| 摘要 |
PROBLEM TO BE SOLVED: To keep the compatibility of even easy manufacture under the maintenance of positioning accuracy with the image display element of a relevant device at the time of using an optical prism as the optical element of the device in the field of OA equipment and other various applications. SOLUTION: This prism 1 is formed so that reflected light from an incident plane 2 suitable for the incidence of light from LCD or the like is reflected twice or more inside, and emitted outside as an outgoing beam from the prescribed outgoing plane 4. In this case. recesses 7L and 7R are formed on the sides 6L and 6R made in directions intersecting each direction of the incident plane 2 and the outgoing plane 4, so that an optical path is not obstructed within an effective radius for the incident light to arrive from the incident plane 2 to the outgoing plane 4. |
