JPS5855743Y2 - speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker characterized by a connection between a yoke forming a magnetic circuit and the bottom of a frame.

In conventional speakers, the frame and the yoke constituting the magnetic circuit are joined together by welding, gluing, tightening, or the like.

However, joining by welding not only requires preparatory work such as brushing on the joint surfaces, but also the electrodes used for this welding will be significantly worn out during continuous work, which may lead to quality defects such as poor welding. be.

Furthermore, joining by adhesive operation not only requires proper management of the adhesive but also requires drying time, which lowers the manufacturing yield.

Furthermore, in joining by tightening work, prior to the tightening process, there is a process of providing multiple protrusions on the yoke, a process of providing multiple through holes in the frame, and alignment of the protrusions and the through holes. Since it is necessary to carry out the above steps in advance, the number of man-hours increases, and productivity is low, especially due to the difficulty of the above-mentioned alignment step.

The present invention has been devised in view of the current situation, and provides a speaker in which the yoke and the frame are joined by a tightening process that improves the above-mentioned difficulties.

The speaker of the present invention is shown in FIG.

1 is a bottom yoke with a center pole 2 in the center; 3
is an annular magnet placed on the bottom yoke 1; 4 is an annular upper yoke placed on the annular magnet 3; 5 is a frame made of a magnetic material whose bottom is joined to the upper yoke 4; The central portion is bent perpendicularly to the inner peripheral portion of the joined annular upper yoke 4, and the bent piece 6 forms a magnetic gap with the center pole 2.

A coil bobbin 7 has a voice coil 8 wound around its lower end, and is inserted into the magnetic gap.

Reference numeral 9 denotes a damper provided spanning the intermediate portion of the coil bobbin 7 and the frame 5; 10 a diaphragm whose central portion is coupled to the upper end of the coil bobbin 7; the outer periphery of the vibration plate is connected to the opening of the frame 5 is connected to.

Reference numeral 11.11 denotes a joint portion for joining the upper yoke 4 and the frame 5.

FIG. 2 is a partially cutaway perspective view of the connecting portion 11 between the upper yoke 4 and the frame 5.

That is, the connection between the upper yoke 4 of the speaker and the bottom of the frame 5 as described above is performed using a plurality of connecting portions 11 formed by the steps shown in FIGS. 3 to 5 below.

First, the upper yoke 4 and the bottom of the frame 5 are centered, and while they are overlapped, a male mold 12 having a trapezoidal vertical section and a rectangular cross section as shown in FIG. 3 is inserted into the upper yoke 4. The bent portion a and the punched portion shown in FIG. A protrusion 15 is formed.

Thereafter, the male die 12 on the upper yoke 4 side is held as it is, and a flat die 14 as shown in FIG. 5 is pressurized from the frame 5 side to roll the top of the protrusion 15.

By rolling the top of the protrusion 15, the top of the upper yoke 4 exposed on the upper surface of the frame through the punched portion is extended to the upper surface of the frame, and the frame 5 and the upper yoke 4 are firmly connected.

The speaker of the present invention shown in FIG.
1.11.11 and the above-mentioned bent piece 6 are press-formed at the same time.

Further, as shown in FIG. 6, a frame 5 having a through hole and an upper yoke 4 are overlapped, and the upper yoke 4 is made to protrude from the through hole provided in the frame 5 to the opposite surface using a male mold, As a modification of the present invention, it is also possible to join the upper yoke 4 and the frame 5 using a joint 11 obtained by press-rolling this protrusion.

The above-described speaker includes a plurality of connecting parts 1 consisting of the protruding parts 15 between the upper yoke 4 and the bottom of the frame 5.
1.11.11, the upper yoke 4 and the frame 5 are joined together, and the joint part 11.11.11 is provided so as to straddle the frame 5 and the coil bobbin 7 due to its protruding height. This limits the swing width of the damper and prevents the coil bobbin from bottoming out against the bottom yoke 1 when the coil bobbin swings large.

The speaker of the present invention is made by stacking the bottom of the frame and the yoke that constitutes the magnetic circuit, and applying pressure using a male mold on the yoke side and a female mold on the frame side, resulting in multiple pairs of engaged yokes. A protruding part of the frame is formed, and the bottom part of the frame and the yoke are formed by further press-rolling the tops of the engaged protruding parts using the male die and a new flat die. Since the bottom of the frame and the yoke can be aligned by simply aligning the centers of each, the above-mentioned one-time pressurization process can create an accurate and strong frame. This enables stable bonding between the yoke and the yoke.

Therefore, in the manufacturing process of the speaker of the present invention, the trouble of aligning the protrusions and recesses, which was seen in the conventional tightening work, is eliminated, improving the manufacturing yield, and it is also extremely cost-effective. be advantageous to

In addition, in the speaker of the present invention, the above-mentioned connecting portion is provided to protrude from the frame and restricts the movement of the damper, so that the coil bobbin held by the damper swings wide and bottoms out at the bottom of the yoke. It is possible to prevent deformation or damage of the coil bobbin and the voice coil wound around the lower end of the coil bobbin, which would otherwise occur due to the twisting of the coil bobbin.

As is clear from the above effects, the present invention is suitable for mass production and realizes a speaker with stable quality, and is highly useful.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the speaker of the present invention, Fig. 2 is a partially cutaway perspective view of the joint between the yoke and the frame used in the speaker of the present invention, and Figs. 3 to 5 show the manufacturing of the joint of the present invention. 6 is a partially cutaway perspective view showing another embodiment of the joint, 4 is an upper yoke, 5 is a frame, 7 is a coil bobbin, 8 is a voice coil, 9 is a damper, and 11 is a process diagram showing the process. 15 is a protruding portion, a is a bent portion, and b is a punched portion.

Claims (1)

[Scope of utility model registration request] A magnetic circuit comprising a magnet and a yoke made of magnetic material and having a magnetic gap, a frame whose bottom portion is joined to the yoke of the magnetic circuit, and a voice coil to be inserted into the magnetic gap is wound around the lower end of the frame. A speaker formed of a coil bobbin, a damper provided across a middle part of the coil bobbin and a frame, and a diaphragm having a central part connected to an upper end of the coil bobbin and an outer periphery connected to an opening in the frame. The yoke and the bottom of the frame are joined together by applying pressure using a male mold on the yoke side and a female mold on the frame side with the yoke and the bottom of the frame overlapped. A protrusion of the engaged yoke and frame is formed, and the top of the engaged protrusion is further pressure-rolled using a new flat mold of the male mold described above, resulting in a plurality of joints. A speaker that is characterized by being