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    • 1. 发明申请
    • OPTICAL HEAD APPARATUS
    • US20080253265A1
    • 2008-10-16
    • US11734535
    • 2007-04-12
    • Koichi MurataYoshiharu Ooi
    • Koichi MurataYoshiharu Ooi
    • G11B7/135
    • G11B7/1353G02B5/1828G02F1/1313G02F1/292G11B7/1369G11B2007/0006
    • The present invention provides an optical head apparatus having: a light source emitting a linearly-polarized light; an objective lens focusing a light source light emitted from the light source on an optical recording medium; a light detector receiving a return light generated by reflecting the light source light by the optical recording medium; and a variable diffraction device having: a first polarized light diffraction grating; and a second polarized light diffraction grating, the variable diffraction device: diffracting an incident light of the linearly-polarized light by one of the first polarized light diffraction grating and the second polarized light diffraction grating; and transmitting the incident light without diffraction by the other thereof, the first polarized light diffraction grating having: first stripes including an anisotropic transparent material; and second stripes including an isotropic transparent material, the first stripes and the second stripes being alternately arranged in a first direction and in a first pitch to fill each space; the second polarized light diffraction grating having: third stripes including an anisotropic transparent material; and fourth stripes including an isotropic transparent material, the third stripes and the fourth stripes being alternately arranged in a second direction and in a second pitch to fill each space; the first polarized light diffraction grating and the second polarized light diffraction grating being different in at least one of the pitches and the directions, the variable diffraction device being capable of switching: either the first polarized light diffraction grating or the second polarized light diffraction grating diffracting the incident light; and the other thereof transmitting the incident light without diffraction by changing refractive indices sensed by the incident light with respect to the first polarized light diffraction grating and the second polarized light diffraction grating by an externally applied electric signal.
    • 2. 发明授权
    • Optical head apparatus
    • 光头设备
    • US07835252B2
    • 2010-11-16
    • US11734535
    • 2007-04-12
    • Koichi MurataYoshiharu Ooi
    • Koichi MurataYoshiharu Ooi
    • G11B7/135
    • G11B7/1353G02B5/1828G02F1/1313G02F1/292G11B7/1369G11B2007/0006
    • An optical head apparatus includes a light source and an objective lens focusing a light source light on an optical recording medium. Also included is a light detector receiving a return light, and a variable diffraction device including a first polarized light diffraction grating; and a second polarized light diffraction grating. Provided that a polarizing direction diffracted by the first polarized light diffraction grating is defined as a first polarizing direction and a polarizing direction that is orthogonal to the first polarizing direction and not diffracted by the first polarized light diffraction grating is defined as a second polarizing direction, a ratio obtained from dividing a diffraction efficiency in the second polarizing direction by a diffraction efficiency in the first polarizing direction, of the first polarized light diffraction grating, is 0 to 0.5, and a ratio obtained from dividing a diffraction efficiency in the first polarizing direction by a diffraction efficiency in the second polarizing direction, of the second polarized light diffraction grating, is 0 to 0.5.
    • 光学头装置包括光源和将光源光聚焦在光学记录介质上的物镜。 还包括接收返回光的光检测器和包括第一偏振光衍射光栅的可变衍射装置; 和第二偏振光衍射光栅。 如果将由第一偏振光衍射光栅衍射的偏振方向定义为第一偏振方向,并将与第一偏振光衍射光栅不衍射的与第一偏振方向正交的偏振方向定义为第二偏振方向, 从第二偏振方向的衍射效率除以第一偏振光衍射光栅的第一偏振方向的衍射效率得到的比例为0〜0.5,并且从第一偏振方向的衍射效率 通过第二偏振光衍射光栅的第二偏振方向的衍射效率为0〜0.5。
    • 5. 发明授权
    • Phase plate and optical head device
    • 相位板和光头装置
    • US07782738B2
    • 2010-08-24
    • US11874547
    • 2007-10-18
    • Toshimasa KakiuchiKoichi Murata
    • Toshimasa KakiuchiKoichi Murata
    • G11B7/00
    • G02B5/3083G02B27/288G11B7/1353G11B7/1367G11B7/1381G11B2007/0006
    • A phase plate and an optical head device are provided, which are capable of suppressing changes of the amount of light incident on a light-receiving unit even if the phase difference caused by transmission through a protective layer of an optical recording medium differs depending on the type of optical recording medium.The phase plate includes a birefringent medium and produces a phase difference in linearly polarized light incident on the phase plate between a polarization component having a polarization direction parallel to the optic axis of the birefringent medium and a polarization component having a polarization direction perpendicular to the optic axis. In the phase plate, the birefringent medium includes a plurality of types of phase areas disposed adjacently; at least two types of adjacent phase areas are different from each other in phase differences, optic axes, or both phase differences and optic axes; and each of the plurality of types of phase areas is disposed so as to have two-fold rotational symmetry with respect to the optical axis of the phase plate.
