Holding unit, assembly system, sputtering unit, and processing method and processing unit
Because an electromagnetic chuck supplies current to a specific microcoil among a plurality of microcoils and makes an object exert an electromagnetic force working together with a magnet of the object, the object can be held in a state where the object is set at a desired position (a position that corresponds to the microcoil to which current has been supplied) on a base surface. Further, by gas that blows out from a gas supply passage, a levitation force is given to the object, which can reduce effects of a friction force that acts between the object and an upper surface of the electromagnetic chuck when the position of the object is set.
1. A holding unit that holds an object that contains a magnetic substance at least partially, the holding unit comprising:
a base;
a plurality of microcoils arranged in the base that works with the magnetic substance to make the object exert an electromagnetic force;
a control unit that connects to the plurality of microcoils and performs switching between supplying current to each of the microcoils and stopping the supply of current; and
a levitation force mechanism that gives levitation force with respect to the base, to the object, wherein
the levitation force is a force to restrain or prevent a surface force acting on the object when the object is mounted on the base from becoming larger than a volume force,
the control unit is configured to control the levitation force mechanism based on the surface force acting on the object, and
the base includes a wiring board on an upper surface of which the plurality of microcoils are disposed, and an insulation member arranged in a gap between the plurality of microcoils on the wiring board.
2. The holding unit of claim 1 wherein
the levitation force mechanism gives levitation force to the object by using gas.
3. The holding unit of claim 2 wherein
the levitation force mechanism has a gas supply passage, which is formed in the base.
4. The holding unit of claim 1 wherein
the levitation force mechanism gives levitation force to the object by using magnetic force.
5. The holding unit of claim 1 wherein
the microcoil is manufactured using at least a part of a semiconductor process that manufactures a fine microcoil.
6. The holding unit of claim 1 wherein
the base has a portion made of silicon.
7. The holding unit of claim 1 , further comprising:
a movement unit that moves the base.
8. The holding unit of claim 1 , wherein
the base has a coil holding board that includes the wiring board and the insulation member and that has an upper surface serving as an upper surface of the base.