Drive unit provided with position detecting device
First Claim
1. A drive unit comprising:
- a magnetic field generating member for generating a magnetic field;
a magnetic field detecting device including first, second and third magnetic field detecting elements for detecting the magnetic field;
a driving device for moving the magnetic field generating member or the magnetic field detecting device; and
the drive unit executing a relative positioning between the magnetic field generating member and the magnetic field detecting device on the basis of a detection result by the magnetic field detecting device,wherein a first positioning is executed on the basis of the detection result of the first and second magnetic field detecting elements in a predetermined region, and a second positioning is executed on the basis of the detection result of the third magnetic field detecting element at a predetermined point apart from the predetermined region, within a movable range in which the magnetic field generating member or the magnetic field detecting device moves.
1 Assignment
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Accused Products
Abstract
A drive unit in accordance with the present invention is provided with a magnetic field generating member generating a magnetic field, a magnetic field detecting device constituted by first, second and third magnetic field detecting elements detecting the magnetic field, and a piezoelectric actuator moving the magnetic field generating member. When executing a relative positioning between the magnetic field generating member and the magnetic field detecting device on the basis of a detection result by the magnetic field detecting device, a first positioning is executed on the basis of the detection result of the first and second magnetic field detecting elements in a predetermined region, and a second positioning is executed on the basis of the detection result of the third magnetic field detecting element at a predetermined point apart from the predetermined region, within a movable range in which the magnetic field generating member moves. In accordance with the structure, it is possible to position the movable body at a high precision, even in the case that a plurality of position detecting points of the movable body of the drive unit exist at a wide interval.
15 Citations
25 Claims
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1. A drive unit comprising:
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a magnetic field generating member for generating a magnetic field; a magnetic field detecting device including first, second and third magnetic field detecting elements for detecting the magnetic field; a driving device for moving the magnetic field generating member or the magnetic field detecting device; and the drive unit executing a relative positioning between the magnetic field generating member and the magnetic field detecting device on the basis of a detection result by the magnetic field detecting device, wherein a first positioning is executed on the basis of the detection result of the first and second magnetic field detecting elements in a predetermined region, and a second positioning is executed on the basis of the detection result of the third magnetic field detecting element at a predetermined point apart from the predetermined region, within a movable range in which the magnetic field generating member or the magnetic field detecting device moves. - View Dependent Claims (2, 3, 4, 5)
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6. A drive unit comprising:
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first and second magnetic field detecting elements arranged in adjacent to each other; a third magnetic field detecting element arranged at a position apart from the first and second magnetic field detecting elements; and a movable body capable of relatively moving in parallel to an arranged direction of the first and second magnetic field detecting elements, wherein the movable body has a magnetic field generating member positioned so as to come close to the first, second and third magnetic field detecting elements, a first positioning is executed on the basis of a result of an arithmetic operation using an output from the first and second magnetic field detecting elements in the case that the magnetic field generating member comes close to the first and second magnetic field detecting elements, and a second positioning is executed on the basis of only an output from the third magnetic field detecting element in the case that the magnetic field generating member comes close to the third magnetic field detecting element.
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7. A drive unit comprising:
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one magnetic field generating member for generating a magnetic field symmetrically; a plurality of magnetic field detecting elements for detecting the magnetic field and outputting an electric signal in correspondence thereto; and the drive unit executing a relative positioning between the magnetic field generating member and the magnetic field detecting element on the basis of an output from the magnetic field detecting elements, wherein a first positioning is executed on the basis of a result of an arithmetic operation using an output from two adjacent magnetic field detecting elements in a plurality of magnetic field detecting elements, and a second positioning is executed on the basis of a detection result of a point at which an output from one magnetic field detecting element in a plurality of magnetic field detecting elements becomes approximately zero. - View Dependent Claims (8, 9, 10, 11)
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12. A drive unit comprising:
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a position information generator for generating a position information; a position information detector including first, second and third position information detecting elements for detecting the position information; and a driving device for moving the position information generator or the position information detector, wherein the drive unit executes a relative positioning between the position information generator and the position information detector on the basis of a detection result in the position information detector, and wherein a first positioning is executed on the basis of the detection result of the first and second position information detecting elements in a predetermined region, and a second positioning is executed on the basis of the detection result of the third position information detecting element at a predetermined point apart from the predetermined region, within a movable range in which the position information generator or the position information detector moves. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A drive unit comprising:
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first and second position information detecting elements arranged in adjacent to each other; a third position information detecting element arranged at a position apart from the first and second position information detecting elements; and a movable body capable of relatively moving in parallel to an arranged direction of the first and second position information detecting elements, wherein the movable body has a position information generator positioned so as to come close to the first, second and third position information detecting elements, a first positioning is executed on the basis of a result of an arithmetic operation using an output from the first and second position information detecting elements in the case that the position information generator comes close to the first and second position information detecting elements, and a second positioning is executed on the basis of only an output from the third position information detecting element in the case that the position information generator comes close to the third position information detecting element. - View Dependent Claims (23)
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24. A drive unit comprising:
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one position information generator generating a position information; a plurality of position information detecting elements detecting the position information and outputting an electric signal in correspondence thereto; and the drive unit executes a relative positioning between the position information generator and the position information detecting elements on the basis of an output from the position information detecting elements, wherein a first positioning is executed on the basis of a result of an arithmetic operation using an output from two adjacent position information detecting elements in a plurality of position information detecting elements, and a second positioning is executed on the basis of a detection result of a point at which an output from one position information detecting element in a plurality of position information detecting elements becomes approximately zero. - View Dependent Claims (25)
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Specification