JPH06103821B2 - Crystal oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a crystal unit having an improved holding means.

<Prior Art> A crystal oscillator is used by being held by a holder, and a holder having a structure as shown in FIGS. 3 (a) to 3 (c) is in practical use. In FIG. 3, 10 is a crystal oscillator, and 20 is a holder thereof. (A) Figure shows
The crystal oscillator 10 is held by sandwiching the crystal oscillator 10 between the arms 22 and 23 of a holder 20 configured by providing a pair of arms 22 and 23 made of spring material on a base 21. (B)
In the figure, the crystal oscillator 10 is held by the slits of the arms 22 and 23 of the holder 20 having a structure in which a pair of arms 22 and 23 each provided with a slit are provided on the base 21. Further, in FIG. 7C, holding tools composed of clips 24 to 27 are used, and the crystal oscillator 10 is held from all sides by these clips.

By the way, the crystal unit 10 shown in FIG. 3 expands when the temperature changes. Further, the holder 20 that holds this also expands due to the temperature change. In this case, if the coefficient of linear expansion of the crystal unit 10 and the coefficient of linear expansion of the holder 20 are different, the crystal unit 10 is distorted in the holding portion due to temperature change.
Therefore, the temperature characteristic becomes unstable, which is different from the original temperature characteristic of the crystal unit, which causes deterioration of long-term stability of the resonance frequency.

<Problems to be Solved by the Invention> The present invention has been made in order to solve such problems, and provides a crystal resonator including a holding unit that does not cause distortion even when the temperature changes. This is the purpose.

<Means for Solving the Problems> The present invention has been made in view of the above problems,
In a crystal unit of a holder made of a ring-shaped metal plate and a ring-shaped metal member, which is arranged between the metal plate and the metal member, the holder is made of a stainless material and the holder is formed. Retained by a holder having four tongues formed so as to hold the crystal resonator inwardly with respect to each other on the ring-shaped metal plates in a positional relationship of ± 41 ° with respect to the Z ′ crystal axis of the crystal resonator. It is configured to do. Hereinafter, the present invention will be described in detail with reference to the drawings.

<Embodiment> FIG. 1 is a structural view of an embodiment of a crystal unit held by a holding means according to the present invention. FIG. 1 (a) is a perspective view of the whole structure, and FIG. AA 'sectional view of the main part of the figure,
FIG. 6C is a perspective view of the crystal unit shown in FIG.
In the figures (a) to (c), 10 is a crystal oscillator, and this crystal oscillator has a disk-shaped upper outer plate 11 and lower outer plate 12, and a convex cross-section sandwiched between both plates. The oscillator 13 of FIG. 30 is a holder, which is an annular metal plate 31, and an annular metal member 32,
It consists of 33. The annular metal plate 31 is provided with four tongues 31a to 31d that face inward. In these tongue pieces, tongue pieces 31a and 31b face each other, and 31c and 31d face each other. The metal member 32 is placed on the metal member 33, and the crystal oscillator 10 including the external plates 11 and 12 and the oscillator 13 is disposed in the space formed in the inner side of both annular metal members. A metal plate 31 is placed on. 41 to 44 are screws. The outer peripheral portions of the metal plate 31 and the metal members 32 and 33 that form the holder 30 are screwed by this screw, and these are integrally fixed. In this case, the crystal unit 10 is held on the metal member 33 by the tongue pieces 31a to 31d provided on the metal plate 31 forming the holder 30. 50 is a base having terminals 51 and 52, and the holder 30 holding the crystal resonator 10 is mounted on the base 40. Z'and X indicate crystal axes of quartz, respectively.

FIG. 2 shows the coefficient of linear expansion when the temperature of the crystal unit and the holder for holding the unit is raised from 25 ° C to 75 ° C. This figure shows the case where an AT plate is used as the crystal unit and a stainless material having a linear expansion coefficient of 10.8 ppm / ° C is used as the holder (hereinafter, this stainless material is referred to as SUS630). Αq is the crystal vibration The coefficient of linear expansion of the child (AT plate)
αh represents the coefficient of linear expansion of the holder (SUS630). The linear expansion coefficient αq of the crystal oscillator is obtained by using the temperature coefficient of Bechmann's linear expansion coefficient up to the third order. Z'and X indicate crystal axes of quartz, respectively.

As is clear from FIG. 2, the linear expansion coefficients of the material forming the crystal unit and the holder are the same at a position of ± 41 ° with respect to the Z ′ axis. That is, Z'of the crystal oscillator of the AT plate
If this crystal unit is held by a holder made of SUS630 at a position of ± 41 ° with respect to the axis, the coefficient of linear expansion will be the same, so the crystal unit will not be affected even if the temperature rises. There is no distortion.

In FIG. 1, SUS630 is used as the annular metal plate 31 that constitutes the holder 30 that holds the crystal unit 10, and the crystal unit 10 is formed by the tongues 31a and 31b and 31c and 31d that face each other. It can be pressed at a position of ± 41 ° with respect to the Z'axis.

In the crystal unit having the conventional mounting means shown in FIG. 3, the holding position for holding the unit has not been particularly considered. On the other hand, in the crystal unit shown in FIG. 1 in which the holder 30 holds the crystal unit 10 at the locations where the linear expansion coefficient is equal as described above, the crystal unit when the temperature change occurs. Both the oscillator 10 and the holder 30 expand, but since the linear expansion coefficients are the same, the difference in expansion length due to temperature change does not occur and the crystal oscillator 10 is not stressed. .

The holder for holding the crystal unit and the material thereof are not limited to those shown in FIG. 1. In short, the linear expansion coefficient of the material of the crystal unit is the same as that of the holder for holding the unit. By holding the crystal oscillator by the holder at the portion, distortion due to temperature change is reduced.

<Effects of the Invention> As described above in detail with reference to the embodiments, according to the present invention, since the vibrator is not distorted by the temperature change, the temperature characteristic inherent to the vibrator is exhibited. By using the tool, it is possible to improve the stability of the system or the like for maintaining the resonance frequency stable by keeping the temperature constant.

[Brief description of drawings]

FIG. 1 is a constitutional view showing an embodiment of a crystal unit held by a holding means according to the present invention. FIG. 1 (a) is a perspective view of the whole constitution, and FIG. 1 (b) is a main part of FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 3, (c) is a perspective view of the crystal unit shown in (a), FIG. 2 is a diagram for explaining the characteristics of FIG. 1, and FIG.
(C) is a figure which shows the crystal oscillator hold | maintained by the conventional holding means. 10 …… Crystal resonator 11 …… Upper outer plate 12 …… Lower outer plate 13 …… Resonator 20 …… Holder 21 …… Base 22,23 …… Arm 24-27 …… Clip 30 …… Holder 31 …… annular metal plate 31a ～ 31d …… tongue 32, 33 …… annular metal member 41 ～ 44 …… screw 50 …… base 51, 52 …… terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-202509 (JP, A) JP-A-50-81786 (JP, A) JP-A-54-116862 (JP, A) JP-A-61- 41215 (JP, A) Actually opened Sho 57-88322 (JP, U)

Claims (1)

[Claims] 1. A crystal unit of a holder made of a ring-shaped metal plate and a ring-shaped metal member arranged between the metal plate and the metal member, wherein the holder is made of a stainless steel material, and Four tongues formed so as to hold the crystal unit in a positional relationship of ± 41 ° with respect to the Z ′ crystal axis of the crystal unit facing each other on the annular metal plates forming the holder. A crystal unit held by a holding tool.