公开(公告)号：US07430159B2

公开(公告)日：2008-09-30

申请号：US11036989

申请日：2005-01-19

申请人： Daisuke Koreeda ,  Koichi Maruyama

发明人： Daisuke Koreeda ,  Koichi Maruyama

IPC分类号： G11B7/00

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

摘要： There is provided an optical pick-up used for recording data to and/or reproducing data from at least three types of optical discs having at least two different thicknesses of cover layers. The optical pick-up includes light sources and an objective lens. A thickness t1 of a first optical disc, a thickness t2 of a second optical disc, and a thickness t3 of a third optical disc satisfy a relationship t1≦t2 NA3. Further, a first light beam for the first optical disc is incident on the objective lens as a converging light beam, and the second and third light beams for the second and third optical discs are incident on the objective lens as diverging light beams, respectively. Given that magnification of the objective lens is m1 when the first optical disc is used, magnification of the objective lens is m2 when the second optical disc is used, and magnification of the objective lens is m3 when the first optical disc is used, following conditions are satisfied: m1>0, m3

摘要翻译： 提供了一种用于将数据记录到至少三种类型的具有至少两个不同厚度的覆盖层厚度的光盘中的数据的光学拾取器。 光学拾取器包括光源和物镜。 第一光盘的厚度t 1，第二光盘的厚度t 2和第三光盘的厚度t 3满足关系t 1 <= t 2 = NA 2> NA 3。 此外，用于第一光盘的第一光束作为会聚光束入射在物镜上，并且用于第二和第三光盘的第二和第三光束分别作为发散光束入射在物镜上。 假设当使用第一光盘时物镜的放大倍数为m 1，当使用第二光盘时物镜的倍率为m 2，并且当使用第一光盘时物镜的倍率为m 3 满足以下条件：m 1> 0，m 3

公开(公告)号：US20080165436A1

公开(公告)日：2008-07-10

申请号：US12046751

申请日：2008-03-12

申请人： Daisuke KOREEDA ,  Koichi MARUYAMA ,  Shuichi TAKEUCHI

发明人： Daisuke KOREEDA ,  Koichi MARUYAMA ,  Shuichi TAKEUCHI

IPC分类号： G02B3/02

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

摘要： There is provided an objective lens used for a plurality of types of optical discs having a front surface and a rear surface, each of which includes an inner region and an outer region. The outer region has a surface shape which suppresses a coma caused when a beam used for a first optical disc is incident thereon obliquely with respect to an optical axis of the objective lens. The inner region is configured such that, at a boundary position between the inner region and the outer region, the coma caused when a beam used for a second optical disc is incident on the inner region obliquely at a first angle with respect to the optical axis is less than the coma caused when the beam used for the second optical disc is incident on the outer region obliquely at the first angle with respect to the optical axis. Further, an inclination θ2A of the inner region and an inclination θ2B of the outer region of the rear surface satisfy a condition: −2.5

摘要翻译： 提供了一种用于具有前表面和后表面的多种类型的光盘的物镜，每个光盘包括内部区域和外部区域。 外部区域具有抑制当用于第一光盘的光束相对于物镜的光轴倾斜入射时引起的彗差的表面形状。 内部区域被构造成使得在内部区域和外部区域之间的边界位置处，当用于第二光盘的光束相对于光轴以第一角度倾斜地入射到内部区域时引起的彗形像 小于当用于第二光盘的光束相对于光轴以第一角度倾斜地入射到外部区域时引起的昏迷。 此外，后表面的外部区域的内部区域的倾斜度θ2A和倾斜度θ2B2满足条件：-2.5°2B < /SUB>-theta_2A<0.0。 。 。 （1）。

公开(公告)号：US20070297314A1

公开(公告)日：2007-12-27

申请号：US11765498

申请日：2007-06-20

申请人： Daisuke Koreeda ,  Shuichi Takeuchi

发明人： Daisuke Koreeda ,  Shuichi Takeuchi

IPC分类号： G11B7/00

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

摘要： There is provided an objective lens including a first optical member and a second optical member which are made of materials different from each other and are cemented together at a cementing surface. The cementing surface includes a first phase shift structure having a plurality of refractive surface zones concentrically formed about an optical axis of the objective lens. The first phase shift structure satisfies conditions (1) and (2): 0.85

公开(公告)号：US07023596B2

公开(公告)日：2006-04-04

申请号：US10356490

申请日：2003-02-03

申请人： Daisuke Koreeda

发明人： Daisuke Koreeda

IPC分类号： G02B26/08

CPC分类号： G02B26/125

摘要： A scanning optical system includes first and a second lens elements, at least one of which is a plastic lens element. Each surface of the plastic lens element is an aspherical surface that is configured such that a shape in a main scanning plane is defined as a function of a distance, in the main scanning direction, from a surface reference axis thereof, and that a curvature in an auxiliary scanning plane which is perpendicular to the main scanning plane is defined as another function of a distance, in the main scanning direction, from the surface reference axis. At least one of the two surfaces of the plastic lens element are arranged such that the surface reference axis thereof is decentered from an axis of the beam in the auxiliary scanning direction.

