JPS58161517A - Crystal oscillator - Google Patents

Abstract

PURPOSE:To hold always a rectangular crystal bar with high stability and high impact resistance, by using a dogleg metallic holder and an L-shaped metallic holder having a dogleg part. CONSTITUTION:A metallic holder 12 an end fixed to an inner terminal 14 and the other end folded into a dogleg shape is provided to the base 15. At the same time, an L-shaped metallic holder 8 having an end fixed to an inner terminal 16 and the other end folded into a dogleg shape is provided. The both ends of a crystal bar 17 are attached to the dogleg parts of holders 8 and 12. The folding angle theta of the dogleg part is decided by the forms of both ends of the bar 17. In such a way, the crystal bar 17 can always be held with high stability and high impact resistance.

Description

[Detailed Description of the Invention] The present invention relates to a crystal resonator in which a crystal piece is hermetically sealed in a container, and an object of the present invention is to provide a crystal resonator that has excellent impact resistance, good electrical characteristics, and is easily miniaturized. It is.

Various types of support structures for crystal resonators have been known in the past, using MuT-plate crystal resonator pieces, etc., but for extremely small crystal resonators used in wristwatches, etc., support structures with excellent impact resistance have been proposed. It was difficult to obtain. Furthermore, in such a small crystal resonator, it is difficult to maintain a stable frequency due to instability caused by misalignment of the crystal piece during support work, so a support structure with stable electrical characteristics is desired. was.

FIG. 1 shows a typical example of a conventional support structure for a crystal resonator of this type. In the figure, a clip-shaped metal wire 3 is fixed by soldering to a lead terminal 5 that is attached through the base 24, and a crystal piece 1 on which an excitation electrode 2 is formed is sandwiched therein, and a conductive adhesive is attached. It is fixed with adhesive 6 to ensure electrical continuity. However, this support structure had unstable electrical characteristics and poor impact resistance, as described above, due to the stress exerted on the crystal 1 by the clip-shaped metal wire 3 or due to variations in the support position. However, this support structure had poor workability and was unsuitable for mass production.

The present invention solves the above-mentioned problems and provides a support structure for a crystal resonator that has stable electrical characteristics, excellent impact resistance, and good efficiency in support work.

Embodiments of the present invention will be specifically described below with reference to the drawings. In the following examples, a case will be described in which the present invention is applied to a cylindrical hermetically sealed container. FIG. 2 is a developed view of an example of an L-shaped metal plate holder having a dogleg-shaped portion used in the present invention.The metal plate holder is bent 90 degrees from the bending portion 9 to form an L-shape, and then further bent from the bending portion 10 to a predetermined angle θ1. Make it into a letter shape. The value of θ1 is determined by the shape of the end of the rectangular crystal piece in the long side direction, and is
'Q range. Still, FIG. 3 is a developed view of an example of a dogleg-shaped metal plate holder used in the present invention, and 11 is a hole for inserting an internal lead terminal 14.

It is bent from the bending part 13 to a predetermined angle θ2 to form a dogleg shape. The value of 02 is determined from the shape of the end of the rectangular crystal piece in the long side direction and ranges from 0° to 900°. FIG. 4 shows an L-shaped metal plate holder 8 having a doglegged portion.
A dogleg-shaped metal plate holder 12 is attached to a base 15, respectively.
to the internal lead terminal 16.14 installed through the
FIG. 3 is a side view of the support structure of the present invention, which is fixed by soldering or welding and is electrically connected to external lead terminals 16 and 14'. FIG. 6 is a top view of FIG. 4 viewed from XX. Moreover, FIG. 6 shows a state in which a rectangular crystal piece 17 with a beveled peripheral part is set in the support structure shown in FIGS. 4 and 5. The lead electrode 19 connected to the excitation electrode 18 formed on the main surface of the crystal piece 17 and the L-shaped metal plate holder 8 stretched in the long side direction of the crystal piece 17 are soldered or conductive adhesive not shown in the drawing. etc., and conducts with the external lead terminal 16'.

