JPH0619280Y2 - Piezoelectric transducer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a piezoelectric acoustic transducer including a piezoelectric speaker, a piezoelectric buzzer, and the like, which are mounted by vertically fixing the plate surface of a mounting substrate.

2. Description of the Related Art Conventionally, this type of piezoelectric acoustic transducer is provided with + and − pole terminal pieces connected to a unimorph oscillator fitted and fixed to the inside of an outer case via lead wires in the outer case. The outer end of each terminal piece that protrudes outward from the outer case is inserted into a mounting hole provided on the plate surface of the mounting board for temporary fixing, and the outer end that protrudes from the mounting hole of the mounting board to the back surface. It is usually mounted on the plate surface of the mounting substrate by soldering the protruding end portion on the side.

However, in this piezoelectric acoustic transducer, since the left and right terminal pieces only support two points on the plate surface of the mounting substrate, the whole body including the outer case easily falls sideways due to bending of the terminal piece, etc. When the piece is inserted into the mounting substrate, there is a possibility that the piece may be tilted or may come off while being fed into the soldering process.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide a piezoelectric acoustic transducer that can be stably fixed upright on a plate surface of a mounting substrate and reliably prevented from being detached.

Means for Solving the Problems In a piezoelectric acoustic transducer according to the present invention, an outer case integrally formed from a resonance cylinder part on an upper side to which a piezoelectric vibrator is fitted and fixed and a flat flange part on a lower side is formed. The outer case has an inner end side connected and fixed to a predetermined portion of the piezoelectric vibrator, and a bulging rib is provided along the longitudinal direction so that the outer end side protrudes outward from the flat flange portion and left and right. Attach the terminal pieces of the above, and further, hook-shaped projection pieces that are respectively projected from the bottom surface of the flat flange portion and are located approximately in the middle of the terminal pieces, and left and right legs that are located near the corners of the flat flange portion. Integrally molded, the left and right terminal pieces are brought into close contact with the bulging ribs in the holes and fit and fixed in the mounting holes of the mounting board, and the projecting end side of the protruding piece is inserted and locked from the mounting hole of the mounting board to the back side. Clamp the mounting board from the left and right legs. It is configured as an upright fixed type.

Function In this piezoelectric acoustic transducer, the left and right terminal pieces are closely fitted into the holes by the bulging ribs and are fitted and fixed in the mounting holes of the mounting board, and the protruding pieces are inserted on the back side of the mounting holes of the mounting board. Since the outer case is erected and fixed by sandwiching the mounting board with the left and right legs, it is formed in the shape of a hook to stop, so that the outer case does not fall off sideways or tilt, and further does not come off. It can be fixed upright stably and securely.

Embodiments The following will be described with reference to the accompanying drawings.

In this piezoelectric acoustic transducer, as shown in FIG. 1, a unimorph oscillator piezoelectric vibrator 2 is fitted and fixed inside an outer case 1,
The electrodes 21 of the piezoelectric vibrator 2 and the plate surface of the vibration plate 22 are configured by connecting the positive and negative pole terminal pieces 5 and 6 on the inner end side through the lead wire portions 3 and 4.

The outer case 1 is made of a resin molded product, and a cylindrical resonance cylinder portion 11 for fitting and fixing the piezoelectric vibrator 2 is formed on the upper side. As shown in FIGS. 2 and 3, a sound emission hole 12 is concentrically provided on the front surface side of the resonance cylinder portion 11, and the left and right side surfaces have a semi-arcuate shape used for being held by an automatic insertion machine. Recesses 13 and 14 are provided. The lower side of the recesses 13 and 14 is resin-molded integrally with the resonance cylinder portion 11 as a flat flange portion 15 having left and right corners.

Left and right terminal pieces 5 and 6 are attached and fixed to the plate thickness surface of the flat flange portion 15 by pivotally supporting the outer case 1 with pins 16 and 17. The terminal pieces 5 and 6 are mounted so that the outer ends thereof project outward from the flat flange portion 15. As the terminal pieces 5 and 6, the lead wire portions 3 and 4 that are continuous and integrally molded can be used. The terminal pieces 5 and 6 have bulging ribs 5a and 6a formed by projecting and molding the plate surface on the outer end side along the longitudinal direction.
Is provided.

