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:
Dec. 30, 2003
Filed:
Dec. 21, 2001
Hiroyuki Nishida, Hachioji, JP;
Shingo Kashima, Sagamihara, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical filter has a spectral transmittance characteristic plotted as a curve that is not mirror-symmetric with respect to any vertical axis upon wavelength being taken along the axis of abscissa and transmittance being taken along the axis of ordinate. The optical filter can be designed and fabricated easily and efficiently. The optical filter is used with a light source that causes self-absorption, to constitute an illumination optical system. In the illumination optical system, an image of the arc lamp is projected with a sufficiently high magnification in good aberration condition on the pupil of the objective lens, light in a wavelength region that was conventionally unused is efficiently used, and, in addition, the heat problem is solved.