Optical system, and image pick-up apparatus using the same
First Claim
Patent Images
1. An optical system comprising:
- a diffractive optical element; and
an optical member for suppressing incidence of ultraviolet radiation on the diffractive optical element, the optical member being disposed on light incident side of the diffractive optical element,wherein a conditional expression, 0.1<
|fu|/f<
2, is satisfied, where fu and f represent focal lengths of the optical member and the entire optical system, respectively.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical system including a diffractive optical element, and an optical member for suppressing incidence of ultraviolet radiation on the diffractive optical element is disclosed. The optical member is disposed on a light incident side of the diffractive optical element. The optical member has optical power to achieve an optical system that has high optical performance and preferable environmental durability.
15 Citations
13 Claims
-
1. An optical system comprising:
-
a diffractive optical element; and an optical member for suppressing incidence of ultraviolet radiation on the diffractive optical element, the optical member being disposed on light incident side of the diffractive optical element, wherein a conditional expression, 0.1<
|fu|/f<
2, is satisfied, where fu and f represent focal lengths of the optical member and the entire optical system, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification