公开(公告)号：US20090223476A1

公开(公告)日：2009-09-10

申请号：US12379915

申请日：2009-03-04

申请人： Fumihiro Shinkai ,  Koichi Maruyama ,  Toshihiro Kawai ,  Kiyoshi Naiki ,  Takanori Kawazu ,  Takeshi Murakami ,  Takashi Tsukiyama

发明人： Fumihiro Shinkai ,  Koichi Maruyama ,  Toshihiro Kawai ,  Kiyoshi Naiki ,  Takanori Kawazu ,  Takeshi Murakami ,  Takashi Tsukiyama

IPC分类号： F02M35/10

CPC分类号： F02M26/20 ,  F02M26/12 ,  F02M26/44 ,  F02M26/50 ,  Y02T10/142

摘要： A gas introducing structure of an intake path includes a gas introducing path introducing a gas into an intake airflow in the intake path of an internal combustion engine, wherein an inner peripheral surface of the gas introducing path is made of a bottom surface appearing as a straight line at a lower side of a perpendicular cross section of the inner peripheral surface and a curved wall surface appearing as a convex curved line, connecting with each end of the straight line at an angle, at an upper side of the perpendicular cross section of the inner peripheral surface.

摘要翻译： 进气道的气体导入结构包括：气体导入路径，其将气体导入到内燃机的进气通路中的进气口中，其中，气体导入路径的内周面由作为直线的底面 在内周面的垂直截面的下侧的线，以及作为凸曲线显示的弯曲壁面，在与该直线的垂直截面的上侧成一定角度的直线的两端连接 内周面。

公开(公告)号：US20060181978A1

公开(公告)日：2006-08-17

申请号：US11352324

申请日：2006-02-13

申请人： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

发明人： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC分类号： G11B7/00

CPC分类号： G11B7/1367 ,  G11B7/13922 ,  G11B2007/0006

摘要： A optical system of an optical pick-up is provided. The optical system includes an optical element including at least a phase shift surface among the surfaces thereof, and located closer to a light source than the objective lens. In this configuration, t1≦t2 is satisfied, where t1 represents a thickness of a cover layer of a first optical disc for which a first laser beam is employed, and t2 a thickness of a cover layer of a second optical disc for which a second laser beam, having a longer wavelength than the first laser beam, is employed. NA1≧NA2 is satisfied, where NA1 represents a numerical aperture for the first optical disc, and NA 2 the numerical aperture for the second optical disc. The phase shift surface includes a first region that converges the first laser beam on a recording surface of the first optical disc, and the second laser beam on a recording surface of the second optical disc. The first region includes at least an annular zone structure having an annular zone group including a step that gives an additional optical path length to the first laser beam generally by two wavelengths, with respect to an inner refracting surface at a boundary between adjacent refracting surfaces, and a return step portion located at an outer position of the annular zone group. The return step includes a step that gives an additional optical path length to the first laser beam generally by three wavelengths with respect to an inner refracting surface located inside of the return step, in an opposite direction to the step of the annular zone group.

摘要翻译： 提供光学拾取器的光学系统。 光学系统包括在其表面中至少包括相移表面并且位于比物镜更靠近光源的光学元件。 在这种配置中，满足t 1 <= t 2，其中t 1表示使用第一激光束的第一光盘的覆盖层的厚度，t 2表示第二光学器件的覆盖层的厚度 使用具有比第一激光束长的波长的第二激光束的光盘。 NA 1> = NA 2，其中NA 1表示第一光盘的数值孔径，NA 2表示第二光盘的数值孔径。 相移表面包括将第一激光束会聚在第一光盘的记录表面上的第一区域和在第二光盘的记录表面上的第二激光束。 第一区域至少包括具有环形区域组的环形区域结构，所述环形区域组包括相对于相邻折射表面之间的边界处的内部折射表面给予第一激光束的附加光程长度通常为两个波长的步骤， 以及位于所述环形区域组的外部位置的返回台阶部。 返回步骤包括以与环形区域组的台阶相反的方向相对于位于返回步骤内部的内部折射表面通常相对于第一激光束附加光路长度的步骤。

