WO2015096527A1

WO2015096527A1 - Flat-diaphragm structure micro speaker

Info

Publication number: WO2015096527A1
Application number: PCT/CN2014/087399
Authority: WO
Inventors: 汪珍珍; 王凯; 徐金国
Original assignee: 汉得利（常州）电子股份有限公司
Priority date: 2013-12-25
Filing date: 2014-09-25
Publication date: 2015-07-02
Also published as: CN103648073A

Abstract

The present invention relates to a flat-diaphragm structure micro speaker, the structure comprising a positioning support, a magnetic circuit device, a coil and a diaphragm; the diaphragm fits the surface of the coil; the coil is fixed via the positioning support and is formed by cladding the FPC board; the magnetic circuit device comprises an upper layer and a lower layer, the two layers sandwiching an FPC board and having the same magnetic poles on the opposite positions thereof; the coil is disposed in the magnetic gap between the upper layer and the lower layer of the magnetic device, and the shape of the coil matches the magnetic gap. The present invention can not only minimize the thickness of the speaker to H2.0 mm, following the trend of thinner and smaller mobile phones and tablets, but also enables an H2.0 mm speaker to have the same performance as an H3.5 mm speaker, thus ensuring high performance of the speaker while reducing the thickness thereof. In addition, the present invention has a simple structure, is easy to manufacture and of low cost, and has practicality and high efficiency.

Description

Flat membrane structure microspeaker

Technical field

The present invention relates to a speaker, and more particularly to a flat membrane structure microspeaker.

technical background

The gradual thinning of mobile phones has become the market development trend of the market in the next few years. The technicians will develop moving-type speakers that are thinner than the market to meet the demand for subsequent thinning of mobile phones and communication products. This is also the development of the speaker market. The inevitable trend.

At present, the thickness of mobile phone speakers at home and abroad is generally H3.5mm and H3.0mm, and the thinnest speaker can achieve H2.5mm thickness, but the performance of H2.5mm thickness speaker is far from the performance of H3.5mm speaker. As the development trend of mobile phones is thinner, the space left for the speakers is getting smaller and smaller, the performance requirements of the speakers are getting higher and higher, and the thickness requirements are getting thinner. The thickness of the current speakers is gradually unable to meet the requirements of mobile phones. Therefore, the present invention has devised a flat membrane structure microspeaker to solve the above problem, and to make the future of the speaker thinner without affecting the high performance of the speaker.

The speaker in the actual technology is shown in FIG. 6, which comprises a moving coil type coil 15, a positioning bracket 1, a magnetic circuit device and a diaphragm 3. The magnetic circuit device is composed of a magnetic ring 7 and a magnet 8, and the diaphragm 3 is attached. On the outer surface of the moving coil 15 , the moving coil 15 surrounds the outer surface of the magnet 8 , and the moving coil 15 generates a magnetic field after being energized and forms a magnetic circuit with the magnetic circuit device, and the moving coil 15 is magnetically Under the action, the diaphragm 3 will vibrate up and down to make a sound. However, the moving coil is coiled by a copper wire. If the performance of the speaker is to be improved, it is necessary to increase the length of the moving coil 15. When the length of the moving coil 15 is increased, the thickness is also inevitably increased. Thus, it has a thicker thickness H2, and when using the moving coil type, space needs to be reserved between the magnetic circuit device and the moving coil 15 to prevent the moving coil line. When the ring 15 vibrates up and down, it collides with the magnetic circuit device to cause a disconnection. With the development of the mobile phone and tablet market, the space reserved for the speaker in mobile phones and tablets will become smaller and smaller, but the moving coil 15 itself has a thicker thickness H2, and the magnetic circuit device during installation Space is also required to be reserved with the moving coil 15 so that existing speakers cannot meet the development needs of mobile phones and tablets.

Chinese Patent No. CN102651840A discloses a speaker, the structure of which comprises a main body of a speaker, the diaphragm is a flat plate type, the edge of the diaphragm is connected to the main body of the speaker, an intermediate block is arranged at an edge region of the diaphragm, and the intermediate block is located at the vibration. Between the membrane and the body, the intermediate block is an elastic material. The speaker of the invention cannot guarantee the high performance of the speaker under the condition of reducing the thickness, and it cannot adapt to the market trend of thinner and thinner mobile phones and tablets.

