JPS6156927A - Temperature measuring device - Google Patents

Abstract

PURPOSE:To simplify the constitution and to male the operation simple, by holding the value of temperature, which is measured in correspondence with the opening and closing of an operable switch in the first memory part, storing the previous measured temperature value within a specified temperature range in the second memory part, and switching and displaying the values held by both memory parts. CONSTITUTION:The opening and closing signals of a switch 1, which can be operated from the outside, are judged by a judging part comprising a counter 5 and a latch circuit 6. In correspondence with the judgement, measurement is started by a temperature measuring part 11. When the result is larger than held value in a memory part 12, the value is rewritten. When the held vlue in the memory part 12 is within the specified value and this fact is judged by a measuring range detector 20, the held value in a memory part 21 is rewritten. Thus the maximum measured value up to the temperature measuring time point is held in the memory part 12, and the previous measured temperature value is held in the memory part 21. The detecting part 20 is operated by the closing sig nal of the switch 1. The measured temperature value in the meory prt 21 is displayed on a display device 15. The temperature measuring part 11 is operated by the opening signal of the switch, and the measured temperature value in the memory part 12 is displayed on the display device 15.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a temperature measuring device for body temperature needles, equipment observation, and maintenance, and in particular, it is possible to check the previous temperature measurement result before performing side temperature operation. Regarding an electronic temperature measuring device with functions.

[Conventional technology]

This type of electronic measuring device has been adopted in many fields in recent years, and in particular, it is rapidly becoming popular for home use, replacing the conventional mercury body temperature needle, due to its ease of use.

However, since it does not have a function that allows you to check the previous temperature measurement result like a mercury thermometer, it is necessary to make a memo for each temperature measurement. In order to solve this problem, we have added a memory function so that the temperature measurement results can be retained even after the power is turned off, and can be read out and displayed as needed. An electronic temperature measuring device was proposed (Published by:
See Electronics Digest Co., Ltd., December 1, 1975, "0MO8IC Handbook," pages 287 to 293.

[Problem that the invention attempts to solve]

In the above conventional technology, in addition to the switch for starting temperature measurement, a dedicated memory switch is provided for reading the temperature measurement results from the memory section, which makes the circuit configuration complicated and the entire device Since it is large in size and requires two switches to be operated separately, the operation is complicated and easy to operate incorrectly, and it is not suitable for home use mainly for women and girls.

[Means for solving problems]

This invention was made in view of the above-mentioned circumstances, and
51 m
u 'dAF'3 O811 @ mll m m 'k
"ゝ・fJI This not only simplifies the system and downsizes the entire device, but also simplifies operation and makes it 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 an embodiment of the temperature measuring device according to the present invention, in which 1 is a switch, 2 is an oscillator, 3 is a counter, 4 is a Nant gate, 5 is a counter, and 6 is an R8 type latch circuit. , 7 is a counter.

, 8 is an inverter, 9 is a counter, and 10 is a control unit.

11 is a temperature measurement section, 12 is a storage section, 13 is an out-of-measurement-range detection section, 14 is a display decoder, 15 is a display, 16 is a Nant gate, 17 is an R8 type latch circuit, 18° 1.9 is a falling edge edge detection section, 20 is a measurement range detection section, 21 is a storage section, 22 is a multiplexer, 23 to 27 are inverters,
28 is Nantes Gate.

In the figure, oscillator 2. Counter 3, 5, 7゜9j
Latch circuit 6.17. Control unit 10. Temperature measurement part 11.
,,.

Display decoder 14. The falling edge detectors 18 and 19 are
Each is in a reset state when the signal supplied to the reset terminal R is at a high level (hereinafter referred to as #'H'').

