CN101488697B - Flat linear vibrating motor - Google Patents

Abstract

A flat linear oscillation motor comprises an upper cover, a base matched with the upper cover to form a holding space, a coil which contained in the holding space and positioned on the base, an elastic supporting piece connected with the base and a permanent-magnet that is hung in the holding space by the elastic supporting piece; wherein, the base is provided with a plurality of side walls and a bottom wall being vertical to the side walls, the coil is arranged on the bottom wall and positioned in the center under the permanent-magnet, a gap is arranged between the coil and the permanent-magnet, the magnetic pole of the permanent-magnet just faces the coil, and the polarization direction of the magnetic pole of the permanent-magnet facing the coil is opposite, the elastic supporting piece is provided with a fixing part connected with the base, an elastic arm that extends out from and faces the fixing part and has the elastic deformation direction to be parallel to the bottom wall of the base, and a jointing part that extends out from the elastic arm and is connected with the permanent-magnet to lead the permanent-magnet to move along the direction being parallel to the bottom wall.

Description

Flat Linear Vibration Motor

【Technical field】

The invention relates to a vibration motor, in particular to a flat linear vibration motor used in portable consumer electronic products.

【Background technique】

Portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices, or handheld multimedia entertainment equipment, generally use vibration motors for system feedback, such as mobile phone call notifications, game console vibration feedback, etc., which are used There are several types of motors, such as cylindrical iron core motors, hollow cup motors and flat motors.

With the development of consumer electronic products in the direction of thinner and lighter, various internal components also need to adapt to the trend of thinner and lighter. Motors are no exception.

Linear vibration motor refers to the reciprocating motion in which the vibration direction of the vibrator is a straight line. Because of its stable vibration and low noise, it is widely used and installed on consumer electronics products. For the structure of the linear vibration motor, please refer to the Chinese patent application CN200480000815.4 published on November 23, 2005, the US patent No. 6,466,682 published on October 15, 2002, and the US patent No. 7,099,489 published on August 29, 2006 etc.

However, the vibration direction of the vibrator of the above vibration motor is vertical, that is, perpendicular to the installation plane, because it is perpendicular to the installation plane, so it is necessary to provide a large vertical height to facilitate the vibrator to move up and down, so that the height of the entire motor Increase is not conducive to the development of thin.

Therefore, it is necessary to propose a new technical solution to reduce the height of the motor.

【Content of invention】

The technical problem to be solved by the present invention is to provide a flat linear vibration motor with reduced height.

The present invention solves above-mentioned technical problem by such technical scheme:

A flat linear vibration motor, which includes an upper cover, a base that cooperates with the upper cover to form an accommodation space, a coil accommodated in the accommodation space and positioned on the base, an elastic support connected to the base, and an elastic support The permanent magnet is suspended in the accommodation space, the base is provided with a number of side walls and a bottom wall perpendicular to the side walls, the coil is arranged on the bottom wall and located at the center below the permanent magnet, there is a gap between the coil and the permanent magnet, and the permanent The magnetic pole of the magnet is facing the coil, and the polarizing direction of the magnetic pole of the permanent magnet facing the coil is opposite. The elastic support is provided with a fixed part connected to the base, extending from the fixed part and facing the fixed part, and the direction of elastic deformation is parallel to the base The elastic arm of the bottom wall, and the joint extending from the elastic arm and connected to the permanent magnet so that the permanent magnet can move in a direction parallel to the bottom wall.

As an improvement of the present invention, the permanent magnet has an integrated structure.

As an improvement of the present invention, the permanent magnet includes two separate magnets.

As an improvement of the present invention, the permanent magnet is connected to the elastic arm of the elastic support through the counterweight, the counterweight is provided with a main body and a positioning part extending from the main body and connected to the elastic arm, the main body is provided with a through hole, and the permanent magnet That is, it is fixed in the through hole.

