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. 13, 2021
Filed:
Aug. 23, 2017
Riichiro Hibiya, Tokyo, JP;
Riichiro Hibiya, Tokyo, JP;
MITSUMI ELECTRIC CO., LTD., Tokyo, JP;
Abstract
It is an object of the present invention to provide an optical scanning apparatus and a retinal scanning head-mounted display that prevent an overcurrent from being supplied to a light source. An optical scanning apparatus of the present invention includes a light source () configured to emit light; a light source driving unit () configured to supply a driving current to the light source; an optical scanning unit () configured to scan the light emitted from the light source in accordance with an image signal such that the light is projected onto a projection surface; a light amount sensor configured to detect an amount of the light; a current sensor () configured to detect the driving current; a primary stop control unit () configured to stop an operation of the light source driving unit when the amount of the light is equal to or exceeds a predetermined amount of light; and a secondary stop control unit () configured to stop supply of the driving current to the light source when a value of the driving current is equal to or exceeds a predetermined threshold.