JPH0259679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker unit member that can be easily assembled.

A conventional external magnetic type speaker unit, for example, a tweeter unit, is as shown in Fig. 1, in which 21 is a yoke, 22 is a center pole, 23 is a magnet, 24 is a top plate, and 25 is a voice. A coil bobbin, 26 a voice coil, 27 a diaphragm, 28 a damper, 29 a frame, 30 a spacer between the top plate 24 and the frame 29, 31 a lead wire, and 32 a terminal portion, respectively.

However, conventionally, when assembling each part, for example,
We use jigs according to the assembly process, such as a jig 33 for forming a magnetic gap as shown in Fig. 2 and a jig 24 for setting the voice coil center as shown in Fig. 3. These jigs were removed after each part was glued together.

For this reason, not only is the assembly work troublesome, but it also has the drawback of not being able to be assembled uniformly, which has been an obstacle to automating the manufacturing of speaker units.

In addition, as mentioned above, when using jigs and tools, the tolerance (backlash) of the jigs and tools must be acknowledged, which increases the gap and reduces the magnetic flux density.Moreover, the wiring process is performed after the bonding process. This made automation difficult.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional speaker unit, to enable uniform assembly without the need for jigs, to prevent a decrease in magnetic flux density in the magnetic gap, and to reduce assembly man-hours. An object of the present invention is to provide a speaker unit member that can be automatically assembled.

The speaker unit member of the present invention is a speaker unit member 1 used when assembling an external magnet type speaker unit, and includes a voice coil bobbin 3 and a stepped portion 25 provided to insert the voice coil bobbin 3. It has a substantially cylindrical shape, and the inner circumference of the cylindrical lower half 21 fits into the outer circumference of the center pole 12 of the yoke 11 when assembling the magnetic circuit section, and the outer circumference is used to position the magnet 13 when placing the magnet. , and when the top plate is disposed, the step 14a formed at the lower part of the inner circumference of the top plate 14 is aligned with the upper outer circumference 2.
4, the positioning member 2 has an inner diameter and an outer diameter, and the voice coil bobbin 3 is configured to position the top plate 14 by fitting the positioning member 2 to the voice coil bobbin 3.
An outer damper 4 extends from the positioning member 2 to the lower end of the voice coil bobbin to support the lower side of the voice coil bobbin 3, and an outer damper 4 extends from the voice coil bobbin 9 toward the upper surface of the center pole to support the upper side of the voice coil bobbin 3. It consists of an inner damper 5 and is integrally molded from synthetic resin.

Embodiments of the present invention will be described based on the drawings shown in FIG. Positioning member 2, voice coil bobbin 3, and outer damper 4
and an inner damper 5, all of which are molded from polyether sulfon or similar plastic.

The positioning member 2 is fitted onto the outer periphery of the center pole 12 of the yoke 11 when assembling the magnetic circuit section, and its outer periphery 23 positions the magnet 13 when the magnet 13 is placed. The top plate 14 is positioned by a stepped portion 14a formed at the lower inner circumferential side of the top plate 14 fitting into the upper outer circumferential portion 24.

The voice coil bobbin 3 is supported on the lower side by an outer damper 4 and on the upper side by an inner damper 5, and the outer damper 4 extends from the positioning member 2 to the lower edge of the voice coil bobbin 3. . Further, an inner damper 5 extends from the upper side of the voice coil bobbin 3 toward the upper surface of the center pole 12. The positioning member 2, voice coil bobbin 3, outer damper 4, and inner damper 5 are integrally molded, and by assembling the magnetic circuit section using the positioning member 2 with the voice coil 9 formed on the voice coil bobbin 3. A voice coil 9 is arranged at a predetermined position within the magnetic gap.

To explain the above-mentioned configuration in detail, the positioning member 2 has a substantially lower half 21 that is thick, and has an inner diameter that can fit into the outer circumferential surface of the center pole 12 and an outer circumferential portion 2 of the positioning member 2.
3 has an outer diameter into which the magnet 13 can fit,
The substantially upper half portion 22 is thin and has a stepped portion 25 into which the voice coil bobbin 3 is inserted. Inner dampers 4 extend from the inner circumferential surface 22a of the upper half portion 22 at four locations to reach the outer surface of the lower end portion of the voice coil bobbin 3, so as to support the lower portion of the voice coil bobbin 3. Further, the inner dampers 5 are provided extending from the upper inner surface of the voice coil bobbin 3 toward the upper surface of the center pole 12, and the inner dampers 5 are provided at four locations corresponding to the outer dampers 4. A ring-shaped support part 6 is formed at the tip of the voice coil bobbin 3, and by fixing this to the upper surface of the center pole 12, the upper part of the voice coil bobbin 3 is supported.

Reference numeral 7 denotes a molding hole formed in the lower half 21 of the positioning member 2 for molding the inner damper 4, which penetrates from the stepped portion 25 to the lower surface side, and its inner side is a thin wall portion. 7a. Reference numeral 8 denotes terminal holes formed downward from the stepped portion 25, which are formed at two symmetrical positions, and are bored through bosses 8a that protrude from the lower end surface of the lower half portion 21. A terminal fitting 10 is insert-molded in the hole 8. In addition,
This terminal fitting 10 may be arranged by press-fitting, caulking, etc., without insert molding.

A recess 3a corresponding to the coil winding width is formed on the outer peripheral surface of the voice coil bobbin 3, and the voice coil 9 is wound around the recess 3a and wired via a tinsel wire 10a or the like.

