Laser marking manner and resin constituent null for laser marking

摘要

PURPOSE:To mark with clear black color easily by irradiating with laser beam the surface of a matter consisting of a resin composing material containing a resin and a compound containing one kind or more of metal selected from a group consisting of bismuth, nickel and copper. CONSTITUTION:As all or a part of an organic material part in a matter, there is a resin composing material containing a resin and a compound containing one kind or more of metal selected from a group consisting of bismuth, nickel, and copper. The surface of the matter is coated with the resin composing material. Then, a part of the surface of the matter is printed, coated, or made to be multi-layered. Or, the surface of a part desired to be marked is formed by the resin composing material in such a manner that the resin composing material is made to be a tape so as to stick to the surface of the matter and irradiate it with laser beam for a marking. Thus, a black color marking with good sensibility and high visibility will be possible only by the irradiation with the laser beam.