It is a normally open switch that is operated from the outside, and when this switch 1 is not operated, the - of Nantes gate 4 is closed.
The input on the other side is ``H'', and the reset input of the counter 5 and latch circuit 6 is ``H#'', so that they are reset. ``It's standard...ri MC
The reference clock MCK that generates K is divided into a predetermined frequency by the counter 3, and is sent to the input counters 5' and 9 and the display decoder 14, which is obtained by inverting the output signal of the gate 4 with the inverter 8''. MCK, created by ON signal 1
．． Switched to inactive state.
□The counter 5 and the latch circuit 6 constitute a determination section for determining whether the switch 1 has been operated. In this judgment section, the counter 5 prevents the switch 1 from malfunctioning due to chattering, and if the switch 1 is operated and remains closed for a predetermined period of time (about 0.1 seconds) or more, overflow, and its Q output becomes low level (
The latch circuit 6 is set at the rising edge of the output of the counter 59Q, and at the same time, the Q output is inverted from "L" to "L". Kara.

The converter 5 and the latch circuit 6 are in a reset state when the switch 1 is open, and the reset is canceled when the switch 1 is closed. The Q output of the latch circuit 6 is inverted from "H#" to 1L"', and each time the switch 1 is opened, its Q output is "
The 1° counter 7 inverts from L″ to H″. Is it a pit binary counter and one power is generated at the falling edge of the Q output of latch circuit 6? Each time you count, the Q
The output is reversed. , counter 7? , Q outputs are inverted by an inverter 23 and supplied as a q)18T1 signal to the display decoder 14 and the reset terminal R of the falling edge detector 18, as well as to the Nant gate 4.

When the GR8TI signal is "H", these circuits are in a reset state and the display 15 is showing a blank display (that is, nothing is being displayed).

Furthermore, when the GR8TI signal becomes L#, the reset of these circuits is released at the same time, and the display 15 displays predetermined data.

The Q output of the counter 7 is supplied to the Nant gate 28 together with the Q output of the latch circuit 6 to form the GR8T2 signal. This GR8T2 number is counter 9. Control part 1
0. Temperature measurement part 11. The signal is supplied to the latch circuit i7 and the reset terminal R of the falling edge detection section 18, and is also inverted by the inverter 24 and supplied to the Nant gates 1 and 6.

Counter 9 further divides the clock from counter 3. The predetermined branch station is supplied to the Qtm output control section 10, and controls the timing of temperature measurement in the temperature measurement section 11. The Qm output with a division ratio of twice the Qtm output is supplied to the latch circuit 17 as a set input. The latch circuit 17 is set at the first rising edge of the Q'' output of Kara 2 and 9 after the reset is released, and the Q output is inverted from 1H'' to ``L''K. This Q output is supplied to the falling edge detection section 18 which has already been released from reset, and a MAX.R signal representing the falling edge is formed. This MAX, R,
The signal resets the memory section 12, which is a D-type flip-flop, and erases the previous side temperature value that has been held so far. In addition, the Q output of the latch circuit 17 is
Also supplied.

When the reset is released, the temperature measurement unit 11 measures the temperature once per cycle of the Qtm output of the counter 9, and
Temperature measurement is completed immediately before m output.

Then, in synchronization with the rising edge of the Qtm output, the side temperature value obtained at that time is compared with the temperature measurement value held in the storage unit 12, and the temperature measurement value obtained at that time (hereinafter, the current temperature measurement value is When the temperature measurement value) is large, the temperature measurement section 11 generates a MAX.phi. signal, and writes the current temperature measurement value into the storage section 12 in place of the temperature measurement value held so far. Therefore, the storage unit 12 stores the largest temperature value among the temperature values obtained so far after the temperature measurement unit 11 is released from reset.

The temperature value held in the storage section 12 is read out and supplied to the out-of-measurement-range detection section 13 and the in-measurement-range detection section 20 . The out-of-measurement-range detection unit 13 detects the temperature value read out from the storage unit 12 when the temperature value is out of a predetermined measurement range.
In order to display that effect in step 5, multiplexer 2 sends data representing fixed numbers, symbols, patterns, etc. instead of the temperature value.
2 to the display decoder 14. In addition, the measurement range detection unit 20 detects whether the temperature value read from the storage unit 12 is within the predetermined measurement range, and if it is within the predetermined measurement range, the temperature value is - Generates a φ signal and replaces the temperature value held in the storage unit 21 with the temperature value read out from the storage unit 12.

