Miniature loudspeaker clip structure
BACKGROUND OF THE INVENTION 
     The present invention pertains to a miniature loudspeaker clip structure used to clip a miniature loudspeaker securely onto a printed circuit board. By means of this structure, the miniature speaker can be securely mounted onto the printed circuit board. Furthermore, this mounting can be strengthened by means of welding without the fear of loosening. 
     DESCRIPTION OF THE PRIOR ART 
     The known way to mount a miniature loudspeaker is to weld prongs to the circumference of the miniature loudspeaker body in order to match holes prearranged on the printed circuit board. Then, those prongs are welded to connect the speaker securely onto the printed circuit board. However, this kind of mounting structure needs to weld prongs and thereby requires excessive time and labor. The holes are prearranged on the printed circuit board making it very difficult to match precisely with the prongs, thereby forming a loose connection so that it is difficult to weld. For example, U.S. Pat. No. 5,168,527 discloses two or three sets of prongs and the frame of the miniature speaker formed together as one unified structure. The prongs have at least one step to connect with the printed circuit board. In order to easily fit the variety of steps of the prongs into the holes on the printed circuit board, the holes slightly larger than the steps to avoid the difficulty of fitting. Therefore, a large clearance is formed between the step and the holes which cause loosening, although the prongs smoothly fit into the printed circuit board. 
     SUMMARY OF THE INVENTION 
     It is the primary object of the present invention to provide a miniature loudspeaker clip structure. This structure comprises a loudspeaker shell body, a copper ring, a vibrating membrane and a fix ring. A circumference wall of the loudspeaker comprises a large step wall and a small step wall. There are three concave sections in the large step wall. A copper ring is put on the surface of the small step wall. Horizontal portions of the inverted L-type clips pass through the concave sections of the loudspeaker shell body. The vertical portions of the inverted L-type clip extend downward along the circumference wall of the loudspeaker shell body. The vibrating membrane is placed on the copper ring and held in place by the fix ring on the small step wall. Therefore, the clips of the copper ring can mount the miniature loudspeaker onto prearranged holes of the printed circuit board securely without the fear of loosening so that the face of loudspeaker makes sound on the back of the printed board. 
     A second object of the present invention is to provide a miniature loudspeaker clip structure in which the clips extend upward along circumference of the loudspeaker shell body and onto the holes of the printed circuit board so that the face of the loudspeaker makes sound on the front of the printed circuit board. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a exploded perspective view of the present invention. 
     FIG. 2 is an exploded perspective view of another embodiment of the present invention. 
     FIG. 3 is a perspective view of the embodiment of FIG. 1. 
     FIG. 4 is a perspective view of the embodiment of FIG. 2. 
     FIG. 5 is a cross-sectional view of the embodiment of FIG. 3. 
     FIG. 6 is a cross-sectional view of the embodiment of FIG. 4. 
     FIG. 7 is a perspective view of the clip of FIG. 3 constructed with one metal stamping around the circumference wall of the loudspeaker shell body in accordance with the present invention. 
     FIG. 8 is a perspective view three-dimensional diagram of the clip of FIG. 4 constructed with one metal stamping around the circumference wall of the loudspeaker shell body in accordance with the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As shown in FIG. 1, the present invention provides a miniature loudspeaker clip structure to clamp the miniature loudspeaker onto a printed circuit board 5 (see FIG. 5). There are two types of clamping, one of which is for the face of a loudspeaker making sound on the back of the printed circuit board 5, as shown in FIG. 5. The other type is for the face of a loudspeaker that makes sound on the front of the printed circuit board 5, as shown in FIG. 6. The present invention comprises a loudspeaker shell body 1, a copper ring 2, a vibrating membrane 3 and a fix ring 4. Whether the face of loudspeaker is on the front or back of the printed circuit board is decided by the direction of the clips 21 of the copper ring 2 and the face of the loudspeaker shell body. The face of the loudspeaker on the back of the printed circuit board 5 will be the example to be described as follows: 
     A loudspeaker shell body 1 is formed as a concave ring and constructed from one metal stamping. The circumference wall of the shell body is formed by stepped walls 11 and 12. Step wall 11 has three concave sections 111. 
     A circular copper ring 2 fits on the step wall 12 of the aforementioned loudspeaker shell body 1. Copper ring 2 has three L-type clips 21 configured such that a horizontal portion of each clip 21 passes through the corresponding concave section 111 of the loudspeaker shell body 1. The vertical portion of each clip 21 extends downward from with the circumference of the loudspeaker shell body 1. The tip of the vertical portion of each clip 21 has a cone-shaped clipper 211. The arrow-shaped clip 21 is divided vertically by a vertical groove 212. The clip 21 is an elastic clipper. There is a flange 213 extending from each of the two side walls of the clip 21. 
     A vibrating membrane 3 is located on the top of the cooper ring 3 held in place by circular fix ring 4. 
     The aforementioned parts are assembled by putting the copper ring 2 and the vibrating membrane 3 into the loudspeaker shell body 1 and then fixing the a fix ring 4 in order to form a loudspeaker, as shown in FIG. 3. By means of the clip 21 of the copper ring 2, the loudspeaker is clamped onto the prearranged holes of the printed circuit board 5. The face of the loudspeaker makes sound on the back of the printed circuit board 5, as shown in FIG. 5. Because the clips 21 are elastic, the clips can clamp tightly with the top and bottom surfaces of the printed circuit board 5. Moreover, the cone-shaped clipper 211 and the flanges 213 on the two side walls clamp the wall of the holes on the printed circuit board 5. Therefore, the clamping will be very tight no matter what the sizes of the holes (within a certain range) through the printed circuit board 5. However, in order to clamp the loudspeaker shell body more securely, welding can be further used. Before the welding, the clips 21 of the present invention clamp securely so that it is very difficult to become loose due to transportation or vibration. 
     In addition, as shown in FIG. 2 and FIG. 4, a loudspeaker facing the front of the printed circuit board can be clamped by another example of the present invention. Loudspeaker shell body 1, vibrating membrane 3 and fix ring 4 of the loudspeaker are the same as in the aforementioned embodiment. However, in this embodiment copper ring 2&#39; has L-shaped clips 21&#39; extending upward along with the circumference of the loudspeaker shell body 1. The tips of the vertical ends of the clips 21&#39; still form cone-shaped clippers 211&#39; and the arrow-shaped surfaces of the clips 21&#39; is divided vertically by vertical grooves 212&#39;. Each clip 21&#39; is an elastic clipper. Therefore, the loudspeaker can be clamped into the hole on the front of the printed circuit board 5, as shown in FIG. 6. 
     According to the present invention, the clips 21(21&#39;) on the copper ring 2(2&#39;) can be constructed around the circumference of the loudspeaker shell body 1 with one metal stamping, as shown in FIG. 7 and FIG. 8. The metal stamping clip 13(131) mounts precisely onto the holes of the printed circuit board 5.