Title:
PHOTOGRAPHIC LENS
Document Type and Number:
Japanese Patent JP3026241
Kind Code:
B2
Abstract:
PURPOSE: To compensate a large sagittal aberration generated by two surfaces provided across a stop, to widen the interval between a front and a rear group so as to arrange a lens shutter unit, and to prevent a sagittal comatic aberration, generated when deteriorating curvature of field and astigmatism from deteriorating.
CONSTITUTION: A 1st group and a 2nd group are positive meniscus lenses which have concave surfaces on the object sides, a 3rd group is a negative meniscus lens which has a convex surface on the object side, and a 4th group is a negative meniscus lens which has a convex surface on the image side; and a 5th group is a single positive meniscus lens which has a convex surface on the image side and a six group is a positive composed of 7 pieces of cemented lens of a positive and a negative element. negative Thus, the lens consists of the seven elements in the six groups and the power of an air lens formed between the 2nd and 3rd lenses is made negative.
Inventors:
Yoshio Shimazaki
Application Number:
JP35077791A
Publication Date:
March 27, 2000
Filing Date:
December 12, 1991
Export Citation:
Assignee:
Konica Corporation
International Classes:
G02B9/62; (IPC1-7): G02B9/62
Domestic Patent References:
| JP63316815A | ||||
| JP6478208A |
Attorney, Agent or Firm:
Fumio Sato (2 others)