| 摘要 |
PROBLEM TO BE SOLVED: To provide a projector having a compact and easy assembling structure, capable of preventing the generation of stick slip and being easily operated, as a rotation supporting structure of the projector in a data representation device. SOLUTION: An arm supporting ring, a coupling and a frictional block used in the rotation supporting structure of the arm for supporting the projector of the data representation device, have the same shape, and a plurality of grooves are formed on a frictional face with the coupling, of the frictional block at irregular intervals, whereby the rotation supporting structure can be minimized and the generation of frictional noise caused by stick slip can be inhibited. COPYRIGHT: (C)2005,JPO&NCIPI
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