JPH0530206B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic temperature measuring device that digitally converts and displays a temperature detected by a temperature sensor.

Recently, electronic wristwatches have become more multifunctional, and electronic wristwatches equipped with temperature measuring devices are being considered. This type of electronic wristwatch is sensitive to the temperature itself, so it can accurately measure and display the outside temperature when the wristwatch is not being carried, but when it is being carried (when worn on the wrist), it can accurately measure and display the outside temperature. Due to the influence of the temperature of the arm (body temperature), the temperature sensitive to the temperature sensor does not correspond to the outside air temperature, making it impossible to accurately measure the outside air temperature.

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 accurately measure and display the outside temperature even if it is affected by body temperature when carried. It's about doing.

Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. This embodiment shows a case where the present invention is applied to an electronic wristwatch equipped with a temperature measuring device. The reference clock signal output from the oscillation circuit 2 constituting the clock circuit 1 is frequency-divided into a 1-second signal (1 Hz signal) by the frequency dividing circuit 3, and sent to the counter circuit 4, where it is counted. . The counting circuit 4 counts and outputs hour, minute, and second time information, day of the week information, and date information of the month and day based on the one-second signal, and outputs it to the display device via the display switching control section 5. Sent to 6.

Further, the switch section 7 is configured to include manual switches S ₁ to _{S 4} provided outside the timepiece. In this case, switch _S1 is a switch for measuring and canceling the temperature at that point in time when it is operated, and switch _S2 is a mode changeover switch for switching between external temperature setting mode, temperature measurement mode, and clock mode. Switch S ₃ and S ₄ are
In the external temperature setting mode mentioned above, it is used to set the external temperature data obtained by accurately measuring the external temperature with a thermometer, etc., and the switch S ₃ increases the set temperature by +1°C each time it is operated. Switch S ₄ decreases the set temperature by -1℃ each time it is operated.
1 switch. Therefore, each of these switches S ₁
The outputs of ~ _S4 are given to the switch control section 8, respectively.

The switch control section 8 outputs various control signals according to the output of the switch section 7, and outputs display switching commands to the display switching control section 5, signals a, b, It is designed to output c and d. The signal d is applied to an OR gate 10 to which a 1P (pulse)/1M (minute) signal output from the counting circuit 4 is input. The output of the OR gate 10 is a temperature sensor 11, an A/D (analog/digital) conversion circuit 12 that converts the temperature detected by the temperature sensor 11 into a digital value,
A temperature correction circuit 13 that corrects the temperature converted by this A/D conversion circuit 12 based on the influence of the human body.
This is an operation command given to each circuit to operate each circuit. In addition, the signals a, b, and c are transmitted to the temperature correction circuit 1.
3, and the signals a and b are
The signal c, which is a signal for setting an accurate external temperature in the temperature correction circuit 13, is a calculation command for causing the temperature correction circuit 13 to execute a predetermined calculation.

The temperature converted by the A/D conversion circuit 12 is read into the latch 14, and the temperature corrected by the temperature correction circuit 13 is read into the latch 15 and sent to the display switching control section 5, respectively. In this case, latch 1
4. Temperature read in uncorrected temperature, latch 15
The temperature read in is called the corrected temperature. Further, the accurate external temperature set in the temperature correction circuit 13 is sent to the display device 6 via the display switching control section 5.

Next, details of the display switching control section 5 and the switch control section 8 will be explained with reference to FIG. The switch control section 8 is provided with one-shot circuits 16-19 which respectively output pulse signals when the operation signals of the corresponding switches _S1 - _S4 are applied.
The pulse signal output from the one-shot circuit 16 is sent to a trigger flip-flop (T-FF).
20 and inverts its output state. The Q and output of this T-FF20 are:
The signals are applied to decoders 21, respectively. Further, the pulse signal output from the one-shot circuit 17 is applied to the ternary counter 22, and increments its contents by +1. The ternary counter 22 changes its contents as "0", "1", "2", "0", etc. every time the output pulse of the one-shot circuit 17 is applied. ", "1", and "2" correspond to the clock mode, temperature measurement mode, and external temperature setting mode, respectively, and each bit output is given to the decoder 21, respectively. Furthermore, the pulse signals output from the one-shot circuits 18 and 19 are provided to decoders 21, respectively.

The decoder 21 sends out decoded outputs from lines _l1 to _l12 depending on the combination of input signals. line
The decode output from l ₁ is the one-shot circuit 23.
is applied to output the signal d. Line l ₂ ~ _{l 9}
The decoded output from is a display switching command output to the display switching control section 5. line l ₁₀ ~
The decoded outputs from l ₁₂ are signals a, b, and c that are output to the temperature measuring device 9.

