Title:
【発明の名称】アフォーカル変倍光学系
Document Type and Number:
Japanese Patent JP2958110
Kind Code:
B2
Abstract:
An afocal zooming optical system includes, in order from the object side, an objective optical unit comprising a positive first lens group, an erecting prism component and a negative second lens group, and an eyepiece optical unit comprising a three-element positive third lens group and a single-element positive fourth lens group, which system performs zooming by moving the second and third lens groups in different directions along the optical axis and satisfies certain conditions.
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Inventors:
KATO HIROYUKI
Application Number:
JP33593790A
Publication Date:
October 06, 1999
Filing Date:
November 30, 1990
Export Citation:
Assignee:
ASAHI KOGAKU KOGYO KK
International Classes:
G02B5/02; G02B5/04; G02B9/34; G02B15/14; G02B15/163; G02B15/173; G02B15/20; G02B25/00; G03B13/12; G02B23/14; (IPC1-7): G02B15/163; G02B25/00
Domestic Patent References:
| JP6344617A | ||||
| JP58137815A | ||||
| JP6269219A |
Attorney, Agent or Firm:
Tamio Nishiwaki