JPS6246333Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a holding structure for a piezoelectric vibrator, and in particular to a piezoelectric vibrator that is easy to hold, allows for accurate positioning of the piezoelectric vibrator, and allows for a uniform amount of adhesive, etc. Regarding the holding structure.

Conventionally, a structure for holding a crystal iso-piezoelectric vibrator consists of two holding members each having a slit at their tips, placed at a predetermined distance from each other on a substrate with their flat parts facing each other, and a piezoelectric oscillator placed in the two slits. The piezoelectric vibrator and the holding member were fixed by inserting the vibrator and applying adhesive or brazing metal to the slit portion.

By the way, the holding member has a coefficient of thermal expansion with respect to temperature, and expands and contracts depending on the temperature. Therefore, if the plane of the holding member and the surface of the piezoelectric vibrator are perpendicular to each other as in the above structure, stress is constantly applied to the piezoelectric vibrator due to expansion and contraction of the holding member. Therefore, the stress weakens the adhesive force between the piezoelectric vibrator and the holding member, resulting in a decrease in impact resistance and vibration resistance, and furthermore, the deterioration of characteristics due to aging becomes significant.

Further, according to the conventional holding structure described above, it is difficult to position the piezoelectric vibrator to the holding member and control the amount of adhesive, resulting in poor workability, and furthermore, there are large variations in positioning and in the amount of adhesive applied.

The present invention eliminates the drawbacks of the conventional holding structure, and has excellent temperature characteristics, shock resistance, vibration resistance, aging characteristics, and workability, and also eliminates variations in the positioning of the piezoelectric vibrator and the amount of adhesive applied. An object of the present invention is to provide a piezoelectric vibrator holding structure that can eliminate variations in the piezoelectric vibrator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing a piezoelectric vibrator holding structure according to the present invention, and FIGS. 2a and 2b are an enlarged perspective view and a sectional view of the holding member.

In the figure, 1 is a piezoelectric vibrator plate made of crystal or the like, and 2 is an excitation electrode that causes the piezoelectric vibrator plate 1 to vibrate, which is formed on both sides of the piezoelectric vibrator plate 1 by metal vapor deposition or the like. Note that the dotted line indicates an excitation electrode formed on the back surface of the piezoelectric vibrator plate. Further, each excitation electrode 2 is formed with an extraction electrode 2', and the end portion of the extraction electrode 2' provided on the front surface of the piezoelectric vibrator plate 1 is folded back to the back side. 3 is a cage base, 4 is an inner lead that penetrates the cage base 3, and 5 is a flat and conductive holding member, and the inner lead is arranged so that its plane direction is parallel to the plane of the piezoelectric vibrator plate. It is attached to 4. Reference numeral 6 denotes a groove formed by etching on the flat surface of the holding member 5, and is provided for fitting the piezoelectric vibrator plate 1 and for positioning the piezoelectric vibrator plate. In groove 6,
A brazing alloy or conductive adhesive 7 that maintains conduction between the holding member 5 and the extraction electrode 2' of the excitation electrode 2 and fixes the piezoelectric vibrator plate 1 to the holding member 5.
is coated.

Next, the assembly process of the piezoelectric vibrator will be explained.

First, a substantially L-shaped plate having a predetermined thickness is formed by etching or stamping, and then grooves 6 are formed in the flat surface of the plate by etching. The groove 6 is formed by etching so that the outer shape of the groove coincides with the outer shape of a portion of the piezoelectric vibrator plate 1, and the groove 6 also serves as a positioner for the piezoelectric vibrator plate.

Next, the spacing between these holding members 5 is adjusted, and the flat part, especially the groove 6 into which the piezoelectric vibrator plate 1 is fitted, is
are fixed to the inner lead 4 by welding or with a conductive adhesive so that the bottom surfaces of the leads are on the same plane. After that, the cage base 3 is brought down and the holding member 5 attached thereto is kept horizontal, and then a thin layer of brazing alloy or conductive adhesive 7 is applied to the bottom of the groove 6, and then the extraction electrode 2 The piezoelectric vibrator plate 1 is fitted into the groove 6 so that the position of the piezoelectric vibrator plate 1 is at the position of the groove 6. Then, the cage base 3 holding the piezoelectric vibrator plate 1 is gently placed in a furnace, heated to a predetermined temperature and then cooled, and a brazing alloy or conductive adhesive 7 is used to connect the holding member 5 to the piezoelectric vibrator. The piezoelectric vibrator plate 1 is physically fixed to the holding member 5 while electrically connecting it to the extraction electrode 2' of the daughter plate 1.

Figures 3a and 3b are a perspective view and a sectional view of a second embodiment of the present invention. This example is
Protrusions 8 are provided on the flat surface of the holding member 5, and
A groove-based indicator 11 is formed to indicate the fixing position of the piezoelectric vibrator plate 1 . A brazing alloy or conductive adhesive 7 for fixing the piezoelectric vibrator plate 1 is applied to the protrusion 8 . Note that the protrusion 8 and the indicator portion 11 in this embodiment are all formed by etching.

