Planar motor with linear coil arrays
First Claim
1. A planar electric motor comprising:
- a magnet array having a plurality of magnets with magnetic fields of alternating polarity; and
a coil array positioned adjacent to the magnet array and operable to interact with said magnetic fields to generate an electromagnetic force between the coil array and the magnet array, the coil array comprising a first coil array having a plurality of oval shaped coils extending longitudinally in a first direction, and a second coil array having a plurality of oval shaped coils extending longitudinally in a second direction generally orthogonal to said first direction, wherein said first coil array is stacked on top of the second coil array and each of said first and second coil arrays includes a plurality of stacked layers of said oval shaped coils, and wherein each of said plurality of oval shaped coils has a length to width ratio of at least 2.
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Accused Products
Abstract
A planar electric motor comprising a magnet array having a plurality of magnets with magnetic fields of alternating polarity and a coil array positioned adjacent to the magnet array and operable to interact with the magnetic fields to generate an electromagnetic force between the coil array and the magnet array. The coil array comprises a first linear coil array having a plurality of oval shaped coils extending longitudinally in a first direction, and a second linear coil array having a plurality of oval shaped coils extending longitudinally in a second direction generally orthogonal to the first direction. The motor is for use in moving a stage within an exposure apparatus having an optical system for imaging a pattern formed in a reticle onto an article supported by the stage.
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Citations
27 Claims
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1. A planar electric motor comprising:
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a magnet array having a plurality of magnets with magnetic fields of alternating polarity; and
a coil array positioned adjacent to the magnet array and operable to interact with said magnetic fields to generate an electromagnetic force between the coil array and the magnet array, the coil array comprising a first coil array having a plurality of oval shaped coils extending longitudinally in a first direction, and a second coil array having a plurality of oval shaped coils extending longitudinally in a second direction generally orthogonal to said first direction, wherein said first coil array is stacked on top of the second coil array and each of said first and second coil arrays includes a plurality of stacked layers of said oval shaped coils, and wherein each of said plurality of oval shaped coils has a length to width ratio of at least 2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An exposure apparatus comprising:
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a frame;
an optical system for forming an image on an article, the optical system being mounted on the frame;
a base positioned below the optical system;
a stage positioned adjacent to the base for supporting and positioning the article, the stage being movable relative to the base and the optical system; and
an electric motor operable to move the stage, the motor comprising a magnet array having a plurality of magnets with magnetic fields of alternating polarity, and a coil array positioned adjacent to the magnet array and operable to interact with said magnetic fields to generate an electromagnetic force between the coil array and the magnet array, the coil array comprising a first coil array having a plurality of oval shaped coils extending longitudinally in a first direction, and a second coil array having a plurality of oval shaped coils extending longitudinally in a second direction generally orthogonal to said first direction, one of the coil array and the magnet array being connected to the stage for movement therewith relative to the other of the magnet array and the coil array connected to the base, wherein said first coil array is stacked on top of the second coil array and each of said first and second coil arrays includes a plurality of stacked layers of said oval shaped coils, and wherein each of said plurality of oval shaped coils has a length to width ratio of at least 2. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification