JPH0713351Y2 - Dome speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a suspension holding structure for a dome-type speaker.

(Prior Art) As a conventional speaker suspension holding structure, there is a structure shown in FIGS. 3 and 4. FIG. 3 is a cross-sectional view showing the right half of the conventional speaker, and FIG. 4 is an enlarged cross-sectional view of the main part of the speaker in FIG.

In the figure, the dome-shaped diaphragm member includes a dome-shaped diaphragm 6, a voice coil bobbin 9 extending from the lower end of the diaphragm 6, and an acoustic characteristic extending horizontally from the lower end of the voice coil bobbin 9. It is configured by integrally forming a suspension 4 for controlling the.

The magnetic circuit is composed of a yoke 2, a top plate 1 and a magnet 7. A center pole 2a is formed on the yoke 2, and the center pole 2a is further formed.
A pole step portion 2b is formed by protruding a part of 2a. Further, a step portion 1d is formed by cutting out the lower surface side of the end portion of the top plate 1 in the direction of the yoke 2. The yoke 2 and the top plate 1
Is configured to have a predetermined size such that a predetermined gap is formed between the pole step portion 2b and the step portion 1d when the magnetic circuit is assembled.

In assembling the dome-shaped diaphragm member and the magnetic circuit, first, the inner wall of the step portion 1d of the top plate 1 and the pole step portion 2b of the center pole step portion 2a are fitted together.

Next, the cushion material 8 is arranged on the upper and lower surfaces of the suspension 4 and fitted into the space formed between the step portion 1d and the pole step portion 2b.

(Problems to be solved by the invention) However, in the above-mentioned conventional dome type speaker,
Since it is necessary to form a step portion 1d that constitutes a space for arranging the suspension 4 and both cushion members 8 and 8 and a space for contacting the side surface of the pole step portion 2b in the top plate 1, The thickness of the top plate 1 becomes thicker than the usual one, and the shape of each component is complicated, resulting in an increase in cost.

Moreover, since the top plate 1 and the yoke 2 made of a magnetic material are in contact with each other, a magnetic short circuit is caused, and therefore, the magnetic flux density in the magnetic gap is reduced, so that the conversion efficiency is lowered. .

Further, since the cushioning materials 8 and 8 sandwich the suspension 4 in the vertical direction, there is no problem when the amplitude is small, but when the amplitude is large, the outer peripheral portion 4a of the suspension 4 and the step portion 1d of the top plate 1 come into contact with each other, There are drawbacks such as the generation of abnormal sounds.

This invention aims to eliminate the above-mentioned drawbacks.

(Means for Solving Problems) A suspension holding structure for a dome-type speaker according to the present invention has a dome-shaped diaphragm, a voice coil bobbin extending to a lower end of the diaphragm, and a horizontal shape formed from a lower end of the voice coil bobbin. In a dome-shaped speaker in which a dome-shaped speaker member composed of the above-mentioned suspension is arranged inside the magnetic circuit, a taper portion formed by inclining downward from the lower surface of the inner circular hole periphery and a flat surface extending at the end of the taper portion The clamp plate, the top plate that constitutes the magnetic circuit that forms the concave guide step formed at the end of the clamp part, the center pole that forms the magnetic circuit that forms the step, and the non-magnetic material. The inner circumference of the guide ring in the form of a falling edge, the suspension clamp part that is a flat surface, and the end of the suspension clamp part And a guide ring that holds the outer peripheral portion of the suspension of the dome-shaped speaker member having a guide ring outer peripheral portion of a rising shape that extends to the upper portion of the guide plate. A hole is drilled at a position corresponding to the dowel part in each of the suspension clamp part and the outer peripheral part of the suspension of the dome-shaped speaker member, and the inner peripheral part of the guide ring is the step part of the center pole and the outer peripheral part of the guide ring is top. The top plate is fitted into the guide step portions of the plate, and the dowel portion of the clamp portion of the top plate is inserted into the holes of the suspension clamp portion of the guide ring and the outer peripheral portion of the suspension of the dome-shaped speaker member. Clamp part and guide ring suspension The pension clamp portion holds and fixes the outer peripheral portion of the suspension of the dome-shaped speaker member by sandwiching it.

(Operation) The inner peripheral portion of the guide ring is fitted to the step portion of the center pole, and the outer peripheral portion of the suspension is clamped and fixed by the suspension clamp portion of the guide ring and the clamp portion of the top plate.

At this time, since the dowel portion is formed on the top plate and the holes are formed in the suspension and the guide ring portion corresponding to the dowel portion, respectively, the top plate and the suspension can be easily aligned.

(Embodiment) An embodiment of a suspension holding structure for a dome type speaker according to the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a cross-sectional view showing the right half of the speaker according to the present invention, and FIG. 2 is a cross-sectional view of the main part of the speaker in FIG. 1, which is the same as the conventional speaker described in FIGS. 3 and 4. The same reference numerals are given to the parts, and the description thereof will be omitted.

In the figure, reference numeral 1 denotes a top plate, and a portion on the lower surface side thereof against which the magnet 7 is abutted is a flat surface. A convex portion 1e having a step difference is formed downward by forging. The rising portion, which is the boundary between the convex portion 1e and the flat surface that abuts on the magnet 7, is a guide step portion 1a.

The flat surface of the convex portion 1e near the guide step portion 1a is a clamp portion 1c, and the clamp portion 1c is provided with at least one dowel portion 1f. Further, a tapered portion 1b is formed from the clamp portion 1c toward the inner diameter direction.

Reference numeral 2 is a yoke, and the pole step portion 2b is formed by forming the upper portion of the center pole 2a to have a slightly smaller diameter.

