JP2598915Y2 - Magnet-type sounding body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a magnet type sound generator in which a connection between a lead leg and a terminal of a coil is hardly broken.

[0002]

2. Description of the Related Art FIG. 2 is a cross-sectional view showing a state in which a conventional magnet type sounding body is mounted on a printed circuit board, and FIG. 3 is a side view showing a state in which a terminal of a coil is connected to a lead leg. FIG. 4 is a cross-sectional view showing the vicinity of a lead leg when a conventional magnet-type sounding body is mounted on a printed circuit board.

As shown in FIG. 2, a magnet type sounding body 1 comprises an iron core 10, a bobbin 11, a coil 12, and a lead leg 13.
, A permanent magnet 14, a diaphragm 15 and a yoke 16. The iron core 10 is cylindrical and has a bobbin 1 at the upper end.
A flange portion for fixing 1 to yoke 16 is formed. The bobbin 11 has an upper flange and a lower flange formed on both peripheral edges of a cylindrical column, and a lead leg 13 is provided on the lower surface of the lower flange.
Are formed at two places. The coil 12 is formed by winding a thin polyurethane copper wire between the upper and lower flanges of the bobbin 11, and the thin polyurethane copper wire 12a at the end of the coil 12 is connected to each lead leg 13 by soldering. I have. The lead foot 13 shaped like a rod, which is solder-plated, is intended to be fixed into the mounting hole P ₁ provided on the printed board P of the various devices by soldering. The permanent magnet 14 has a cylindrical shape surrounding the bobbin 11. The vibration plate 15 is a disk-shaped member placed on the upper end of the permanent magnet 14. The yoke 16 is made of a pressed disk-shaped steel plate.
A core insertion hole for inserting the lower end of the bobbin 11 is provided, and lead holes 16a into which two protruding portions 11a of the bobbin 11 are fitted are provided near the center, respectively. 14 are mounted and attached.

The above-mentioned magnet type sounding body 1 constructed by assembling the iron core 10, the bobbin 11, the coil 12, the lead leg 13, the permanent magnet 14, the diaphragm 15 and the yoke 16 has a mounting hole P for various devices. _The lead leg 13 which is used by being mounted on a printed circuit board P provided with 1 and protruding from the lower surface of the yoke 16 of the magnet type sounding body 1 has a mounting hole P _1.
And soldered.

As shown in FIG. 3, the connection between the thin polyurethane copper wire 12a at the end of the coil 12 and the lead leg 13 is made as shown in FIG.
2a is pulled out from the bobbin 11, wound around the lead leg 13, and connected and fixed by soldering. Therefore, the terminal of the coil 12 pulled out from the bobbin 11 is connected to the lead leg 1.
For a short period of time until reaching No. 3, only the thin polyurethane copper wire 12a is laid over the space. Therefore, when the magnet type sounding body 1 is mounted on the printed circuit board P, as shown in FIG.
2a only becomes the state close to the corner portion P ₂ of the mounting hole P ₁ just printed board P is passed portion sieved space.
Accordingly, the magnet type sounding body 1 by inserting the lead leg 13 to the mounting hole P ₁ of the printed circuit board P for incorporation into various devices, being in contact with the lower surface of the yoke 16 to the printed circuit board P, Magnetic pronounce When the body 1 is displaced so as to slide on the surface of the printed circuit board P, a portion where only the polyurethane copper wire 12a extends over the space becomes a corner P
₂ may cause the wire to be broken.

Therefore, in the conventional magnet type sounding body 1, the polyurethane copper wire 12 a near the end of the coil 12 is twisted so that the polyurethane copper wire 12 a does not expand and break even when the corner P ₂ hits. Was given.

[0007]

However, there is a problem that the above-mentioned twisting process is troublesome, and the wire may be broken during the twisting process, so that the quality is not stable.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an inexpensive method that can easily prevent disconnection without performing a complicated twisting process near the terminal of a coil. It is to provide a magnet type sounding body.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention forms an upper flange and a lower flange around both ends of a cylindrical column into which an iron core is inserted. A bobbin in which a coil is wound and a projection on which a lead leg connecting the both ends of the coil is formed on the lower surface of the lower flange is formed, and a cylindrical plate surrounding the bobbin and having a diaphragm mounted on an upper end thereof. A permanent magnet, and a yoke in which the bobbin and the permanent magnet are placed and attached, and a projection of the bobbin is fitted to form a lead hole in which the lead leg projects from the lower surface, and is provided on the printed circuit board. A magnet leg for mounting on a printed circuit board, wherein a lead leg projecting from the lower surface of the yoke is inserted into a mounting hole so that the lower surface of the yoke contacts the printed circuit board, and the lead leg is soldered and mounted on the printed circuit board. In the body, the lower edge of the yoke Characterized in that a stepped portion for floating the yoke lower surface in the vicinity of the lead hole from the printed circuit board.

