Camera module having magentic sesors to detect a moving image sensor and optical instrument

1 . A camera module comprising:

a fixed unit;

a first position sensor to detect a magnetic field of a sensing magnet in connection with performing a lens autofocus (AF) function;

a moving unit configured to perform a sensor-shift optical image stabilization (OIS) function, wherein the moving unit is moved in a first axis direction perpendicular to an optical axis and a second axis direction perpendicular to both the optical axis and the first axis direction and to be rotated about the optical axis along a plane including the first axis direction and the second axis direction in connection with the sensor-shift OIS function, and wherein the moving unit comprises a first board unit disposed so as to be spaced apart from the fixed unit and an image sensor disposed on the first board unit;

a driving unit comprising a magnet disposed in the fixed unit, and a coil disposed in the moving unit to move the moving unit; and

first, second, and third magnetic sensors to detect a magnetic field corresponding to a position of the moving unit when performing the sensor-shift OIS function,

wherein the magnet comprises a first magnet unit, a second magnet unit, and a third magnet unit,

wherein the coil comprises a first coil unit corresponding to the first magnet unit, a second coil unit corresponding to the second coil unit, and a third coil unit corresponding to the third magnet unit,

wherein the first to third coil units are disposed to face, respectively, the first to third magnet units in the optical direction,

wherein the first magnetic sensor detects changes in the magnetic field of the first magnet unit corresponding to a movement of the moving unit in the first axis direction in connection with performing the sensor-shift OIS function,

wherein the second magnetic sensor detects changes in the magnetic field of the second magnet unit corresponding to a movement of the moving unit in the second axis direction in connection with performing the sensor-shift OIS function,

wherein the third magnetic sensor detects changes in the magnetic field of the third magnet unit corresponding to a rotation of the moving unit about the optical axis and around the plane in connection with performing the sensor-shift OIS function, and

wherein each of the first magnetic sensor and the second magnetic sensor is a Hall sensor, and the third magnetic sensor is a tunnel magnetoresistance (TMR) sensor.

2 . The camera module according to claim 1 , wherein a graph of an output of the third magnetic sensor with respect to the rotation amount of the moving unit about the optical axis comprises a linear section.

3 . The camera module according to claim 1 , wherein a graph of an output of the first magnetic sensor with respect to the movement amount of the moving unit in the y-axis direction comprises a linear section, and a graph of an output of the second magnetic sensor with respect to the movement amount of the moving unit in the x-axis direction comprises a linear section.

4 . The camera module according to claim 1 , comprising a memory configured to store a data value about an output of the third sensor corresponding to the rotation amount of the moving unit.

5 . The camera module according to claim 1 ,

wherein the driving unit moves or rotates the moving unit using interaction between the coil and the magnet.

6 . The camera module according to claim 5 , wherein the magnet further comprises a fourth magnet unit, and the coil further comprises a fourth coil unit corresponding to the fourth magnet unit, and wherein the first to fourth coil units are disposed on four corners of the first board unit, and the first to fourth magnet units are disposed to face the first to fourth coil units, respectively.

7 . The camera module according to claim 6 , comprising a controller configured to supply a driving signal to at least one of the first to fourth coil units.

8 . The camera module according to claim 7 ,

wherein two coil units among the first to fourth coil units are connected to each other in series, and

wherein the controller is configured to supply one driving signal to the two coil units connected to each other in series and is configured to supply an independent driving signal to each of another two remaining coil units among the first to fourth coil units.

9 . The camera module according to claim 7 , wherein the controller is configured to supply an independent driving signal to each of the first to fourth coil units.

10 . The camera module according to claim 1 , wherein the first magnet unit has a magnetization direction identical to a magnetization direction of the third magnet unit and perpendicular to a magnetization direction of the second magnet unit.

11 . The camera module according to claim 1 , wherein each of the first to third magnetic sensors comprises two input terminals and two output terminals, and any one of the two input terminals of each of the first to third magnetic sensors is commonly connected.

12 . The camera module according to claim 1 , comprising:

a support board configured to connect the fixed unit to the moving unit,

wherein the fixed unit comprises a second board unit disposed under the first board unit, and

wherein the support board comprises:

a body;

a connection portion interconnecting the body and the first board unit; and

a terminal unit extending from the body toward the second board unit downwardly and comprising a plurality of terminals coupled and conductively connected to the second board unit.

13 . The camera module according to claim 12 , wherein the support board includes a flexible substrate.

14 . The camera module according to claim 1 , wherein the rotation of the moving unit detected by the third sensor is 0.5 degrees to 5 degrees.

15 . An optical instrument comprising the camera module according to claim 1 .

16 . The camera module according to claim 1 ,

wherein the moving unit comprises spacing member disposed on the first board unit,

wherein the first coil unit, the second coil unit, and the third coil unit are disposed on the spacing member,

wherein each of the first to third coil units comprises a central hole,

wherein the spacing member comprises a hole corresponding to the central hole of the each of the first to third coils, and

wherein each of the first to third magnetic sensors is disposed in the hole of the spacing member corresponding to the central hole of the each of the first to third coil units.

