| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical element constituted of plural optical components which are joined with each other superior in environment resistance, an optical system having the same and an optical apparatus.SOLUTION: An optical element 1 includes: a first optical component 11; a second optical component 12 which is joined with the first optical component 11; and a third optical component 13 which is joined with the second optical component 12. The second optical component 12 is joined with at least either of the first and third optical components 11, 13 being interposed by a joint member 14. Defining the Young's modulus of the first to third optical components 11, 13 and the joint member 14 as E1, E2, E3, and Ec respectively, a condition formulae -0.5<Log(E1×E3/E2)<10, and -0.2<Log(Ec/E2)<10 are satisfied.SELECTED DRAWING: Figure 1 |
