Lens drive device and electromagnetic drive unit
First Claim
1. A lens drive device comprising:
- a movable portion including a double-pole magnet having two pairs of magnetic poles, a first coil opposing to the double-pole magnet in a perpendicular direction to a light axis, and a lens holder holding the first coil and a lens and being movable to the double-pole magnet in a direction of the light axis;
a fixed portion including a second coil arranged so as to oppose to the double-pole magnet in the direction of the light axis;
a support portion configured to support the movable portion so that the movable portion is movable relatively to the fixed portion in the perpendicular direction to the light axis; and
a nonmagnetic case provided with a through hole where light enters into the lens and attached to the fixed portion so as to cover the movable portion,wherein the double-pole magnet includes a first section having a first magnetization direction and opposing to the first coil and a second section having a second magnetization direction different from the first magnetization direction and opposing to the second coil, andL1/L2 is 1.1 to 2.0, where L1 is a length of the first section in the direction of the light axis, and L2 is a length of the second section in the direction of the light axis.
2 Assignments
0 Petitions
Accused Products
Abstract
A lens drive device includes a movable portion, a fixed portion, and a nonmagnetic case. The movable portion includes a double-pole magnet having two pairs of magnetic poles, a first coil opposing to the double-pole magnet in a perpendicular direction to a light axis, and a lens holder being movable to the double-pole magnet in a direction of the light axis. The fixed portion includes a second coil arranged so as to oppose to the double-pole magnet in the direction of the light axis. The nonmagnetic case is attached to the fixed portion so as to cover the movable portion. The double-pole magnet includes a first section and a second section. L1/L2 is 1.1 to 2.0, where L1 and L2 are respectively a length of the first and second sections in the direction of the light axis.
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Citations
17 Claims
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1. A lens drive device comprising:
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a movable portion including a double-pole magnet having two pairs of magnetic poles, a first coil opposing to the double-pole magnet in a perpendicular direction to a light axis, and a lens holder holding the first coil and a lens and being movable to the double-pole magnet in a direction of the light axis; a fixed portion including a second coil arranged so as to oppose to the double-pole magnet in the direction of the light axis; a support portion configured to support the movable portion so that the movable portion is movable relatively to the fixed portion in the perpendicular direction to the light axis; and a nonmagnetic case provided with a through hole where light enters into the lens and attached to the fixed portion so as to cover the movable portion, wherein the double-pole magnet includes a first section having a first magnetization direction and opposing to the first coil and a second section having a second magnetization direction different from the first magnetization direction and opposing to the second coil, and L1/L2 is 1.1 to 2.0, where L1 is a length of the first section in the direction of the light axis, and L2 is a length of the second section in the direction of the light axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification