JP3001527U - Thin and lightweight speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] A magnetic circuit with a small number of parts and a structure that is easy to assemble is provided in the inner recess of the frame. [Structure] A top plate 3 is mounted on a mounting base 2 formed at the center of the inner bottom surface of an inner recess of a frame 1, and a short cylindrical magnet 4 having the same diameter as the top plate 3 or at least a small diameter is mounted on the top surface thereof. Then, a short cylindrical bottom plate 5 having the same diameter as the magnet 4 or at least a small diameter is placed and mounted thereon, and is closely fitted to the outer diameter of the upper ridge thereof. A bowl-shaped yoke 6 having a hole formed therein is attached, and a magnetic circuit 8 having an annular magnetic gap 7 formed between the top plate 3 and the outer edge portion of the bowl-shaped yoke 6 is provided. Voice coil 1 inside
1 so that the voice coil 11 can be supported loosely.
A structure attached to the frame 1 by a vibration system formed by a damper 13, a diaphragm 14 and the like that are concentrically fixed to a voice coil bobbin 12 around which is wound. [Effect] Lightweight, easy to handle, thin, has a high degree of freedom in mounting, and can eliminate leakage magnetism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lightweight thin speaker including a magnetic circuit having a small number of parts and having a structure easy to assemble in a frame recess.

[0002]

[Prior art]

 As shown in FIG. 3, a conventional speaker P of this type has a magnetic circuit 34 composed of a yoke 31, a top plate 32 and a magnet 35, and an annular magnetic gap is provided between the yoke 31 and the top plate 32. 33 is formed, the frame 40 is attached to the magnetic circuit 34, and the voice coil 36 connected to an external electric input is loosely supported in the magnetic gap 33. It is attached to the frame 40 by a vibration system formed of a damper 38, a diaphragm 39, and the like, which are concentrically fixed to a voice coil bobbin 37 on which is wound. Reference numeral 41 is a dust cap, and 42 is a gasket for pressing the outer periphery of the diaphragm 39 against the frame 40.

[0003]

[Problems to be Solved by the Invention]

 Therefore, in the conventional speaker P of this type, since the magnetic circuit 34 largely projects rearward and is bulky with the frame 40 as a boundary, and the frame height is added to the magnetic circuit 34, the overall height is further increased. Further, since the ring-shaped magnet 35 is exposed to the outside of the frame 40, magnetic leakage from the peripheral portion of the magnet 35 is large, and there is a possibility that it may magnetically affect other peripheral devices.

Therefore, in order to solve the problem that the conventional speaker P has, the present invention, as shown in FIG. 1, has a short cylindrical magnet 4 as a center and an assembled magnetic circuit 8 Is mounted in the inner recess of the frame 1 to form the annular magnetic gap 7 downward, and the voice coil 11 is mounted in the inner recess of the diaphragm 14 by mounting the acoustic radiation vibration system to minimize leakage magnetism. It is a thin and lightweight speaker equipped with the magnetic circuit 8 described above.

[0005]

[Means for Solving the Problems]

 The structure of the present invention for achieving the object will be described with reference to FIGS. 1 to 2C corresponding to the embodiments. The present invention is a mounting base formed in the center of the inner bottom surface of the inner recess of the frame 1. 2 has a top plate 3 mounted thereon, a short-length cylindrical magnet 4 having the same diameter as the top plate 3 or at least a small diameter is mounted on the upper surface thereof, and a short cylindrical bottom having the same diameter as the magnet 4 or at least a small diameter is mounted thereon. The plate 5 is placed and mounted, and a bowl-shaped yoke 6 having a recessed hole 6a formed in the inner bottom portion thereof, which fits tightly with the outer diameter of the upper ridge portion thereof, is attached to the top plate 3 and , A magnetic circuit 8 in which an annular magnetic gap 7 is formed between the voice coil 11 and the outer edge of the bowl-shaped yoke 6, and the voice coil 11 is loosely supported in the magnetic gap 7. Voice coil wound with coil 11 The damper 13 and concentrically fixed to the bottle 12, the vibration system is made form the vibrating plate 14, etc., it is devised of thin lightweight speaker A attached to the frame 1.

