JPS5999319A - Electronic temperature measuring device - Google Patents

Abstract

PURPOSE:To measure and display a free air temperature accurately even though the effect of a bodily temperature is received at the time of carrying, by performing correction based on the accurate free air temperature which is set from the outside and a sensor temperature which is set at the time of free air temperature setting. CONSTITUTION:A switch part 7 is provided at the outside of a wrist watch and comprises the following parts: a switch S1 which measures a temperature and performs release; a switch S2 for switching a free air temperature setting mode, a temperature measuring mode, and a watch mode; and switches 3 and 4 which increment or decrement the preset temperature by every 1 deg.C. The switch S3 or S4 is operated and the accurate free air temperature is set in a termperature correcting circuit 13. The temperature of a sensor 11 is subject to the effect of the bodily temperature. When the free air temperature is 37 deg.C, the sensor temperature agrees with 37 deg.C. The temperature correcting circuit 13 obtains a coefficient A and a content B by simultaneous equations of TC= ATA+B, and performs the temperature correction in accordance with the equations. The corrected temperature is sent to a display device 6 through a switching control part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic temperature measuring device that digitally converts and displays the 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 kind of electronic watch is
Since the temperature sensor is directly sensitive to temperature, K can accurately measure and display the outside temperature when the watch is not being carried.However, when the watch is being carried (when it is worn on the wrist),
Due to the influence of body temperature), the temperature sensitive to temperature of 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 outputted from the oscillation circuit 2 constituting the clock circuit 1 is frequency-divided into 1 second digits (lIh signal) by the frequency dividing circuit 3, and sent to the counter circuit 4 for counting. Jin's counting circuit 4
is the time information of hours, minutes, and seconds based on the 1 second digit,
The day of the week information and date information of the month and day are counted and output and sent to the display device 6 via the display switching control section 5.

Further, the switch section 7 is provided with manual switches S8 to S4 provided outside the timepiece, and has an ifC configuration. In this case, the switch S1 is a switch for measuring and canceling the temperature at that time when it is operated;
Switch s2 is a mode changeover switch that switches between external temperature setting mode, temperature measurement mode, and clock mode. The switch S is a +1 switch that increases the set temperature by +1°C each time it is operated, and the switch S4 increases the set temperature by 1°C each time it is operated. It is a switch that decreases the temperature by ℃. Therefore, the output of each of these switches 81 to S4 is as follows.
The signals are respectively applied to the switch control section 8 .

The switch control section 8I/'i outputs various control signals according to the output of the switch section 7, and the display switching control section 5
A display switching command is output to the temperature measuring device 9, and signals a% b, c, and d are output to the temperature measuring device 9. The signal d is the or-dirt 1 to which the IP (pulse)/IMC signal output from the counting circuit 4 is input.
given to 0.

The output of the ORADART 10 is an A/D converter that converts the temperature detected by the temperature sensor 111 into a digital value.
This is an operation command that is given to the D (analog/digital) conversion circuit 12 and the temperature correction circuit 13 that corrects the temperature converted by the A/D conversion circuit 12 based on the influence of the human body, and operates each circuit. Moreover, the signals a1b and c are
A signal given to the temperature correction circuit 13, and a signal a
1b is a signal for setting an accurate external temperature in the temperature correction circuit 13, and signal C 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. In this case, the temperature read into the latch 14 is referred to as an uncorrected temperature, and the temperature read into the latch 15 is referred to as an uncorrected 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 unit 5 and the switch unit 8 will be explained with reference to FIG. When the switch control unit 8 is given the operation signals of the corresponding switches S1 to S4, A? One-shot circuit 1 that outputs each Luz Tsukuda number
6 to 19 are provided. The noggle signal output from the one-point yacht circuit 16 is given to the trigger clip 70 tube (T-FF) 2(1) T input terminal,
Inverts its output state. The Q and Q outputs of this T-FF 20 are given to a decoder 21, respectively. Further, a pulse signal outputted from the one-shot circuit 17 is applied to the ternary counter 22, and increments its contents by +1. Each time the output pulse of the one-shot circuit 17 is applied, the ternary counter 22 changes its contents to "0", "l", "
2", rCIJ,----..., and the contents "O", "l", and "2" correspond to the clock mode, temperature measurement mode, and external temperature setting mode, respectively. , and each pit output is given to a decoder 21, respectively. Furthermore, the output from the one-shot circuit 18.19 is /? The pulse signals are respectively applied to decoders 21.

