JPS6069526A - Electronic temperature measuring device - Google Patents

Abstract

PURPOSE:To reduce power consumption and to make an automatic response to abrupt temperature possible by detecting the temperature variation and making a specific time different according to the amount of the detected temperature variation. CONSTITUTION:The signal outputted from a timer counting circuit 4 is supplied to corresponding AND gates 8-10 and then supplied to a timing signal generating circuit 12. This timing signal is supplied as an operation command signal to a temperature sensor 13 and an A/D converting circuit 14. The detected temperature is converted into a digital value, which while supplied to a latch 16 through an AND gate 15, is supplied to a latch 18 through an AND gate 17. Temperature data TA and TB outputted by the latches 16 and 18 are supplied to a comparing circuit 20. The comparing circuit 20 outputs a detection signal CX when the amount DELTAT of temperature variation is <=1 deg.C, detection signal CX when 1-3 deg.C, or detection signal CZ when >=3 deg.C. Those detection signals CX, CY, and CZ are supplied as gate opening/closing signals to the corresponding AND gates 8-10.

Description

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

[Background of the invention]

In recent years, electronic wristwatches have become more multifunctional, and electronic wristwatches equipped with temperature measuring devices are being considered. This kind of electronic watch is
The temperature detected by the temperature sensor is converted to a digital value and displayed, but since the temperature sensor consumes a large amount of power, /h type electronic watches such as wristwatches do not require the temperature sensor to be activated at all times. was inappropriate.

Therefore, the applicant of the present application has proposed that it is possible to reduce power consumption by measuring temperature at regular intervals instead of constantly, and also by measuring temperature according to the needs of the user. We proposed an electronic temperature measuring device (Japanese Patent Application No. 56-213869) that can artificially respond to temperature changes.

[Purpose of the invention]

This invention is a further development of the electronic temperature measuring device previously proposed by the applicant, and its purpose is to reduce power consumption and to prevent rapid temperature changes. An object of the present invention is to provide an electronic temperature measuring device that can automatically respond.

[Key points of the invention]

In order to achieve the above-mentioned object, the present invention provides an electronic temperature measuring device that measures and displays temperature at specific time intervals.
The gist of the present invention is to detect a temperature change and to vary the specific time depending on the detected amount of temperature change.

〔Example〕

Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. This embodiment is applied to an electronic timepiece equipped with a temperature measuring device. Oscillation circuit 2 forming clock circuit 1
The reference clock signal (32,768I(z
) is divided by the frequency dividing circuit 3 into IP (pulse)/I S (
seconds) is frequency-divided into a signal (1 signal number) and sent to the counting circuit 4, where it is counted. This counting circuit 4 is connected to the above I P
/IS In addition to counting and outputting time information for hours and minutes based on the S symbol, it also outputs the tp'/los signal (10 second signal) and I
Outputs P/IM (minutes) signal (1-shot signal).

The above-mentioned time information is sent to the decoder 5 and decoded, and then sent to the time display section 7 of the liquid crystal display device 6 to be digitally displayed.

On the other hand, the IP/IS signal outputted from the frequency dividing circuit 3, the IP/10S signal outputted from the counting circuit 4,
The LM signal is supplied to corresponding AND gates 8-10, respectively. Each of these AND gates 8 to 10 is selectively opened, and each output is supplied to a timing signal generation circuit 12 via an OR gate 11. The timing signal generation circuit 12 generates a timing signal based on the IP/IS, IP/10S, and IP/IM signals selectively output from the OR gate 11 and a predetermined frequency signal output from the frequency dividing circuit 3. Generate and output. In this case, the timing signal is a signal that outputs two pulses at each timing, that is, two pulses A and B at each timing shown in FIG. 2(B) at a predetermined time. This timing signal is supplied to the temperature sensor 13 and the A/D (analog/digital) conversion circuit 14 as operation command signals, respectively. Therefore, the temperature sensor 13 and the A/D conversion circuit 14 are operated twice at every timing according to the input timing signal.

The A/D conversion circuit 14 converts and outputs the analog detected temperature measured by the temperature sensor 13 into a digital value, and supplies the digital value to the latch 16 via the AND gate 15. supply In this case, the AND gate 15 uses the QtJ! of the trigger flip 70 (hereinafter referred to as T-FF) 19! The opening and closing of the I output and the AND gate 17 are controlled by the Q output of the T-FF 19. Furthermore, the output state of the T-FF 19 is inverted in accordance with the timing signal applied to its T input terminal. Note that, assuming that the initial state of the T-FF 19 is set to the reset state, the latch 16 stores the temperature data T measured at the time of outputting the pulse A of the timing signal.
A is stored in the latch 18, and the temperature data TB measured when the pulse B is output is stored in the latch 18.

Therefore, the temperature data T output from the latch 16.18
A.

TB is supplied to the comparison circuit 20 as data to be compared.

In the comparison circuit 20, the Q output of the T-FF 19 is connected to the delay circuit 21.
As shown in Figure 8P12 (0), the humidity data TA obtained when the pulses A and B of the timing signal are output,
This is to detect the amount of temperature change ΔT with respect to 'I'E. As a result, the comparator circuit 20 detects that the temperature change amount ΔT is 1, for example.
If the temperature is less than °C, the detection signal Cx is output; if the temperature is 1 °C or more and less than 3 °C, the detection signal CY is output; and if the temperature is 3 °C or more, the detection signal CY is output. signal C2
It is designed to output . These detection signals OX%
CYSOZ is input as a gate opening/closing signal to the corresponding AND gates 8 to 10, respectively.

