Title:
焦点距離可変光学系
Document Type and Number:
Japanese Patent JP7449700
Kind Code:
B2
Abstract:
A variable focal length optical system includes: an imaging lens configured to condense a parallel beam of light from an objective lens to form an intermediate image; a relay system including, in sequence from an object side, a first relay lens and a second relay lens and configured to relay the intermediate image to infinity; and a lens system of a liquid resonant type which is located between the first relay lens and the second relay lens. A front principal point of the lens system is located to be conjugated with an exit pupil of the objective lens and an expression, 1.90≤fTube/fR1≤2.15, is satisfied. In the expression, fTube denotes a focal length of the imaging lens and fR1 denote a focal length of the first relay lens.
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Inventors:
Koji Kubo
Yuko Shishido
Yuko Shishido
Application Number:
JP2020006663A
Publication Date:
March 14, 2024
Filing Date:
January 20, 2020
Export Citation:
Assignee:
Mitutoyo Corporation
International Classes:
G02B13/00; G02B3/14; G02B21/00; G02B21/02
Domestic Patent References:
| JP8015612A | ||||
| JP2019074722A |
Attorney, Agent or Firm:
Patent Attorney Corporation Kinoshita Intellectual Property Office