| 摘要 |
<p>A group of thermal change resistant optical parts has : at least one intermediate optical part (25, 26); and two optical parts (27, 28) which are positioned on the same optical axis as that of said intermediate optical part and are arranged on a light incoming side and a light outgoing side of the intermediate optical part, respectively, wherein the two optical parts (27, 28) are integrated into one by cure of an inorganic adhesive (11), thereby the intermediate optical part is sandwiched by the optical parts (27, 28) of both sides thereof, and is fixed to the optical parts (27, 28) of both sides thereof by friction which is generated in a not-bonded contact faces of the optical parts (27, 28) of both sides. <IMAGE></p> |
