Title:
MICROSCOPE OBJECTIVE LENS
Document Type and Number:
Japanese Patent JP3242451
Kind Code:
B2
Abstract:
PURPOSE: To obtain a microscope objective lens which is bright and low in cost and has various aberrations excellently compensated by using a radial type gradient index lens which has a specific refractive index distribution radially from an optical axis.
CONSTITUTION: This radial type gradient index lens consists of two lenses respectively having a refractive index distribution radially from the optical axis represented as N(r)=N00+N10r2+N20r4+... Here, (r) is the radial distance from the optical axis, N00... is the refractive index on the optical axis, and N10, N20... are coefficients of 2nd order, 4th order.... The material of the radial type gradient index lens has refracting power, so the single lens itself has the degree of freedom of aberration compensation, such as the compensation of the Petzval's sum and chromatic aberration, that a homogeneous lens does not have. This lens consists of the 1st and 2nd lenses having positive refracting powers respectively and the refracting powers &phiv 1 and &phiv 2 of the 1st and 2nd lenses are preferably in relation &phiv 1/&phiv 2>1 so as to obtain a lens with ≥0.2 NA.
Inventors:
Toshiyuki Nagaoka
Application Number:
JP18575492A
Publication Date:
December 25, 2001
Filing Date:
June 22, 1992
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
G02B9/00; G02B3/00; G02B21/02; (IPC1-7): G02B21/02
Domestic Patent References:
| JP659190A | ||||
| JP60221716A | ||||
| JP615222A | ||||
| JP442109A | ||||
| JP60220305A | ||||
| JP60218614A | ||||
| JP442110A | ||||
| JP3189608A | ||||
| JP2124509A |
Attorney, Agent or Firm:
Kanji Mukai