Micro drive motor

Abstract

The invention discloses a miniature driving motor which comprises an upper cover, an upper gasket, an upper spring strip, a carrier, a magnet assembly, a coil assembly, a lower spring assembly, a positioning support and a base. The positioning support comprises a platy body and a plurality of supporting bosses, a through hole is arranged in the center of the platy body, the supporting bosses are protruded from the platy body and are positioned on the same side of the platy body, outer edges of two lower spring strips are in compression joint on the base fixedly by the platy body, and the supporting bosses are jacked on an outer ring of the upper spring strip. The miniature driving motor has the advantages that the distance from the outer ring of the upper spring strip to the outer edge of each lower spring strip can be effectively controlled, and accordingly a linear driving effect is improved.

Description

technical field [0001] The invention belongs to the technical field of micro-motor structure design, and in particular relates to a micro-drive motor. Background technique [0002] Micro camera devices have been widely used in mobile phones and notebook computers, and the micro drive motors (also called lens drive motors) therein are getting smaller and smaller. [0003] A traditional miniature drive motor generally includes an upper cover, an upper gasket, an upper spring sheet, a lens carrier, a magnet assembly, a coil assembly, a lower gasket, a lower spring assembly and a base. The traditional upper cover is made of magnetically permeable material, and includes a top wall and a side wall connected to the top wall, and a light-transmitting hole is arranged in the center of the top wall. The upper spring sheet includes an outer ring, an inner ring and a wire spring connecting the outer ring and the inner ring; the outer ring of the upper spring sheet is glued and fixed on...

AI Technical Summary

Problems solved by technology

[0004] The difficulty brought about by this method is: in order to ensure the consistency of elastic deformation, it is necessary to strictly control the distance between the outer ring of the upper spring leaf and the outer edge of the lower spring leaf, and the distance between the inner ring of the upper spring leaf and the inner edge of the lower spring leaf; Since the inner ring of the upper spring is fixed on the top of the carrier, and the inner edge of the lower spring is fixed on the bottom of the carrier, both are fixed on the same part, so it is only necessary to ensure the processing accuracy of the carrier, that is, the inner ring of the upper spring and the inner ring of the upper spring can be easily controlled. The spacing between the inner edges of the lower shrapnel; however, the outer ring of the upper spring leaf and the outer edge of the lower shrapnel are respectively fixed on different parts, and the thicker part between the two is the magnet assembly, but the magnet assembly itself The processing accuracy is low and the error is large, so it cannot be used to locate the distance between the two; in addition, in traditional products, the outer ring of the upper spring and the upper gasket are fixed on the upper cover, and the installation position is limited by the accuracy and fixing method of the upper cover; The outer edge of the lower shrapnel is crimped and fixed on the base by the lower gasket, and its installation position is limited by the accuracy of the base and the fixing method; finally, the upper cover is glued and fixed on the base, so it is difficult to accurately ensure the distance between the outer ring of the spring leaf and the outer edge of the lower shrapnel That is, it is difficult to ensure that the elastic deformation produced by the upper spring and the lower spring just offsets the gravity produced by the carrier and the lens, thus affecting the linear drive effect

[0005] In addition, in traditional products, each magnet in the magnet assembly is fixed by glueing its outer wall adjacent to the side wall of the upper cover to the side wall of the upper cover. The bonding effect cannot be known through direct observation, so the bonding cannot be guaranteed. As a result, in the drop test, due to the severe impact force, once the bonding strength of the magnet is slightly poor, it will loosen or even fall off from the side wall of the upper cover, resulting in defective products, so its structure also needs improvement. place

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