JPS60182297A - Assembling method of speaker unit - Google Patents

Abstract

PURPOSE:To improve operational efficiency and to enhance reliability of products by inserting a jig into a speaker from a direction opposite to an installing direction of a diaphragm and coaxially assembling a voice coil functioning as vibrating system parts into a magnetic gap of a magnetic circuit with various speakers. CONSTITUTION:By inserting a jig 12 into a mounting hole 11a on a back plate 11 of an outer magnetic-formed magnetic circuit 2 in the form of half-finished product and by inserting a bobbin 5 to which a damper 7 is bonded with adhesives 13 at the inside of a bobbin storing part 12a of the outer periphery of the jig 12, the voice coil 6 is positioned inside a magnetic gap 14 of the circuit 2. The outer periphery part of the damper 7 is bonded to a frame 1 with adhesives 15. Then the jig 12 is pulled out of the bobbin 5, and the center cap periphery 4 of a diaphragm 3 is bonded to the upper end part from the inside of the bobbin 5. Then the outer peripheral edge part 3a of the diaphragm 3 is bonded to the outer edge part 1a of frame 1 with adhesives 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The first and second aspects of the present invention relate to a method for assembling a speaker unit.

Technical background of the invention and its problems Generally speaking, a speaker must be assembled by coaxially positioning a bobbin or a voice coil as a vibration system component within a magnetic gap of a magnetic circuit.

Here, to explain the conventional method of assembling a speaker, there is a method shown in FIG.

That is, a jig C is inserted from above into a bobbin b attached to a damper a, the damper a is bonded to a frame d with adhesive, and a voice coil g is inserted into a magnetic gear f of a magnetic circuit e. After positioning the
The speaker is assembled by adhering the inner circumferential portion of the diaphragm to the joint portion of the damper a, and then adhering the outer circumferential portion of the diaphragm to the upper flange portion d1 of the frame d with an adhesive.

However, the conventional assembly method described above is
With a cone-shaped diaphragm to which a cap is integrally assembled, the center camp interferes and the jig cannot be inserted, making it impossible to perform positioning work. Further, positioning cannot be performed on a flat diaphragm or a dome-shaped diaphragm.

Purpose of the Invention The first and second inventions of the present application have been made in view of the points mentioned above, and their object is to provide a cone-shaped diaphragm in which a diaphragm and a center cap are integrally formed. , various speakers using flat diaphragms, dome-shaped diaphragms,
The purpose of this invention is to provide a method for assembling a speaker unit that has a wide range of applications, such as coaxially assembling a voice coil as a vibration system component within the magnetic gap of a magnetic circuit, and that improves work efficiency.

Embodiments of the Invention Below, the first and second inventions of the present application will be explained together with a speaker unit according to FIGS. 1 to 3.

Note that the same parts are indicated by the same reference numerals in each figure.

1 is a frame fixed to the upper surface of the magnetic circuit 2; 3 is a cone-shaped diaphragm as a vibration system component; 4 is a center cap formed integrally with the diaphragm 3; 5 is a bobbin; 6 is a voice coil; 7 is a damper.

Further, the magnetic circuit 2 includes an annular top plate 8,
It is formed from a magnet 9 and a hack plate 11 having a mounting hole 11a in the center into which a ball piece 10 is to be fitted. The attachment hole 11a has a stepped structure in which the cross section is formed by a small diameter portion 11a1 and a large diameter portion 11a2. 10a is a fitting portion that fits into the mounting hole 11a.

Reference numeral 12 denotes a jig to be removably inserted into the several holes 11a from the direction opposite to the mounting direction of the diaphragm 3 (downward in the drawing). In order to support the center cap 4, it is formed into a substantially hemispherical shape that matches the inner shape of the center cap. Reference numeral 12a denotes a bobbin accommodating portion into which the bobbin 5 is inserted and for vertical positioning. 12b is a stepped fitting portion that fits into the mounting hole 11a of the back plate 11.

Next, to explain the first invention of the present application, first, as a first step, the jig 12 is inserted into the mounting hole 11a of the puncture plate 1 of the external magnetic circuit 2 as a semi-finished product. The bobbin 5 with the damper 7 adhered to it with the adhesive 13 is inserted into the bobbin accommodating part 12a on the outer periphery of the jig 12, and the magnetic circuit 2
The voice coil 6 is positioned within the magnetic gap 14 of.

As a second step, the outer peripheral part of the damper 7 is glued with adhesive 15.
Glue it to frame 1.

As a third step, the jig 12 is pulled out from the bobbin 5.

