US Patent 9664984 Optical unit, projection display apparatus, imaging apparatus

In an optical unit having a reflective picture display device for displaying pictures by projecting light, the picture display device has a first state in which focused light is reflected in an optical axis equivalent direction of an image to be displayed and a second state in which focused light is reflected so as to have a component in a vertical equivalent direction of an image to be projected, a plane including an entire optical axis of light reflected in the second state differs from a plane formed by the optical axis of light incident on the picture display device and the optical axis of light reflected by the picture display device in the first state, and the opening size of the opening of an illumination lens in a horizontal equivalent direction of the image to be projected is larger than in the vertical equivalent direction.