Rotary type magnetic coupling device
Disclosed herein is a rotary type magnetic coupling device including first and second coils magnetically coupled to each other used for a rotator. Each of the first and second coils is a loop-shaped having an opening surrounding a rotary axis of the rotator. Each of the first and second coils includes first and second wiring parts extending in a peripheral direction of the rotator, a third wiring part bent in the rotary axis direction from one end of the first and second wiring parts, and a fourth wiring part bent in the rotary axis direction from other end of the first and second wiring parts. At least one of the first and second coils is configured such that the third and fourth wiring parts match or overlap each other when viewed in a radial direction substantially orthogonal to the rotary axis.
1. A rotary type magnetic coupling device used for a rotator, the rotary type magnetic coupling device comprising first and second coils magnetically coupled to each other,
wherein each of the first and second coils is a loop-shaped having an opening surrounding a rotary axis of the rotator,
wherein each of the first and second coils includes:
first and second wiring parts extending in a peripheral direction of the rotator;
a third wiring part bent in the rotary axis direction from one end of the first wiring part or one end of the second wiring part; and
a fourth wiring part bent in the rotary axis direction from other end of the first wiring part or other end of the second wiring part, and
wherein at least one of the first and second coils is configured such that the third wiring part and the fourth wiring part match or overlap each other when viewed in a radial direction substantially orthogonal to the rotary axis.
2. The rotary type magnetic coupling device as claimed in claim 1 ,
wherein one of the first and second coils is configured such that the third wiring part and the fourth wiring part match or overlap each other when viewed in the radial direction, and
wherein other one of the first and second coils is configured such that a gap is formed between the third wiring part and the fourth wiring part when viewed in the radial direction.
3. The rotary type magnetic coupling device as claimed in claim 1 , wherein both the first and second coils are configured such that the third wiring part and the fourth wiring part match or overlap each other when viewed in the radial direction.
4. The rotary type magnetic coupling device as claimed in claim 1 , wherein at least one of the first and second coils is a planar spiral-shaped including a loop section of a plurality of turns, and is configured such that a set of the third wiring parts and a set of the forth wiring parts match or overlap each other when viewed in the radial direction.
5. The rotary type magnetic coupling device as claimed in claim 1 , wherein at least one of the first and second coils is a multilayer loop-shaped in which loop-shaped patterns are formed in a layered manner so as to overlap each other in a lamination direction.
6. The rotary type magnetic coupling device as claimed in claim 1 , wherein each of the first and second coils include a conductor pattern formed on a flexible substrate.
7. The rotary type magnetic coupling device as claimed in claim 6 , wherein the flexible substrate is rolled one or more turns such that the third wiring part and the fourth wiring part match or overlap each other when viewed in the radial direction to be formed into a cylindrical shape.
8. The rotary type magnetic coupling device as claimed in claim 1 , further comprising a first magnetic member disposed outside the first and second coils in the radial direction.
9. The rotary type magnetic coupling device as claimed in claim 1 , further comprising a second magnetic member disposed inside the first and second coils in the radial direction.