The display switching control unit 5 includes gate circuits 24 to 26 to which date information, day of the week information, and time information are inputted from the counting circuit 4, and a gate circuit 27 to which set temperature data is inputted from the temperature correction circuit 13. , gate circuits 28 and 29 to which temperature data with correction is input from latch 15, and gate circuits 30 and 31 to which temperature data without correction is input from latch 14. And gate circuits 24 to 31
are controlled to open and close in accordance with display commands output from lines l2 _{to l9} of the switch control section 8. Thus, the output contents of each gate circuit 24 to 31 are sent to the display device 6.

The display device 6 includes a first numerical display section 32 that digitally displays time information and set temperature in a lower part thereof;
A character display section 33 displays day of the week information and display mode information in alpha alphabet letters in the middle section, and a second numerical display section 34 digitally displays date information and measured temperature information (temperature information without correction or temperature information with correction). , and an analog display section 35 that displays measured temperature information (uncorrected temperature information or corrected temperature information) in analog form. In this case, the analog display section 35 displays a temperature of 1° C. to 40° C. in units of 1° using, for example, 40 display elements arranged in series. Therefore, gate circuit 2
The output contents of numbers 4, 29, and 30 are sent to the second numerical display section 34 and are switched and displayed. Further, the output contents of the gate circuit 25 are sent to the character display section 33 and displayed. Further, the output contents of the gate circuits 26 and 27 are sent to the first numerical display section 32 and are switched and displayed. Further, the output contents of the gate circuits 28 and 31 are sent to an analog display section 35 and are switched and displayed.

Next, details of the temperature correction circuit 13 will be explained with reference to FIG. The temperature correction circuit 13 is provided with an arithmetic circuit 37 to which temperature information converted by the A/D conversion circuit 12 is inputted via a latch 36. This arithmetic circuit 37 calculates the A/D based on the following equation.
The temperature converted by the conversion circuit 12 is corrected.

T _B = AT _A + B ∴T _A = T _B -B/A T _A ...Outside temperature, T _B ...Temperature detected by the sensor when carrying the watch, A...Primary coefficient, B...Constant In other words, temperature sensor 11 The relationship between the detected temperature (sensor temperature) and the outside air temperature is as shown in FIG. Here, when the watch is not carried, that is, when the watch is removed from the wrist, the sensor temperature changes equivalently in proportion to the outside air temperature, as shown at A in FIG. Furthermore, when the watch is carried, the body temperature is affected by the user's body temperature, how the watch is worn, etc., and changes as shown in B and C in FIG. 4. The changes in B and C in Figure 4 are that the sensor temperature is influenced by body temperature and starts to rise from an initial value of 20°C or higher as the outside temperature rises; is influenced more by body temperature than by the change in C, and its initial value is larger than that by the change in C. As described above, although there are variations in the linear coefficient a and the constant b depending on the influence of body temperature, when the outside temperature is 37° C., the changes A, B, and C in the sensor temperature become the same. Therefore, if we know the exact temperature measured by the thermometer and the sensor temperature when carrying the watch at a certain level of outside temperature, we can calculate the linear coefficient A and constant B depending on the user. You can ask for it. Therefore, the arithmetic circuit 37 calculates the linear coefficient A and the constant B from the simultaneous quadratic equations T _B = AT _A + B, and then performs temperature correction according to the equation T _A = T _B - B/A. I'm starting to do it. The arithmetic circuit 37 also includes an X register for display,
It has various registers such as Y register for calculation,
And the matching temperature based on Fig. 4 is stored in the specified register.
37℃ is stored in advance. And arithmetic circuit 3
7 is the output of the input OR gate 10 and the above formula T _A
=T _B -B/A is executed, and with the input calculation command C, the calculation operation is performed to obtain A and B based on the contents of the up-down counter 39 input via the gate circuit 38. Execute. The arithmetic circuit 37 transfers the calculated values of A and B to the A register 42 and the B register 43 via the gate circuits 40 and 41 which are opened by the signal C, and also transfers the calculated values of A and B to the A register 42 and B register 43. The contents of the register 43 are transferred to gate circuits 44 and 45 which are opened by the output of the OR gate 10.
It is now possible to enter it through the . The up-down counter 39 has its contents incremented by +1 each time signal a is applied to its + input terminal, and decreases by -1 each time signal b is applied to its - input terminal. Then, an accurate external temperature is set, and the set temperature is determined by the temperature correction circuit 13.
and sent to the display switching control section 5. Furthermore, the temperature corrected by the arithmetic circuit 37 is calculated by the latch 1.
Sent to 5.

