JPH0134436Y2 - - Google Patents

Description

[Detailed description of the invention] Field of the invention This invention relates to a terminal plate for a piezoelectric resonator, and in particular,
The present invention relates to an improvement in a terminal plate of a piezoelectric resonator that makes electrical contact with an electrode formed on a piezoelectric resonator element.

Background of the Invention For example, a three-terminal piezoelectric resonator is composed of a piezoelectric resonant element and a terminal plate. The piezoelectric resonant element has an input electrode and an output electrode formed on one main surface, and an entire surface electrode formed on the other main surface. The terminal plate is provided in individual electrical contact with each electrode of the piezoelectric resonant element. Such a terminal plate is desired to be able to make reliable electrical contact with the electrode, and to have sufficient strength so as not to be deformed.

Purpose of the invention Therefore, the main purpose of the invention is to provide a terminal plate for a piezoelectric resonator that can satisfy the above-mentioned needs.

Summary of the invention To summarize this invention, the invention includes a first side extending in the longitudinal direction and parallel to each other, and a second side extending in the transverse direction and parallel to each other, and from one of the second sides to the other. A contact piece is formed to electrically contact the piezoelectric resonant element and extend parallel to the first side, and the contact piece is brought into electrical contact with the electrode of the piezoelectric resonant element. Each outer edge is bent to form a reinforcing portion.

The above objects and other objects and features of the present invention will become clearer from the detailed description given below with reference to the drawings.

DESCRIPTION OF EMBODIMENTS FIG. 1 is an external perspective view of a lead frame 7 included in an embodiment of this invention, FIG. 2 is an external perspective view of a lead frame 7 having a base 8 molded thereon, and FIG. These figures are also perspective views of the common electrode plate 9, FIG. 4 is an exploded perspective view, and FIG. 5 is a perspective view of the assembled unit 100 and case 10.

Next, one embodiment of this invention will be described in detail with reference to FIGS. 1 to 5. The piezoelectric resonator in this embodiment is configured to accommodate one or two piezoelectric resonant elements 4. First, referring to FIG. 1, lead portions 73 and 75 are integrally formed to connect hoops 71 and 72 arranged in parallel. moreover,
The hoop 71 is placed parallel to the lead portion 75.
A lead portion 74 is formed extending from. and,
This lead portion 74 is connected to the aforementioned lead portion 75 by a connecting portion 79. A flat part 731 is drawn out from approximately the center of the lead part 73 in parallel to the hoops 71 and 72, and its tip and lead part 74
A contact portion 76 having a trapezoidal cross section and a flat portion on its upper surface is formed between the contact portion 76 and the tip of the contact portion 76 . Further, a flat portion 722 is pulled out from the other hoop 72, and a contact portion 77 having a width approximately twice that of the contact portion 76 is formed between the tip of the flat portion 722 and the tip of the flat portion 791 extending from the connecting portion 79. be done. Further, a flat portion 723 is pulled out from the hoop 72 , and a flat portion 75 is pulled out from its tip and the lead portion 75 .
A contact portion 78 having the same width as the contact portion 76 is formed at the tip of the contact portion 1 . The contact portion 76 contacts one of the two piezoelectric resonant elements, for example, an input electrode,
The contact portion 77 is for contacting the output electrode of one piezoelectric resonant element and the input electrode of the other piezoelectric resonant element, and the contact portion 78 is for contacting the output electrode of the other piezoelectric resonant element. Note that holes 711 and 721 for positioning are formed in the hoops 71 and 72, respectively.

Next, referring to FIG. 2, a base 8 is formed by molding an insulator such as synthetic resin onto the lead frame 7 shown in FIG. 1 described above. The base 8 has a box-like shape with an open top, and includes a space 81 formed so that the top surfaces of the contact portions 76 to 78 are exposed. This space 81 is for accommodating the two piezoelectric resonant elements 4, 4. Protrusions 82, 83, and 84 are formed to surround the center portion of space 81. These protrusions 82 to 84 are for positioning the piezoelectric resonant element 4 and the anisotropically conductive rubber sheet 3. Furthermore, fitting portions 85 and 86 are formed on both side walls of the base 8 to which a common electrode plate 9, which will be described later, is attached.

