Patent ID: 8439580

Claim:
A vibrating device comprising: a dust-screening member arranged in front of an image forming unit that holds an image forming element configured to generate an optical image, the dust-screening member being formed into a box shape that includes a plate-shaped polygonal light transmitting part that passes one of light entering from the image forming element and light entering to the image forming element, and a plurality of foot portions that tilt by a predetermined angle and extend from one of all sides of the light transmitting part and portions near all sides in a direction in which the image forming unit is located; a support member configured to support the plurality of foot portions; a vibrating member fixed to at least one of the plurality of foot portions and configured to apply a vibrational amplitude vertical to a surface of the light transmitting part to be vibrated; an elastic member arranged to seal a space between the support member and the plurality of foot portions, wherein the light transmitting part and the plurality of foot portions are formed using the same material, and the dust-screening member is held by an elastic force of the elastic member arranged between the support member and the plurality of foot portions.