JP3427260B2 - Speaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker used in various audio equipments, in particular, facilitating the assembling and disassembling of a magnetic circuit, promoting the reuse of magnetic circuit parts, and reducing the loss of magnetic flux. The present invention relates to a speaker that can be optimally designed to reduce the number.

[0002]

2. Description of the Related Art Generally, the magnetic circuit of an outer magnet type speaker is
An inner peripheral surface of the top plate, which comprises a bottom plate having a center pole at the center of the top surface, a ring-shaped magnet mounted on the bottom plate, and a top plate provided on the top surface of the magnet. When mounting the voice coil in the magnetic gap formed between the center pole and the outer peripheral surface of the center pole, a gap gauge made of a material such as DURACON is used, and an acrylic adhesive is used to fix the top plate to the magnet. It is fixed by using adhesive.

On the other hand, in Japanese Utility Model Laid-Open No. 5-80096, when a magnetic circuit is magnetized without using a gap gauge in assembling a speaker, fine iron powder or the like existing in the space of the magnetic circuit is magnetized. In order to prevent adsorption to the gap, iron powder and / or magnet fragments in the space of the magnetic circuit are confined in the space and a ring with a substantially U-shaped or J-shaped cross section that can also serve as a gap gauge There is disclosed a magnetic circuit for electro-acoustic conversion, to which is attached.

[0004]

In the above-mentioned method of using an adhesive in assembling a magnetic circuit in an outer magnet type speaker, it takes ten or more minutes for the adhesive to cure,
The lead time cannot be compressed, and the step of removing the gap gauge is required after the adhesive has hardened, but since the gap gauge is used repeatedly, an appropriate gap is formed due to wear or adhesion of adhesive. As the adhesion becomes stronger, it takes more time to disassemble the magnetic circuit, and the parts constituting the magnetic circuit may be damaged and cannot be reused.

Further, the electroacoustic conversion magnetic circuit described in the above publication does not use a gap cage in assembling the magnetic circuit, and iron powder or magnet fragments that may occur during the assembling of the magnetic circuit. Although it has the effect of preventing adhesion to the magnetic gap, the magnet and top plate are naturally fixed with an adhesive as before, so the drawbacks of the general method are still solved. It hasn't arrived yet.

On the other hand, in the outer magnet type speaker, since the inner diameter and outer diameter of the magnet used are standardized by EIAJ (Japan Electronic Machinery Manufacturers Association), the outer circumference of the center pole of the bottom plate of the magnetic circuit, It is not possible to optimize the loss of magnetic flux caused by the gap formed between the inner circumference of the magnet and the inner circumference.

In other words, in the conventional outer magnet type speaker, the inner diameter of the magnet is set in proportion to the outer diameter.
In order to increase the magnetic flux density, it is necessary to increase the outer diameter of the magnet, but of course the inner diameter also increases accordingly, so the contradiction that the loss of the magnetic flux due to the gap increases cannot be resolved.

In view of the above problems, the present invention makes it possible to assemble a magnetic circuit very easily when manufacturing a speaker and disassemble the magnetic circuit so that the magnetic circuit parts can be reused and / or sorted and discarded. The purpose is to provide a speaker capable of playing.

Another object of the present invention is to provide a high-quality speaker with high magnetic flux density without changing the size of the magnet.

[0010]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention provides a required clearance between the bottom plate having a center pole and the outer circumference of the center pole. Is provided with a cylindrical guide ring capable of forming a ring-shaped magnet, and a ring-shaped magnet is arranged on the outer side thereof, and a plurality of engaging protrusions formed on the upper surface of the guide ring are formed corresponding to the engaging protrusions. The speaker is characterized in that a magnetic circuit is formed by inserting the magnetic circuit into the engagement holes of the ring-shaped top plate, and the magnetic circuit can be detachably held on the frame.

According to a ninth aspect of the present invention, a cylindrical guide made of a magnetic material is formed on a bottom plate having a center pole so that a required clearance can be formed between the bottom plate and the outer circumference of the center pole. With a ring,
A ring-shaped magnet is arranged on the outer side of the guide ring, and a plurality of engaging protrusions formed on the upper surface of the guide ring are formed in correspondence with the engaging protrusions and are inserted into the engaging holes of the ring-shaped top plate. A speaker having a magnetic circuit formed so that the magnetic circuit can be detachably held on a frame.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

The speaker 1 of the present invention is a speaker having an external magnet type magnetic circuit. As shown in FIG. 1, a required gap X is formed between the center pole 21 of the bottom plate 2 and its inner peripheral surface. A ring-shaped magnet 4 is arranged via a tubular guide ring 3 which is present, and an engaging projection 3 provided on the upper surface of the guide ring 3 on the magnet 4.
3 is used to mount the top plate 5 to form the magnetic circuit 6, the magnetic circuit 6 is housed in the bottomed cover member 7, and the cover member 7 is crimped and engaged with the frame 8. As a result, the magnetic circuit 6 is fixed to the frame 8 without using an adhesive or the like.

