Patent ID: 9122137
Filing Date: 2015-09-01
Classification: G02B,G03B

Abstract:
1. A housing for a projection display device, the housing comprising: a frame having an opening in which a projection lens is located so as to be shiftable in a first axis direction; a shield shiftable in the first axis direction with respect to the frame, for shielding the opening along with the projection lens; and a regulator for regulating shift of the shield; wherein the shield includes: a first dust-proof wall that is located so as to be in contact with an outer periphery of the projection lens, is shiftable integrally with the projection lens, and has a first width projecting from the outer periphery of the projection lens to a first side in the first axis direction, and a second dust-proof wall that is located between the opening and the first dust-proof wall so as to have a space from the outer periphery of the projection lens, is slidable in the first axis direction within a range regulated by the regulator, and has a second width corresponding to a length of a portion on the first side; wherein when the projection lens is located at a first position and the second dust-proof wall is located at a second position, assuming that the second dust-proof wall has a third width corresponding to a length shiftable from the second position to a second side opposite to the first side with respect to the projection lens, a fourth width corresponding to a length of a portion on the first side in the space between the outer periphery of the projection lens and the second dust-proof wall, and a fifth width corresponding to a length of a portion on the first side in a space between the outer periphery of the projection lens and the frame,