JPS6189530A - Temperature measuring device - Google Patents

Abstract

PURPOSE:To simplify not only circuit constitution but also operation, by a method wherein lately and preceding measured results are held and the start and stop of measuring operation are performed by single operation to enable the change-over display of the lately and preceding measured results while a max. measured value and the preceding result are alternately displayed. CONSTITUTION:The closed state of a switch 1 is detected by a counter 4 and a latch circuit 5 and a GRST signal is sent to a temp. measuring part 10 through a counter 7. When the present measured temp. value measured in the timing from a counter 8 is larger than the hold value of a memory part 11, said present measured temp. value is written while the hold value of the memory part 11 immediately before resetting is written in a memory part 12 to hold the data of the memory parts 11, 12 even after a power source is cut off. The data of the memory parts 11, 12 are selected by a multiplexer 13 to be displayed on a display device 15 and, when the measured temp. value of the temp. measuring part 10 reaches the max. value, the outputs of the memory parts 11, 12 are alternately displayed by the multiplexer 13.

Description

[Detailed Description of the Invention] [Use in acrobatics] This invention relates to a thermometer, a temperature measuring device for maintenance, and is useful for checking the previous temperature measurement even when the temperature measurement is in progress. Tj who suffered a defeat that confirmed the result of
(Regarding the pre-prepared temperature measuring device.

[One conventional method] Electronic crystallinity measuring instruments have been adopted in many packaging products in recent years,
! For samurai and for household use, water lizard body up to L is 6" 1h.
Instead of a meter, it is rapidly becoming popular due to its ease of use.

However, if the mercury body temperature j゛ is kept in the frozen state after defecation, the measurement results obtained during the previous temperature a; In contrast, the conventional temperature measuring device mentioned above
The system only immediately displays the first measurement obtained during operation, but it does not provide enough information to confirm the previous measurement results. In order to know, K needs at least the previous measurement result, so when using the above temperature measuring device, the user should write down or write down the previous measurement result. (It was necessary and very inconvenient.

In order to solve this problem, an electronic temperature measuring instrument was proposed that has a memory function that retains the measurement results even after the power is turned off, and allows them to be read out and displayed as necessary. Company Electronics Digest, December 1, 1975, 1'-CMO8IC Handbook, pp. 287-293).

[Problems that the invention attempts to solve]

What is the above proposed prior art? 1111 In addition to the switch for starting the constant operation, a dedicated switch is provided for reading the measurement results from the boiling section, making the circuit configuration complicated and disrupting the entire device. The device is large in size, and two switches must be operated separately, making the operation complicated and easy to operate incorrectly, making it particularly unsuitable for home use, which is mainly used by AT1 girls.

[Means to resolve the problem]

This invention was made in consideration of the above circumstances, and includes a first storage section that holds the current measurement result during temperature measurement operation, and a storage section of the conduit 2 that holds the previous measurement result. When it is determined that the temperature measurement operation starts and stops with a single switch operation and reaches the maximum value, this maximum value and the previous measurement result are displayed alternately. In addition to simplifying the circuit configuration and reducing the overall size of the device, it also simplifies operation and allows easy comparison of current measurement results and previous measurement results. It is designed to be easy to handle.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a simple embodiment of the temperature ψ;
4 is a counter, 5 and 6 are RS type latch circuits, 7 and 8 are counters, 9 is a control unit, 10 is a temperature measuring box, 11 and 12 are units, 13 is a multiplexer, 14 is a display decoder,
15 is the display, 16 is the R8J latte circuit, 17.18
19 is a falling edge detection section, 19 is a notification signal generation section, and 20 is a notification signal capital.

21 is a transistor, 22 is an alarm, 23 is a counter,
24-27 is Nando Game), 286'! Noah circuit, 29
35 is an inverter.

In the figure, oscillator 3. Counter 3, 4, 7゜8
．． 23. Latch circuits 5, 6, 16. Control unit 9° Temperature measurement unit 102 Display decoder 14. Falling edge detection section 17,1
8. The notification signal generators 19 are in a reset state when the signal supplied to each reset terminal is H'' (still level).

The switch 1 is a normally open switch that can be operated from the outside, such as a bush switch, a slide switch, or a reed switch provided inside the main body case (not shown) that is operated from the outside using a magnet. Positive 't U! , VI, I) is connected in series with a resistor between the power supply terminal and the ground terminal. The connection point between this resistor and the switch 1 is connected to the reset terminal of the counter 4 and the latch circuit 5 and to the Nant gate 24.