Thereafter, in a fourth step, the vicinity of the center cap 4 of the diaphragm 3 is bonded to the H end of the bobbin 5 from the inside with an adhesive.

As a fifth step, the outer peripheral edge 3a of the diaphragm 3 is attached to the frame 1.
It is adhered to the outer edge portion 1a of the frame with an adhesive 16.

As described above, in the first embodiment of the present invention, the jig 12 is inserted into the mounting hole 11a of the magnetic circuit 2 as a semi-finished product, and the bobbin 5 is fitted into the accommodation recess 12a of the bobbin 5. The voice coil 6 is inserted into the magnetic gap 14 of the magnetic circuit 2, and its mounting height and mounting position are determined coaxially.

In addition, since the top surface shape of the jig 12 is formed as a support portion to match the inner surface shape of the center cap 4, when the outer peripheral edge 3a of the diaphragm 3 is bonded to the frame 1 with the adhesive 16, The mounting height of the diaphragm 3 can be determined. Moreover, the jig 12 is removed from the mounting hole 11a, and the mounting hole 1
The bobbin 5 is bonded to the diaphragm 3 integrally formed with the center camp 4 by applying an adhesive 15 to the joint part of the diaphragm 3 from the inside of the bobbin 5 using 1a.

FIG. 4 shows a second embodiment of the present invention, which is different from the first embodiment in that the top surface of the jig 12 is formed into a hemispherical shape so as to fit and support the inner surface shape of the center cap 4. However, in this embodiment, an annular V-shaped groove 1 is provided above the jig 12.
2C+ on the upper surface of the cylindrical portion 12C, and this V
By fitting the inner edge of the cone-shaped diaphragm 3 directly into the groove 12C, the center camp 4, which is integral with the diaphragm 3, can be attached to the frame 1 to determine its position.

What is shown in FIG. 5 is a third embodiment of the present invention.

In contrast to the above embodiments, which use a cone-shaped diaphragm 3, this embodiment uses a flat diaphragm 3'.
This embodiment differs from the previous embodiment in that the jig 12 has a "-"-shaped surface for use with a hand so as to be applied to a speaker using a flat diaphragm 3' and to support a flat diaphragm 3'.

In any of the above embodiments, the mounting hole 11a provided in the plate 11 is formed in a stepped cross-sectional shape, and the fitting portion 12b of the jig 12 fitted therein and the ball・Although the fitting portion 10a of the piece 10 is formed slightly smaller, these numbers (not shown in the figure) may be formed in a tapered shape even if the cross-sectional shape is not large. The ball piece 10 may be formed in a straight wall shape.Moreover, the means for fixing the ball piece 10 to the bank plate 11 may be fitted, press-fitted, or bonded using an adhesive.

Moreover, in the case of the cone-shaped diaphragm 3, although the case where the center cap 4 is formed integrally with the diaphragm 3 is described, the present invention can be applied even if the diaphragm 3 is formed separately from the center cap 4. Needless to say, it can be applied.

Effects of the Invention Like the two series, the first and second inventions of the present application include the step of inserting the jig into the speaker from the opposite direction to the mounting direction of the diaphragm, so the cone and center cap are integrally formed. Even in various types of speakers using cone-shaped diaphragms, flat diaphragms, and dome-shaped diaphragms, the voice coil as a vibration system component can be installed coaxially within the magnetic gap of the magnetic circuit, which has a wide range of applications. Work efficiency is improved and product reliability is achieved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional assembly method using a jig, and Fig. 2 is a sectional view showing a first embodiment of the first invention of the present application, showing a state of assembling using a jig. FIG. 3 is a sectional view of the finished product, FIG. 4 is a sectional view of the second embodiment, and FIG. 5 is a sectional view of the third embodiment. 1...Frame, 2...Magnetic circuit, 3
, 3'... diaphragm, 4... center...
Cap, 5...Bobbin, 6...Voice coil, 7...Damper, 8...1
- Tsubu plate, 9... Magnet, 10.
...ball piece, 10a...fitting part, 11...back plate, 11a+...
...Large diameter part, 11a2...Small diameter part, 12...
...Jig, 12a...Bobbin storage section.

Claims (2)

[Claims] (1) A speaker unit characterized in that the mounting of the diaphragm includes a step of inserting a jig into the magnetic circuit from the opposite direction to position the voice coil as a vibration system component with respect to the magnetic circuit. Assembly is a method. (2) To install the diaphragm, insert a jig into the magnetic circuit from the opposite direction, and support part of the diaphragm with the support part provided on the jig to connect the voice coil's magnetic circuit and vibration. A method for assembling a speaker unit characterized by including a step of positioning it with respect to a board.