer circuit 35 as an operation command signal. The timer circuit 35 generates an output after a certain period of time (for example, one minute) has elapsed from the start of its operation, and provides the output to the OR gate 4.

Next, the operation of the electronic wristwatch constructed as described above will be explained with reference to FIGS. 2 to 5. FIG. 2a shows a display state in the time display mode, in which a high-level signal a is output from the output terminal of T-FF2. As a result, the output data of the counting circuit 20 is sent from the display switching circuit 17, and the AND gate 22 is opened, so that the numerical display 24 displays the time data, for example, as shown in FIG. 2a. "10:35" is displayed. Also, TIME is set by High level signal a.
The display 25 is lit as shown in FIG. 2a.

In this time display mode, switch S is set to 1.
When the pulse signal is operated once, the pulse signal output from the one shot circuit 1 is sent out from the AND gate 3 and given to the timing generation circuit 5 as a signal A.
At the falling edge, the output state of T-FF2 is inverted, and a High level signal b is output from its Q output terminal. As shown in FIG. 3, when the timing generation circuit 5 receives the signal A, it sequentially outputs the signals B and C, so that after the contents of the latches 6 and 7 are cleared, the temperature sensor 8 and the A/D converter are activated. Circuit 9 becomes operational. At the same time, T-FF10
The output state of is inverted, and from its Q output terminal
Hight level signal D is output. For this reason,
At the timing when the first pulse of signal C is output, the output of A/D conversion circuit 9 is output to AND gate 11.
The signal is transferred to and held in the latch 6 via the latch 6. Therefore, at the timing when the next pulse of signal C is output,
The temperature sensor 8 and the A/D conversion circuit 9 operate again, and the output state of the T-FF 10 is inverted, and the Hight level signal E is output from its output terminal. As a result, the output signal DE of T-FF10 is
As shown in FIG. 3, in synchronization with the rise of signal C, during the rising interval, signal D is at High level and signal Q is at Low level. When the signal E reaches the High level, the output of the A/D conversion circuit 9 is transferred to and held in the latch 7 via the AND gate 12, and then an output is obtained from the delay circuit 16 and the A/D conversion circuit 9 The output of the conversion circuit 9 is also transferred to and held in the display latch 15 via the AND gate 14, and the comparison circuit 13 is operated with the output of the delay circuit 16. Therefore, the comparison circuit 13 executes the calculation x-1DA-DB1, and as a result, if no carry occurs, that is, the temperature difference (absolute value) between the temperature data DA and DB from the latches 6 and 7 is x If the value of
As shown in the figure, the output signal F becomes Low level.
Since the signal b from the T-FF2 is now at the Hight level, the display switching circuit 17 switches and outputs the temperature data held in the display latch 15, and the display control unit 29 inverts the signal F. From the AND gate 33 with the output of the inverter 32
Since a Hight level signal is obtained, the AND gate 22 is opened. As a result, display switching circuit 1
Since the temperature data output from 7 is decoded and sent to the numerical display 24, the temperature data output from the numerical display 2
4 shows temperature data obtained at the timing when the second pulse of signal C is output, for example, Fig. 2b.
As shown in the figure, "18.5" ℃ is displayed. Further, a TEMP display 26 is lit on the display device 23,
The display contents of the numerical display body 24 are clearly indicated. That is, when the switch S is operated once in the time display mode, the display is switched to the temperature display mode.

