JPS58113730A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To measure the bodily temperature with high accuracy in a short thermometic time, by using a small-sized crystal oscillator as a temperature sonsor. CONSTITUTION:A detection pulse signal P1 is inputted to a counter 7 as a counting pulse and on one hand, a reference pulse sigal P2 is applied to the counter 7 as a gate signal and reset signal. Further, counting of the number of input pulses of the signal P1 at each rising point of the signal P2 is started and its counting action is continued during the time when a level of the signal P2 is high. And, the counting action is ended at each falling point of the signal P2 and the counter 7 is reset. After all, pulse number of the signal P1 generated at a high level period T of the signal P2 are counted repeatedly by the counter 7 and its counted data D are taken out as an output of a counting circuit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic thermometer, and more specifically, it is an electronic thermometer using a small crystal oscillator tube as an I1 degree thermometer.

Conventionally, a thermistor has been used as the m degree sensor, and electronic body temperature needles have been widely used, but in the case of electronic thermometers that use a 1-1 star.

(&1) There are large manufacturing variations in the characteristics of the thermistor elements, and the compatibility of the elements is also poor.

(b) l11 between the resistance value of the t-mister element and the Il expansion
If 411 is not a straight line, it will be used as security.

(c) Since the analog processing circuit is essential, Lhs + static errors are likely to occur due to the influence of drifts such as power supply, voltage, amplifier, etc.

It has some disadvantages.

These shortcomings can be resolved in the conventional system as well.

A crystal oscillator is used as a temperature sensor and an 11 degree needle is used, but since the heat capacity of the crystal oscillator is large, the temperature measurement time is relatively long. It has the disadvantage that the value of Va is small and the accuracy of determining Va is low. 1*.In the conventional crystal SIT needle, the power consumption in the large 1 oscillation circuit with high frequency of the crystal lfl oscillator is large (and it has excellent portability due to battery operation. It's difficult and hot★.

The object material of the present invention, therefore! It is possible to measure body temperature with high accuracy within 1 month of temperature measurement time, and it is a portable I! If you are looking for an excellent electronic thermometer, you can use it.

The electronic body temperature sensor Fj of the present invention is made using the photo II graphing technology #Sui: *Number e) Okame tuning fork type temperature sensor crystal oscillator and the vibration period of this temperature sensor crystal 69 element is measured. 1 constant circuit and 1 period measurement #ff'1? It is characterized by the fact that it is equipped with an operation circuit which calculates the temperature of the temperature body to be tested from the m1 constant result obtained, and a display unit which displays the temperature f according to the calculation result from the calculation circuit.

Below, the details of the IP1 tube of the present invention will be explained using the solid line shown below.

W111C shows a block diagram of an embodiment of the electronic thermometer according to the present invention, and the electronic thermometer 1 is equipped with a tuning fork type temperature sensor 1 sensor crystal IIs 2 as a temperature measuring sensor for a body to be tested (not shown). . As will be described in detail later, this crystal oscillator 2 is small, has a small heat capacity, and is configured so that the vibration period of the unit temperature is 4Ffd large, and this vibration period is counted. ★Me counting circuit 5#1ri
This is the case. The counting circuit 5 is connected to the crystal oscillator 2 and the oscillation circuit f#
It is equipped with a detection signal generation circuit 4 that generates a signal and a basic crystal oscillation circuit 5, and the vibration of the crystal oscillator 2 starts from the detection signal generation circuit 4.
A repetitive pulse signal having a period according to the #I18 period is output as the detection pulse letter P1.

On the other hand, the basic crystal oscillator circuit 5 includes a crystal oscillator 6f with good humidity characteristics, and the basic pulse signal Pa is substantially generated by a predetermined constant repetition of one period of pulse signals regardless of the quality of the ambient temperature. is output.

As can be seen from FIGS. 2(al) and (b), the repetition period of 1f and 2 is set longer than the repetition period of the detection pulse message Fs.

Returning to the 1st fAr, the detection pulse signal 11 is input as a counting pulse to the force generator 7, and on the other hand.