[0010]

According to the structure described above, the connection portion between the coil and the lead leg moves away from the printed circuit board.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the magnet type sounding body according to the present invention will be described in detail with reference to FIG. FIG. 1 is a cross-sectional view showing a state in which a magnet type sounding body 1 is mounted on a printed circuit board P, and portions that are the same as those in the related art are given the same symbols.

As shown in FIG. 1, a magnet type sounding body 1
Is characterized in that when the yoke 16 is pressed, a step is formed at the periphery of the yoke 16 by drawing. In addition, for convenience of forming the step 16 b on the yoke 16, a step 14 a for mounting and attaching to the yoke 16 is provided on the inner peripheral edge of the lower end of the permanent magnet. Also, the lead leg 13 has a height H of the step 16b.
Minutes have been long.

[0013] Thus, the magnet type sounding body 1 on a printed board P to mounting holes P ₁ of various devices is provided, the lead leg 13 projecting from the lower surface of the magnet type sounding body 1 of the yoke 16 to the mounting hole P ₁ When the device is inserted, soldered, and mounted, the lower surface of the yoke 16 near the lead hole 16a can be mounted in such a manner as to rise from the printed circuit board P by a dimension H.

Therefore, the bobbin 1 described in the prior art is used.
A thin polyurethane copper wire 12 which is a short time until the end of the coil 12 pulled out of the wire 1 reaches the lead leg 13.
part a only a state passed sieved space can be kept away from the corner P ₂ of the mounting hole P ₁ of the printed circuit board P. Therefore, the magnet type sounding body 1 is
Polyurethane copper wire 1
Portions 2a only is made as passed sieved space risk of breakage not abut the corner P ₂ are eliminated. Therefore,
This eliminates the need to perform a complicated twisting process on the polyurethane copper wire 12a near the end of the coil 12 as in the related art.

[0015]

[Effect of the Invention] Since the magnet type sounding body of the present invention is configured as described above, the connection between the terminal of the coil and the lead leg can be mounted away from the printed circuit board. Even if it occurs, there is an effect that an inexpensive magnet-type sounding body with stable quality can be provided without disconnection without performing a twisting process, which is troublesome and costly to the terminal of the coil as in the related art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which one embodiment of a magnet type sounding body according to the present invention is mounted on a printed circuit board.

FIG. 2 is a cross-sectional view showing a state where a conventional magnet-type sounding body is mounted on a printed circuit board.

FIG. 3 is a main part side view showing a state where a terminal of a coil of a conventional magnet type sounding body is connected to a lead leg.

FIG. 4 is a cross-sectional view showing the vicinity of a lead leg when a conventional magnet type sounding body is mounted on a printed circuit board.

[Explanation of symbols]

1 Magnetic sounding body 10 core 11 the bobbin 11a protrusion 12 coil 13 lead leg 14 permanent magnets 15 vibrating plate 16 yoke 16a lead hole 16b stepped portion P printed board P ₁ mounting hole

Claims (1)

(57) [Scope of request for utility model registration] An upper flange and a lower flange are formed on both peripheral edges of a cylindrical column into which an iron core is inserted, and a coil is wound between the upper and lower flanges. A bobbin formed with a protrusion on which a lead leg connecting both ends is formed, a cylindrical permanent magnet surrounding the bobbin and having a diaphragm mounted on an upper end, and mounting and attaching the bobbin and the permanent magnet And a yoke formed with a lead hole in which the protrusion of the bobbin fits and in which the lead leg projects from the lower surface. The lead leg projecting from the lower surface of the yoke into a mounting hole provided in a printed circuit board. A magnet type sound generator for mounting on a printed circuit board, wherein the lower surface is inserted into contact with the printed circuit board and the lead legs are soldered to the printed circuit board. Is the bottom surface of the printed circuit board A magnet-type sounding body characterized in that a step is provided to float the object.