Next, the operation of the electronic wristwatch equipped with a temperature measuring device constructed as described above will be sequentially explained in accordance with the display state shown in FIG. First, 3 of the switch control section 8
When the contents of the digit counter 22 are "0", that is, the clock mode is set, and the T-
When the output of FF20 is logical value “1”, logical value “1” is output from lines l ₂ , l ₃ , l ₄ , l ₆ of decoder 21.
A signal is output to open the gate circuits 24, 25, 26, and 28 of the display switching control section 5, respectively. As a result, the date information output from the gate circuit 24 is sent to the second numerical display section 34, the day of the week information output from the gate circuit 25 is sent to the character display section 33, and the gate circuit The time information outputted from the gate circuit 26 is sent to the first numerical display section 32, and the corrected temperature information outputted from the gate circuit 28 is sent to the analog display section 35.
As a result, the display content on the display device 6 becomes as shown in FIG. 5A. In this case, the analog display section 35
The displayed temperature is changed every minute. That is, the temperature sensor 11, the A/D conversion circuit 12, and the temperature correction circuit 13 are automatically operated at 1-minute intervals using the 1P/1M signal output from the counting circuit 4. After the detected temperature is converted into a digital value by the A/D conversion circuit 12, a correction is made by the temperature correction circuit 13 using the correction formula T _A = T _B - B/A, and this corrected temperature is Since the temperature is sent to the analog display section 35 via the latch 15 and the display switching control section 5, the temperature automatically measured at one-minute intervals is corrected and displayed on the analog display section 35.

Next, in the watch mode, when switch _S1 is operated once, the output state of T-FF20 is inverted by the pulse signal output from the one-shot circuit 16, and its Q output becomes a logical value "1", and the decoder 21 Logical value “1” from lines l ₁ , l ₃ , l ₄ , l ₆ , l ₇
signal is output. As a result, the temperature sensor 11, the A/D conversion circuit 12, and the temperature correction circuit 13 are operated by the pulse signal d output from the one-shot circuit 23, so that when the switch _S1 is operated, the temperature is measured. In other words, if switch S ₁ is operated while temperature is being measured automatically at 1-minute intervals, the temperature at that point will be measured, and manual temperature measurement will be different from automatic temperature measurement. It becomes possible. When a signal with a logical value of "1" is output from the lines l ₃ , l ₄ , l ₆ , l ₇ of the decoder 21, the gate circuits 25, 26, 28, 29 of the display switching control section 5 are opened. be done. As a result, the temperature measured at the time of operation of the switch _S1 is corrected by the temperature correction circuit 13 on the second numerical display section 34, and this corrected temperature is displayed as date information and a switching display as shown in FIG. 5B. be done. In this display state, if switch S ₁ is operated one more time, T-
The output state of the FF20 is inverted and its output becomes the logical value "1" again, so that the state returns to the state shown in FIG. 5A.

Next, in the display state of FIG. 5A, switch
When _S2 is operated once, the content of the ternary counter 22 is incremented to "1" by the pulse signal output from the one-shot circuit 17, and the temperature measurement mode is set. In this temperature measurement mode, the lines l ₄ , l ₈ , and l ₉ of the decoder 21 indicate a logical value “1”.
This signal is output, and the gate circuits 26, 30, and 31 of the display switching control section 5 are opened. As a result, as shown in FIG. 5C, in addition to the time information being displayed on the first numerical display section 32, the uncorrected temperature output from the gate circuit 30 is displayed on the second numerical display section 34, and , the uncorrected temperature output from the gate circuit 31 is displayed on the analog display section 35.

Therefore, in such a temperature measurement mode,
Further, when the switch _S2 is operated once, the contents of the ternary counter 22 are incremented to "2", and the external temperature setting mode is set. In this setting mode, signals of logical value "1" are output from lines l ₅ , l ₈ , l ₉ of the decoder 21, and the gate circuits 27, 30, 31 of the display switching control section 5 are opened. As a result, the set temperature output from the gate circuit 27 is switched and displayed on the first numerical display section 32. In this case, the content of the up-down counter 39 is "0" at first, so the set temperature displayed is "0".
It is becoming. When setting a set temperature, for example, an accurate outside temperature measured with a thermometer, on the up/down counter 39, the switch _S3 or the switch _S4 is operated. For example, if we set the outside temperature to 20℃,
Operate Switch S ₃ 20 times. As a result, the pulse signal output from the one-shot circuit 18 is applied to the decoder 21, so that it is output as a signal a from the line _l10 of the decoder 21, and is input to the + input terminal of the up-down counter 39. Therefore, the up-down counter 39 is set to a value corresponding to the number of times the switch _S3 is operated, and as shown in FIG.
It will be as shown below. In this case, the mode display "SE-" is displayed on the character display section 33, clearly indicating that the content displayed on the first numerical display section 32 is the set temperature. Furthermore, when switch _S4 is operated in the external temperature setting mode, the pulse signal output from the one-shot circuit 19 is output as signal b from the decoder 21 and is applied to the -1. input terminal of the up-down counter 39. The contents of the down counter 39 are set to a negative value according to the number of times the switch _S4 is operated. Note that in the external temperature setting mode, the gate circuit 30,
The uncorrected temperature output from 31 "For example, 31
℃” is shown on the second numerical display section 3 as shown in FIG. 6D.
4 and is displayed in analog form on the analog display section 35.

