JPH0255414A - Piezo-oscillator - Google Patents

Abstract

PURPOSE:To strengthen the shock resistance by supporting both outer circumferential parts of a piezoelectric disk (crystal resonator) at a slit of a support and applying a conductive adhesives to 40-60% of the region protruded to the outside of the slit. CONSTITUTION:A slit 4 is formed to two support fixtures stood to a metallic base 1. A circular thin piezoelectric chip (crystal resonator) 3 is inserted between the slits 4 and latched mechanically by the support fixtures. A vibration electrode 6 is formed on both faces of the piezoelectric chip 3 and led up to the support fixtures 2 through electrodes 7, 7'. A conductive adhesives 8 is applied to 40-60% of the part of the piezoelectric chip 3 protruded from the slit and the support fixture 2 and the piezoelectric chip 3 are connected electrically. A couple of lead terminals 5 are connected to the metallic base 1. Thus, a product excellent in the shock resistance is manufactured.

Description

Detailed Description of the Invention (Industrial Field of Application) The field of the present invention is a piezoelectric vibrator, and in particular a crystal vibrator in which both ends of the outer periphery of a crystal piece are electrically and mechanically connected to the slit of a holder. Regarding.

(Background of the Invention) Crystal resonators are often used as oscillators and filter elements because of their superior resonance sharpness. In recent years, various electronic devices are frequently used in dynamic environments, and products with good shock resistance are desired.1 (Prior art) Figure 6 shows a conventional example of a crystal resonator. 1, which is a diagram for explaining
Note that FIG. 6(a) is an exploded perspective view, and FIG. 6(h) is a front view.

The crystal resonator is constructed by connecting a crystal piece 3 to a pair of holders 2 erected on a metal base 1 and covering them with a cover (not shown). The holder 2 is made of a flat plate and has a slot 1-4 in length in the extending direction of the plate surface. .

In Part 1, the plate surfaces are made to face each other and one end is connected to the lead terminal 5 of the metal base 1.The crystal piece 3 is formed on an ambidextrous surface, and from the first excitation electrode 6 to the outer periphery of both ends are bent electrodes. 7.Extend the 7" (Fig. 6(a)-1), then insert the outer circumferential parts of both ends into the s'l qt l-4, apply conductive adhesive 8 17, and connect electrically and mechanically. (Holding) 1. The conductive adhesive 8 is applied from the outer circumferential surface of the outer circumference of both ends of the crystal piece 3 protruding from the slit 4 to the amphibodi side (i.e., the slit).
- The entire length region of length l of 4 is used as the banding region of the conductive adhesive 8.

(Disadvantages of the prior art) However, the crystal resonator with the above configuration is
Since the entire length region of tl·4 is used as the application region of the conductive adhesive 8, the crystal piece 3 and the holder 2 are integrally coupled, that is, rigidly coupled. 2.17 The holder 2 is usually made of metal (Kovar).
Since there is no special buffering effect, external shocks act directly on the crystal piece 3. (7) In particular, cracks were formed from both ends of the slider 4 and the crystal piece 3 was damaged, causing oscillation to stop (defective) and impact resistance to deteriorate.

(Objective of the Invention) An object of the present invention is to provide a piezoelectric vibrator with good impact resistance.

(Solution Means) The present invention provides a solution for the holder. ] ? The solution is to set a coating area within 40 to 60% of the outer periphery of both ends of the crystal piece protruding from 17 from the one end of the slit, and apply a conductive adhesive to the coating area. The following is a detailed description of the present invention.

(Embodiment) FIG. 1 (J is a front view of a crystal resonator illustrating an embodiment of the present invention. The same parts as those in the previous embodiment drawings are given the same numbers and the explanation thereof will be simplified. .

In the same manner as described above, the crystal piece 3 is connected to a pair of holders 2 erected on the metal base 1.The holders 2 are connected to the lead terminals 5 of the metal base 1 with their plate surfaces facing each other The outer periphery of both ends of the crystal piece 3, where the bowed electrode 7 extends from the excitation electrode 6, is inserted into the slot 4 of the holder 2 and held. crystal piece 3
The area of length Zl, which is 40 to 60% of the length l from the lower end of the slint 4, is the application area, and the conductive adhesive 8 is applied to the outer periphery, for example. Apply from the surface to both main surfaces.

