OPTICAL PATH CHANGING ACTUATOR HAVING ASYMMETRIC RIGID STRUCTURE AND ITS DRIVING METHOD

摘要

PROBLEM TO BE SOLVED: To simplify circuit constitution and to especially use structure where bending stress is received so as to increase reliability by asymmetrically tilting a plate for adjusting the incident path of incident light and the tilt angle of reflected light. SOLUTION: A video projection source is provided with the actuator 70 for changing the incident path of the light having three kinds of hues emitted from a light source and the tilt angle of the reflected light and projecting it to a screen. The actuator 70 is equipped with a base plate 72 attached to the inside of a cover and a pair of supporting bases 74 vapor-deposited at the upper part of the base plate 72 to be separated at a fixed interval. The actuator 70 is put between the supporting bases 74 and includes a plate 76 made of metallic material having excellent reflectance so as to reflect the incident light by the previously set tilt angle and an asymmetric means whose ends are respectively coupled with the supporting bases 74 and the plate 76 so as to support and fix the plate 76. The asymmetric means is equipped with 1st and 2nd springs 82 and 84 respectively coupled with both sides of the plate 76 and having a different rigid coefficient.