Summary of the invention

The technical problem to be solved by the present invention is to make the thickness of the speaker to be H2.0 mm, and to make the performance of the speaker the same as that of the speaker of H3.5 mm thickness; and to provide a flat-film structure micro-speaker.

In order to solve the above technical problem, the structure of the present invention comprises a positioning bracket, a magnetic circuit device, a coil and a diaphragm. The diaphragm is attached to the surface of the coil, and the coil is fixed by the positioning bracket; the coil is formed by plating on the FPC board. The magnetic circuit device is divided into upper and lower layers, and the FPC board is placed between the upper and lower magnetic circuit devices. The magnetic poles of the upper and lower magnetic circuit devices are the same, and the coil is placed in the magnetic gap of the upper and lower magnetic circuit devices. The shape of the coil matches the shape of the magnetic gap.

Further, the positioning bracket is provided with a hanging arm around the positioning bracket, and the positioning bracket is respectively connected with the upper and lower magnetic circuit devices through the hanging arm, and the positioning bracket further has a signal input end, a signal output end, a first connecting end and a first Two connectors.

Further, the magnetic circuit device is composed of a fixed frame, a magnetic ring and a magnet, and a plurality of magnetic rings are horizontally spliced and placed in the fixed frame, and a magnet, a magnet and a magnetic ring are arranged in the middle of each magnetic ring. Interform The magnetic gap is formed, and the shape of the magnetic gap is matched with the shape of the coil. The magnetic poles of the adjacent two magnets are opposite, and the fixing bracket is connected to the positioning bracket through the hanging arm.

Further, the upper and lower surfaces of the FPC board are plated with coils, and the coils on the lower surface of the FPC board are connected through the first connection end, the coils on the surface of the FPC board are connected to the signal input end, and the coils on the lower surface of the FPC board are connected. Connected to the signal output through the second connection.

Still further: the coating is a cyclic coating.

After adopting the above structure, the invention can not only make the thickness of the speaker H2.0mm, but also meets the trend that the mobile phone and the tablet computer market become thinner and smaller, and the size is smaller and smaller; and the performance of the speaker with H2.0mm thickness can be made. The performance is the same as the thickness of H3.5mm, and the high performance of the speaker is guaranteed under the condition of reducing the thickness of the speaker. Moreover, the invention has the advantages of simple structure, easy manufacture, low cost, practicality and high efficiency.

DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

Figure 1 is a schematic view of the structure of the present invention.

2 is a schematic structural view of a coil and a positioning bracket.

Figure 3 is a schematic view showing the structure of a magnetic ring and a magnet.

4 is a schematic view showing the position of a coil and a magnetic circuit device.

Figure 5 is a diagram showing the force of the coil in the present invention.

Fig. 6 is a diagram showing the force of a moving coil type coil in the prior art.

In the figure: 1 is the positioning bracket, 2 is the coil, 3 is the diaphragm, 4 is the FPC board, 6 is the fixed frame, 7 is the magnetic ring, 8 is the magnet, 10 is the hanging arm, 11 is the signal input end, 12 is the signal Output end, 13 is the first connection end, 14 is the second connection end, 15 is a moving coil type

detailed description

As shown in FIG. 1, FIG. 4 and FIG. 5, a flat membrane structure microspeaker comprises a positioning bracket 1, a magnetic circuit device, a coil 2 and a diaphragm 3, and the diaphragm 3 is attached to the upper surface of the coil 2, and the coil 2 is fixed by the positioning bracket 1; the coil 2 is formed by plating on the FPC board 4, the magnetic circuit device is divided into upper and lower layers, and the FPC board 4 is placed between the upper and lower magnetic circuit devices, and the upper and lower layers are magnetic The magnetic poles of the relative position of the road device are the same, the coil 2 is placed between the magnetic gaps of the upper and lower magnetic circuit devices, and the shape of the coil 2 matches the shape of the magnetic gap. The coil 2 of the present invention is formed by plating a coil 2 on the FPC board 4 to reduce the thickness of the coil 2 to H1, which is greatly reduced compared to the thickness of the coil 2 of the prior art, thereby providing a reduction in the thickness of the speaker. space. The present invention generates a magnetic field by energizing the coil 2 on the FPC board 4 to cause the coil 2 to generate a magnetic field under the condition of energization, so that the coil 2 and the magnetic circuit device connected to the upper and lower ends of the coil 2 form a magnetic circuit, so that the FPC board 4 and the coil 2 are formed. The magnetic force is applied in the vertical direction, and the FPC board 4 and the coil 2 vibrate up and down together with the diaphragm 3 by the magnetic force, thereby causing the diaphragm 3 to sound. The present invention forms a coil 2 on the FPC board 4 and a magnetic circuit device disposed at the upper and lower ends of the coil 2 to reduce the thickness of the speaker under the condition of ensuring high performance, so that the speaker of H2.0 thickness has H3. .5 thickness of high performance, in response to the market trend of thinner mobile phones and tablets.

