发明授权
- 专利标题: Wide angle photographic lens
- 专利标题(中): 广角摄影镜头
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申请号: US941171申请日: 1978-09-11
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公开(公告)号: US4257678A公开(公告)日: 1981-03-24
- 发明人: Kikuo Momiyama , Hideo Yokota
- 申请人: Kikuo Momiyama , Hideo Yokota
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX52-110940 19770914
- 主分类号: G02B9/60
- IPC分类号: G02B9/60 ; G02B13/04
摘要:
An inverted-telephoto lens, particularly of a small size, is disclosed. A negative meniscus lens having a convex surface faces the object. This is followed by a positive lens consisting of a bi-convex lens cemented to a negative lens, a bi-concave lens, a positive meniscus lens having a convex surface directed toward the image and a positive lens having a highly convex lens facing the image. A diaphragm is located between the bi-convex lens and the bi-concave lens. To correct distortion and curvature of field, the negative meniscus lens is highly curved. The spherical aberration, the coma and the halo of the off-axial sagital rays subject to the above correction are corrected by means of the highly positive cemented surface of the positive biconvex cemented lens.
公开/授权文献
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