JP3047407B2 - Rectangular AT vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lead shape of a hermetic terminal for holding a piezoelectric vibrator and a holding structure for a rectangular AT vibrating piece cut by an AT cut.

[Conventional technology]

At present, among the many quartz oscillators, the most versatile oscillator is the AT oscillator.

This AT vibrator is used for consumer equipment such as a communication equipment clock.

Conventionally, only a disc-shaped AT resonator has been used as an AT resonator, but in recent years, the size and weight of electronic devices have been reduced, and a reduction in the size of a crystal resonator has been required.

Therefore, an AT vibrator machined into a rectangular shape long in the X-axis direction has come to be produced.

[Problems to be solved by the invention]

However, the conventional rectangular AT vibrator is a cylinder type and is still large, about 3 mm in diameter and 9 mm in height, and further reduction in size and weight has been desired.

FIGS. 3 (a), 3 (b) and 3 (c) show a front view, a side view and an elevation view of a conventional hermetic terminal, respectively.

In a conventional hermetic terminal, two lead wires 15 are hermetically insulated and sealed in a metal outer ring 13 via a glass 14 and the metal outer ring 13 is sealed.
The diameter R2 of 1.13 is 1.65 mm, and the thickness of the inner lead 16 of the lead wire 15 whose projection length from the glass 14 is short is the thickness of the lead wire 15 whose projection length from the glass 14 is long on the outer lead 17 side. Was the same.

Here, when reducing the size of the crystal unit, it is necessary to reduce the external size of the crystal unit, reduce the external size of the crystal unit, hold the crystal unit with a conventional airtight terminal, and create a rectangular AT unit. When an impact test was performed, the crystal piece had a problem of breaking at 10,000 G or less.

Further, the AT oscillator, the following relationship between the fundamental wave frequency f and (MH _z) and thickness t ₂ (μm).

t ₂ = 1670 / f Therefore, the higher the frequency of the fundamental wave, the thinner the thickness of the AT oscillator.

In recent years, the fundamental wave has a simpler oscillation circuit, so AT
There has been an increasing demand for high frequencies of the fundamental wave in the vibrator.

However, when the thickness of the AT vibrator is reduced, there is a problem that the AT vibrator is weak against shock.

Therefore, the present invention is to solve such a problem, and an object of the present invention is to provide a holding structure that has shock resistance to a small rectangular AT vibrator.

Another object of the present invention is to provide a holding structure having a shock resistance to a rectangular AT vibrator using a small and thin rectangular AT vibrating piece.

It is a further object of the present invention to provide a hermetic terminal for realizing an impact-resistant holding structure.

[Means for solving the problem]

The rectangular AT vibrator of the present invention connects the electrode at the end of the rectangular crystal piece cut by the AT cut, and two lead wires penetrating the airtight terminal, and encloses the crystal piece in a case. The outer lead of the lead wire is formed in a circular cross section, while the thickness of the inner lead at the portion connected to the electrode is 2/3 or less of the thickness of the outer lead. A flat portion is formed. The flat portion is connected to the electrode, the thickness of the crystal piece of the electrode portion is t ₂ (μm), and the thickness of the flat portion of the inner lead is t ₁ (μm).
m), the relationship of t ₂ > 4t ₁ −320 is satisfied.

In this case, 110Myu the thickness t ₁ of the flat portion of the inner lead
m or less.

Further, in the rectangular AT vibrator of the present invention, the outer lead of the lead wire is formed to have a circular cross section, while the thickness of the inner lead of the portion connected to the electrode is 2/3 or less of the thickness of the outer lead. As a result, a flat portion is formed on the inner lead, and the flat portion is connected to the electrode, and the surface of the flat portion is covered with solder having a composition ratio of approximately Sn: Pb = 1: 9. When the thickness of the crystal blank of the portion is t ₂ (μm) and the thickness of the flat portion of the inner lead is t ₁ (μm), t ₂
> 4t ₁ -420.

In this case, 135Myu the thickness t ₁ of the flat portion of the inner lead
m or less.

