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:
Jul. 04, 2000
Filed:
May. 18, 1999
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A compact, thin and low-cost image-forming optical system having an optical low-pass filter, and an apparatus using the image-forming optical system. The image-forming optical system for forming an image of an object includes a stop (2), a first prism (10) placed closer to the object side than the stop (2), and a second prism (20) placed closer to the image side than the stop (2). The first prism (10) has object-side reflecting surfaces (12, 13) with an aspherical surface configuration that reflect a light beam in the prism and give a power to the light beam when reflecting it. The second prism (20) has image-side reflecting surfaces (22, 23) with an aspherical surface configuration that reflect a light beam in the prism and give a power to the light beam when reflecting it. A low-pass filter (4) for cutting off a high-frequency component is provided between the object-side reflecting surfaces (12, 13) and the image-side reflecting surfaces (22, 23).