This operation of the measurement range detecting section 20 is performed at the time when the Q output of the latch circuit 6 falls. That is, the falling edge of the Q output of the latch circuit 6 is detected by the falling edge detection section 19.
The ``H'' pulse representing this falling edge is supplied to the inverter 27, and a FiN signal which is ``L'' during the period of the ``H'' pulse is obtained. This FiN
The signal is supplied to the measurement range detection section 20, but this EN
During the "L" and "q" periods of the signal, the measurement range detection section 20 performs the above operation.

By the way, the EN signal almost coincides with the falling point of the latch circuit 6, but the MAX-R signal waits approximately the time until the Qm output of the counter 9 rises. It should be noted that when this previous temperature measurement value is outside the predetermined measurement range, the memory contents of the storage unit 21 are not rewritten, and the maximum temperature measurement value from the previous time or before is held as is.

□Here, the above predetermined measurement range is 35.0
℃~42.0℃. The out-of-measurement-range detection unit 13 detects 1"'LO°C" when the side temperature value read out from the storage unit 12 is less than 35.0°C, and "H-work°C" when it exceeds 42.0°C. ” is displayed on the display 15, respectively, and predetermined data is output at 6.

Multiplexer 221 Display Decoder 14 and Display 1
5 is the output of the 6111 out-of-range detection unit 13 and the storage unit 21
The display section that switches and displays the temperature readings from the

When the multiplexer 22 is an SA multiplied signal obtained by inverting the Q output of the latch circuit 6 with the inverter 26,
The input A, which is the temperature value read out from the storage unit 21, is selected and supplied to the display decoder 14. However, when the SA multiplied signal L# is selected, the output of the out-of-measurement-range detection unit 13 is selected and the input A is supplied to the display decoder 14. supply to.

The display decoder 14 decodes the output of the multiplexer 22 and causes the display 15 to perform the above display after the reset is canceled due to the fR8T1 signal becoming @L''. It is preset by the "H" DisPR signal supplied to the terminal PR, and supplies the display 15 with a signal that causes all segments to light up.

Next, we will explain the operation of this example by observing the operation timing of each part;
This will be explained using FIGS. 2 and 3, which show the process.

Even when the device is not in use, the storage unit 12 retains the previous base measurement value. When the power (not shown) is turned on, the display 1
5 is in the operating state. At the same time, the reset of the counter 7 is released, but its Q output is 1L# and the qSTI signal is "H". Therefore, the display decoder 14 is in a reset state, the display 15 is displaying a blank display, and the falling edge detector 19 is also in a reset state.

Also, switch 111 of Nantes Gate 4! + input is @
The other input UR8'I'1 signal is also "1".
'', the MCK ON signal obtained by inverting the output of the Nant gate 4 by the inverter 8 is 111#, and the oscillator 2 and counter 3 are in the reset state.

Furthermore, the Q output of the latch circuit 6 is 1H", and the counter 7
Since the Q output of is l J, Jl, GRf! 3T2
The signal is 1", counter 9. control part 10. temperature measurement part 1
1. The latch circuit 17 and the falling edge detector 18 are also in the reset state. The signal (1't8T2) of town 1'' is inverted by the inverter 24 and supplied to the Nantes gate 16, and the Q output of latch circuit 17 (1't8T2) is also supplied to the Nantes gate 16. rJ obtained by inverting the output of gate 16 with inverter 22
The isPR signal is ``L#''.

In this state, when the switch 1 is closed, the counter 5 and the latch circuit 6 are reset, and the input on the switch 1 side of the Nant gate 4 is inverted from 1H" to 1L#, so the MCK-ΦN signal is "L" and the oscillator 2 and counter 3 are also released from reset. therefore,
An oscillator 2 generates a reference clock MCK, which is frequency-divided by a counter 3.

