The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 1997
Filed:
Apr. 12, 1995
Toshinobu Suzuki, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The invention provides an immersion microscope objective which has a magnification of about 100.times. and a high numerical aperture of the order of 1.65, and is particularly excellent in axial optical properties. The first lens unit G.sub.1 consists of a cemented doublet of a plano-convex lens and a meniscus lens concave on the object side and a positive meniscus lens concave on the object side, three in all; the second lens unit G.sub.2 consists of a cemented triplet of double-convex, double-concave and double-convex lenses; the third lens unit G.sub.3 consists of a cemented doublet of double-convex and double-concave lenses; the fourth lens unit G.sub.4 consists of a cemented doublet of a double-convex lens and a negative meniscus lens concave on the object side; the fifth lens unit G.sub.5 consists of a cemented doublet of double-convex and double-concave lenses; and the sixth lens unit G.sub.6 consists of a cemented doublet of double-concave and double-convex lenses. The lens located on the side proximate to the object has a refractive index of at least 1.6.