JPH0522071A - Non-contact electrode type crystal oscillator - Google Patents

Abstract

PURPOSE:To realize the non-contact electrode type crystal oscillator which can reduce temperature hysteresis and can obtain a stable frequency. CONSTITUTION:In the holding means of a non-contact electrode type crystal oscillator 1 constituted by holding the oscillator from both the sides with two outside plates so that the oscillation part of the oscillator can be faced to an electrode part formed on the outside plate, the non-contact electrode type crystal oscillator 1 is held from four directions by a U-shaped clip type holder 4, and further, this U-shaped clip type holder 4 is fixed and supported through a ladle- shaped leaf spring 5 to a base 3 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact electrode type crystal unit having an improved holding means.

[0002]

2. Description of the Related Art A crystal oscillator is used by being held by a holder. As the holder, there is Japanese Patent Application No. 63-275523 "Crystal Resonator" shown in FIG.
The present invention is an improvement of this already-filed application. Before describing the present invention, the present invention will be described below with reference to FIG.
Will be described briefly. 3A is a configuration perspective view of the non-contact electrode type crystal unit held by a holder, FIG. 3B is a sectional view taken along line AA of FIG. 3A, and FIG. It is an exploded view of a non-contact electrode type crystal oscillator part.

In FIGS. 3 (a) to 3 (c), reference numeral 1 is a non-contact electrode type crystal oscillator, and this non-contact electrode type crystal oscillator 1 comprises a disc-shaped upper outer plate 11 and a lower side. External play
A vibrator 12 having a convex cross-section sandwiched between the plate 12 and both plates, and the vibrating portion of the vibrator 13 and the electrode portions formed on the external plates 11 and 12 face each other. This is a non-contact electrode type in which the vibrator 13 is sandwiched between two external plates 11 and 12 from both sides. Reference numeral 2 denotes a holder, which is composed of an annular metal plate 21 and similarly annular metal members 22 and 23. The annular metal plate 21 is provided with four inwardly extending tongues 21a. Two of these tongues are arranged facing each other. The metal member 22 is placed on the metal member 23, the non-contact electrode type crystal resonator 1 is placed in a space formed inside the both annular metal members, and the metal plate 21 is placed thereon. Placed,
It is fixed with screws. The outer peripheral portions of the metal plate 21 and the metal members 22 and 23 forming the holder 2 are screwed by these screws, and these are fixed integrally. In this case, the non-contact electrode type crystal unit 1 includes the metal plate 2 that forms the holder 2.
It is held on the metal member 23 by the tongue piece 21a provided at 1. Reference numeral 3 is a base having terminals, and the holder 2 holding the non-contact electrode type crystal resonator 1 is mounted on the base 3. Z'and X indicate crystal axes of quartz, respectively.

In such a structure, for example, an annular metal plate 21 which constitutes the holder 2 for holding the crystal resonator 1
As the non-contact electrode type crystal unit (AT plate) 1 with the tongue piece 21, the expansion coefficient of the non-contact electrode type crystal unit 1 and the ring-shaped metal plate 21 are the same with respect to the Z ′ axis. Press at the position of ± 41 °. Therefore,
Since the holder 2 holds the non-contact electrode type crystal resonator 1 at a position where the expansion coefficient is the same, when the temperature changes, the non-contact electrode type crystal resonator 1 also holds.
Also expands, but since the expansion rate is the same, distortion due to temperature change can be reduced and a stable frequency can be obtained.

[0005]

However, in the non-contact electrode type crystal resonator shown in the above-mentioned prior art, the non-contact electrode type crystal resonator is vibrated from four directions in which the expansion rates of the non-contact electrode type crystal resonator and the holder are the same. By holding the child by the holder, it is configured to reduce the strain due to temperature change, but since there is a contact surface between the tongue piece of the holder and the external plate of the non-contact electrode type crystal resonator, Due to the difference in linear expansion coefficient, the non-contact electrode type crystal unit was distorted by the temperature. The strain applied to the external plate has caused the temperature hysteresis of the frequency.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a spring rigidity capable of absorbing a strain caused by a difference in linear expansion coefficient in a holder of a non-contact electrode type crystal resonator. It is an object of the present invention to provide a non-contact electrode type crystal resonator in which temperature hysteresis is reduced and a stable frequency can be obtained by adopting a structure for holding it.