Next, the common electrode plate 9 will be explained with reference to FIG. A lead portion 92 extends from the hoop 91.
is formed, and its tip 93 is bent and connected to a frame 94. The frame 94 consists of two sides 941, 942 extending parallel to the longitudinal direction and two sides 943, 944 that intersect both ends of these two sides 941, 942 and connect them, respectively. One side 943 is parallel to the sides 941 and 942 extending in the longitudinal direction, and
Two strip-shaped contact pieces 95 and 96 are formed extending from the top. These contact pieces 95 and 96 are in electrical contact with the entire surface electrodes 44 and 44 of the two piezoelectric resonant elements 4 and 4, respectively, and the sides 943
Bends slightly downward at the base. Further, the outer edges of the two longitudinally extending sides 941, 942 are bent downward to form reinforcing portions 945, 946, which are the feature of this invention. These reinforcing portions 945, 946 are such that the contact pieces 95, 96 are connected to the entire surface electrodes 44, 44 of the piezoelectric resonant elements 4, 4.
When pressed and brought into contact with each other, the frame 94
An upward force acts on the contact pieces 95 and 96 to prevent the longitudinal sides 941 and 942 at the base portions from bending. In addition, the reinforcing portions 945, 9
46 can be formed only on the outer edges of the longitudinal sides 941, 942 corresponding to the root portions of the contact pieces 95, 96 to obtain the same effect. Further, claw members 97 and 98 are formed so as to face downward from the outer edges of sides 943 and 944. The claw members 97 and 98 are fitted into the fitting parts 85 and 86 formed on the base 8 described above, and the common electrode plate 9
This is for fixing to the base 8.

Next, an assembly method will be explained with reference to FIGS. 1 to 4. First, the lead portion 74 and the connecting portion 79 are cut along the dashed-dotted line A shown in FIG. 1, and the hoop 72 is cut along the dashed-dotted line B. As shown in FIG. The anisotropically conductive rubber sheet 3 is placed on the part surrounded by the protrusions 82 to 84 of the base 8, and the two piezoelectric resonant elements 4, 4 are placed in parallel. Therefore, each piezoelectric resonant element 4
The input electrode 41 and the output electrode 42 are connected to the contact portion 76 of the lead frame 7 via the anisotropically conductive rubber sheet 3.
to 78 individually and electrically. Furthermore, the common electrode plate 9 is placed on the base 8. At this time, the claw members 97 and 98 are fitted into the fitted parts 85 and 86 of the base 8. By fixing the common electrode plate 9 to the base 8 using the claw members 97 and 98, the contact piece 9 of the common electrode plate 9
5, 96 necessarily represent each piezoelectric resonant element 4, 4
It comes into electrical contact with the entire surface electrodes 44, 44 of.

By cutting the lead part 74 and the connecting part 79, each contact part 76, 77, and 78
Since they are electrically independent, the two piezoelectric resonant elements 4, 4 are connected in series. Further, a case having an opening 101 on one side is prepared, and the case 10 is placed so as to cover the unit 100 from this opening 101.
Then, resin is injected from the opening 101 side, unit 100 and case 10 are integrated, and finally hoops 71 and 91 are separated.

Note that the unit 100 may be molded, for example, with synthetic resin, without providing the case 10. In this case, it is necessary to prevent the synthetic resin from entering the space 81 of the base 8.

As described above, since the reinforcing portions 945 and 946 are formed on the external edges of the two sides 941 and 942 extending in the longitudinal direction of the common electrode plate 9, the contact pieces 95 and 9
6 is the whole surface electrode 44 of the piezoelectric resonant element 4, 4,
44, the two sides 9
41,942 will never bend.

FIG. 6 is an external perspective view of a unit 100 housing only one piezoelectric resonant element. This ninth
In the example shown in the figure, only one piezoelectric resonant element 4 is housed within the base 8, and the piezoelectric resonant element 4 is configured as a one-element type. i.e. space 8 of base 8
One piezoelectric resonant element 4 is housed only on one lead portion 73, 75 side. Then, the connecting portion 79 of the lead frame 7 shown in FIG. 1 is cut along the dashed line C. Therefore, the lead portion 73 may be electrically connected to the input electrode 41 of the piezoelectric resonant element 4, and the lead portion 75 may be connected to the output electrode 42. Then, the lead part 7
3 and 74 are input electrode 42 and output electrode 43, respectively.
will be connected to.