As an improvement of the present invention, the material density of the counterweight is not less than 7.8g/cm ³ .

As an improvement of the present invention, the fixing part of the elastic support is provided with a first positioning part positioned on a certain side wall of the base, and a side wall extending from the first positioning part and positioned adjacent to a certain side wall on the second positioning part.

As an improvement of the present invention, the joint part of the elastic support includes a clip extending from the side edge of the elastic arm and away from the fixing part, the clip is an upper clip extending from the two side edges of the elastic arm and opposite to the The lower clip constitutes.

Compared with the prior art, the present invention has the following advantages: because the vibration direction is parallel to the bottom wall, the thickness in the height direction can be greatly reduced.

【Description of drawings】

Fig. 1 is a perspective view of a flat linear vibration motor of the present invention.

Fig. 2 is a three-dimensional exploded view of the flat linear vibration motor of the present invention.

Fig. 3 is a top view of the flat linear vibration motor of the present invention, with the upper cover removed for viewing.

Fig. 4 is a three-dimensional schematic view of the elastic support member of the flat linear vibration motor of the present invention.

Fig. 5 is a sectional view along line A-A in Fig. 3 .

Fig. 6 is a schematic diagram of the principle of the flat linear vibration motor of the present invention.

Fig. 7 is a schematic diagram of another embodiment of the present invention.

【Detailed ways】

The content of the present invention will be described in detail below in conjunction with the accompanying drawings.

The invention is a flat linear vibrating motor, which is mainly used in consumer electronic products such as mobile phones and handheld game machines.

Please refer to FIGS. 1 to 3 , the flat linear vibration motor 10 includes an upper cover 11 , a base 12 assembled with the upper cover 11 to form an accommodation space, an annular coil 13 , several elastic supports 14 , and a counterweight 15 And permanent magnet 16.

The base 12 is provided with a plurality of side walls 121 and a bottom wall 122 vertically connected to the side walls 121. The coil 13 is positioned on the bottom wall 122 and its coil leads (not shown) are welded to the conductive sheet 123 positioned on the bottom wall 122. , in order to obtain alternating current from the outside, the elastic support 14 is positioned on the base 12, preferably on the side wall 121 of the base 12, and the counterweight 15 is suspended in the accommodation space by the elastic supports 14 . The counterweight 15 includes a main body 151 and a plurality of positioning portions 152 extending from the main body 151 , and these positioning portions 152 cooperate with the elastic supporting member 14 to assemble the two. A through hole 153 is defined at the center of the main body 151 , and the through hole 153 is used for positioning the permanent magnet 16 therein. Therefore, the counterweight 15 and the permanent magnet 16 are suspended in the accommodation space by the elastic supporting member 14 .

Please refer to FIG. 4 and FIG. 5 together. The elastic support member 14 includes a fixed portion 141 positioned on the side wall 121 of the base 12, extends from the fixed portion 141 and faces the fixed portion 141, and the elastic deformation direction is toward the fixed portion 141. Or away from the elastic arm 142 of the fixed portion 141 (that is, the X-X direction shown in FIG. 4 ), and the joint portion 144 extending from the elastic arm 142 and cooperating with the positioning portion 152 of the counterweight 15, in fact, the elastic arm 142 The elastic deformation direction is also perpendicular to the side wall 121 of the base 12 . Preferably, the elastic arm 142 is connected to the fixed part 141 through a U-shaped connecting part 143 to increase the elasticity of the elastic arm 142. In fact, the elastic arm 142 can also be bent and extended directly from the end of the fixed part 141, so that The elastic arm 142 and the fixing portion 141 form a V shape. The joining portion 144 and the positioning portion 152 of the counterweight 15 can be assembled together by mechanical methods such as pasting, welding, injection molding, etc. In this embodiment, a method for stably assembling the positioning portion 152 is provided, that is, joining The portion 144 includes a clip extending from the side edge of the elastic arm 142 and away from the fixing portion 141. Preferably, the clip is an upper clip 144a and a lower clip 144b extending from the two side edges of the elastic arm 142 and opposite to each other. The clamping piece 144a and the lower clamping piece 144b are respectively positioned at the upper and lower ends of the positioning part 152, that is, the counterweight 15 is positioned in a clamping manner. In order to make the connection more reliable, glue sticking, welding and other methods can be further used. The coil 13 and the permanent magnet 16 are placed in such a way that the coil 13 is located at the central position below the permanent magnet 16 , and there is a gap between the coil 13 and the permanent magnet 16 in a direction perpendicular to the bottom wall 122 . In order to better fix the elastic support member 14, its fixing part 141 is provided with a first positioning part 141a positioned on a certain side wall of the base 12, and is extended from the first positioning part 141a and positioned adjacent to a certain side wall. The second positioning portion 141b on the side wall of the elastic support member 14 can make the positioning effect of the elastic support member more stable.