In addition, the extraction electrode formed on the other main surface of the crystal piece 17, which is not shown in the drawing, and the dogleg-shaped metal plate holder 12 are fixed with solder or conductive adhesive, and the external lead terminal 14' is It has continuity.

After the crystal piece 17 is assembled into the support structure in this manner, silver or the like is deposited on the excitation electrode by vapor deposition or the like in order to adjust the oscillation frequency of the crystal piece to a predetermined value. Thereafter, an airtight sealing cap (not shown) made of metal or the like is press-fitted into the base 16 to seal the crystal piece 1. In this way, the support structure used in the present invention prevents unnecessary stress from being applied to the crystal piece as explained in the conventional example in FIG. It is possible to obtain a vibrator, and it also has excellent impact resistance and workability, making it suitable for mass production.

FIGS. 7, 8, and 9 are developed views showing other examples of L-shaped metal plate holders having a doglegged portion, and the broken line portions each indicate a bent portion.

Figure 10 shows a state in which the crystal piece 17 is incorporated into a support structure using these metal plate holders in the same way as in Figure 6.
FIG. 9 is FIG. 11 and FIG. 12.

In the support structure of FIGS. 11 and 12, the base 1 of the L-shaped metal plate holder 21, 22 having a doglegged portion
The cross-sectional shape of the side fixed to 5 has an L-shaped structure, which is more advantageous in terms of impact resistance than the support structure shown in FIG. Furthermore, in the support structures shown in FIGS. 10 and 12, the L-shaped metal plate holder 2 having a doglegged portion
Apertures 23 and 24 for frequency adjustment are provided at 0.22 mm, and a vapor deposition pattern of a predetermined position and shape can be easily formed on the excitation electrode from this window.

It is possible to obtain a crystal resonator with stable characteristics.

As is clear from the above description, according to the present invention, not only can a small crystal resonator with excellent frequency-temperature characteristics be realized, but also miniaturization is possible without significantly sacrificing the original characteristics of the crystal resonator. It has great industrial value because it can realize many features such as excellent impact resistance, easy assembly work, and suitability for mass production.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional crystal resonator in a state before hermetically sealing it, Fig. 2 is a developed view showing an example of an L-shaped metal plate holder having a <-shaped portion used in the present invention, and Fig. 3 is a developed view of the same letter-shaped metal plate holder, and Figures 4 and 5 are the second
3 is a side view and a top view showing a state in which the metal plate holder shown in FIG. 3 is fixed to a base, FIG. 8 and 9 are developed views showing other examples of the L-shaped metal plate holder having a doglegged portion used in the present invention, and FIGS. 10 and 11.
12 and 12 are perspective views showing another embodiment of the present invention before being hermetically sealed. 8.20.21.22... L having a doglegged part
metal holder in the shape of 12, 14.16...internal lead terminal, 14.
16...External lead terminal, 17...Crystal piece, 18.19...Electrode, 23. 2'4・
...Opening hole for frequency adjustment. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 θ1 7 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (3)

[Claims] (1) One end of the short side of the rectangular crystal piece is fixed to one lead terminal attached to the base member, and the end is bent into a dogleg shape at the end of the first metal holder. holding the crystal piece, the other short side end of the crystal piece is bent into an L shape, one end is fixed to the other lead terminal attached to the base member, and the other end is in a dogleg shape. A cap is attached to the base member, which is held at the other end of the bent second metal holder and hermetically seals the crystal piece and the first and second metal holders. Crystal oscillator. (2) Claim (1) characterized in that, of the second metal holder bent in an L shape, the plate portion on the side fixed to the lead terminal is formed in an L shape. The crystal oscillator mentioned. (3) Of the second metal holder bent into an L shape, an opening is provided in the plate portion on the side to be fixed to the lead terminal. (2
) Crystal resonator described in section.