公开(公告)号：US07839752B2

公开(公告)日：2010-11-23

申请号：US11536004

申请日：2006-09-28

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

IPC: G11B7/135

CPC classification number: G11B7/1374 ,  G11B7/1275 ,  G11B7/13922 ,  G11B2007/0006

Abstract: There is provided an optical disc drive for recordation/reproduction for three types of optical discs by selectively using one of three types of light beams. The optical disc drive comprises an objective lens. The objective lens has a step structure which gives an optical path length difference to an incident beam at each step. When the third laser beam passes through the objective lens, the objective lens produces normal diffraction order light converging to a recording surface of the third optical disc and undesired diffraction order light converging to a point deviating from the recording surface of the third optical disc. A distance from a point to which the normal diffraction order light converges to a point to which the undesired diffraction order light converges is larger than or equal to twice a pull-in range of a focus error signal obtained when the third optical disc is used.

Abstract translation: 通过选择性地使用三种类型的光束之一，提供了用于三种类型的光盘的记录/再现的光盘驱动器。 光盘驱动器包括物镜。 物镜具有在每个步骤中给入射光束的光程长度差的阶梯结构。 当第三激光束通过物镜时，物镜产生会聚到第三光盘的记录表面的正常衍射级光，并且不期望的衍射级光会聚到偏离第三光盘的记录表面的点。 从法线衍射级光收敛到不期望的衍射级光会聚的点的距离大于或等于当使用第三光盘时获得的聚焦误差信号的拉入范围的两倍。

公开(公告)号：US20070014211A1

公开(公告)日：2007-01-18

申请号：US11456943

申请日：2006-07-12

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

IPC: G11B7/00

CPC classification number: G11B7/1374 ,  G11B2007/0006

Abstract: There is provided an objective lens used for three types of optical discs including by selectively using one of three types of light beams. At least one of surfaces of the objective lens is provided with a first region converging the third light beam on a recoding surface of the third optical disc. The first region has a step structure configured to have concentric refractive surface zones and to give an optical path length difference to an incident beam at each step formed between adjacent refractive surface zones. The step structure is configured such that the optical path length difference given by each step is substantially equal to an odd multiple of a wavelength of a first light beam, and a value of differentiation of an optical path difference function defining the step structure crosses zero in a height ranging from 30% to 70% of an effective diameter of the first region.

Abstract translation: 提供了一种用于三种类型的光盘的物镜，包括通过选择性地使用三种类型的光束之一。 物镜的至少一个表面设置有将第三光束会聚在第三光盘的记录表面上的第一区域。 第一区域具有构造成具有同心折射表面区域并且在相邻折射表面区域之间形成的每个台阶处的入射光束的光程长度差异的台阶结构。 台阶结构被配置为使得由每个步骤给出的光程长度差基本上等于第一光束的波长的奇数倍，并且限定步骤结构的光程差函数的微分值在零 高度为第一区域的有效直径的30％至70％。

公开(公告)号：US07019768B2

公开(公告)日：2006-03-28

申请号：US10721908

申请日：2003-11-26

Applicant: Shuichi Takeuchi ,  Daisuke Koreeda

Inventor： Shuichi Takeuchi ,  Daisuke Koreeda

IPC: G02B26/10 ,  B41J2/47

CPC classification number: G02B5/1895 ,  B41J2/471 ,  G02B5/1876 ,  G02B26/124

Abstract: There is provided a scanning optical system including a collimator lens being placed on an optical path between a light source and a deflecting system. At least one of a front surface and a rear surface of the collimator lens includes a central area through which part of the laser beam in the vicinity of a central axis of the laser beam passes, at least one first outer area having an effect on the laser beam so that the laser beam after passing through said at least one first outer area is given a first phase difference not including a phase difference of zero, and at least one second outer area having an effect on the laser beam so that the laser beam after passing through said at least one second outer area is given a second phase difference being different from the first phase difference and including a phase difference of zero.

