JPH0879883A - Dome speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] In a dome-shaped speaker, the number of parts and the number of assembly work steps are reduced by devising the shape of the magnetic circuit and the front decorative plate, which is inexpensive, easy to assemble, and reliable in mounting. A dome-shaped speaker with excellent performance is obtained. [Structure] The upper plate 4 of the magnetic circuit is extended from the outer diameter of the ring-shaped magnet 3 and has a plurality of mounting holes 4a in the peripheral portion.
The inner diameter shorter than the outer diameter of the ring magnet 3 and the ring magnet 3
A plurality of fan-shaped holes 4b having an outer diameter longer than the outer diameter of
A guide protrusion 4c for positioning the diaphragm 8 is formed concentrically with the magnetic gap 5, and the outermost diameter is larger than the outer diameter of the fan-shaped hole 4b, and the outer surface of the fan-shaped hole 4b is drawn on the back surface near the outer peripheral portion. Hook-shaped projection 6 for hanging and locking to the upper plate 4
Front decorative plate 6 that also functions as a diaphragm 8 holding a
The front decoration plate 6 is fixed to the upper plate 4 by hooking the hook-shaped projection 6a on the outer diameter portion of the fan-shaped hole 4b, and the vibration plate 8 is also pressed and fixed at the peripheral portion of the center hole 6b. The configuration that has been done.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a dome-shaped speaker, and more particularly, a magnetic circuit component is also used as a speaker mounting flange, a front decorative plate is also used as a diaphragm fixing member, and a front decorative plate is used. The present invention relates to a dome-shaped speaker with extremely simple mounting means.

[0002]

2. Description of the Related Art A typical structure of a conventional electrodynamic loudspeaker is, as shown in FIG. 6, an annular magnetic element formed in a magnetic circuit composed of a pole 1, a lower plate 2, a ring magnet 3 and an upper plate 4. A speaker body having a structure in which a voice coil 9 coupled to a dome-shaped diaphragm 8 supported by an edge 7 is inserted in the space 5 is provided, and the dome-shaped diaphragm 8 is provided.
Is held at a predetermined position on the upper surface of the upper plate 4 inside a guide protrusion 4c for positioning the vibration plate formed on the upper surface of the upper plate 4, with a mounting screw or the like if necessary.

On the front surface of the speaker body, a mounting flange 10 having a central hole 10a through which the diaphragm 8 is exposed and a front decorative plate 11 are fixed by a mounting screw 12.

[0004]

The conventional speaker having such a structure has a mounting flange for mounting the speaker in a cabinet separately from the speaker main body composed of an electroacoustic transducer, as shown in FIG. 10 must be fixed to the magnetic circuit, and the front decorative plate 11 must also be attached with screws or the like. Since the number of parts is large and the screw fixing work is included, a lot of work time is required in the assembly process. There was a drawback to

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, uses the mounting flange as a magnetic circuit component, and devises the shape of the front decorative plate to reduce the number of components and facilitate the assembly. The purpose is to provide.

[0006]

A speaker according to the present invention for achieving the above object will be described with reference to the embodiments shown in FIGS. 1 to 5.
As shown in FIG. 1 showing the cross section of the embodiment, FIGS. 2 and 3 showing the magnetic circuit of the speaker body, and FIGS. 4 and 5 showing the front decorative plate, the pole 1, the lower plate 2, and the ring magnet 3 are shown.
And a dome-shaped diaphragm 8 supported by an edge 7 in an annular magnetic gap 5 formed in a magnetic circuit composed of the upper plate 4 and the upper plate 4.
In the electrodynamic dome-shaped speaker having a structure in which the voice coil 9 coupled to the above is inserted, the upper plate 4 is extended from the outer diameter of the ring-shaped magnet 3 and has a plurality of mounting holes 4a in the peripheral portion. A plurality of fan-shaped holes 4b having an inner diameter shorter than the outer diameter of the ring-shaped magnet 3 and an outer diameter longer than the outer diameter of the ring-shaped magnet 3 are formed concentrically with the magnetic gap 5, and the fan-shaped holes 4b are formed on the upper surface of the fan-shaped hole 4b. A central hole in which a magnetic protrusion 5 and a guide projection 4c for concentrically arranging the vibrating plate 8 which are arranged concentrically are formed inside, and the outermost diameter is larger than the outer diameter of the fan-shaped hole 4b and the vibrating plate 8 is exposed at the center. 6b is also provided, and also serves as a diaphragm 8 retainer on which a hook-shaped projection 6a for hooking the outer diameter portion of the fan-shaped hole 4b on the rear surface in the vicinity of the outer peripheral portion and locking the upper plate 4 is formed. The front decoration plate 6 is provided, and the hook-shaped protrusions 6a are fan-shaped holes. The dome-shaped speaker is characterized in that the front decorative plate 6 is fixed to the upper plate 4 by being hooked on the outer diameter portion of b, and the vibration plate 8 is also pressed and fixed at the peripheral portion of the center hole 6b. is there.