By adopting such a structure, the magnetic circuit can be assembled very easily and can be easily disassembled, and the magnetic circuit parts can be reused and / or separately disposed of. In addition to the above-mentioned effects, in addition to the above-mentioned action, by using a material that forms the guide ring is formed of a plastic magnet or the like that can be injection-molded and is used as a material that can form a speaker. It is possible to provide a high-quality speaker with high magnetic flux density without changing the size.

More specifically, in the magnetic circuit 6 of the speaker 1 of the present invention, the concave engaging portion 22 is formed along the outer periphery of the base end portion of the center pole 21 provided vertically at the center of the upper surface. The bottom plate 2 and the inner peripheral surface of the base end portion of the short cylindrical body 31 having an inner diameter larger than the outer diameter of the center pole 21 are in contact with the outer peripheral surface of the base end of the center pole 21, and the engaging portion. 22 has a bottom surface portion 32 that closely engages with the inside of the 22, and a plurality of engagement protrusions 33, 33 on the upper surface of the tip portion.
The guide rings 3 are arranged evenly with a required spacing, the ring-shaped magnets 4 are arranged in close contact with the outside of the guide ring 3, and concentric circles are provided on the upper surface of the guide ring 3. Engaging protrusions 33, 33 ...
And a ring-shaped top plate 5 placed on the upper surface of the magnet 4 and positioned.

The magnetic circuit 6 includes the bottom plate 2
The cylindrical guide ring 3 is inserted into the center pole 21 of the base end side from the base end side, and the bottom surface part 32 is closely fitted into the engagement part 22 of the bottom plate 2, and the center of the magnet to be applied by its outer diameter. After that, the ring-shaped magnet 4 is fitted on the outer side of the guide ring 3 and the magnet 4 is placed on the bottom plate 2.

In the case of obtaining a speaker having a high magnetic flux density, the guide ring 3 is formed by forming a cylindrical body of a required shape with a plastic magnet or the like which can be injection-molded, and magnetizing and using the cylindrical body. A guide ring having a complicated shape can be formed without changing the size of the magnet, and the gap X between the outer peripheral surface of the center pole 21 of the bottom plate 2 and the inner diameter of the magnet 4 is limited to the limit shown by the one-dot chain line in FIG. It is possible to obtain a high-quality speaker with high magnetic flux density by filling up to the position with magnetic material.
If this is not necessary, it may be made of a non-magnetic metal such as plastic or aluminum. (Refer to the inner peripheral surface of the guide ring 3 shown by the solid line)

The height of the magnet 4 is set so that the top is flush with the height of the guide ring 3 provided on the bottom plate 2, and the thickness of the guide ring 3 is adjusted according to the inner diameter of the magnet 4 to be used. It is indispensable to set (wall thickness of the cylindrical body 31) so that a necessary gap X is formed between the inner peripheral surface of the guide ring 3 and the outer peripheral surface of the center pole 21.

Next, engaging projections 33, 33, ... Protrudingly provided on the upper surface of the guide ring 3 are formed in the vicinity of the inner peripheral surface of the top plate 5 in correspondence with the engaging projections 33. , And the magnetic poles are formed by defining the positional relationship between the inner diameters of the center pole 21 of the bottom plate 2 and the top plate 5 to form a magnetic gap, but the engagement projection 33 does not protrude from the engagement hole 51.

At a required position on the upper surface of the top plate 5, the engaging projection 5 is engaged with a plurality of engaging holes arranged concentrically on the inner bottom portion 81 of the frame 8 with a required space.
2 is formed.

On the other hand, the frame 8 has an inner bottom portion 8
1, a ring-shaped peripheral wall 82 is integrally formed by molding such as plastic with a tip end extending downward as shown in FIG. 1, and a required space is provided on the outer peripheral surface thereof. The engaging groove 83 having a required width and shape is formed from the distal end portion toward the proximal end portion side, and the engaging groove 83 has a peripheral wall 8 as shown in FIG.
A concave guide portion a is formed on the outer peripheral surface of the lower end of 2, and a concave inclined portion b is formed continuously to the guide portion a and directed obliquely upward.

