Anti-twist structure of voice coil motor

An anti-twist structure of voice coil motor, comprising:

• a base;
• a lens housing connected to the base, wherein the lens housing has a margin wall with a first protrusion, a second protrusion, and a contact portion, wherein the contact portion is extended outwardly an outer periphery of the first protrusion, and the second protrusion is protruded from the contact portion, wherein the first protrusion and the second protrusion are protruded along an axial direction substantially perpendicular to the margin wall;
• an elastic sheet disposed on a portion of the margin wall and on the contact portion;
• and
• a yoke member having an upper wall and a side wall, wherein the side wall is disposed at one side of the upper wall and the side wall extends outward in a direction not parallel to the upper wall, and wherein the yoke member is connected to the base;
• wherein the lens housing has a deflectable angle relative to a horizontal reference line, and the deflectable angle is an included angle between the lens housing and the horizontal reference line;
• and
• wherein when the lens housing deflects from the horizontal reference line to a maximum value of the deflectable angle, a top surface of the first protrusion abuts against a bottom surface of the upper wall, the second protrusion abuts against the elastic sheet, and the contact portion abuts against the elastic sheet or the bottom surface of the upper wall at the same time, whereby the lens housing and the yoke member interfere with each other.