The lever j"21 is connected to the line t according to the combination of input signals.
, ~112 send out decoded outputs.

The decoded output from line t8 is one-shot circuit 2.
3 and outputs the signal @d. Lines t2 to t9
The decoded output from is a display switching command output to the display switching command 1 section 5.

The decode output from line AI, -t12 is
Signals a1b, c output to temperature control device 9
It is.

The display switching control vA5 includes a dart circuit 24 to which date information, day of the week information, and time information are correspondingly inputted from the counting circuit 4.
26, a dart circuit 27 to which set temperature data is input from the temperature correction circuit 13, a dart circuit 28, 29 to which correction temperature data is input from the latch 15,
Dart circuit 30 to which uncorrected temperature data is input from 4.
．． 31. And dirt circuit 24y31
are controlled to open and close according to display commands output from lines t and t9 of the switch control section 8.

Thus, the output contents of each f-) circuit 24 to 31 are sent to the display device 6.

The display device 6 includes a first numeric display section 32 that digitally displays time information and set temperature in the lower section, and a character display section 33 that displays day of the week information and display mode information in alphabetical characters and a date in the middle section. A second numerical display section 34 that digitally displays measured temperature information (uncorrected temperature information or corrected multi-temperature information), and an analog display that displays measured temperature information (uncorrected temperature information or corrected 1 temperature information) It has a configuration including an analog display section 35 that displays. in this case,
The analog display section 35 includes, for example, 40
The temperature of 1° C. to 40° C. is displayed in units of 1° with each display element. Thus, the output contents of the dart circuits 24, 29, and 30 are sent to the second numerical display section 34 for switching display. Further, the output contents of the gate circuit 25 are sent to the character display section 33 and displayed.゛Also, dirt circuit 26.
The output contents of 27 are sent to the first numerical display section 32 and displayed in a switched manner. Further, the output contents of the dirt circuits 28 and 31 are sent to the analog display section 35 and displayed by switching.

Next, details of the temperature correction circuit 1113 will be explained with reference to FIG. The temperature correction circuit Flf5'13 is provided with an arithmetic circuit 37 into which the temperature information changed by the A/D conversion circuit 12 is inputted via the lunch 36.

Based on the following formula, the A/D conversion circuit 1
The temperature converted in step 2 is corrected.

Th...Outside temperature, TB...Temperature detected by the sensor when carrying the watch, A...--order coefficient, B...
. . . The constant, that is, the relationship between the temperature detected by the temperature sensor 11 (sensor temperature) and the outside temperature is as shown in FIG. Here, when the watch is not carried, when the watch is removed from the wrist, as shown in the person in Figure 4,
The sensor temperature is proportional to the outside temperature and changes isometrically. In addition, when wearing a mask, it is influenced by the user's body temperature and how it is worn, 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 increases as the outside temperature rises from an initial value of 20°C or higher; This is a case where the influence of body temperature is greater than the change in C, and the initial value is also larger than that of the change in C. In this way, there is some fluctuation in the first-order coefficient a1 constant depending on the influence of body temperature,
When the outside temperature is 37℃, the changes in sensor temperature A, B, and C are as follows.
They will match each other. Therefore, at a certain level of outside air temperature, the difference between the accurate temperature measured by a thermometer and the sensor temperature at that time when the watch is carried can be determined by calculating the linear coefficient A1 constant B depending on the user. . Therefore, the arithmetic circuit 37 calculates the -th coefficient A1 constant B
After finding Tc2ATA+13 simultaneous quadratic equations, TA=ffj! Temperature correction is performed according to the equation =L-. Furthermore, the arithmetic circuit 37 has various registers such as an X register for display and a Y register for arithmetic operations, and a predetermined register stores in advance the matching temperature of 37°C based on FIG. has been done. Then, the arithmetic circuit 37 uses the arithmetic command C expressed by the above formula based on the input output of the OR gate 10, and calculates A, B based on the contents of the up/down counter 39 input via the dart circuit 38.
Execute the calculation operation to find. Therefore, the arithmetic circuit 37
The calculated values of A and B are sent to the A register 42 and the B register 43 via the dart circuits 40 and 41 which are opened by the signal C.
Also, the contents of the A register 42 and B register 43 are transferred to the r-) circuit 4 which is opened by the output of the orderer) 10.
4.45. The up/down counter 39 increments its contents by +1 each time the signal a is applied to its ten input terminals, and its -
Each time a signal is applied to the input terminal, its contents are decremented by -1, and an accurate external temperature is set, and the set temperature is sent from the temperature correction circuit 13 and sent to the display switching control section 5.

