What is claimed is:1. A miniature sound generator, comprising:a vibration system including a first diaphragm, a voice coil supporting and driving the first diaphragm to vibrate, and a second diaphragm arranged at one side of the voice coil far away from the first diaphragm and elastically supporting the voice coil;a fixing system fixed with the second diaphragm, the fixing system including a frame supporting the second diaphragm and a magnetic circuit system arranged in the frame; whereinthe second diaphragm includes an insulating body and a conductive framework formed in the insulating body for electrically connecting with the voice coil and an external circuit;wherein the conductive framework comprises a first support part corresponding to the frame, a second support part corresponding to the voice coil and a conductive path connecting the first support part and the second support part;wherein the insulating body is wrapped in the periphery of the first support part and the second support part for forming a suspension between the first support part and the second support part; and the conductive path is covered by the suspension; andwherein a plurality of openings is formed on the suspension; and in the openings, the internal bonding pads extends from the second support part towards the first support part.2. The miniature sound generator as described in claim 1, wherein the voice coil comprises a voice coil lead, an external bonding pad extending from the first support part towards the outside of the frame and electrically connected with the external circuit, an internal bonding pad formed by the second support part for electrically connecting with the voice coil, the conductive path connects the external bonding pad and the internal bonding pads electrically.3. The miniature sound generator as described in claim 1, wherein the voice coil comprises a pair of long shaft sides and a pair of short shaft sides for forming the voice coil; and the conductive framework is symmetrically arranged along the direction of the long shaft of the voice coil.4. The miniature sound generator as described in claim 3, wherein the external bonding pad comprises a first external bonding pad and a second external bonding pad which are insulated to each other, and the internal bonding pads comprise a first internal bonding pads correspondingly connected with the first external bonding pad and a second internal bonding pads correspondingly connected with the second external bonding pad, further, the first internal bonding pads and the second internal bonding pads are insulated to each other.5. The miniature sound generator as described in claim 1, wherein the magnetic circuit system comprises a magnetic bowl matched with the frame and a magnetic steel disposed on the magnetic bowl; and the magnetic steel comprises a main magnet, a pair of auxiliary magnets symmetrically arranged at two sides of the main magnet and annular magnetic conductive parts surrounding the main magnet and the auxiliary magnets.6. The miniature sound generator as described in claim 1, wherein the conductive framework is made of copper foil.