[0007]

In the dome-shaped speaker having such a structure, the upper plate 4 constituting the magnetic circuit is the ring-shaped magnet 4
A plurality of mounting holes 4a extending from the outer diameter of the
Since it has a function as a mounting flange by being perforated, a mounting flange as a separate member is not required unlike the conventional dome-shaped speaker.

There is no need for the work of mounting the mounting flange to the speaker body and the mounting member such as a screw unlike the prior art.

Further, a plurality of fan-shaped holes 4b having an inner diameter shorter than the outer diameter of the ring-shaped magnet 3 and an outer diameter longer than the outer diameter of the ring-shaped magnet 3 are concentric with the magnetic gap 5 in the upper plate 4. Since the holes are provided, the magnetic flux leaking from the magnetic circuit is small and the efficiency of the ring magnet 3 is increased.

Further, a hook-shaped projection 6a for hooking to the outer diameter portion of the fan-shaped hole 4b and engaging with the upper plate 4 is formed on the back surface of the front decorative plate 6 and the hook-shaped projection 6a. Is hooked on the outer diameter portion of the fan-shaped hole 4b, the front decoration plate 6 is fixed to the upper plate 4, and the vibrating plate 8 is also pressed and fixed at the peripheral portion of the center hole 6b. There is no need for the work of reattaching 6 to the speaker body or the attachment flange and the attachment member such as a screw.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention will be described in detail with reference to FIG. 1 showing a cross section of the speaker of the present invention and FIGS. A voice coil 9 coupled to a dome-shaped diaphragm 8 supported by an edge 7 is provided in an annular magnetic gap 5 formed in a magnetic circuit composed of a pole 1, a lower plate 2, a ring-shaped magnet 3 and an upper plate 4. The structure is an electrodynamic dome-shaped speaker with an inserted structure.

Referring to FIG. 2 showing the upper surface of the speaker main body from which the diaphragm 8 is removed and FIG. 3 showing the side section, in the magnetic circuit of the main body, the upper plate 4 is outside the ring magnet 3. A plurality of mounting holes 4a extended from the diameter to the periphery
And a plurality of fan-shaped holes 4b having an inner diameter shorter than the outer diameter of the ring magnet 3 and an outer diameter longer than the outer diameter of the ring magnet 3.
However, while being formed concentrically with the magnetic gap 5, a guide protrusion 4c for positioning the diaphragm 8 arranged concentrically with the magnetic gap 5 is formed on the upper surface inside the fan-shaped hole 4b. In order to form the guide protrusion 4c, it is possible to simply and precisely form the back surface of the upper plate 4 by half blanking.

Reference numeral 6 designates a front decorative plate whose outermost diameter is the fan-shaped hole 4b.
Center hole 6 that is larger than the outer diameter of
b is formed, and a hook-shaped projection 6a for engaging with the upper plate 4 by being hooked to the outer diameter portion of the fan-shaped hole 4b of the upper plate 4 of the magnetic circuit is formed on the back surface near the outer peripheral portion. It The hook-shaped projection 6a is integrally molded with the front decorative plate 6 with synthetic resin and has elasticity capable of being deformed by an external force.

The outside of the central hole 6b has a horn shape that is open outward to prevent resonance of sound waves, and the back surface is positioned so as to come into contact with a portion outside the edge 8 of the diaphragm 8 when mounted. A ring-shaped projection 6c is formed on the.

Further, the rear surface is inserted into the fan-shaped hole 4b,
Positioning projections 6d are formed on the upper surface of the upper plate 4 for abutting the edge portions of two adjacent fan-shaped holes 4b to position the front decorative plate 6 in the circumferential direction. .

When assembling the speaker, a diaphragm is placed and fitted inside the guide protrusion 4c on the upper surface of the upper plate 4 of the speaker main body, and the front decorative plate 6 is oriented in a predetermined position from above. When the positioning projections 6d are brought into close proximity to the upper plate 4 while being brought into contact with the end edges of two adjacent fan-shaped holes 4b, the hook-shaped projections 6a are moved by the outer edge of the fan-shaped holes 4b. The hook-shaped projection 6a is elastically returned to the outside when the front decoration plate 6 is in contact with the upper plate 4 while being bent inward and inserted into the fan-shaped hole 4b.
At this time, the hook-shaped protrusions 6a are hooked on the back surface of the upper plate 4 and fixed to the upper surface of the speaker body. At the same time, the diaphragm 8 is also pressed and fixed by the ring-shaped protrusion 6c of the center hole 6b to complete a dome-shaped speaker.

As another embodiment, with respect to the positioning of the front decorative plate 6, although not shown in the drawing, a cutout portion into which the hook-shaped projection 6a is fitted is provided at the outer peripheral edge of the fan-shaped hole 4b. In this case, by hooking the hook-shaped projection 6a on the hook-shaped portion, the positioning projection 6d can be omitted.

