JPS5862918A - Tuning fork type bending crystal oscillator - Google Patents

Abstract

PURPOSE:To obtain a large frequency change against temperature, by selecting a cut-angle suitably. CONSTITUTION:A tuning fork bending crystal oscillator is formed with a Z plate. This tuning fork type bending crystal oscillator is turned by an angle phi, taking the X axis as a rotary axis and an angle of theta, taking a new axis Z' of the Z axis as a rotary angle. Denoting phi=-30-30 deg. and theta=25-165 deg., the tuning fork type bending crystal oscillator with a large frequency change, i.e. excellent sensitivity can be obtained. In using this oscillator as a temperature sensor for a clinical thermometer, with a short thermometry time and excellent resolution, i.e. excellent accuracy, the clinical thermometer can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cut angle of a tuning fork type quartz crystal resonator for a thermometer.An object of the present invention is to optimally select a cut angle so that the frequency changes with respect to salinity are large.

In other words, a tuning fork-shaped bent crystal with good sensitivity! @Nimei provides &iM child.

Normally, mercury glass thermometer needles have been widely used as thermometers.The reasons for this are that they are easy to use, easy to use in summer, inexpensive, and easy to handle.However, this mercury Thermometers also have shortcomings.They take a long time to measure body temperature, are difficult to measure the temperature of newborns and infants, are troublesome to shake, and are easy to break.Recently, these shortcomings have been improved. Thermistor type thermometers have appeared, but the relationship between eccentricity and resistance is not a straight line, TFC.

Thermistors suffer from the disadvantages of large variations in the elements due to manufacturing and the difficulty in ensuring element compatibility.

Furthermore, although the time required for one body temperature has been improved over that of a mercury thermometer, it is still unsatisfactory and takes about 1 to 2 minutes.

Therefore, the present invention 8A proposes a new tuning fork type bent crystal oscillator as a salinity sensor for a thermometer.By selecting the cut angle, an ultra-small tuning fork type bent crystal oscillator with a good g degree can be used for thermometers. ! A vine will form to serve. Therefore,
Is it possible to measure 11 electronic bodies during calibration time? ! There is something to do.

Hereinafter, the present invention will be explained in detail along the 8th plane.

1 as a thermometer! The physical properties to be considered are: (1) It must be small and lightweight to improve thermal response.

(Good frequency sensitivity to 2111 degrees.

can be mentioned. Of these two, regarding (1), recently,
A fairly small crystal unit was developed using a tuning fork-shaped bent crystal unit, and is often used as a cooling device for wristwatches. Therefore, when this is used as a hot water sensor for a thermometer, it has good thermal response and can shorten the time it takes to detect body temperature.

1 to 1 are perspective views of an embodiment of the electrode arrangement of a tuning fork type bending vibrator according to the present invention, in which excitation electrical contacts 2 and 5 are arranged on a tuning fork type crystal 1.

FIG. 2 shows a cross-sectional view taken along the line A-A in FIG.
When the pressure tube is applied, VcW is applied in the direction of the arrow. By applying an alternating force, the direction of the electric field is reversed, making it possible to excite it in the bending mode.

FIG. 15 is a perspective view of an embodiment of the electrode arrangement of the tuning fork type bent crystal resonator of the present invention, and is an example in which excitation electrodes 5.6 are arranged only on the back side of the tuning fork type crystal 40.

Figure 4 is located at the B-B cross section in Figure 5. As in the second case, the KII field moves in the direction of the arrow due to the direct fit pressure.By applying an alternating voltage, the direction of the electric field is reversed, and it is possible to excite it in the bending mode.

FIG. 5 shows a crystal oscillator unit of the present invention, with stem 1
It consists of Camp 2 and Camp 10.

Inside the unit, a fork-shaped bent crystal mover 7 is fixed to support lead wires 8, 9e by solder or adhesive. Also, Chara 710Vi nickel silver (65% (Iu-10%N)
1- Residual Zn) Since the thermoconductivity is non-luminous, a part of the surface is coated with a material with good thermoconductivity, such as Samekki 11, on the entire surface of the wax. It is measured at the resonant frequency of a tuning fork type bent crystal resonator through an 11-fi gold-plated tube. The diameter of the crystal unit is approximately 1.5-m6
．． Length T, +F! Since it is an ultra-fine crystal unit of about 61 IIs, its mass is small and its thermal response is excellent.

FIG. 6 shows the time required for the common frequency to stabilize when the temperature changes by 1 degree from room temperature to J4o°C.

Resonance frequency 1 at room temperature! ! From fo to the resonance station tII number fIVc at about 40℃, it takes about 15 seconds to 20 seconds to stabilize.
It can be seen that the thermal response is quite good compared to the conventional element.

