JP2000332561A - Package structure of piezoelectric vibrator - Google Patents

Abstract

(57) Abstract: In a package structure for accommodating a piezoelectric vibrator piece having an excitation electrode and a connection electrode provided at one end connected to the excitation electrode, a mounting state of the piezoelectric vibrator piece is provided. The present invention proposes a package structure of a piezoelectric vibrator which makes it easy to determine the quality of a piezoelectric vibrator and has stable performance. A pair of strip-shaped pillows provided on a substrate of a package are arranged so as to be parallel to the longitudinal direction of the substrate, and the inner sides of the strip pillow longitudinal sides with respect to the substrate are each a piezoelectric vibrator. It is arranged so that it is located inside the peripheral edge of the strip, and the outer sides of the long sides of the strip pillow portion with respect to the substrate are located at the same or outside of the peripheral edge of the piezoelectric vibrator piece. The side edges were arranged at positions near one end of the piezoelectric vibrator piece, and the holding electrodes and the strip-shaped pillows were each configured to have the same thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package structure of a surface mount type piezoelectric vibrator, and more particularly to a package structure of a surface mount type piezoelectric vibrator suitable for judging whether or not a mounted state of a piezoelectric vibrator piece is good.

[0002]

2. Description of the Related Art In recent years, as electronic components have been mounted at higher density and surface-mounted electronic components have been widely used, similarly, surface-mounted piezoelectric vibrators have been widely used. 3A and 3B are views showing a conventional package, wherein FIG. 3A is a sectional view and FIG. 3B is an internal structure diagram. In the drawing, reference numeral 1 denotes a substrate formed of ceramic in the shape of a rectangular plate. The substrate 1 has a pair of holding electrodes 2-2 'on one side in the longitudinal direction and one pillow portion 3 on the other side. On the substrate 1, a piezoelectric vibrator piece 4 having excitation electrodes formed on both surfaces and having a pair of leading ends led out at one end is mounted, and the pair of holding electrodes and the leading ends are electrically conductively bonded. After being fixed with the agent 5 and electrically conducting, a cap 6 having a concave cross-sectional shape is covered, and the opening end of the cap 6 and the peripheral edge of the substrate are fixed with a sealant,
The inside of the package of the piezoelectric vibrator is configured to be airtight.

[0003]

It is generally known that the quality of mounting a piezoelectric vibrator piece affects the performance such as shock resistance and vibration resistance. It is necessary to mount each part at a desired position and fix it with a conductive adhesive. However, when the piezoelectric vibrator piece is opaque or translucent, the pillow portion is hidden under the piezoelectric vibrator piece after the piezoelectric vibrator piece is mounted. Or not "
There is a problem that it cannot be easily determined.

[0004]

According to the present invention, there is provided a package structure for cantilevering and storing a strip-shaped piezoelectric vibrator piece having a connection electrode at one end thereof. A pair of holding electrodes are provided at the inner bottom surface end of the package at positions where they contact the connection electrodes of the piezoelectric vibrator piece, and at least a part of the long side edges of the piezoelectric vibrator piece abut at both ends. And two strip-shaped pillows are arranged so that the strip-shaped pillows are parallel to each other with respect to the longitudinal direction of the piezoelectric vibrator piece. It is arranged so as to be located inside the peripheral edge of the vibrator piece, and the outer side of the long side of the strip pillow portion is located at the same or outside of the peripheral edge of the piezoelectric vibrator piece. The end is a piezoelectric vibrator Characterized by being configured to be placed in the same position as the free end portion of the.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIGS. 1A and 1B show an embodiment of a package according to the present invention, wherein FIG. 1A is a front sectional view, and FIG. In the figure, reference numeral 7 denotes a substrate formed of a material such as ceramic or glass into a rectangular plate shape. A pair of holding electrodes 8-8 'is provided on one side surface of the substrate 7 in the longitudinal direction, and a pair of strip-shaped pillows is provided on the other side surface. A piezoelectric vibrator piece 10 having excitation electrodes formed on both surfaces thereof and having a pair of lead-out ends led out at one end, and a pair of holding members 9-9 '. After the electrode and the lead-out end are fixed with a conductive adhesive 11 and are electrically connected, a cap 12 made of ceramics or the like having a concave cross section is put thereon, and the open end of the cap 12 and the peripheral edge of the substrate are sealed. The package is fixed with a sealant so that the inside of the package of the piezoelectric vibrator is airtight.