公开(公告)号：US20060114796A1

公开(公告)日：2006-06-01

申请号：US11289386

申请日：2005-11-30

申请人： Koichi Maruyama ,  Yoshiyuki Tashiro ,  Daisuke Koreeda

发明人： Koichi Maruyama ,  Yoshiyuki Tashiro ,  Daisuke Koreeda

IPC分类号： G11B7/00

CPC分类号： G11B7/1367 ,  G02B27/42 ,  G02B27/4238 ,  G02B27/4294 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： A method of designing an optical element to be used for an optical system in which each of a plurality of light beams having different design wavelengths passes through the optical element is provided. The method includes determining at least two types of optical path difference functions including first and second optical path difference functions in such a manner that proportion, brought by the first optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized is different from proportion, brought by the second optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized, and obtaining a shape defined by combining the at least two types of optical path difference functions so as to apply the obtained shape to at least one surface of surfaces of the optical element.

摘要翻译： 提供一种设计用于光学系统的光学元件的方法，其中具有不同设计波长的多个光束中的每一个通过光学元件。 该方法包括确定包括第一和第二光程差函数的至少两种类型的光程差函数，使得由第一光程差函数带来的比例在衍射级之间，衍射级之间的多个光束的衍射效率 最大化不同于由第二光程差函数引起的比例，在多个光束的衍射效率最大化的衍射级之间，并且获得通过组合至少两种类型的光程差函数而定义的形状 以将获得的形状应用于光学元件的表面的至少一个表面。

公开(公告)号：US06900949B2

公开(公告)日：2005-05-31

申请号：US10761318

申请日：2004-01-22

申请人： Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

发明人： Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

IPC分类号： G02B3/02 ,  G02B13/00 ,  G02B13/18 ,  G11B3/74 ,  G11B7/00 ,  G11B7/135 ,  G11B7/20

CPC分类号： G11B7/1353 ,  G11B7/1374 ,  G11B7/1378 ,  G11B7/13922 ,  G11B2007/0006

摘要： An optical system of an optical pick-up for a plurality of types of optical discs with a corresponding plurality of light sources. A first coupling lens that is used at least for the first optical disc, and an objective lens that is used for the plurality of types of optical discs. A beam for the first optical disc emitted by the plurality of light sources passes through the first coupling lens and is incident on the objective lens as a diverging beam. The diverging beam being given spherical aberration by the coupling lens. When the objective lens shift occurs, a coma component relating to the spherical aberration of the diverging beam which is shifted with respect to the objective lens due to the shift of the objective lens is canceled by a coma generated by the objective lens and the cover layer of the first optical disc.

摘要翻译： 一种用于具有相应多个光源的多种类型的光盘的光学拾取器的光学系统。 至少用于第一光盘的第一耦合透镜和用于多种类型的光盘的物镜。 用于由多个光源发射的第一光盘的光束穿过第一耦合透镜并作为发散光束入射在物镜上。 发散光束由耦合透镜给出球面像差。 当发生物镜偏移时，由于物镜的偏移而相对于物镜偏移的发散光束的球面像差的彗差成分被物镜和覆盖层产生的彗形消除 的第一光盘。

公开(公告)号：US06822800B2

公开(公告)日：2004-11-23

申请号：US10456674

申请日：2003-06-09

申请人： Daisuke Koreeda ,  Koichi Maruyama

发明人： Daisuke Koreeda ,  Koichi Maruyama

IPC分类号： G02B2700

CPC分类号： G11B7/1374 ,  G02B3/08 ,  G02B7/028 ,  G11B7/13922

摘要： An objective lens for an optical pickup has a single lens element. One surface of the objective lens is divided into a central area and a peripheral area, and a step providing a level difference along a direction of the optical axis is formed at a boundary therebetween. The step provides a phase shift between light passing through the central area and the peripheral area. The level difference is formed such that a thickness on the peripheral area side is greater than a thickness on the central area side at the boundary. In one case, the objective lens satisfies a condition: 0.83

摘要翻译： 用于光学拾取器的物镜具有单个透镜元件。 物镜的一个表面被分成中心区域和周边区域，并且在它们之间的边界处形成沿着光轴方向提供水平差的台阶。 该步骤提供穿过中心区域的光和外围区域之间的相移。 水平差形成为周边区域侧的厚度大于边界处的中央区域侧的厚度。 在一种情况下，物镜满足条件：其中hx是边界的半径，hmax是限定由台阶形成的表面的数值孔径的有效半径。