17 . The camera module according to claim 16 ,

wherein the spacing member comprises a pair of protrusions corresponding to each of the first to third coil units so that the central hole is coupled to the corresponding pair of protrusions, and

wherein each of the first to third magnetic sensors overlaps a region of the central hole positioned between the corresponding pair of protrusions in a direction parallel to the optical axis.

18 . The camera module according to claim 1 , wherein the first to third coil units are disposed on respective corners of a single surface of the first board unit that faces the moving unit.

19 . A camera module comprising:

a fixed unit;

a first position sensor to detect a magnetic field of a sensing magnet in connection with performing a lens autofocus (AF) function;

a moving unit configured to perform a sensor-shift optical image stabilization (OIS) function, wherein the moving unit is moved in a first axis direction perpendicular to an optical axis and a second axis direction perpendicular to both the optical axis and the first axis direction and to be rotated about the optical axis along a plane including the first axis direction and the second axis direction in connection with the sensor-shift OIS function, and the moving unit being disposed so as to be spaced apart from the fixed unit and comprising an image sensor;

a driving unit comprising a magnet disposed in the fixed unit and a coil disposed in the moving unit to move the moving unit;

a first Hall sensor, a second Hall sensor, and a rotation detection sensor to detect a magnetic field corresponding to a position of the moving unit when performing the sensor-shift OIS function,

wherein the magnet comprises a first magnet unit, a second magnet unit, and a third magnet unit,

wherein the coil comprises a first coil unit corresponding to the first magnet unit, a second coil unit corresponding to the second coil unit, and a third coil unit corresponding to the third magnet unit,

wherein the first to third coil units are disposed to face, respectively, the first to third magnet units in the optical direction,

wherein the first Hall sensor detects changes in the magnetic field of the first magnet unit corresponding to a movement of the moving unit in the first axis direction when performing the sensor-shift OIS function,

wherein the second Hall sensor detects changes in the magnetic field of the second magnet unit corresponding to a movement of the moving unit in the second axis direction when performing the sensor-shift OIS function,

the rotation detection sensor detects changes in the magnetic field of the third magnet unit corresponding to a rotation of the moving unit about the optical axis and around the plane when performing the sensor-shift OIS function, and

wherein the rotation detection sensor is a tunnel magnetoresistance (TMR) sensor.

20 . The camera module according to claim 19 , wherein at least a portion of the rotation detection sensor is overlapped with the third magnet unit in a direction of the optical axis.

21 . The camera module according to claim 19 ,

wherein the moving unit comprises a first board unit disposed so as to be spaced apart from the fixed unit and a spacing member disposed on the first board unit,

wherein each of the first to third coil units comprises a central hole,

wherein the spacing member comprises a pair of protrusions corresponding to each of the first to third coil units so that the central hole is coupled to the corresponding pair of protrusions, and

wherein each of the first Hall sensor, the second Hall sensor, and the rotation detection sensor overlaps a region of the central hole positioned between the corresponding pair of protrusions in a direction parallel to the optical axis.

22 . A camera module comprising:

a fixed unit;

a moving unit, wherein the moving unit comprises a first board unit disposed so as to be spaced apart from the fixed unit and an image sensor disposed on the first board unit;

a support board configured to connect the moving unit to the fixed unit and to allow the moving unit to move in a first axis direction perpendicular to an optical axis, to move in a second axis direction perpendicular to both the optical axis and the first axis direction, and to rotate about the optical axis along a plane including the first axis direction and the second axis direction, wherein the support board comprises an elastic member to elastically support one or more lateral sides of the moving unit, and a body coupled to the first board unit and provided between the one or more lateral sides of the first board unit and the elastic member;

a driving unit comprising a magnet disposed in the fixed unit, and a coil disposed in the moving unit to move the moving unit; and

first, second, and third magnetic sensors to detect a magnetic field corresponding to a position of the moving unit,

wherein the magnet comprises a first magnet unit, a second magnet unit, and a third magnet unit,

wherein the coil comprises a first coil unit corresponding to the first magnet unit, a second coil unit corresponding to the second coil unit, and a third coil unit corresponding to the third magnet unit,

wherein the first to third coil units are disposed to face, respectively, the first to third magnet units in the optical direction,

wherein the first magnetic sensor detects changes in the magnetic field of the first magnet unit corresponding to a movement of the moving unit in the first axis direction,

wherein the second magnetic sensor detects changes in the magnetic field of the second magnet unit corresponding to a movement of the moving unit in the second axis direction,

wherein the third magnetic sensor detects changes in the magnetic field of the third magnet unit corresponding to a rotation of the moving unit about the optical axis and around the plane, and

wherein each of the first magnetic sensor and the second magnetic sensor is a Hall sensor, and the third magnetic sensor is a tunnel magnetoresistance (TMR) sensor.