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Title:
【発明の名称】大口径広角レンズ
Document Type and Number:
Japanese Patent JP3076098
Kind Code:
B2
Abstract:
PURPOSE: To constitute a large-aperture wide angle lens of a minimum number of lenses having as small diameters as possible by constituting the lens of a diverging action group, an air gap, an aperture stop, and a converging action group and using an aspherical face to weaken the negative refracting action of the diverging action group and the positive refracting action of the converging action group toward the edge from the optical axis. CONSTITUTION: An aperture stop 11 is arranged in the middle of an air gap 7 between a diverging action group 1 and a converging action group 6. The converging action group 6 on the image surface side is composed of a combined element 5 and a positive lens 4, and the combined element 5 is composed of a positive lens 2 on the object side and a negative lens 3 on the image surface side. The combined element 5 has a positive refracting power and exerts correcting actions upon chromatic aberration and Petzval curvature, and the positive lens 4 exerts actions upon spherical aberration and curvature of field, and one face 9 the lens 4 is aspherical. The negative refracting action of the diverging action group 1 is continuously reduced toward the edge from the optical axis by an aspherical face 8, and the refracting action of the positive lens 4 is continuously reduced toward the edge from the optical axis by an aspherical face 9.

Inventors:
Udo, Schause
Application Number:
JP21821991A
Publication Date:
August 14, 2000
Filing Date:
August 29, 1991
Export Citation:
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Assignee:
Joss, Schneider, Optische, Velke, Gezel Shaft, Mitt, Beschlenktel, Haftung
International Classes:
G02B9/12; G02B13/04; G02B13/06; G02B13/18; (IPC1-7): G02B13/04; G02B13/18
Domestic Patent References:
JP5149734A
JP5121835A
JP5710111A
JP5880611A
JP2208617A
JP3231213A
Attorney, Agent or Firm:
Joji Tashiro



 
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