| 摘要 |
PURPOSE: A chart projector is provided to easily control a joined state of a body unit with respect to a base unit. CONSTITUTION: A chart projector comprises a body unit(100), a pattern unit, a light source unit, a hinge member(110), a base unit(200), and a fixing member(300). The pattern unit includes patterns for measuring eyesight. The light source unit generates lights penetrated through the patterns of the pattern units. An optical system projects a light generated by a light source to a screen after being penetrated through the patterns. The hinge member includes a hinge surface which is formed into a part of a spherical surface. The base unit includes an insertion unit where the hinge surface is inserted rotatably. |
