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. 12, 2001
Filed:
Mar. 14, 2000
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical system for an ocular optical system or a projection optical system, in which a plurality of illuminating light sources of different colors can be placed in a side-by-side relation to each other, and which makes it possible to reduce the overall size and weight of an apparatus such as a head-mounted image display apparatus or a color film projection apparatus. The optical system has an image-forming optical system (,) that projects a real image or virtual image of an object placed in an image plane (,). The image-forming optical system (,) has an entrance pupil (,) at a position on the side of the image plane (,) remote from the image-forming optical system. An exit pupil (,) is located in a conjugate relation to the entrance pupil (,) with respect to the image-forming optical system (,). A chromatic aberration producing device (,) is provided between the entrance pupil (,) and the exit pupil (,). Even if a plurality of illuminating light sources of different colors are placed in a side-by-side relation to each other on the entrance pupil (,), rays from the different light sources can pass the exit pupil; (,), being superimposed on one another, without chromatic aberration.