Counter 5 counts the clock output from counter 3, but if switch 1 is closed for about 0.1 seconds or more, counter 5 overflows and its Q output goes "L".
to "H". Due to this inversion, the latch circuit 6
is set, and its Q output is inverted from H# to "L". At the falling edge of this Q output, the counter 7 counts by 1, and the Q output is inverted from "L#" to "@H", so that the GR8TI signal is inverted from "H" to "L". As a result, the display decoder 14 is released from reset.

On the other hand, the Q output of the latch circuit 6 is detected by the falling edge detector 19.
is supplied to the inverter 27, and a ``H'' pulse representing its falling edge is generated.This pulse is supplied to the inverter 27, and the EN signal becomes ``L#'' during this pulse period. During the "L" period of this EN signal, the measurement range detection section 20 takes in the previous temperature measurement value N8' held in the storage section 12. and,
This previous side temperature value N! ' is within the predetermined measurement range, as shown in FIG. Temperature measurement value N.

In place of , write the previous temperature value N;.

On the other hand, when the previous side temperature value Nx' is outside the predetermined measurement range, as shown in FIG. In the section 21, the temperature measurement values from the time before or before are held as they are.

Furthermore, since the SA multiplied signal L'' obtained by inverting the Q output of the latch circuit 6 by the inverter 26 is inverted to "H", the multiplexer 22 selects the A input and the previous temperature measurement value read from the storage section 21. Nx' (Fig. 2) or the previous temperature measurement value NxC (Fig. 3) is sent to the display decoder 14. At this time, the GR8T obtained from the Nantes gate 28
The 2R8T2 signal is #, and the latch circuit 17 is in the reset state and its Q output is H#, so the DisPR signal obtained from the inverter 25 is L", and the display decoder 14 is not preset. As a result, The display decoder 14 decodes the side temperature value Nx' or Nx supplied from the multiplexer 22, and the corresponding numerical value "11°C" or "Tx°C" is displayed on the display 15.

After that, when the switch 1 is opened, the counter 5 and the latch circuit 6 are reset again, and the Q of the latch circuit 6 is
is inverted from "L" to "H#". Since the counter 7 does not count this, the GR8T1 signal remains "L", and the switch of the Nantes gate 4 is "H'htxv1%". picture,. N9 is “IJ#”
It is. Therefore, oscillator 2 and counter 3 continue to operate.

On the other hand, since the Q output of the latch circuit 6 becomes "H" and the Q output of the counter 7 is "I-1", the GILST2 signal obtained from the Nant gate 28 becomes "L", and the counter 9 is reset. starts counting the clock from the release source counter 3, and the control...1 part 10
．． Temperature measurement part 11. The latch circuit 17 and falling edge detection section 18 are also released from reset.

At the same time, the Q output of the latch circuit 6 changes from "L" to 'H.
”, the 8A signal obtained from the inverter 26 is inverted from “l” to “L”, and the multiplexer 22 selects the B input. However, the QI'L8T
2 signal is inverted from "H#" to "L", the input on the inverter 24 side of the Nant gate 16 becomes "H", and the input to the other latch circuit 18 is also 1H#, so the DisP The signal is inverted from "L" to H, and the display decoder 14 is preset.

As a result, display decoder 14 is prohibited from accepting data from multiplexer 22 and all segments of display 15 are illuminated.

In this manner, by lighting all segments of the display 15, it is possible to confirm that the display decoder 14 and the display 15 operate normally before starting temperature measurement.

When the counter 9 continues counting and counts a predetermined number n, the Qt ratio output is inverted from "L#" to "H", and furthermore, n
When the count value reaches 20, the Qt ratio output is reversed from "H" to "L#" and the 9m output is "
Inverted from L# to “H”. The latch circuit 17 is set at the rising edge of this 9m output, and its Q output is "H".
to "L". The falling edge of this Q output is detected by the falling edge detection section 18 to form the MAX@R signal, which resets the storage section 12. As a result, in the storage unit 12, the previous temperature measurement value Nx' is deleted and the value 0 is held.

