| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact optical unit which has a high SN ratio even to a subject with a low reflection factor, provides information, and can be assembled with high precision. SOLUTION: A compact optical unit is provided with a light emitting section 5 for emitting a light, a first optical element 10a having a first reflecting section 11a for reflecting a light which is emitted from the light emitting section 5, a second optical element 12 having a second reflecting section which is disposed to face the first optical element 10a, and a light condensing optical system 16a for condensing a light. The first reflecting section 11a and the second reflecting section are disposed so as to be diagonal to an optical axis of a light which is incident to the first reflecting section 11a and the second reflecting section, a light transmitting section is disposed in the first optical element 10a for transmitting a light which is reflected by the second reflecting section so as to be incident to the light condensing optical system 16a. By disposing the optical element such that a light beam is incident diagonally; therefore, it is possible to propose a compact optical unit having a high SN ratio which can be assembled easily by using a member for supporting the optical unit highly precisely. COPYRIGHT: (C)2004,JPO
|
