| 摘要 |
An imaging optical system comprising, in order from the object side, a first positive meniscus lens having a convex surface on the object side, an aperture stop, a second negative meniscus lens having a convex surface on the image side, and a third positive lens having an object side aspherical surface which has curvature lowered toward a marginal portion of the aspherical surface and an image side surface which has curvature enhanced toward the marginal portion of the aspherical surface. This imaging optical system allows its performance to be degraded due to manufacturing errors and exhibits high performance even when the optical system is configured compact.
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