JPH02121512A - Crystal resonator - Google Patents

Abstract

PURPOSE:To improve the stability of a system which keeps stably the resonance frequency by holding a crystal resonator via its holding tool at a part where the coincidence is secured between the linear expansion coefficients of the materials of the vibrator and its holding tool. CONSTITUTION:A circular metallic plate 31 uses SUS630 to form a holding tool 30 for a crystal resonator 10. Then the resonator 10 is held at a + or -41 deg. position to its Z axis by means of tongue pieces 31a and 31b as well as 31c and 31d which are set opposite to each other. Thus, the resonator 10 is held at a part where the coincidence is secured between the expansion coefficients of the vibrator 10 and the tool 30. As a result, no difference of extents of expansion is caused between the resonator 10 and the tool 30 despite the temperature change since there is no difference of expansion coefficients between the resonator 10 and the tool 30. Then no stress is applied to the resonator 10 at all.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a crystal resonator with improved holding means.

<Prior Art> A crystal resonator is used while being held by a holder, and holders having structures as shown in FIGS. 3(a) to 3(C) are in practical use. In FIG. 3, reference numeral 10 indicates a crystal resonator, and reference numeral 20 indicates a holder thereof. (a) shows a case in which the crystal resonator 10 is held between the arms 22 and 23 of the holder 20, which is constructed by providing a pair of spring material arms 22 and 23 on the base 21. It is something. The figure (b) shows a holder 20 having a structure in which a pair of arms 22, 23 each having a slit are provided on the base 21, and a crystal resonator IO is held by the slits in the arms 22, 23. .

In addition, FIG. 3C shows a case in which a holder consisting of clips 24 to 27 is used to hold the crystal resonator 10 from all sides with these clips.

By the way, the crystal resonator 10 shown in FIG. 3 expands pt6 when the temperature changes. In addition, a holder 20 that holds this
also expands due to temperature changes. In this case, the crystal oscillator 10
If the linear expansion coefficient of the holder 20 is different from that of the holder 20,
Due to temperature changes, distortion occurs in the crystal resonator 10 in its holding portion. This results in unstable characteristics that are different from the original temperature characteristics of the crystal resonator, which causes deterioration in the long-term stability of the resonant frequency.

<Problems to be Solved by the Invention> The present invention has been made to solve such problems, and provides a crystal resonator equipped with a holding means that does not cause distortion even when the temperature changes. The aim is to provide this service.

Means for Solving the Problems> The present invention has been made based on the above problems, and
The quartz crystal oscillator is held by the holder at a portion where the linear expansion coefficients of the materials of the quartz crystal oscillator and the material of the holder that holds the crystal oscillator match. Hereinafter, the present invention will be explained in detail with reference to the drawings.

<Example> Fig. 1 is a configuration diagram of an embodiment of a crystal resonator held by a holding means according to the present invention, in which (a) is a perspective view of the overall configuration, and (b) is a perspective view of the overall configuration. AA" cross-sectional view of the main part of the figure, and (c) is a perspective view of the crystal oscillator part of figure (a). In figures (a) to (c), 10 is a crystal oscillator, This crystal resonator consists of a disc-shaped upper external plate 11, a lower external plate 12, and a resonator 13 with a convex cross section sandwiched between both plates.This is held with a 30-wire holder. The tool consists of a ring-shaped metal plate 31 and metal members 32 and 33, which are also ring-shaped.The ring-shaped metal plate 31 is provided with four tongue pieces 31a to 31d each facing inward.These tongue pieces are tongue pieces 31a and 31b
are facing each other, and 31c and 31d are facing each other. The metal member 32 is placed on the metal member 33, and the outer plate 1 is placed in the space formed between the inner sides of both annular metal members.
A crystal resonator 10 consisting of crystal resonators 1 and 12 and a resonator 13 is arranged, and a metal plate 31 is placed thereon. 41-44
are each screws. The outer peripheries of the metal plate 31 and the metal members 32 and 33 constituting the holder 30 are screwed by these screws, and these are fixed together. In this case, the crystal resonator 10 is held on the metal member 33 by 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 a crystal resonator 1
A holder 30 holding 0 is mounted on this base 40. Z- and X each indicate the crystal axis of the crystal.

Figure 2 shows the crystal resonator and the holder holding it at 25°C.
ll when the temperature rises from to 75℃! 1jVfi rate is shown. This diagram shows AT as a crystal oscillator.
This is when 5US630 is used as the plate and the holder, αq is the linear expansion coefficient of the crystal oscillator (AT plate), and αh is the linear expansion coefficient of the holder (SUS630). Expansion coefficient of the crystal oscillator αq is calculated and expressed using the temperature coefficient of Bechmann's coefficient of linear expansion up to the third order. Z- and X each indicate the crystal axis of the crystal.

As is clear from Figure 2, ±41° with respect to the Z" axis
At the position, the expansion coefficients of the materials constituting the crystal resonator and the holder match. In other words, Z- of the crystal oscillator of the AT board
If this crystal resonator is held with a holder made of 5US630 at a position of ±41° with respect to the axis,
Since their expansion coefficients are the same, the crystal oscillator will not be distorted even if the temperature rises.

In FIG. 1, a holder 3 that holds a crystal resonator 10 is shown.
5US630 is used as the annular metal plate 31 constituting 0, tongue pieces 31a and 31b facing each other, and 31
c and 31d allow the crystal resonator 10 to be held at a position of ±41° with respect to its Z-axis.

In the conventional crystal resonator shown in FIG. 3, which has a mounting means, no particular consideration was given to the holding position for holding the resonator. On the other hand, in the crystal resonator shown in FIG. 1 in which the crystal resonator 10 is held by the holder 30 at a place where the expansion coefficients are equal as described above, when a temperature change occurs, the crystal resonator 10 Although the holder 30 also expands, since their expansion coefficients are the same, there is no difference in the length of expansion due to temperature changes, and no stress is applied to the crystal resonator 10.

Note that the holder for holding the crystal resonator and the material thereof are not limited to the configuration shown in Figure 1; in short, the material of the holder for holding the crystal oscillator and the material for holding it must have the same expansion coefficient. By holding the crystal resonator with a holder, distortion due to temperature changes is reduced.

<Effects of the Invention> As described above in detail with the embodiments, according to the present invention, the vibrator is not distorted due to temperature changes, exhibits the original temperature characteristics of the vibrator, and is By using the device, it is possible to improve the stability of a system that stably maintains the resonance frequency by keeping the temperature constant.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a crystal resonator held by a holding means according to the present invention, in which (a) is a perspective view of the overall configuration, and (b) is a main part of (a). Figure (c) is a perspective view of the crystal oscillator part in Figure 2.
The figure is a diagram for explaining the characteristics of Figure 1, Figure 3 (a) ~
(c) is a diagram showing a crystal resonator held by a conventional holding means. 10... Crystal resonator, 11... Upper external plate,
12... Lower external plate, 13... Vibrator, 20
...Holder, 21...Base, 22.23...Arm, 24-27...Clip, 30...Holder, 31
... Annular metal plate, 31a to 31d... Tongue piece, 32
．． 33... Annular metal member, 41-44... Screw,
50...Base, 51.52...Terminal.

Claims (1)

[Claims] 1. A crystal resonator, characterized in that the crystal resonator is held by the holder at a portion where the coefficient of linear expansion of the material of the crystal oscillator and the material of the holder that holds the crystal oscillator match.