CN101053278A - Speaker and method of producing the same - Google Patents

Abstract

A loudspeaker and a manufacturing method thereof. A plate is pressed into a plate-shaped rectangular shape, and the periphery of each corner is stamped. A yoke body (1) provided with a tongue-shaped flange portion (1a) protruding outward from a position lowered by a predetermined dimension from an upper end surface is manufactured. A resin frame (2) is insert-molded so as to cover the flange portion (1a). A magnetic circuit in which a magnetic gap (5) is formed is manufactured by joining a magnet (3) in a yoke body (1). The diaphragm (6) to which the voice coil (7) is joined is joined to the frame (2). By manufacturing in this way, the bonding strength between the yoke body (1) and the frame (2) can be improved, and flattening of the loudspeaker can be realized. Moreover, gaps are eliminated at each corner of the yoke body (1), so that a loudspeaker with no flux leakage quality and excellent performance can be obtained.

Description

Loudspeaker and its manufacturing method

technical field

The present invention relates to a small and thin rectangular speaker used in various audio equipment and information communication equipment, especially in applications such as mobile phones where it is difficult to secure a speaker installation space, and a manufacturing method thereof.

Background technique

With the development of miniaturization and multi-function of various audio equipment and information communication equipment, the speakers used in these equipment are also increasing more than before, and the miniaturization is developing, especially for the speakers used in mobile phones, not only It is required to be miniaturized, but also required to have high sound quality. Against such a background, as a speaker for mobile phones where it is difficult to secure a speaker installation space, from the viewpoint of utilizing the limited space more effectively, emphasis has been placed on the development of a rectangular speaker compared to a general circular speaker.

FIG. 6 is a cross-sectional view showing the structure of such a conventional speaker, and FIG. 7 is a perspective view showing the structure of a yoke used in the speaker. In FIGS. 6 and 7, the yoke body 11 is formed into a bottomed shape by bending a thin plate-shaped magnetic metal material that has been punched out in advance to form bent portions 11a at four places. Box shape in rectangular shape. This reduces material loss of the yoke body 11 and improves productivity. In addition, by laminating the rectangular magnet 12 and the rectangular upper plate 13 in the yoke body 11 , a magnetic circuit in which the rectangular magnetic gap 14 is formed is formed.

The magnetic circuit is bonded to a frame 15 press-fitted into the yoke body 11 with an adhesive. Voice coil 16 is arranged to be embedded within magnetic gap 14 . Diaphragm 17 is coupled to voice coil 16 at its central portion and coupled to the peripheral edge of frame 15 at its peripheral edge.

In the conventional speaker configured in this way, voice coil 16 is vibrated up and down based on the magnetic field generated from magnetic gap 14 by inputting an audio signal to voice coil 16 embedded in magnetic gap 14 . And thereby, the vibration plate 17 coupled to the voice coil 16 vibrates up and down to reproduce sound.

In addition, JP-A-2003-37892 is known as prior art document information related to the invention of the present application, for example.

However, since the above-mentioned conventional loudspeaker is produced by bending a single piece of magnetic metal material to produce the yoke 11 constituting the magnetic circuit, a gap is formed at each corner of the rectangular yoke 11. . Therefore, magnetic flux leakage occurs from this gap, resulting in a decrease in performance such as a decrease in sound pressure due to a decrease in magnetic flux density. In addition, the leaked magnetic gas may have adverse effects on other electronic components densely installed around the speaker.

Contents of the invention

The present invention was made to solve such conventional problems, and an object of the present invention is to provide a loudspeaker and a method of manufacturing the same, whereby a loudspeaker having excellent quality performance without occurrence of magnetic flux leakage can be stably manufactured.

The loudspeaker of the present invention is composed of a magnetic circuit having a magnetic gap; a resin frame joined to the magnetic circuit; The outer periphery of the frame is combined, and the loudspeaker has the following structure: the magnetic circuit has a plate-shaped yoke formed in a rectangular shape and a magnet integrated in the yoke, and moves from a position lowered by a predetermined dimension from the upper end surface of the yoke to the Tongue-shaped flanges protruding outward are respectively provided at the respective corners, and the yoke is insert-molded in the frame so as to cover the flanges.

In addition, the manufacturing method of the loudspeaker of the present invention includes: pressing a flat magnetic metal material into a rectangular plate shape, and then punching the periphery of the upper end surface of each corner downward to make an integrally formed A step of lowering the yoke body with a tongue-shaped flange protruding outward at a position of a predetermined size; a step of insert-molding the yoke body in a resin frame so as to cover the tongue-shaped flange portion formed on the above-mentioned yoke body ; a step of manufacturing a magnetic circuit with a magnetic gap formed by joining a magnet to the yoke body; a step of joining a voice coil driven by a magnetic field generated from the above magnetic gap to a diaphragm; and joining the diaphragm joined to the voice coil to the Steps for frame bonding.