The speaker in the actual technology is shown in FIG. 6, which comprises a moving coil type coil 15, a positioning bracket 1, a magnetic circuit device and a diaphragm 3. The magnetic circuit device is composed of a magnetic ring 7 and a magnet 8, and the diaphragm 3 is attached. On the outer surface of the moving coil 15, when the moving coil 15 is energized, a magnetic field is generated and a magnetic circuit is formed with the magnetic circuit device, and the moving coil 15 is vibrated by the diaphragm 3 by the magnetic force. However, the moving coil is coiled by a copper wire. If the performance of the speaker is to be improved, it is necessary to increase the length of the moving coil 15. When the length of the moving coil 15 is increased, the thickness is also inevitably increased. Therefore, it has a thicker thickness H2, and when the moving coil type coil is used, a space needs to be reserved between the magnetic circuit device and the moving coil 15 to prevent the moving coil 15 from vibrating up and down. The magnetic circuit device collides and breaks line. With the development of the mobile phone and tablet market, the space reserved for the speaker in mobile phones and tablets will become smaller and smaller, but the moving coil 15 itself has a thicker thickness H2, and the magnetic circuit device during installation Space is also required to be reserved with the moving coil 15 so that existing speakers cannot meet the development needs of mobile phones and tablets. Therefore, the present invention replaces the conventional moving coil type coil 15 by circulating a plating layer on the FPC board 4, and the thickness of the coil 2 formed on the FPC board 4 is only H1, and H1 is much smaller than H2, and the present invention is reduced by The thickness of the coil 2 itself provides space for reducing the thickness of the speaker, and the coil 2 on the FPC board 4 does not break like a moving coil during vibration, so the magnetic circuit control and the coil 2 are not used. Reserved space. The present invention replaces the moving coil 15 by circulating a plating layer on the FPC board 4, thereby reducing the thickness of the speaker to cope with the market trend of thinner handsets and tablets.

As shown in FIG. 2, the positioning bracket 1 is provided with a hanging arm 10, and the positioning bracket 1 is connected to the magnetic circuit device at the upper and lower ends by the hanging arm 10. The positioning bracket 1 is further provided with a signal input end 11 and a signal output end 12 The first connection end 13 and the second connection end 14. The upper and lower surfaces of the FPC board 4 are plated with coils 2, and the coils 2 on the upper and lower surfaces of the FPC board 4 are connected through the first connection end 13, and the coil 2 on the upper surface of the FPC board 4 is connected to the signal input end 11, FPC The coil 2 on the lower surface of the plate 4 is connected to the signal output terminal 12 via a second connection end 14; the coating is a cyclic coating. The performance of the speaker is determined by the magnetic force received by the coil 2. Since F (magnetic force) = B (magnetic field strength) × I (current) × L (coil length), B (magnetic field strength) is determined by the magnetic field. Invariably, I (current) is determined by the thick line of the coil. Normally, the thickness of the coil 2 on the FPC board 4 is between 0.8 mm and 1 mm, so the performance of the speaker can be improved only by reducing the thickness of the speaker. Increase the coil length. The present invention increases the length of the coil 2 by forming a coil 2 on the surface of the FPC board 4 by circulating plating; and separately forming two coils 2 on the upper and lower surfaces of the FPC board 4, by being disposed on the FPC board 4 a connecting end 13 upper and lower surfaces The upper coil 2 is connected to each other, and the length of the coil 2 is increased again, thereby improving the performance of the high speaker, and the speaker having the H2.0 thickness has the performance of the H3.5 thick speaker.