Switch 1'/J'' - when not operated (i.e.

(when in the open state), these K "1-1" signals are supplied.

The oscillator 2 is a C2 oscillator, a crystal oscillator, or the like, and generates a reference clock MCK. This block and quasi-clock M
CK is divided into a predetermined frequency by a counter 3, ft, and supplied to counters 4 and 8 and a display decoder 14 as a clock. Further, a predetermined count value of the number of bales of the counter 3 is supplied to the notification signal generation fib 19 K. The oscillator 2 and the counter 3 convert the output of the NAND gate 24 into the inverter 2.
The MCK ON signal obtained by inversion at 9 is used to switch between an operating state (reset release state) and a non-operating state (reset state).

The counter 4 and the latte circuit 5 form a 2t'll constant section 44 for determining whether the switch 1 has been operated (that is, whether the switch 1 is in the closed position). This counter 4
counts the clock from counter 3 when switch 1 is operated to release the reset. When counter 4 counts the first +1, its Q output is “L” (
low level) to “H”, and from then on, counter 4 is n
Each time you count.

Its Q output is inverted.

On the other hand, the launch circuit 5 is set at the rising edge of the Q output of the counter 4 after the reset is released, and the Q output is set at the rising edge of the Q output of the counter 4.
'L' unless reset from Hw to 1L1
is maintained.

The counter 4 and the latch circuit 5 are in the reset state when the switch 1 is open, are in the reset release state when the switch 1 is closed, and are in the closed state when the switch 1 is operated.
The Q output of the latch circuit 5 is from “H” to “LM” (Jy:,
Turn around. Therefore, this Q output is 7H′ force・
The switch 1 is reversed to 1L'', indicating that the switch 1 has been operated.

The counter 7 is a 1-bit binary counter that counts by one at the falling edge of the Q output of the latch circuit 5, and inverts the Q output each time it counts. This Q output is reversed by the inverter 30. A GR8T signal is formed. This Ga5T number is a latch circuit 6. Counter 8. Control unit 9. Temperature measuring section 10° display decoder 14. The reset terminal RK of each of the latch circuit 16 and the falling edge detection section 17 is supplied, and the Nant gate 24. Noah circuit a.

Falling edge detection section 18. Then, it is inverted at the impark 31 and supplied to the Nando game (Nando game) 27.

Counter 8 further divides the clock from counter 3. Is the Qz output of that predetermined frequency division ratio controlled? 111 section 9, and controls the temperature 6111 constant of the temperature measuring section 10, that is, the timing of the side temperature. The 9m output with a frequency division ratio of twice the Qt ratio output is supplied as the latch circuit 16VC set input.

After the reset is released, the latch circuit 16 outputs 9m of the counter 8.
It is set on the rising edge of the output, and its Q output is ")i
The falling edge of the Q output of the latte circuit 16 is detected by the falling edge detection section 17, and the falling edge is displayed. A signal MAX-R1 is formed. This MAX-1 signal resets the section 11 consisting of a D-type flip-flop. The Q output of the ratte circuit 16 is also supplied to the Nant gate 27. Ru.

The temperature measuring section 10 starts operating when the reset is released, and measures the temperature once every period of the Qt ratio output of the counter 8.

Each temperature measurement is completed immediately before the rising edge of the Qt ratio output of the counter 8. d4)] Temperature level 0 is 6 obtained by each temperature measurement in synchronization with the rising edge of this Q7 output.
11j temperature value (hereinafter referred to as current d)] temperature value) and the temperature value held in note 1 bad part 11 (・ru011] temperature 11?(), and when the current measured temperature value is large, M A Generates the
Enter the current egg temperature value instead of the value. Therefore, the storage unit 11 retains the largest current temperature measurement value obtained so far after the temperature measurement unit 10 is released from reset. The storage units 11 and 12 retain data even after the power is turned off. Therefore, the memory m11 is stored in the temperature measuring section 10.
;Even after stopping, the current maximum temperature value during operation is held until the MAX-R signal is input. 7L0 obtained by inverting the Q output of the falling edge detector 18 using an inverter.
According to the M EΔ・10・φ16゛ issue, note 1. μ section 11
The temperature value is held at (V).

