JPH0821829B2 - The shape of the crystal vibrating piece supporting lead of the thickness-slip quartz crystal unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to the shape of a crystal vibrating piece supporting lead of a thickness-shearing quartz crystal resonator.

[Conventional technology]

Conventionally, the shape of the support lead that supports the crystal vibrating piece of the thickness-sliding crystal resonator is flat, cylindrical, etc.
Various are known.

The shape of the lead will be known depending on the relative position of the crystal vibrating piece with respect to the two leads and the method of fixing the crystal oscillator and the lead. FIG. 4 and FIG. 5 show a typical support structure of the crystal vibrating piece support portion of the thickness-sliding crystal resonator. FIG. 4 is a view of the supporting portion viewed from the axial direction of the lead. (1) and (1 ') are leads, (2) is a crystal vibrating piece, and (3).
(3 ') is solder. FIG. 5 is a front view of the supporting portion when FIG. 4 is a plan view, and (4) is a lead (1)
A hermetic part that holds (1 ') fixed, (5)
Is an electrode. The leads (1) and (1 ') have a solid cylindrical shape and project from the hermetic portion (4). The crystal vibrating piece (2) is supported by the leads (1) (1 ') with solder (3) (3') so that the long sides of the rectangle shown in FIG. 4 are in contact with the leads (1) (1 '). Has been done. The electrode (5) is formed on the thickness-shear vibrating surface of the crystal vibrating piece (2) by a method such as vapor deposition and plating, and it is natural that the electrode (5) is formed on both the thickness-sliding surface. .

[Problems to be Solved by the Invention]

In the conventional typical supporting structure, the crystal vibrating piece (2) is sandwiched between the leads (1) and (1 '), and therefore the supporting strength is several times that of a supporting method such as cantilever supporting. However, due to its strength, it has low impact resistance and is weak against impact in the vertical direction of the drawing of FIG.

In order to overcome the above drawbacks, there has been devised a method in which the leads (1) and (1 ') are flattened to improve the impact resistance in the tilting direction. The structure is shown in FIG. FIG. 6 is a view seen from the same direction as FIG. 4, and shows the lead (1).
(1 ') is flattened into the leads (6) and (6'). (7) is a crystal vibrating piece, and (8) and (8 ') are solders. When the structure as shown in FIG. 6 is employed, the leads (6) and (6 ') are bent in response to the force in the above-mentioned direction, so that the impact resistance is remarkably improved. However, in the case of the structure as shown in FIG. 6, the thickness of the crystal vibrating piece (7) and the lead (6)
It becomes necessary to adjust the interval of (6 ') well. This is because in a thickness-sliding quartz crystal resonator, the frequency is determined by the thickness of the quartz crystal vibrating piece. It is a difficult task to accurately adjust the distance between the leads (6) and (6 ') for each frequency.

Further, the solder (3) (3 ') shown in FIG. 4 requires more than the minimum amount for fixing the crystal vibrating piece (2) to the leads (1) (1') and measuring the electrical connection. is there. because,
When the amount of the solder (3) (3 ') is small, the solder spreads thinly around the leads (1) (1') due to the surface tension when melted, and the crystal vibrating piece (2) and the leads (1) (1). This is because the void in the contacting portion of ′) cannot be completely filled as shown in FIG. 4, and even if the electrical connection is removed, the mechanical strength is insufficient.

Moreover, the lead pitch shown in FIG. 4 must be accurate. This is because if the pitch is too wide, the leads (1) and (1 ') will not be soldered well to the electrodes (5) shown in FIG.

[Means for solving the problem]

In the present invention, in order to overcome the drawbacks of the conventional crystal vibrating piece supporting lead shape, in the thickness sliding crystal vibrating piece which supports the thickness sliding crystal vibrating piece by sandwiching it with the two rod-shaped leads, it is better than The two protruding rod-like leads have a curvature corresponding to 3 to 6 times their own diameter when viewed from the axial direction of the rod-like leads, and have a thickness of 1/3 to 1/6 of their own diameter. The present invention provides a shape of a crystal vibrating piece supporting lead of a thickness-sliding quartz crystal resonator, which is characterized by having an arc-shaped portion.