Further, when the front decoration plate 6 is attached, even if there is no ring-shaped protrusion 6c formed on the back surface, if the position of the central hole 6b has a dimensional relationship convenient for pressing the diaphragm, the ring-shaped protrusion 6c. 6c is not necessary to be provided.

Although the loudspeaker according to the present invention has been described above in detail based on the representative embodiments, the embodiment of the vibration system and the magnetic circuit system of the loudspeaker according to the present invention is limited to the structures of the above embodiments. However, the present invention can be appropriately modified and implemented as long as it has the constituents described in the above-mentioned claims, exhibits the action of the present invention, and has the effects described below.

[0020]

[Effect] The speaker according to the present invention has the following effects.

(1) Since the upper plate constituting the magnetic circuit is extended from the outer diameter of the ring-shaped magnet and a plurality of mounting holes are formed in the peripheral portion to have a function of a mounting flange, the conventional dome shape is used. There is no need for a mounting flange as a separate member like the speaker. Therefore, the parts cost of the mounting flange, the mounting member such as the screw, and the cost for mounting the mounting member are unnecessary, so that the manufacturing cost can be reduced.

(2) A plurality of fan-shaped holes having an inner diameter shorter than the outer diameter of the ring-shaped magnet and an outer diameter longer than the outer diameter of the ring-shaped magnet are formed in the upper plate as a central hole forming a magnetic gap. Since they are concentrically drilled, the outer diameter of the upper plate is smaller than the outer diameter of the ring-shaped magnet as a magnetic circuit, and as a result, the magnetic flux leaking from the magnetic circuit is small, making it an external magnetic circuit. The ring-shaped magnet is used more efficiently. Therefore, economic design becomes possible.

(3) Since the leakage magnetic flux is small, the adverse effect on the peripheral equipment sensitive to magnetism is small.

(4) When attaching the front decorative plate, the hook-shaped projection is hooked on the outer diameter portion of the fan-shaped hole to be fixed to the upper plate, and at the same time, the vibration plate is also a ring at the periphery of the center hole. Since it is pressed and fixed by the protrusions, the work of reattaching the front decorative plate and the diaphragm to the speaker body or the attachment flange and the attachment member such as the screw are unnecessary. Therefore, the manufacturing cost can be reduced.

With the above advantages, there is an effect that a speaker having excellent performance, stable operation, and easy to manufacture can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a speaker of the present invention.

FIG. 2 is a top view of a magnetic circuit portion.

FIG. 3 is a side sectional view of a magnetic circuit portion.

FIG. 4 is a rear view of the front decorative plate.

FIG. 5 is a side sectional view of a front decorative plate.

FIG. 6 is a cross-sectional view of a conventional speaker.

[Explanation of symbols]

 1 pole 2 lower plate 3 magnet 4 upper plate 4a mounting hole 4b fan-shaped hole 4c guide protrusion 5 magnetic gap 6 front decorative plate 6a hook-shaped protrusion 6b center hole 6c ring-shaped protrusion 6d positioning protrusion 7 edge 8 diaphragm 9 voice coil

Claims (1)

[Claims] 1. A dome-shaped diaphragm 8 supported by an edge 7 is connected to an annular magnetic gap 5 formed in a magnetic circuit composed of a pole 1, a lower plate 2, a ring magnet 3 and an upper plate 4. In the electrodynamic dome-shaped speaker having the structure in which the voice coil 9 is inserted, the upper plate 4 is extended from the outer diameter of the ring-shaped magnet 3 and has a plurality of mounting holes 4a and the ring-shaped magnet 3 in the peripheral portion. A plurality of fan-shaped holes 4b having an inner diameter shorter than the outer diameter of the ring-shaped magnet 3 and an outer diameter longer than the outer diameter of the ring-shaped magnet 3 are formed concentrically with the magnetic gap 5 and the magnetic gap 5 is formed inside the fan-shaped hole 4b. The vibrating plate 8 is formed concentrically with the guide protrusions 4c for positioning the vibrating plate 8, and the outermost diameter is larger than the outer diameter of the fan-shaped hole 4b and the vibrating plate 8 is centered.
A central hole 6b for exposing the upper plate 4 is formed on the back surface in the vicinity of the outer peripheral portion by being hooked on the outer diameter portion of the fan-shaped hole 4b.
The hook-shaped protrusion 6a is provided with a front decorative plate 6 which also serves as a holding member for the diaphragm 8 on which the hook-shaped protrusion 6a is formed.
Is attached to the outer diameter portion of the fan-shaped hole 4b to fix the front decoration plate 6 to the upper plate 4 and the vibration plate 8 is also pressed and fixed at the peripheral portion of the center hole 6b. Shaped speaker.