On the other hand, the inner peripheral surface is the peripheral wall 82 of the frame 8.
The bottomed cylindrical cover member 7 that comes into contact with the outer peripheral surface of the frame is formed by molding using a plastic material, for example, and the outer peripheral wall 8 of the frame 8 is formed on the inner peripheral surface thereof.
The engaging projection 71 that engages with the engaging groove 83 formed in No. 2 is formed corresponding to the engaging groove 83.

Therefore, the magnetic circuit 6 is placed in the cover member 7 with the bottom surface of the bottom plate 2 facing downward, and the engagement projection 71 formed on the inner peripheral surface of the cover member 7 is maintained while maintaining this state. When the engaging protrusion 71 is pushed along the engaging groove 83 formed on the outer peripheral surface of the peripheral wall 82 of the frame 8 along the engaging groove 83 and the cover member 7 is simultaneously rotated in the horizontal direction, the engaging protrusion 71 Is pushed upward along the engaging groove 83, and the frame 8 and the cover member 7 are pressed against each other via the magnetic circuit 6. Therefore, by locking this state by an appropriate means, without using an adhesive, The speaker 1 can be assembled.

There is no particular limitation on the locking means for the frame 8 and the cover member 7, but, for example, FIG.
As shown in FIG. 5, a stepwise meshing portion 84 is formed in a part of the engaging groove 83 formed in the outer peripheral surface of the peripheral wall 82 of the frame 8 (a part of the inclined portion b in FIG. 4), while the cover member is formed. The bottom surface of the engagement projection 71 formed on the inner peripheral surface of the step 7 is an inclined surface that engages with the inclined portion b, and a stepped meshing portion 72 that can mesh with the meshing portion 84 is formed on this inclined surface. However, it can be achieved by engaging them with each other.

In the loudspeaker of the above embodiment, when fixing the guide ring 3 to the bottom plate 2, a concave engaging portion 22 is formed on the upper surface of the bottom plate 2, and the engaging portion 22 is provided in the engaging portion 22. Although the bottom surface portion 32 of the guide ring 3 is formed to be in close contact with each other, the relationship between the guide ring 3 and the center pole 21 is fixed between the outer peripheral surface of the center pole 21 and the inner peripheral surface of the guide ring 3. The structure is not limited as long as it is a mechanism capable of forming a gap and maintaining the state.

Further, in the above embodiment, one means for detachably holding the magnetic circuit 6 to the frame 8 has been described, but the present invention is not limited to the embodiment of the present invention. A female two-thread screw is formed on the outer peripheral surface of the peripheral wall, a male two-thread screw that engages with the two-thread screw is formed on the inner peripheral surface of one guide ring 3, and means for engaging both is also adopted. What you can do is the frame 8
On the other hand, as long as the magnetic circuit 6 which can be assembled and disassembled can be detachably held, the structure thereof is not particularly limited.

Further, the frame is not limited in its structure as long as it has an inner bottom portion to which the cover member containing the magnetic circuit can be detachably mounted.

[0028]

According to the speaker of the present invention, a cylindrical guide ring is arranged outside the center pole that constitutes the bottom plate, and a gap is formed between the inner peripheral surface of this guide ring and the outer peripheral surface of the center pole. Then, the ring-shaped magnet is arranged on the outer side of the guide ring, and the top plate is placed on the magnet by using the engaging protrusion provided on the upper surface of the guide ring. Since the magnetic gap is formed by defining the positional relationship with the inner peripheral surface of the plate, the magnetic gap can be formed without using a gap gauge.

Further, the magnetic circuit can be assembled without using an adhesive agent, and the center of the magnet is provided by the outer diameter of the guide ring which is arranged outside the center pole with a required space, and the guide ring is also formed. By inserting a plurality of engaging protrusions formed in the engaging holes formed in the top plate corresponding to the engaging protrusions, the positional relationship between the center pole of the bottom plate and the inner diameter of the top plate is automatically determined. As a result, the magnetic circuit can be assembled quickly and easily.

Further, in the present invention, since the assembled magnetic circuit is detachably held on the frame, the speaker and the magnetic circuit can be easily disassembled, which has been impossible until now. It has become possible to reuse the previously used magnetic circuit parts and separate them.

Furthermore, in the present invention, in constructing the above-mentioned magnetic circuit, the guide ring is made of a plastic magnet which can be injection-molded, and by magnetizing the plastic magnet, the outer circumference of the center pole is Since the gap formed between the inner surface of the magnet and the magnet can be filled to the limit with a magnetic material, a speaker with a high magnetic flux density can be used in an external magnetic circuit without changing the size of the magnet used. It provides a great advantage in practical use such as being provided.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a preferred embodiment of a speaker of the present invention.