Further, the temperature corrected by the arithmetic circuit 37 is sent to the latch 15.

Next, the operation of the electronic wristwatch with a temperature measuring device configured as described above will be sequentially explained according to the display state shown in FIG. First, when the content of the ternary counter 22 of the switch control unit 8 is set to "0", that is, the clock mode is set, and the Q output of the T-FF 20 is the logical value "11", the line of the decoder 21 is 12, As, 14,
A signal with a logical value "l#" is output from ta, and the dart circuits 24, 25, 26, and 28 of the display switching control section 5 are opened, respectively.As a result, the date information output from the dart circuit 24 is changed to the second numerical value. In addition, the day of the week information output from the dart circuit 25 is sent to the character display section 33, and the time information output from the dart circuit 26 is sent to the first numerical display section 32. , dirt circuit 2
The corrected foot temperature information output from 8 is displayed on the analog display section 3.
Sent to 5. As a result, the display content on the display device 6 becomes as shown in FIG. 5(A). In this case, the temperature displayed on the analog display section 35 is changed every minute. That is, the IP/IM signal output from the counting circuit 4 automatically activates the temperature sensor 11. The A/D conversion circuit 12 and the temperature correction circuit 13 each operate at one-minute intervals, and after the temperature detected by the temperature sensor 11 is converted into a digital value by the A/D conversion circuit 12, the temperature correction circuit 13 operates. TA-i 17”
The desired correction formula is applied, and this corrected temperature is displayed on the analog display section 3 via the latch 15 and the display switching control section 5.
5, the temperature automatically measured at one-minute intervals is corrected and displayed on the analog display section 35.

Next, in the clock mode, when the switch S is operated once, the output state of the T-FF 20 is inverted by the Norse signal outputted from the one-shot circuit 16, and its Q output becomes the logical value "'1#". Line '1 of decoder 21
, Lm % 14.16 , a signal with a logical value of "1" is output from the terminal. As a result, one-shot circuit 2
The pulse signal dK output from the temperature sensor IL
Since the A/D conversion circuit 12 and the temperature correction circuit 13 are each operated, when the switch S1 is operated, the temperature at that point in time is measured. In other words, if one switch S8 is operated while temperature measurement is being performed automatically at 1-minute intervals, the temperature at that point will be measured, and manual temperature measurement can be performed against the automatic temperature measurement pressure. becomes.

Therefore, lines t3.14.18, t, of the decoder 21
When a signal with a logical value "'1#" is output from the switch S, the dart circuits 25, 26, 28, and 29 of the display switching control section 5 are opened.
The temperature measured at the time of operation 1 is corrected by the temperature correction circuit 13, and this corrected temperature is switched and displayed with the date information as shown in FIG. 5(B)K. In this display state, when the switch s1 is pressed one more time, the output state of the T-FF 20 is reversed and the calculated output becomes the logical value 11m again, so that the state shown in FIG. 5(A) is returned. Become.

Next, in the display state of FIG. 5(A), the switch S,
When is activated once, the content of the ternary counter 22 is incremented to "1" by the noyarusu tsukuji code outputted from the one-shot circuit 17, and the temperature measurement mode is set. In this temperature measurement mode, line '4 of the decoder 21
, Z g , and Z 9 output signals with a logical value of 11#, and the dirt circuits 26, 30, and 31 of the display switching control section 5 are opened.

As a result, as shown in FIG. 5(C), in addition to the time information being displayed on the first numerical display section 32, the uncorrected temperature output from the dirt circuit 30 is displayed on the second numerical display section 34. , and the uncorrected temperature output from the r-) circuit 31 is displayed on the analog display section 35.

