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Title:
MONOCHROMATIC IMAGE OBSERVING OPTICAL SYSTEM AND MONOCHROMATIC FILTER OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JPH11194264
Kind Code:
A
Abstract:

To provide a monochromatic image observing optical system in which dust and dirt stuck to a monochromatic filter are inconspicuous on an image forming plane and a whole size and the size of image are made large compared with a general monochromatic image observing optical system composed of an objective lens and a monochromatic filter.

This system is composed, in order from the object side, of an objective lens 10 composed of a first group 11 and a second group 12, a negative lens group 20, a monochromatic filter 30 and a positive lens group 40. The monochromatic filter 30 is a narrow band interference filter. Both the negative lens group 20 and the positive lens group 40 are constituted by single lenses. The negative lens group 20 has a power for diverging the converged light beam transmitted through the objective lens 10 and making it almost afocal luminous flux and the positive lens group 40 has a power for negating the negative power of the negative lens group 20.


Inventors:
ABE TETSUYA
Application Number:
JP36149397A
Publication Date:
July 21, 1999
Filing Date:
December 26, 1997
Export Citation:
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Assignee:
ASAHI OPTICAL CO LTD
International Classes:
G02B9/14; G02B13/02; G02B23/00; (IPC1-7): G02B13/02; G02B23/00
Attorney, Agent or Firm:
Kanai Hideyuki