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:
Feb. 10, 2004
Filed:
Oct. 11, 2001
Soh Ohzawa, Toyonaka, JP;
Tomiei Kuwa, Osaka, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
A tilt projection optical system, that performs enlarged projection from the primary image plane on the reduction side to the second image plane on the enlargement side without forming an intermediate real image while being located at an angled position, has, sequentially from the primary image plane side: a refractive lens group including an aperture; a bending mirror that rotates the optical axis for the optical system after said bending mirror by approximately 90 degrees; and an optical group including at least one reflective surface that has a negative power; wherein the construction is such that the radius of the circle that encompasses all the light rays involved in the image formation on the second image plane and that is parallel to the surfaces of each lens of the refracting lens group enlarges once and then converges in terms of its radius on the enlargement side from the aperture of the refracting lens group, and wherein a predetermined condition is met.