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EYE CHART PRESENTATION DEVICE AND OPHTHALMOLOGIC APPARATUS
专利权人:
TOPCON CORPORATION
发明人:
Eiichi YANAGI
申请号:
US16816808
公开号:
US20200288967A1
申请日:
2020.03.12
申请国别(地区):
US
年份:
2020
代理人:
摘要:
An eye chart presentation device includes a display to display an eye chart image on a screen, a reflection mirror to reflect light flux emitted from the display, and a convex lens system to form a virtual image of the eye chart image from the light flux reflected by the reflection mirror, the focal length of the convex lens system being greater than 800 mm. The screen is positioned within the focal length of the convex lens system, and the display emits the light flux from a lateral direction with respect to sightline of the eye. The reflection mirror includes a first mirror to directly reflect the light flux from the display and a second mirror to reflect the light flux reflected by the first mirror to the convex lens system.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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