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AssigneeNippon Oil Co., Ltd.
InventorsSatoshi Murouchi, Toshio Nakayama, Yoshikuni Yamada
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An optical pickup lens holder which comprises a wholly aromatic liquid crystalline polyester resin composition comprising 97 to 45 mass percent of a wholly aromatic liquid crystalline polyester having a melting point of 320° C. or higher, 3 to 50 mass percent of an inorganic spherical hollow material having an aspect ratio of 2 or less and 0 to 30 mass percent of an inorganic filler having as aspect ratio of 4 or more, wherein the percentages are made to 100 mass percent in total, and having a specific gravity in the range of 1.00 to 1.35. The lens holder exhibits excellent characteristics, while retaining good heat resistance in soldering and good processability inherent in a liquid crystalline polyester, exhibits high injection processability and high adaptability to a soldering process even in a sheet form lens holder having a thin part and an opening port.
A wholly aromatic liquid crystal polyester resin composition injection molded to form an optical pickup lens holder, the optical pickup lens holder having a specific gravity in a range of 1.00 to 1.35, and having a part and an opening portion holding a lens, said part having a thickness of 0.3 mm or less, the composition comprising (a) 97 to 45 percent by mass of a wholly aromatic liquid crystal polyester having a melting point of 320° C. or higher and an apparent viscosity at 20° C. above the melting point of 5,000 poise or less, (b) 3 to 50 percent by mass of an inorganic spherical hollow material having an aspect ratio of 2 or less, and (c) 0 percent by mass of an inorganic filler having an aspect ratio of 4 or more.
An optical pickup lens holder in a sheet form driven by a focusing coil and a tracking coil, comprising an injection molded product, the injection molded product having a specific gravity in a range of 1.00 to 1.35, obtained from a wholly aromatic liquid crystal polyester resin composition, comprising 97 to 45 percent by mass of a wholly aromatic liquid crystal polyester having a melting point of 320° C. or higher and an apparent viscosity at 20° C. above the melting point of 5,000 poise or less, 3 to 50 percent by mass of the inorganic spherical hollow material having an aspect ratio of 2 or less, and 0 percent by mass of the inorganic filler having an aspect ratio of 4 or more, wherein said optical pickup lens holder comprises a part with thickness of 0.3 mm or less, and said part has a flexural modulus of 10 GPa or more.
Dependencies are inferred from the claim text.