This convolution 6 of the measured temperature value is performed immediately before the τ, 4 section 11 is reset. Therefore, this temperature value is the maximum value obtained from the previous measurement, and this is the result of the MiJ times (:+'4) described above, and is hereinafter referred to as the previous temperature measurement value. The downstream edge detection unit 18 inverts the output of the Nandt gate 24 with an inverter 29 to obtain M.
From the CK/ON issue VC, it is switched to υcent, . "H" represents the falling edge of E force.
Outputs the l signal.

This "Hl" signal is inverted by the inverter 34 and the MBM
An O·φ signal is formed.

The multiplexer 13 is controlled by the SA signal eζ obtained by inverting the output of the Nant gate 26 with an inverter 33, selects the temperature measurement value from either one of the recording sections 11 and 12, and sends the selected temperature value to the display decoder 14Vc. Here, when the multiplexer 13 is the SA multiplied signal H1, the multiplexer 13
2 is selected, and when SA1 is L'', the temperature measurement value from the storage unit 11 is selected.

The display decoder 14 and the display 15 constitute a display section. The display decoder 14 does not send any signal to the display 15 at the time of reset, and therefore the display 15 is in a blank display state in which nothing is displayed. G) (When the ST signal becomes "L7" and the reset is released, the 1 display decoder 14 outputs the output of the multiplexer 13 as long as the DisPR signal obtained by inverting the output of the Nant gate 27 with the inverter 32 is "L". is decoded and the above display is made on the display 15. However, when the DisPR signal becomes "Hl", it is preset to prohibit reception of the output of the multiplexer 13 and cause the display 15 to light all its segments. supply the signal.

Although not shown, the display decoder 14 is provided with an out-of-measurement-range detection means, and if the temperature measurement value selected and supplied by the multiplexer 13 is outside the predetermined range σ(1j), the display decoder 14 In order to display this fact, instead of the measured temperature value, data representing a 1 ml standard, a symbol, a pattern, etc. is supplied to the display 15.

Here, the predetermined measurement axis times are 32.08C to 42.0C.
"C. If the multiplexer 13 selects the previous temperature measurement value from the storage unit 12 and this is less than 32.0°C, the display 15 will display the value 1'-32, 0°C."
is displayed, and when the temperature exceeds 42.0℃, 1 display 11η
When "r42.0°C" is displayed, the display decoder 14 sends data to the display 15 by the above measurement range detection means. In addition, when the multiplexer 13 selects the current temperature value from the storage unit 11 (strictly speaking, the largest value among the current temperature values obtained after the operation of the temperature measurement unit 10; the same applies hereinafter), this When the temperature is less than 32゜0℃, the displayed value “LO℃
” exceeds 42.0℃, K is 1 display value rHI'CJ
The display decoder 14 controls the display 1 so that
Send data to 5. In this way, the previous Jli1 temperature value outside the predetermined measurement range and the record 1. In order to make the displayed value different from the current value from the unit 11, the above-mentioned measurement range detection means is also controlled by the SA multiplication signal. .

The notification signal generating section 19 is a decoder, and when a predetermined range of count flags are supplied from the counter 3.

A notification signal CK of "Hl" is generated during the supply period. Assuming that the counting operation period of the counter 3 is a period during which the counter 3 counts from the count value 0 to the maximum count value, the above-mentioned predetermined range is α (however, α= 1.2,3....)1
If a fixed location is provided, the notification signal CK is generated α times from the notification signal generator 19 during this counting operation cycle. In this embodiment, as is clear from FIG.
Notification signal CK is provided three times per the above counting operation cycle.
It is assumed that this will occur. It goes without saying that the period of the clock supplied from the counter 3 to the counters 4, 8 and the display decoder 14 is sufficiently shorter than the above-mentioned counting operation period aJJ. As is clear from the above, the counting operation period is set to 1/2 of the Ql ratio output period of the counter 8.

The notification signal generator 19 also generates the notification signal CK,
When both the Q output of the latch circuit 6 and the Ql ratio output of the counter 8 are K "H", it passes through the Nantes gate 25, is inverted by the inverter 36, and is supplied to the notification section 20 as the "H" notification signal DR. .

The alarm unit 20 is constructed by connecting an alarm 22 and a transistor 21 in series between a terminal to which positive voltage vILD is applied and a ground terminal. Notification fI and number i are supplied.

