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151 条记录 (耗时 0.035 秒)

    Objective lens for optical pick-up
    12.
    发明授权
    Objective lens for optical pick-up 有权
    物镜用于光学拾取

    公开(公告)号：US06191889B1

    公开(公告)日：2001-02-20

    申请号：US09321544

    申请日：1999-05-28

    申请人： Koichi Maruyama

    发明人： Koichi Maruyama

    IPC分类号： G02B0518

    CPC分类号： G11B7/1353 ,  G11B7/1372

    摘要： An objective lens includes a refractive lens having a positive refractive power, and a diffractive grating having a plurality of concentric ring-shaped steps that are formed on at least one lens surface of the refractive lens. The objective lens is a biconvex plastic lens of which first and second surfaces are aspherical. A diffractive grating is formed on the first surface of the objective lens. The diffractive grating is similar to a Fresnel lens, it is formed as many concentric rings each of which has a wedge sectional shape. The boundary between the adjacent rings is a step to give a predetermined optical path difference. The diffractive grating has wavelength dependence such that spherical aberration varies in the undercorrected direction as wavelength of incident light increases.

    摘要翻译： 物镜包括具有正折光力的折射透镜，以及具有形成在折射透镜的至少一个透镜表面上的多个同心环形台阶的衍射光栅。 物镜是双凸透镜，其第一和第二表面是非球面的。 在物镜的第一表面上形成衍射光栅。 衍射光栅类似于菲涅尔透镜，其形成为多个具有楔形截面形状的同心环。 相邻环之间的边界是给出预定光程差的步骤。 衍射光栅具有波长依赖性，使得随着入射光的波长的增加，球面像差在校正不正确的方向上变化。

    Multibeam recording device
    14.
    发明授权
    Multibeam recording device 失效
    多波束记录装置

    公开(公告)号：US5745296A

    公开(公告)日：1998-04-28

    申请号：US648767

    申请日：1996-05-16

    申请人： Tetsuya Nakamura ,  Koichi Maruyama ,  Takashi Iizuka

    发明人： Tetsuya Nakamura ,  Koichi Maruyama ,  Takashi Iizuka

    IPC分类号： G02B26/12 ,  G02B27/10

    CPC分类号： G02B26/123

    摘要： Lens arrangements for a multibeam recording device include a first lens group that forms collimated beams paired with a second lens group, allowing the second lens group to be moved for focusing. A first lens group forms non-collimated beams is paired with a second lens group, allowing one lens group to be moved for magnification change. A first lens group forms non-collimated beams between internal portions and collimated beams leading to a second lens group, allowing magnification change by moving the two portions and focus change by moving the second lens group. A first lens group having two movable portions is paired with a second lens group, both movable portions being shiftable and tiltable to correct for decentering errors. Three concrete reduction lens system examples applicable in each of the embodiments use positive anomalous dispersion glass, allowing low dispersion and the use of blue LEDs to increase the imaging resolution.

    摘要翻译： 用于多光束记录装置的透镜装置包括形成与第二透镜组成对的准直光束的第一透镜组，允许第二透镜组移动以进行聚焦。 形成非准直光束的第一透镜组与第二透镜组配对，允许一个透镜组移动以进行放大改变。 第一透镜组在内部部分和通过第二透镜组的准直光束之间形成非准直光束，通过移动两个部分并通过移动第二透镜组来聚焦变化来允许倍率变化。 具有两个可移动部分的第一透镜组与第二透镜组成对，两个可移动部分都是可移动和可倾斜的，以校正偏心误差。 适用于每个实施例的三个具体的减速透镜系统示例使用正异常色散玻璃，允许低色散和使用蓝色LED来增加成像分辨率。

    Optical system of optical information recording/reproducing apparatus
    15.
    发明授权
    Optical system of optical information recording/reproducing apparatus 失效
    光信息记录/再现装置的光学系统

    公开(公告)号：US5657171A

    公开(公告)日：1997-08-12

    申请号：US527975

    申请日：1995-09-14

    申请人： Koichi Maruyama ,  Makoto Iwaki

    发明人： Koichi Maruyama ,  Makoto Iwaki

    IPC分类号： G02B27/00 ,  G11B7/135 ,  G02B9/04

    CPC分类号： G11B7/1372 ,  G02B27/0025 ,  G11B7/1378 ,  G11B7/13922

    摘要： An optical system of an optical information recording/reproducing apparatus including a light source, an objective lens, and a chromatic aberration correcting element is provided and also includes a mechanism for independently actuating the objective lens. A beam splitter for splitting the luminous flux reflected by a medium can also be provided. The chromatic aberration correcting element is formed of a positive lens and a negative lens cemented together and satisfies the relation .vertline.n.sub.p -n.sub.n .vertline..times.10.sup.-5

    摘要翻译： 提供了包括光源，物镜和色像差校正元件的光学信息记录/再现设备的光学系统，并且还包括用于独立地致动物镜的机构。 还可以提供用于分离由介质反射的光通量的分束器。 色像差校正元件由正透镜和负透镜粘合在一起形成，满足关系| np-nn | x10-5 <300，其中正透镜使用的中心波长的折射率由np 负透镜的折射率由nn表示。

    Optical system of optical information recording/reproducing apparatus
    18.
    发明授权
    Optical system of optical information recording/reproducing apparatus 失效
    光信息记录/再现装置的光学系统

    公开(公告)号：US5321550A

    公开(公告)日：1994-06-14

    申请号：US005187

    申请日：1993-01-14

    申请人： Koichi Maruyama ,  Makoto Iwaki

    发明人： Koichi Maruyama ,  Makoto Iwaki

    IPC分类号： G02B27/00 ,  G11B7/135 ,  G02B27/10 ,  G02B9/04

    CPC分类号： G11B7/1372 ,  G02B27/0025 ,  G11B7/1378 ,  G11B7/13922

    摘要： An optical system of an optical information recording/reproducing apparatus including a light source for emitting a generally parallel luminous flux; an objective optical system for converging the luminous flux emitted from the light source onto a medium; a beam splitter for splitting the luminous flux reflected by the medium from a light path directed to the light source and guiding the same to a light receiving system; a chromatic aberration correcting element having almost no power disposed between the objective lens and the beam splitter and adapted to correct a chromatic aberration of the objective lens; and means for independently actuating the objective lens at least in an optical axis direction thereof.

    摘要翻译： 一种光信息记录/再现装置的光学系统，包括用于发射大致平行光通量的光源; 用于将从光源发射的光束会聚到介质上的物镜光学系统; 分束器，用于将由介质反射的光束从指向光源的光路分解并将其引导到光接收系统; 色差校正元件几乎没有设置在物镜和分束器之间并且适于校正物镜的色差的功率; 以及用于至少在其光轴方向独立地致动物镜的装置。