(Operation)

Since the present invention has the above configuration, the outer dimensions are in the X-axis direction.
Even a small crystal blank having a size of 4.6 mm or less, 1.5 mm or less in the Z'-axis direction, and 0.5 mm or less in the Y'-axis direction can produce a shock-resistant rectangular AT vibrator.

In the present invention, the reason why the rectangular AT vibrating piece is not easily broken is as follows as a result of an experiment.

In the conventional airtight terminal, the thickness of the inner lead and the outer lead was the same, 200 μm.

FIG. 4 is a cross-sectional view illustrating a state of displacement of a rectangular AT vibrating piece when an impact G is applied to a rectangular AT vibrator using a conventional hermetic terminal.

FIG. 4 (a) shows the inner lead of the conventional hermetic terminal 18.
19 is a cross-sectional view in a stationary state of a rectangular AT vibrator made by fixing the long side of the rectangular AT vibrating piece 20 with an adhesive such as solder, and pressing a case 21 into the hermetic terminal 18. .

FIG. 4 (b) is a rectangular shape from the stationary state of FIG. 4 (a).
FIG. 4 is a cross-sectional view showing a state of displacement of a rectangular AT vibrating piece 20 when an impact load G is applied in a thickness direction of the AT vibrating piece 20. As shown in the figure, since the thickness of the inner lead 19 is as thick as 200 μm, the rigidity of the lead is high. Therefore, when an impact load G is applied, only the rectangular AT vibrating piece 20 is bent, and the rectangular AT vibration The load concentrates on the point A of the piece 20.

FIG. 4 (c) is a cross-sectional view showing the state after FIG. 4 (b). As shown in the figure, the rectangular AT vibrating reed 20
The concentrated load applied to the point A results in breaking from the point A.

Thus, the minimum impact load G at which the rectangular AT vibrating piece breaks
Is hereinafter referred to as an impact resistance load.

FIG. 5 is a cross-sectional view for explaining a state of displacement of a rectangular AT vibrating piece when an impact G is applied to a rectangular AT vibrator using one embodiment of the hermetic terminal of the present invention.

FIG. 5 (a) shows an example of the hermetic terminal 22 of the present invention, in which the inner lead 23 and one short side of the rectangular AT vibrating piece 24 are fixed with an adhesive such as solder, and the case 25 is hermetically sealed. FIG. 4 is a cross-sectional view of a rectangular AT vibrator of the present invention formed by press-fitting into a terminal 22 in a stationary state.

FIG. 5 (b) is a rectangular shape from the stationary state of FIG. 5 (a).
FIG. 4 is a cross-sectional view showing a state of displacement of a rectangular AT vibrating piece 24 when an impact load G is applied in a thickness direction of the AT vibrating piece 24. As shown in the figure, the thickness of the inner lead 23 is
Since the inner lead 19 is thinner than the thickness of the inner lead 19, the rigidity of the lead is weakened, and when an impact load G is applied, both the inner lead 23 and the rectangular AT vibrating piece 24 are bent. The load will be concentrated at point B of FIG. Further, if the rectangular AT vibrating piece 24 bends a certain degree or more, it collides with the case 25, so that the rectangular AT vibrating piece 24
The vibrating bar 24 does not bend by a certain amount.
Therefore, by setting the thickness of the inner lead 23 to an appropriate amount, the rectangular AT vibrating piece 24 can be prevented from breaking.

FIG. 5 (c) is a cross-sectional view showing the state after FIG. 5 (b). As shown in the figure, the rectangular AT vibrating piece does not break.

FIG. 6 shows a rectangular AT vibrator having no case using an airtight terminal according to an embodiment of the present invention when a shock G is applied.
FIG. 4 is a cross-sectional view illustrating a state of displacement of an AT resonator element.

FIG. 6 (a) shows a case without the case formed by fixing the inner lead 27 of one example of the hermetic terminal 26 of the present invention and one short side of the rectangular AT vibrating piece 28 with an adhesive such as solder. FIG. 4 is a cross-sectional view of the rectangular AT vibrator in a stationary state.

