JPH0227676Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of the Invention) The present invention relates to a piezoelectric vibrating component having a piezoelectric element placed on the inner peripheral surface of a cap.

(Prior art and its problems) FIG. 1 is a sectional view of a piezoelectric vibrating component A of a conventional example. In FIG. 1, reference numeral 1 is a cap made of a metal material with the main purpose of electromagnetically shielding a piezoelectric element 2, 2 is a piezoelectric element placed on the inner peripheral surface 3 of this cap 1, and 4 is a cap. Holding members 6 and 7 attached to the opening 5 of the piezoelectric element 2 are lead terminals having one end connected to both electrodes 8 and 9 of the piezoelectric element 2 via lead wires 10 and 11, respectively. The holding member 4 includes a holding plate 12 that directly holds the lead terminals 6 and 7, and an insulating filling member 13. One of the lead terminals 6 and 7 is electrically connected to the cap 1 for grounding. In the piezoelectric vibrating component A having such a structure, the cap 1 is made of a metal material for electromagnetic shielding, but since the entire cap 1 is made of metal, the cap 1
The metal part will be exposed on the outer peripheral surface. Exposure of such metal parts is undesirable in terms of preventing electric shock.

(Purpose of the invention) The purpose of the invention is to prevent electric shock by preventing metal parts from being exposed on the outer peripheral surface of the cap.

(Structure and Effects of the Invention) In order to achieve this purpose, the present invention forms a metal coating on the inner peripheral surface of a cap made of an insulating material, places a piezoelectric element on this metal coating, and , electrodes on both sides of this piezoelectric element are connected to respective lead terminals, and of both the lead terminals, the lead terminal on the ground side is connected to the metal coating. Therefore, according to the present invention, since the metal part for electromagnetic shielding is not exposed on the outer peripheral surface of the cap, it is possible to prevent an electric shock even if the cap is touched.

(Description of Embodiments) Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 2 is a sectional view of the piezoelectric vibrating component B of this embodiment. In FIG. 2, 20 is a cap made of insulating material. A metal coating 22 is formed on the inner peripheral surface 21 of this cap 20. A piezoelectric element 23 is placed on this metal coating 22. Electrodes 24 and 25 on both sides of this piezoelectric element 23
is connected to each lead terminal 2 via lead wires 26 and 27.
8 and 29, respectively. Therefore, of the lead terminals 28 and 29, the ground-side lead terminal 28 is connected to the metal coating 22 via the electrode 24 of the piezoelectric element 23.

The cap 20 is formed with an opening 30 into which the piezoelectric element 23 is inserted. The metal coating 22
The inner peripheral surface 21 of the cap 20 is connected to this opening 30.
It is formed so as to extend to the step portion 31 of. A holding member 32 made of an insulating material for holding the lead terminals 28 and 29 is attached to the stepped portion 31 of the opening 30. A metal coating 34 is formed on the cap-side inner surface 33 of the holding member 32 up to the metal coating 22 formed on the stepped portion 31 of the opening 30 . However, as shown in the plan view of the holding member 32 in FIG.
and the through hole 3 for the lead terminal 29 on the hot line side.
6, a peripheral portion of the latter through hole 36 is formed with a predetermined region 37 remaining. As a result, the lead terminal 29 on the hot line side is attached to this holding member 32.
It is made so that it does not come into contact with the metal coating 34 formed on the surface. With the holding member 32 attached to the cap 20, the metal coating 34 on the side of the holding member 32 is connected to the metal coating 22 on the inner peripheral surface 21 of the cap. The lead terminal 29 on the ground side is connected to the holding member 3
The holding member 32 is in contact with the metal coating 34 on the second side.
be penetrated. According to this embodiment, since no metal portion is exposed on the outer circumferential surface of the cap 20, it is possible to reliably prevent an electric shock from coming into contact with the cap 20.

FIG. 4 is a partially cutaway sectional view of a cap of a piezoelectric vibrating component C according to another embodiment, and parts corresponding to those in FIGS. 2 and 3 are given the same reference numerals.
What should be noted in this embodiment is the holding member 38
However, unlike that shown in FIG. 2, the whole is made of metal material, and the lead terminal 28 on the ground side is directly passed through the through hole 35 of this holding member 38 and attached, and the lead terminal on the hot line side is attached. 29 is inserted into an insulating glass tube or synthetic resin tube 39 in order to prevent an electrical short circuit with this holding member 38, and the lead terminal 29 is inserted into this tube 39. In this embodiment, as in the previous embodiment, even if the outer peripheral surface of the cap 20 is touched, no electric shock will occur.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of an embodiment of the present invention, Fig. 3 is a plan view of the holding member shown in Fig. 2, and Fig. 4 is a sectional view of another embodiment. be. B and C are piezoelectric vibrating parts, 20 is a cap, 21
22 is the metal coating, 23 is the piezoelectric element, 24 and 25 are the electrodes of the piezoelectric element 23, 2
6 and 27 are lead wires, 28 and 29 are lead terminals,
30 is an opening of the cap 20, 32 and 38 are holding members, 33 is a metal coating of the holding member 32, and 39 is an insulating tube.

Claims (1)

[Claims for Utility Model Registration] (1) A metal coating is formed on the inner peripheral surface of a cap made of an insulating material, a piezoelectric element is placed on the metal coating, and electrodes on both sides of the piezoelectric element are placed on the metal coating. A piezoelectric vibrating component, which is connected to each lead terminal, and a ground-side lead terminal of both lead terminals is connected to the metal coating. (2) In the piezoelectric vibrating component according to claim 1 of the utility model registration, the cap has an opening for inserting the piezoelectric element, and the metal coating is formed to extend into the opening,
A holding member made of an insulating material for holding the lead terminal is attached to this opening, and a metal coating is formed on the inner surface of the holding member on the cap side up to the metal coating formed in the opening, With the holding member attached to the cap, connect the metal coating on the holding member side to the metal coating on the inner peripheral surface of the cap, and connect the holding member with the lead terminal on the ground side in contact with the metal coating on the holding member side. A piezoelectric vibrating component made by penetrating the (3) In the piezoelectric vibrating component according to claim 1 of the utility model registration, the cap has an opening for inserting the piezoelectric element, and the metal coating is formed to extend into the opening,
A piezoelectric vibrating component, in which a holding member made of a metal material for holding the lead terminal is attached to the opening, and the ground-side lead terminal is passed through the holding member in contact with the holding member.