Method of discoloration of metal compounds by irradiation of las

Details Method of discoloration of metal compounds by irradiation of las Method of discoloration of metal compounds by irradiation of las

1975-05-15

1977-01-04

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204DIG11, B01J 110

Patent

active

040010953

ABSTRACT:
When laser rays are radiated on metallic compounds sucn as oxides, hydroxides, sulfides, carbonates, chromates and titanates, colors of these metallic compounds can be changed at high speeds. By application of this discoloration technique, it is made possible to cause discoloration selectively even at very minute areas of molded articles of these metallic compounds. Therefore, this technique can be applied advantageously and effectivey to recording, image reproduction and formation of electric circuits. If these metallic compounds especially oxides, are made semiconductors prior to irradiation of laser rays, the discoloration effects can be greatly enhanced. In conducting this method, laser rays having a wavelength from the visible to infrared region can be effectively employed.

REFERENCES:
anschel, IBM Technical Disclosure Bulletin, vol. 15, No. 2 (July 1972) pp. 603-604.
Martin, et al., Thin Solid Films, vol. 2 (1968) pp. 253-269.

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