| 摘要 |
The invention relates to an optical apparatus allowing images in multiple directions to be simultaneously taken with simple construction using a prism optical system yet with high definitions even at wide angles of view. Specifically, the invention provides an optical apparatus using a prism optical system which has three optical surfaces: a first surface having transmission, a second surface having internal reflection plus transmission and a third surface having reflection and is formed of a medium having a refractive index of 1.3 or greater and in which light enters the medium through the first surface, is totally reflected at the second surface, and then reflected at the third surface 13, and finally leaves the medium this time through the second surface. At least two prism optical systems (101, 102) are arranged side by side with respect to an imaging plane of a single imaging device (30) so that images in at least two directions are formed side by side on the imaging plane of the single imaging device (30), and at least one of three surfaces of each of said prism optical systems (101, 102) has a reflecting surface defined by a rotationally asymmetric plane. |