FIG. 6 (b) is a rectangular shape from the stationary state of FIG. 6 (a).
FIG. 9 is a cross-sectional view showing a state of displacement of the rectangular AT vibrating piece 28 when an impact load G is applied in the thickness direction of the AT vibrating piece 28. As shown in the figure, the thickness of the inner lead 27 is
Because it is thinner than the thickness of the inner lead 19 of 18,
When the rigidity of the lead is weak and an impact load G is applied, both the inner lead 27 and the rectangular AT vibrating piece 28 are bent, so that the load is concentrated on the point C of the inner lead 27. However, unlike the case of FIG. 5, there is no case where the rectangular AT vibrating piece 28 bends and collides, so that the rectangular AT vibrating piece 28 is bent to the limit.

FIG. 6 (c) is a cross-sectional view showing the state after FIG. 6 (b). As shown in the figure, the rectangular AT vibrating piece 28 is broken.

Thus, in the rectangular AT vibrator of the present invention, when an impact load G is applied, both the inner lead and the rectangular AT vibrating piece are bent and a concentrated load is applied to the root of the lead,
If the rectangular AT vibrating piece bends more than a certain amount, it collides with the case, so that the rectangular AT vibrating piece can bend only a certain amount, so that the rectangular AT vibrating piece does not break and the shock resistance is improved.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples.

1 (a), 1 (b) and 1 (c) are a front view, a side view and an elevation view of an embodiment of the hermetic terminal of the present invention.

In one embodiment of the hermetic terminal of the present invention, two lead wires 3 are hermetically insulated and sealed in a metal outer ring 1 via a glass 2.
The intended metal outer ring 1 with a diameter R1 is a 1.65 mm, the protruding length is long the lead wire 3 from the inner lead 4 side in the thickness t ₁ and the glass 2 of the protruding length is short the lead wire 3 from the glass 2 of the relationship between the thickness T ₁ of the outer lead 5 There is.

In the embodiment, T ₁ = 200 (μm).

FIG. 2 is a perspective view showing one embodiment of the rectangular AT vibrator of the present invention.

The rectangular AT vibrator of the present invention includes a rectangular AT vibrating piece 7 on which an electrode 6 is formed by a method such as vapor deposition, and an inner lead 10 at one end of two lead wires 9 penetrating an airtight terminal 8. Fixing one end of the electrode 6 with an adhesive such as solder 11;
Further, the case 12 is formed by press-fitting the airtight terminal 8.

The hermetic terminal 8 uses the hermetic terminal of the present invention.

There is also a length of the rectangular AT vibrating reed 7 l, a thickness as t _2.

Figure 7 is an inner lead thickness t ₁ and the impact limit load G
Is a graph of the case where the relationship between the changes of the thickness t ₂ of the rectangular AT vibrating reed.

It can be seen that has impact load limit is difficult to break the rectangular AT vibrating piece increases more you thin inner lead thickness t ₁ As can be seen from FIG.

Also, from the figure, considering that the shock-resistant limit load is 30,000 G or more, the inner lead thickness t ₁ is the thickness of the rectangular AT vibrating piece.
It can be seen that when t ₂ is 120 μm, it may be set to 110 μm or less.

Also, as can be seen from the figure, the rectangular shape when the thickness t ₂ of the AT vibrating piece becomes thin as 40μm from 120 [mu] m, the same inner lead but impact load limit G in the thickness t ₁ is reduced still inner leads can be thickness t ₂ of the rectangular AT vibrating piece to raise the impact critical load G is the same impact load limit G in the case 120μm and thick by reducing the thickness t _1.

Experimentally, in this case, the unit of the impact resistance load G is (×
10 ⁴ G) G = -7.5 log When the shock-resistant limit load G is 30,000 G,
The relationship t ₂ > 4t ₁ −320 holds.

The length l of the rectangular AT vibrating piece is 3600 μm, 4000
[mu] m, 4400Myuemu, was performed in four 4600Myuemu impact critical load is not changed, the impact limit load is confirmed that determined by the thickness t ₂ of the inner lead thickness t ₁ and the rectangular AT vibrating reed Was done.