公开(公告)号：US06791934B2

公开(公告)日：2004-09-14

申请号：US10076663

申请日：2002-02-19

申请人： Takeshi Shimano ,  Tetsuo Ariyoshi ,  Kazuo Shigematsu ,  Koichi Maruyama ,  Shuichi Takeuchi

发明人： Takeshi Shimano ,  Tetsuo Ariyoshi ,  Kazuo Shigematsu ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC分类号： G11B700

CPC分类号： G11B7/1378 ,  G11B7/093 ,  G11B7/0935 ,  G11B7/0943 ,  G11B7/13927

摘要： When it is intended to realize a lens having a large NA with one lens, an adjustment precision between both surfaces of the lens is very strict. Accordingly an objective lens having an NA of 0.8 or more was usually realized by two lenses. However, a working distance is small, and collision of the objective lens with a disc is apt to occur. A coma corrector for compensating coma caused by decentering of both surfaces in realizing the high NA lens with one lens is added. However, in this case, astigmatism occurs when the objective lens decenters from the coma corrector relatively accompanied with a tracking operation. The objective lens and the coma corrector are fixed to a mirror barrel so as to be unified with each other, and driven by a two-dimensional lens actuator. With such a constitution, decentering of the objective lens and the coma corrector does not occur, and hence astigmatism does not occur.

摘要翻译： 当想要实现具有一个透镜的具有大NA的透镜时，透镜的两个表面之间的调节精度非常严格。 因此，通常通过两个透镜实现NA为0.8以上的物镜。 然而，工作距离小，容易发生物镜与盘的碰撞。 添加了一个用于补偿由两个表面偏心造成的实现具有一个透镜的高NA透镜的昏迷校正器。 然而，在这种情况下，当物镜相对于跟踪操作相对于昏迷校正器偏离时，发生散光。 物镜和彗差校正器被固定到镜筒上，以便彼此一体化，并由二维透镜致动器驱动。 通过这样的结构，不会发生物镜和昏迷校正器的偏心，因此不发生散光。

公开(公告)号：US06791932B1

公开(公告)日：2004-09-14

申请号：US09556416

申请日：2000-04-24

申请人： Koichi Maruyama

发明人： Koichi Maruyama

IPC分类号： G11B700

CPC分类号： G11B7/1374 ,  G11B7/1353 ,  G11B7/1378 ,  G11B2007/0006

摘要： An optical system of an optical pick-up that is capable of using thin cover type and thick cover type optical discs. The system includes a light source portion for emitting a short wavelength laser beam for the thin cover type optical disc and a long wavelength laser beam for the thick cover type optical disc, and an objective lens for converging the laser beam onto an information layer of the optical disc through the cover layer. The objective lens has a diffractive lens structure having wavelength dependence such that spherical aberration varies in the overcorrected direction as incident wavelength increases. The light source portion emits the laser beam such that divergence of the long wavelength laser beam incident on the objective lens is larger than that of the short wavelength laser beam. The objective lens converges the laser beams of an identical diffractive order without changing position thereof.

摘要翻译： 能够使用薄盖型和厚盖型光盘的光学拾取器的光学系统。 该系统包括用于发射用于薄盖型光盘的短波长激光束的光源部分和用于厚盖型光盘的长波长激光束，以及用于将激光束会聚到信息层上的物镜 光盘通过覆盖层。 物镜具有具有波长依赖性的衍射透镜结构，使得随着入射波长的增加，球面像差在过矫正方向上变化。 光源部分发射激光束，使得入射在物镜上的长波长激光束的发散度大于短波长激光束的发散。 物镜会聚相同衍射级的激光束而不改变其位置。

公开(公告)号：US06785203B2

公开(公告)日：2004-08-31

申请号：US09793544

申请日：2001-02-27

申请人： Koichi Maruyama ,  Takeshi Shimano ,  Shigeru Nakamura ,  Akira Arimoto ,  Kazuo Shigematsu

发明人： Koichi Maruyama ,  Takeshi Shimano ,  Shigeru Nakamura ,  Akira Arimoto ,  Kazuo Shigematsu

