| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to facilitate assembly and to embody high assem bly accuracy even when a wedge-like prism is introduced as a beam shaping optical system to a head of a small size and thin type by previously adhering an auxiliary member to optical parts, such as the prism, to be objected. SOLUTION: The wedge-like rising prism 4 consists of a structure obtained by bonding the auxiliary member 402 to a prism body 401. The base surface of the wedge-like rising prism 4 is formed flush with the A side of the base surface of the prism body. An optical casing base surface 1401 is provided with an optical head casing hole part 1402 corresponding to the size of the wedge-like rising prism 4 and after the wedge-like rising prism 4 is inserted therein, the vertex P part of the wedge-like rising prism 4 is pressed to the B side of the optical head casing hole part 1402, by which alignment is carried out. Both are thereafter adhered and fixed by adhesive parts 1403 at >=2 points. As a result, the set angle accuracy of the wedge-like rising prism 4 may be improved and the stability in assembly is improved by using the auxiliary member 40. |
