JPS5827549Y2 - Crystal oscillator support structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a crystal resonator that supports the crystal resonator with vibration resistance.

A conventional support structure for supporting a crystal resonator such as an AT-cut crystal resonator as a thickness-shear resonator supports a crystal resonator 1 by a pair of wire-shaped support handles 2.2, as shown in FIG. It has a structure that is supported within the case 3.

In such a conventional support structure, the support handle 2 is formed to be as thin and soft as possible to prevent the main vibration from being constrained by the support of the crystal resonator 1, thereby preventing deterioration of vibration characteristics and preventing shock and vibration. It is desirable to buffer and absorb external forces such as these, to prevent deviations in vibration amplitude and oscillation frequency, and to stabilize the oscillation frequency.

However, if the support handle 2 is made extremely thin, the mechanical strength of the support handle decreases, so that when an external force such as shock or vibration is applied, the crystal resonator 1 supported by the support handle 2 There is a risk that the vibration characteristics may be deteriorated such as the oscillation frequency may be distorted or the oscillation frequency may be disturbed.

For this reason, the distance between the crystal oscillator 1 and the case 3 must be made sufficiently large, and the entire crystal oscillator including the case 3 becomes larger. ,
Although the oscillation circuit has advantages such as stability of oscillation frequency and constants such as equivalent resistance, it is suitable for portable electronic devices such as portable electronic watches that require miniaturization due to the large case size. It was unsuitable for built-in use.

In addition, if the support handle 2 is made thicker and shorter, the case 3
Even if the crystal oscillator 1 is made small, it may be damaged by external forces such as impact.
Although there is no risk that the crystal oscillator 1 will collide with the inner wall of the case 3 and be damaged, the influence of the support on the crystal oscillator 1 will increase, making it difficult to improve the vibration characteristics and making it difficult to sufficiently resist external forces such as shocks. The drawback is that it cannot be buffered or absorbed, making it difficult to keep the oscillation frequency stable.

The present invention eliminates the defects found in the conventional support structure mentioned above,
The present invention proposes a support structure for a crystal resonator that can improve impact resistance without deteriorating the vibration characteristics of the crystal resonator.

Hereinafter, the present invention will be explained in detail with reference to the illustrated embodiments.

FIG. 2 shows an embodiment of a support structure for a crystal resonator according to the present invention.

In the figure, reference numeral 4 denotes a crystal vibrator made of a piezoelectric crystal such as quartz, tantalum oxide, niobate, etc., and has a disk shape with a bevel cut around the periphery.

The crystal resonator 4 has main electrodes 5.5 on a pair of opposing surfaces.
, and an extraction electrode 6 extending from the main electrode 5.5,
6 is formed by means such as sputtering or vapor deposition,
Furthermore, a hole 7.7 is provided on its outer circumferential surface as a support.

Reference numeral 8.9 denotes a support handle made of an elastic material having conductivity, one end of which is fixed to the hole 7°7 provided in the crystal resonator 4 through a conductive adhesive or the like. a wire-shaped first support handle 10.11; and the crystal resonator 4.
A plate spring 12.13 having a band shape as a second support handle which extends in an arc shape along the outer periphery of the spring, and to which the first support handle 10.11 is fixed via a joint 14.15. It is composed of.

The plate springs 12 and 13 serving as the second support handle are arranged so that the width W direction thereof substantially coincides with the thickness t1 direction of the crystal resonator 4, and the seal portion 17.13 such as a hermetic seal is arranged.
The proximal end portion is fixed to the case 16 via 18.

The support handle 8.9 consisting of the first support handle 10.11 and the leaf spring 12.13 as the second support handle is connected to the case 1.
The crystal oscillator 4 is mechanically supported inside the crystal oscillator 6, and is electrically connected to the main electrode 5.5 via an extraction electrode 6.6 formed on the crystal oscillator 4, and also serves as a rete electrode terminal. .

In the crystal resonator support structure configured in this way, when an external force such as an impact or vibration is applied in the left-right direction, the leaf spring 12 as the second support handle forming a part of the support handle 8.9 .13 is soft and elastically deformed in the thickness direction t, so that the external force can be sufficiently buffered and absorbed.

