Importance

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Abstract

An objective lens employing said far infrared imaging lens set (10), and a fire source detector employing said objective lens, the infrared imaging lens set (10) comprising a first lens (100), a second lens (200), and a third lens (300) successively arranged along a principal axis: the first lens (100) has a first curved surface (102) and a second curved surface (104), the radius of curvature of said first curved surface (102) being 57×(1±5%) mm, and the radius of curvature of said second curved surface (104) being 85×(1±5%) mm; the second lens (200) has a third curved surface (202) and a fourth curved surface (204), the radius of curvature of said third curved surface (202) being 210×(1±5%) mm, and the radius of curvature of said fourth curved surface (204) being 37×(1±5%) mm; and the third lens (300) has a fifth curved surface (302) and a sixth curved surface (304), the radius of curvature of said fifth curved surface (302) being 100×(1±5%) mm, and the radius of curvature of said sixth curved surface (304) being 400×(1±5%) mm; wherein the first curved surface (102), the second curved surface (104), the third curved surface (202), the fourth curved surface (204), the fifth curved surface (302), and the sixth curved surface (304) are successively arranged, and are all convex to the object side.

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First Claim