(The M A
5 and is inverted and supplied to the reset terminal of the counter 23. Counter 23 uses Ql of counter 8 as a clock.
A specific power is supplied, and it counts by one at this Qt high power falling edge. The counter 23 is set to a predetermined number (12 in this case).
), the Q-output changes from “L” to “
It is inverted to Ho, and the launch circuit 6 is set at the rising edge of this Qn output.

Here, when the GST signal is "L", the counter 23 is released from reset and counts by one for each falling edge of the Ql ratio output of the counter 8, or the temperature measuring section 10 is When the MAX•φ signal of “H” is generated, the counter 23 is reset by this MAX•φ signal. Therefore, during a period in which the current temperature information obtained by the vortex section 10 is larger than the temperature value stored in the storage section 11, the temperature measurement section 10 detects 84-A X at every rising edge of the Q7 output of the counter 8. Since the -φ signal is generated, the counter 23 repeats one count at the falling edge of the QtjB force of the counter 8 and reset at the rising edge, and the count value of the counter 23 does not increase and the latch circuit 6
is not +7 sesoto. For this fLK, after the north temperature of temperature measuring section 10 reaches the maximum weight of 16, 611j temperature section 10
Since the counter 23 does not generate the MAX-φ signal, the counter 23 is not reset, and when the count value reaches 12, the launch circuit 6 is sectored.

The Q output of the launch circuit 6 and the Qt high output of the counter 8 are supplied to the Nandt gate 26, and the output is supplied to the inverter 3.
The signal is inverted at 3 and becomes the SA multiplied signal.

Therefore, when the latch circuit 6 is not set and its Q1 output is L", the SA multiplied signal is L", and the multiplexer 13 is set as described in 1. selects the temperature measurement value from section 11, but when the latch circuit 6 is set and the Q output of section 7 becomes 1) v, the QJ high output wHn of the SA double signal counter 8, *L
The multiplexer 13 alternately selects the temperature value from the storage section 11 and the temperature measurement value from the storage section 12.

Next, the operation of this embodiment will be explained using the timing chart of FIG.

Regarding FIG. 2(a), in the non-use state, the temperature measurement value Nx' from the previous time is stored in the storage unit 11VC as described above, regardless of input or aiyrVc (not shown). 11 times σ (11 temperature values N , normally the power is turned on and the display section 15 is in an operating state.Also, at this time, the counter 7 is ready to be reset, but its Q output is "Ll" and the display section 15 is in an operating state.
The signal is "H1". Also, since the switch 1 is in an open state and the counter 4 and latch circuit 5 are in a reset state, the Q output of the latch circuit 5 is "H".

Therefore, since the single power of the Nant gate 24 is both VC "H", the MCK-ON signal is "Hl", and the oscillator 2
．． Counter 3. The falling edge detection section 18 and the notification signal generation section 19 are in the reset state and image.

Also, since the GRS 'f' signal is "H", the latch circuit 6. Counter 8. Control unit 9. Temperature measurement unit 109 display decoder 14. The latch circuit 16 and falling edge detection section 17 are also in a reset state, and the display 15 displays a blank display. Furthermore, since the Q output of the latch circuit 16 in GR8T (word "Hol" and in the reset state) is also lHI', the DisP signal obtained from the inverter 32 is "L". Although the circuit 6 is in the reset state, its Q output is 1L" and is the SA multiplied signal L". value Nx') is selected.

The above is the state of each part when not in use.

In this state, switch 1 is operated to close jBK.
Then 1. Since the input of switch 1 &li of Nante gate 24 becomes "L", 1CK-ON to 1CK-ON (≦ sign is "L"
As a result, the oscillator 2. Counter 3. Falling edge detection section 1
8 and the notification signal generator 19 are reset. For this purpose, the oscillator 2 generates a reference clock MCK, which is divided by the counter 3.
ub 19 generates a broadcast signal CK.

At the same time as the dust is removed, the counter 4 and the latch circuit 5 are also reset, and the counter 4 counts the clock from the counter 3. When the counter 4 counts n, its Q output is inverted from "L" to sH*K, and the latch circuit 5 is set at its rising edge.

