JP2005208674A5 - - Google Patents

Claims (15)

  In a projection display device including a light source, a light uniformizing unit, a relay lens, a prism, an image display element, and a projection lens, the prism has a first side surface, a second side surface, and a third side surface. The relay lens is disposed opposite to the first side surface, the image display element is disposed opposite to the second side surface, and the projection lens is disposed on the third side surface. The light beams emitted from the light source, which face each other, pass through the light uniformizing means and the relay lens, enter the prism from the first side surface, and enter the prism from the second side surface. The emitted light illuminates the image display element, and the light beam reflected by the image display element enters the prism from the second side surface, is totally reflected by the first side surface, and is reflected from the third side surface. The pre Projection display device, characterized in that is emitted to the outside of the arm including at least a light flux incident on the projection lens. The projection display device according to claim 1, wherein the relay lens is a plano-convex lens and has a cut surface obtained by cutting at least a part of a circumference. A relay lens that uses a light beam emitted from a light source as a light beam for illuminating the image display element, and a projection lens that guides the light beam emitted from the relay lens to the image display element and reflects the light beam reflected by the image display element. In the projection display device including a prism that totally reflects toward the screen, only one prism is provided in the optical path between the relay lens and the image display element, and the relay lens is a plano-convex lens. A projection display device characterized by having a cut surface obtained by cutting at least a part of the circumference and having a flat surface substantially parallel to the total reflection surface of the prism . The prism has a triangular prism shape having a first side surface, a second side surface, and a third side surface, the total reflection surface is formed by the first side surface, and the second side surface is formed by the image display element. The projection display device according to claim 3, wherein the projection display device is disposed so as to face the projection lens, and the third side surface is arranged to face the projection lens. 5. The projection display device according to claim 2, wherein at least two cut surfaces are provided, and each cut surface is provided along at least two sides of the total reflection surface of the prism. The projection display device according to claim 1, wherein the second side surface and the third side surface of the prism form a right angle. The projection display apparatus according to claim 6, wherein the projection lens is substantially parallel to the third side surface. The projection display device according to claim 6, wherein the display device is substantially parallel to the second side surface. The projection display device according to claim 1, wherein an air layer having a minute interval is interposed between the relay lens and the prism. The projection display device according to claim 1, wherein the relay lens is integrated with the prism. The projection display device according to claim 10, wherein the relay lens is bonded to the prism with an adhesive. The projection display device according to claim 11, wherein the adhesive is an adhesive containing glass beads. The projection display device according to claim 10, further comprising a reinforcing plate for connecting the relay lens and the prism. The projection display device according to claim 13, wherein the reinforcing plate is attached to a cut surface of the relay lens and a side surface of the prism . The projection display device according to claim 1, wherein the relay lens is blackened on the edge or snuff surface.