JPS6140524A - Temperature measuring device - Google Patents

Abstract

PURPOSE:To simplify constitution, by displaying the previous measured temp. value or stating the measurement of temp. corresponding to the operation state of one switch. CONSTITUTION:When a switch 1 is turned ON, a counter 3 overflows and the Q-output of a binary counter 17 is reversed to H while a display decoder is released from resetting to start display. At this time, a counter 2, a control part 10 and a temp. measuring part 11 are held under a reset state and the measurement of temp. is not yet performed. Therefore, the data of a memory part (MAX LTH)12 displays the previous measured temp. value held during this time. If the switch 1 is not again closed, the memory part 12 is reset to bring the memory content to ''0'' and prepares for the start of the measurement of temp. Because the memory content is ''0'' up to this point of time, a display part 15 displays ''L0 deg.C'' and it can be confirmed that the measurement of temp. was started. When the measurement of temp. is started, the comparison of a max. value is performed by a temp. measuring part 11 to perform a max. value.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a temperature measuring device for body temperature needles, equipment observation, and maintenance. The present invention provides an electronic temperature measuring device with a function that allows confirmation.

(Prior Art) This type of electronic measuring device has recently been adopted in many fields, and is rapidly becoming popular, especially in place of the conventional mercury thermometer for home use, due to its ease of use.

However, unlike mercury thermometers, there is no function that allows you to check the previous temperature measurement results before starting the temperature measurement operation, so the previous temperature measurement values are written and saved separately for each temperature measurement. There is a complexity that must be maintained.

Therefore, electronic temperature measuring devices have already been proposed that retain the temperature measurement results even after the power to the device is turned off and can be read out later if necessary. (Published by Electronics Digest Co., Ltd., December 10, 1975, rcMO3IC Handbook, pp. 287-2
(See page 93) (Problems to be solved by the invention) This device has a dedicated memory switch for reading out separately from the start of temperature measurement, which complicates the circuit configuration and increases the size of the entire device. In addition, two switches must be operated for each use, which is not very desirable for household use by a housewife or a woman.

(Means for Solving the Problems) This invention was made in view of the above circumstances, and includes a switch that can be operated from the outside, a determination section that determines the open/close operation state of this switch, and an output of this determination section. a temperature measurement section that starts measurement in accordance with the temperature measurement section; a storage section that holds the output signal of the temperature measurement section; and a display section that displays a display according to the stored signal in the storage section; The operating state of one switch can be determined by displaying the memory signal in the storage unit when the closed state is determined, and by starting temperature measurement when determining that the closed state has been opened, and displaying the temperature value. According to the present invention, it is possible to selectively display the previous temperature measurement value or start temperature measurement, thereby simplifying the configuration and making it compact and easy to handle.

(Explanation of Examples) Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the entire system, where 1 is a manually operated normally open switch (SW), such as a pushbutton switch, which is operated from the outside to start or stop the system.
2 is an oscillator ○SC(2+) using a CR or crystal for generating the system clock (MCK), and the system clock (MCK) is connected to the counter (1) 3 and frequency-divided.

These oscillator OS CF212 and counter (1) 3
is in an oscillating state and a reset release state during system startup or while switch (SW) 2 is in a closed state.

5 is a counter (3) for preventing malfunction due to chattering of the switch (SW) 1;
) is used to determine the closing period by pressing and holding 1.
Counter (3) 5 is connected to RS launch (R3I) 6 to determine an overflow condition. These counters (3
) 5 and the RS latch (R3I) 6 constitute a determination section, and when the switch (SW) 1 is open,
1.

7 is a 1-bit binary counter (B C1) which uses the Q output of RS latch (R3I) 6 as a clock input, and when its d output is "H", the entire system starts up.
8 is a NAND gate 1-(G2) for generating a reset signal (GRST2).
), the reset signal (GR3T2) is output when the system is stopped or the switch (SW) 1 is in the closed state.

