Other

Dai Nippon Printing Co., Ltd.

Masahiro Shimoyamada

Koji Shimizu

Kazuyoshi Hayashi

Atsuya Ozawa

Teruto Isonaga

Norio Endo

A laser-marking laminated structure has at least a base layer ( ), a masking layer ( ) capable of being removed by irradiation with a laser beam, and an OP layer ( ) formed in that order on a support element ( ). The base layer and the masking layer are colored layers having colors distinctly different from each other in lightness. The laser-marking laminated structure is irradiated with a laser beam in a desired pattern including characters to remove portions of the masking layer ( ) and the OP layer ( ) corresponding to the pattern so that the pattern is displayed clearly on the laser-marking laminated structure because of the contrast between the color of the base layer ( ) and that of the masking layer ( ).

Laser-marking laminated structure and laser-marked laminated structure

A laser-marking medium comprises at least a base layer and a masking layer formed on one side of a support element in the stated order. The base layer has laser light absorptivity, and the masking layer contains metal powder and a white pigment. A laser beam applied to the laser-marking medium is absorbed by the base layer having laser light absorptivity, and the base layer heats and breaks, whereby the masking layer in the laser applied region is removed, and a lightness difference is generated between a laser beam non-applied region of the masking layer and the laser beam applied region with the masking layer removed so as to make marks in the laser beam applied region distinctly visible.

Laser-marking medium

Growing community of inventors

Tokyo-to, Japan

Masahiro Shimoyamada