Systems and methods for an optical image stabilizer system
View Patent ↗The optical image stabilizer system according to various aspects of the present technology may comprise a set of springs connected to a lens such that the force exerted by the set of springs and the force exerted by gravity are in equilibrium. A position detection sensor may be linked to the lens and detect a current position of the lens. An accelerometer may be communicatively linked to the lens and generate a set of acceleration data corresponding to the acceleration of the lens. A control unit may be coupled to at least one of the lens, position detector sensor, and the accelerometer, and calculate a new target position for the lens. A motor may be coupled to the lens and respond to the target position received from the control unit.
1. An optical image stabilizer for a lens of a camera module, comprising:
a set of springs connected to the lens;
a position detection sensor linked to the lens and configured to detect a current position of the lens;
an accelerometer communicatively linked to the lens and configured to generate a set of acceleration data corresponding to an acceleration of the lens;
a control unit coupled to at least one of the lens, the position detector sensor, and the accelerometer, wherein the control unit is configured to calculate a target position for the lens according to:
a set of measurements for the lens in a first orientation; and
a set of measurements for the lens in a second orientation; and
a motor coupled to the lens and configured to actuate the lens towards the target position.
2. The optical image stabilizer of claim 1 , wherein the motor comprises:
a first actuator communicatively coupled to the control unit, wherein the first actuator is configured to actuate the lens along a first axis; and
a second actuator communicatively coupled to the control unit, wherein the second actuator is configured to actuate the lens along a second axis.
3. The optical image stabilizer of claim 1 , wherein the position detection sensor comprises:
a first sensor configured to determine the position of the lens along a first axis; and
a second sensor configured to determine the position of the lens along a second axis.
4. The optical image stabilizer of claim 1 , wherein the acceleration data comprises an acceleration data along a first axis and an acceleration data along a second axis.
5. The optical image stabilizer of claim 1 , wherein the target position of the lens comprises a position of the lens that requires the least amount of electrical power.
6. The optical image stabilizer of claim 1 , wherein the motor is configured to position the lens into the target position in at least one of a single process and in an iterative process.
7. A computer-implemented method of operating an optical image stabilizer for a lens of a camera module coupled to a gyro sensor system and disposed within a portable device, comprising:
detecting from a position detection sensor linked to the lens:
an initial position of the lens according to a force of gravity on the lens and a force applied by a set of springs connected to the lens; and
a new position of the lens resulting from a movement of the lens;
receiving from an accelerometer coupled to the lens a set of acceleration data corresponding to an acceleration rate of the lens in at least two dimensions;
determining a target position for the lens based on the acceleration data, comprising:
orienting the lens in a first orientation, wherein: a first axis comprises a vertical axis upon which the force of gravity applies;
performing a set of measurements in the first orientation;
orienting the lens in a second orientation, wherein: a second axis comprises the vertical axis upon which the force of gravity applies; and
performing a set of measurements in the second orientation; and
actuating the lens towards the target position.
8. The method of claim 7 , further comprising removing an offset data from the acceleration data, wherein the offset data comprises a first offset data in the first orientation and a second offset data in the second orientation.
9. The method of claim 7 , further comprising calculating a gain data along the first axis and the second axis in both the first orientation and the second orientation.
10. The method of claim 9 , wherein determining the target position further comprises incorporating at least one of the offset data and the gain data.
11. The method of claim 7 , wherein actuating the lens towards the target position comprises a single operation.
12. The method of claim 7 , wherein actuating the lens towards the target position comprises an iterative process, wherein after each repositioning, a new set of calculations is performed to determine a new target position.
13. The method of claim 7 , wherein the target position comprises a position of the lens where the force of gravity and the force of the set of springs are in equilibrium.
14. An optical image stabilizer for a lens of a camera module coupled to a gyro sensor system and disposed within a portable device, comprising:
a set of springs connected to the lens;
a position detection sensor linked to the lens and configured to detect a position data comprising:
an initial position of the lens under a force of gravity and a force applied by the set of springs; and
a new position of the lens resulting from a movement of the portable device;
an accelerometer communicatively linked to the lens and configured to measure a set of acceleration data corresponding to an acceleration rate of the lens;
a control unit coupled to at least one of the lens, the position detector sensor, and the accelerometer, wherein the control unit is configured to:
receive the acceleration data from the accelerometer;
receive the new position data from the position detection sensor; and
calculate a target position, comprising:
orienting the lens in a first orientation, wherein: a first axis comprises a vertical axis upon which the force of gravity applies;
performing a set of measurements in the first orientation;
orienting the lens in a second orientation, wherein: a second axis comprises the vertical axis upon which the force of gravity applies; and
performing a set of measurements in the second orientation; and
a servo motor coupled to the lens and configured to actuate the lens into the target position.
15. The optical image stabilizer of claim 14 , wherein performing a set of measurements in the first and second orientations comprises:
removing an offset data from the acceleration data, wherein the offset data comprises a first offset data in the first orientation and a second offset data in the second orientation; and
calculating a gain data along the first axis and the second axis in both the first orientation and the second orientation.
16. The optical image stabilizer of claim 15 , further comprising calculating a gain data along the first axis and the second axis in both the first orientation and the second orientation.
17. The optical image stabilizer of claim 14 , wherein the target position of the lens comprises a position of the lens that requires the least amount of electrical power.