JPS5832397B2 - electronic buzzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a drive coil 1, an iron core 2 excited by the drive coil 1, a part of which is fixed to one end of a magnet 3, and the other part of which is attached to an end surface of the iron core 2. In this electronic buzzer, a coil frame 8 has a through hole 5 for inserting an iron core 2 in the center and flanges 6, 7 at both upper and lower ends. A protrusion 10 with the base end of the piece 90 buried is integrally formed, a notch 11 reaching the protrusion 10 is formed in the flange 6, and the lead wires 1a, lb, lc of the drive coil 1 are wound around the coil frame 8. is led out along the notch 11 and connected to the terminal piece 9, and the protrusion 10 is connected to the yoke plate 1.
As a specific invention, there is provided an electronic buzzer characterized in that the electronic buzzer is fitted into the mounting hole 13 of the board as shown in FIG.
A protruding part in which the base end of the terminal piece 9 is embedded is integrally formed in one flange part 6 of the coil frame 8 having the coil frame 7.
A notch 11 reaching 0 is formed in the flange 6, and the coil frame 8 is
The lead wires 1a, 1b, 1c of the drive coil 1 wound around
is led out along the notch 11 and connected to the terminal piece 9, and the protrusion 1 of the coil frame 8 is inserted into the mounting hole 13 provided in the yoke plate 12.
A cylindrical magnet is formed by inserting the magnet 0 and fixing the lower end of the iron core 2 extending through the through hole 5 of the coil frame 8 into the locking hole 16, and joining the lower end to the peripheral edge of the yoke plate 12. 3
A second invention provides an electronic buzzer characterized in that a peripheral portion of a diaphragm 40 is joined to an upper end portion, and the center of the diaphragm 4 is placed opposite to the upper end surface of an iron core 2 through a gap. The purpose of this invention is to provide an electronic buzzer with high productivity and high reliability.

Conventionally, as shown in FIGS. 13 and 14, the pre-formed drive coil 1 was directly bonded to the yoke plate 12, which could cause a short circuit between the yoke plate 12 and the drive coil 1. Lead wires 1a, 1 of drive coil 1
Since the wires 1a and 1c were drawn out through the notch hole 17 of the yoke plate 12, the lead-out lines 1a and 1c at this drawing portion
b. It has a problem that there is a large risk of breaking the lc,
From a process standpoint, since the drive coil 1 is produced, stored, and transported as a single coil, there is a problem in that there are many defects such as fraying and disconnection of the coil.

The present invention has been provided in view of the above points, and one embodiment of the present invention will be described in detail below with reference to the drawings.

Reference numeral 8 denotes a synthetic resin coil frame around which the drive coil 1 is wound, and a through hole 5 for inserting the iron core 2 that penetrates vertically in the center.
are formed, and flanges 6.7 are integrally formed at both upper and lower ends.

A substantially cylindrical protrusion 10 that protrudes downward is formed integrally with the lower flange 6, and a terminal piece 90 is attached to this protrusion 10.
The proximal end is embedded and molded, and a notch 1 is formed on the side surface of the flange 6 and the protrusion 10 from the inside of the flange 6 to the protruding base end of the terminal piece 9.
1 is formed.

A lead line la drawn out from the midpoint and both ends of the drive coil 1.

lb and lc pass through the notches 11 and are wound and connected to the corresponding terminal pieces 9.

The coil block formed as described above is attached to the yoke plate 1.
2, a mounting hole 13 and a locking hole 16 are formed in the yoke plate 12, and the protrusion 10 of the coil frame 8 is fixed to the upper surface of the coil frame 8.
are inserted into the corresponding mounting holes 13 so that the terminal pieces 9 protrude downward from the lower surface of the yoke plate 12, and then the iron core 2, which has a head 2a at its upper end, is passed through the through hole 5 of the coil frame 8 and this iron core is inserted into the corresponding mounting hole 13. The two lower ends are compared and tightened and fixed in the hole 16.