9 is a counter (2) for further dividing the frequency of the counter (1) 3, and the Qj2 output is supplied to the control section 10 to control the timing of temperature measurement. Reference numeral 11 denotes a temperature measurement unit that measures the temperature and compares the magnitude of the measured temperature values, and the output signal of the maximum value among these temperature measurement values is held in the storage unit (MAX LTH) 12 consisting of a D-type flip-flop. The clock input MAXφ is obtained at the terminal φ when the temperature measurement value in the storage unit 12 and the actually measured temperature value are compared in magnitude in the temperature measurement unit 11 and the latter temperature measurement value is large. The stored signal will be changed and retained.

13 is an out-of-measurement-range detection section (L/H detection), and a storage section 12
If the stored signal is outside the predetermined measurement range, the display section 15 outputs data to the display decoder 14 such that it displays a fixed numerical value to indicate this fact. This function is configured to operate only while the EN input is "L", that is, while the d output of the RS latch 6 is "L".

The display decoder 14 inputs the reset input GR3TI to the display section 1.
5 is displayed blank, and preset manual control 1) isPR is configured to display all segments lit. 16 is a NAND gate (G3) for generating this precent input DisPR, 17 is an RS launch (R32) for overflow detection of the counter (2), and 18 is this (R32) 17
It is a falling detection part of the δ output of , and the MAX of its Q output is
R&: Reset the storage unit (MAX LTH) 12.

Next, the operating state of this system will be explained using FIGS. 2 and 3.

First, when the system is in a stopped state, the display section 15 is in a blank display state, and all other than MAX LT) (12 are in a reset state.

Therefore, when SW 1 is turned ON, the MCK ON signal becomes "L", the reset of OS C (212, counter (1) 3) is released, and MCK is output and its frequency is divided. At the same time, the counter (3) 5 and R3I '6 are also reset. If SW 1 is kept pressed for about 0.1 seconds or more, the counter (3) will overflow, R5I will be set and the δ output of R31 will become "L". Upon receiving the signal, the Q output of BCI 7 is reversed to H''.
The display decoder is reset and starts displaying. At this time, the counter (2) 2, the control unit 10. Temperature measuring section 11 (
(R32 and falling detection) The temperature has not been measured yet as it is in a stable state. Therefore, the data of MAXLTH12 displays the previous temperature measurement value held during this time.

Here, during normal temperature measurement, it is displayed as outside the measurement range, and if it is less than a certain value (for example, 32.0'C), rLo℃",
If it exceeds a certain value (42,0℃), rHI”cJ
However, the previous measured value display period is limited to the period when the R5l6 is "L" and the L/H detection 13 is working;
゜0℃J, if it exceeds 42.0℃, display the value as ``r42.0℃''.

Next, when SW 1 is turned off, counter (3) 5 and R
3I 6 is reset and the Q output of R3I 6 becomes H.
".GR3T2 becomes L", the remaining parts are reset, and the entire system starts up. Counter (2) 2
Until the first rising edge of the Qm output of R3217, the Q output of R3217 is "
Since it is “H”, the 0316 output becomes “L” and Dis P
R is applied and all lights are displayed.

About 1.4 seconds after SW l0FF, Q of counter (2) 2
When the m output rises for the first time, R3217 is set and this δ output becomes "", ′°, , I
D1s PR is canceled and all lighting display ends.

At the same time, MAXR is output by detecting the fall of the δ output, and the MAX LTH 12 is reset for the first time. The first temperature measurement is completed just before the second rise of the Qβ output of counter (2) 2, and until then the MAX
The data of LTH12 is 0 and the display is "LO°C". This display period is set to about 0.7 seconds.

The measurement is completed one degree at a time just before the rise of the QA output power from the second time onward, and the measured temperature value is compared in magnitude with the maximum value before that, and if the measured temperature value is larger, MAXφ is output,
The measured temperature value is stored in MAXLTH.

Next, when SW is turned on, counter (3) 5 and R3l 6
The reset is released, and in order to prevent malfunctions due to chattering, the counter (3) 5 determines whether the button has been pressed for 0.1 seconds, and then sets R3I 6, whose Q output becomes "L", and this signal is Attach BCI 7 is “L”
GR3TI and GR5T2 become "H" and the entire system is reset and the system stops.