For this reason, the Q output of the latch circuit 5 changes from 1H'' to 5L''.
The counter 7 counts by 1 at the falling edge. By this count, the Q output of counter 7 is inverted from "L" to "H", and the GR8T signal is changed from "IIHI" to "H".
Along with this, the output of the latte circuit 6. counter 8. control unit 9. temperature measurement unit 10° display decoder 14.
Latch circuit 16. The falling edge detection unit 17 is released from reset and becomes active, and the counter 8 starts counting the clock from the counter 3. Also, (jR8T signal is sent to the counter 23 via the NOR circuit 28 and the inverter 35.
, the counter 23 is also reset.

Furthermore, the falling edge of the GR8T signal from "L" to "L" is detected by the falling edge detection section 18, and the ILI MEMO/φ signal representing this falling edge is supplied to the storage section 12. , in the storage unit 12, instead of the previous temperature measurement value N, which has been held up to now, the storage unit 11
The previous temperature measurement value N x ' from is stored.

Furthermore, since the latch circuit 6)) has been reset but not set, its Q output +s is "L" and the SA double signal remains "L", and ■Lunaplexer 1
3 is 1. The previous side temperature 1 straight Nx' from the μ section 11 is selected. On the other hand, the display decoder 14 has been released from reset as described above, but G) 1. ST double signal I
Q of the latte circuit 16 becomes LI and is not set.
Since the output remains "H", the output of the Nantes gate 27 changes from 1H" to II L 11, therefore 1) is
The PR signal is inverted from 1L'' to 1H'' and the display decoder 1
4 is preset. For this.

Display decoder 14 does not accept the output signal of multiplexer 13, but instead lights up all segments of display 15.

Furthermore, since the Q output of the latch circuit 6 is "L", the notification signal CK from the notification signal generating section 19 does not pass through the Nantes gate 25, and the notification section 20 is not supplied with the notification signal.

This state continues even after the switch 1 has been operated and is in the open state. This means that when switch l is open,
The counter 4 and the latch circuit 5 are reset, and the Q output cover of the latch circuit 5 is inverted from lL'' to IIHI, but the counter 7 is not affected by this and therefore the G
This is because the ST signal is kept as it is at 'L'K, and therefore the MCK-ON signal obtained from the inverter 29 is kept as it is at 1Ll'.

Meanwhile, the counter 8 continues to count, and when it has counted a predetermined number l, the Qj ratio output is inverted to "L" or "L". The rising edge of this Qz output is detected by the control section 9, but no signal is sent to the control section 9G and the temperature measuring section 1°. Furthermore, counter 8! When the count value reaches 21, the Ql output is inverted from low to low, and the counter counts by 1 and the count value becomes 1. At the same time, the Q-output of counter 8 is inverted from L8 to "L". At the rising edge of this Qm output, latch circuit 1
6 is set, and its Q output is inverted from 5H'' to 'L''. The falling edge of this Q output is detected by the falling edge detection section 17 to form a M.sub.AX-- signal, thereby resetting the storage section 11. As a result, note 2
In Hbxx, the previous temperature measurement 1 (ηNx' is deleted and the value O
is retained.

Also, as the Q output of the latch circuit 16 becomes L'', the DisPR47 from the inverter 32 is inverted from 1H1 to 1L7, the display decoder 14 is released from presect, and does not receive the output signal of the multiplexer 13. At this point, the S large signal &'! is “L”, so the multiplexer 13 outputs the temperature measurement value from the storage unit 11.
has been selected, and since this temperature value aO is selected, the display decoder 14's fixed range detection means detects the
The display value “LO°C” is displayed. Meanwhile, the counter 8 continues counting, and when the count value reaches 3), the Q! The small output 1L" is reversed to "L", and the control module iS9 detects this reversal and sends a signal to the temperature measuring section 10.

On the other hand, the temperature measuring section 10 completes the first temperature measurement immediately before the rising edge of the Ql output of the counter 8, and
When receiving a signal from the IJ control section 9, the side temperature value is read out from the storage section 11 and compared with the current temperature measurement value N1 obtained by the first temperature measurement. In this case, the read temperature value is 0
Since the measured temperature value N1 is larger, the temperature measuring section 10 generates the 1ttt A
Vc feed, current temperature measurement value N.

is stored in the storage section 11. As a result, the display 15 shows
The displayed value "r'r, ℃" corresponding to the current molten metal level N, K is displayed.

At the same time, this MAX11φ signal is sent to the NOR circuit 28,
The reset terminal i of the counter 23 via the inverter 35
t is supplied. As a result, the counter 23 is reset and its count value becomes O.

