Patent ID: 8827481

Claim:
An illumination device, comprising: a chassis that has an aperture on a light-emitting side; a light source that is stored in the chassis; an optical member that is disposed on the light-emitting side relative to the light source, the optical member covering the aperture of the chassis; a clamping member that is disposed at an edge of the aperture of the chassis, the clamping member having a first part for engaging the optical member from a side thereof facing the light source, and a second part for engaging the optical member from the light-emitting side, the clamping member being deformed in accordance with a deformation of the chassis; and a buffer part disposed in at least one of spaces between the optical member and the first part and between the optical member and the second part, wherein the buffer part has a plurality of mountain-shaped protrusions aligned along a periphery of the edge of the aperture, each of the mountain-shaped protrusions having a rectangular shape in a plan view and a mountain shape in a cross-sectional view and having a top part thereof in contact with the optical member, and wherein the mountain-shaped protrusions are configured such that, in a cross-sectional view, each of the mountain-shaped protrusions is defined by two inclined surfaces, and a first inclination angle formed by the optical member and a first inclined surface of the two inclined surfaces that is inclined toward an edge of the chassis is larger than a second inclination angle formed by the optical member and a second inclined surface of the two inclined surfaces that is inclined toward a center of the chassis.