The basic pulse signal P- is applied to the counter 7 as a gate signal and a reset signal, and the reference pulse signal PsO
The counter starts counting the number of input pulses of the detection pulse signal P1 at each rising point, and continues counting while the level of the reference signal F is at a high level. Then, at the falling edge of the basic pulse signal C, counting 1 is completed and the counter 7 is reset. In other words, the fundamental pulse belief!
The detection pulse signal i generated during the high level period of ps
i F, f) When the number of pulses is equal to 7F, the repetition counter #! Then, the counting data D is heated as the output of the counting circuit S. Therefore, the count data D includes information W that is the frequency of the detection pulse signal Ps, that is, the repetition period ff1l.
If it has t, it becomes f.

The output ph large count data D is input as binary data to the arithmetic circuit 8f. The arithmetic circuit 8 receives the pre-known temperature of the crystal oscillator 2 and the detection pulse signal 14 F *
Based on the relationship between @wavenumber and

The counting data D tube and the temperature data KKt shown in the ii degree tube are exchanged. Therefore, as the calculation @@B, t-j, 911 is T4o where +sn between the above-mentioned temperature and one wave number is written.
It can be configured using Mt.

-Vertical data! 1 display circuit 9f is inputted to 1 display circuit 9f, and the temperature of that Owkk is displayed in digital form.

Fig. 1h shows a cross section showing the structure of a unit of a tuning fork temperature sensor and a crystal oscillator 2, which is an important structure of the electronic thermometer according to the present invention. The crystal pendulum 2 has a stem 21, a cap 22, and a ffFi inside the cap 22.
Tuning fork type bent crystal 1! 2M is fixed to the soldering pattern with adhesive fL and support II-V wires 24.25ff. Cap 22ij, nickel silver (65910u
-10%Ni -Remaining Zn) and has thermal conductivity? Improve your loaf.

A trta gold metal intermediate layer 26 is formed on the surface thereof.

Therefore, the temperature of the warm body to be tested is this gold plating layer! 6 to the Toriyoshi f crystal oscillator element 25ff. This cap is straight from 22! is about t5■.

The length is approximately 6 mm, and since it is light in weight, the heat capacity is also extremely small. , thermal response TIRX is extremely excellent.

For this crystal oscillator element 25, details #lff are shown in FIG.
As shown in 1, it is formed into an 11-pronged flat plate member,
The excitation electrodes 27 and 28 are disposed on the main plane fFj, and an excitation ring is also disposed on the reflection plane. When an alternating current voltage is applied to these excitation electrodes, the f-crystal resonator element 25 becomes an excitation source at the bending moat 9, as shown in FIG.

#61! ! i! l#/r, crystal pendulum element 2S
A cutout-like object is visible. As I have already said, this crystal oscillator is 25jJ, and its vibration period is voracious! Because it is necessary to have a degree of sexual intercourse.

The cut-out direction and angle lIL are changed depending on the woodcutter, and the cut-out material with the greatest temperature characteristics is selected. In this -If, crystal pendulum element 2■Ha zcut-! It is cut out at a predetermined angle of 11''0 (counterclockwise direction of pipe pressure) with 114+ as the turning axis.

At 7ryUv, the graph shows the difference between the value of θ and the 8-wave number cost per 1°C. From this graph, we can calculate that v, e becomes a large pot, and therefore α is very negative (α−
-20 (ppM/T,), the cut angle θ is approximately 25°. Furthermore, as Vrθ increases, a also increases! f increases, 50°
60'' (maximum D darkness and fkh, α at that time is approximately -80 [a PM/'C), which is a very naive value.

Furthermore, the cut angle is large (tan) and α small (α).

When θ is around 90°, αij is small. When # becomes history f gluttony, α increases again to η, and α reaches its maximum at θ-120°, and after that, as vk and θ become larger, the absolute value of α becomes smaller and becomes σ-165°. α-20CPP nearby
By the way, in the application f of the sensor of a zero thermometer, [H of α].

Normally, a change II of at least -20 (prM/'C) in absolute value is required, so if a cape envelope tube with a value of θ of 25° to 165＠ is used, no modification is necessary.

See Sections 111(a) to 81H(a),
Figures 6 and 71! ! A crystal resonator element 2 shown in FIG.
What is the process for making 5 using Foam 11 graphing technology Vr? explain.

