JPH051147Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a piezoelectric vibrator whose overall thickness can be significantly reduced.

(Technical background of the invention and its problems) In general, piezoelectric resonators are used in large quantities in a wide range of electronic technology fields, and in particular, crystal resonators that use crystal pieces as the piezoelectric material have high frequency stability.
It is widely used as a time and frequency reference source for communication equipment, digital control equipment, etc.

In particular, demand for piezoelectric vibrators has increased in recent years due to the miniaturization and increased functionality of electronic equipment, and the trend toward lower prices and miniaturization has progressed at a rapid pace.As surface mounting technology has progressed, the thickness has become thinner and surface mounting has become possible. A piezoelectric vibrator is desired. For this reason, piezoelectric vibrators have been put into practical use, for example, in which a crystal piece is held on a plate-shaped base and a cover is placed over the crystal piece.

FIG. 3 is a diagram showing an example of such a piezoelectric vibrator, in which a metal holding piece 2 is fixed to a plate-shaped base 1 made of ceramic, and a crystal piece 3 is attached to this holding piece 2.
Hold both ends.

Then, the electrodes formed on the crystal piece 3 are led out from the plate surface of the base 1 through a conductive pattern 4 formed by, for example, metallization processing. A box-shaped ceramic lid 5 with an open bottom is placed over the base 1 to airtightly seal it.

In this way, the ceramic used for the base 1 and the lid 5 has good heat resistance, and if the base 1 and the lid 5 are made of the same material, they have the same coefficient of thermal expansion, which prevents cracking when mounted on a printed circuit board. , damage such as chipping can be prevented.

However, since the thickness of a ceramic container cannot be made very thin, a piezoelectric vibrator having the structure shown in FIG. 3 cannot be used in a card-type electronic device having a thickness of about 0.5 mm, for example.

(Purpose of the invention) This invention was made in view of the above circumstances.
It is an object of the present invention to provide a piezoelectric vibrator that is easy to manufacture and assemble and whose thickness can be significantly reduced.

(Summary of the invention) This invention involves fixing lead plates to both ends of a piezoelectric body with electrodes formed on both sides of the plate, and connecting the leads through a sheet impregnated with an adhesive using a pair of shells with a recess formed in the center. This piezoelectric vibrator is characterized in that the piezoelectric body is hermetically sealed by sandwiching a plate.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to an assembled perspective view shown in FIG. 1 and a side sectional view shown in FIG.

Reference numeral 11 in the figure indicates, for example, a quartz crystal cut at a predetermined angle, formed into a plate shape, and electrodes 11a on both side plate surfaces.
This is a crystal blank plate in which the electrodes 11a are connected to connection electrodes 11b at both ends in the longitudinal direction.

Lead plates 12 made of a thin metal plate, such as nickel silver, are fixed to both ends of this crystal plate 11 and extend outward, and the lead plates 12 are electrically connected to the connection electrodes 11b. ing.

A pair of shells 13 made of a thin metal plate, such as SUS304, are provided on both side surfaces of the lead plate 12, respectively, and have a recess 13a formed in the center of the opposing surfaces.

A through hole 14a is formed in the center between each shell 13 and the lead plate 12, corresponding to the recess 13a of the shell 13, and is impregnated with an adhesive.
For example, a sheet 14 made of glass fiber or the like is interposed, and the lead plate 1 is inserted through this sheet 14.
2 is sandwiched between the shells 13 from both sides and adhered to form an airtight seal.

In this way, when the thickness of the lead plate 12 and the sheet 14 is 0.05 mm, the thickness of the shell 13 can be reduced.
The thickness can be reduced to about 0.5 mm, and the overall thickness after assembly can be reduced to about 1 mm.

Therefore, it is possible to provide a piezoelectric vibrator that can be used in card-type electronic equipment, etc., is easy to assemble, and is inexpensive.

(Effects of the Invention) As detailed above, according to the present invention, it is possible to provide a piezoelectric vibrator that can be extremely thin and can be used in card-type electronic equipment.

[Brief explanation of the drawing]

FIG. 1 is an assembled perspective view showing an embodiment of the present invention. FIG. 2 is a side sectional view of the piezoelectric vibrator shown in FIG. 1. FIG. 3 is a side sectional view showing an example of a conventional thin piezoelectric vibrator. It is a diagram. 11...Piezoelectric element plate, 12...Lead plate, 13...
...Ciel, 14...sheet.

Claims (1)

[Claims for Utility Model Registration] A piezoelectric body with electrodes formed on both side plate surfaces, and a metal body fixed to both ends of the piezoelectric body, each extending outward, and electrically connected to each of the electrodes. a lead plate; a pair of shells made of thin metal plates with a recess formed in the center of opposing surfaces that sandwich the lead plate from both sides of the plate; A piezoelectric vibrator comprising a sheet made of fibers impregnated with an adhesive and having a through hole in the center corresponding to the recess.