Lintec Corporation

Takehiko Nishikawa

Chisato Iino

Tetsuyuki Utagawa

Takeshi Segawa

Yuichi Iwakata

Hiroaki Iwabuchi

Soichiro Fujinaga

Naoji Noda

Kaoru Mizutani

In a process for recording into a rewritable recording medium of a non-contact type, when adjacent lines or adjacent overlapping lines are drawn by scanning the medium having a reversible heat sensitive color developing layer on a substrate with laser light and a second lineis drawn after a first lineis drawn, the time between the start of drawingand the end of drawingand/or the width of the overlapped portion r is controlled as the means for suppressing discoloration of the recorded lines by interference between heat remaining afterhas been drawn and heat generated whileis drawn. When characters, bar codes, solid images or figures are drawn into a rewritable recording medium of the non-contact type by scanning with laser light, excellent readability and visibility of the bar codes can be obtained in recording a plurality of line elements.

Process for recording into rewritable recording medium of non-contact type

A structure formed of a resin material with a built-in recording medium comprising at least a means for rewriting visible information with a laser light in a non-contact manner; a laminate comprising the structure and a method for recording in the non-contact manner using the structure or the laminate are disclosed. The recording and erasing of information in the recording medium can be conducted by irradiation with a laser light from outside. The laser light transmittance in a used wave length range and the visible light transmittance through a portion of the structure from a surface on which the laser light is irradiated to the recording medium are in a specified range. Surface destruction of the recording medium due to laser light on rewriting visible information, decrease in durability during cleaning, damages on the recording medium during transportation and deterioration in the color developing property due to light can be overcome.

Structure with a built-in recording medium, a laminate comprising the structure and method for recording in non-contact manner using the structure and the laminate

An IC tag has a layer of heat sensitive color developing material (I), a layer of material absorbing light and converting absorbed light into heat (II) and a protective layer (III) laminated on the surface of the support successively from the surface, or (II), (I) and (III) laminated on the surface of the support successively from the surface. This structure permits recording and erasing invisible information and recording and erasing visible information, both allowing recording and erasing information in a non-contact manner. The structure is flexible and can have a small size.

IC tag, reader/writer for the IC tag and system using the IC tag

A material film for a mask film comprising a substrate film transmitting ultraviolet light and a resin layer not transmitting ultraviolet light disposed on one face of the substrate film, the resin layer having a color which can be eliminated by irradiation with laser beams, a transmittance of ultraviolet light of 0.1% or smaller, a thickness of 0.1-30 &#x3bc;m and an average surface roughness on a central line Ra of 0.1-3 &#x3bc;m and comprising carbon black having an average particle diameter of 20-50 nm and a specific surface area of 70-150 m/g. The resin layer exhibits uniform transparency at portions the color of which is eliminated and suppresses formation of scratches. The mask film is easily positioned in preparation of great printing plates and good contact is easily attained throughout the entire surface suppressing containment of air between the mask film and the printing plate material.

Material film for a mask film, process for producing a mask film using the material film and process for producing a printing plate of a photosensitive resin

A method for recording information into a rewritable thermal label of a non-contact type by irradiation with a laser beam is provided. When a prescribed drawing is conducted by irradiation with a laser beam focused on the rewritable thermal label of a non-contact type using an optical scanning apparatus, the optical scanning apparatus is driven continuously without activating oscillation for the laser beam, and the drawing is conducted by activating the oscillation for the laser beam and scanning with the laser beam only when a locus of a laser beam which would be emitted if the oscillation for the laser beam would be active (a virtual laser beam) moves at a substantially uniform speed. Damages to the recording face of a recording medium after repeated recording and erasure of information by a non-contact method are decreased, and the recording medium can be used repeatedly 1,000 times or more.

Growing community of inventors

Saitama, Japan

Takehiko Nishikawa