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. 13, 2022
Filed:
Aug. 11, 2020
Fujitsu Frontech Limited, Inagi, JP;
Isao Iwaguchi, Inagi, JP;
Yuki Hasegawa, Inagi, JP;
FUJITSU FRONTECH LIMITED, Tokyo, JP;
Abstract
An illumination optical system includes a plurality of light sources arranged in an annular shape, and a prism plate that is formed in an annular shape about an optical axis of illumination light from the light sources. The prism plate includes a prism surface, upon which the illumination light falls incident and on which prism a plurality of prisms arranged in an annular shape along a circumferential direction of the prism plate, are formed, a flat section upon which the illumination light falls incident and which is formed in an annular shape along the circumferential direction of the prism plate, and an emission plane that emits the illumination light. The prism surface is formed on an outer peripheral side outward from a radius of the prism plate that is centered on the optical axis, and the flat section is formed on an inner peripheral side inward from the radius.