STRUCTURE, METHOD OF FORMING STRUCTURE, METHOD OF LASER PROCESSING, AND METHOD OF DISCRIMINATING BETWEEN TRUE AND FALSE OBJECTS

• Main Authors: YUASA YOSHIYUKI, TAKENOUCHI KEN, HOSONO HIROKO, KURODA HITOMI, HIRAKAWA NOBUO
• Format: Patent
• Language: English
• Published: 10.03.2011
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHECKING-DEVICES; CLADDING OR PLATING BY SOLDERING OR WELDING; COLORIMETRY; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACHINE TOOLS; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PHYSICS; RADIATION PYROMETRY; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SOLDERING OR UNSOLDERING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING; TRANSPORTING; WELDING; WORKING BY LASER BEAM; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Laser marking is surely conducted on the second and subsequent layers of a structural body with a multilayer structure, whereby a marked part can be prevented from being marred, fouled, falsified or erased, as well as marking can be conducted in a variety of colors. A structural body 10 including an inner layer 12 and an outer layer 11 stacked, wherein said inner layer 12 is formed of a resin which does not transmit light with a specific wavelength and said outer layer 11 is formed of a resin which transmits light with the specific wavelength, and a fine periodic structure 14 in the form of convexes and concaves formed by generation of photodecomposition is provided on at least part of the surfaces 13 of the inner layer 12 which is opposite to the outer layer 11.