Sensor driving device and camera module including same
A sensor driving device according to an embodiment includes a fixed part; a first moving part disposed inside the fixed part and spaced apart from the fixed part; a second moving part disposed inside the first moving part and spaced apart from the first moving part, and including an image sensor; a first driving part that moves the first moving part relative to the fixed part; and a second driving part that moves the second moving part relative to the first moving part, wherein the first driving part is provided to move the first moving part based on a first driving force corresponding to a first driving method, and the second driving part is provided to move the second moving part based on a second driving force of a second driving method different from the first driving method.
1 . A sensor driving device comprising:
a fixed part;
a lens part disposed on the fixed part;
a first moving part disposed in an inner space of the fixed part and spaced apart from the fixed part;
a second moving part disposed in an inner space of the first moving part and spaced apart from the first moving part, and including an image sensor;
a first driving part that moves the first moving part relative to the fixed part; and
a second driving part that moves the second moving part relative to the first moving part,
wherein the first driving part moves the first and second moving parts in an optical axis direction of the lens part with respect to the fixed part and the lens part in the inner space of the fixed part, and
wherein the second driving part moves the second moving part in a first direction perpendicular to the optical axis direction and a second direction perpendicular to the optical axis direction and the first direction with respect to the fixed part, the lens part and the first moving part in the inner space of the first moving part.
2 . The sensor driving device of claim 1 , wherein the first driving part is provided to move the first moving part based on a first driving force corresponding to a first driving method, and
wherein the second driving part is provided to move the second moving part based on a second driving force of a second driving method different from the first driving method.
3 . The sensor driving device of claim 2 , wherein the first driving part of the first driving method includes a piezoelectric ultrasonic motor, and
wherein the second driving part of the second driving method includes a voice coil motor.
4 . The sensor driving device of claim 1 ,
wherein the lens part includes:
a lens barrel; and
a lens holder coupled to the lens barrel and fixed to the fixed part.
5 . The sensor driving device of claim 4 , wherein the fixed part includes a first frame,
wherein the first moving part includes a second frame disposed inside the first frame,
wherein a first guide member is disposed between the first frame and the lens holder, and
wherein the first guide member includes a guide pin that has one end coupled to the lens holder, an other end coupled to the first frame, and penetrating the second frame in the optical axis direction.
6 . The sensor driving device of claim 5 , wherein the first driving part includes:
an extension bar disposed between the first frame and the second frame;
a piezoelectric element coupled to the extension bar; and
a fixing plate coupled between the extension bar and the second frame,
wherein the second frame is provided to be movable in a third axis direction corresponding to the optical axis by a driving force provided through the first driving part.
7 . The sensor driving device of claim 6 , wherein the first driving part includes:
a first buffering member disposed between the extension bar and the lens holder; and
a second buffering member disposed between the extension bar and the first frame.
8 . The sensor driving device of claim 6 , wherein when the second frame of the first moving part moves in the third axis direction by the first driving part, the second moving part moves along with the second frame in the third axis direction.
9 . The sensor driving device of claim 5 , wherein the second moving part includes:
a sensor substrate on which the image sensor is disposed;
a sensor base disposed on the sensor substrate; and
a filter disposed on the sensor base.
10 . The sensor driving device of claim 9 , further comprising an elastic substrate disposed between the sensor substrate and the second frame,
wherein the elastic substrate includes a conductive pattern part that is electrically connected to the sensor substrate and elastically supports the sensor substrate with respect to the second frame.
11 . The sensor driving device of claim 6 , wherein the second driving part includes:
a magnet part disposed on the sensor base; and
a coil part disposed on the second frame and corresponding to the magnet part, and
wherein the second driving part is provided to move the second moving part relative to the second frame in a direction of a first axis perpendicular to the third axis direction and in a direction of a second axis perpendicular to the third axis direction and the first axis.
12 . The sensor driving device of claim 9 , further comprising a second guide member disposed between the second frame and the sensor substrate.
13 . The sensor driving device of claim 12 , wherein the second frame or the sensor substrate includes a heat dissipation plate, and
wherein the second guide member contacts the heat dissipation plate.
14 . The sensor driving device of claim 13 , wherein the sensor substrate includes a ground pattern, and
wherein at least one of the heat dissipation plate and the second guide member is connected to the ground pattern.
15 . The sensor driving device of claim 5 , further comprising a position detection part disposed between the first frame and the second frame and detecting a relative position of the second frame with respect to the first frame.
16 . The sensor driving device of claim 15 , wherein the position detection part includes a Hall sensor disposed in the first frame and a sensing magnet disposed in the second frame.
17 . The sensor driving device of claim 4 , wherein the first driving part implements AF by moving the first moving part and the second moving part,
wherein the second driving part implements OIS by moving the second moving part, and
wherein a position of the lens part is fixed when implementing the AF and OIS.
18 . A camera module comprising:
a housing;
a lens part disposed within the housing; and
a sensor driving device disposed within the housing, including an image sensor overlapping the lens part in an optical axis direction, and moving relative to the lens part,
wherein the sensor driving device includes:
a fixed part connected to the lens part;
a first moving part disposed in an inner space of the fixed part and spaced apart from the fixed part;
a second moving part disposed in an inner space of the first moving part and spaced apart from the first moving part, and including the image sensor;
a first driving part that moves the first moving part relative to the fixed part; and
a second driving part that moves the second moving part relative to the first moving part,
wherein the first driving part moves the first and second moving parts in an optical direction of the lens part with respect to the fixed part and the lens part in the inner space of the fixed part,
wherein the second driving part moves the second moving part in a first direction perpendicular to the optical axis direction and a second direction perpendicular to the optical axis direction and the first direction with respect to the fixed part, the lens part and the first moving part in the inner space of the first moving part, and
wherein a position of the lens part is fixed when the first and second moving parts move by the first and second driving parts.
19 . The camera module of claim 18 , wherein the first driving part includes a piezoelectric ultrasonic motor, and
wherein the second driving part includes a voice coil motor.