First, a polished crystal wafer 511-layer with a thickness of about 100 μm was layered on the flesh side t##, and this 115 mg taro was used.
52 Deposit a 1llj thin film of gold on the fabrication plate 55 (Fig. 8(a)), then apply IIr double-sided photoresist with a hot cloth
Using a photomask with a pendulum-shaped pattern,
Projection II is carried out using a mask and liner. Etching with chrome metal etching fIi produces gold Jli 211111 with a large dew pattern (Fig. 8(b)).After this, a hydrofluoric acid etching bath is applied to dissolve the quartz tube. When it comes to Rin, Kanasu two-layer film (52, 55)
becomes the eyelid membrane, and the crystal wafer is removed in the desired shape (Fig. 8 (c)) - After this, the electrode pattern is also formed by the 1wt-like process (Fig. 8 (A)), as desired. A crystal oscillator element is completed.

When made using this method, *the pot can be processed with an accuracy of several microns,
What's more, more than 100 oscillators are produced from one Ueno disk at a time, and 1% of them are all dancing.
It is possible to manufacture a large quantity of r-quartz crystal pendulums with uniform characteristics such as being compact and easy to live in, and having a high blockage rate of the shaking cycle with respect to temperature changes.

This construction is 11iyJ'r! Then, the crystal oscillator, which is a temperature sensor, uses photo+1 technology.
Due to the heat resistance of the sensor, the heat capacity of the sensor is small, and the transient response characteristics are significantly superior compared to the conventional sensor.

Therefore, it is possible to realize an extremely reliable thermometer that can be used for one hour at a temperature measuring station. Furthermore, a tuning fork type crystal oscillator? By increasing the number of waves, the oscillation frequency can be set lower*, and therefore the power consumption of the circuit can be reduced and the size can be reduced lol! Therefore, it is possible to construct a compact thermometer that can be operated with a battery, but requires only a small battery and is highly portable. In addition, photo ring latsume technology VrL
Since we manufacture crystal oscillators, we are able to provide electronic body temperature needles with excellent compatibility with 117 sensors by obtaining sensors with uniform % performance.

As mentioned above, the Q14ff design of the present invention is to provide a large electronic thermometer that requires only a short temperature measurement time, has poor accuracy, and is excellent in portability and sensor compatibility.

Table Simple drawings taav4 Figure 1 is a block diagram of an electronic thermometer wA- of the present invention, stripe diagram 2 (&1 and Figure 2 (b) are waveform diagrams of each signal in Figure 1, Figure 1 shows an enlarged cross-section of the a1 degree sensor crystal oscillator, Figure 4 shows an enlarged perspective view of the crystal oscillator element shown in Figure 5, and Figure 5 shows an enlarged cross-section of the crystal oscillator element shown in Figure 4. The cutting angle r of the crystal pendulum element is shown in Figure t1g6.
An explanatory diagram for explaining rt#Il.

Room 7- is a characteristic curve diagram showing the relationship between the cut-out angle 1σ of the water a oscillator element and the spider wave number variation rate, Figures 8 (a) to 8 ((1) fl photolithography technique 1 [This is a process showing the manufacturing process of a crystal pendulum element by 'r.

1...Electronic thermometer 2...Sound 51pm degree sensor Crystal oscillator 6...Counting circuit 4...Detection signal brown generation circuit 5...Iks crystal oscillation circuit 6...Crystal oscillator 7...・Counter 8...Arithmetic circuit 9...Display circuit 2s...Tuning fork type bent crystal resonator element Pa...
Detection pulse p3 D...Counting data K...Temperature change data 9 Applicant: Keiji Seikosha Co., Ltd. Figure 1 Figure 2 (a) 'J1210 (b) Shi Ding T
T 悌 3 Illustrations 5S 6th (2)

Claims (1)

[Claims] 1. Temperature film made using photolithography technology tube
A tuning fork type temperature sensor crystal oscillator with a large vibration station rate for B, and the IIF sensor crystal oscillator 1 child C) oscillation #l1
A period measuring circuit that # forgives ila and h the period -5? circuit f
Yorubuchi? 11411flI! according to the calculation results from the calculation circuit that converts the result into temperature and the WA calculation circuit! An electronic thermometer that is equipped with a display that indicates 1*.