In addition, as the Q output of the latch circuit 17 becomes "L", the output of the Nant gate 16 becomes @H, and the DiaPR signal becomes "L" and the display decoder 14 The preset is canceled.As a result, the temperature value read out from the storage section 12 is supplied to the display decoder 14 via the out-of-measurement-range detection section 13 and the multiplexer 22; is 0 and is outside the measurement range, that is, less than 35.0°C. Therefore, the out-of-measurement-range detection section 13 supplies data representing "LO°C" to the display decoder 14, and therefore the display 15 displays this. be done.

When the count value of the counter 9 reaches 30, the Qt ratio output is reversed from "L" to "H", and the control section 10 detects the reversal of and sends a signal to the temperature measuring section 11.

On the other hand, the temperature measurement section 11 has completed the first 6111 temperature just before the rising edge of the Qt ratio output of the counter 9, and upon receiving the signal from the control section 10, reads out the temperature measurement value from the storage section 12 and displays it. Compare with temperature measurement value N1. In this case, since the temperature value taken out is zero, the current temperature value N1 is larger. Therefore, the temperature measurement section 11 sends the MAX/φ signal to the storage section 12, and the current measurement value N1 is larger. The temperature value N1 is written into the storage section 12. As a result, the display 15 will display the display value ``11°C'' for the temperature measurement value N.
--The period during which the counter 9 counts n is set to approximately 0.7 seconds, and therefore,
The Qtm output has a period of approximately 1.4 seconds, and the Qm output has a period of approximately 2.8 seconds. Therefore, the previous temperature measurement value T! '(Fig. 2) or the previous temperature value T, //<Fig. 3) during the display period and the entire segment lighting period of the display 15, respectively.
4 seconds, and during the period in which "LO℃" is displayed, fl
o, 7 seconds.

Furthermore, counter 9 continues to count, and karantoi nao is 4.
When the count value becomes 0, the Qtm output is reversed from "H" to "1L", and when the count value becomes 50, the Qtm output is reversed from "L#" to "1L".
-1". Accordingly, the temperature measurement section 11 compares the current temperature measurement value N obtained immediately before with the temperature measurement value N1 held in the storage section 12. , and when the mechanical temperature value island is large, it is enriched with the current side temperature value N in the storage unit 12. Therefore, the display: 515"1゛°°"゛"""'"""9 ""'°1 is displayed.

In this way, unless the switch 1 is operated, the counter 9 continues counting, and at the Qtm output rise point every 2n counts for about 1.4 seconds, the current temperature value and the temperature value held in the storage unit 12 are stored. When the current measured temperature value is larger, it is rewritten to the fA measured value in the storage unit 12. Therefore, the maximum temperature measured so far is displayed on the display 15, and the displayed value is updated as the temperature rises.

Note that the Qm output of the counter 9 rises every 4n counts, but the latch circuit 17 is kept in the set state and the above-mentioned side temperature operation continues.

Next, when the switch 1 is closed, the counter 3 and the latch circuit 6 are reset. In this case too, MCK・ON
Since the signal is held at L#, oscillator 2 and counter 3 are active. Therefore, the counter 5 counts the clock from the counter 3, and when it overflows after about 0.1 seconds, the latch circuit 6 is set and its Q output is "1 (
” to “L#: 1 Reverse. As a result, the Q output of the counter 7 is inverted from [1# to L'', and the GR8T1 signal is inverted from L# to H''. Therefore, the display decoder 14 is reset and the display 15 displays blank.

At the same time, the GR8T2R8T2 signal is inverted to "H", and the counter 9, control unit 10, temperature measurement unit 11° latch circuit 17, and falling edge detection unit 18 are reset. In this case, the MAX -R signal is not generated. Therefore, the maximum temperature measurement value N! up to now is retained in the storage unit 12. The temperature measurement value N□ becomes the previous temperature measurement value for the next temperature measurement.

