Multi-purpose micro voice coil motor

Abstract

The invention discloses a multi-purpose micro voice coil motor which comprises a magnetic yoke body, a first spacer, an upper spring piece, a coil, a coil holder, a permanent magnet, a second spacer, a lower spring piece and a base, wherein the magnetic yoke body and the base are arranged in a mutually matched way, so as to form a sealed space which is used for containing the first spacer, the upper spring piece, the coil, the coil holder, the permanent magnet, the second spacer and the lower spring piece, and the magnetic yoke body is integrally formed by using metal materials. The whole product is covered by the magnetic yoke body made of the metal materials, and the base and the magnetic yoke body are mutually matched to seal the motor product in the magnetic yoke body, so that the strength of the motor is increased; another shell is not additionally adopted to cover the motor, so that the inner space of the motor is enlarged, and the sizes of the permanent magnet and the coil are increased, thereby increasing the driving force of the motor and improving the performance of the motor; and the magnetic yoke body plays multiple roles in the motor, so that the quantity of parts of the motor is further reduced, and the manufacturing process and the assembly difficulty are reduced.

Description

technical field [0001] The invention relates to the technical field of voice coil motors, in particular to a multipurpose miniature voice coil motor used for automatic focusing of a camera. Background technique [0002] The voice coil motor is a miniature displacement drive motor, which has the characteristics of small rotor stroke displacement, small product size, fast response speed, low cost, low power consumption, and accurate stroke displacement. Because voice coil motors have the above-mentioned characteristics, micro-optical devices such as cameras in mobile phones, cameras in notebook computers, and cameras in tablet computers recently use voice coil motors as actuators to drive the lens in the camera along the optical axis. Direction movement, so as to achieve automatic focus. [0003] The voice coil motor uses the left-hand rule of Ampere's law: that is, the energized coil will experience a force perpendicular to the direction of the magnetic field and the directi...

AI Technical Summary

Problems solved by technology

[0005] 1. The connecting elastic unit (that is, the spring wire) in the first elastic member and the second elastic member only adopts a simple circuitous structure, so that during the movement of the motor, the elastic wire structure can only generate a small centripetal tension, so that The angle formed between the dynamic and static state of the axis of the rotor wire frame is relatively large, generally reaching more than 13 minutes (more than 0.21°) at the offset angle, which further affects the focusing effect and leads to poor photo quality of high-pixel mobile phones;

[0006] 2. The shell made of plastic is connected to the top of the yoke, and covers the upper end of the yoke, and the lower end of the yoke is connected to the substrate. Since the top of the yoke is covered by a plastic shell, the motor shell cannot shield the vicinity The interference of electromagnetic waves generated by various components will affect the accuracy of motor operation. At the same time, because the shell is made of plastic, it is not strong enough in terms of shock and vibration resistance;

[0007] 3. Add a metal cover box outside the yoke to cover the Hull shell of the yoke and connect it to the base plate, which not only increases the cost of the motor, but also complicates assembly and processing. Increasing the cover box will inevitably make the internal space of the motor smaller, resulting in a smaller size of the permanent magnet and coil of the motor, thereby reducing the driving force of the motor and affecting the performance of the motor;

[0008] 4. The contact structure between the wire barrel and the substrate is a structure in which the convex part is in contact with the plane, so that dust and other debris inside the motor will enter the photosensitive chip of the camera through the gap between the convex part of the wire barrel and the substrate, affecting shooting quality;

[0009] 5. The pole piece on the first elastic part is connected to the second elastic part by welding. Due to the small size of the pole piece, the difficulty and workload of welding the pole piece are very large, the welding quality cannot be guaranteed, and the welded The strength of the pole piece is often not high, and the service life is relatively low

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