Speaker

The present disclosure provides a speaker, which includes a frame having receiving space, a magnetic circuit system and a vibration system received in the receiving space. The vibration system includes a diaphragm and a voice coil, the magnetic circuit system includes a lower plate fixed to the frame, a primary magnet fixed on the lower plate, two secondary magnets disposed on both sides of the primary magnet, and an upper plate disposed on the secondary magnet, the upper plate includes a first surface facing towards the diaphragm, a second surface distal from the diaphragm, a fixing groove recessed from the second surface towards the first surface and a fixing hole. The fixing groove includes a bottom surface distal from the second surface. The fixing hole extends from the bottom surface to the first surface. The frame being injection-molded is filled in the fixing groove and the fixing hole.

FIELD OF THE DISCLOSURE

The present disclosure relates to electro-acoustic transducers, and more particularly to a speaker applied in a portable electronic device.

DESCRIPTION OF RELATED ART

A speaker in the related art includes a frame, a vibration system and a magnetic circuit system. The magnetic circuit system includes a lower plate, a primary magnet, a secondary magnet received in the lower plate and an upper plate disposed on the secondary magnet. The upper plate is fixed to the frame.

In the related art, the upper plate is formed by injection molding with the frame. The upper plate and the frame are connected only by surface bonding.

When the scraps of the upper plate are removed after injection molding, cracks may be produced at the joint of the upper plate and the frame, which affects binding performance between the upper plate and the frame, and a bonding force is weakened. As such, the upper plate may be released and fall off from the frame during vibration, and hence performance of the speaker is affected.

Therefore, it is desired to provide a speaker to overcome the aforesaid problem.

DETAILED DESCRIPTION

Referring toFIG. 1andFIG. 2,FIG. 1is an isometric view of a speaker according to an exemplary embodiment of the present disclosure, andFIG. 2is an exploded view of the speaker as illustrated inFIG. 1. The present disclosure provides a speaker100, which includes a frame1having a receiving space, a vibration system2, a magnetic circuit system3and an upper cover4. The vibration system2, a magnetic circuit system3are accommodated in the receiving space of the frame1. The cover plate4is fixed to the frame1.

The vibration system2includes a diaphragm21configured to vibrate to produce sound, and a voice coil22configured to supply a drive force for the diaphragm21. The speaker100further includes a conductive terminal5configured to connect the voice coil22to an external circuit. The diaphragm21is a two-piece diaphragm, and includes a dome211at a middle position and an edge212surrounding the dome211. In another embodiment, the diaphragm21may also be an integral diaphragm.

The magnetic circuit system3includes a lower plate31fixed to the frame1, a primary magnet32fixed to the lower plate31, a secondary magnet33disposed on each side of the primary magnet32respectively, and an upper plate34disposed on the secondary magnet33. A pole core35is further disposed on the primary magnet32.

Referring toFIG. 3, the upper plate34includes a first surface341facing towards the diaphragm21, a second surface342distal from the diaphragm21, a fixing groove343recessed from the second surface342towards the first surface341, a fixing hole344, a third surface345proximal to the primary magnet32, a fourth surface346distal from the primary magnet32, an avoidance portion347, an extension portion348and a bending portion349. The fixing groove343includes a bottom surface3431. The fixing hole344extends from the bottom surface3431to the first surface341. A material of the frame1is filled in the fixing groove343and the fixing hole344by injection molding. The third surface345and the fourth surface346are parallel to a vibration direction, and the fixing groove343is recessed from the fourth surface towards the third surface.

In this embodiment, an area of an orthographic projection area of the fixing hole344along the vibration direction is less than an area of the bottom surface3431. During the injection molding process, the material of the frame1in the fixing groove343and the fixing hole344is integrally formed with the frame1, and the upper plate34and the frame1are firmly connected to enhance a bonding force between the upper plate34and the frame1. In another embodiment, the area of the orthographic projection of the fixing hole344in the vibration direction may also be equal to the area of the bottom surface3431as long as an effect of holding and fixing is achieved.

Referring toFIG. 4andFIG. 5, the frame1includes a first bottom wall11opposite to the first surface341, a fixing structure12and a first side portion13fixedly connected to the upper plate34. The first bottom wall11extends distally from the diaphragm21to form the fixing structure12fixedly connected to the upper plate34. The fixing structure12includes a first fixing structure121received in the fixing hole344and a second fixing structure122received in the fixing groove343. The first side portion13includes a first inner wall131proximal to the primary magnet32, a first outer wall132distal from the primary magnet32and a side wall133. The first inner wall131and the first outer wall132are both parallel to the vibration direction, and the first bottom wall11connects the first inner wall131to the first outer wall132. The first side wall133extends from the first outer wall132towards the diaphragm21, and is parallel to the vibration direction.

The fixing groove343is excessed from the fourth surface346towards the third surface345. The avoidance portion347is excessed from the fourth surface346towards the third surface345, and is connected to the fixing groove343. The second fixing structure122extends from the first side wall133towards the primary magnet32horizontally along a direction perpendicular to the vibration direction. An end of the second fixing structure122proximal to the primary magnet32is connected to the first fixing structure121, and the second fixing structure122is fixedly caught in the fixing groove343.

At least two fixing grooves343are disposed, and the number of the fixing structures12is consistent with the number of the fixing grooves343, the fixing structure12is disposed correspondingly to the fixing groove343.

In this embodiment, four fixing grooves343are disposed; the extension portion348of the upper plate34extends horizontally from the fourth surface346towards the first outer wall132, and the extension portion348is spaced apart from the first outer wall132. That is, the extension portion348does not extend to the first outer wall132. The extension portion348is disposed between two adjacent avoidance portions347. The first side wall133is provided with a notch1331for configured to receive the extension portion348. During injection molding, the injection scrap of the upper plate34is removed from the extension portion348.

In addition, both ends of the bending portion349bent and extend distally from the diaphragm21, and the bending portion349is fixedly caught in the frame1.

Compared with the related art, in the speaker100according to the present disclosure, fixing grooves and fixing holes are provided on the upper plate, and the frame is provided with a first fixing structure connected with the frame and a second fixing structure extending from the first fixed structure. The first fixing structure is fixed in the fixing hole. The second fixing structure is fixed in the fixing groove. A width of the fixing groove is larger than a width of the fixing hole. With such structure, a bonding area between the upper plate and the frame is increased, and thus, the bonding force therebetween is enhanced.

When the scraps of the upper plate are removed after injection molding, the junction between the upper plate and the frame is not separated by an external force, which effectively improves the firmness and stability of the junction, and thus improves the vibration stability of the speaker.