| 摘要 |
PURPOSE:To specify an arranged object by providing a light-transmissive reflected plate making an angle theta with a line to connect a sighting point and a two-dimensionally arranged object, and a display device on a straight line which is passing the cross point of the plate/line also making the angle of 180 deg.-2theta with the aforementioned line. CONSTITUTION:The display device 4 is furnished with a display part arranged with k = (B + C)/A which is the ratio of the addition of a distance B from a half mirror 3 to the display device and a distance C from the sighting point to the half mirror 3 to a distance A from the sighting point to a printed-circuit board 1, and pitches x,y of the line/row for electronic parts 2a-2i and the pitches of the line/row for the display parts 4a-4i are connected with alpha = kx, beta = ky. When one of the parts 2b is defective, a brightness or color of the corresponding display part 4b is changed against the other displays. At this time, the part 2b and the display 4b are seen double for a worker at the sighting point O, thereby the defective part 2b can be easily specified. With this constitution, the working procedure is remarkably simplified, the working efficiency is improved and also an erroneous confirmation for positioning is prevented. |