Please continue to refer to Fig. 5, in the present embodiment, the permanent magnet 16 positioned in the through hole 153 of counterweight 15 is an integral structure, but adopts two-pole magnetization mode, makes the magnetic pole of its half (label 16a) and the other half (labeled as 16b) has the opposite direction of magnetic pole polarization, and the magnetic pole plane of the permanent magnet 16 is parallel to the bottom wall 122 of the base 12 (also parallel to the coil 13), that is, the N pole or the S pole of the permanent magnet 16 is facing the base The bottom wall 122 of the seat 12 (also facing the coil 13).

，右环的电流防线为垂直于图面向外，图中标示为，图中简单示意出各环位置处的磁力线方向，按照左手定则，左环的受到的磁场力为F 1，方向向右，右环受到的磁场力为F2，方向同样向右，且两者大小相同，因此，整个线圈受到的磁场力的方向为向右，但是，由于线圈13本身被定位在基座上，因此线圈并不能运动，但是由于作用力与反作用力的关系，永磁体16的两半分别受到方向与F1、F2相反大小相同的F1’与F2’作用，而永磁体16与配重块15一同被悬挂在容纳空间内，且弹性支撑件14的弹力臂142(请参图4和图5)的弹性变形方向垂直于基座12的侧壁121，即平行于底壁122，因此，永磁体16与配重块15一同在磁场力的作用下向左运动(图中F1’、F2’的箭头方向)。如果电流方向改变，永磁体16与配重块15一同向右运动，以此形成左右的往复运动，即平行于底壁的振动。Referring to FIG. 6 , the balance weight 15 , the permanent magnet 16 and the coil 13 are taken out for principle explanation. The coil 13 obtains an alternating current from the outside, and the current flows along the winding direction of the coil 13, as shown in the figure, at a certain moment, the direction of the current in the coil 13 is as shown in the figure, and the direction of the current in the left ring is perpendicular to the plane of the figure , marked as

, the current defense line of the right ring is perpendicular to the outside of the figure, and the figure is marked as , the figure simply shows the direction of the magnetic field lines at the positions of each ring. According to the left-hand rule, the magnetic field force received by the left ring is F 1 , and the direction is rightward; the magnetic field force received by the right ring is F2, and the direction is also rightward, and the two Both are the same size, therefore, the direction of the magnetic field force that the whole coil is subjected to is to the right, but because the coil 13 itself is positioned on the base, the coil cannot move, but due to the relationship between the action force and the reaction force, the permanent magnet 16 The two halves of the two halves are respectively subjected to the effects of F1' and F2' which are opposite in direction to F1 and F2 and have the same size, while the permanent magnet 16 and the counterweight 15 are suspended in the accommodation space together, and the elastic arm 142 of the elastic support 14 (please refer to 4 and FIG. 5) the elastic deformation direction is perpendicular to the side wall 121 of the base 12, that is, parallel to the bottom wall 122, therefore, the permanent magnet 16 and the counterweight 15 move to the left under the effect of the magnetic field force (in the figure Arrow direction of F1', F2'). If the direction of the current changes, the permanent magnet 16 and the counterweight 15 move to the right together, thereby forming a left and right reciprocating motion, that is, vibration parallel to the bottom wall.