Reference numeral 15 indicates a diaphragm, 16 indicates a frame, and 17 indicates a center cap. The yoke 11 is provided with a fitting hole 11a corresponding to the boss 8a, and the outer circumferential surface of the center pole 12 is provided with a fitting hole 11a corresponding to the boss 8a. A stepped portion 12a is formed in the step portion 12a, into which the inner circumferential surface of the positioning member 2 is press-fitted. This stepped portion 12a
Since it may be substantially the same as the inner diameter of the voice coil, it can be mass-produced using conventional casting technology.
Reference numeral 12b denotes a support fixing recess formed on the upper surface of the center pole 12. A stepped portion 14a is formed on the inner peripheral portion of the lower surface of the top plate 14 so as to correspond to the positioning member 2, and the upper end outer peripheral portion 24 of the positioning member 2 is fitted into this step portion 14a. 2 and the stepped portion 14a, for example, as shown in FIG. 10, a dowel 14b or the like may be formed on either side for alignment.

Next, we will show an example of how to assemble a normal speaker unit.
To explain based on the figures and FIG. 13, first, the inner peripheral part of the lower half part 21 of the positioning member 2 is press-fitted to the outer peripheral surface of the center pole 12, and adhesive is applied to the upper surface of the yoke 11 to attach the magnet. Place 13.
In this case, by installing the magnet 13 so as to fit into the outer circumferential portion 23 of the positioning member 2, displacement of the position of the magnet 13 during placement can be prevented. Next, adhesive is applied to the upper surface of the magnet 13, and the top plate 14 to which the frame 16 has been previously fitted and fixed is placed. By press-fitting, it can be firmly fixed and bonded.

The magnetic circuit section is assembled as described above, which allows the voice coil 9 to be accurately positioned within the magnetic gap. In this case, since the outer damper 4 and the inner damper 5 are provided at the upper and lower parts of the voice coil bobbin 3, the voice coil 3 is supported at the upper and lower parts.For example, when assembling an edgeless speaker, it can be assembled with a high yield. can.

Note that when assembling a small, low-cost speaker unit, the magnetic circuit portion can be held only by press force and magnetic force without using adhesive when assembling the magnet 13 and top plate 14.

According to the speaker unit member of the present invention, a homogeneous member can be obtained by integrally molding the speaker unit member itself with synthetic resin, and
When assembling the magnetic circuit section using this, it can be assembled simply by press-fitting without using any jigs or tools, so the number of assembly steps can be significantly reduced. In particular, the positioning member is fitted to the outer circumference of the center pole, and the magnet and top plate are tightly fitted to the positioning member, so when assembling a low-cost speaker unit, for example, this pressure The magnetic circuit section can be held only by input and magnetic force, and there is no need to apply adhesive, etc., resulting in a significant cost reduction.

Furthermore, since no jigs are used during assembly, there is no need to consider jig tolerances, and the magnetic gap can be made as small as possible and the magnetic flux density can be increased. The voice coil can be placed accurately within the magnetic gap, and the wiring is easy, making it easier to automate the wiring process than in the past.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an example of a conventional speaker unit, and FIGS. 2 and 3 are cross-sectional views showing an example of how the conventional speaker unit is assembled. 4 to 14 show examples of the speaker unit member according to the present invention, FIG. 4 is a plan view of the speaker unit member, FIG. 5 is a partially sectional side view of the same, and FIG. 6 is a bottom view of the same. , FIG. 7 is a partially enlarged sectional view of the same as above, FIG. 8 is a partially enlarged side view of same as above, FIG. 9 is a partially sectional side view of the yoke, FIG. 10 is a bottom view of the top plate, and FIGS. FIG. 13 is a partially cutaway side view showing the assembly process, and FIG. 14 is a partially cutaway perspective view of the speaker unit member alone. DESCRIPTION OF SYMBOLS 1... Speaker unit member, 2... Positioning member, 3... Voice coil bobbin, 4... Outer damper, 5... Inner damper, 6... Support part, 9... Voice coil, 10... Terminal fitting,
11...Yoke, 12...Center pole, 13
...Magnet, 14...Top plate, 15
...Diaphragm, 16...Frame.

Claims (1)

[Scope of Claims] 1. A speaker unit member 1 used when assembling an external magnet type speaker unit, which includes a voice coil bobbin 3 and a stepped portion 25 provided to insert the voice coil bobbin 3. It has a substantially cylindrical shape, and the inner circumference of the cylindrical lower half 21 fits into the outer circumference of the center pole 12 of the yoke 11 when assembling the magnetic circuit section, and the outer circumference is used to position the magnet 13 when placing the magnet. The inner and outer diameters are such that when the top plate is disposed, the stepped portion 14a formed at the lower part of the inner circumferential portion of the top plate 14 fits into the upper outer circumferential portion 24, thereby positioning the top plate 14. and an outer damper 4 extending from the positioning member 2 to the lower end of the voice coil bobbin to support the lower side of the voice coil bobbin 3.
and an inner damper 5 extending from the voice coil bobbin 3 toward the upper surface of the center pole in order to support the upper side of the voice coil bobbin 3, and characterized in that these are integrally molded from synthetic resin. Speaker unit parts. 2. The speaker unit member according to claim 1, wherein the positioning member 2 is insert-molded with a terminal fitting 10 for wiring to the voice coil 9.