JPH0141276Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a piezoelectric electroacoustic transducer using a piezoelectric element, and relates to a structure for supplying electricity to the piezoelectric element.

[Prior Art] An example of this type of piezoelectric electroacoustic transducer is one having a structure shown in Japanese Utility Model Publication No. 59-34239.

This will be explained below with reference to FIGS. 4, 5, and 6.

Figure 4 shows the bottom view of the piezoelectric vibrator.
is a vibrating substrate made of metal material, and this vibrating substrate 1
A recess is formed in the center so that the peripheral edge thereof protrudes from the center, and one electrode 3a of the piezoelectric element 2 is attached to this recess. This one electrode 3a and the vibration substrate 1 are electrically connected.
An insulating layer 4 is formed on a portion of the peripheral edge of the vibrating substrate 1 and a portion extending from this portion to the piezoelectric element 2, and a conductive layer 5 is formed on this insulating layer 4 so as not to come into contact with the vibrating substrate 1. A portion is connected to the other electrode 3b of the piezoelectric element 2. The conductive layer 5 is formed by means such as conductive printing.

FIG. 5 shows a plan view of the terminal board, in which two half-printed arc-shaped first and second conductive patterns 7a and 7b are formed on one side of the terminal board 6. 1. Second conductive patterns 7a, 7b
are connected to the first and second terminals 8a and 8b, respectively.

Then, the piezoelectric vibrator and the terminal plate 6 are overlapped, and the first conductive pattern 7a and the peripheral part of the vibrating substrate 1 where the conductive layer 5 is not formed, and the second conductive pattern 7b and the conductive layer 5 are They are brought into contact with each other and integrated by means such as caulking.

[Problems to be solved by the invention] A piezoelectric vibrator with a conventional structure has an insulating layer 4 formed on a part of the peripheral edge of the vibrating substrate 1 and a part extending from this part to the piezoelectric element 2, and a layer on the insulating layer 4. Since the structure is such that the conductive layer 5 is formed so as not to contact the vibrating substrate 1, manufacturing the piezoelectric vibrator is not easy in terms of process and workability. Layer 5 itself is also unreliable.

The present invention aims to improve these conventional drawbacks.

[Means for solving the problem] The present invention uses a metal vibrating board in which one pole face of a piezoelectric element is attached to the central part that protrudes from the periphery, and a lead conductor is attached to the other pole face. , a first one connected to the first and second terminals on one side, respectively;
A piezoelectric electroacoustic transducer comprising a terminal plate formed with a second conductive portion, wherein a ring-shaped insulator is interposed between the peripheral edge of the metal vibrating substrate and the lead conductor, and the ring-shaped A conductive layer having a U-shaped cross section is formed on the insulator, and the conductive layer is brought into contact with the periphery of the metal vibrating board, and the metal vibrating board and the terminal plate are overlapped, and the conductive layer and the first conductive layer are stacked together. The lead conductor and the second conductive part are connected to each other so as to be integrated.

[Function] According to the above means, the peripheral edge of the metal vibrating substrate that is electrically connected to one pole surface of the piezoelectric element is insulated from the first and second conductive parts of the terminal plate via the ring-shaped insulator, and One pole surface of the piezoelectric element is connected to the first and second conductive parts via a conductive layer, and the other pole surface of the piezoelectric element is connected to the first and second conductive parts via a lead conductor.

[Example] This will be explained with reference to FIG. 1, FIG. 2, and FIG. 3. In the drawings, parts equivalent to those of the conventional example shown in Figs. 4 to 6 are designated by the same reference numerals, and their explanations will be omitted.

FIG. 1 shows a bottom view of the piezoelectric vibrator used in the present invention. This piezoelectric vibrator is overlapped with the terminal plate 6 as shown in FIG. It is integrated by the caulking structure.

A lead conductor 10 is attached to the other electrode 3b of the piezoelectric element 2 attached to the metal vibration substrate 1 on the side opposite to the metal vibration substrate 1 using a conductive adhesive or a conductive adhesive. The lead conductor 10 may be a lead plate made of phosphor bronze or the like, or a lead foil.

A ring-shaped insulator 11 is interposed between the peripheral edge of the metal vibrating substrate 1 and the lead conductor 10, and a conductive layer 9 having a U-shaped cross section is disposed on the ring-shaped insulator 11 at a position substantially facing the lead conductor 10. form.
Examples of the conductive layer 9 include a metal conductor bent into a U-shape, a conductive tape, and a conductive adhesive.

This conductive layer 9 is brought into contact with the peripheral edge of the metal vibrating board 1, and the metal vibrating board 1 and the terminal plate 6 are overlapped, and the conductive layer 9 and the first conductive part 7a, the lead conductor 10 and the second The conductive portions 7b are brought into contact with each other and integrated by a caulking structure on the outer periphery of the case 12.

[Effects of the invention] According to the above structure, there is no need to perform any processing on the metal vibrating substrate 1, and the conductive layer 9 can be easily formed by pressing, pasting, or coating. Since the ring-shaped insulator 11 can be uniformly mass-produced by pressing, a conventional piezoelectric vibrator (an insulating layer is formed on a part of the peripheral edge of the vibrating substrate and a part from this part to the piezoelectric element, and the vibrating (The conductive layer is formed so that it does not come into contact with the substrate.) Mass production is better, the quality is more uniform and stable, and reliability is improved.

[Brief explanation of drawings]

Figure 1 is a bottom view showing the structure of the piezoelectric vibrator used in the piezoelectric electroacoustic transducer of the present invention, Figure 2 is a plan view showing the structure of the terminal plate, and Figure 3 is the piezoelectric vibrator of the present invention. 4, 5, and 6 are cross-sectional views showing the structure of an electroacoustic transducer. FIGS. 4, 5, and 6 are diagrams showing the structure of a conventional piezoelectric electroacoustic transducer. 1 is a metal vibration substrate, 2 is a piezoelectric element, 3a, 3b
are the same electrodes, 6 is a terminal plate, 7a and 7b are first and second conductive parts, 8a and 8b are first and second terminals, 9
10 is a conductive layer, 10 is a lead conductor, and 11 is a ring-shaped insulator.

Claims (1)

[Scope of utility model registration request] A metal vibrating substrate 1 has one pole surface 3a of a piezoelectric element 2 attached to the central part protruding from the peripheral edge, and a lead conductor 10 attached to the other pole surface 3b, and a first and a first conductor are attached to one surface. In the piezoelectric electroacoustic transducer, the piezoelectric electroacoustic transducer includes a terminal plate 6 formed with first and second conductive parts 7a and 7b connected to terminals 8a and 8b of the metal vibrating substrate 1, respectively. A ring-shaped insulator 11 is interposed between the lead conductor 10 and a conductive layer 9 having a U-shaped cross section. The metal vibrating substrate 1 and the terminal plate 6 are stacked together in contact with each other, and the conductive layer 9 and the first conductive part 7a, and the lead conductor 10 and the second conductive part 7b are connected in contact with each other to be integrated. A piezoelectric electroacoustic transducer characterized in that it is configured to