JPH0546122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of crystal oscillators and other piezoelectric oscillators used in wristwatches and the like.

The gist of the present invention is to use piezoelectric oscillation pieces of different sizes by modifying the inner leads of the plug body, thereby making it possible to manufacture the plug body using a common plug body and cylindrical case. Therefore, an object of the present invention is to make the plug body and cylindrical case common without sacrificing mechanical properties such as impact resistance and vibration resistance, thereby reducing the number of parts and simplifying the process. Our goal is to provide affordable piezoelectric vibrators.

As an example of a conventional piezoelectric vibrator, a conventional example of a tuning fork type crystal vibrator is shown in a plan cross-sectional view in FIG. Figure A shows a plug body 4 formed by hermetically sealing a lead terminal 3 consisting of an inner lead 1 and an outer lead 2, and a tuning fork crystal oscillator with a base 5 fixed to the tip of the inner lead 1. Piece 6
and a cylindrical case 7 in which the tuning fork crystal oscillator piece 6 is vacuum-sealed by vacuum sealing with the plug body 4. In the tuning fork type crystal resonator 200 of the same configuration shown in FIG. . As shown in the figure, the conventional tuning fork type crystal oscillators 100, 200 have other components, depending on the size of the tuning fork type crystal oscillator pieces 6, 12.
That is, plug bodies 4, 11 and cylindrical cases 7, 13 are used.

As described above, in the configuration of the conventional tuning fork type crystal resonator, it has become difficult to meet the low price competition of wristwatches, calculators, etc. by simply reducing the unit cost of each component. For example, in FIG. 1A, the base width W _A of the tuning fork type crystal oscillator piece 6 is 1 mm, and the leg length L _A is 4.16 mm.
When , the outer diameter D _A of the cylindrical case 7 is 2 mm, and the body length H _A
is 6 mm, and in Figure B, when the base width W _B of the tuning fork type crystal oscillator piece 12 is 0.64 mm and the leg length L _B is 3.46 mm, the outer diameter D _B of the cylindrical case 13 is 1.50 mm, and the body length H _B
The size of the tuning fork type crystal oscillator pieces 6, 12 differs depending on the size of the tuning fork type crystal oscillator pieces 6, 12, and the components are low in price. Therefore, as mentioned above, it is difficult to provide a low-priced piezoelectric vibrator only by making efforts to reduce the unit cost of each component. Therefore, it is possible to realize lower prices by standardizing parts. However, if components are standardized while maintaining the conventional component structure, the following problems will occur. In other words, it goes without saying that it is impossible to attach a tuning fork-shaped crystal oscillator piece with a narrow base width to a plug body with a wide interval between inner leads.
When a tuning fork crystal oscillator piece with a wide base is attached to a plug body with narrow inner lead spacing, the tuning fork crystal oscillator piece becomes heavy, but the spacing between the inner leads that support it remains narrow, so the inner leads However, a problem arises in that the torsional vibration and vibration in the width direction of the tuning fork type crystal oscillation piece cannot be sufficiently prevented. Such vibration of the tuning fork type crystal oscillator piece causes a decrease in the frequency characteristics of the tuning fork type piezoelectric vibrator, which is undesirable.

