| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing mechanism for fixing a lens 33 to a lens fixing surface 41a formed in a member 41 to be fixed, with an adhesive 39, configured to prevent variability of optical performance to be caused by thermal deformation of the lens 33, while improving positioning accuracy of the lens 33.SOLUTION: A plurality of holes 42 are formed on the lens fixing surface 41a. Shaft members 43 are inserted through the holes 42 so that each of the shaft members 43 has a projection 43a protruding from the lens fixing surface 41a. The lens 33 is arranged in contact with an end on the projection side of the shaft member 43. An adhesive 39 is interposed between the lens 33 and the lens fixing surface 41a so as to cover at least peripheral surfaces of the projections 43a of the shaft members 43. |