After the coil flock is fixed on the yoke plate 12 as described above, the lower end of the circumferential magnet 3 is fixed on the upper surface of the periphery of the yoke plate 120, and the periphery is fixed to the upper end notch 18 of the magnet 3. The central lower surface of the diaphragm 4 to which the magnetic plate 19 is fixed is placed opposite to the upper surface of the head 2a of the iron core 2 with a gap therebetween.

After that, for example, the yoke plate 12 is mounted on the printed board 14, and the terminal pieces 9 protruding from the lower surface of the yoke plate 12 are soldered and adhered to the lower surface of the printed board 14, and then the sound output holes 20
The case 21 with the yoke plate 12 is press-fitted onto the yoke plate 12, and the case 21 is attached to the printed board 14 with the screws 2.
It is fixed with 2 stops.

The drive coil 1 is driven by, for example, a Floraking oscillation circuit as shown in FIG. 5 to generate a buzzer sound.

FIG. 6 shows another embodiment of the present invention, in which press-fit pieces 23.23 are provided upwardly projecting from important points on the periphery of the yoke plate 120, and are inserted into press-fit recesses 24.24 provided on the inner peripheral surface of the case 21. The case 21 is attached to the outer periphery of the sounding body block consisting of the yoke plate 12 and the magnet 3 by press-fitting the press-fitting pieces 23 and 23.
For this reason, the sounding body block is strongly hooked to the case 21 (this ensures that the sounding body block is press-fitted into the case 21), and therefore the upper end of the magnet 3 is pressed by the inner surface of the case 21. By doing so, it is possible to eliminate the need for fixation between the yoke plate 12 and the magnet 3.

In the embodiment shown in FIG. 6, the lower surface of the head 2a of the iron core 2 is an inclined surface, so that when the iron core 2 is tightened and fixed to the yoke plate 12, the coil frame 8 is sufficiently tightened. The upper end edge of the through hole 5 passing through the coil frame 18 is pushed out laterally by the inclined surface of the lower surface of the head 2a.
Shaking can be prevented.

In this case, Figure 8a. b to FIG. 9, if a protruding rib 25 in an inclined direction is provided on the inclined surface of the lower surface of the head 2a, the protruding rib 25 bites into the upper end periphery of the through hole 5, so that the iron core Rotation of the coil frame 8 relative to the coil frame 2 is prevented.

FIG. 10 shows still another embodiment of the present invention, in which a recessed step 26 is formed on the outer periphery of the lower part of the magnet 3, and the outer peripheral surface of the yoke plate 12 is made to match the circumferential surface of the recessed step 26. Part 2
The joint surface between the magnet 3 and the yoke plate 12 is sealed by heat-shrinking a heat-shrinkable tube 2γ disposed across the circumferential surface of the magnet 3 and the outer circumferential surface of the yoke plate 12. The fixing is carried out in the same manner as in the previous embodiment.

FIGS. 11 and 12 show still another embodiment of the present invention, in which a thermal bonding boss 15 is further integrally provided downwardly protruding from the flange 6 of the coil frame 8 on the side from which the protrusion 10 is protruded. .

However, in this embodiment, the heat bonding boss 15 is passed through the through hole 28 of the yoke plate 12 and the through hole 29 of the printed board 14, and the terminal piece 9 of the sounding body block disposed on the upper surface of the printed board 14 is connected to the printed board. The sounding body block is fixed to the printed board 14 by soldering 30 on the lower surface of the printed board 14 and heat-bonding the heat-bonding boss 15 on the lower surface of the printed board 14.