IPC分类号： G11B709

CPC分类号： G11B7/1374 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/13922 ,  G11B2007/0006

摘要： An objective lens converges a shorter wavelength laser beam on a DVD having a protective layer, which is 0.6 mm thick, and a longer wavelength laser beam on a CD having a protective layer, which is 1.2 mm thick. A common region is defined on the objective lens. The common region provides a numerical aperture appropriate for converging the longer wavelength laser beam on the CD. Coma of the objective lens in the first region is compensated better in a case where the longer wavelength laser beam is converged on the CD than a case where the shorter wavelength laser beam is converged on the DVD.

摘要翻译： 物镜将较短波长的激光束会聚在具有0.6mm厚的保护层的DVD上，并且在具有1.2mm厚的保护层的CD上具有较长波长的激光束。 在物镜上定义公共区域。 公共区域提供适合于将更长波长的激光束会聚在CD上的数值孔径。 在较长波长的激光束会聚在CD上的情况下，比较短波长的激光束会聚在DVD上的情况更好地补偿第一区域中的物镜的昏迷。

公开(公告)号：US06480344B1

公开(公告)日：2002-11-12

申请号：US09716291

申请日：2000-11-21

申请人： Koichi Maruyama

发明人： Koichi Maruyama

IPC分类号： G02B310

CPC分类号： G11B7/1374 ,  G02B27/0037 ,  G02B27/4216 ,  G11B7/0948 ,  G11B7/1353 ,  G11B7/13927 ,  G11B2007/0006

摘要： An objective lens includes a refractive lens having a positive refractive power, and a diffractive lens structure having a plurality of concentric ring-shaped steps that are formed on a lens surface of the refractive lens. The objective lens is a biconvex plastic lens having first and second aspherical surfaces. The diffractive lens structure has such a wavelength dependence that at least two diffracted beams having different wavelengths with the same diffraction order form appropriate wavefronts for at least two kinds of optical discs having cover layers of different thickness, respectively. Further, the diffractive lens structure has a predetermined power at any points in a middle ring area that is concentrically arranged about the optical axis at a middle range of the radius of the refractive lens.

摘要翻译： 物镜包括具有正折光力的折射透镜和具有形成在折射透镜的透镜表面上的多个同心环状台阶的衍射透镜结构。 物镜是具有第一和第二非球面的双凸透镜。 衍射透镜结构具有这样的波长依赖性，即对于具有不同厚度的覆盖层的至少两种光盘，分别具有相同衍射级的具有不同波长的至少两个衍射光束形成适当的波前。 此外，衍射透镜结构在折射透镜的半径的中间范围内围绕光轴同心布置的中间环区域中的任何点具有预定的功率。

公开(公告)号：US06473387B1

公开(公告)日：2002-10-29

申请号：US09655880

申请日：2000-09-06

申请人： Koichi Maruyama ,  Takashi Yamanouchi

发明人： Koichi Maruyama ,  Takashi Yamanouchi

IPC分类号： G11B700

CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/1275 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： Disclosed is an optical disc apparatus that is adapted for DVD, CD and CD-R. The optical system includes a laser module and an objective lens that converges a divergent laser beam emitted from the laser module onto information layers of optical discs. The laser module is provided with a pair of emission points that are in close proximity to each other, and a pair of light receiving elements. A focusing mechanism moves the objective lens so that the beam spot follows an information layer of the optical disc. The objective lens is provided with the diffractive lens structure to have a wavelength dependence such that the spherical aberration varies in response to the change of the wavelength. Thereby, the variation of the spherical aberration due to the change of the thickness of the cover layer can be canceled by changing the wavelength.

摘要翻译： 公开了适用于DVD，CD和CD-R的光盘装置。 光学系统包括激光模块和物镜，其将从激光模块发射的发散激光束会聚到光盘的信息层上。 激光模块设置有彼此非常接近的一对发射点和一对光接收元件。 聚焦机构使物镜移动，使得光点跟随光盘的信息层。 物镜设置有衍射透镜结构以具有波长依赖性，使得球面像差响应于波长的变化而变化。 由此，可以通过改变波长来抵消由于覆盖层的厚度变化引起的球面像差的变化。