In view of the above problems, the present invention aims to realize sharing of component parts, reduce the number of parts owned, and simplify the process without deteriorating the mechanical properties of a tuning fork type piezoelectric vibrator. An embodiment of a tuning fork type crystal resonator is shown in FIG. 2 as a cross-sectional plan view, with its configuration as an example of a piezoelectric resonator. In the figure, the present invention includes a plug body 17 formed by hermetically sealing a lead terminal 16 consisting of an inner lead 14 and an outer lead 15;
A tuning fork type crystal oscillator piece 19 that has a base 18 fixed to the tip of the tuning fork type crystal oscillator piece 4, and a cylindrical case 20 that vacuum-seals the tuning fork type crystal oscillator piece 19 by vacuum sealing with the plug body 17. crystal oscillator 300
The base width W of the tuning fork crystal oscillator piece 19 vacuum-sealed by the cylindrical case 20 is smaller than the distance S between the outer ends of the plug body fixed end surface 21 of the inner lead 14. Inner lead tip 22 fixed to oscillation piece 19
is a tuning fork type crystal oscillator characterized by the above structure, in which the spacing is narrow toward the tip side, and the plug body is fixed with a spacing narrower than the distance S between the outer ends on the fixed end surface 21. be. In this example,
The plug body 17 and the cylindrical case 20 are shown in FIG.
The one shown in the conventional example is used, and the tuning fork type crystal oscillation piece 19 shown in FIG. 1B is used. In the embodiment of the present applicant, the inner lead 1 at the fixed end surface of the plug body when the base width of the tuning fork type crystal oscillation piece 19 is 0.64 mm and the wire diameter of the lead terminal 16 is 0.18 mm.
The distance S between the outer edges of 4 is designed to be 0.83 mm.
In order to fix the inner lead 14 to the base 18 of the tuning fork crystal oscillation piece 19, the distal end 22 of the inner lead 14 is directed toward the distal end side so that the spacing is narrow, and the distance S between the outer ends of the inner lead 14 on the plug body fixed end face 21 is set.
As a method for forming a narrower range, the plug itself can be easily bent using a dedicated device. By forming this bending, the tuning fork type crystal oscillator pieces 6 and 12 of different sizes shown in FIGS. Configure. Furthermore, when fixing a tuning fork type crystal oscillation piece 19 having a narrow base width, by arranging the tuning fork type crystal oscillation piece 19 closer to the tip side, the alignment margin is secured and the fixation is performed. Here, inner lead 1
Since the distance between 4 is continuously narrowing to the tip,
The tuning fork type crystal oscillator piece 19 that can be fixed to the inner lead 14 having a fixed shape has a wide base width range. Also,
The tuning fork type crystal oscillation piece 19 is a tuning fork type crystal oscillation piece 19.
Since the distance between the inner lead 14 and the fixed end face 21 of the plug body is ensured to be as wide as possible, the vibration resistance characteristics of the tuning fork type crystal oscillation piece 19 are not sacrificed. Moreover, since the inner leads 14 are bent in different directions, even if an impact is applied to the cylindrical case 20 from the side, the movement of one inner lead 14 will not be followed by the other inner lead 14, so the tuning fork type Vibration of the crystal oscillation piece 19 in the width direction is reliably prevented.
Further, the inner lead 14 is connected to the inner lead 1
4. Inflection part and tuning fork type crystal oscillator piece 19 for narrowing
Since the tuning fork type crystal oscillation piece 19 can be installed at a position close to the plug body fixed end face 21, the inner part between the tuning fork type crystal oscillation piece 19 and the plug body fixed end face 21 is not bent between the tuning fork type crystal oscillation piece 19 and the plug body fixed end face 21. lead 14
The length of can be minimized. Therefore, torsional vibration of the tuning fork type crystal oscillator piece 19 is also reliably prevented. Further, the inner lead 14 is disposed obliquely on the base 18 of the tuning fork type crystal oscillation piece 19.
Therefore, since the overlapping length between the inner lead 14 and the tuning fork type crystal oscillator piece 19 is long, a large fixing area can be ensured, resulting in high fixing strength. Note that the shape of the inner lead 14 is such that the spacing is narrow toward the distal end side, and if the spacing is narrower than the distance between the outer ends of the inner lead 14 on the plug body fixed end surface 21, the shape is as shown in FIGS. 3A to D. The shape of the tip of the inner lead 14 may be as shown in FIG.
In order to ensure a wider fixing area, the
As shown in D, it is also effective to provide an area larger than the diameter of the inner lead wire for fixation. The above configuration can also be easily formed as a single plug using a dedicated device.

As described above, in the piezoelectric vibrator according to the present invention, a gap adjusting part in which the lead gap is continuously narrowed is formed on the tip side of the inner lead, and the lead gap in this gap adjusting part is approximately equal to the base width. Since the tuning fork type piezoelectric oscillator piece is fixed to the tip side from the position shown in FIG.

Since a piezoelectric oscillation piece with a small base width can be fixed to a plug body used for piezoelectric vibrators of other sizes, it is possible to use a common plug body and case. Moreover, since the distance between the leading ends of the leads is continuously narrowed toward the leading end, the range of the base width of the piezoelectric oscillating piece that can be fixed is wide.

Since the lead tip overlaps diagonally with respect to the piezoelectric oscillation piece, there is a wide overlap margin. Therefore, even for a piezoelectric oscillation piece with a small base width, a wide fixing area can be ensured, and the fixing strength is high.

The inner lead is fixed from both ends of the base to the oscillating piece of any base width, and the lead interval between the vibrator and the plug body is ensured as wide as possible, so tuning fork type piezoelectric vibration The impact resistance properties of the child are ensured. Moreover, since the inner leads are oriented in different directions, the movement of one lead does not follow the movement of the other lead in the same way. Therefore, vibration in the width direction of the tuning fork type piezoelectric oscillator piece is less likely to occur. In addition, since there is no deformed part between the deformed part that narrows the width of the inner lead and the piezoelectric oscillation piece, the lead length between the piezoelectric oscillation piece and the fixed end surface of the plug body is minimized. Torsional vibration of the piezoelectric oscillation piece is also less likely to occur.

[Brief explanation of the drawing]

FIGS. 1A and 1B are plan sectional views showing a conventional example of a tuning fork type crystal resonator. FIG. 2 is a plan sectional view showing an embodiment of the tuning fork type crystal resonator of the present invention. Figure 3 A-D
is a front view showing the shape of the inner lead. FIGS. 4A to 4D are front views showing the shape of the tip of the inner lead. 14... Inner lead, 15... Outer lead, 16... Lead terminal, 17... Plug body,
18...Base of tuning fork type crystal oscillator piece 19, 20...
Cylindrical case, 21...Fixed end surface of plug body 17,
22...Tip of the inner lead 14, W...Width of the base 18 of the tuning fork crystal oscillator piece 19, S...Distance between the outer ends of the inner lead 14 on the fixed end surface 21 of the plug body 17.

Claims (1)

[Claims] 1. A plug body formed by hermetically sealing two linear lead terminals consisting of an inner lead and an outer lead, and a tuning fork type piezoelectric oscillator piece whose base is fixed to the side surface of the tip of the inner lead;
In a piezoelectric vibrator comprising a cylindrical case that vacuum-seals the tuning fork-type piezoelectric oscillator piece with the plug body, the inner lead has a lead interval on the tip side that is continuous toward the tip side. The width of the base of the tuning fork piezoelectric oscillator piece is such that the lead spacing at the tip of the inner lead is equal to the width of the base. A piezoelectric vibrator characterized in that the piezoelectric vibrator is fixed from the bent position to the tip side.