Furthermore, in the time display mode shown in FIG. As shown in FIG. 5, even after the second pulse of the signal C is output, the output F at the High level continues to be generated. As a result, a 1 Hz signal is output from the AND gate 30 of the display control section 29 and is supplied to the AND gate 22 via the AND gate 31 and the OR gate 34, so that the display latch 15 displayed on the numerical display 24 is Contents,
For example, as shown in FIG. 4b, temperature data "25.8" C. is displayed flashing in synchronization with a 1 Hz signal. In addition, in temperature display mode,
The TEMP display 26 is lit in the same way as in the above case, but when the signal F is at the High level, as shown in FIG. 4b, the STAN
The BY display 27 is lit. In other words, when the High level signal F is output from the comparator circuit 13, temperature detection is performed with a slight temporal shift in synchronization with the two pulses of the signal C, and as a result, the temperature suddenly increases during that time. In this case, the detection by the temperature sensor 8 is in a transient state, so
STAN while flashing the temperature display.
The BY display 27 is turned on to clearly indicate its status. In this display state, when one minute has elapsed, an output is obtained from the timer circuit 35 and is applied as a signal A to the timing generation circuit 5 via the AND gate 4. Therefore, the timing generation circuit 5 outputs the signal C after outputting the signal B, as in the case described above. As a result, after the contents of latches 6 and 7 are cleared, the temperature data detected at the timing when the first pulse of signal C is output is transferred and held from A/D conversion circuit 9 to latch 6, and the next pulse is Temperature data detected at the output timing is transferred and held from the A/D conversion circuit 9 to the latch 7, and supplied to the respective comparison circuits 13, and the comparison circuit 13 executes a predetermined calculation again, but in this case. , if the carry is not generated,
As shown in FIG. 5, the output F becomes a low level.
As a result, in the display control section 29, the AND gate 30 is closed and an output is obtained from the AND gate 33, so that the numerical display 24 displays the fourth
As shown in Figure C, the temperature data "28.4" Celsius is lit, and the STAN BY display 27 is turned off.
In other words, when the output F of the comparator circuit 13 is at a low level, as a result of temperature detection being carried out with a temporal shift in synchronization with the two pulses of the signal C, the temperature change during that time is not large; Since the detection by the sensor 8 has passed the transient state and stabilized, the flanging temperature display is stopped and the STAN BY display 27 is turned off.

Furthermore, as a result of the temperature detection operation being executed again after one minute has elapsed as described above, the output F of the comparator circuit 13 is
If it remains at the Hight level, the timer circuit 35 is operated again to repeat the above operation, and the temperature display is flashed until the signal F reaches the Low level, and STAND BY
The state in which the display body 27 is lit is maintained. Then, after several minutes have elapsed, when the detection by the temperature sensor 8 becomes stable and the signal F becomes a low level, the temperature display returns to the state where it is displayed by lighting.

When the switch S is operated once in the temperature display mode as described above, the output state of the T-FF 2 is reversed by the pulse signal from the one-shot circuit 1, and the time display mode is entered in which the signal a becomes High level. Can be switched. In this case, T-FF2
Since the output state of is inverted at the falling edge of the input pulse, no pulse output is obtained from the AND gate 3, and the temperature measurement operation is prohibited.

In the above embodiment, the temperature at the time of operation of the switch S is measured by operating the switch S, but the present invention is also applicable to an arrangement in which the temperature is automatically measured at fixed intervals, for example, at one-minute intervals. In this case, the temperature change may be detected based on automatically measured temperature differences at one-minute intervals;
Similarly to the above embodiment, the timing generating circuit 5 outputs a signal C consisting of two pulses every minute,
The measurement may be performed based on the temperature difference between the pulse intervals.

Further, in the above embodiment, in order to detect the transient state of the temperature sensor, the temperature display is displayed in a flashing manner and the STAN BY display is turned on, but the notification means is not limited to this.

Further, in the above embodiment, outside air temperature is detected, but water temperature or the like may also be detected. Furthermore, it is not limited to what is incorporated into electronic watches.
It may also be other electronic equipment or the temperature measuring device itself.

As explained in detail above, according to the electronic temperature measuring device according to the present invention, it is possible to detect whether the detected temperature is in a transient state of temperature change, and to determine whether the detected temperature is in a transient state of temperature change. Since this is notified when the temperature is detected in a transient state, the inconvenience of mistakenly recognizing the temperature detected in a transient state as the temperature of the object to be measured can be eliminated, and temperature measurement can be performed accurately.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a circuit configuration diagram of an electronic wristwatch with a temperature measuring device to which the present invention is applied, FIGS. 2 and 4 are display state diagrams, and FIG.
FIG. 5 is a timing chart explaining the operation. 5... Timing generation circuit, 6, 7... Latch, 8... Temperature sensor, 9... A/D conversion circuit,
10...Trigger flip-flop, 13...Comparison circuit, 23...Display device, 29...Display control unit.

Claims (1)

[Claims] 1. Temperature detection means for detecting temperature multiple times at different timings, temperature change amount detection means for detecting the amount of temperature change between the plurality of temperature data detected by this temperature detection means, and this temperature change amount detection means. a comparison means for comparing the detected temperature change amount with preset temperature amount data, and a comparison by the comparison means to determine that the temperature change amount is larger than the preset temperature amount data. An electronic temperature measuring device characterized by comprising: a notification means for notifying when a temperature is detected.