Reference numeral 3 is a guide ring made of a non-magnetic material, and a suspension clamp portion 3c formed on a flat surface corresponding to the clamp portion 1c, and a tapered portion 3d drawn so as to be symmetrical with the tapered portion 1b. And a rising guide ring outer peripheral portion 3a that fits with the guide step portion 1a and a falling guide ring inner peripheral portion 3b that fits with the pole step portion 2b. The suspension clamp portion 3c is formed with a round hole 3e into which the dowel portion 1f is inserted.

Further, a circular hole 4b for inserting the dowel portion 1f is provided near the outer peripheral end of the suspension 4 of the dome type diaphragm member. The portion on the outer peripheral side of the round hole 4b is a suspension outer peripheral portion 4a.
The size of 4a is set so that when the suspension 4 is inserted into the guide ring 3, it can be brought into contact with the inner wall of the guide ring outer peripheral portion 3a.

In the figure, 10 is a voice coil.

An example of assembly in the above configuration will be described. First, the magnet 7 is placed at a predetermined position of the yoke 2, and the guide ring inner peripheral portion 3b of the guide ring 3 is attached to the pole step portion 2b of the center pole 2a.
Press into.

Next, the suspension 4 is installed in the guide ring 3 so that the round holes 4b and 3e are aligned with each other. At this time, since the end portion of the suspension outer peripheral portion 4a is brought into contact with the inner wall of the guide ring outer peripheral portion 3a, centering can be easily performed.

Subsequently, the guide step portion 1a of the top plate 1 is press-fitted into the guide ring outer peripheral portion 3a, and the dowel portion 1f is inserted into the round hole 3e of the guide ring 3 through the round hole 4b provided in the suspension 4. . The top plate 1 is centered by the guide step portion 1a and the dowel portion 1f.

Therefore, the suspension 4 includes the clamp portion 1c of the top plate 1 and the suspension clamp portion 3c of the guide ring.
Since it is clamped by and the magnetic gap 11 is formed at the same time, the voice coil 10 can be arranged at the center position of the magnetic gap 11.

Even when the tapered portion 3d of the guide ring 3 has a step 3f as shown by the dotted line in FIG. 2, the same effect as described above can be obtained.

This device can be applied to a microphone.

(Effects of the Invention) According to the suspension holding structure of the speaker of the present invention, the following effects can be obtained.

By providing the dowels, the top plate, suspension, and guide ring can be easily aligned.

Since the magnetic gap is formed through the guide ring made of a non-magnetic material, the center pole and the top plate do not come into contact with each other and a magnetic short circuit does not occur. Therefore, since the magnetic flux in the magnetic gap is not reduced, the effect of the acoustic conversion rate is improved.

Further, when the guide ring is replaced with aluminum or a non-ferrous metal such as copper, the performance is further improved because it also has a short ring effect for reducing the eddy current generated in the center pole.

Since the plate thickness of the top plate can be reduced and the number of parts can be reduced, the cost can be reduced.

Since the shape of the center pole can be made very simple, there are advantages such as a reduction in processing cost.

Since the cushion material is not used, the outer peripheral portion of the suspension does not come into contact with other members even when the amplitude is large, and abnormal noise can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing the right half of the embodiment according to the present invention,
2 is an enlarged sectional view of an essential part in FIG. 1, FIG. 3 is a sectional view showing the right half of the conventional example, and FIG. 4 is an enlarged sectional view of an essential part in FIG. 1: Top plate, 1a: Guide step, 1b: Tapered part, 1c:
Clamp part, 1d: step part, 1e: convex part, 1f: dowel part, 2: yoke, 2a: center pole, 2b: pole step part, 3: guide ring, 3a: guide ring outer peripheral part, 3b: inside guide ring Perimeter,
3c: Suspension clamp part, 3d: Taper part, 3e: Round hole, 3f: Step, 4: Suspension, 4a: Suspension outer part, 4b: Round hole, 6: Vibration plate, 7: Magnet, 7a: Inner end part , 8: cushion material, 9: voice coil bobbin, 10: voice coil, 11: magnetic gap

Claims (1)

[Scope of utility model registration request] 1. A dome type speaker in which a dome type speaker member including a dome-shaped diaphragm, a voice coil bobbin extending to a lower end of the diaphragm, and a suspension formed horizontally from a lower end of the voice coil bobbin is disposed inside a magnetic circuit. In a speaker, a taper part that is formed by inclining downward from the lower surface of the inner circular hole periphery, a clamp part that is a flat surface that extends to the end part of the taper part, and a concave guide formed at the end part of the clamp part A top plate that forms a magnetic circuit that forms a step, a center pole that forms a magnetic circuit that forms a step, a guide ring inner peripheral portion that is made of a non-magnetic material, and has a flat surface, and a suspension that is a flat surface. The support of the dome-shaped speaker member having the clamp portion and the outer peripheral portion of the rising guide ring extending to the end portion of the suspension clamp portion. A guide ring for holding the outer peripheral portion of the pension, a dowel portion projectingly formed on the clamp portion of the top plate, and a suspension clamp portion of the guide ring and an outer peripheral portion of the suspension of the dome-shaped speaker member. A hole is drilled at a position corresponding to the dowel part, the inner circumference of the guide ring is fitted to the step part of the center pole, and the outer circumference part of the guide ring is fitted to the guide step part of the top plate. , And the dowel part of the clamp part of the top plate is inserted into each hole of the outer peripheral part of the suspension of the dome type speaker member. Holds the outer periphery of the suspension Dome loudspeaker, characterized in that holding by Rukoto and fixed.