FIG. 2 illustrates the substrate 7 in the above-described package structure, wherein FIG.
(B) is a top view and (c) is a side view. The broken line portion in the figure is for explaining the mounting position of the piezoelectric vibrator piece 10, and the broken line 13 indicates the outer peripheral edge of the piezoelectric vibrator piece 10. In the figure, the pair of strip-shaped pillow portions 9 and 9 'are arranged so as to be parallel to the longitudinal direction of the substrate, and the inner sides of the longitudinal sides of the strip pillow portion with respect to the substrate are the peripheral edges 13 of the piezoelectric vibrator piece. The longer side located on the inner side and on the outer side is the peripheral edge 1 of the piezoelectric vibrator piece.
3, and the short side end of the strip-shaped pillow portion 3-3 'is arranged at a position close to one end of the piezoelectric vibrator piece 4. Further, the holding electrode 2-2 'and the strip-shaped pillow portion 3-3' are respectively formed by a tungsten metallization method.

In the above embodiment, as shown in FIG. 1, the outer sides of the strip-shaped pillows 9 and 9 'are provided outside the short sides of the piezoelectric vibrator pieces. When the opaque piezoelectric vibrator piece is mounted on the substrate and the state is viewed from above the substrate, a part of the strip-shaped pillow portions 9 and 9 'slightly protrudes on both sides of the piezoelectric vibrator piece. By judging that the slightly protruded width is the same width on both sides, it is possible to judge the quality of the mounting position. As means for discriminating, for example, there are means such as a method based on image recognition and a method based on visual observation.

Although not shown, when the strip-shaped pillow portions 9 and 9 'are provided at positions where the outer side of the strip-shaped pillow portion and the short side of the piezoelectric vibrator piece coincide with each other, It looks like this: The ideal mounting state is that the piezoelectric vibrator piece does not protrude on both sides, and when the mounting position is displaced, a part of the strip-shaped pillow portion 9 or 9 ′ that protrudes slightly on one side of the piezoelectric vibrator piece. The width of the mounting position is shifted from the center of the mounting position. By determining the shift width, the quality of the mounting position can be determined. Therefore, after the piezoelectric vibrator piece is mounted on the substrate, it can be easily determined whether or not the piezoelectric vibrator piece has been mounted accurately at a desired position.

[0009]

According to the package structure of the present invention, it is possible to easily determine whether or not the piezoelectric vibrator is mounted at a desired position by means of visual observation or image recognition. With these effects, it is possible to provide a piezoelectric vibrator always having stable quality.

[Brief description of the drawings]

FIG. 1 is an embodiment of a package structure according to the present invention.

FIG. 2 shows a package substrate according to the present invention.

FIG. 3 shows a conventional package structure.

[Explanation of symbols]

1,7..substrate, 2,2 ', 8,8' .. holding electrode,
3, ... pillow, 4,10, piezoelectric vibrator piece, 5,11
・ Conductive adhesive, 6,12 ・ ・ Cap, 9,9 ′ ・ ・
Strip type pillow

Claims (1)

[Claims] 1. A package structure for cantileverly fixing and storing a strip-shaped piezoelectric vibrator piece having a connection electrode at one end thereof, wherein the piezoelectric vibrator piece is connected to an inner bottom end of the package. A pair of holding electrodes at positions where the stripping pillows are in contact with at least a part of both long side edges of the piezoelectric vibrator piece. The shaped pillows are arranged so as to be parallel to the longitudinal direction of the piezoelectric vibrator piece, and the inner side of the strip pillow longitudinal side is arranged inside the peripheral edge of the piezoelectric vibrator piece, and The strip pillow is arranged so that the outer side of the long side of the pillow is located at the same or outside of the periphery of the piezoelectric vibrator piece, and the short side end of the strip pillow is located at the same position as the free end of the piezoelectric vibrator piece. It is noted that Package structure of the piezoelectric vibrator to.