Title:
RELAY VARIABLE MAGNIFICATION OPTICAL SYSTEM AND MICROSCOPE WITH SAME
Document Type and Number:
WIPO Patent Application WO/2009/031549
Kind Code:
A1
Abstract:
A relay variable magnification optical system is provided with a variable magnification optical
system that receives light from a primary image to carry out the variation in the
magnification of a secondary image, and a rear lens group that receives the light
passing through the variable magnification optical system to form the secondary
image. The variable magnification optical system is comprised of a first lens
group (G1) with positive refracting power, a second lens group (G2) with negative
refracting power, a third lens group (G4) with positive refracting power, and
a fourth lens group (G5) with positive refracting power in that order from the
secondary image side. The relay variable magnification optical system is characterized
in that, when magnification is varied from a higher magnification edge state
to a lower magnification edge state, the fourth lens group (G4) moves to the secondary
image side, a gap between the first lens group (G1) and the second lens group (G2)
increases, positions of the primary and secondary images and those of an entrance
pupil of the relay variable magnification optical system, a pupil of the variable
magnification optical system and an exit pupil of the relay variable magnification
optical system are kept substantially constant, and the pupil of the variable
magnification optical system is in a position closer to a side of the secondary
image than the end surface of the variable magnification optical system
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Inventors:
NAKAYAMA HIROAKI (JP)
Application Number:
PCT/JP2008/065793
Publication Date:
March 12, 2009
Filing Date:
August 27, 2008
Export Citation:
Assignee:
NIKON CORP (JP)
NAKAYAMA HIROAKI (JP)
NAKAYAMA HIROAKI (JP)
International Classes:
G02B15/20; G02B21/00
Foreign References:
| JP2001255464A | 2001-09-21 | |||
| JPH09274137A | 1997-10-21 | |||
| US5959772A | 1999-09-28 |
Other References:
See also references of EP 2184633A4
Attorney, Agent or Firm:
INOUE, Yoshio (1-4 Nihonbashi 3-chom, Chuo-ku Tokyo 27, JP)
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