Driving apparatus

Abstract

A driving apparatus ( 100 ) is provided with: a base part ( 110 ); a driven part ( 130 ) capable of rotating; an elastic part ( 120 ); and an applying part ( 140 ) for applying to the base part microvibration for rotating the driven part around an axis along one direction (Y-axis) such that the driven part rotates while resonating at a resonance frequency determined by the elastic part and the driven part.

1 . A driving apparatus comprising:
 a base part;   a driven part capable of rotating;   an elastic part which connects the base part and the driven part and which has elasticity for rotating the driven part around an axis along one direction; and   an applying part for applying, to the base part, microvibration for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction, at a resonance frequency determined by the elastic part and the driven part.   
     
     
         2 . The driving apparatus according to  claim 1 , wherein the microvibration is non-directional microvibration or anisotropic microvibration as non-directional vibration energy. 
     
     
         3 . The driving apparatus according to  claim 1 , wherein the applying part applies the microvibration which is caused by a force acting along a direction that is different from a direction of the rotation around the axis along the one direction. 
     
     
         4 . The driving apparatus according to  claim 1 , wherein the applying part applies the microvibration which is caused by a force acting along a direction along a surface of the driven part which is in a static condition. 
     
     
         5 . The driving apparatus according to  claim 1 , wherein
 the elastic part has elasticity for rotating the driven part around an axis along another direction which is different from the one direction, and   the applying part applies, to the base part, the microvibration for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction at the resonance frequency determined by the elastic part and the driven part and for rotating the driven part such that the driven part rotates while resonating around the axis along the another direction at a resonance frequency determined by the elastic part and a suspended part including the driven part.   
     
     
         6 . The driving apparatus according to  claim 5 , wherein
 the base part comprises: a first base part; and a second base part at least partially surrounded by the first base part,   the elastic part comprises: (i) a first elastic part which connects the first base part and the second base part and which has elasticity for rotating the second base part around the axis along the another direction; and (ii) a second elastic part which connects the second base part and the driven part and which has the elasticity for rotating the driven part around the axis along the one direction, and   the applying part applies the microvibration for rotating the second base part such that the second base part rotates while resonating around the axis along the another direction at a resonance frequency determined by the first elastic part and a suspended part including the second base part and for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction at a resonance frequency determined by the second elastic part and the driven part.   
     
     
         7 . The driving apparatus according to  claim 6 , wherein the applying part applies, to the first base part, the microvibration for rotating the second base part such that the second base part rotates while resonating around the axis along the another direction at a resonance frequency determined by the first elastic part and the second base part and for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction at the resonance frequency determined by the second elastic part and the driven part. 
     
     
         8 . The driving apparatus according to  claim 1 , wherein
 the driven part is divided into a plurality of driven portions,   the elastic part comprises (i) a third elastic part which connects a first group of driven portions out of the plurality of driven portions and the base part and which has elasticity for rotating the first group of driven portions around an axis along at least one of the one direction and another direction which is different from the one direction and (ii) a fourth elastic part which connects a second group of driven portions, which is different from the first group of driven portions, out of the plurality of driven portions and the base part and which has elasticity for rotating the second group of driven portions around an axis along at least one of the one direction and the another direction, and   the applying part applies the microvibration for rotating the first group of driven portions such that the first group of driven portions rotate while resonating around the axis along at least one of the one direction and the another direction at a resonance frequency determined by the third elastic part and the first group of driven portions and for rotating the second group of driven portions such that the second group of driven portions rotate while resonating around the axis along at least one of the one direction and the another direction at a resonance frequency determined by the fourth elastic part and the second group of driven portions.   
     
     
         9 . The driving apparatus according to  claim 1 , wherein the applying part is a single applying part. 
     
     
         10 . The driving apparatus according to  claim 1 , wherein
 the elastic part has elasticity for rotating the driven part around an axis along another direction which is different from the one direction, and   the applying part applies each of (i) the microvibration for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction at the resonance frequency determined by the elastic part and the driven part and (ii) a driving force for rotating the driven part such that the driven part rotates around the axis along the another direction.   
     
     
         11 . The driving apparatus according to  claim 10 , wherein
 the base part comprises: a first base part; and a second base part surrounded by the first base part,   the elastic part comprises: (i) a first elastic part which connects the first base part and the second base part and which has elasticity for rotating the second base part around the axis along the another direction; and (ii) a second elastic part which connects the second base part and the driven part and which has elasticity for rotating the driven part around the axis along the one direction, and   the applying part applies each of (i) the microvibration for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction at a resonance frequency determined by the second elastic part and the driven part and (ii) a driving force for rotating the second base part such that the second base part rotates around the axis along the another direction.   
     
     
         12 . The driving apparatus according to  claim 11 , wherein the applying part applies, to the second base part, each of (i) the microvibration for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction at the resonance frequency determined by the second elastic part and the driven part and (ii) the driving force for rotating the second base part such that the second base part rotates around the axis along the another direction.