Further, the hook-shaped projection piece 18 is integrally resin-molded so as to be located approximately in the middle of each of the terminal pieces 5 and 6 so as to project from the bottom surface of the flat flange portion 15. As shown in FIG. 4, the projecting piece 18 may be formed by shifting the left and right terminal pieces 5 and 6 parallel to each other in the front or rear. In addition to the projecting piece 18, leg portions 19a and 19b are integrally resin-molded on the flat flange portion 15 so as to protrude from the bottom surfaces near the left and right corners. The leg portions 19a and 19b are preferably formed in a bar shape having a length over the entire width of the side surface of the outer case 1 as shown in FIG.

In the piezoelectric acoustic transducer thus configured, the chuck of the automatic insertion machine can be engaged with the recesses 13 and 14 of the external case 1 to hold the external case 1 by the automatic insertion machine. Depending on the automatic insertion machine, as shown in FIG.
By inserting 6 and the projecting piece 18 into the mounting holes provided in the plate surface of the printed circuit board P, the whole including the outer case 1 can be erected and fixed upright on the plate surface of the printed circuit board P. . In this erected state, the terminal pieces 5 and 6 are brought into close contact with the inside of the holes by the bulging ribs 5a and 6b, and the printed circuit board P is
It is fitted and fixed in the mounting hole of. Further, since the projection piece 18 is engaged with the rear surface side from the mounting hole of the printed circuit board P on the projecting end side, the leg portion 1 abutted on the plate surface of the printed circuit board P.
By holding the printed circuit board P with 9a and 19b, the printed circuit board P can be erected and fixed.

Therefore, this piezoelectric acoustic transducer has three-point support by the terminal pieces 5, 6 and the projecting piece 18, as well as the projecting piece 18 and the leg portion 19.
By sandwiching the printed circuit board P with a and 19b, the printed circuit board P can be stably erected and fixed on the plate surface of the printed circuit board P. Further, if the protruding piece 18 is provided so as to be displaced from the left and right terminal pieces 5 and 6 which are parallel to each other in the front or rear, it is possible to more stably and vertically fix it to the plate surface of the mounting substrate P.

When it is temporarily fixed and sent to the subsequent soldering process, the whole terminal including the outer case 1 does not tilt or come off, and the terminal piece protruding to the back surface side of the printed circuit board P is kept upright. It is possible to reliably solder and fix the tip ends of 5 and 6.

Effect of the Invention As described above, according to the piezoelectric acoustic transducer of the present invention, the whole body including the outer case can be securely fixed in the upright state by the three-point support with the left and right terminal pieces and the projection piece. Since the mounting board is held between the piece and the leg portion, it is possible to sufficiently counteract the external force applied in the bending direction of the terminal piece, and it is possible to firmly and vertically fix the terminal piece so as to prevent it from falling sideways, tilting, or coming off.

[Brief description of drawings]

FIG. 1 is a rear view of a piezoelectric acoustic transducer according to the present invention, FIG. 2 is a front view of the transducer, FIG. 3 is a sectional view of the transducer taken along the line AA in FIG. 2, and FIG. FIG. 5 is a sectional view of the converter taken along the line BB in FIG. 2, and FIG. 5 is a side view showing the converter in a standing and fixed state with respect to a mounting substrate. 1: Exterior case, 2: Piezoelectric vibrator, 5, 6: Terminal piece, 5
a, 6a: bulging rib, 11: resonance cylinder part, 15: plane flange part, 18: protrusion piece, 19a, 19b: leg part, P: mounting substrate.

Claims (2)

[Scope of utility model registration request] 1. An outer case integrally formed from a resonance cylinder part on an upper side into which a piezoelectric vibrator is fitted and fixed and a flat flange part on a lower side, the inner end side of which is a piezoelectric vibrator. The fixed end is connected and fixed to the predetermined part of the plate, and the bulging ribs are provided along the longitudinal direction of the plate surface, and the left and right terminal pieces are attached by projecting the outer end side outward from the flat flange portion. Of the hook-shaped protrusions that are located approximately in the middle of the terminal pieces by projecting from the bottom of each section, and the left and right legs that are located near the corners of the flat flange, are integrally molded, and the left and right terminal pieces are formed into holes. The bulging ribs closely contact the inside of the mounting board to fit and fix it in the mounting hole of the mounting board. A pressure characterized by being configured as an upright fixed type by sandwiching Acoustic transducer. 2. The piezoelectric acoustic device according to claim 1, wherein the projecting piece is formed integrally with the outer case by shifting the position of the projecting piece before or after each of the left and right parallel terminal pieces. converter.