| 摘要 |
A planar reflection surface (7) is arranged between a projection lens (6) and a lens focal point (FL1) of the projection lens (6). The lens focal point (FL1) exists as a pseudo lens focal point (FL2) at a symmetric position with respect to the planar reflection surface (7). A horizontal optical axis (Z1-Z1) exists as a vertical pseudo optical axis (Z3-Z3) that intersects at right angles with the horizontal optical axis (Z1-Z1). |
