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:
May. 14, 1996
Filed:
Jul. 18, 1994
Toshinobu Suzuki, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An immersion microscope objective which has a magnification of about 60, an NA of 1.4, and a reduced number of constituent lens elements and yet which is satisfactorily corrected for spherical and axial chromatic aberrations and is also superior in the flatness of the image field. The objective has a 1-st lens unit (G1) having a positive refractive power as a whole and including a cemented lens having a cemented surface which is concave toward the object side, a 2-nd lens unit (G2) having a positive refractive power as a whole, a 3-rd lens unit (G3) including a cemented lens composed of a negative lens, a positive lens, and a negative lens, in order from the object side toward the image side, a 4-th lens unit (G4) of positive refractive power, a 5-th lens unit (G5) having a convex surface directed toward the object side at a position closest to the object side, and a concave surface directed toward the image side at a position closest to the image side, and a 6-th lens unit (G6) having a concave surface directed toward the object side at a position closest to the object side, and a convex surface directed toward the image side at a position closest to the image side.