| 摘要 |
PURPOSE: To surely and accurately detect a polarity indication of an electronic component such as an electrolytic capacitor mounted on a printed board. CONSTITUTION: A normal polarity indication M is discriminated by tilting a reflecting type optical sensors 3a... and radiating the laser-light E to the side face Hs of an electronic component H from an oblique direction, and at the same time, carrying out detection of at least two or more positions on the side face Hs, e.g. a position Zm where the normal polarity indication M exists and a position Zn which is on the opposite side of and at 180 deg. from this position Zm. |