[Example] A typical example of the present invention will be described with reference to Figs. FIG. 1 is a view of the embodiment seen from the same direction as FIG. 4, in which (9) and (9 ') are leads, and (10).
The crystal vibrating element (11) (11 ') is solder. FIG. 2 is a front view of FIG. 1, in which (13) is a hermetic portion for fixing and holding the leads (9) and (9 '), and (12) is an electrode. In the leads (9) and (9 '), the tips of rod-shaped leads are crushed in an arc shape, and the curvature thereof is equivalent to several times the original diameter. The thickness of the arc-shaped portion is a fraction of the original diameter. Since the leads (9) and (9 ') are thin, the amount of elastic deformation or plastic deformation due to the force exerting on the crystal piece in the vertical direction in the drawing of FIG. 1 is larger than that of the conventional typical support structure. Since it can absorb the impact due to deformation, it has high impact resistance.

Further, since the leads (9) (9 ') have an arc shape with a large curvature, it is not necessary to adjust the interval for each frequency. This will be described in detail with reference to FIG. FIG. 3 shows the fourth
The figure shows a crystal vibrating element (10) with thick (14) and thin (1)
5) The lead (9) (9 ') and the crystal vibrating piece (1
4) It shows the relationship with (15). Even if the thickness of the crystal piece changes, the leads (9) (9 ') and the crystal vibrating piece (1
4) The tangent to (15) does not fluctuate extremely in the longitudinal direction of the crystal pieces (14) (15) in the figure. Therefore, the drawbacks of the conventional flat smoldered leads (6) (6 ') can be overcome.

Further, in FIG. 1, the gap between the leads (9) (9 ') and the crystal vibrating piece (10) is the lead (1) in FIG.
It is clearly smaller than the gap between (1 ') and the crystal vibrating piece (2), which is the solder (11) required to obtain the same solder strength.
It means that the amount of (11 ') is small.

〔The invention's effect〕

The shape of the crystal vibrating piece supporting lead of the thickness-sliding quartz crystal vibrator according to the present invention does not need to change the lead shape even if the thickness of the crystal vibrating piece changes a little, and the lead and the crystal piece are fixed with a small amount of solder. The effect is that you can do it.

[Brief description of drawings]

 FIG. 1 ... Typical embodiment of the present invention (9) (9 ') ... Lead (10) ... Crystal vibrating piece (11) (11') ... Solder FIG. 2 ... Front view of FIG. (9) (9 ') …… Lead (10) …… Crystal vibrating piece, (12) …… Electrode (13) …… Hermetic part Fig.3… Relationship diagram between crystal vibrating piece and lead (9) (9 ′) Lead (11) (11 ′) …… Solder (14) …… Crystal vibrating piece (thickness) (15) …… Crystal vibrating piece (thin) Fig. 4… Support structure diagram of crystal vibrating piece support (1) (1 ') ... Lead, (2) ... Crystal vibrating piece (3) (3') ... Solder Fig.5 Front view of Fig.4 (1) (1 ') ... Lead, (2) …… Crystal vibrating piece (3) (3 ′) …… Solder (4) …… Hermec part, (5) …… Electrode Fig.6 ... Support structure diagram of crystal vibrating piece supporting part (6) (6) ′) …… Lead, (7) …… Crystal vibrating piece (8) 8 ') ...... solder

Claims (1)

[Claims] 1. A thickness-shearing quartz crystal vibrating piece which sandwiches a thickness-sliding quartz crystal vibrating piece by means of two rod-shaped leads, wherein the two rod-shaped leads projecting from the hermetic portion are axial directions of the rod-shaped leads. It has a curvature equivalent to 3 to 6 times its own diameter, and
A shape of a crystal vibrating piece supporting lead of a thickness-sliding quartz crystal resonator having an arc-shaped portion having a thickness of 1/3 to 1/6.