Title:
ZOOM LENS INCLUDING WIDE ANGLE
Document Type and Number:
Japanese Patent JP3120386
Kind Code:
B2
Abstract:
PURPOSE: To obtain the compact zoom lens that is a high-power-variation zoom lens, which is suitable for-a compact camera and has a X 42.5 high power variation rate including a wide angle in a power variation range, and small in front lens diameter and rear lens diameter while securing the sufficient quantity of marginal light at the wide-angle end, and need not be machined and assembled with high precision.
CONSTITUTION: This zoom lens is a three-group zoom lens which consists of a 1st lens group with negative refracting power, a 2nd lens group with positive refracting power, and a 3rd lens group with negative refracting power in order from an object side and monotoneously decreases the interval between the 1st and 2nd lens groups and the interval between the 2nd and 3rd lens groups for power variation from the wide-angle end to the telephoto end; and an aperture stop is arranged between the 1st and 2nd lens groups and moved together with the 2nd lens group at the time of power variation.
Inventors:
Nobuyoshi Mori
Application Number:
JP10641791A
Publication Date:
December 25, 2000
Filing Date:
April 12, 1991
Export Citation:
Assignee:
Konica Corporation
International Classes:
G02B13/18; G02B15/20; (IPC1-7): G02B15/20; G02B13/18
Domestic Patent References:
| JP263007A | ||||
| JP2238417A | ||||
| JP497112A | ||||
| JP3233422A | ||||
| JP237317A |
Attorney, Agent or Firm:
Fumio Sato (2 others)