Patent ID: 8072420

Claim:
An input device comprising: a sensor configured to detect an input operation performed on an operation surface; a front light mechanism disposed on the sensor and configured to illuminate the operation surface; a mode switching unit configured to select a predetermined operation mode in accordance with the input operation on the operation surface; and a control unit configured to switch an illuminating operation of the front light mechanism under the control of the mode switching unit, wherein the front light mechanism comprises a light source and a light guide member configured to admit and guide light emitted from the light source therein and to output the light toward the operation surface, wherein the light guide member comprises: an illuminating surface disposed on one surface and configured to emit the light therefrom; and an optical region disposed on the other surface opposite the illuminating surface and configured to direct the light toward the illuminating surface, wherein the optical region includes a flat face and a prism face, and one of the flat face and the prism face is shaped like a predetermined mark, and wherein a sheet member is disposed between the light guide member and the sensor, an aperture is disposed in the sheet member at a position opposite to the prism face to form a space at the prism face.