Position detection and control of a movable body including an optical element

An IC chip for detecting positions, in a first direction and a second direction, of a movable body including an optical element and for driving the movable body in the first direction and the second direction, the IC chip comprising:

• a plurality of magnetic sensors which detect magnetic fields according to the positions of the movable body in the first direction and the second direction;
• a processor;
• a first position information setting unit which calculates, using the processor, a first relative position of the movable body with respect to a first drive range in the first direction in accordance with the magnetic fields detected by the plurality of magnetic sensors;
• a second position information setting unit which calculates, using the processor, a second relative position of the movable body with respect to a second drive range in the second direction in accordance with the magnetic fields detected by the plurality of magnetic sensors,
• a first target position adjustment unit which calculates, using the processor, a first target position in the first drive range;
• and
• a second target position adjustment unit which calculates, using the processor, a second target position in the second drive range,
• wherein
• the first position information setting unit and the first target position adjustment unit correct at least one of the first relative position or the first target position based on at least one of the second relative position or the second target position;
• the first direction and the second direction intersect one another;
• the IC chip is a single IC chip in which the plurality of magnetic sensors and the processor are integral thereto;
• the IC chip is arranged on a surface of the movable body or a surface of a fixed portion that faces the surface of the movable body;
• the first position information setting unit includes a first another-axis motion monitor unit,
• the first another-axis motion monitor unit determines, using the processor, whether the movable body is in motion or at rest in a direction other than the first direction, and
• the first position information setting unit decides, using the processor, whether the first relative position or the first target position is to be corrected based on determination of the first another-axis motion monitor unit.

An IC chip for detecting positions, in a first direction and a second direction, of a movable body including an optical element and for driving the movable body in the first direction and the second direction, the IC chip comprising:

• a plurality of magnetic sensors which detect magnetic fields according to the positions of the movable body in the first direction and the second direction;
• a processor;
• a first position information setting unit which calculates, using the processor, a first relative position of the movable body with respect to a first drive range in the first direction in accordance with the magnetic fields detected by the plurality of magnetic sensors;
• a second position information setting unit which calculates, using the processor, a second relative position of the movable body with respect to a second drive range in the second direction in accordance with the magnetic fields detected by the plurality of magnetic sensors,
• a first target position adjustment unit which calculates, using the processor, a first target position in the first drive range;
• and
• a second target position adjustment unit which calculates, using the processor, a second target position in the second drive range,
• wherein
• the first position information setting unit and the first target position adjustment unit correct at least one of the first relative position or the first target position based on at least one of the second relative position or the second target position;
• the first direction and the second direction intersect one another;
• the IC chip is a single IC chip in which the plurality of magnetic sensors and the processor are integral thereto;
• the IC chip is arranged on a surface of the movable body or a surface of a fixed portion that faces the surface of the movable body;
• and
• the first position information setting unit further includes:
• a register memory;
• a first upper limit end point information unit and a first lower limit end point information unit which, using the processor, decide an upper limit and a lower limit of the first drive range;
• and
• a first upper limit end point information arithmetic operation unit and a first lower limit end point information arithmetic operation unit which uses the processor to arithmetically operate the upper limit and the lower limit of the first drive range by using the second relative position and information that is stored in the register memory unit and which output a result to the first upper limit end point information unit and the first lower limit end point information unit.

An IC chip for detecting positions, in a first direction and a second direction, of a movable body including an optical element and for driving the movable body in the first direction and the second direction, the IC chip comprising:

• a plurality of magnetic sensors which detect magnetic fields according to the positions of the movable body in the first direction and the second direction;
• a processor;
• a first position information setting unit which calculates, using the processor, a first relative position of the movable body with respect to a first drive range in the first direction in accordance with the magnetic fields detected by the plurality of magnetic sensors;
• a second position information setting unit which calculates, using the processor, a second relative position of the movable body with respect to a second drive range in the second direction in accordance with the magnetic fields detected by the plurality of magnetic sensors,
• a first target position adjustment unit which calculates, using the processor, a first target position in the first drive range;
• a second target position adjustment unit which calculates, using the processor, a second target position in the second drive range,
• a first linear correction unit which, using the processor, corrects variations in the magnetic fields detected by the plurality of magnetic sensors in the first drive range and the first relative position or the first target position of the movable body;
• and
• a second linear correction unit which, using the processor, corrects variations in the magnetic fields detected by the plurality of magnetic sensors in the second drive range and the second relative position or the second target position of the movable body, wherein
• the first position information setting unit and the first target position adjustment unit correct at least one of the first relative position or the first target position based on at least one of the second relative position or the second target position;
• the first direction and the second direction intersect one another;
• the IC chip is a single IC chip in which the plurality of magnetic sensors and the processor are integral thereto;
• the IC chip is arranged on a surface of the movable body or a surface of a fixed portion that faces the surface of the movable body;
• and
• the first linear correction unit uses the processor to performs correction based on at least one of the second relative position or the second target position.