Image photographing device
Disclosed herein is an image photographing device capable of being auto-focused while moving a lens barrel in an optical axis direction. The image photographing device includes: a lens barrel having at least one lens; a housing receiving the lens barrel therein so that the lens barrel moves in an optical axis direction; and an impact reducing unit elastically supporting the lens barrel in the case in which the lens barrel deviates from a set movement range, thereby primarily damping the lens barrel before the lens barrel deviates from the movement range to collide with other components positioned at an outer side of the lens barrel.
1. An image photographing device comprising:
a lens barrel having at least one lens;
a housing receiving the lens barrel therein so that the lens barrel moves in an optical axis direction; and
an impact reducing unit elastically supporting the lens barrel when the lens barrel deviates from a set movement range, thereby primarily damping the lens barrel before the lens barrel deviates from the movement range to collide with other components positioned at an outer side of the lens barrel, wherein
the impact reducing unit includes:
an elastic member provided in the lens barrel or the housing, and having elastic force in the optical axial direction of the lens barrel, the elastic member including a fixed part fixed to the lens barrel or the housing, an elastic part extended from the fixed part to provide the elastic force of the elastic member, and a catching part extended from the elastic part to thereby be caught to the stopper when the lens barrel deviates from a predetermined movement range; and
a stopper provided at an opposite side of the elastic member in the lens barrel or the housing and allowing at least one side of the catching part of the elastic member to be caught thereon in the case in which the lens barrel deviates from the set movement range, thereby allowing elastic restoration force of the catching part of the elastic member to act in a direction opposite to a movement direction of the lens barrel.
2. The image photographing device according to claim 1 , wherein the elastic part and the catching part is formed in each of both facing sides of the fixed part.
3. The image photographing device according to claim 1 , wherein the stopper includes:
a stop part on which one side of the elastic member is caught when the lens barrel moves to a subject in the optical axis direction, and
a second stop part on which one side of the elastic member is caught when the lens barrel moves in a direction opposite to the subject in the optical axis direction.
4. The image photographing device according to claim 3 , wherein a spaced distance between the first stop part and the second stop part is equal to or more than the set movement range of the lens barrel.
5. The image photographing device according to claim 1 , further comprising an actuator having a driving part for moving the lens barrel in the optical axis direction.
6. The image photographing device according to claim 5 , wherein the driving part of the actuator move the lens barrel in an ultrasonic motor scheme of using a piezo, or a voice coil motor (VCM) scheme of generating electromagnetic force using a coil and a magnet, or a scheme of using a shape memory alloy.
7. The image photographing device according to claim 1 , further comprising a shield case coupled to an outer side of the housing.