Voice coil motor for realizing power saving effect by utilizing magnetic conduction casing

Abstract

The invention discloses a voice coil motor for realizing the power saving effect by utilizing a magnetic conduction casing body. The voice coil motor comprises a magnetic induction component, a lens bearing seat rigidly connected with a magnetic circuit part, a base, a plurality of guide cylinder bodies fixed on the base, an electromagnetic drive mechanism and a casing covering the magnetic induction component, the lens bearing seat, the electromagnetic drive mechanism, and the like. In order to achieve the purpose of saving power, the distance between the casing and the magnetic induction component is set in a preset range, the magnetic induction component generates lateral suction to the casing, then the lens bearing seat is driven to move, thereby causing that the friction increased between the plurality of guide cylinder bodies and the hole wall of a circular hole is greater than the total weight of gravity of the magnetic induction component, the lens bearing seat and a born lens group and / or upward suction of the casing body to the magnetic induction component, and still enabling the lens group to be kept in a fixed position when the group of coil completes positioning and the power is cut off.

Description

technical field [0001] The present invention relates to a voice coil motor, in particular to a voice coil motor which utilizes a magnetically permeable housing to achieve power saving. Background technique [0002] In order to perform precise positioning control on the lens group or the magnetic head arm of the hard disk, a voice coil motor is usually used to move the lens group or the magnetic head arm of the hard disk. The mechanism of the voice coil motor is mainly to place the coil in the magnetic circuit containing the permanent magnet. [0003] In the optical system, when the current passes through the coil, the magnetic field formed by the permanent magnet will generate an interactive propulsion according to the left-hand rule, so that the holder rigidly connected with the permanent magnet is moved, and at the same time drives the lens group fixed on the holder , to achieve the purpose of optical zoom and focus. Since the moving distance of the seat is controlled by...

AI Technical Summary

Problems solved by technology

[0007] However, under the above power-saving design, the lens holder 45 must have a special open arc-shaped bearing surface 51 and a round hole 52, which makes the production of the lens holder 45 more complicated.

When the lens carrier 45 is assembled with the base 43, etc., the guide steel shaft 422 must be relative to the open arc-shaped bearing surface 51, and the guide steel shaft 421 must be relative to the through hole 52, so that the lens carrier 45 has an installation direction. At the same time, the guide steel shafts 422, 421 must pass through the open arc-shaped bearing surface 51 and the round hole 52 to be installed on the base 43 separately, which will easily lead to errors in the assembly of the guide steel shafts 422, 421, and then cause the voice coil Interference problems when the motor is activated

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