公开(公告)号：US06977781B2

公开(公告)日：2005-12-20

申请号：US10652033

申请日：2003-09-02

申请人： Shuichi Takeuchi ,  Daisuke Koreeda

发明人： Shuichi Takeuchi ,  Daisuke Koreeda

IPC分类号： B41J2/385 ,  G02B9/00 ,  G02B9/08 ,  G02B17/00 ,  G02B26/08 ,  G02B26/12 ,  G02B27/09 ,  G02B27/58 ,  G03G13/04 ,  H04N1/04

CPC分类号： G02B27/0988 ,  G02B26/124 ,  G02B27/58

摘要： A phase shift element having a central area (for transmitting part of an incident laser beam in the vicinity of the beam central axis) and a first area (giving the laser beam incident thereon a phase difference π relative to a beam passing through the central area) is placed on an optical path between a laser light source and a polygon mirror of a scanning optical system. The scanning optical system including such a phase shift element is installed in a printer. By the effect of the phase shift element, the intensity of side lobes (several rings of light accompanying the main beam) is prevented from exceeding a threshold value even when optical surfaces of an imaging optical system of the scanning optical system have certain microscopic undulations, by which black stripes occurring in halftone printing can be eliminated.

摘要翻译： 一种相移元件，其具有中心区域（用于传递入射激光束在光束中心轴附近的一部分）和第一区域（给予入射到其上的激光束相对于穿过中心区域的光束的相位差pi） ）放置在扫描光学系统的激光光源和多面镜之间的光路上。 包括这种相移元件的扫描光学系统安装在打印机中。 通过相移元件的作用，即使在扫描光学系统的成像光学系统的光学表面具有一定的微小波动的情况下，也能够防止旁瓣（伴随主光束的几个光环）的强度超过阈值， 可以消除在半色调印刷中出现的黑色条纹。

公开(公告)号：US06384968B1

公开(公告)日：2002-05-07

申请号：US09585646

申请日：2000-06-01

申请人： Eiichi Ito ,  Daisuke Koreeda ,  Satoru Tachihara

发明人： Eiichi Ito ,  Daisuke Koreeda ,  Satoru Tachihara

IPC分类号： G02B2106

CPC分类号： G02B7/20 ,  G02B21/0012 ,  G02B21/06 ,  G02B21/22

摘要： The optical system of the microscope includes a close-up optical system that faces an object, a pair of imaging optical systems that take object light rays passing through regions of the close-up optical system, and an illuminating optical system that guides illumination light emitted from a light source to illuminate the object. Each lens included in the close-up optical system has a semicircular shape in which one side is cut out. The close-up optical system is held in a first lens barrel, and the illuminating optical system is held in a second lens barrel. The second lens barrel is arranged in the cutout space of the close-up optical system inside the first lens barrel. A light shielding member is attached to the second lens barrel to prevent a leak of the illumination light through grooves formed on the second lens barrel.

公开(公告)号：US06275318B1

公开(公告)日：2001-08-14

申请号：US09339297

申请日：1999-06-24

申请人： Junji Kamikubo ,  Daisuke Koreeda

发明人： Junji Kamikubo ,  Daisuke Koreeda

IPC分类号： G02B2608

CPC分类号： G02B26/125

摘要： A linear imaging lens element for a scanning optical system in which light flux from a light source is formed as a linear image in the vicinity of a reflection surface of a light deflector includes a progressive power toric-aspherical surface being provided on either a surface facing the light source or on a surface facing the deflector. Cross-sectional configurations of the progressive power toric-aspherical surface, which are parallel with the plane including the optical axis and being perpendicular to the linear image, are made to be a circular arc, and the radius of curvature of each circular arc cross-sectional configuration is independently determined from the cross-sectional configuration lain on the plane which includes the optical axis and is parallel with the linear image.

