JP2531308Y2 - Crystal oscillator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crystal oscillator, and more particularly to a supporter for holding a main surface of a crystal blank facing a metal base.

[0002]

BACKGROUND OF THE INVENTION Quartz resonators are useful as a frequency or time reference source for various electronic devices because of their excellent resonance characteristics. In recent years, while miniaturizing,
Frequency deviation is more severe due to communication circumstances and the like, and a higher frequency deviation is desired.

[0003]

2. Description of the Related Art FIGS. 3 to 5 are views for explaining a conventional example. 3 is a cross-sectional view of the crystal unit, FIG. 4 is a view of the supporter, and FIG. 5 is a view of the crystal blank. The crystal unit is configured by hermetically sealing a crystal piece 2 in a metal container 1. The metal container 1 includes a metal base 3 and a metal cover 4, and both flange portions 5 (ab) are sealed by resistance welding.
The metal base 3 has a pair of lead wires 6 (ab) having a glass portion 7.
Project through the insulation. A flat plate (metal plate) supporter 8 (ab) is attached to the protruding portion of the lead wire 6 (ab). The supporter 8 (ab) has one end connected to the lead wire 6 (a
b) spot welding to the other end where the step 9 is formed,
Both ends of the crystal blank 2 are electrically and mechanically connected. The crystal blank 2 has an AT-cut rectangular shape and has excitation electrode pairs 10 on both main surfaces.
And the extraction electrodes 11 are extended to the outer peripheral portions at both ends.

[0004]

However, in the above-mentioned structure, the metal base 3 is moved up and down, for example, as shown in FIG. 6 by the pressing force at the time of resistance welding between the metal base 3 and the metal cover 4. It deforms and gives distortion to the crystal blank 2 via the supporter 8 (ab). Therefore, before and after sealing, there is a problem that the oscillation frequency changes due to stress sensitivity characteristics and the like. For this reason, for example, as shown in FIGS. 7 and 8, a rectangular through groove 12 is provided at the center of the supporter 8, or a cutout 13 (ab) is provided on both sides.
Some have tried to absorb the impact of resistance welding by providing flexibility. However, in each of these,
Since the connecting portion is linear, there has been a problem that the impact absorption efficiency is poor.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a crystal resonator for preventing a frequency change due to an impact.

[0006]

According to the present invention, a Y-shaped groove including a branch located at one end of a supporter and a base located at the other end is provided, and notches are provided on both sides of the base. Is the solution. Hereinafter, an embodiment of the present invention will be described.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view of a pair of supporters which are main parts of a crystal unit for explaining an embodiment of the present invention. The description of the same portions as those in the prior art example will be simplified.

[0008] As described above, the crystal unit is constructed by hermetically sealing a crystal blank 2 in a metal container 1 sealed by resistance welding. Then, the crystal blank 2 is held by a pair of supporters 13 (ab) which are the main components of the present invention (see FIG. 3). The supporter 14 (ab) is formed by pressing a flat metal plate, and has a substantially Y-shaped groove 17 composed of a base 15 and a branch 16 (ab).
b) is provided. Then, a central portion of one end on the branch side is defined as a joint portion 19, and a step portion 20 is provided on the other end on the base side. The arc-shaped portion protruding between the Y-shaped branches is referred to as a tongue piece 21, and the portion from the joint 19 to the other end along the Y-shaped periphery is referred to as a connecting portion 22 (ab). The hatched portion in the drawing is the welded portion 19, which is approximately the diameter of the lead wire. The outer periphery of both ends of the crystal blank 2 is electrically and mechanically connected to the step 20 of each supporter 14 (ab) by a conductive adhesive.

In such a case, the supporter 14 (a
The groove 17 in (b) is Y-shaped, and a notch 18 (a
Since b) is provided, the length of the connecting portion 18 (ab) can be increased by bending. Therefore, the supporter 14 (a
The buffering action of b) is enhanced to absorb the deformation of the metal base at the time of resistance welding, thereby preventing the oscillation frequency from changing. Further, since the joining portion 19 is made larger than the diameter of the lead wire by the tongue piece 21, the joining strength can be increased.

[0010]

[Other Matters] In the above embodiment, the supporter 14 (a
In the joining portion 19 in b), the tongue piece 21 projecting between the Y-shaped branches is made larger than the diameter of the lead wire, or the tongue piece 21 (ab) is projected on both sides as shown in FIG. It is a good thing.

[0011]

According to the present invention, a Y-shaped groove comprising a branch located at one end of the supporter and a base located at the other end is provided, and notches are provided on both sides of the base. ,
It is possible to provide a crystal resonator that prevents a frequency change due to an impact.

[0011]

[Brief description of the drawings]

FIG. 1 is a plan view of a set of supporters of a crystal unit for explaining an embodiment of the present invention.

FIG. 2 is a plan view of one supporter for explaining another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a crystal unit illustrating a conventional example.

FIG. 4 is a diagram of a supporter for explaining a conventional example.

FIG. 5 is a view of a crystal piece for explaining a conventional example.

FIG. 6 is a diagram of a metal base for explaining a conventional defect.

FIG. 7 is a diagram of a supporter for explaining another conventional example.

FIG. 8 is a diagram of a supporter for explaining another conventional example.

[Explanation of symbols]

14 supporters, 15 bases, 16 branches, 17 grooves,
19 Joint

Claims (1)

(57) [Scope of request for utility model registration] An end of a flat supporter is connected to a pair of lead wires protruding on a metal base, and the other end is extended in a direction away from each other. Both ends of the piece are electrically and mechanically connected to each other, and in the crystal resonator in which the crystal piece is horizontally held on the metal base, the branch is located at one end of the supporter and is located at the other end of the supporter. A quartz resonator comprising: a Y-shaped groove including a base; and cutouts provided on both sides of the base.