However, since MAX R is not output at this time, MAX
Only LTH12 is not reset, and the maximum value remains stored until the next time the system is started up by one SW user, making it possible to display the previous value.

In this way, according to the above embodiment, by turning on the switch 1 from the outside as shown in FIG.
The maximum value of the previous temperature measurement result held in 2 is displayed, and if it is determined by the counter (3) 5 and RS latch 6 that the switch 1 is kept pressed, the maximum value is displayed. Continue displaying.

In this case, the determination of whether the press is continued is made by measuring the count number of the counter (3) 5, that is, the press continuation is determined by measuring the time. It can be set freely by setting it in advance at the time.

In addition, if the previous temperature measurement value exceeds the upper or lower limit range of the edge temperature, a fixed numerical value such as "r42.0℃" or "32.0'CJ" will be displayed, and the temperature measurement after the temperature measurement starts will be displayed. This is different from the rHIJ, [, Oj display that is displayed when the upper and lower limit ranges are exceeded, so that it can be determined at a glance that the previous value is displayed.

When the continued pressing is released, a period is set in which all segments of the display section 15 are lit, and the display section 15 and the display decoder 1 are turned on.
4 is configured to be able to confirm that it can operate normally before starting temperature measurement.

This full lighting display period is similarly time-controlled by counting.

Next, determine whether switch 1 is closed again,
If it is determined that the switch 1 is closed again, everything other than the storage section 12 will be reset and the system will stop, and the storage section 12 will continue to store and hold the previous temperature measurement result.

If the switch 1 is not closed again, the storage unit 1
2 to set the memory contents to "0" and prepare to start temperature measurement. Since the stored content is "0" up to this point, the display unit 15 displays "L○'Cl" so that it can be confirmed that temperature measurement has started.

When temperature measurement is started, maximum value comparison is performed in the temperature measurement section 11, the maximum value is updated and held in the storage section 12, and the maximum value is displayed.

After this, if switch 1 is closed, storage unit 12
The system will stop by resetting everything else except for that, but if switch 1 remains open, temperature measurement will continue.

Note that the switch 1 can be of various types, as long as it can be opened and closed from the outside, such as a bush button type, a slide type, or a reed switch installed inside the main body case (not shown) and operated from the outside with a magnet or the like. It is.

Also, in the storage unit 12, "L" or "
H” signal can be output by TPI, for example r
36.5°C" temperature value is "36.6°C" or r36
．． The display unit 15 is configured to display which value of 5° C. the value is closest to. In this case, the display section 15 displays r3.
The display is based on the presence or absence of snow, such as ``6.5a℃'', but it can also be displayed in finer detail such as 2/100 units, and the display is not a numerical value, but a symbol, pattern, or partially colored part. Alternatively, it is also possible to provide a display means such as a light emitting diode in a different position, or to emit a buzzer sound, etc.
This makes it possible to easily identify how close the 1/10 digit is to a value without displaying the 0 digit as a numerical value.

As described above, according to the present invention, it is possible to display the previous temperature measurement value, start temperature measurement, and stop the system with just one switch, making the structure simple and compact. .

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is a timing chart of the embodiment, and FIG. 3 is an operation flowchart of the embodiment. 1...Switch 5...Counter (3) 6...RS lunch 11...Temperature measuring section 12...Storage section 15...Display section. Applicant: Ryuji Fukuhara, Representative of Kyushu Hitachi Maxell Co., Ltd.

Claims (1)

[Claims] A switch that can be operated from the outside, a determination unit that determines the open/close operation state of this switch, a temperature measurement unit that starts measurement according to the output of this determination unit, and a storage unit that retains the output signal of this temperature measurement unit. and a display section that displays a display according to the stored signal in the storage section, and displays the stored signal in the storage section when the determination section determines the closed state of the switch, and when the switch is opened after the closed state. A temperature measuring device that starts measuring temperature when it determines that something is wrong, and displays the measured temperature value.