According to the above-mentioned present invention, by providing the tongue-shaped flange portion protruding outward from the position lowered by a predetermined dimension from the upper end surface of the yoke body at each corner, the tongue-shaped flange portion is covered with a resin-made flange. Embedding the shaped yoke body in the frame can not only greatly improve the bonding strength between the yoke body and the frame, but also realize flattening. In addition, by manufacturing the rectangular yoke in the shape of a plate, it is possible to stably provide a leak-free, high-performance speaker with gaps eliminated at each corner.

Description of drawings

FIG. 1 is a cross-sectional view showing the structure of a speaker manufactured by a speaker manufacturing method according to Embodiment 1 of the present invention.

Fig. 2 is a cross-sectional view showing a frame on which a yoke is insert-molded to be used in the speaker.

Fig. 3A is a plan view showing a yoke used in the speaker.

Fig. 3B is a front sectional view showing a yoke used in the speaker.

Fig. 3C is a side sectional view showing a yoke used in the speaker.

FIG. 4A is a diagram showing a method of manufacturing a yoke used in the speaker.

FIG. 4B is a diagram showing a method of manufacturing a yoke used in the speaker.

FIG. 4C is a diagram showing a method of manufacturing a yoke used in the speaker.

FIG. 4D is a diagram showing a method of manufacturing a yoke used in the speaker.

FIG. 4E is a diagram showing a method of manufacturing a yoke used in the speaker.

FIG. 4F is a diagram showing a method of manufacturing a yoke used in the speaker.

5 is a cross-sectional view showing the structure of a speaker manufactured by the speaker manufacturing method according to Embodiment 2 of the present invention.

Fig. 6 is a cross-sectional view showing the structure of a conventional speaker.

Fig. 7 is a perspective view showing a yoke used in the speaker.

In the figure: 1-yoke body; 1a-neck part; 2-frame; 2a-air vent; 3-magnet; 4-upper plate; 5-magnetic gap; 6, 10-vibration plate; 6a, 10a-edge; 7 , 9-voice coil; 8-cover.

Detailed ways

(Embodiment 1)

Hereinafter, the present invention will be described in conjunction with Embodiment 1.

FIG. 1 is a cross-sectional view showing the structure of a loudspeaker manufactured by a loudspeaker manufacturing method according to Embodiment 1 of the present invention. Fig. 2 is a cross-sectional view showing a frame on which a yoke is insert-molded to be used in the speaker. 3A, 3B, and 3C are a plan view, a front sectional view, and a side sectional view showing a yoke used in the speaker, respectively. In FIG. 1 , FIG. 2 , FIG. 3A , FIG. 3B , and FIG. 3C , the yoke body 1 is formed into a rectangular plate shape using a magnetic metal material. In addition, tongue-shaped flange portions 1 a are symmetrically provided on each corner portion and long side of the yoke body 1 , and the flange portions 1 a protrude outward from a position lowered by a predetermined dimension from the upper end surface of the yoke body 1 . By providing a collar portion at a position lowered by a predetermined dimension, the yoke body 1 and the frame 2 can be firmly fixed.

The air hole 2a is provided in the frame 2 made of resin. The frame 2 covers the tongue-shaped flange portion 1 a provided on the yoke body 1 , and when forming the frame 2 , the yoke body 1 is insert-molded. In addition, the bottom surface of the yoke body 1 protrudes from the bottom surface of the frame 2 after insert molding so that printing and stamping for displaying product numbers and batch numbers etc. can be easily performed on the bottom surface of the yoke body 1 .

A magnetic circuit having a magnetic gap 5 is constituted by the magnet 3 coupled inside the yoke body 1 and the upper plate 4 coupled above the magnet 3 .

The voice coil 7 is joined to the central portion of the diaphragm 6 on which the edge 6a is integrally formed on the outer periphery. The voice coil 7 is configured to be embedded in a magnetic gap 5 formed in the magnetic circuit. Then, when an audio signal is input to the voice coil 7, a magnetic field is generated from the magnetic gap 5, and the voice coil 7 vibrates up and down. Then, the diaphragm 6 coupled to the voice coil 7 is also vibrated up and down to reproduce sound. In addition, the cover 8 is used to protect the vibrating plate 6 .

4A to 4F are diagrams illustrating a method of manufacturing the yoke body 1 . Next, the manufacturing method will be described.

First, as shown in FIG. 4A , a plate made of a magnetic metal material is punched into a rectangular shape with a predetermined size. Then, as shown in FIG. 4B , the rectangular-shaped sheet material is extruded into a plate shape with a concave cross section by pressing.

Then, as shown in FIG. 4C , by pressing downward on the periphery of the upper end surface of the formed body formed into a rectangular dish shape, a flange protruding outward from a position lowered by a predetermined dimension from the upper end surface is integrally formed. department. Then, as shown in FIG. 4D , in the flange portion, only the flange portion formed at each corner portion remains, and the other portions are removed by punching.

Next, as shown in FIG. 4E , the remaining flange portion is processed to a predetermined thickness by pressing again. Finally, as shown in FIG. 4F , the unnecessary part of the outer shape of the flange portion is removed by punching, thereby producing the yoke body 1 integrally provided with the tongue-shaped flange portion 1 a.