FIG. 7 is an exploded perspective view of another embodiment of this invention. In the embodiment shown in FIG. 7, this invention is applied to a piezoelectric resonator having one two-terminal type piezoelectric resonant element 300. One electrode plate 200 has a lead portion 20 extending from the hoop 201.
2, the tip of which is connected to a frame 203. The frame 203 is constructed in substantially the same manner as the common electrode plate 9 shown in FIG.
is formed. However, in this embodiment, only one piezoelectric resonant element 300 is stored, so one
Only one contact piece 206 is provided. Further, the claw members 205 are formed so as to face downward from the reinforcing portions 204, 204 formed in the longitudinal direction of the frame 203, two on each side.

The piezoelectric resonant element 300 is a piezoelectric unit 30
One electrode 302 and the other electrode 30 on both main surfaces of 1.
It is a two-terminal type in which 3 is formed. base 220
is a space 2 that is open on both the top and bottom surfaces.
21, and a piezoelectric resonant element 300 on the inner wall.
a plurality of protrusions 22 for positioning the storage position of the
2... is formed. Further, fitted portions 223 and 22 are provided on the outer side wall along the longitudinal direction of the base 220.
3 is formed.

The other electrode plate 230 includes a lead portion 232 extending from a hoop 231, and a flat portion 23 at the tip thereof.
3 is formed. The center portion of the flat portion 233 has a flat portion on its upper surface, and a contact portion 234 is formed for the flat portion to come into contact with the other electrode 303 of the piezoelectric resonant element 300 . Furthermore, the electrode plate 23
Claw members 235 are provided on both side edges along the longitudinal direction of 0.
235 is formed. These claw members 235,2
35 is a fitted portion 22 formed on the base 220
3,223.

Next, the assembly method of this embodiment will be explained. First, the claw members 235, 235 of the other electrode plate 230 are fitted into the fitted portion 223 of the base 220. Then, the contact portion 234 of the other electrode 230
An anisotropically conductive rubber sheet 210 is placed on top. Then, the piezoelectric resonant element 300 is housed in the space 221 of the base 220 so that the other electrode 303 is in contact with the anisotropically conductive rubber sheet 210. Furthermore, one electrode plate 200 is attached from above. At this time, the claws 205 of the electrode plate 200 are engaged with the side walls of the base 220. At this time, the contact piece 206 is connected to the entire surface electrode 4 of the piezoelectric resonant element 4.
4, the reinforcing portion 204 is formed on the outer edge of the frame 203, so that the frame 203 can be prevented from bending.

Effects of the invention As described above, according to this invention, since a reinforcing portion is formed on the outer edge of one side parallel to the contact piece,
Even if the contact piece is pressed into contact with the electrode of the piezoelectric resonant element, one flat side can be prevented from bending, the contact piece can be reliably brought into electrical contact with the piezoelectric resonant element, and automatic assembly is possible. becomes easier.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a lead frame included in an embodiment of this invention. FIG. 2 is an external perspective view of a lead frame having a molded base. FIG. 3 is a perspective view of the appearance of the common electrode plate. FIG. 4 is an exploded perspective view of an embodiment of this invention. FIG. 5 is an external perspective view of the assembled unit and case. FIG. 6 is an external perspective view of a unit housing only one piezoelectric resonant element. FIG. 7 is an exploded perspective view of another embodiment of this invention. In the figure, 4,300 is a piezoelectric resonant element, 41 is an input electrode, 42 is an output electrode, 43 is a full surface electrode, 7 is a lead frame, 73, 74, 75
are lead parts, 76, 77, 78 are contact parts, 79 are connection parts, 8, 220 are bases, 85, 86, 22
3 is a fitted part, 9 is a common electrode plate, 92 is a lead part, 94 is a frame, 941, 942 are longitudinal sides, 95, 96 are contact pieces, 97, 98 are claw members, 10 is a case, 200 is one electrode plate, 2
20 indicates the other electrode plate.

Claims (1)

[Claims for Utility Model Registration] A terminal plate electrically contacting the electrodes of a piezoelectric resonant element and having an external lead-out terminal formed thereon, the first sides extending in the longitudinal direction being parallel to each other, and the short sides extending in the transverse direction. and second sides, each of which is parallel to the other, extending parallel to the first side from one of the second sides to the other, and electrically contacting the piezoelectric resonant element. A terminal plate for a piezoelectric resonator, wherein a piece is formed, and a reinforcing portion is formed by bending an outer edge of the first side.