The magnetic circuit device shown in FIG. 1, FIG. 3 and FIG. 5 is divided into two upper and lower layers, and the FPC board 4 is placed between the upper and lower magnetic circuit devices, and the magnetic poles of the upper and lower magnetic circuit devices are the same, and the coil 2 is placed. Between the magnetic gaps of the upper and lower magnetic circuit devices. Each layer of magnetic circuit device is composed of a fixing frame 6, a magnetic ring 7 and a magnet 8. The four magnetic rings 7 are spliced and placed in the fixing frame 6, and a magnet 8 is arranged in the middle of each magnetic ring 7, and the magnet 8 is A magnetic gap is formed between the magnetic rings 7, the shape of the magnetic gap is matched with the shape of the coil 2, the magnetic poles of the adjacent two magnets 8 are opposite, and the fixing frame 6 is connected to the positioning bracket 1 by the hanging arm 10. There is only one layer of the magnetic circuit device in the prior art, and only one of the magnetic ring 7 and the magnet 8 is disposed at the upper end of the moving coil 15, and the moving coil 15 surrounds the outer surface of the magnet 8, but due to the design The coil 2 is formed by circulating a plating on the FPC board 4, and the use of the old magnetic circuit device causes the area of the coil 2 to be cut by the magnetic field to be greatly reduced, so that the magnetic force received by the coil 2 is also reduced. Therefore, the present invention places the FPC board 4 between two oppositely disposed magnetic circuit devices such that the coil 2 is located between two opposing magnetic gaps, increasing the area of the coil 2 to cut the magnetic field, thereby increasing the FPC board 4 and the coil. The magnetic force received by 2 increases the sound performance of the speaker. Further, the magnetic circuit device of the present invention is composed of four magnetic rings 7 and four magnets 8. This design improves the performance of the speaker by increasing the area of the coil 2 to cut the magnetic field and lengthening the length of the coil 2. Also, the number of the magnetic ring 7 and the magnet 8 in the present invention is determined by the design size of the speaker, and the more the number of the magnetic ring 7 and the magnet 8, the better the performance of the speaker.

Claims

A flat membrane structure microspeaker, the structure comprising a positioning bracket (1), a magnetic circuit device, a coil (2) and a diaphragm (3), the diaphragm (3) is attached to the upper surface of the coil (2), and the coil ( 2) fixing by the positioning bracket (1); characterized in that the coil (2) is formed by plating on the FPC board (4), the magnetic circuit device is divided into upper and lower layers, and the FPC board (4) is placed in Between the upper and lower magnetic circuit devices, the magnetic poles of the relative positions of the upper and lower magnetic circuit devices are the same, and the coil (2) is placed between the magnetic gaps of the upper and lower magnetic circuit devices, the shape of the coil (2) and the shape of the magnetic gap. Match.
The flat-film structure microspeaker according to claim 1, characterized in that: the positioning bracket (1) is provided with a hanging arm (10) around the positioning bracket (1), and the positioning bracket (1) is respectively separated by the hanging arm (10) Connected to the upper and lower magnetic circuit devices, the positioning bracket (1) is further provided with a signal input end (11), a signal output end (12), a first connecting end (13) and a second connecting end (14).
A flat membrane structure microspeaker according to claim 2, wherein said magnetic circuit means is composed of a fixing frame (6), a magnetic ring (7) and a magnet (8), and a plurality of magnetic rings (7) The horizontal horizontal splicing is placed in the fixing frame (6), and a magnet (8) is arranged in the middle of each magnetic ring (7), and a magnetic gap is formed between the magnet (8) and the magnetic ring (7), and the magnetic gap is formed. The shape matches the shape of the coil (2), the magnetic poles of the adjacent two magnets (8) are opposite, and the fixing frame (6) is connected to the positioning bracket (1) by the hanging arm (10).
A flat-film structure microspeaker according to claim 2, characterized in that the upper and lower surfaces of the FPC board (4) are formed by plating to form a coil (2), and the coils on the upper and lower surfaces of the FPC board (4) ( 2) through the first connection end (13) to achieve phase communication, the coil (2) on the upper surface of the FPC board (4) is connected to the signal input end (11), and the coil (2) on the lower surface of the FPC board (4) passes the second The connection terminal (14) is connected to the signal output terminal (12).
A flat membrane structure microspeaker according to claim 1 or 4, wherein the plating layer is a cyclic plating layer.