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:
Jan. 04, 2011
Filed:
Mar. 23, 2010
Hiroaki Nakayama, Kawasaki, JP;
Hiroaki Nakayama, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An image forming lens has a configuration that an image forming lens IL for receiving parallel beams of light emitted from an observation target object and emerging from an infinity-designed objective lens of a microscope and forming an image of the observation target object in a predetermined position, is constructed of, in order from an object side, a first lens group Ghaving positive refractive power and a second lens group Ghaving negative refractive power, and the first lens group is constructed of a positive lens (e.g., a biconvex lens L) and a negative lens (e.g., a negative meniscus lens L). Glass materials of the positive lens and the negative lens configuring the first lens group Gsatisfy conditions of predetermined νdht and partial dispersion ratio Pht, then a transmittance, with respect to the light having a wavelength of 340 nm, of each of the glass materials of all the lenses is equal to or larger than 50% per glass thickness of 10 mm, and the transmittance with respect to the light having the wavelength of 360 nm is equal to or larger than 80% per glass thickness of 10 mm.