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Volume 36 (1999)
- Issue 6 Pages 346-
- Issue 5 Pages 298-
- Issue 4 Pages 226-
- Issue 3 Pages 148-
- Issue 2 Pages 82-
- Issue 1 Pages 2-
Volume 36, Issue 6
Displaying 1-5 of 5 articles from this issue
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Recent Progress in High-Power LasersToshiro HAYAKAWA1999 Volume 36 Issue 6 Pages 346-352
Published: November 30, 1999
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSBasic technology and recent progress in high-power lasers are reviewed. Technology building blocks of major laser systems are briefly described. As key exposure sources in printing and publishing field, high-power semiconductor lasers, solid-state lasers, second-harmonic generation, and fiber lasers are described in detail.View full abstractDownload PDF (3661K) -
Laser Imaging TechnologyEiichi TAMAKI1999 Volume 36 Issue 6 Pages 353-359
Published: November 30, 1999
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSOptics and related technologies used in laser imagers are discussed. First how optics propagates a laser beam is epitomized. The theory of Gaussian beam propagation is good for most gas lasers and solid-state lasers; however, a laser beam radiated by a high-power laser diode with a long emitter has to be dealt with another way. Second three types of laser scanning systems are reviewed. Choice of a scanner is essential to optimization of a laser imaging system. Finally the features of some latest products are mentioned to exemplify that laser imager design and media characteristics are heavily dependent on each other.View full abstractDownload PDF (2176K) -
High Density Photo-recording MaterialsShigeru TAKAHARA, Nobukazu MIYAGAWA1999 Volume 36 Issue 6 Pages 360-365
Published: November 30, 1999
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSPopulation of computers and informational data make progress of recording media. They are changing from magnetic recordings, for example, a floppy disk, into optical recordings. Here, we focus on the recording media using laser, which are the high density photo-recording materials. The high density recordings have been researched and developed, because a diode laser is easily available with low price and compact size. We report 3-types of the media classified as -ROM (read only memory), -R (Recordable, write-once), and -RAM (-RW) (random access memory, rewritable) and three types of mechanisms those are magneto-optical, phase-change, and decomposition of materials. These are various materials for the optical recording layer, such as inorganic, organic, and inorganic-organic hybrid materials. Moreover, the capacity of the recording progresses from mega-byte to giga-byte.View full abstractDownload PDF (2423K) -
Kenji SUZUKI, Ken'ichi KOSEKI, Takeshi AMARI1999 Volume 36 Issue 6 Pages 366-372
Published: November 30, 1999
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSIn general, print quality of ink-jet printing is dependent on physical properties of ink and substrate. In this study, print quality was evaluated using three kinds of substrate, i.e., two kinds of coated paper with different coated layer thicknesses and PPC paper by applying dye based ink at the same speed as the practical printing process. Jetting phenomenon was investigated by the Jet Formation Monitoring System and the effects of scanning speed of print head were investigated by Dynanic Simulator. Print quality was evaluated by three parameters of the dot, i.e., dot spreading on the substrate, fractal dimension and optical density of the dot. As the result, the relationship between the properties of the substrate and these parameters which are dependent on penetration phenomenon was obtained. Furthermore, we are proposing the Triangle Method which combines these three parameters to evaluate the print quality. By this method, we can obtain useful information for quantitative evaluation of print quality.View full abstractDownload PDF (3638K) -
Laser plate by melt and penetration of a polymerJun NISHIMURA, Sakiko NAKAMURA, Katsuyoshi HOSHINO, Takashi KITAMURA1999 Volume 36 Issue 6 Pages 373-381
Published: November 30, 1999
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSA new laser thermal direct plate-making process is proposed for waterless offset printing and/or conventional lithographic printing. The CTP type plate we are proposing and studied consists of a surface polymer layer doped with an infrared-light absorbing dye, a porous polymer layer where inorganic ZnO pigment is dispersed and a base polymer film. When this plate is exposed with laser light, the surface layer is molten by the heat generated from the dye. The molten polymer penetrates into the voids of the porous polymer layer cropping out print image. The surface of the image cropping out of the porous polymer layer is ink receptive. Therefore, either dryographyic plate or lithographic plate will be obtained depending upon the selection of silicone polymer or hydrophilic polymer as the surface polymer. Using typical materials and observing with scanning electron microscope, we are reporting the results of our study on the image recording property and the recorded dot shape.View full abstractDownload PDF (4859K)
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