JP2000298485A - Electromagnetic sounding body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the electromagnetic sounding body which makes it possible to build a coil spring in order from the top surface part as well as other element components in the case of assembling the coil spring, makes it easy to position the coil spring without using any jig, etc., and can improve the operability and decrease the man-hour. SOLUTION: The electromagnetic sounding body 10 stores element components such as an exciting coil 3, a magnet 4, a diaphragm 5, and a couple of coil springs (electrode spring terminal) 6 between a base cover 2 and a top cover 1, the coil spring 6 is equipped at their end parts with a coil spring terminal connection part 6a having a larger diameter than a coil part 6b and an electrode terminal 6c projecting from the reverse surface of the base cover 2, and a lead frame 7 molded to the base cover 2 and the coil spring terminal connection part 6a are fixed with solder 8. All components can be built in from the top side of the base cover 2, no complicated jig is used to position the spring, and the operability is improved to reduce the man-hour.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic sounding body which emits sound by vibrating a vibrating plate with an electromagnet. The present invention relates to an electromagnetic sounding body having:

[0002]

2. Description of the Related Art With the recent surface mounting of small electronic components, a surface mounting type in which an electromagnetic sounding body, which is a small buzzer, is directly mounted on a printed circuit board has become mainstream, and is often used for calling a pager such as a mobile phone or a pager. It is used.

[0003] As a conventional electromagnetic sounding body, Japanese Patent Application No. 10-129683 filed by the applicant of the present invention (filing date:
The technology is disclosed in "Electromagnetic sounding body". The outline will be described with reference to FIG.

FIG. 4A is a developed view showing a state in which the component parts of the electromagnetic sounding body are assembled on the case body, and FIG.
5A is a front view showing a state in which a coil spring (electrode spring terminal) in which the portion A in FIG. 4A is enlarged is soldered to a base cover. In FIG. 4A, reference numeral 10 denotes an electromagnetic sounding body. The electromagnetic sounding body 10 includes sounding members such as an exciting coil 3, a magnet 4, and a vibration plate 5 in a case body formed by an upper surface cover 1 and a base cover 2, and an electrode spring terminal extending outside from the base cover 2. A certain coil spring 6.

In FIG. 4B, a pair of lead frames 7 are insert-molded on the base cover 2. Further, the coil spring 6 is housed in the coil spring housing hole 2 a formed in the base cover 2 from the lower surface side of the base cover 2, and the electrode terminal is connected with the coil spring terminal connecting portion 6 a soldered to the lead frame 7 with the solder 8. The portion 6c protrudes from the lower surface of the base cover 2.

FIG. 5 to FIG. 8 are explanatory views of mounting a coil spring. FIG. 5 is a plan view of the front side of the spring soldering jig,
FIG. 6 is a plan view of the back surface side of FIG. 5, and FIG.
FIG. 7B is a sectional view taken along the line A, and FIG.
8A is an enlarged view of a portion B, FIG. 8A is a plan view of the back side of the jig as in FIG. 6, and FIG. 8B is a cross-sectional view of a spring fixing plate. First, referring to FIG.
, A predetermined number (five in FIG. 5) of base covers 2 are set. As shown in FIG. 6, the jig 11 is turned over, and the coil spring terminal connection portion 6a at the tip of the coil spring 6 is inserted into the spring insertion holes 11a (ten in FIG. 6) into which the tip of the coil spring 6 is inserted. Next, the spring fixing plate 12
After the jig 11 is turned upside down after pressing the coil spring 6 inserted by the step (1), the coil spring terminal connecting portion 6a of the coil spring 6 is inserted into the lead frame spring insertion hole 7 as shown in FIG.
protruding from a. Thereafter, as shown in FIG. 4B, the coil spring terminal connecting portion 6a of the coil spring 6 is fixed to the lead frame 7 with solder 8.

[0007]

However, the above-mentioned electromagnetic sounding body has the following problems. In other words, when the coil spring is soldered to the base cover of the electromagnetic sounding body, it is difficult to attach the spring to the base cover even if a positioning jig is used because the coil spring itself is small. Later, the workability is poor, such as turning over the jig, and there is a problem that the man-hour is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object that it is possible to sequentially incorporate a coil spring from the upper surface like other element parts when assembling the coil spring. It is an object of the present invention to provide an electromagnetic sounding body in which the position of a coil spring can be easily determined without using a coil, the workability can be improved, and the number of steps can be reduced.

[0009]

In order to achieve the above-mentioned object, an electromagnetic sounding body according to the present invention is provided with a case body having a sound-emitting hole and a top cover and a base cover fixed thereto, and housed in the case body. A yoke, an iron core provided at the center of the yoke, a magnet arranged around the yoke, and a magnetic circuit formed by the magnet, the iron core, and the yoke inside the case body. In order to connect to the magnet, the vibration plate disposed on the base cover receiving surface, the excitation coil disposed around the iron core, and the terminal of the excitation coil are connected, and the connection with the outside is established. In the electromagnetic type sounding body having an external connection terminal for achieving, the external connection terminal includes a pair of coil spring-shaped electrode spring terminals, and the electrode spring terminal has a coil spring terminal connection portion having a diameter larger than a coil diameter at an end. ,base A coil-shaped electrode terminal having a spring property protruding from the lower surface of the bar, and a terminal of the excitation coil is connected to a coil spring terminal connection portion of the electrode spring terminal via a lead frame by a fixing means such as solder. It is assumed that.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnetic sounding body according to the present invention will be described below with reference to the drawings. 1 to 4 relate to an electromagnetic sounding body according to an embodiment of the present invention.
FIG. 1B is a development view showing a state in which the component parts of the electromagnetic sounding body are incorporated in the case body, and FIG. 1B is a front view showing a state in which a coil spring obtained by enlarging a portion C in FIG. FIG. FIG. 2A is a plan view of the coil spring as viewed from above, FIG. 2B is a front view of the coil spring, and FIG.
FIG. 4 is a front view showing another state in which a coil spring is soldered to a lead frame. In the drawing, the same members as those of the prior art are denoted by the same reference numerals.

