JP2001009374A - Surface mounting-type piezoelectric oscillator and sealing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the joint area between a sealing part and a sealing material and restrain the generated leakage by the enlarged area to miniaturize a surface mounting-type piezoelectric oscillator by forming grooves in a sealing part for a retainer base for surface mounting which stores and retains a piezoelectric element and a sealing part between the retainer base and a lid to be arranged on the upper surface of the retainer base. SOLUTION: Grooves 5a, 6a are formed in the sealing part of a retainer base 5 for surface mounting where a storage part for a piezoelectric element 1 is formed and a sealing part between the retainer base 5 and a lid 6 to be arranged on the upper face of the retainer base 5 respectively. At the same time, the grooves 5a, 6a and the sealing parts are filled with a sealing material 7. In this case, the retainer base 5 for surface mounting is formed of an insulating member such as glass or ceramics. However, when an eutectic alloy is used as the sealing material 7, the sealing part is treated by plating, metallizing or any other means so that the sealing material 7 can be welded. Thus it is possible to enlarge the joint area between the sealing parts of the retainer base 5 and the lid 6 and the sealing material 7 and thereby restrain the generated leakage by this enlarged area to achieve the miniaturization of a surface mounting-type piezoelectric element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a surface mount type piezoelectric vibrator. In the present invention, the surface-mounted piezoelectric vibrator includes a surface-mounted piezoelectric resonator and a surface-mounted piezoelectric oscillator.

[0002]

2. Description of the Related Art FIG. 1 is a longitudinal sectional view of a conventional surface mount type piezoelectric vibrator, and FIG. 2 is a top view with a lid removed. The surface mount type piezoelectric vibrator includes a piezoelectric element 1, a surface mount holder base 2 for housing and holding the piezoelectric element 1,
The cover 3 includes a lid 3 located on the surface mounting retainer base 2, a sealing member 4 for sealing the opening of the surface mounting retainer base 2 and the lid 3. In order to seal the opening of the surface mounting retainer base 2 and the lid 3, the opening has a sealing portion 2a having an appropriate width A.

[0003] As home appliances such as portable terminals, digital cameras and digital video cameras have become smaller, and as the speed and amount of information transmission have increased, the size of surface mount type piezoelectric vibrators has been reduced.
Higher frequency and higher precision are required. To reduce the size, the size of the piezoelectric element is reduced, or the width A of the sealing portion is reduced. Since the electrical performance of the piezoelectric vibrator is reduced when the piezoelectric element 1 is reduced, the size of the piezoelectric element 1 and the size of the storage portion are not changed, and only the width A of the sealing portion is reduced, so that the surface mount type piezoelectric vibrator is reduced. It has been considered to reduce the size.

[0004]

When the width A of the sealing portion is reduced, a leak easily occurs at the sealing portion, and it becomes difficult to control the working conditions of the sealing.

[0005] The sealing material is melted while heating the lid at the time of sealing, but the protrusion to the inside or outside due to the variation in the amount of the sealing material 4 cannot be absorbed by the narrow sealing portion, and the protrusion to the inside is poor. Is more likely to occur.

[0006]

SUMMARY OF THE INVENTION A surface mount holder base for housing and holding a piezoelectric element, a piezoelectric element housed and held in the surface mount holder base, and located on the surface mount holder base. In a surface-mount type piezoelectric vibrator having a lid and a sealing material such as a eutectic alloy or a low-melting glass for sealing the lid with the opening of the surface-mounting retainer base, the surface-mounting retainer base and the lid The structure is such that at least one groove is provided in each of the sealing portions.

A step of supplying a sealing material to a groove of a lid having a groove all around the sealing portion, and a step of sealing the groove of the surface mounting retainer base having a groove at a position corresponding to the entire periphery of the sealing portion. A surface mounting type having a step of setting the surface mounting retainer base in correspondence with the stopper, a step of heating the sealing material while pressing the surface mounting retainer base until the sealing material melts, and a step of cooling the surface mounting retainer base while pressing the base. A method of sealing the piezoelectric vibrator or a step of supplying a sealing material to a groove of a surface mounting retainer base having a groove on the entire periphery of the sealing portion, and a groove at a position corresponding to the entire periphery of the sealing portion. A surface mounting type piezoelectric vibration comprising a step of setting a groove of a lid having a shape corresponding to the sealing material, a step of heating the sealing material while pressing the lid until the sealing material melts, and a step of cooling while pressing the lid. This is a method of sealing a child.

[0008]

FIG. 3 is a longitudinal sectional view of a surface mount type piezoelectric vibrator according to the present invention, and FIG. 4 is a top view with a lid and a sealing material removed.

The size of the housing portion of the piezoelectric element 1 in the surface mount holder base 5 is the same as that of the prior art, and the sealing portion with the lid 6 is improved. Grooves 5a and 6a are formed in the sealing portions of the surface mount holder base 5 and the lid 6, respectively, and the sealing material 7 is filled in the grooves and the sealing portions.