[0006]

[Action]

 Therefore, since the thin speaker A of the present invention has such a structure, the vibrating plate 14 and the damper 13 are centered on the annular magnetic gap 7 of the magnetic circuit 8, respectively. The outer periphery of the acoustic radiation vibration system in which the voice coil 7 and the voice coil bobbin 12 having the coil 7 attached thereto are concentrically fixed and assembled so that the voice coil 7 is located in the inner concave portion of the cone-shaped diaphragm 14. By mounting the parts on the frame 1, the magnetic circuit 8 can be positioned in the inner concave portion of the cone-shaped diaphragm, so that the parts protruding to the rear surface of the frame 1 can be eliminated, and thus the entire speaker A can be eliminated. Since the thickness of the speaker is the same as the height of the frame, the space factor of the speaker is significantly improved.

Further, when the frame 1 is made of a magnetic material such as an iron plate, the leakage magnetism of the magnetic circuit is magnetically shielded at the slope portion of the frame 1, so that it is magnetically connected to other devices around the speaker A. You can eliminate the fear of adverse effects.

Further, since the present invention has such a structure, as will be described later, not only is it convenient to use a simple assembling jig, but also it can be easily mounted on the manufacturing line for assembly. Therefore, productivity can be improved.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2A to 2C are views showing an embodiment of the present invention, FIG. 1 is a sectional view of a speaker, and FIGS. 2A to 2C are sectional views showing an assembly process of a speaker of the present invention. It is a figure.

Reference numeral 1 is a frame in which a mounting base 2 is formed at the center of the inner bottom surface of the inner recessed portion, and 3 is a top plate mounted on the mounting base 2, the side surface of which serves as the inner magnetic wall of the annular magnetic gap 7. . 4 is a short cylindrical magnet having the same diameter or at least a small diameter as the top plate 3 mounted on the upper surface thereof, and 5 is a short cylindrical bottom having the same diameter as the top plate 3 or at least a small diameter mounted on the magnet 4. It is a plate.

Reference numeral 6 denotes a bowl-shaped yoke that is attached to the bottom plate 5 and has a concave hole 6 a formed in the inner bottom portion thereof, and the concave hole 6 a is dense with the outer diameter of the upper ridge portion of the bottom plate 5. And the side wall inner surface of the side wall of the top plate 4 serves as an outer magnetic wall of the annular magnetic gap 7 to form an annular magnetic gap 7 opening downward. Make up. The top plate 3, the small-diameter short cylindrical bottom putt 5 and the bowl-shaped yoke 6 are all made of soft iron material that is magnetically soft, and the magnet 4 has a small leakage due to its shape and aspect ratio, and neodymium has less magnetic efficiency. Is high and is desirable in terms of characteristics.

A diaphragm 14 and a damper 13 are bonded at their central portions, and a voice coil 11 connected to an external electric power input thereto, and a voice coil bobbin 12 having the voice coil 11 attached to the voice coil 11 are vibrated in a cone type vibration. An acoustic radiation vibration system is formed by concentrically fixing and assembling and joining so as to be located in the inner concave portion of the plate 14, and the voice coil 11 is loosely supported in the annular magnetic gap 7. The outer peripheral portions of the damper 13 and the diaphragm 14 are attached to the frame 1, and the vibration system is attached to the frame 1. In order to shield the leakage magnetism and prevent it from leaking to the outside, the frame 1 is preferably made of a magnetic material.

Reference numeral 10 is a gasket that presses the outer periphery of the diaphragm 14 against the frame 1. As described above, the magnetic circuit 8 of the speaker A of the present invention has a structure in which the short cylindrical magnet 4 is incorporated inside and the annular magnetic gap 7 that opens downward is formed, and the number of parts is small and the structure is easy to assemble. The thin speaker has an acoustic vibration system in the inner recess of the frame 1.

The operation of the thin speaker having the magnetic circuit of this embodiment configured as described above will be described. Since the magnetic circuit 8 can be arranged in the inner concave portion of the cone-shaped diaphragm, the parts protruding to the rear surface of the frame 1 can be eliminated, so that the thickness of the entire speaker A becomes the same as the height of the frame. Therefore, the space factor of the speaker is significantly improved. Further, when the frame 1 is made of a magnetic material such as an iron plate, the leakage magnetism of the magnetic circuit is magnetically shielded at the slope portion of the frame 1, so that other devices around the speaker A are adversely affected magnetically. You can eliminate fear.

In addition, based on the speaker structure of the present invention, a ring-shaped magnet is used instead of the cylindrical magnet to form a magnetic air gap opening downward and a magnetic air gap opening upward. By using the former magnetic space for woofers and the latter magnetic space for tweeters, it is possible to expect the possibility of constructing a thin two-way speaker as a whole.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments, and is provided with the above-mentioned configuration requirements of the present invention, and The present invention can be carried out by appropriately modifying it within a range that achieves the object of the present invention and has the following effects.

