JPS5833307A - Supporting structure of tuning fork type piezoelectric oscillator - Google Patents

Abstract

PURPOSE:To produce easily a miniature oscillator with a low cost, by fixing a tuning fork type quartz oscillator directly at an end of a lead pin piercing through the inside and outside of a case. CONSTITUTION:Two holes 28 and 29 are drilled to a quartz oscillator 27, and pins 31 and 32 protruding into a case are inserted into the holes 28 and 29 via a hermetic seal 30. These pins are bonded to fixed electrode parts 33 and 34 of the oscillator 27 by means of an adhesive of the alloy solder, etc. At the same time, the conduction is secured for the pins 31 and 32. The overflow of solder is completely prevented since a slit 27a is provided between electrodes 33, 34 and exciting electrode parts 33a, 34a. In such way, a miniature and highly accurate tuning fork type quartz oscillator is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixing and supporting structure for a tuning fork type pressure III vibrator.

An object of the present invention is to provide a simple support structure for a resonator.

The present invention is applicable to piezoelectric vibrators in general, and will be explained using a crystal vibrator as an example, which has a large amount of experimental experience.

In recent years, crystal oscillators have become smaller, and many water clocks and clocks using these oscillators as time standards have been released. The conditions required for a vibrator for such purposes are that it be small, inexpensive, and thin. The kR mover is not a traditional mechanical method,
It is made using photographic technology and chemical corrosion technology, so it has many advantages such as being suitable for daytime production.

Below, the 2** tuning fork type crystal resonator developed as described above and its conventional fixing and wiring method will be described in detail.

The first conventional example is shown in the figure, and the vibrator 1 is extracted from a NT cut crystal plate with a thickness of several 100 microfrons by chemical etching.

2 and 3 in the figure show m poles for applying an electric field to the vibrator.
Pole 2.5 is connected to terminal 6.7 by bonding wire 4.5. Electrode on the back side of vibrator 1! The shape of is shown as 11.2mK.

The vibrator 1 is mounted on a fixing base 8 with a part of the back electrode, a part KL indicated by 10 in FIG. 2, and an electrode terminal. At that time, a conductive adhesive such as alloy solder is used as the adhesive.

FIG. S is a diagram showing the direction in which the vibrator 1 is extracted,
The X-axis, Y-axis, and 2-axis are the crystal axes of the crystal.

In the figure, a shows the initial rotation angle, b shows the eye rotation angle in 2,
each g9. ．． 1g', taken within the range of 55'' to 70''. The pole 2. ! , 9. When an electric field is applied to oscillators 1 and 9, as shown in FIG. 4, the tuning fork begins to move. In FIG.

The above-mentioned vibrators are extremely small and can be easily mass-produced, but as shown in the 4th wJK, only the component in the X-axis direction of the electric field 11.12 is useful for driving the vibrator.
3.14, so as the angle β increases, the impedance (2) increases in inverse proportion to the snow β. In addition, the temperature at which the zero temperature coefficient of the frequency-temperature characteristic is obtained is higher as the angle β is larger, and β is 75@'e20℃, υ, then the dynamic impedance is 1MΩ or more.Therefore, for wristwatches. In order to satisfy the condition that the temperature required for a crystal oscillator is 25°C, the temperature at which the ridges can be obtained is around 25°C, so K has an angle β of 75″.
'↓υ must be made even larger, and the dynamic impedance at this time is several tens of MΩ, making it difficult to use the above-mentioned crystalline crystal oscillator in a wristwatch.

Figure Tate 5 is a conventional example of W42], which is an overview of a thin tuning fork type crystal resonator with a thickness not exceeding 200 microns, which eliminates the drawbacks of the above $1 example by changing the electrode shape and IC.

Figure wi6 is a general view from the back side of the vibrator in Figure 5! It is a diagram. The oscillator 15 is taken out from the crystal plate shown in al171WK using a photo-chemical corrosion method.
~10°. Hall 5-16°17.9
Reference numerals 25 and 26 in Fig. 4 are excitation electrodes for applying an electric field to the vibrator.

Figure 8 is a diagram showing the arrangement of the electrodes of this vibrator. The dynamic impedance of the coil is about 50 Ω, which is very small compared to the IjiRwJ coil shown in Figure 1, and it is recommended that the temperature at which the zero temperature f coefficient of the frequency-temperature 1+% relationship is obtained can be obtained by changing the angle γ. The temperature can be freely changed within the range of 20°C to 40°C without changing the impedance. f! Because it has good performance and is very small, it is suitable as a crystal oscillator for wristwatches.

Now, let's look at Figure #16 of JII5 @ Worker again. Conventional wiring methods used to apply such electric fields are also illustrated. Nine oscillators 1 with two-sided Km electrodes
Reference numeral 5 denotes a part of the back electrodes 25 and 24, and 27.degree. 28 is a friend metal film 113 made on the fixed base 24 made of an insulating material by mK vapor deposition, sintering, etc. to match the fixed electrode portions 27 and 28 of the vibrator. .19, electrode t6.25jl
P and electrode 17.26 are connected to electrode terminals 22, 25tlC, respectively, by bonding wires 20.21.

However, according to the above method, a separately manufactured fixing stand is required, which becomes a major obstacle in reducing the price and size.Furthermore, a ponting process is required9, which also requires a It was a hindrance.

As explained below, in the present invention, a crystal resonator is attached to one end of a lead pin that passes through the inside and outside of the case. ! This is an attempt to solve the above-mentioned drawbacks.

