Patent ID: 7477035
Filing Date: 2009-01-13
Classification: G03B

Abstract:
1. A dynamic aperture driving apparatus for controlling the intensity of incident light by rotating a dynamic aperture, said dynamic aperture driving apparatus comprising: rotating means, the upper end of which is connected with said dynamic aperture to rotate from one side to the other side in a predetermined rotating angle; driving means for rotating said rotating means from one side to the other side according to a predetermined electric signal; sensing means for detecting a current location of said rotating means; and driving control means for comparing a target location corresponding to an inputted target location signal with said current location detected by said sensing means and making a location control signal control said driving means such that said rotating means reaches the target location, wherein said driving control means increases a rising time and falling time of the target location signal, according to a speed of said rotating means set up to keep vibrations produced by rotation of said rotating means below a certain level.