In FIG. 1, reference numeral 10 denotes an electromagnetic sounding body. As described in the related art, the electromagnetic sounding body 10 includes sounding members such as an exciting coil 3, a magnet 4, and a diaphragm 5 in a case body formed by an upper surface cover 1 and a base cover 2, and a base cover. Coil spring 6 projecting outside from 2
It is composed of

As shown in FIG. 2, the shape of the coil spring 6 is
A helical coil spring terminal connecting portion 6a having a diameter larger than the diameter of the coil portion 6b is formed at the end. This shape is not limited to a spiral shape, and may be another shape as long as the diameter is larger than the coil diameter.

With the above configuration, as shown in FIG. 1, the coil spring 6 is mounted on the base cover 2 without using any special jig used in the prior art and without using any special components. Insert and assemble sequentially from the top side. The coil part 6b of the coil spring 6 is housed in the coil spring housing part 2a of the base cover 2, and the coil spring terminal connecting part 6a is larger in diameter than the coil part 6b.
Of the base cover 2 is soldered to the lead frame 7 insert-molded on the base cover 2 with solder 8. The electrode terminal portion 6c of the coil spring 6 projects from the lower surface of the base cover 2.

In FIG. 3, the coil spring 6 is soldered with solder 8 in a state where the coil spring terminal connecting portion 6a of the coil spring 6 is in contact with the upper surface of the lead frame 7 insert-molded in the base cover 2.

[0015]

As is apparent from the above description,
According to the present invention, the external connection terminal of the electromagnetic sounding body is formed of a pair of coil spring-shaped electrode spring terminals, and the coil spring terminal connection portion is configured to be larger in diameter than the coil diameter, so that the element parts of the electromagnetic sounding body can be formed. When assembling, it can be assembled from the top side of the base cover, so that it is not necessary to use complicated jigs for positioning springs, etc. it can. Therefore, it is possible to provide an electromagnetic sounding body that can improve assembling workability and reduce man-hours.

[Brief description of the drawings]

FIG. 1A is an exploded view showing a state of assembling element parts of an electromagnetic sounding body according to an embodiment of the present invention;
FIG. 1B is a front view showing a state in which a coil spring obtained by enlarging a portion C in FIG. 1A is soldered to a lead frame.

2 (a) is a plan view of the coil spring as viewed from above, and FIG. 2 (b) is a front view thereof.

FIG. 3 is a front view showing another state in which the coil spring of FIG. 2 is soldered to a lead frame.

FIG. 4 (a) is a development view showing a state of assembling element parts of a conventional electromagnetic sounding body, and FIG. 4 (b) is a view showing FIG. 4 (a).
It is a front view showing the state where the coil spring which expanded section A of Drawing 1 is soldered to a lead frame.

FIG. 5 is a plan view of the front side of the soldering jig.

FIG. 6 is a plan view of the back side of the soldering jig of FIG. 5;

7A is a sectional view taken along line AA of FIG. 6, FIG.
FIG. 8B is an enlarged sectional view of a portion B in FIG.

8A is a plan view of the back side of the soldering jig of FIG. 5, and FIG. 8B is a cross-sectional view of a spring fixing plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top cover 2 Base cover 2a Coil spring storage part 3 Excitation coil 4 Magnet 5 Diaphragm 6 Coil spring (electrode spring terminal) 6a Coil spring terminal connection part 6b Coil part 6c Electrode terminal 7 Lead frame 8 Solder 10 Electromagnetic sounding body

Claims (1)

[Claims] 1. A case body having a sound emission hole, which is fixedly attached to an upper surface cover and a base cover, a yoke housed in the case body, an iron core provided at a central portion of the yoke, and Vibration arranged on the base cover receiving surface facing the magnet so that a magnetic circuit is formed by the magnet arranged around, the magnet, the iron core and the yoke inside the case body. A plate, an excitation coil arranged around the iron core, and an electromagnetic type sounding body having an external connection terminal for connecting a terminal of the excitation coil and connecting to the outside, wherein the external connection terminal is A pair of coil spring-shaped electrode spring terminals, the electrode spring terminal having a coil spring terminal connection portion having a diameter larger than the coil diameter of the coil spring at an end, and a coil-shaped electrode having a spring property protruding from the lower surface of the base cover. An electromagnetic sounding body comprising: a terminal; and a terminal of the exciting coil connected to a coil spring terminal connecting portion of the electrode spring terminal via a lead frame by a fixing means such as solder.