    • 提供一种相位板和光学头装置,其能够抑制入射在光接收单元上的光量的变化,即使由于通过光记录介质的保护层的透射引起的相位差根据 类型的光记录介质。 相位板包括双折射介质,并且在具有平行于双折射介质的光轴的偏振方向的偏振分量和具有垂直于光学元件的偏振方向的偏振分量之间产生入射在相位板上的线偏振光的相位差 轴。 在相位板中,双折射介质包括相邻设置的多个相位区域; 至少两种类型的相邻区域在相位差,光轴或相位差和光轴两者中彼此不同; 并且多个类型的相位区域中的每一个被设置成相对于相位板的光轴具有双重旋转对称。
    • 8. 发明申请
    • Perfluoropolyether derivative
    • 全氟聚醚衍生物
    • US20050197408A1
    • 2005-09-08
    • US11107980
    • 2005-04-18
    • Daisuke ShirakawaTakashi OkazoeKazuya OharuShu-zhong WangKoichi MurataKengo Kawahara
    • Daisuke ShirakawaTakashi OkazoeKazuya OharuShu-zhong WangKoichi MurataKengo Kawahara
    • A61K31/08C08G65/00C10M107/38
    • C08G65/007C10M107/38C10M2213/043C10M2213/0606C10N2240/204
    • A novel perfluoropolyether derivative which is less likely to undergo decomposition, which is free from a problem of deterioration during its use, and which is useful as a lubricating oil or a coating agent, is provided. A compound represented by the following formula (1): HO—(CH2CH2O)r.(CH2CH (OH)CH2O)p—CH2CF2O(CF2CF2O)mCF2CH2O——(CH2CH(OH)CH2O)q.(CH2CH2O)s—H  Formula (1) wherein m represents an integer of from 3 to 200, and each of p, q, r and s which are independent of one another, represents an integer of from 0 to 100, provided that when each of p, q, r and s which are independent of one another, is an integer of at least 1, the arrangement of —(CH2CH2O)— and —(CH2CH(OH)CH2O)— units is not particularly limited, and when one of r and p is an integer of at least 2 and the other is an integer of at least 1, or when one of q and s is an integer of at least 2 and the other is an integer of at least 1, these units may be arranged in a block form or at random.
    • 提供了一种不太可能分解的新型全氟聚醚衍生物,其在使用中没有劣化的问题,并且其可用作润滑油或涂层剂。 由下式(1)表示的化合物:<?in-line-formula description =“In-line formula”end =“lead”?> HO-(CH 2 CH 2 (CH 2 CH(OH)CH 2 O)CH 2 CH(OH)CH 2 CH 2 2 CF 2 O 2(CF 2 CF 2 O)CF 2 O(CF 2 O 2 CF 2) 2 CH 2 - (CH 2 CH(OH)CH 2 O)q 其中m表示3〜200的整数,p,q,r和s彼此独立地表示0〜100的整数,条件是每当 彼此独立的p,q,r和s的整数为至少1的整数, - (CH 2 CH 2 CH 2 O)的排列 - 和 - (CH 2 CH(OH)CH 2 O) - 单元没有特别限制,当r和p中的一个为至少2的整数,另一个为 是至少为1的整数,或者q和s之一的整数 是至少为2的整数,另一个是至少为1的整数,这些单元可以以块形式或随机排列。