著者

Yamaguchi Atsushi Kodama Yasuhiro Matsuo Hiroto Ohno Minoru Osugi Satomi Maeno Yoshiaki Higuchi Masahiro

出版者

INSTITUTE OF PURE AND APPLIED PHYSICS

雑誌

Jpn J Appl Phys (ISSN:00214922)

巻号頁・発行日

vol.45, no.8, pp.6326-6327, 2006-08-15

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Polylactic acid (PLA) is a biomass material made of starch. Compact disc recordable (CD-R) discs with a PLA substrate were prepared and their properties were measured. Although the glass transition point of PLA is lower than that of polycarbonate (PC), the PLA substrate is usable for CD-R discs. It was confirmed that the substrate is usable for recordable optical discs at temperatures under 50 °C.

著者

Yamaguchi Atsushi Hibino Katsutoshi Suzuki Yoshihisa Terasaki Hitoshi Ichiura Shuichi

出版者

INSTITUTE OF PURE AND APPLIED PHYSICS

雑誌

Jpn J Appl Phys (ISSN:00214922)

巻号頁・発行日

vol.45, no.2, pp.1129-1130, 2006-02-15

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A laser beam axis compensator was fabricated for an optical pickup unit with blue and red lasers. The device consisted of multiwavelength wave plates and a double-refractive-index material. The wave plates were realized by a photonic crystal technique. By measuring the beam profiles of the blue and red lasers, the device was confirmed to function as a laser axis compensator. Under 110 μm laser beam axis shift setting conditions, readout signal patterns from an optical disc were measured.

著者

Sako Teiyu Kimura Yasuyuki Hayakawa Reinosuke Okabe Nobuhiro Suzuki Yoshiichi

出版者

INSTITUTE OF PURE AND APPLIED PHYSICS

雑誌

Jpn J Appl Phys (ISSN:00214922)

巻号頁・発行日

vol.35, no.2, pp.679-682, 1996-02-15

被引用文献数

4

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The Smectic-A (SmA) phases of the antiferroelectric liquid crystals (R)-MHPOBC, (R)-MHPOCBC and slightly racemized MHPOBC (R:S=17:3) have been studied by means of simultaneous measurements of the electric displacement and the tilt angle induced by the electric field. The SmA–SmCα* phase transition was observed in (R)-MHPOBC and (R)-MHPOCBC, while a phase transition similar to the SmA–SmC* one was observed in slightly racemized MHPOBC. In both cases, the Landau-type phenomenological theory explains well the critical behavior in the SmA phase, and the coefficients related to the theory can be determined.