Micro-electro mechanical device, micro-electro mechanical device array, light modulation device, micro-electro mechanical light modulation device, micro-electro mechanical light modulation device array and image forming apparatus using the same

A micro-electro mechanical device comprising:

• a movable portion;
• an elastic supporting portion that supports the movable portion so that the movable portion is elastically deformable;
• a plurality of driving portions that apply physical action forces in different directions to the movable portions, so as to rotationally displace the movable portion in first and second directions, wherein:
• a transition time is a time from a state where the movable portion has been rotationally displaced in the first direction and stopped to a state where the driving portions apply the physical action forces to the movable portion to rotationally displace the movable portion in the second direction, which is different from the first direction, and the movable portion reaches a final displacement position,
• an elastic force value of the elastic supporting portion and the transition time have such a relationship that when the elastic force value of the elastic supporting portion is equal to a certain value, the transition time takes a local maximum value, and
• the elastic force value of the elastic supporting portion is equal to or less than the certain value at which the transition time takes the local maximum value.