Furthermore, when the counter 8 counts l times and the count value reaches 47, the Q! The specific output is inverted from 1H'' to L'', and the counter 23 counts by 1, and the count value becomes 1.

Furthermore, when the counter 8 counts by l and the count value reaches 51, the Ql output Gx'L'' is reversed to H7, and at the rising edge of this Qt ratio output, the temperature measuring section 10 detects the current value obtained just before. Compare the measured temperature value N1 with the measured temperature value N1 stored in the i For this reason, the display 15 displays this current temperature value N.
, A display value rTt'cJ corresponding to K is displayed. Also,
The counter 23 is reset by the MAX·φ signal generated at this time.

In this way, at the rising edge of the Qz ratio output every time the counter 8 counts 21, the temperature measurement section 10 compares the current temperature measurement value with the temperature measurement value held in the storage section 11, and calculates the current temperature measurement value. When the value is large, the temperature value in the first part 11 is close to this current temperature measurement value. Therefore, the storage unit 11 retains the largest temperature value among the temperature measurements taken so far after the reset, and the temperature measurement value is the temperature of the object to be measured (for example, body temperature).
In the period when the temperature does not reach the temperature, the storage unit 11 is stored every time the temperature measurement unit 10 measures the temperature.
The temperature value held in is updated, and the display value displayed in S15 is also updated accordingly.

In addition, the counter 23Kl is counted at each falling edge of the Qt ratio output of the counter 8, but during a period in which the temperature measurement values held in the storage unit 11 are sequentially updated, the Qt ratio of the counter 8 is
M generated from the temperature measuring section 10 at every rising edge of l output
The counter 23 is set by the AX·φ signal.

Did you mean this il+? 11' During the update period of the IML value, the counter 23 alternately resets and counts 1, and the count value becomes 1 and does not increase. As a result, since the ratte circuit 6 is not set, the multiplexer 13 continues to select the current measured temperature value from the storage section 11, and the value displayed on the display 15 is updated.

In this way, the temperature measurement section 10 continues to measure the temperature, and if the obtained current temperature N is larger than the temperature measurement value Nx-1 held in the storage section 11, this current measurement The temperature value Nx is loaded into the storage section 11KM, but next, if the temperature value INX+1 obtained by the temperature measurement section 10 is equal to the temperature measurement value NxK held in the storage section 11, the storage section 11VC is stored as it is. The measured temperature value N is held, and the n1ll temperature section 10 is maintained at M A
Does not generate a signal. For this reason, the counter 23 is not reset and the Q! of the counter 8 is not reset. One more count is made at the next falling edge of the specific output. As a result, the counter value of the counter 23 becomes equal to 2.

After that, the temperature on the dust side obtained by the temperature measurement unit 10 is stored in the storage unit 11vc (if it becomes thicker than the 1111τAA Il
? j has become saturated and flat," and the current temperature measurement 11i at this time is
Nx is the maximum value in the current measurement. For example, in the case of body temperature measurement, the fact that the current measured sulfur value reaches saturation equilibrium means that the current measured temperature value represents the target body temperature, and the counter 23 is not reset and the counter 23 is not reset. The value increases by one at each falling edge of the Q7 output of counter 8. Further, on the display 15, a display value "'r,°C" corresponding to the maximum current temperature measurement value N is displayed, and the process continues.

Then, when the counter value of the counter 23 reaches 12, as shown in FIG. The Q output is inverted from "L" to "H". This Q output "■(" state continues until the latch circuit 6 is reset.

When the Q output of the ratte circuit 6 becomes H'', the Nant gate 2
The output of counter 6 is 'L' when the Qt ratio output of counter 8 is "H".
1. When the Qt ratio output of counter 8 is 5L'', it becomes H'',
The SAD signal from the inverter 33 becomes “H” H as the Qt ratio outputs IH# and IILI of the counter 8 change.
It changes to L'. As a result, the multiplexer 13 alternately selects the current temperature measurement value N from the memory 't5b11 and the previous temperature measurement value Nx' from the storage unit 12, and displays the corresponding display values rT,' on the display 14. CJ rT and '6CJ are displayed alternately.

On the other hand, when the Q output of the latch circuit 6 becomes "H".