In addition, the collar portion 1 a integrally provided on the yoke body 1 may be provided on the entire outer periphery of the yoke body 1 . However, it is difficult to provide the flange portion protruding outward by reducing the size of the entire body, and the flange portion may be partially broken in the middle due to insufficient stretching of the material. Like the collar portion shown in Embodiment 1 of the present invention, a structure such as partial symmetry is provided at each corner portion or the long side side, which is most effective and has good productivity.

In the speaker using the yoke according to Embodiment 1 manufactured in this way, a tongue-shaped collar portion 1 a protrudes outward from a position lowered by a predetermined dimension from the upper end surface of the yoke 1 . Furthermore, by insert-molding the yoke body 1 in the frame 2 so as to cover the collar portion 1a, not only the bonding strength between the yoke body 1 and the frame 2 can be greatly improved, but also flattening can be achieved. In addition, by forming the rectangular yoke body 1 in the shape of a plate, it is possible to stably manufacture a loudspeaker with no gaps at each corner, no flux leakage, and high quality performance.

(Embodiment 2)

Next, the present invention will be described in conjunction with Embodiment 2.

In Embodiment 2, the structure of the voice coil used in the speaker of Embodiment 1 is different. Since the structure other than this is the same as that of Embodiment 1, the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted. Hereinafter, only different parts will be described with reference to the drawings.

5 is a cross-sectional view showing the structure of a speaker manufactured by the speaker manufacturing method according to Embodiment 2 of the present invention. In FIG. 5 , the voice coil 9 is constituted by forming a coil of a predetermined pattern in a coiled state on the front and back sides of a resin base material.

The center of diaphragm 10 with edge 10 a integrally provided on the outer periphery is bonded to the base material of voice coil 9 excluding the coil, and voice coil 9 is disposed close to magnetic gap 5 above magnetic gap 5 without being in contact with it. Voice coil 9 is arranged to face magnetic gap 5 above magnetic gap 5 .

The base material of the central part of the vibrating plate 10 is rigid, and the edge 10a is formed of a soft material. Therefore, the degree of freedom of vibration of the diaphragm 10 is large, and a sufficient dynamic range of the sound emitted from the speaker can be ensured.

The speaker according to the second embodiment configured in this way has no magnetic flux leakage and is excellent in quality and performance, similarly to the speaker according to the first embodiment. Since the weight of the voice coil 9 is reduced and its shape can be easily changed, it is possible to manufacture speakers of various shapes that can be used when the installation space is limited.

Industrial availability

The loudspeaker of the invention has no magnetic leakage and has good quality and performance. Furthermore, the method for manufacturing a speaker of the present invention is useful as a method for manufacturing speakers and the like used in information communication devices such as mobile phones.

Claims (9)

1. A loudspeaker, having: Magnetic circuit with magnetic gap; a frame made of resin incorporating the magnetic circuit; and a vibration plate in which a voice coil driven by a magnetic field generated from the magnetic gap is combined with a central part, and a peripheral edge is combined with an outer circumference of the frame; The magnetic circuit has: a plate-shaped yoke formed in a rectangular shape, and a magnet incorporated in the yoke, The yoke body has a tongue-shaped flange protruding outward from a position lowered by a predetermined dimension from the upper end surface of the yoke body, And it is insert-molded in the said frame so that the said flange part may be covered. 2. Loudspeaker according to claim 1, characterized in that, The collar is provided at a corner of the yoke. 3. The loudspeaker of claim 1, wherein The flange portions are symmetrically provided on the long sides of the yoke. 4. The loudspeaker of claim 1, wherein A bottom surface of the yoke insert-molded in the frame protrudes from the bottom surface of the frame. 5. The loudspeaker of claim 1, wherein The voice coil forms a coil in a predetermined pattern on one surface of a resin base material in a coiled state. 6. Loudspeaker according to claim 5, characterized in that, The vibration plate is formed of resin, and a central portion of the vibration plate is bonded to a base material of the voice coil other than the coil. 7. Loudspeaker according to claim 6, characterized in that, In an upper portion of the magnetic gap, the voice coil is disposed close to the magnetic gap in a non-contact state. 8. A method of manufacturing a loudspeaker, comprising the steps of: Press the flat magnetic metal material into a rectangular plate shape; A tongue-shaped collar protruding outward from a position lowered by a predetermined dimension from the upper end surface of the yoke body is integrally provided by pressing the periphery of the upper end surface of each corner portion of the yoke body downward; insert-molding the yoke into a resin frame so as to cover the tongue-shaped collar formed on the yoke; a magnet is joined in the yoke to form a magnetic circuit forming a magnetic gap; engaging a voice coil driven by a magnetic field generated from said magnetic gap with the diaphragm; and The vibration plate to which the voice coil is joined is joined to the frame. 9. The manufacturing method of the loudspeaker according to claim 8, characterized in that, The method further includes the step of forming the voice coil by forming a coil of a predetermined pattern in a coiled state on one surface of the resin base material.

Images