US 12,064,182 B2
Chart display device for visual acuity tests
Chang Sung Kim, Anyang-si (KR); and Young Duk Seo, Anyang-si (KR)
Assigned to HUVITZ CO., LTD., Anyang-si (KR)
Filed by HUVITZ CO., LTD., Anyang-si (KR)
Filed on Nov. 23, 2021, as Appl. No. 17/533,298.
Claims priority of application No. 10-2020-0174397 (KR), filed on Dec. 14, 2020.
Prior Publication US 2022/0183548 A1, Jun. 16, 2022
Int. Cl. A61B 3/032 (2006.01); A61B 3/00 (2006.01)
CPC A61B 3/032 (2013.01) [A61B 3/005 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A chart display device for a visual acuity test, comprising:
a chart display optical unit (20) that includes a chart display optical system capable of generating a chart image therein, emits the chart image generated by the chart display optical system to a front, is rotatably coupled to a frame (10) of the chart display device via a rotation shaft (12), and rotates by a predetermined angle in a forward and backward direction around the rotation shaft (12);
a position indicator light source (60) that can be adjusted in height so as to indicate the height of an eye (6) to be examined and emits a position identification light;
a position detection sensor (40) that is mounted on one end of the chart display device so as to face the eye (6) to be examined, detects the position identification light emitted from the position indicator light source (60), and thus detects the height of the eye (6) to be examined; and
a rotation driving unit (50) that rotates the chart display optical unit (20) around the rotation shaft (12) according to the height of the eye (6) to be examined detected by the position detection sensor (40), and thereby tilts an emission direction of the chart image so that the chart image emitted from the chart display optical unit (20) is emitted in the direction of the eye (6) to be examined.