JPS6355246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support structure for a small thickness shear crystal resonator.

[Conventional technology]

Many thickness-shear crystal resonators that have been commonly used in the past have a support structure as shown in FIG. FIG. 1 will be explained. electrode film 2,
As shown in FIG. 2, a crystal piece 1 having a beveled curved surface made of metal such as silver or gold by vacuum evaporation as 2' has its outer periphery attached to support lines 3, 3' formed into a clip shape as shown in FIG. Inserted conductive paint, 4,
It is fixed with 4' etc. The support wires 3, 3' are insulated from each other and from the outer periphery of the hermetic terminal 5. Crystal piece 1 with electrical continuity taken out to the outside in this way
A sealing tube 6 is joined to the airtight terminal 5 by soldering or the like. After this, the inside of the sealed tube is vacuumed or under a nitrogen gas atmosphere.
It is sealed by plugging the small hole 7 provided in with solder or the like.

The crystal oscillator completed in this way can serve its purpose well in cases where size is not a problem and shock resistance is not required, such as in the field of communication, wall clocks, table clocks, etc. I was able to accomplish it.

[Problem to be solved by the invention]

However, a crystal resonator with this support structure requires a large amount of space inside the sealed tube due to the flexibility of the support structure, resulting in an excessively large volume as a crystal resonator, and has weak impact resistance. Furthermore, even if you ignore the poor workability and adjust the distance of this clip in advance before inserting the crystal piece, it is very difficult to reliably support the crystal piece at the optimal support position, so it is not portable. This makes it unsuitable for use as a small crystal oscillator for use in watches, etc.

The object of the present invention is to improve the above-mentioned drawbacks and to realize a small, thin, thickness-sliding crystal resonator that is highly resistant to external disturbances and can ultimately be used in portable watches.

[Means to solve the problem]

To achieve the above object, the present invention provides a support structure for a crystal resonator that includes a crystal piece, an airtight terminal in which an external lead-out terminal and a bottom are integrated, a cap, and a plurality of support members. The electrode is electrically insulated from at least a portion disposed near the outer periphery of the crystal piece, and restricts movement of the crystal piece in a direction perpendicular to the thickness direction of the crystal piece after assembly, and prevents rotation of the crystal piece. a ring-shaped second support member that supports the thickness direction near the outer periphery where the vibration of the crystal piece is most attenuated and has a surface facing the other outer periphery side surface; It has a third support member for integrating the first support member and the second support member, and the first support member and the second support member are connected while holding the crystal piece. The present invention is characterized in that a support block is formed integrally with the third support member, and the support block is fixed by the external lead-out terminal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a perspective view of a first embodiment of the present invention showing a support structure for a thickness-sliding crystal piece. FIG. 4 is a partially exploded perspective view showing a support frame constituting a support system for a crystal piece in order to explain the support structure of this embodiment in more detail.

In FIG. 3, a thickness sliding crystal piece 8 having a beveled curved surface has electrode films 9, 9' formed on the front and back sides of its main surface by a method such as vapor deposition. This electrode film 9,
9' is connected to pins 12, 12' of an airtight terminal 11 consisting of the bottom part and pins 12, 12', which are external terminals, by lead wires 10, 10' fixed to the outer periphery of the crystal piece with conductive paint, insulated from each other. ing.
In this embodiment, gold wires 10, 10' used as lead wires are bonded to pins 12, 12' by bonding. The other ends of the pins 12, 12' are connected to the lead terminals of the crystal resonator after a cap 13 is soldered to the airtight terminal 11 using a metallized portion 14 provided on the outer periphery of the airtight terminal 11 in a vacuum or nitrogen atmosphere. Become. Next, the support structure for the crystal blank 8 will be explained with reference to FIGS. 3 and 4.

The inner circumference of the support frame of the crystal blank 8, except for at least part of the electrode portion disposed near its outer circumference, is loosely fitted into an intermediate support frame 15, which is a first support member. This intermediate support frame 15 has a protrusion 1
6 is provided and fits into a recess 17 provided on the outer periphery of the crystal piece, thereby serving as a stopper against rotation of the crystal piece due to impact.

This metallic intermediate support frame 15 has protrusions 18, 19, 18', which play the role of supporting the crystal piece in the thickness direction, and support the thickness direction near the outer periphery where the vibration of the crystal piece is most attenuated. A metal upper support frame 20 having a ring-shaped second support member 19' is spot welded.

(The upper support frame 20 and the intermediate support frame 15 can be joined using brazing material, adhesive, etc., and they do not need to be joined.) Connecting portions 22, 23, 24, 22', 2 of the support frame provided at two locations of the lower support frame 21, which is the third support member made of plastic material.
3', 24' to form an integral support system and form a support block. The tongue portions 24, 24' of the lower support frame 21 are close to the tip of the crystal piece 8.
It also serves as a part of the support framework. Also, the radial length of the tongues 22 and 23 for connecting the support frame is different from that of the other tongues 22' and 23 in order to carry out the method described later.
It is longer than 3'. Further, concave portions 25 and 26 are provided on the outer peripheries of the upper and intermediate support frames 20 and 15, and are designed to engage with a convex portion 27 provided on the lower support frame 21 to prevent the support frames themselves from rotating relative to each other.

Actually, the crystal piece 8 is attached to the support system in the following order. First, the upper and intermediate support frames 20 and 15 are inserted into the joint portion of the lower support frame 21 having the longer tongue portions 22 and 23, and the lower support frame 21 is bent (the upper and intermediate support frames 20 and 15 (The diameter of a part of the outer periphery is reduced, making it possible to bend the lower support frame 21.) The upper and middle support frames 20, 15 are attached to the joint portion having tongues 22', 23'. Insert the other end to integrate the support system. Next, place the crystal piece on the short tongue 22',
Protrusions 18', 24', 1 on the joint side with 23'
9', further bend the lower support frame, and attach it to the joints 18, 24, and 19. At this time, the tongues 22 and 23 of the lower support frame 21 are longer than the amount of deflection of the lower support frame necessary for inserting the crystal piece 8 into the support system, so the tongues 22' and 23' are
The crystal piece can be attached as a support block without disassembling the support system, which must be long enough to allow insertion.

