| 摘要 |
PURPOSE:To effect positive and rapid discrimination of defective dice in a probing process or a process of classifying defective and non-defective dice, by putting a mark on a dice determined as defective, the mark being of a color complementary to the color reflected from the dice, and by detecting the difference in chroma of these colors. CONSTITUTION:In a proving process or a process of classifying defective and non-defective dice, dice determined as defective are marked with ink of a predetermined color which is complementary or approximately complementary to the color of reflection produced depending on the surface condition of the dice. For example, if reflected light is blue, a ink color will be red or the like. In such a manner, a color factor is introduced into discrimination of defective and non-defective dice to make calssification thereof positive and easy. |