In this temperature measurement mode, when the switch S2 is further activated once, the content of the ternary counter 22 is incremented to "2" and the external temperature setting mode is set. In this setting mode, line 1 of decoder 21
8%'l, '0 to logical value'''1# signal;
The dart circuits 27, 30 . of the display switching control section 5 are output.
31 will be opened.

As a result, the set temperature output from the dirt circuit 27 is switched and displayed on the first numerical display section 32. In this case, initially, the contents of the up/down counter 39 are "0", so the set temperature to be displayed is "0". Then,
To set the up/down counter 39 to a set temperature, for example, an accurate outside temperature measured with a thermometer, switch S is used.

Alternatively, this can be done by operating switch S4.

For example, if the outside temperature is to be set to 20° C., switch S is operated 2θ times. As a result, the pulse signal output from the one-shot circuit 18 is applied to the decoder 21, so that the line /-
From to, it is output as (il'j"Pi' a) and is input to the ten input terminal of the up/down counter 39. Therefore, the up/down counter 39 has switches S,
A value corresponding to the number of operations is set, as shown in FIG. 5(D). In this case, the mode display rSE-J is displayed on the character display section 33, and it is clearly indicated that the content displayed on the first numerical display section 32 is the set temperature. In addition, in the external temperature setting mode, when the switch s4 is operated, the pulse signal output from the one-shot circuit 19 is output as a signal 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. In the external temperature setting mode, the uncorrected temperature output from the dart circuit 30. , are displayed in analog form on the analog display section 35.

In this manner, when the accurate setting of the external temperature is completed, the switches S8 and S4 are simultaneously operated 1c. As a result, the calculation circuit 37 of the temperature correction circuit 13 executes calculation according to the following equation and calculates the value of AlB.

Now, 20 degrees Celsius is set as the accurate value of the outside air temperature, and the temperature detected by the temperature sensor 11 (temperature without correction) at this time is 3
Since the temperature is 1℃, 31=2OA+B・Old・・・・・・・・・(1)37=3
7A+B・Old・・・・・・(2) No. 2, (
2) Calculate equation - (1), 6:17A ・'-A
=0.353 This person's value Equation (2) Substitute K and get B=37-13.059 ・-B=23.9
4 is required.

The values of A and IB 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 transferred to the arithmetic circuit 37 every time the output of the A/G 10 is given, and the arithmetic circuit 37 converts the contents of the A/D conversion circuit sent from the latch 36. Based on the contents of 12 (sensor temperature), calculate: The temperature corrected in this way becomes an accurate outside temperature that is not affected by body temperature.

Note that this invention is not limited to the above embodiments, and can be modified and applied in various ways without departing from the scope of this invention.
For example, A and B of TB:ATA+B may be calculated using the least squares method from accurate external temperatures and sensor temperatures at multiple points. Without determining the value of A%B, the sensor temperature can be directly increased, and A, proportionally based on the accurate external temperature preset at the time of temperature measurement and the sensor temperature detected at the time of setting the external temperature of the heat sink. The value of B may also be determined.

In addition, although the above embodiments show the case where the present invention is incorporated into an electronic wristwatch, the present invention is not limited to an electronic wristwatch as long as it is a non-portable electronic device.

Furthermore, in the above embodiment, the outside air temperature was 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 temperature detected by the temperature sensor 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. In other words, in the case of a wristwatch, the effect of body temperature will vary depending on the way it is worn on the wrist. It has the excellent effect of preventing the effects of body temperature.

[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. Figure 3 is a detailed diagram of the device and switch control section, Figure 3 is a detailed diagram of the temperature correction circuit shown in Figure 1, and Figure 4 is a diagram showing the relationship between sensor temperature and outside temperature. Figure, Figure 5 (A)
FIGS. 7A to 6D 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. Patent applicant Casio Computer Co., Ltd. Figure 5 (B) - Example

Claims (1)

[Claims] temperature detection means for detecting temperature; setting means for setting accurate external temperature data from the outside; Electronic temperature measurement characterized by comprising a correction means for correcting the detected temperature data detected by the temperature detection means based on the data, and a display means for displaying the corrected temperature data obtained by the correction means. Device.