Furthermore, QR8 which is one input of Nantes gate 4
The TI signal is @H#, and the other input on the switch 1 side is 'L' because switch 1 is closed, and the MCK ON signal is 11, but next, when switch 1 is open, When the power output of the Nant gate 402 becomes "H#", the MCK ON signal becomes "H#" and the oscillator 2 and the power output become "H#". The printer 3 becomes inactive. Of course, the counter 5 and latch circuit 6 are also reset.

In this way, the temperature measurement operation is completed and the system is stopped.

As described above, in this embodiment, by operating a single switch 1, the previous temperature measurement value or previous temperature measurement value and the maximum current temperature measurement value are switched and displayed. Therefore, the operation becomes very easy, and these switching displays display the previous temperature measurement value or the previous side temperature value by closing the switch 1, and then opening the switch 1. Since the current side temperature value is switched and displayed, the previous temperature measurement value or the past temperature measurement value before that can be viewed at any time and can be confirmed reliably. can. For this,
This can prevent erroneous operations and failure to check past temperature measurements. In addition, past temperature measurements will not be incorrect or meaningless temperatures outside the specified measurement range will be displayed.
There is no need to cause confusion to users. therefore,
When used at home, even women and girls can easily handle it.

Furthermore, before the temperature measurement starts, the storage unit 12 is reset and the stored contents become 0, and as a result, the display 15 shows "LO℃".
will be displayed, which confirms that temperature measurement has started.

Furthermore, by lighting all segments of the display 15 before starting temperature measurement, the display decoder 14 and the display 15
and can confirm that it is working properly.

In addition, in describing the above-mentioned example, although specific numerical values were shown, these are only examples, and this invention is not limited by these values.

In addition, if switch 1 can be opened and closed from the outside,
Button type, slide type, or body case (
Various types of reed switches can be used, such as a reed switch provided inside the reed switch (not shown) and operated from the outside using a wire net or the like.

Furthermore, 1-LO°C, which represents a temperature value outside the measurement range.

[) (Displays symbols, patterns, etc. such as I℃J Decoder: 2
"K11et"L'"'1"fjl//922""
'When the temperature value is outside the measurement range, the display decoder 14
It may also be configured to supply such symbols, patterns, etc. to the display 15. In this case, the out-of-measurement-range detection section 13 described above becomes unnecessary.

〔Effect of the invention〕

As explained above, according to the present invention, by operating a single switch, switching display between the past 1iIII edition value and the current temperature measurement value and starting and stopping the '61IJ temperature operation can be performed.

Furthermore, with a single operation of the switch, the previous 6111 temperature value and the current temperature value can be displayed and the temperature measurement operation can be performed, and the operation is extremely simple. Moreover, past temperature measurements are always displayed within a predetermined range of 611 [611], which could cause confusion during use, but the configuration is simple. The excellent effect of miniaturization can be obtained.゛.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a temperature measuring device by Akira Honkabutsu, and FIGS. 2 and 3 are timing charts for explaining the operation of FIG. 1. 1...Switch, 5...Counter, 6
...Latch circuit, 9 ...Counter, 1
0...Amount control section, 11...Side temperature section, 12...
...Storage section, 15..Indicator. 17...Latch circuit, 18...Open falling edge detection section, 20...1ll11 fixed range detection section,
21.Songs/Memory section. 22...Multiplexer.゛.

Claims (1)

[Claims] A switch that can be operated from the outside, a determination unit that determines the open/close operation state of the switch, a temperature measurement unit that starts measurement according to the output of the determination unit, and holds the temperature measurement value obtained by the temperature measurement unit. an in-measurement-range detection section that detects whether the previous temperature measurement value held in the first storage section is within a predetermined measurement range; and an in-measurement-range detection section. a second storage section that holds the previous temperature measurement value that is within the predetermined range detected in the second storage section; and a display section that switches and displays the current temperature measurement value held in the second storage section, and when the switch is closed, the measurement range detection section is activated and the temperature measurement value held in the second storage section is displayed. . A temperature measuring device, characterized in that, when the switch is then opened, the temperature measuring section is activated and the temperature measurement value held in the first storage section is displayed.