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:
Apr. 16, 2019
Filed:
Jul. 12, 2018
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Takaaki Tanaka, Osaka, JP;
Abstract
A light source device has a blue solid-state light source, a red solid-state light source, a first retardation plate, a dichroic mirror, a phosphor plate, a second retardation plate, and a reflector. The first retardation plate causes light from the blue solid-state light source to have a phase difference. The dichroic mirror provides the light from the blue solid-state light source with polarization separation, receiving the light from the blue solid-state light source and light from the red solid-state light source in an identical direction. The phosphor plate emits fluorescence light, excited by one light, separated by the dichroic mirror. The second retardation plate converts, into circular polarization, polarization of the light from the red solid-state light source and other light, separated by the dichroic mirror. The reflector reflects light converted into circular polarization by being passed through the second retardation plate.