In this way, when the accurate external temperature setting is completed, switches S ₃ and S ₄ are operated simultaneously. As a result, the calculation circuit 37 of the temperature correction circuit 13 executes calculation according to the following equation, and
Calculate the value of

Now, set 20℃ as the exact value of the outside temperature,
At this time, the temperature detected by the temperature sensor 11 (temperature without correction) is 31°C, so 31 = 20A + B ... (1) 37 = 37A + B ... (2) From the following two equations, equation (2) - (1 ), 6=17A ∴A=0.353 Substituting this value of A into equation (2), B=37−13.059 ∴B=23.94 is obtained.

The values of A and B thus obtained are set in the corresponding A counters 42 and 43.

Therefore, the contents of the A counter 42 and the B counter 43 are changed every time the output of the OR gate 10 is given.
It is transferred to the arithmetic circuit 37, and the arithmetic circuit 37 calculates T _A = T _B -23.94/0.353 (°C) based on the contents (sensor temperature) of the A/D conversion circuit 12 sent from the latch 36. . The temperature corrected in this way is
Accurate outside temperature that is not affected by body temperature.

Note that this invention is not limited to the above embodiments,
Various modifications can be made without departing from the scope of this invention. For example, by using the least squares method from accurate external temperatures and sensor temperatures at multiple points,
It is also possible to calculate A and B of T _B = AT _A + B, or to directly prompt the sensor temperature to increase without calculating the values of A and B in advance using accurate external temperature and sensor temperature. The values of A and B may be determined proportionally based on the accurate external temperature set in advance at the time of temperature measurement and the sensor temperature detected at the time of setting the external temperature.

In addition, although the above embodiment shows the case where it is incorporated into an electronic wristwatch, if it is a portable electronic device,
It is not limited to electronic watches.

Furthermore, in the above embodiment, the outside air temperature is measured, but the water temperature may also be measured.

As described above in detail, according to the electronic temperature measuring device according to the present invention, the temperature is measured based on the accurate external temperature set from the outside and the sensor temperature detected by the sensor at the time of setting the external temperature. Since the sensor temperature is corrected and displayed,
Even if the temperature detected by the temperature sensor is affected by body temperature when carried, it can be accurately measured and displayed, and it is also possible to accurately measure and display the temperature detected by the temperature sensor. The effect of body temperature will vary depending on the way the product is worn, but even in such cases, it has the excellent effect of being able to prevent the effects of body temperature depending on the user's body temperature or the way the product is worn. .

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to an electronic wristwatch. FIG. 1 is a circuit diagram of the electronic wristwatch, and FIG. 2 shows the display switching control section and display shown in FIG. 1. FIG. 3 is a diagram showing details of the device and switch control section, FIG. 3 is a diagram showing details of the temperature correction circuit shown in FIG. 1, and FIG. 4 is a diagram showing the relationship between sensor temperature and outside temperature. , and FIGS. 5A to 5D are diagrams showing display states that change according to switch operations. b... Display device, 11... Temperature sensor, 12...
...A/D conversion circuit, 13...Temperature correction circuit.

Claims (1)

[Scope of Claims] 1. A temperature sensor that detects temperature built into a case body worn on a human body, a conversion means that converts the temperature detected by this temperature sensor into digital detected temperature data T _A , and this conversion. The detected temperature data obtained by the means
From T _A , T _B = AT _A + B [where A is the temperature coefficient and B is the outside temperature O
This is the initial value at °C. ] A corrected temperature data calculation means for obtaining corrected temperature data T _B using the formula; and a display means for displaying the corrected temperature data T _B obtained by the corrected temperature data calculation means, and the corrected temperature data calculation means The means includes a setting means for setting accurate external temperature data, and a setting means for setting the temperature coefficient A based on the external temperature data set by the setting means and the detected temperature data obtained by the converting means at the time of setting the external temperature data. and calculation means for calculating the initial value B; storage means for storing the temperature coefficient A and the initial value B calculated by the calculation means; and the storage means stores the temperature coefficient A and the initial value B. After that, the detected temperature data T _A obtained by the conversion means is corrected using the temperature coefficient A and the initial value B according to the equation to obtain corrected temperature data.
An electronic temperature measuring device comprising: means for obtaining T _B ;