To fix the piezoelectric vibrator plate 1 to the holding member 5,
As mentioned above, the protrusion 8 attached to the inner lead
After placing the piezoelectric vibrator plate 1 on the holding member 5 on which a brazing alloy or conductive adhesive 7 is applied, the extraction electrode 2' is positioned on the protrusion 8, and its outline and instructions are The holding member 5 and the piezoelectric vibrator plate 1 are aligned with each other, heated in a furnace, and cooled.
While electrically connecting the extraction electrode 2' of the
The piezoelectric vibrator plate 1 and the holding member 5 are physically fixed.

FIGS. 4a and 4b are a perspective view and a sectional view showing a third embodiment of the present invention. This example is
Grooves 6 similar to those in the first embodiment are formed on the flat surface of the holding member 5.
is formed, and a holding member 5 is further formed on the flat surface of the groove 6.
A penetrating crescent-shaped hole 9 is formed on the back surface of the holder. 7 is a brazing alloy or conductive adhesive applied to the groove 6. Note that the grooves 6 and holes 9 in this embodiment are all formed by etching.

To fix the piezoelectric vibrator plate 1 to the holding member 5,
As mentioned above, the piezoelectric vibrator plate 1 is fitted into the groove 6 of the holding member 5 which is attached to the inner lead and whose groove 6 is coated with a brazing alloy or conductive adhesive 7.
After positioning the extraction electrode 2' on the groove 6, it is heated in a furnace and cooled to separate the holding member 5 and the piezoelectric vibrator plate 1.
While electrically connecting the extraction electrode 2' of the
The piezoelectric vibrator plate 1 and the holding member 5 are physically fixed. In this fixing process, in this embodiment, excess brazing alloy or conductive adhesive escapes into the hole 9, so it overflows to the surface and adheres to unnecessary parts, such as the surface of the piezoelectric vibrator plate 1. There is no such thing.

Note that in this embodiment, after the piezoelectric vibrator plate 1 is fitted into the groove 6 without applying a brazing alloy or conductive adhesive to the groove 6, the solder is applied from the back side of the holding member 5. The piezoelectric vibrator plate 1 and the holding member 5 may be fixed by pouring a bonding alloy or a conductive adhesive into the holes 9. This not only prevents the brazing alloy or conductive adhesive from adhering to unnecessary parts, but also prevents the brazing alloy or conductive adhesive from adhering between the groove and the piezoelectric vibrator plate. There is also the advantage that the amount is made uniform.

As described above, according to the present invention, the piezoelectric vibrator is adhesively held with adhesive so that its surface is parallel to the plate-shaped holding member, so it can be fixed by applying adhesive or brazing material as in the conventional method. Unlike , the adhesive surface between the holding member and the piezoelectric vibrator does not peel off even if the holding member expands and contracts after the adhesive etc. hardens, and the impact resistance, vibration resistance, and aging characteristics are improved. can be done. In addition, since the adhesive part of the holding member is clearly distinguished from other parts by forming grooves, protrusions, etc., the amount of adhesive etc. applied can be kept constant and reliably applied to a certain area. It is possible to eliminate variations in the coating area.

In addition, the work of holding the piezoelectric vibrator is made extremely simple by simply placing the piezoelectric vibrator on the holding member and placing it in the furnace. By providing an indication mark, it is possible to eliminate errors in the mounting position of the piezoelectric vibrator.

That is, according to the present invention, the characteristics of the crystal resonator can be improved both electrically and mechanically.

[Brief description of the drawings]

The drawings all show embodiments of the present invention, and FIG. 1 is an exploded perspective view showing the first embodiment, and FIG.
Figures a and b are enlarged partial perspective views and sectional views,
Figures a and b are an enlarged partial perspective view and a sectional view showing the second embodiment, and Figures 4 a and b are an enlarged partial perspective view and a sectional view showing the third embodiment. In the figure, 1 is a piezoelectric vibrator plate, 2 is an excitation electrode, 2'
is an extraction electrode, 3 is a retainer base, 4 is an inner lead, 5 is a holding member, 6 is a groove, 7 is a brazing alloy or conductive adhesive, 8 is a protrusion, 9 is a hole, and 11 is an indicator part. .

Claims (1)

[Claims for Utility Model Registration] (1) In a holding structure for a piezoelectric vibrator held on a base and enclosed in a container, a piezoelectric vibrator having a pair of excitation electrodes extending to both left and right sides; comprising a plate-shaped holding member for holding a piezoelectric vibrator, a surface coated with an adhesive substance having a limited area on a flat surface of the holding member, and an instruction mark for positioning to fix the piezoelectric vibrator plate, Holding of a piezoelectric vibrator, characterized in that the excitation electrode and the holding member are electrically connected by bonding the flat part of the piezoelectric vibrator plate using an adhesive substance at the fixed position indicated by the instruction mark. structure. (2) Utility model registration claim No. (1) characterized in that the surface to which the adhesive substance is applied and the instruction mark are formed by grooves formed by engraving on the flat surface of the holding member. A holding structure for a piezoelectric vibrator described in item ). (3) Registration of a utility model characterized in that a projection provided on the flat surface of the holding member and a groove formed by engraving constitute a surface to which the adhesive substance is applied and an instruction mark, respectively. Claims No.
A holding structure for a piezoelectric vibrator described in (1). (4) The piezoelectric vibrator holding structure according to claim (2), wherein a hole is provided inside the groove to penetrate from the front surface to the back surface of the holding member.