摘要翻译： 一种用于扫描光学系统的线性成像透镜元件，其中来自光源的光束在光偏转器的反射表面附近形成为线性图像，包括渐进屈光力复曲面非球面，其设置在面向 光源或面向偏转器的表面上。 与包括光轴并且垂直于线性图像的平面平行的渐进屈光力复曲面非球面的横截面构造被制成圆弧，并且每个圆弧交叉的曲率半径 截面结构由包括光轴的平面上的横截面形状独立地确定并且与线性图像平行。

公开(公告)号：US08072694B2

公开(公告)日：2011-12-06

申请号：US12046751

申请日：2008-03-12

申请人： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

发明人： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC分类号： G02B3/08

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

摘要： There is provided an objective lens used for a plurality of types of optical discs having a front surface and a rear surface, each of which includes an inner region and an outer region. The outer region has a surface shape which suppresses a coma caused when a beam used for a first optical disc is incident thereon obliquely with respect to an optical axis of the objective lens. The inner region is configured such that, at a boundary position between the inner region and the outer region, the coma caused when a beam used for a second optical disc is incident on the inner region obliquely at a first angle with respect to the optical axis is less than the coma caused when the beam used for the second optical disc is incident on the outer region obliquely at the first angle with respect to the optical axis. Further, an inclination θ2A of the inner region and an inclination θ2B of the outer region of the rear surface satisfy a condition: −2.5

摘要翻译： 提供了一种用于具有前表面和后表面的多种类型的光盘的物镜，每个光盘包括内部区域和外部区域。 外部区域具有抑制当用于第一光盘的光束相对于物镜的光轴倾斜入射时引起的彗差的表面形状。 内部区域被构造成使得在内部区域和外部区域之间的边界位置处，当用于第二光盘的光束相对于光轴以第一角度倾斜地入射到内部区域时引起的彗形像 小于当用于第二光盘的光束相对于光轴以第一角度倾斜地入射到外部区域时引起的昏迷。 此外，内表面的倾斜度和外面的面积和外表面的外表面部分2B的条件是满足以下条件：-2.5 <＆amp; t; 2B-＆thetas; 2A <0.0。 。 。 （1）。

公开(公告)号：US08068401B2

公开(公告)日：2011-11-29

申请号：US12357462

申请日：2009-01-22

申请人： Daisuke Koreeda ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

发明人： Daisuke Koreeda ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

IPC分类号： G11B7/00

CPC分类号： G11B7/1374 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/13922 ,  G11B2007/0006

摘要： There is provided an objective optical system used for information recording/reproducing for three types of optical discs. The objective optical system includes an objective lens, and a diffraction structure formed on an optical surface. The diffraction structure includes a first area for contributing to converging the third light beam. The first area includes first and second steps defined by first and second optical path difference functions, respectively. The first step is configured such that diffraction orders at which diffraction efficiencies for the first, second and third light beams are maximized are 1st order, 0-th order and 0-th order, respectively. The first step satisfies a condition: −0.36×102

摘要翻译： 提供了用于三种类型的光盘的信息记录/再现的物镜光学系统。 物镜光学系统包括物镜和形成在光学表面上的衍射结构。 衍射结构包括用于有助于会聚第三光束的第一区域。 第一区域包括分别由第一和第二光程差函数限定的第一和第二步骤。 第一级被配置为使得第一，第二和第三光束的衍射效率最大化的衍射级分别为1级，0级和0级。 第一步满足条件：-0.36×102

公开(公告)号：US07872958B2

公开(公告)日：2011-01-18

申请号：US11752386

申请日：2007-05-23

申请人： Yoshiyuki Tashiro ,  Daisuke Koreeda ,  Koichi Maruyama

发明人： Yoshiyuki Tashiro ,  Daisuke Koreeda ,  Koichi Maruyama

IPC分类号： G11B7/135

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

摘要： In an optical information recording/reproducing device which executes information reading or writing on multiple types of optical discs having different data densities by selectively using first through third light beams having first through third wavelengths, respectively, at least one side of an optical element is provided with a step structure including a plurality of concentric refracting surfaces and steps between them. The steps include first steps each giving a first optical path length difference specified by a first optical path difference function, second steps each giving a second optical path length difference specified by a second optical path difference function, and special steps each giving an optical path length difference obtained by the sum or difference of/between the first and second optical path length differences. Annular zone widths between adjacent steps are set at 10 times the first wavelength or more.

摘要翻译： 在通过选择性地使用具有第一至第三波长的第一至第三光束执行信息读取或写入具有不同数据密度的多种类型的光盘的光学信息记录/再现装置中，分别提供光学元件的至少一侧 具有包括多个同心折射表面和它们之间的台阶的台阶结构。 这些步骤包括第一步骤，每个步骤给出由第一光程差函数指定的第一光程长度差，每个给出由第二光程差函数指定的第二光程长度差的第二步，以及各自给出光程长度 通过第一和第二光程长度差的和/之差获得的差。 相邻步骤之间的环带宽度设定为第一波长的10倍以上。