| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical system that can sufficiently correct a variety of aberrations including chromatic aberration, that can be easily fabricated, and that has an excellent resistance to the surrounding environment, and an optical apparatus including the optical system. SOLUTION: When a point at which a light axis and a pupil paraxial chief ray intersect is defined as P, the optical system is configured so that the maximum height of a paraxial marginal ray from the light axis when the paraxial marginal ray passes through a lens surface on an enlargement side relative to the point P is less than that on a reduction side relative to the point P. The optical system includes a first optical element and a second optical element on at least one of the enlargement side and the reduction side relative to the point P. Each of the first optical element and second optical element is composed of a solid material having a refractive light incident surface and a refractive light emergent surface. WhenΔθgF1 andΔθgF2 denote anomalous partial dispersion values of the material of the first and second optical elements for the g-line and F-line, respectively, andϕ1 andϕ2 denote refractive powers of the first and second optical elements, respectively, when the light incident surfaces and the light emergent surfaces of the first and second optical elements are in contact with air, they are each appropriately set. COPYRIGHT: (C)2009,JPO&INPIT
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