JPS6128479Y2 - - Google Patents

Description

[Detailed explanation of the invention] A piezoelectric bimorph in which a pair of piezoelectric element plates are attached to a central electrode plate made of metal foil is widely known as a speaker bimorph. A small tongue-shaped protrusion provided on the outer circumferential surface of the center electrode plate and a pair of piezoelectric element plates attached to the front and back surfaces of the electrode plate are sandwiched between each electrode surface and the electrode surfaces protruding from the outside. A pair of lead wires are connected to both bases of an elastic connecting piece by a troublesome process such as soldering, and one lead wire in particular has a very high resistance in μ units. Since it is necessary to directly apply solder to the thin center electrode electrode plate, a high level of skill is required, and the center electrode and outer electrode made of thin metal foil are difficult to handle, making them difficult to mass-produce. Ta.

The present invention is intended to provide a piezoelectric bimorph electrode section that is easy to mass-produce and can be easily attached to a speaker frame.Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a piezoelectric buzzer using the electrode part of the present invention, in which 1a and 1b are a pair of piezoelectric element plates, and 2 is a pair of piezoelectric element plates 1a and 1b which are connected to an electrode plate 21 by a conventional method. A center electrode is attached to the front and back surfaces and has a tongue-like small protrusion 22 from the outer periphery, and 3 is connected to the small protrusion 22 of the center electrode by soldering, soldering, etc. from the connecting part 31 outward. and a terminal leg 32 at the other end.
4 is the pair of piezoelectric element plates 1 described above;
Connect 41 to the electrode surfaces of a and 1b on the side opposite to the side pasted to the electrode plate 21 by soldering or the like.
a', 41b', extending outward from a connecting part 41 formed by a pair of elongated points 41a, 41b bent in the upside-down direction to face the center terminal 3, and having a terminal leg at the other end. 42, a plurality of sets of the center terminal 3 and the outer electrode 4 are integrally formed by a pair of bases as the electrode portion of the present invention, as shown in FIG.

That is, FIG. 2 shows a piezoelectric bimorph electrode of the present invention, in which a pair of piezoelectric element plates 1a and 1b (not shown) are attached to the front and back surfaces of the center electrode of FIG. a central terminal 3 extending outwardly from a connecting portion 31 to be connected to 22;
A pair of elongated contacts 41 to be connected by vertically sandwiching the electrode surfaces exposed to the outside on the side opposite to the pasted side of the pair of piezoelectric element plates also pasted on the electrode plate.
A, 41b are formed by slits S, and a plurality of sets of outer electrodes 4 extend outward from the connecting portion 41,
the first via their distal terminal legs 32 and 42.
The second trunk 1 will be extended from the main trunk 11a.
1b, connect both the connecting parts 31 and 41 of the center terminal 3 and the outer electrode 4, and connect the terminal legs 32, 42 at the other end.
A connecting portion 12 extending in the opposite direction is provided, and a plurality of sets of center terminals 3,
The outer electrode 4 and the connecting portion 12 between the connecting portions 31 and 41 are formed by punching metal foil or the like so as to be integrally provided.

In this example, as a preferred embodiment, the connecting portion 12 between the connecting portions 31 and 41 of the center terminal and the outer electrode is extended in the direction of the terminal legs 32 and 42 of both terminals to form an annular shape. However, this reinforcement is not particularly necessary, and the narrow cut portion C ₁ formed between the first base 11a and the connecting portion 12 of the center terminal 3 and the outer electrode 4, respectively.
˜C ₂ ″ and C ₁₁ ˜C ₁₂ ″ can be omitted.

Further, the electrode plate 21 and a pair of piezoelectric element plates 1
A central hole h consisting of a concentric small hole 21' drilled in the center of a and 1b and 1a' and 1b' facilitates positioning when laminating and pasting these three, and When the body is attached to the center of the bottom surface of a cone-shaped vibrating piece (not shown), it is possible to use rivets instead of conventional adhesives, but this can be omitted.

Since the electrode section of the piezoelectric bimorph of the present invention is constructed as described above, connection work that requires a high degree of skill such as soldering to the electrode plate of the center electrode made of thin metal foil is omitted, and the center terminal and the outer electrode A small hole 32a provided directly with the terminal leg of
and 42a, it can be attached to a frame (not shown) with rivets, so the speaker assembly work can be automated.

Moreover, since multiple sets of center terminals and outer electrodes are formed integrally with a pair of cores, there is a great advantage in handling and management. The exposed electrode surfaces on the side opposite to the pasted side of the piezoelectric element plates 1a and 1b are sandwiched from above and below by a pair of elongated contacts 41a and 41b, which serve as connection parts of the outer electrodes, and joined by soldering or the like. 41a', 41b', and then the connecting portion 31 of the center terminal 3 is joined to the small protruding edge 22 protruding from the outer periphery of the electrode plate 21 by soldering 22' or the like, and then the first main body 11a, A connecting portion 1 connecting the connecting portions 41 and 31 of the outer electrode and the center terminal
The piezoelectric bimorph shown in Fig. 1 can be easily manufactured by cutting off 2, and this manufacturing process is based on
Since it can be performed sequentially or simultaneously using a plurality of sets of center terminals 3 and outer electrodes 4 arranged in parallel between 1a and 11b, the mass production effect can be further enhanced.

[Brief explanation of the drawing]

FIG. 1A is a plan view of a piezoelectric bimorph manufactured using the electrode part of the present invention, and FIG.
FIG. 2 is a cross-sectional view taken along line A, leaving a part uncut, and FIG. 2 is a plan view showing the electrode portion of the piezoelectric bimorph of the present invention. 1a, 1b...Pair of piezoelectric element plates, 2...Center electrode, 11a...First backbone, 11b...Second backbone, 12...Joining portion, 21...Electrode plate, 22...
...Small rim, 3...Center terminal, 31...Connection part, 3
2...Terminal leg, 4...Outside electrode, 41...Connection part, 41a, 41b...Pair of contacts, 42...Terminal leg.

Claims (1)

[Scope of utility model registration request] A terminal leg at the end of the center terminal extends outward from a connection portion to be connected to a tongue-shaped small protrusion protruding from the outer periphery of the electrode plate of the center electrode having a pair of piezoelectric element plates attached to the front and back surfaces; Facing the center terminal outward from the connection part formed by a pair of elongated contacts that vertically sandwich and connect the electrode surface of the piezoelectric element plate on the opposite side to the side stuck to the electrode plate of the center electrode. A plurality of pairs of terminal legs of the outer electrodes extending from the first base body are provided, and the connection portions of the plurality of opposing center terminals and the outer electrodes are respectively connected and the terminal legs are connected to each other. An electrode portion of a piezoelectric bimorph, characterized in that a connecting portion formed on the opposite side extends from a second substrate corresponding to the first substrate.