Optical system, and image pick-up apparatus using the same
First Claim
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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.
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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.
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Citations
13 Claims
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1. An optical system comprising:
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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)
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Specification