The inner lead of a normal hermetic terminal is covered with solder, and the composition of the solder is Sn: Pb = 9: 1.The composition of the solder is Sn: Pb = 1: 9, and the inner lead is If weakened stiffness further, a graph of the case where the relationship between the inner lead thickness t ₁ and the impact load limit G changes the thickness t ₂ of the rectangular aT vibrating reed is Figure 8.

It can be seen that has impact load limit is difficult to break the rectangular AT vibrating piece increases more you thin inner lead thickness t ₁ As can be seen in FIG.

The thickness of the inner lead is the same as that of FIG.
The composition of the solder covering the inner leads as compared with t ₁ Sn: Pb = _1: With 9 it can be seen that up in impact critical load.

From FIG. 8, it can be seen that when the shock-resistant limit load is considered to be 30,000 G or more, the thickness t ₁ of the inner lead may be 135 μm or less when the thickness t ₂ of the rectangular AT vibrating piece is 120 μm.

As in the description of FIG. 7, if the unit of the shock-resistant limit load G is experimentally set to (× 10 ⁴ G) in this case, When the shock-resistant limit load G is 30,000 G, the relationship t ₂ > 4t ₁ -420 is established.

Also, as in FIG. 7, the length l of the rectangular AT vibrating piece is
3600μm, 4000μm, 4400μm, was performed in four 4600Myuemu impact critical load is not changed, the impact limit load shall be determined by the thickness t ₂ of the inner lead thickness t ₁ and the rectangular AT vibrating reed Was confirmed.

FIG. 9 is a perspective view showing another embodiment of the hermetic terminal of the present invention.

Another embodiment of the hermetic terminal of the present invention is a metal outer ring 29.
Inside, two lead wires 31 are hermetically sealed via a glass 30 so that the protruding length from the glass 30 is shorter or shorter than the thickness t _{3 of the} lead wire 31 on the inner lead 32 side and the protruding length from the glass 30. the relationship of the thickness T ₃ of long the outer leads 33 of the lead wire 31 There is.

The cross section of the lead wire 31 is not a circle but a rectangle. The present invention is effective for such an airtight terminal.

FIG. 10 is a perspective view showing another embodiment of the rectangular AT vibrator of the present invention.

In another embodiment of the rectangular AT vibrator of the present invention, a rectangular AT vibrating piece 35 on which an electrode 34 is formed by a method such as vapor deposition and a metal plate 36 having a thickness of t ₄ (μm) are used. The end in the longitudinal direction is fixed with an adhesive such as solder 37, and the periphery of the rectangular AT vibrating piece 35 is covered with a container 38.

At this time, if the thickness of the rectangular AT vibrating piece is t ₂ (μm), there is a relationship of t ₂ > 4t ₄ −320 as in the above case. The present invention is also effective with such a rectangular AT vibrator.

〔The invention's effect〕

As described above, according to the present invention, the outer dimension X-axis direction
4.6mm or less, Z 'axis direction 1.5mm or less, Y' axis direction 0.5mm or less
This has the effect that a resonator element can be created.

Further, there is an effect that a rectangular AT vibrating piece having impact resistance can be produced even when the thickness of the crystal piece becomes thin and the strength of the crystal piece becomes weak.

In addition, it has the effect that it can be downsized to a cylinder type with a diameter of 2 mm and a height of 6 mm.

[Brief description of the drawings]

