A miniaturized articulated manipulator 20 has a first arm member 31A internally provided with two driving motors 33 and 34, and a second arm member 30B not provided with any devices corresponding to the driving motors 33 and 34 and capable of being miniaturized. A front pivoting means is pivotally connected to the seat frame and the front legs. A support structure is attachable for coupling it to a periphery of the opening whereby the support structure is extended across the opening for supporting the part of the electronic device that is accessible through the opening. When the buffer provides a predetermined amount of data to the current overlay scan line, the buffer begins to load the data for the next overlay scan line. The connecting part is provided so as to connect the first tape roll and the second tape roll. The light emitting device comprises a plurality of light emitting units with different wavelengths.