On the other hand, the temperature data TB output from the latch 18 is read into the latch 23 via the AND gate 22 to which the output signal of the delay circuit 21 is input as a gate opening/closing signal, and then sent to the liquid crystal display device via the decoder 24. The temperature is sent to the temperature display section 25 of No. 6 and displayed digitally.

Next, the operation of the above embodiment will be explained with reference to FIG.

The temperature sensor 13 and the A/D conversion circuit 14 operate according to the timing signal output from the timing signal generation circuit 12. This timing signal is the 21st ffl (
0), two pulses A at each timing,
Since B is a signal output within a predetermined time, the temperature sensor 13 and A/D conversion circuit 14 operate twice at one timing in synchronization with the pulses A and B. Furthermore, since the output state of the T-FF 19 is inverted in synchronization with the pulses A and B, when the pulse A is output, the T-FF19 is
The Q output of the FF 19 becomes "1", and the AND gate 15 is opened, while the AND gate 17 is closed, and on the other hand,
When the above-mentioned pulse B is output, the Qal force of 'L'-FFI9 is "1", and the AND gate 15 is closed,
AND gate 17 is completed. As a result, latch 16
The temperature data TA measured when the pulse A is output is written into the latch 18, and the temperature data TB measured when the pulse B is output is written into the latch 18. After the temperature data TB is written to the latch 18, an output is obtained from the delay circuit 21.
l As a result, the comparison circuit 20 operates, the AND gate 22 is opened, and the temperature data TB is written into the latch 23. The temperature data written in the latch 23 is decoded by the decoder 24 and then displayed on the temperature display section 25.
displayed digitally. Therefore, the displayed temperature is the temperature measured at the second time in one timing.

On the other hand, as a comparison result of the comparison circuit 20, both input temperature data 'I'A, 'I! When the temperature change amount ΔT with respect to B is less than 1°C, the comparison circuit 20 outputs a detection signal Cx. As a result, the AND gate 10 is opened and the AND gate 8.9 is closed, so that the timing signal generation circuit 12 is supplied with the signal 1171M. Therefore, as shown in FIG. 2(A), in the range where the temperature change ΔT is less than 1°C,
As shown in FIG.
signal is output.

Figure 2 (A) shows a temperature curve diagram that changes with time. Temperature change m△T is 1°C or more and less than 3°C in the range of TYl, and 3°C in the range of Tz. over °C,'
Within the range of I'Y2, 1°C or more and less than 3°C, 'I''X
2 indicates a case where the temperature is less than 1°C. In such a case, as shown in FIG. 2(B), the timing signal output from the timing signal generation circuit 12 is 48 seconds with a period of 10 seconds in the range of '['Yl and TY2.
IP/1. It becomes the signal of O8, and also T
In the range of z, it becomes a signal with a period of 1 second, that is, a signal of IP/Is, and further, in the range of '['X2, it becomes a signal of I P/I M.

In this way, the timing signal is selected depending on the amount of temperature change ΔT, so the temperature measurement interval varies depending on the temperature change. Therefore, when a sudden temperature change occurs, for example when the user goes outside from an air-conditioned room in the summer, the amount of temperature change ΔT may exceed 3°C. In such a case, the displayed temperature is a temperature measured every second, so it is possible to sufficiently cope with sudden changes in temperature.

Note that the present invention is not limited to the above embodiments, and can be modified in various ways.For example, the above embodiments are 4°I P/
Although IS, IP/108, and 1171M signals are selected, the more signals that are selected, the better the ability to follow rapid temperature changes. In addition, in the above embodiment, the temperature change was measured twice at one timing to detect the temperature change, but the temperature change was measured once at one timing, and the temperature change was determined by the previous measured humidity and the current measurement. This may be done by comparing temperatures.

〔Effect of the invention〕

As explained in detail above, this invention measures temperature not constantly but at specific time intervals, which makes it possible to significantly reduce power consumption, which is extremely effective for electronic wristwatches that use batteries as a power source. Moreover, since the specific time is made different depending on the amount of temperature change, it becomes possible to automatically respond to sudden temperature changes. For this reason, for example, if applied to an electronic watch with a temperature alarm function that issues an alarm at a set temperature, it becomes possible to issue an alarm at an accurate time in response to temperature changes.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of the H1 circuit to which the present invention is applied, Fig. 2 (A) is a temperature change curve diagram, and Fig. 2 (B) is an output waveform of a timing signal that is modified according to temperature changes. figure,
FIG. 2(0) is a diagram showing pulse signals included within one timing of the timing signal. 12... Timing signal generation circuit, 13...
...Temperature sensor, 14...A/D conversion circuit,
16・ζ・・i−8・・・・Latch, 20・・・・
... Comparison circuit, 25 ... Temperature display section. Patent applicant Casio Computer Co., Ltd. 7.j

Claims (1)

[Claims] An electronic temperature measuring device that measures and displays temperature at specific time intervals includes a temperature change detection means for detecting a temperature change within a fixed time, and a temperature change detection means for detecting a temperature change detected by the temperature change detection means. An electronic temperature measuring device comprising means for setting different times.