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:
Aug. 20, 2024
Filed:
Nov. 23, 2021
Huvitz Co., Ltd., Anyang-si, KR;
Chang Sung Kim, Anyang-si, KR;
Young Duk Seo, Anyang-si, KR;
HUVITZ CO., LTD., Anyang-si, KR;
Abstract
A chart display device for a visual acuity test includes a chart display optical unit that emits a chart image generated by a chart display optical system to a front, and is rotatably coupled to a frame of the chart display device via a rotation shaft; a position indicator light source that indicates the height of an eye to be examined and emits a position identification light; a position detection sensor that detects the position identification light emitted from the position indicator light source, and thus detects the height of the eye to be examined; and a rotation driving unit that rotates the chart display optical unit around the rotation shaft, and thereby tilts an emission direction of the chart image so that the chart image emitted from the chart display optical unit is emitted in the direction of the eye to be examined.