When the Qt ratio output of the counter 8 is 11H'', the notification signal CK from the notification signal generation section 19 passes through the Nantes gate 25, is inverted by the inverter 36, and is supplied to the transistor 21 of the notification section 20 as the notification signal of wH''. be done. By the way, after the Ql high output l'H1' of the counter 8,
The multiplexer 13 selects the previous temperature measurement value Nx' from the storage unit 12 as the SA multiplied signal wHw, and the display value "Nx1°C" corresponding to this previous temperature measurement value Nx' is displayed on the 1 display 15. , display 1m r Display Ili that is displayed alternately with NX'CJ according to the current temperature measurement information NxK from storage unit ■1
Display period of "Nx7℃".

The notification signal f)R is supplied to the notification section 20, and the @i alarm device n makes a sound.

As a result, it is possible to know through the notification that the humidity to be determined (this is the maximum value of the temperature of the machine, and in the case of a thermometer, is the body temperature), and this temperature and the previous temperature are also known. The temperature By measured during rotation measurement is displayed alternately and clearly distinguishable between the two by notification.

Therefore, it is possible to accurately know the current N11 constant results, and also to accurately grasp the range of temperature changes and the relative softness of the recapture and '++T1 measurement results.

After that, switch 1 is operated and the closed state j6 ((
Counter 4 and latte circuit 5 &24=1) and reset)
As explained earlier, the Q output of the latte circuit 5 &$ is inverted from "H" to IILI and the counter 7)'X
The Q output is inverted from *H'' to "H", and the GRS T signal is inverted from IIJ, l to lHII.

However, since the input hx of the 14-bit switch of the Nant gate 24 is "L", the MCK ON signal is also held as is @LmVC. Therefore, even if the switch 1 is in the open state, the above operation continues.

Q RST signal becomes +H'', so the latte circuit 6. Counter 8, flJIJ control section 9. Measurement section 9A Iku 1
0° display section 14. The latch circuit 1G and the falling edge detection section 17 are reset and become inactive.

The display section 15 is displayed blank. In addition, since the Q output of the ratte circuit 6 becomes 1lLl', the NAND game) 2
5. This causes a blockage and the transmission of the notification signal to the notification section 20 is stopped.

When the switch 1 completes its operation and becomes the closed state IK, the counter 4 and the latch circuit 5 are reset, and the Q of the latch circuit 5 is reset.
The output is inverted from 1L" to Ni. Since there is no shadow on counter 7, GR8TlW remains at 0. And is switch 1 closed? a Since K becomes K, the power of the Nant gate 2402 becomes "llH", and the 1MCK-ON signal is inverted from IJ, 4 to "H", and the oscillator 2, counter 3, falling edge detector 18 and notification signal generator 19 It is reset and becomes inactive.

In this way, all of the circuits become inactive, and the entire device stops operating, but at this point, the falling edge detectors 17 and 18 output the M A
Since the O・φ signal is not generated, the storage unit 11 is not reset, and the maximum current temperature value N obtained by dividing the current measurement is stored.
x, and the storage unit 12 stores the previous temperature measurement 1 shift N x
' holds. This current side temperature value Nx held in the memory Lq section 11 is updated lζ times and stored in the storage section 12, and is used as the temperature 1- after being removed.

In addition, when displaying according to the above-mentioned previous temperature measurement value N x ′, if this previous temperature measurement value N It goes without saying that the display 15 will display "1 m r 32 , 0°C" or "42.0°C" by the measurement outside the measuring range detection means.

Further, as the alarm 22, a buzzer can be used, but it is not limited to this, but a lamp can also be used.The IC memory that stores the melody is driven by the alarm signal DR to extract six melody signals. It may be one that generates a melody by driving a speaker, and any alarm device can be used.

Further, in the above embodiment, the previous temperature measurement value NX/ was written from the storage unit 11 to the storage unit 12 when the temperature measurement unit 1o started operating, but instead of the falling edge detection tl) 18, the rising edge detection unit , and its reset terminal K U J (
In addition to supplying the ST signal with a slight delay,
By forming the MEMO·φ signal at the rising edge of the signal, the memory unit 11 is
The temperature measurement value held in VCHCp may be written into the storage unit 12 as the previous temperature measurement value for the next measurement VCHCp.

Furthermore, in the above embodiment, the notification unit 20vc displays the displayed value r T! according to the previous temperature measurement value Nx'. ”CJ display rli
For example, a rising edge detection section of the Q output of the latch circuit 6 may be provided to detect the rising edge of the Q output.
By generating an "H" pulse and supplying this pulse to the Nantes gate 25, the displayed value r on the display 15 is
T, 'C: Alternate display of J and r i', "C" is 6"
It is also possible to provide the notification signal D'R of the notification unit 20vc only during the initial period when the notification unit 20vc starts.

