JPS58161516A - Crystal oscillator - Google Patents

Abstract

PURPOSE:To hold a rectangular crystal bar with high stability and high impact resistance at all times, by using a metallic holder containing a concave slit and an L-shaped metallic holder having a concave slit respectively. CONSTITUTION:A metallic holder 12 having an end fixed to an inner lead terminal 14 and a concave slit 13 formed at the other end is provided to a base 15. In addition, an L-shaped metallic holder 8 is provided. The holder 8 contains a concave slit 9 at its end of one side with the other end fixed to an inner terminal 16. The both ends of a rectangular crystal bar 17 are put into both slits 9 and 13 to be held always 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 something.

Conventionally, various support structures for crystal resonators using T-plate crystal pieces, etc. have been known, but for extremely small resonators used in wristwatches, etc., a support structure with excellent impact resistance has been obtained. That was difficult. Furthermore, it is difficult to maintain a stable frequency in such a small crystal unit due to instability caused by misalignment of the crystal piece during support work, so a support structure with stable electrical characteristics is desired. Ta.

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 6 that is attached through the base 4, and a crystal piece 1 on which an excitation electrode 2 is formed is sandwiched therein to make it conductive. 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. This support structure still 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 shock 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 concave slit used in the present invention.
Bend it to make an L shape. 9 is a slit for inserting a crystal piece. FIG. 3 is a developed view of an example of a metal plate holder having a concave slit used in the present invention, where 11 is a hole for inserting the end of an internal lead, and 13 is a slit for inserting a crystal piece. FIG. 4 shows an L-shaped metal plate holder 8 having a concave slit and a metal plate holder 12 having a concave slit, each soldered to an internal lead terminal 16.14 attached through the base 15. FIG. 6 is a side view of the support structure of the present invention fixed by attachment or welding, etc., and electrically connected to external lead terminals 16 and 14;
The figure 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 6. An extraction electrode 19 connected to the excitation electrode 18 formed on the main surface of the crystal piece 17 and an L-shaped metal plate holder 8 stretched in the long side direction of the crystal piece 17 are fixed by soldering or with a conductive adhesive 20 or the like. In addition, the external lead terminal 16
I am communicating with. Further, an extraction electrode formed on the other main surface of the crystal piece 17, which is not shown in the drawing,
A metal plate holder 12 having a concave slit is fixed to the metal plate holder 12 by soldering or a conductive adhesive, and is electrically connected to an external lead terminal 14.

After the crystal piece 17 is assembled into the support structure in this way, 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 pressed onto the base 15 to seal the crystal piece 17. In this way, the support structure used in the present invention does not apply unnecessary stress to the crystal piece as explained in FIG. It also has excellent impact resistance and workability, making it suitable for mass production.

FIG. 7, FIG. 8, and FIG. 9 are developed views showing other examples of L-shaped metal plate holders having concave slits, and the broken line portions each indicate a bent portion. A crystal piece 1 is attached to the support structure using these metal holders as shown in Fig. 6.
10, 11, and 12 show the state in which 7 is installed. In the support structure shown in FIGS. 11 and 12, the cross-sectional shape of the side fixed to the base 15 of the L-shaped metal plate holder 22, 23 having a concave slit has an L-shaped structure, It is more advantageous in terms of impact resistance than the support structure shown in FIG. In addition, in the support structure shown in FIGS. 10 and 12, the L-shaped metal plate holder 21.23 having a concave slit is provided with apertures 24, 25 for frequency adjustment.
Since it is possible to easily form a vapor deposition pattern in a predetermined position and shape from 25 onto the excitation electrode, a crystal resonator with stable characteristics can be manufactured.

As is clear from the above description, the present invention not only makes it possible to realize a crystal resonator that is small and has excellent frequency-temperature characteristics, but also enables miniaturization without impairing the original characteristics of the crystal resonator. It has great industrial value because it has many features such as excellent impact resistance, easy assembly, and is suitable for mass production.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional crystal resonator before it is hermetically sealed, Figure 2 is a developed view of an L-shaped metal plate holder with a concave slit used in the present invention, and Figure 3 is the same. Developed views of metal plate holders with concave slits, Figures 4 and 6
The figures are a side view and a top view showing the state in which the metal plate holder shown in Figs. 2 and 3 is fixed to the base, and Fig. 6 is a perspective view showing the state before airtight sealing of an embodiment of the present invention. Figure 7. FIGS. 8 and 9 are developed views showing other examples of L-shaped metal plate holders having doglegs used in the present invention, and FIGS. 10, 11, and 12 are other embodiments of the present invention. 08.21, 22.23... L-shaped metal holder having a concave slit, 12... Concave slit. Metal holder with slit, 14.16... Internal lead terminal, 14.16... External lead terminal, 17... Crystal piece, 18.19... - Electrode, 24.25...Aperture for frequency adjustment. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4 Figure 6 Figure 7 Figure 8 Figure 0

Claims (3)

[Claims] (1) One short end of a rectangular crystal piece is fixed to one lead terminal attached to a base member, and a concave slit is provided at the end of the first metal holder. The other end of the short side 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 of the short side of the crystal piece is bent into an L shape. a cap that is inserted into and held in the slit of a second metal holder having a concave slit at its end, and hermetically seals the crystal piece and the first and second metal holders to the base member; A crystal resonator characterized by being equipped with. (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-shaped portion on the side to be fixed to the lead terminal. 2nd (2nd
) Crystal resonator described in section.