The sealing method varies depending on whether the surface-mounting cage base is arranged below or the lid is arranged below, but in the following description, an example in which the surface-mounting cage base is arranged below will be described. . A step of supplying the sealing material 7 to the groove 5a of the surface mounting retainer base 5 having the groove 5a on the entire periphery of the sealing portion, and a groove of the lid 6 having a groove 6a at a position corresponding to the entire periphery of the sealing portion. Setting the sealing material 6a in correspondence with the sealing material 7; heating the sealing material 7 while pressing the lid 6 until the sealing material 7 melts;
Is cooled while pressurizing, so that the sealing material 7 has a volume slightly larger than the volume formed by the grooves 5a and 6a.

The surface mounting retainer base 5 is formed of an insulating member such as glass or ceramics.
When a eutectic alloy is used, the sealing portion is treated by plating or metallizing so that the sealing material 7 can be welded. The lid 6 may be an insulating member such as glass, but in the present embodiment, a metal plate is used for thinning. Groove 5
Although a and 6a are processed by etching, pressing or the like, they can be appropriately determined depending on the material.

When a eutectic alloy such as gold-tin is used for the sealing material 7, it is preferable to use a wire material corresponding to the groove or a material processed by punching such as a press. When a low-melting glass is used as the sealing material, it is preferable that the powder is press-molded and calcined, but it is also possible to supply the paste-like material to the groove 5a by screen printing or the like. As described above, the sealing material 7 has a volume slightly larger than the volume formed by the grooves 5a and 6a, but is set to an amount that does not protrude from the sealing portion.

FIG. 5 is an enlarged cross-sectional view of the sealing portion in consideration of prevention of protrusion of the sealing material into the inside. Grooves 8a, 9a are formed in the sealing portion between the surface mounting retainer base 8 and the lid 9, and a groove 8b is further formed. The sealing material 10 is filled in the grooves 8a and 9a and the sealing portion, but since the groove 8b is provided inside the sealing portion, the sealing material 10 becomes a pool of extra sealing material and prevents the sealing material from protruding into the inside. In.

Although the above description has been made with reference to the example of the surface mount type piezoelectric vibrator, it is needless to say that the present invention can be similarly applied to a surface mount type oscillator in which an electronic component such as an IC is housed in a surface mount holder base. .

[0015]

According to the present invention, at least one groove is provided in each of the sealing portions of the surface mounting cage base and the lid, and the sealing material is filled. Therefore, the sealing portion of the surface mounting cage base or the lid and the sealing material are filled. The bonding area of the piezoelectric vibrator can be increased, and the occurrence of leakage can be suppressed by that much, and the size of the surface mount type piezoelectric vibrator can be reduced. In this embodiment, the mounting area can be reduced to about 70%.

By forming a groove inside the sealing portion to form a pool of the sealing material, it was possible to prevent the sealing material from protruding into the inside, so that groove processing and variations in the amount of the sealing material were possible. And the manufacturing of parts and the management of sealing conditions became easy.

Since a groove is provided in the sealing portion between the surface mounting retainer base and the lid, the sealing material can be easily positioned by the groove.

When the lid is placed below, the guide by the jig when the lid has a smaller outer shape than the surface mount retainer base becomes easy, and the guide by the jig becomes easy even when the lid is thin.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a conventional surface mount type piezoelectric vibrator.

FIG. 2 is a top view with a lid removed.

FIG. 3 is a longitudinal sectional view of a surface mount type piezoelectric vibrator according to the present invention.

FIG. 4 is a top view with a lid and a sealing material removed.

FIG. 5 is an enlarged cross-sectional view of a sealing portion in consideration of prevention of protrusion of the sealing material into the inside;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Cage base for surface mounting 2a Sealing part 3 Lid 4 Sealing material 5 Cage base for surface mounting 5a Groove 6 Cover 6a Groove 7 Sealing material 8 Cage base for surface mounting 8a Groove 8b Groove 9 Cover 9a groove 10 sealing material A width of sealing portion

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Claims (3)

[Claims] 1. A surface mount retainer base for storing and holding a piezoelectric element, a piezoelectric element stored and held in the surface mount retainer base, a lid located on the surface mount retainer base, and a surface. In a surface mount type piezoelectric vibrator that has a sealing material such as a eutectic alloy or low-melting glass for sealing the mounting cage base opening and the lid, the surface mounting cage base and the lid sealing part A surface-mount type piezoelectric vibrator, wherein at least one groove is provided. 2. A step of supplying a sealing material to a groove of a lid having a groove all around the sealing portion, and forming a groove of the surface mounting retainer base having a groove at a position corresponding to the entire periphery of the sealing portion. A step of setting the sealing material corresponding to the sealing material, a step of heating the sealing material base while pressing the surface mounting cage base until the sealing material is melted, and a step of cooling while pressing the surface mounting cage base. A method for sealing a surface-mount type piezoelectric vibrator, characterized by comprising: 3. A step of supplying a sealing material to a groove of a surface mounting retainer base having a groove on the entire periphery of the sealing portion, and forming a lid groove having a groove at a position corresponding to the entire periphery of the sealing portion. A surface mounting type piezoelectric vibrator comprising: a step of setting corresponding to the sealing material; a step of heating the sealing material while pressing the lid until the sealing material melts; and a step of cooling while pressing the lid. Sealing method.