Even if you operate switch 1 before the tjl11 temperature value obtained by the temperature measurement section 10 reaches its maximum, the entire device will stop +
It is clear from the above theory ψJ.

As described above, in this embodiment, the operation of the entire device can be started and stopped by operating a single switch 1, and the current 6iJ temperature value or the maximum value is automatically detected by VCdF'. ! Once it is known, it will be easier to eliminate it.

If this example is a thermometer, in a conventional mercury body drawing meter, for example, it is assumed that the body temperature will be displayed by inserting it into the armpit for 5 minutes or more, but this example Now you can accurately confirm that your body temperature has been displayed, greatly improving the reliability of the displayed value.

In addition, in this example, when the “expression 1” benevolence reaches its maximum,
This maximum current 8III temperature value and the previous temperature measurement value are displayed alternately, and the notification makes it easy to distinguish between them, so it is easy and accurate to see the difference between the two and the trend of temperature change. be able to.

In short, this implementation sequence is very easy to operate, and moreover, a positive t'-1 measurement result can be obtained.

Furthermore, since a single switch is operated, there is no possibility of erroneous operation, and the circuit configuration is simplified, making it possible to downsize the silverware as a whole.

Furthermore, when the device starts operating, all segments of the display 15 are lit, and then the display value is 1'-LO℃.
'' is displayed, which allows you to check whether the display section is operating normally or not, and also to confirm that measurement has started, improving the reliability of the displayed content.

In addition, if the 1111 temperature value is outside the measurement range, a fixed number, symbol, or blank bulb will be displayed, causing unnecessary confusion to the user by displaying a meaningless temperature outside the measurement range. It is also possible to prevent things that would cause this.

In the above example, if the period during which the counter 8 counts l is approximately 0.7 seconds, the total segment lighting period of the display 15 is approximately 1.4 seconds, which is 7.7 seconds. (Also, the displayed value “L”
The display period of ``OoC'' will be 7 seconds, and this 51!1 is sufficient for these.
1: l-Nx and the previous time (lull temperature value N warmth' is also about 0.
The display is displayed alternately every 7 seconds, and this is enough to fully understand these things. However, the number 1"η" and the specific numerical values mentioned in the previous explanation are just examples. However, this invention is not limited to these numerical values.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to start and stop measurement by operating a single switch, and it is easy to obtain a measurement result that is sure to be % low. This measurement result and the previous measurement result are displayed alternately so that they can be distinguished from each other. This makes it easy to prevent 'A' manipulation, and it is also possible to accurately know the target temperature of the I/C, as well as easily know the direction of 1.f change in temperature, etc. I can do it.

Further, since a single switch is provided, the circuit (16 circuits) can be simplified and the device can be made into a 3D type.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the temperature measuring device according to the present invention, and Section 2 (aJ) is a timing chart for explaining the operation of Fig. 1. 1...・Switch, 4...Counter, 5
, 6... Latte circuit, 7, 8... Counter, 10... Temperature measuring section, 11.12...
・Storage unit, 13...Multiplexer, 14...
... Display decoder, 15 ... Display device, 19
. . . Notification signal generation section, 20 . . . Notification section, 23 . . . Counter.

Claims (1)

[Claims] A switch that can be operated from the outside, a first determination unit that determines whether the switch is opened or closed, a temperature measurement unit that starts operating in response to the output of the determination unit, and retains measurement data of the temperature measurement unit. a first storage section; a second storage section into which measurement data held in the first storage section is written when the temperature measurement section starts or ends its operation; a detection unit that detects that the data has reached a maximum value; a multiplexer that selects the measurement data read out from the first and second storage units according to the output of the detection unit; and a display section that displays the current measurement data by the temperature measurement section, and when the temperature measurement section starts or stops operating, the first storage section displays the current measurement data by the temperature measurement section. The storage unit stores the previous measurement data by the temperature measurement unit, and the multiplexer stores the measurement data read from the first storage unit during a period in which the current measurement data by the temperature measurement unit increases sequentially. After the data is selected and the current measurement data by the temperature measuring section reaches a maximum value, the measurement data read out from the first and second storage sections are alternately selected. Characteristic temperature measuring device.