Patent ID: 7099064

Claim:
An electrostatic-type variable diffractive light modulator, comprising: a light transmissive plate to transmit light; a plurality of first reflective plates attached to an upper surface of the light transmissive plate to be arranged in a row, each of the first reflective plates having a first reflective surface on a light transmissive plate contact surface thereof; a plurality of second reflective plates provided above the first reflective plates to be spaced apart from the first reflective plates at a predetermined interval while being arranged in a row, each of the second reflective plates having a second reflective surface to reflect incident light radiating below; and an actuating unit to actuate the second reflective plates using an electrostatic force so that the second reflective plates are moved between a first position wherein the first reflective surfaces and the second reflective surfaces form a plane mirror, and a second position wherein the first and second reflective surfaces diffract the incident light.