The function of the counterweight 15 is to increase the vibration force to make the vibration more intense. In fact, there is no counterweight, that is, the permanent magnet 16 is directly connected with the elastic support 14 . In addition, if the counterweight is used, it is preferable to use a material with a density not less than 7.8 g/cm ³ , such as nickel, tungsten and their alloys.

Please refer to FIG. 7 , which is another embodiment of the present invention, that is, two magnets 17, 18 are provided as permanent magnets, and the magnetic pole directions of the two magnets are opposite, which can also produce the same effect as the previous embodiment. They can be assembled together by pasting or other methods, or they can be placed separately by setting two through holes on the weight block, and the effect is the same as above. Therefore, in fact, it does not matter whether it is an integrated permanent magnet or a permanent magnet composed of two magnets, as long as the permanent magnet has opposite magnetic poles on the side facing the bottom wall of the base.

Because the vibration direction is parallel to the bottom wall, the thickness in the height direction can be greatly reduced. In theory, the distance between the upper cover and the permanent magnet or the counterweight can be infinitely small, and the permanent magnet or the counterweight and the coil The distance can also be infinitesimally small. In practical applications, consumer electronic products have relatively strict requirements on thickness, that is, the requirements for thickness should be as small as possible, but the requirements for width are not so obvious compared to thickness.

The above descriptions are only preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, but all equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included within the scope of protection described in the claims.

Claims (7)

1. A flat linear vibrating motor, which comprises a loam cake, a base that cooperates with the loam cake to form an accommodating space, a coil that is accommodated in the accommodating space and positioned on the pedestal, an elastic support member connected to the pedestal, elastically The support hangs the permanent magnet in the accommodation space, the base is provided with a number of side walls and a bottom wall perpendicular to the side walls, the coil is arranged on the bottom wall and located at the center below the permanent magnet, and there is a gap between the coil and the permanent magnet , it is characterized in that: the magnetic pole of the permanent magnet faces the coil, and the polarized direction of the magnetic pole of the permanent magnet facing the coil is opposite, the elastic supporting member is provided with a fixed part connected to the base, extends from the fixed part and faces the fixed part and is elastic The deformation direction is parallel to the elastic arm of the bottom wall of the base, and the joint part is extended from the elastic arm and connected to the permanent magnet so that the permanent magnet can move in a direction parallel to the bottom wall. 2. The flat linear vibration motor according to claim 1, characterized in that: the permanent magnet has an integrated structure. 3. The flat linear vibration motor of claim 1, wherein the permanent magnet comprises two separate magnets. 4. The flat linear vibration motor according to claim 1, 2 or 3, characterized in that: the permanent magnet is connected to the elastic arm of the elastic support through a counterweight, and the counterweight is provided with a main body and is extended from the main body to connect to the elastic force The main body of the positioning part of the arm is provided with a through hole, and the permanent magnet is fixed in the through hole. 5. The flat linear vibration motor according to claim 4, characterized in that the material density of the counterweight is not less than 7.8g/cm ³ . 6. The flat linear vibration motor according to claim 1, characterized in that: the fixed portion of the elastic support is provided with a first positioning portion positioned on a certain side wall of the base and is extended and positioned by the first positioning portion The second positioning portion on the side wall adjacent to the certain side wall. 7. The flat linear vibration motor according to claim 1 or 6, characterized in that: the joint portion of the elastic support includes a clip extending from the side edge of the elastic arm and away from the fixing portion, the clip is formed by the elastic arm It is composed of an upper clip and a lower clip extending from the two side edges and opposite to each other.

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