Figure m9 shows the first embodiment of the present invention, in which the crystal oscillator 27
Two holes 28 and 29 are drilled in it. A pin that protrudes into the case through the hermetic seal 30! 11 and 32 are inserted into the holes 18 and 29, and are fixed to the fixed electrode parts 6S and 54 of the vibrator 27 using an adhesive such as alloy powder, and conduction is established.

No. 11 is the embodiment shown in Fig. 115. The difference from the embodiment of theory 1 is that the vibrator 40 has a thousand-round notch 4 instead of a hole.
1.42 is provided, bin 45.44
The point that b is inserted into this notch is the same as before.

Next, nine improved embodiments will be explained using the K111 top view.

FIG. 11 is a side view of the example shown in FIG. 9, in which the bottle 52 and the vibrator 27 are fixed with solder 49 from both the upper and lower sides.

In FIG. 12, the bottle 50 is further strengthened, and the bottle 50 is provided with a bulge 51. This calf + Fi4m
The ring is fixed by soldering or caulking. It is also possible to process the Rurui bottle itself into such a shape.

The example in Figure 15 is 9I more than the one in Figure 14! A ring 52 is further fitted on the top of the vibrator 27 to fix the vibrator from both the top and bottom.

Also, in order to ensure the identification of the crystal resonator and bottle, it is best to increase the amount of welding agent such as solder, but conventionally, if there is too much welding agent such as solder, it will cause a vibrating cup. Where I am K
There was a risk that the vibration characteristics would be adversely affected. However, according to the configuration of the present invention, the electrode film of the crystal resonator is divided into two parts: the fixed electrode part with the bottle and the excitation electrode part of the tuning fork 1ii#, and moreover, between the fixed electrode part and the excitation electrode part Even if the amount of welding agent such as solder is increased in order to provide a slit (the part where the IIt electrode is not placed).

Since the slit prevents the solder from flowing, there is no adverse effect on vibration.In other words, the crystal resonator used in the present invention has a fixed electrode part 27, as shown in FIG.
According to the present invention, the slit 15a is arranged between the excitation electrode section 28 and the excitation electrode section 25. As is clear from the figure and figure 1ii111, the bottle 51 is attached to the fixed electrode part 55.54.
．． 52 is fixed with solder to perform support and conduction at the same time, and the fixed electrode part 55.54 and excitation @lili@S5
5a and 54a, the wave crests of the solder are completely prevented, and a small and highly accurate tuning fork type crystal resonator can be provided. In addition, in the drawing W410 showing the implementation of the pond of the present invention, a slit 40a is arranged between the fixed electrode part 45°46 and the excitation electrodes 545a and 46m.*f#JsThe fixed electrode and the excitation electrode are connected Since the electrode pattern is formed very thin, the outflow of welding agents such as solder will affect the kit.
This thinly formed electrode pattern part (for example, 64b of No. 9 mg) prevents the heat generated when the bottle and the crystal resonator are attached together to be conducted from the fixed electrode to the excitation electrode. This prevents deterioration of the excitation electrode and the crystal piece itself.

As is clear from the above detailed description, the present invention has made many improvements as described below.

1. There is no need for a special fixed stand. 5. By using an electrode film structure with slits in the crystal piece,
When fixing the crystal blank, the solder material or brazing material prevents the crystal blank with large surface distortion from flowing out near the base of the crystal blank, and a large amount of welding agent such as solder material can be poured into the crystal blank. A crystal oscillator with improved support and fixing force, stability, and excellent shock resistance is now available. In addition, the conduction of heat to the electrode film for excitation related to the piezoelectric drive of the crystal piece is reduced due to the q# formed on the crystal piece, and the W for excitation due to heat: * Deterioration of the performance of the film and crystal piece. can be reduced.

4. Continuity can be established between the front and back electrodes at the same time & shock is absorbed by the bending of the bottle, protecting the beech.

The deflection of the straight bottle relieves the stress caused by the difference in thermal expansion coefficient between the members constituting the mesh seal and the vibrator.

Furthermore, if this resonator is formed using photoetching technology, even resonators with complicated shapes can be easily mass-produced, which brings out even more advantages.

Since the @ vibrator of the present invention is small and inexpensive, it is particularly excellent as a vibrator for wristwatches.

[Brief explanation of drawings]

Figures 1 and 2 are general views of the front and back sides of a crystal resonator made by chemical corrosion. FIG. 5 is a diagram showing the cutting angle of the vibrator. FIG. 4 is a sectional view showing a method of driving the vibrator. Figures 5 and 11+6 are schematic views of the front and back of another crystal resonator made by chemical corrosion. Figure #s7 is a diagram showing the cutting angle of the above-mentioned cone. Figure wJ8 is a cross-sectional view showing the method of driving the above-mentioned rotor. FIG. 9 is a diagram showing a first embodiment of the present discoloration. #! Figure 1G shows a third embodiment of the present invention. Figure 11 is a side view of an embodiment of the tuna 1. The reason for $9112 is 1 of the embodiment which is a modification of the embodiment shown in Fig. 11.
Li 1 page drawing Ruru. FIG. 13 is a side view of an embodiment further modified from the embodiment shown in FIG. Applicant Shuwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami'g4 Figure'IJy + Katana Figure 91 Figure 2/ρ Figure

Claims (1)

[Claims] (1) A crystal piece having a tuning fork shape is provided with an electrode film for exciting the crystal piece, and an excitation electrode part in which the electrode film is arranged at least on the fork part of the crystal piece, and the crystal piece In a crystal resonator having a fixed electrode part which is fixed to an external lead terminal by a welding agent near the base of the crystal piece, the fixed electrode part disposed near the base of the crystal piece and at least four prongs of the crystal piece. A support structure for a crystal camera, characterized in that a slit is provided between the part and the excitation electrode part to prevent the welding agent from flowing out.