FIGS. 1 (a), 1 (b) and 1 (c) are front, side and elevation views of an embodiment of the hermetic terminal of the present invention, and FIG. 2 is a rectangular shape of the present invention. FIG. 2 is a perspective view showing one embodiment of an AT vibrator. 3 (a), 3 (b) and 3 (c) are a front view, a side view and an elevation view of a conventional hermetic terminal. FIGS. 4 (a), 4 (b), and 4 (c) show the displacement of a rectangular AT vibrating piece when a shock G is applied to a rectangular AT vibrator using a conventional hermetic terminal. FIG. FIGS. 5 (a), 5 (b) and 5 (c) show the displacement of the rectangular AT vibrating piece when an impact G is applied to the rectangular AT vibrator using the hermetic terminal of the present invention. Sectional drawing explaining a situation. FIGS. 6 (a), 6 (b), and 6 (c) show a case in which the impact G is applied to a rectangular AT vibrator without a case using the hermetic terminal of the present invention.
FIG. 9 is a cross-sectional view illustrating a state of displacement of a rectangular AT vibrating reed when “” is added. Figure 7 is a graph showing the relationship between the inner lead thickness t ₁ and the impact load limit G in the case of changing the thickness t ₂ of the rectangular AT vibrating reed. Figure 8 is the composition of the solder is coated inner leads Sn: Pb = 1: 9 and then, inner leads thickness t ₁ and impact critical load in the case of changing the thickness t ₂ of the rectangular AT vibrating reed FIG. FIG. 9 is a perspective view showing another embodiment of the hermetic terminal of the present invention. FIG. 10 is a perspective view showing another embodiment of the rectangular AT vibrator of the present invention. DESCRIPTION OF SYMBOLS 1 ... Metal outer ring 2 ... Glass 3 ... Lead wire 4 ... Inner lead 5 ... Outer lead 6 ... Electrode 7 ... Rectangular AT vibrating piece 8 ... Airtight terminal 9 ... Lead wire 10 ... Inner lead 11 Solder 12 Case 13 Metal outer ring 14 Glass 15 Lead wire 16 Inner lead 17 Outer lead 18 Airtight terminal 19 Inner lead 20 Rectangular AT vibrating piece 21… Case 22… Airtight terminal 23… Inner lead 24… Rectangular AT vibrating piece 25… Case 26… Airtight terminal 27… Inner lead 28 …… Rectangular AT vibrating piece 29… Metal outer ring 30 Glass 31 Lead wire Inner lead 33 Outer lead 34 Electrode 35 Rectangular AT vibrating piece 36 Metal plate 37 Solder 38 Container

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-68007 (JP, A) JP-A-64-809 (JP, A) JP-A-54-116191 (JP, A) JP-A-54-116191 92090 (JP, A) Japanese Utility Model Showa 62-71918 (JP, U) Japanese Utility Model Showa 62-32627 (JP, U) Japanese Utility Model Showa 57-133118 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) H03H 9/00-9/215 H03H 9/54-9/60 H03H 3/00-3/04

Claims (5)

(57) [Claims] 1. A rectangular AT resonator in which an electrode at an end of a rectangular crystal piece cut by an AT cut is connected to two lead wires penetrating an airtight terminal, and the crystal piece is sealed in a case. In the above, while the outer lead of the lead wire is formed in a circular cross section, the thickness of the inner lead at a portion connected to the electrode is 2/3 or less of the thickness of the outer lead. A flat portion is formed on the substrate, and the flat portion is connected to the electrode. The thickness of the crystal piece of the electrode portion is t ₂ (μm), and the thickness of the flat portion of the inner lead is t ₁ (μm). Sometimes t ₂ >
A rectangular AT vibrator satisfying the relationship of 4t ₁ -320. Wherein the thickness t ₁ of the flat portion of the inner lead 11
2. The rectangular AT vibrator according to claim 1, wherein the thickness is 0 μm or less. 3. A rectangular AT resonator in which an electrode at the end of a rectangular crystal piece cut by an AT cut is connected to two lead wires penetrating an airtight terminal, and the crystal piece is sealed in a case. In the above, while the outer lead of the lead wire is formed in a circular cross section, the thickness of the inner lead at a portion connected to the electrode is 2/3 or less of the thickness of the outer lead. A flat portion is formed on the flat portion, and the flat portion is connected to the electrode. The surface of the flat portion is covered with solder having a composition ratio of approximately Sn: Pb = 1: 9. When the thickness of the piece is t ₂ (μm) and the thickness of the flat part of the inner lead is t ₁ (μm), t ₂ >
A rectangular AT vibrator satisfying the relationship of 4t ₁ -420. Wherein the thickness t ₁ of the flat portion of the inner lead 13
4. The rectangular AT resonator according to claim 3, wherein the thickness is 5 μm or less. 5. An external dimension of the crystal blank is 4.6 mm in an X-axis direction.
5. The rectangular AT vibrator according to claim 1, wherein the length is 1.5 mm or less in a Z'-axis direction and 0.5 mm or less in a Y'-axis direction.