JPH0141277Y2 - - 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. 5, 6, and 7.

Figure 5 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. 6 shows a plan view of the terminal board, in which two halves of arc-shaped first and second conductive patterns 7a and 7b are printed 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 a caulking structure on the outer periphery of the metal case 12.

[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 a vibrating substrate 1 and a part extending from this part to the piezoelectric element 2, and a layer on this insulating layer 4. Since the structure is such that the conductive layer 5 is formed so as not to come into contact with the vibrating substrate 1, manufacturing the piezoelectric vibrator is not easy in terms of process and workability. Layer 5 itself is also unreliable.

Further, an insulating layer 4 is provided on a portion of the peripheral edge of the vibration substrate 1.
Further, a conductive layer 5 is formed on this insulating layer 4.
A portion of the peripheral edge of the vibrating substrate 1 is thicker than other portions, and the thickness of the peripheral edge is not uniform, resulting in an unreasonable caulking structure.

Furthermore, since the metal case 12 is electrically connected to the piezoelectric element 2 through the vibrating substrate 1 at its outer periphery, the charged piezoelectric element 2
Electric discharge occurs between the battery and the human body, creating a problem.

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;
In the piezoelectric electroacoustic transducer comprising a terminal plate forming a second conductive portion, a portion of the peripheral edge of the metal vibrating substrate facing the tip of the lead conductor has a larger diameter than the tip of the lead conductor. forming a notch having a width in a circumferential direction and having a width in a radial direction larger than a width in a radial direction of a circumferential edge of the metal vibrating substrate; The metal vibrating board and the terminal plate are overlapped so that the lead conductor and the second conductive part are in contact with each other, and a ring-shaped insulator is placed between the periphery of the metal vibrating board and the outer periphery of the metal case. The metal case, the piezoelectric vibrator, and the terminal plate are integrated by a caulking structure on the outer periphery of the metal case.

[Operation] According to the above means, one pole surface of the piezoelectric element is connected to the first and second conductive parts through the peripheral edge of the metal vibrating substrate, and the other pole surface of the piezoelectric element is connected to the first and second conductive parts through the lead conductor. Each is connected by contact.

In addition, a lead conductor is placed in the notch on the periphery of the metal vibrating board, and electricity is supplied to the piezoelectric element through this lead conductor, so the thickness of the periphery of the metal vibrating board is uniform over the entire circumference. become.

Further, the piezoelectric vibrator and the metal case are insulated by the ring-shaped insulator.

[Example] This will be explained with reference to FIGS. 1, 2, 3, and 4. In the drawings, parts equivalent to those of the conventional example shown in Figs. 5 to 7 are designated by the same reference numerals, and their explanations will be omitted.

FIG. 1 shows a bottom view of a piezoelectric vibrator used in the present invention. This piezoelectric vibrator is stacked with a terminal plate 6 as shown in FIG.
They are integrated by the caulking structure of the outer periphery (Fig. 3).

A lead conductor 10 is attached to the other electrode 3b of the piezoelectric element 2 on the opposite side from the metal vibrating substrate 1 using a conductive adhesive or a conductive adhesive. A portion of the peripheral edge of the metal vibrating substrate 1 that is opposed to the tip of the lead conductor 10 has a width in the circumferential direction larger than the tip of the lead conductor 10, and the metal vibrating substrate 1
A notch 9 having a radial width larger than the radial width of the peripheral edge of the metal vibrating substrate 1 is formed to prevent the lead conductor 10 from coming into contact with the peripheral edge of the metal vibrating substrate 1, as shown in FIG. The lead conductor 10 may be a lead plate made of phosphor bronze or the like, or a lead foil.

The peripheral portion of the metal vibrating substrate 1 and the first conductive portion 7a,
The metal vibrating board 1 and the terminal plate 6 are arranged so that the lead conductor 10 and the second conductive part 7b are in contact with each other.
At the same time, a ring-shaped insulator 11 is interposed between the periphery of the metal vibrating substrate 1 and the outer periphery of the metal case 12, and the caulking structure of the outer periphery of the metal case 12 allows the metal case 12 and piezoelectric vibration to be The terminal board 6 and the terminal board 6 are integrated.

[Effect of the invention] According to the above structure, the metal vibrating substrate 1 with the notch 9 formed therein and the ring-shaped insulator 11 can be uniformly mass-produced by press working, so that an insulating layer and a conductive layer can be formed on the vibrating substrate. Compared to conventional piezoelectric vibrators formed with two layers, mass production is better, and the quality is more uniform and stable.

In addition, by arranging the lead conductor 10 in the notch 9 at the peripheral edge of the metal vibrating board 1, the thickness of the peripheral edge of the metal vibrating board 1 becomes uniform over the entire circumference, so that integration by the caulking structure is possible. Become more solid and certain.

Furthermore, since the metal case 12 is insulated from the piezoelectric vibrator, it will not be charged and no discharge will occur between the piezoelectric element 2 and the human body, especially in dry regions.

[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. FIG. 4 is a cross-sectional view showing the structure of the electroacoustic transducer; FIG. FIG. 3 is a diagram showing the structure of a 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 notch, 10 is a lead conductor, 11 is a ring-shaped insulator, and 12 is a metal case.

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 is provided with 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. The portion where the tip of the lead conductor 10 faces has a circumferential width larger than the tip of the lead conductor 10 and a radial width larger than the radial width of the peripheral edge of the metal vibrating substrate 1. A notch 9 is formed in the metal vibrating board 1 and the terminal plate so that the peripheral edge of the metal vibrating board 1 and the first conductive part 7a and the lead conductor 10 and the second conductive part 7b are in contact with each other. 6 are overlapped, and a ring-shaped insulator 11 is interposed between the peripheral edge of the metal vibrating board 1 and the outer peripheral part of the metal case 12, and the metal case 1
Metal case 12 due to the caulking structure on the outer periphery of 2.
A piezoelectric electroacoustic transducer characterized in that a piezoelectric vibrator and a terminal plate 6 are integrated.