[0017]

[Effect of device]

 As is apparent from the above description, the present invention utilizes the assembly jig by the center hole formed in the center of each part and the convex centering guide of the other part, and Centripetal assembly can be performed extremely easily, accurately and accurately.

For example, as shown below (FIGS. 2A-2C): a. The voice coil bobbin 12 around which the voice coil 7 is wound is concentrically supported by using the jig 50 on the inner concave side of the cone type diaphragm 14 and the cone type diaphragm 14 and the damper 13 are bonded to each other. Assemble the vibration system. (FIG. 2A) (Jig 50 is removed after drying the adhesive) b. The mounting base 2 formed on the inner bottom of the center of the frame 1 and the lower surface recess 3a of the magnetic circuit top plate 3 are fitted and bonded. (FIG. 2B) c. The short cylindrical magnet 4 is concentrically adhered to the upper surface of the magnetic circuit top plate 3 by using a jig 51. (FIG. 2B) d. The bottom plate 5 is concentrically attached to the upper surface of the magnet 4 using a jig 51. (FIG. 2B) (Remove jig 51 after drying the adhesive) e. The a. The vibrating system (7, 11, 12, 13) assembled in step 1 is attached to the frame 1 by using the gap holding jig 52 on the head of the top plate 3 and the outer edges of the damper 13 and the vibrating plate 14, respectively. Then, the gasket 10 is pressed and fixed. (FIG. 2C) (Jig 52 is removed after the adhesive is dried)

Above a. ~ E. According to the process, a simple jig can be used to assemble and complete a thin speaker extremely accurately and accurately (Fig. 1). It is expected to have a practical advantage, which is a manufacturing advantage. Was reached.

As is apparent from the above description, in the speaker of the present invention, the attached magnetic circuit incorporates a single magnet, and the use efficiency is extremely good, and the magnetic circuit with very little magnetic leakage is used. Therefore, its application is widely spread over a wide range, and since the rear part is magnetically shielded by the magnetic material frame, the leakage of magnetic leakage is further reduced.

That is, as an example of the above-mentioned development, one magnetic circuit can operate two sets of speakers, and it is not only an extremely excellent speaker for HiFi reproduction, but also an occupied speaker compared with a conventional speaker. Since the product ratio is extremely small, there is a great deal of convenience in its mounting location.

Further, as compared with the case of assembling two sets of speakers separately, it is possible to reduce the cost of parts materials and the number of steps, and there is a remarkable effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an assembled cross section of a thin speaker according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view showing the assembly process of the vibration system.

FIG. 2B is a view in which the mounting base formed in the inner bottom portion of the center of the frame and the recessed portion on the lower surface of the magnetic circuit top plate are fitted to each other, and the short columnar magnet is attached to the upper surface of the magnetic circuit top plate, and the bottom plate is attached to the magnet. Sectional drawing which shows the process of concentrically adhering to the upper surface using a jig.

FIG. 2C is a perspective view of the assembled vibration system shown in FIG. 1, in which a gap holding jig is used on the head of the top plate to bond the outer edges of the damper and the vibration plate to the frame, and the gasket is pressed to fix them. FIG.

FIG. 3 is a central longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 1 frame 2 mounting base 3 top plate 4 magnet 5 bottom plate 6 bowl-shaped yoke 6a concave hole 7 magnetic gap 8 magnetic circuit 10 gasket

Claims (1)

[Scope of utility model registration request] 1. A top plate (3) is mounted on a mounting base (2) formed at the center of the inner bottom surface of an inner recess of a frame (1), and a short cylindrical magnet (4) having the same diameter as or at least a small diameter of the top plate (3) is mounted on the top surface thereof. The cylindrical bottom plate 5 having the same diameter as the top plate 3 or at least a small diameter is mounted and mounted thereon, and the inner bottom portion is closely fitted with the outer diameter of the upper ridge. A bowl-shaped yoke 6 having a hole 6a formed thereon is attached, and a magnetic circuit 8 having an annular magnetic gap 7 formed between the top plate 3 and an outer edge portion of the bowl-shaped yoke 6 is provided. The voice coil 11 is supported by the voice coil 11 in the space 7 by a vibrating system including a damper 13, a diaphragm 14 and the like, which are concentrically fixed to the voice coil bobbin 12 around which the voice coil 11 is wound so as to be supported loosely. , The frame Thin and lightweight speaker A attached to dome 1.