| 摘要 |
PURPOSE: A portable book opening device of a finger-insertion type is provided to maintain open state of book using a thumb. CONSTITUTION: A portable book opening device of a finger-insertion type comprises a triangular device body(100). The device body has a finger insertion hole(110). A thumb is inserted into the finger insertion hole. The angular point of the device body is inserted into the bookbinding part of the open book. The bottom side(140) of isosceles triangle has a length of 60-80 mm. The thickness of the device body is 5-15 mm. The diameter of the finger insertion hole is 12-25 mm. |
