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:
Jun. 30, 2009
Filed:
Mar. 30, 2005
Tatsuo Ohta, Otsuki, JP;
Takashi Nozaki, Hino, JP;
Tatsuo Ohta, Otsuki, JP;
Takashi Nozaki, Hino, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.