FIG. 2 is a partially cutaway front view of a guide ring forming a magnetic circuit of the speaker.

FIG. 3 is a perspective view showing a relationship between a bottom plate and a ring guide forming a magnetic circuit of the speaker.

FIG. 4 is an explanatory view showing a preferable mode for mounting a magnetic circuit in a cover member and fixing the cover member to a frame in the speaker.

FIG. 5 is a perspective view showing an engagement protrusion formed on the cover member.

[Explanation of symbols]

1 speaker 2 bottom plate 21 Center pole 3 Ring-shaped guide ring 33 engagement protrusion 4 ring-shaped magnet 5 Top plate 6 magnetic circuit 7 Cylindrical cover member 71 Engagement protrusion formed on the cover member 8 frames 81 Inner bottom of frame 82 frame wall 83 Engagement groove formed on the peripheral wall

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 101 H04R 9/02 102

Claims (10)

(57) [Claims] 1. A bottom plate having a center pole is provided with a cylindrical guide ring capable of forming a required gap with the outer periphery of the center pole, and a ring-shaped magnet is arranged outside thereof. Then, a plurality of engaging protrusions formed on the upper surface of the guide ring are formed corresponding to the engaging protrusions and are inserted into the engaging holes of the ring-shaped top plate to form a magnetic circuit. A speaker characterized in that it can be detachably held on a frame. 2. The bottom plate according to claim 1, wherein the bottom plate has an engaging portion on the outer peripheral portion of the base end of the center pole, which is capable of receiving a part of the base end portion of the guide ring. Speaker. 3. The speaker according to claim 1, wherein the guide ring is made of a non-magnetic material. 4. The tubular guide ring is made of a cylindrical body having a required thickness as a whole, and a part of a base end portion of the guide ring contacts an outer peripheral surface of a base end portion of the center pole. To form a required gap between the center pole and the outer peripheral surface of the center pole, and to provide a plurality of engaging protrusions on the upper surface with a required distance to engage with the top plate. The loudspeaker according to claim 1 or 3, wherein a positional relation of an inner diameter of the speaker is determined. 5. The top plate is integrally formed with a plurality of engagement protrusions corresponding to a plurality of engagement holes formed concentrically on the inner bottom portion of the frame with a required space. The speaker according to claim 1, wherein the speaker is a speaker. 6. The magnetic circuit is attached to the frame by
A frame having a ring-shaped peripheral wall formed on the outer side of the inner bottom is formed of a plastic material, and a bottomed cover member capable of containing the magnetic circuit is formed of a plastic material to cover the peripheral wall of the frame. The speaker according to claim 1, wherein the member is mounted while rotating, and the magnetic circuit is held in pressure contact with the frame. 7. The fixing of the magnetic circuit by the frame and the cover member is performed by forming a plurality of engaging protrusions on the inner peripheral portion of the cover member at required intervals and forming a concave shape corresponding to the engaging protrusions. Is formed on the outer peripheral portion of the peripheral wall of the frame, and the cover member is rotated in one direction while the engagement protrusion and the concave engagement groove are engaged with each other to crimp the two together to form the frame and the cover. The speaker according to claim 1 or 6, wherein the speaker is configured to be fixed. 8. The fixing of the magnetic circuit by the frame and the cover member is performed by forming a plurality of engaging protrusions on the inner peripheral portion of the cover member at required intervals and forming a concave shape corresponding to the engaging protrusions. Engaging groove is formed on the outer peripheral portion of the peripheral wall of the frame, and step-like steps are formed in the engaging protrusion and a part of the concave engaging groove that engages with the engaging protrusion. When the cover member is rotated in one direction while being engaged with the engaging groove and the both are pressure-bonded, the engaging protrusion and the engaging groove engage with each other, and the cover member is locked to the frame. The speaker according to claim 1 or 7. 9. A bottom plate having a center pole is provided with a cylindrical guide ring made of a magnetic material capable of forming a required gap between the bottom plate and the outer periphery of the center pole, and a ring-shaped guide ring is provided on the outer side thereof. Magnets are arranged, a plurality of engaging protrusions formed on the upper surface of the guide ring are formed corresponding to the engaging protrusions, and are inserted into the engaging holes of the ring-shaped top plate to form a magnetic circuit. A speaker characterized in that the magnetic circuit can be detachably held on a frame. 10. The speaker according to claim 9, wherein the guide ring is made by magnetizing a plastic magnet capable of injection molding.