Next, in (2), it is necessary that the frequency W and degree with respect to the temperature be good, and normally a tuning fork type bending vibrator having a frequency sensitivity tube with an absolute value of zoppφ or more is required.

The seventh factor is an example of the tuning fork type bent crystal resonator of the present invention formed from two plates.

Rotate the tuning fork type bent crystal resonator in Figure 8, No. 1, Circle 7 in the φg direction with the X axis as the rotation axis (with the anti-W8 pull direction as positive), and further rotate the z-axis with the new axis as the tube rotation axis. φ when rotated by degrees
, 0m-50, due to the relationship between θ degrees and frequency sensitivity α. 0°
, 30°, it is a j [i relationship. #Before snow 0°, the frequency sensitivity increases as φ increases, and the cut angle φ that becomes α-2αppm/'C is approximately 25°, which is 6. Further, as φ increases, αFi increases, and from 50[ α becomes maximum between 6orlF, and at that time α coefficient −
The sensitivity tube is very large at 80/l.Furthermore, as the cut angle increases, α decreases, and when φ is around 90 degrees, α reaches a minimum, and when the cut angle becomes even larger, α increases again to about 120 degrees. ali'l reaches a maximum, and as the cut angle ψ increases, the absolute value of α decreases, and α becomes −20/”C,! - The cut angle is approximately 165 degrees, which is 6. UIC%# -5II', 50° α changes slightly due to the 2'-axis rotation vζ. 7 At this time,
For the change tC in a, α due to the change in φΩ is exactly the same as when it is 0-0.According to the theoretical total 3IK, σN-3
0°, 50. ” f) トf!ia --20pp
I/IC cut angle φ approximately 20° and approximately 16°
That is, φ wealth 25 (165' and #■ -50° ~
506 can provide α of the present invention.

Is the relationship between φ, θ, and α described above a theoretical value, or is it determined by an experiment using the cut angle u of the present invention of 0° and φ-120'?
--1007'c, a tuning fork type bending vibrator with very good frequency sensitivity can be obtained! Ta.・Next 1tchTo explain with specific examples, 1. Resonant frequency f for timekeeping
, using 52768Hz, using resonance frequency f, '410 to 0OOH2 for hot water temperature detection, and frequency -
If the sensitivity is αt'-1GO/'c, it is possible to provide a thermometer with a temperature resolution of a1℃ in a fixed time of 1 second, which is quite good, and at the same time, the temperature measurement time including the measurement time is several seconds, which is much faster than that of conventional thermistors. It can be shortened to ~%. Further, the salinity resolution is determined by the frequency sensitivity, the resonant frequency for timing, and the resonant frequency for humidity detection, and the resolution becomes worse as the resonant frequency becomes higher, such as #1, which has good frequency sensitivity.

As described above, the present invention provides a tuning fork type bent crystal sensor with good frequency sensitivity by optimally selecting the cant angle of the tuning fork type bent crystal sensor, and uses this vibrator as a salinity sensor for a thermometer. By using this, it is possible to provide a temperature needle tube that takes a short temperature measurement time and has good minute function, that is, has high accuracy.

As a result, it is no longer necessary to measure the body temperature of newborns or infants by 71k.

[Brief explanation of the drawing]

1N is a perspective view of one embodiment of the t-pole arrangement of the tuning fork type bent crystal resonator of the present invention. Fig. w42 shows an AA cutaway of Fig. 1. FIG. 5 is a perspective view of an embodiment of the electrode arrangement of the tuning fork type bent quartz crystal resonator of the present invention. FIG. 4 is a B-BIIFr plane view of FIG. 5. FIG. 5 shows a sectional view of the crystal resonator unit of the present invention. Figure Tate 6 shows the resonance layer f1. when the salinity is changed from room temperature to about 40°C. 7 indicates the time for IIX to stabilize. Figure M7 is a perspective view of the tuning-fork type bent crystal resonator of I's invention, which is constructed from two plates. The m8 diagram shows the φ, #, and frequency sensitivity when the tuning fork type bent crystal resonator of the seventh prisoner is rotated by φ degrees with the X axis as the rotation axis, and further rotated by U degrees with the new axis of the Z axis, the d axis, as the rotation axis. This is a graph showing the relationship between α and the theoretical value. X...Electric axis! ...Machine axis 2...More than the original axis Mr. Daini Seikosha Co., Ltd. Agent Patent attorney Tsumugi Mogami III Fig. 6 @ 2ae Fig. II 4 Fig. 115

Claims (1)

[Claims] The tuning fork-shaped crystal resonator has a KyEp shape, and the tuning fork crystal resonator Fizw, txmt rotates from 25 degrees to 165 degrees as the rotation axis, and further rotates from 150 degrees to 30 degrees using the new axis of z, the l axis, as the rotation axis. It is formed from a rotated plate.
Tuning fork type bent crystal resonator with % signature.