| 摘要 |
PROBLEM TO BE SOLVED: To provide a wide-angle lens that offers enhanced optical performance with a small number of constituent lenses while maintaining ease of manufacturing. ! SOLUTION: A wide-angle lens is provided, having a half view angle greater than 30° and comprising, in order from the object side, a negative lens group having one or two negative lenses, a positive glass lens, and a positive cemented lens comprising a positive resin lens and a negative resin lens cemented together. A bonding interface of the cemented lens is designed to be an aspherical surface having a sag that decreases in amount with a distance from an optical axis toward the periphery thereof relative to a paraxial spherical surface defined by a paraxial curvature radius of the bonding interface. ! COPYRIGHT: (C)2015,JPO&INPIT |