Figure 2 shows the area where the conductive adhesive 8 is applied by slitting I and length l.
It is an impact characteristic diagram showing the experimental results of the non-defective product rate when the conventional impact is 100% (total length) and the present invention is 50%. The impact characteristics are determined by a natural drop test on a hard wooden board, where the horizontal axis is the number of natural drops and the vertical axis is the rate of good products without oscillation stoppage. When the number of drops is 20 times, no defective products occur (1 curve (A) - 1, the coating area is 100% of the conventional one and L t: sometimes 1 to 20% of defective products occur. Curve (b) 1 is understood first.

Figure 3 is an experimental impact characteristic diagram showing the relationship between the application area and the failure rate of crystal resonators due to impact.
The horizontal axis is the conductive adhesive 8! I? / Length l of l・4
The coating area (%) for the coating area, and the vertical axis is the defect occurrence rate. ,
These are the measurement results obtained when the sample was allowed to fall naturally onto a hard wooden board 20 times in the same manner as described above.

From this experimental result, it is understood that the failure rate depends on the area where the conductive adhesive 8 is applied. Seventhly, the failure rate is minimized when the coating area is set to approximately 40 to 60% (length a) of the length 1 of the pick-up.

Furthermore, it has been shown that when the coating area is less than approximately 40%, the defective rate increases extremely (it gradually increases when it exceeds 70% and 60%).

In other words, if the coating area is less than approximately 40%, the bonding strength between the crystal piece 3 and the holder 2 will be impaired. In addition, if it is 60% or more, the shock is directly applied to the crystal blank 3 as a rigid connection as described in 17 above, so the failure rate increases. And about 4
In the range of 0 to 60%, the holder 2 and the crystal piece 3 are fixed to each other in approximately half the range, so that the bonding strength is maintained. Furthermore, since there is a gap between one end of the slit 2 and the crystal piece 3, the upper end of the crystal piece 3 swings when an impact occurs, which absorbs the impact and reduces the defect rate. If you minimize , you can guess Giwaro 1. For this reason, damage to the crystal piece 3, oscillation stoppage, etc. can be prevented, and impact resistance can be improved compared to the conventional example.

(Other matters) In the above embodiment, the conductive bone cement 8 was applied to an area of 40 to 60% from the lower end of the slit 4, but as shown in FIG. ] ? / 40~ from the top of I.
(17 may be applied to the area of i 0%. Also, as shown in Fig. 5, one holder bath!) = p The area of 40 to 60% from the lower end of I・4 and the other from the upper end. Alternatively, the conductive adhesive 8 may be applied to the conductive adhesive 8.

In addition, the above impact resistance experimental results show that the diameter of the crystal blank 3 is 6.5 (nm), the thickness is 0.12 m + n, and the diameter of the crystal piece 3 is 6.5 (nm), the thickness is 0.12 m + n,
Assuming that the length l is 2.8 m + n, the area to which the conductive adhesive 8 is applied is one end of the length of the sleeve 1, as long as these dimensions are not extremely different. 4 from the side
() ~ [i If it is 0%, it is resistant! The conductive adhesive 8 was applied to both main surfaces from the outer circumferential surface of both ends, but it is not necessarily limited to this, and for example, it can be applied only to both main surfaces or to the slit portion. Ninomino Suriso+
- It is inferred that the effect of the present invention will be effective if the length is 40 to 60% from one end (7).

The key is to apply conductive adhesive to an extent that maintains the bonding strength with the holder 2) and to provide a gap to the slit so that the other end of the crystal piece can absorb shock. :i1
There is a number 1.

(Effects of the Invention) The present invention provides that both sides of the crystal piece protruding from the slit of the holder:
Since the 60% range is the coating area 1, 2, and the conductive adhesive is applied to the coating area, it is possible to provide a piezoelectric vibrator with good r4 impact resistance.-1

[Brief explanation of the drawing]

FIG. 1 illustrates an embodiment of the present invention. FIG.
, Figures 2 and 3 explain the effects of one embodiment'#4
Opposite? This is a characteristic diagram. FIG. 4 and FIG. 5 are diagrams of a crystal resonator for explaining another embodiment of the present invention. . FIG. 6 is a diagram of a crystal resonator to explain a conventional example. 1 metal base, 2 holder, 3 crystal piece, 4 slot/socket 11.5 lead terminal, 6 excitation electrode, 7 extraction electrode, 8 conductive adhesive.

Claims (1)

[Claims] In a piezoelectric vibrator in which the outer periphery of both ends of a piezoelectric piece is sandwiched between the slits of a holder and electrically and mechanically connected with a conductive adhesive, the outer periphery of both ends of the crystal piece protruding from the slit is A piezoelectric vibrator characterized in that a coating area is within a range of 40 to 60% from one end side, and a conductive adhesive is applied to the coating area.