[0007]

The structure of the present invention for solving the above-mentioned problems is characterized in that the vibrator is arranged so that the vibrating part of the vibrator and the electrode part formed on the external plate face each other.
Non-contact electrode type crystal resonator holding means sandwiched by two external plates from both sides, wherein the non-contact electrode type crystal resonator is held from four directions by a U-shaped clip type holder. Further, the present invention is characterized in that the U-shaped clip-type holder is fixedly supported on the base via a ladle-type leaf spring.

[0008]

According to the present invention, the non-contact electrode type crystal unit is held by the U-shaped holder, and the holder is fixed to the base by the ladle-shaped leaf spring. Therefore, the strain caused by the difference in the linear expansion coefficient between the non-contact electrode type crystal resonator and the base can be reduced, and the temperature hysteresis can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an assembling structure showing an embodiment of the non-contact electrode type crystal resonator held by the holding means of the present invention. In FIG. 1, the same elements as those of FIG. In FIG. 1, reference numeral 4 denotes a U-shaped, relatively rigid clip-type holder that holds the non-contact electrode type crystal resonator 1 from four directions as shown in the figure. Reference numeral 5 is a ladle type leaf spring, and the non-contact electrode type crystal oscillator 1 is fixedly supported on the base 3 by a U-shaped clip type holder 4. In addition, the ladle type leaf spring 5 and the base
The screws 3 are fixed with screws or the like.

In such a structure, the non-contact electrode type crystal resonator 1 composed of three crystal wafers of the same cut is
With the U-shaped clip type holder 4, from 4 directions,
It is fixed and supported without slipping. Further, the non-contact electrode type crystal oscillator 1 is fixedly supported by the base 3 by the ladle type leaf spring 5 via the U-shaped clip type holder 4.

As described above, the non-contact electrode type crystal resonator 1 is fixed to the base 3 via the ladle type leaf spring 5, so that the base 3 and the non-contact electrode type crystal resonator 1 are connected to each other. It is possible to absorb the strain caused by the difference in the coefficient of linear expansion, and to provide a structure in which the non-contact electrode type crystal resonator 1 is not strained.
Further, by using the ladle type leaf spring 5, the portion of the U-shaped clip type holder 4 can be moved horizontally and vertically as shown in FIG. Can be further reduced.

Therefore, the non-contact electrode type crystal oscillator 1 is held by the U-shaped clip type holder 4, and the U-shaped clip type holder 4 is base by the ladle type leaf spring 5. Three
Since the structure is fixed to, the strain caused by the difference in the linear expansion coefficient between the non-contact electrode type crystal unit 4 and the base 3 can be reduced, and the temperature hysteresis can be reduced.

[0013]

As described above in detail with reference to the embodiments, according to the present invention, the non-contact electrode type crystal unit is held by the U-shaped clip type holder, and the U-shaped Since the clip-type holder is fixed to the base with a ladle-type leaf spring, the strain caused by the difference in linear expansion coefficient between the non-contact electrode type crystal oscillator and the base can be reduced, and the temperature hysteresis Therefore, it is possible to realize a non-contact electrode type crystal resonator that can obtain a stable frequency.

[Brief description of drawings]

FIG. 1 is a perspective view of an assembling structure showing an embodiment of a non-contact electrode type crystal resonator held by a holding means of the present invention.

FIG. 2 is a diagram showing horizontal and vertical movements of a ladle type leaf spring of the apparatus shown in FIG.

FIG. 3 is a configuration diagram showing an example of a non-contact electrode type crystal unit held by a conventional holding unit.

[Explanation of symbols]

 1 Non-contact electrode type crystal oscillator 3 Base 4 U-shaped clip type holder 5 Ladle type leaf spring

Claims (1)

Claim: What is claimed is: 1. A vibrator is sandwiched by the two external plates from both sides so that a vibrating part of the vibrator and an electrode part formed on the external plate face each other. And a non-contact electrode type crystal unit holding means for holding the non-contact electrode type crystal unit from four directions by a U-shaped clip type holder, and further holding the U-shaped clip type holding unit. A non-contact electrode type crystal unit, wherein the tools are fixedly supported on the base via a ladle type leaf spring.