| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device in which leak of return light to a light source side can be reduced.SOLUTION: An optical device includes: a first light shielding member (4) in which a first passage portion (10) through which light from a light source (2) passes is partly provided and that shields the light by a peripheral portion of the first passage portion; a second light shielding member (6) in which a second passage portion (12) through which the light passing through the first passage portion and traveling in a forward direction passes is partly provided and that shields the light by a peripheral portion of the second passage portion; a light guide portion (5) that is disposed between the first passage portion and the second passage portion, guides the light entering through the first passage portion and traveling in the forward direction to the second passage portion of the second light shielding member, and guides the light entering through the second passage portion and traveling in a reverse direction opposite to the forward direction to the first light shielding member; and a light collection member (3) that collects the light from the light source to be converged on the second passage portion through the first passage portion and the light guide portion. |