After the crystal piece is inserted into the support system in this manner, the support system is fitted into the pin portions 12, 12' of the hermetic terminal 11 and connected to the hermetic terminal. As described above, by being able to fix the support system for the crystal piece before joining it to the airtight terminal, the conditions for restraining the crystal piece can be optimized. The support system is divided into multiple support members, and the outer periphery of the crystal piece is made of a metal (such as copal) whose linear expansion coefficient is relatively similar to that of crystal, making it easy to obtain processing precision, and the conditions of the crystal piece and support frame are optimized. Errors in the machining of the crystal blank can be absorbed by supporting the thickness direction of the outer periphery of the crystal blank with elastic plastic regarding the bevel curved surface, which is difficult to achieve precision in machining the crystal blank. Furthermore, by integrating the divided support members before assembling them into the hermetic terminal, the support system can easily and completely support the crystal in an optimal state, and can be joined to the hermetic terminal without disturbing that state.

A vibrator with such a configuration is often used in the past, as mentioned above.
It has achieved a dramatic reduction in size (8.5φmm x 1mm) compared to the previous model, and as mentioned above, the optimal support conditions for the crystal have been obtained, making it an excellent shock-resistant crystal oscillator (made of concrete). (It will not break even if dropped from a height of 1.5m). Also,
If the electrical processing of the lead wires is done using a jig during the crystal oscillator manufacturing process, the oscillator can be completed before being bonded to the airtight terminal, and then directly embedded in the base plate of a mobile watch or circuit board and sealed. It is also very effective when the process is omitted and the watch case is used as a sealing tube or airtight terminal.

Further, FIGS. 5 and 6 show an example in which the present invention is applied to a crystal piece having a different shape. FIG. 5 is a plan view with the lid removed, and FIG. 6 is a sectional view thereof. The crystal piece 35 is fitted with a support frame 36, which is a first support member made of metal and loosely engaged with the outer periphery of the crystal piece 35. Furthermore, the thickness direction of the crystal piece 35 is a plastic second plate.
It is held down by an upper support frame 37 and a lower support frame 38 which are support members of the ring and are formed in a ring shape.
The two support frames are connected and integrated by two connecting members 39 and 40, which are third support members, as shown in FIG. Metal support frame 36 and airtight terminal 4
The pins 42, 42' implanted in 1 are pins 42, 42'.
Insulating properties can be maintained by providing an insulating film such as a Teflon coating on the portion of 42' that contacts the support frame 36.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the first support part, which holds the outer periphery of the crystal piece and has the role of stopping the crystal piece from rotating, is formed of a material having approximately the same coefficient of linear expansion as the crystal piece. , the state of support does not change depending on the temperature, and the crystal blank and the first
Since the backlash with the support part can be made uniform, good temperature characteristics can be obtained, and a crystal resonator with good precision can be obtained. In addition, a very small oscillator (8.5φmm x 1mm) is constructed by combining it with the second support part that supports the thickness direction of the crystal and integrating it as a support block with the third support part. By being able to support the pieces under optimal conditions, it is possible to realize a crystal resonator with outstanding impact resistance (withstands dropping from a height of 1.5 m onto a concrete floor), and the effects of the present invention are significant.

[Brief explanation of the drawing]

1 and 2 are perspective views and explanatory diagrams showing a support structure for a conventional thickness shear crystal resonator, FIG. 3 is an exploded perspective view showing a support structure for a thickness shear crystal resonator according to the present invention, and FIG. The figure is a partially exploded perspective view of Figure 3.
5 and 6 are top views and sectional views showing other embodiments of the present invention, and FIG. 7 is a perspective view of a coupling member 39. 1, 8, 35... Crystal piece, 3, 3'... Support line, 5,
11, 41...Airtight terminal, 12, 12', 42, 4
2'... Pin, 15, 36... Intermediate support frame, 20, 3
7... Upper support frame, 21, 38... Lower support frame, 39, 4
0...Connection member, 18, 19, 18', 19'...Protrusion of upper support frame, 22, 23, 24, 22', 2
3', 24'...Tongue portions of the lower support frame.

Claims (1)

[Claims] 1. A thickness-sliding crystal piece having an electrode, an airtight terminal that integrates an external lead-out terminal and a bottom part for connecting with the electrode of the crystal piece to establish electrical continuity with the outside, and the crystal piece together with the airtight terminal. a cap for airtightly sealing the cap, the surface of the crystal piece facing the airtight terminal is arranged approximately parallel to the bottom of the airtight terminal, and the crystal piece is supported by a plurality of supporting members. In a support structure for a thickness-shear crystal resonator, the electrode is electrically insulated from at least a portion of the crystal piece disposed near the outer periphery thereof, and is arranged in a direction perpendicular to the thickness direction of the crystal piece after being assembled. a first support member that regulates movement and serves to stop the crystal piece from rotating; and a surface that supports the thickness direction near the outer periphery where vibrations of the crystal piece are most attenuated and faces a side surface of the other outer periphery. a ring-shaped second support member that holds the crystal piece; and a third support member that integrates the first support member and the second support member; A small thickness sliding crystal resonator characterized in that a support block is formed by integrating a first support member and a second support member with the third support member, and the support block is fixed by the external lead-out terminal. supporting structure.