Abstract translation: 提供了一种扫描光学系统，其包括放置在光源和偏转系统之间的光路上的准直透镜。 准直透镜的前表面和后表面中的至少一个包括激光束的中心轴附近的激光束的一部分通过的中心区域，至少一个第一外部区域， 激光束，使得在穿过所述至少一个第一外部区域之后的激光束被给予不包括零相位差的第一相位差和至少一个对激光束具有影响的第二外部区域，使得激光束 在通过所述至少一个第二外部区域之后，给予不同于第一相位差并包括零相位差的第二相位差。

公开(公告)号：US20050073937A1

公开(公告)日：2005-04-07

申请号：US10956132

申请日：2004-10-04

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC: G11B7/00 ,  G11B7/135

CPC classification number: G11B7/1392 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An objective lens used for recording data to and/or reproducing data from a plurality of types of optical discs having different thicknesses of cover layers. The objective lens satisfies a condition 0.02

Abstract translation: 用于从具有不同厚度的覆盖层的多种类型的光盘记录数据和/或再现数据的物镜。 物镜满足条件0.02

公开(公告)号：US20070297314A1

公开(公告)日：2007-12-27

申请号：US11765498

申请日：2007-06-20

Applicant: Daisuke Koreeda ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Shuichi Takeuchi

IPC: G11B7/00

CPC classification number: G11B7/1374 ,  G11B7/1353 ,  G11B2007/0006

Abstract: 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：US06977781B2

公开(公告)日：2005-12-20

申请号：US10652033

申请日：2003-09-02

Applicant: Shuichi Takeuchi ,  Daisuke Koreeda

Inventor： Shuichi Takeuchi ,  Daisuke Koreeda

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

CPC classification number: G02B27/0988 ,  G02B26/124 ,  G02B27/58

Abstract: 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.

Abstract translation: 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：US08072694B2

公开(公告)日：2011-12-06

申请号：US12046751

申请日：2008-03-12

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC: G02B3/08

CPC classification number: G11B7/1353 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

Abstract: 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

Abstract translation: 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

Applicant: Daisuke Koreeda ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

Inventor： Daisuke Koreeda ,  Shuichi Takeuchi ,  Yoshiyuki Tashiro

IPC: G11B7/00

CPC classification number: G11B7/1374 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/13922 ,  G11B2007/0006

Abstract: 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

Abstract translation: 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：US07778139B2

公开(公告)日：2010-08-17

申请号：US11873105

申请日：2007-10-16

Applicant: Daisuke Koreeda ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Shuichi Takeuchi

IPC: G11B7/135

CPC classification number: G11B7/13922 ,  G11B7/1374 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: There is provided an objective lens used for an optical information recording/reproducing device for recording information to and/or reproducing information from two types of optical discs, by selectively using one of two types of substantially collimated light beams including first and second light beams. When wavelengths of the first and second light beams are respectively represented by λ1 (nm) and λ2 (nm), λ1

Abstract translation: 提供了一种用于光信息记录/再现装置的物镜，用于通过选择性地使用包括第一和第二光束的两种类型的基本上准直的光束中的一种来从两种类型的光盘记录信息和/或再现信息。 当第一和第二光束的波长分别由λ1（nm）和λ2（nm）表示时，满足λ1<λ2。 物镜包括第一光学元件和由与第一光学元件不同的材料制成的第二光学元件。 第一和第二光学元件通过固井表面胶合。 此外，物镜被配置为满足以下条件：0.006 <{（nR·丁·2·n························（{ 2 3）+ 8×A fort 42}×f ud 1 3 + 2.29] <0.038。 （1）

公开(公告)号：US07742370B2

公开(公告)日：2010-06-22

申请号：US11419810

申请日：2006-05-23

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC: G11B7/00

CPC classification number: G11B7/1275 ,  G02B5/1876 ,  G02B5/1895 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

Abstract: An objective lens, for an optical information read/write device that performs read/write operations on each of a plurality of optical discs using a corresponding one of three laser beams having first, second, and third wavelengths λ1, λ2, and λ3 (nm) satisfying a relationship λ1

Abstract translation: 一种用于光信息读/写装置的物镜，用于使用具有第一，第二和第三波长λ1，λ2和λ3（nm）的三个激光束中的相应一个对多个光盘中的每一个进行读/写操作 ）分别包括具有多个环形折射表面区域的相移结构，物镜的至少一个表面被同心分开。 物镜由符合条件40＆nlE;＆ngr; d＆nlE; 80的阿贝数和材料制成。 相移结构在每对相邻的折射表面区域之间具有步骤，其给出与入射激光束的光程差，从而满足条件2N + 1.00 <| | Dgr; OPD /λ1| <2N + 1.30， 其中＆Dgr; OPD表示步长给出具有第一波长的激光束的光程差（nm），N表示非负整数。