As described above, the present invention includes integrally forming a protrusion in which the base end of a terminal piece is embedded in one of the flanges of a coil frame that has a through hole for inserting an iron core in the center and flanges at both upper and lower ends. A cutout that reaches this protrusion is formed in the flange, and the lead wire of the drive coil wound around the coil frame is led out along the cutout and connected to the terminal piece, and the protrusion is attached to a substrate such as a yoke plate. Since it is designed to fit into the mounting hole, there is no chance of the drive coil shorting out with the yoke plate or other parts, and there is no chance of the drive coil fraying or breaking during the process. (In addition, unlike the conventional example, there is no need to form a coil block as a single unit, so there is no need to form the drive coil with fused wire, and the number of processing steps for the lead wire of the drive coil is greatly reduced, and the lead wire This has the effect of reliably preventing wire breakage accidents and greatly improving productivity.

Furthermore, in the second invention, the protruding part of the coil frame is fitted into the mounting hole provided in the yoke plate, and the lower end of the iron core penetrated through the through hole of the coil frame is tightened and fixed in the shark hole. Therefore, the coil block consisting of the coil frame around which the drive coil is wound is securely fixed to the yoke plate, and there is no possibility of breakage of the lead wire due to rattling of the coil flock against the yoke plate. , the periphery of a diaphragm is joined to the upper end of a cylindrical magnet whose lower end is joined to the periphery of the yoke plate, and the center of this diaphragm is opposed to the upper end surface of the iron core through a gap. Therefore, the electronic buzzer can be assembled in a simple process.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the lower surface of the coil frame with parts omitted, FIG. 3 is an enlarged cross-sectional view of the same sounding body block, and FIG. FIG. 5 is a circuit diagram of the drive circuit for the drive coil of the above, FIG. 6 is a sectional view of another embodiment of the present invention, and FIG. FIG. 7 is an enlarged perspective view of essential parts of the inner surface of the case, FIG. 8 a and b are enlarged front and bottom views of the iron core, and FIG. FIG. 10 is a cross-sectional view of still another embodiment of the present invention, FIG. 11 is a cross-sectional view of a coil frame of still another embodiment of the present invention, and FIG. 12 is a cross-sectional view of the same sounding body block. , FIG. 13 is an enlarged sectional view of a conventional sounding body block, and FIG. 14 is an enlarged bottom view of the same as above, in which 1 is a drive coil, 1a, Ib, and lc are lead wires, 2 is an iron core, and 3 is an enlarged bottom view of the same. Magnet, 4 is a diaphragm, 5 is a through hole, 6.
7 is a flange, 8 is a coil frame, 9 is a terminal piece, 10 is a protrusion, 11 is a notch, 12 is a yoke plate, 13 is a mounting hole, 14
15 is a printed circuit board, 15 is a heat bonding boss, and 16 is a shark hole.

Claims (1)

[Claims] 1. Comprising a drive coil, an iron core excited by the drive coil, and a diaphragm with a part fixed to one end of the magnet and the other part opposed to the end face of the iron core. In an electronic buzzer, a protrusion in which the base end of a terminal piece is embedded is integrally formed in one of the flanges of a coil frame that has a through hole for inserting the iron core in the center and flanges at the upper and lower ends. forming a reaching notch in the flange, leading out the lead wire of the drive coil wound around the coil frame along the notch and connecting it to the terminal piece;
Electronic buzzer 2 characterized in that the protruding part is fitted into a mounting hole of a board such as a yoke plate. The electronic buzzer according to claim 1, characterized in that the electronic buzzer has a protruding heat bonding boss. 3. A coil frame having a through hole for inserting the iron core in the center and flanges at the upper and lower ends is integrally formed with a protrusion in which the base end of the terminal piece is buried in one of the flanges, and a notch that reaches this protrusion. The drive coil formed in the flange and wound around the coil frame is led out along the notch and connected to the terminal piece, and the protruding part of the coil frame is fitted into the mounting hole attached to the yoke plate. The lower end of the iron core penetrated through the through hole of the coil frame is fixed in the shark hole, and the peripheral edge of the diaphragm is joined to the upper end of the cylindrical magnet whose lower end is joined to the peripheral edge of the yoke plate. An electronic buzzer characterized in that the center of the diaphragm is placed opposite to the upper end surface of an iron core through a gap.