Catadioptric objective lens
AssigneeKYOCERA SOC Corporation
InventorTakeshi YAMANAKA
Life of this patent
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Abstract
A catadioptric objective lens includes, in order from an infinite conjugate side: a first group composed of at least one refractive optical element; a second group composed of multiple optical elements including two reflective surfaces; and a third group composed of at least one optical element, wherein the catadioptric objective lens has an intermediate image point inside an optical system and satisfies a below conditional expression: f 1 f 3 < 0 where f1 is a focal length of the first group and f3 is a focal length of the third group.
Claims4
A catadioptric objective lens that is infinity-corrected, the catadioptric objective lens comprising, in order from an infinite conjugate side:
- a first group composed of at least one refractive optical element;
- a second group composed of multiple optical elements including two reflective surfaces;
- and
- a third group composed of at least one optical element,
- wherein the catadioptric objective lens has an intermediate image point inside an optical system and satisfies a below conditional expression:
- f
-
- 1
- f
-
- 3
- <
- 0
- where f1 is a focal length of the first group and f3 is a focal length of the third group.
Dependencies are inferred from the claim text.