When a stronger external force is applied to the crystal oscillator 4, the leaf springs 12 and 13 serving as the second support handle are elastically deformed even more and come into contact with the inner wall of the case 16.
The crystal resonator 4 supported by the leaf spring 12.13 via the first support part 10.degree. The oscillation frequency can be maintained stably without the risk of changing the state, and the crystal oscillator 4 and case 16
The distance between the oscillator and the oscillator can be reduced, and the entire vibrator can be made smaller.

In addition, when an external force such as an impact is applied in the vertical direction,
Since an external force is applied in the width W direction of the leaf spring 12.13(7) as the second support handle, the leaf spring 12.13(7) serves as the second support handle.
The elastic strength of the leaf spring 12.13 is increased and the amount of elastic deformation can be reduced.
131C By appropriately determining the length and thickness of the first support handle 10.11 to be attached, the first support handle 10.
．． 11 can also buffer the above-mentioned external forces, and can sufficiently buffer and absorb external forces, and has impact resistance against external forces in all directions.

Furthermore, by providing a hole 7 as a support part in the crystal resonator 4 and fixing the wire-shaped first support handles io and i1 to the hole 7, the support area can be reduced and the vibration characteristics can be improved. can be achieved.

In this way, it is possible to reduce the negative effect of supporting the crystal oscillator 4, so even if the diameter of the crystal oscillator 4 is made smaller than before, it is possible to obtain sufficiently satisfactory vibration characteristics, and the vibration It is easy to miniaturize the entire transducer, and even when used in a portable electronic device such as a portable electronic watch, the excellent vibration characteristics of this type of transducer can be fully demonstrated. It can demonstrate sufficient performance.

Also, the support handle 8.9 is connected to the first support handle 10.11 and the second support handle 8.9 is connected to the first support handle 10.11.
Since the crystal resonator 4 is fixed to the first support handle 10.11 and the second support handle is fixed to the case 16, the first support handle is fixed to the case 16. Support handle 10.11 and leaf spring 1 as second support handle
2.13 can be fixed via the joint part 14.15, and the mounting can be easily adjusted and assembled, and the 1st. The dimensional tolerance of the second support handle can be increased, yield can be improved, and manufacturing costs can be reduced.

Although the details of the present invention have been explained above with reference to the illustrated embodiments, the present invention is not limited to what is illustrated; for example, the second support handle may be formed to have an elliptical cross section. At the same time, the first support handle and the second support handle can be integrally configured.

Furthermore, various changes and improvements can be made to the shape, structure, etc. of the crystal resonator.

As mentioned above, the support structure of the crystal resonator according to the present invention is
By having a structure in which the crystal resonator is fixedly supported by a support handle that extends along the outer circumference of the crystal resonator, when an external force such as a strong impact is applied in the left-right direction, the crystal resonator and the case are fixedly supported by the support handle. In addition to being able to prevent collisions with It is possible to reduce the constraint caused by the support of the crystal, prevent deterioration of vibration characteristics, and stabilize the oscillation frequency. The size of the crystal resonator can be made smaller than before, and the distance between the crystal resonator and the case can be reduced, making it easy to make the entire resonator including the case smaller and thinner. As a result, the intended purpose can be fully achieved, and there are many practical effects.

[Brief explanation of drawings]

FIG. 1 is a front view showing the support structure of a conventional crystal resonator, and FIG. 2 is a perspective view showing an embodiment of the crystal resonator according to the present invention. 4...Crystal oscillator, 10.11...1st
support handle, 12.13... second support handle (plate spring).

Claims (3)

[Scope of utility model registration request] (1) Providing a support handle extending along the outer periphery of the crystal resonator,
A support structure for a crystal resonator, characterized in that a crystal resonator is fixedly supported at the tip of the support handle. (2) The support structure for a crystal resonator according to claim 1, wherein the support handle is a belt-shaped plate spring. (3) Practical use in which the support handle is composed of a first support handle and a second support handle, and a crystal resonator is supported at one end of the first support handle, and the other end is fixed to the second support handle. A support structure for a crystal resonator according to claim 1 or 2 of the patent registration claim.