公开(公告)号：US07830772B2

公开(公告)日：2010-11-09

申请号：US12194081

申请日：2008-08-19

Applicant: Yoshiyuki Tashiro ,  Daisuke Koreeda ,  Shuichi Takeuchi

Inventor： Yoshiyuki Tashiro ,  Daisuke Koreeda ,  Shuichi Takeuchi

IPC: G11B7/00

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

Abstract: There is provided an objective optical system for an optical information recording/reproducing device. The objective optical system includes an optical element having an annular zone structure on at least one surface. The annular zone structure includes annular zones configured to have at least one step formed, at a boundary between adjacent ones of the annular zones, to extend in a direction of an optical axis. The at least one step is provided to cause a predetermined optical path length difference between a light beam passing through an outside of the boundary and a light beam passing through an inside of the boundary. The predetermined optical path length difference given to a first light beam by the at least one step is approximately equal to an odd multiple of a first wavelength λa. Abbe number of material of the optical element satisfies a condition of 15

Abstract translation: 提供了一种用于光信息记录/再现装置的物镜光学系统。 物镜光学系统包括在至少一个表面上具有环形区域结构的光学元件。 环形区域结构包括环形区域，其被配置为具有在相邻环形区域之间的边界处形成的沿着光轴方向延伸的至少一个台阶。 提供至少一个步骤以使通过边界外侧的光束和通过边界内部的光束之间的预定光程长度差。 通过至少一个步骤给予第一光束的预定光程长度差近似等于第一波长λa的奇数倍。 光学元件的阿贝数量满足15 <＆gt; d <35的条件。

公开(公告)号：US07821906B2

公开(公告)日：2010-10-26

申请号：US11155477

申请日：2005-06-20

Applicant: Daisuke Koreeda ,  Koichi Maruyama

Inventor： Daisuke Koreeda ,  Koichi Maruyama

IPC: G11B7/135

CPC classification number: G11B7/1367 ,  G11B7/1275 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/13922 ,  G11B2007/0006

Abstract: An objective lens for an optical pick-up which is used to record data to and/or to reproduce data from at least three types of optical discs by selectively using one of at least three light beams having different wavelengths is provided. When thicknesses of a first, second and optical discs are represented by t1, t2 and t3, respectively, a relationship t1≦t2 NA3 is satisfied. The first, second and third light beams are incident on the objective lens as substantially collimated light beams, respectively. In this configuration, at least one of surfaces of the objective lens includes a first area for attaining the numerical aperture required for recording data to and/or reproducing data from the third optical disc, and a second area located outside the first area. The first area includes an inner area including an optical axis of the objective lens, and an outer area located outside the inner area. The outer area is configured to converge the third light beam on a data recording layer of the third optical disc with an amount of an aberration being substantially zero. The objective lens satisfies a condition: 0.75

Abstract translation: 提供了一种用于通过选择性地使用具有不同波长的至少三个光束中的至少三种类型的光盘来记录数据和/或从至少三种类型的光盘再现数据的用于光学拾取器的物镜。 当第一，第二和光盘的厚度分别由t1，t2和t3表示时，满足关系t1＆nlE; t2 NA3。 第一，第二和第三光束分别作为基本准直的光束入射在物镜上。 在该配置中，物镜的至少一个表面包括用于获得从第三光盘记录数据和/或再现数据所需的数值孔的第一区域和位于第一区域外的第二区域。 第一区域包括包括物镜的光轴的内部区域和位于内部区域外部的外部区域。 外部区域被配置为将第三光束会聚在第三光盘的数据记录层上，其像差量基本为零。 物镜满足条件：0.75

公开(公告)号：US07813252B2

公开(公告)日：2010-10-12

申请号：US12195639

申请日：2008-08-21

Applicant: Daisuke Koreeda ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Shuichi Takeuchi

IPC: G11B7/00

CPC classification number: G11B7/13922 ,  G11B7/1353 ,  G11B7/1374 ,  G11B7/1376 ,  G11B2007/0006

Abstract: There is provided an optical pick-up including first to third light sources respectively emitting first to third light beams, a first coupling lens, and an objective lens formed to converge each of the first, second and third light beams onto the first, second and third optical discs, respectively. The objective lens has a step structure including a plurality of concentrically formed refractive surface zones divided by steps, the step structure having a function of giving, at each step, an optical path length difference of approximately 2λ1 to the first light beam. The first coupling lens causes the first light beam to be incident on the objective lens as a converging beam. The objective lens is positioned to satisfy a condition: −0.35

Abstract translation: 提供了包括分别发射第一至第三光束的第一至第三光源的光学拾取器，第一耦合透镜和物镜，其将第一，第二和第三光束中的每一个会聚到第一，第二和第二光束上， 第三光盘。 物镜具有阶梯结构，该阶梯结构包括多个同步形成的折射表面区域，其阶梯结构具有在每个阶段给出与第一光束大约2λ1的光程长度差异的功能。 第一耦合透镜使第一光束作为会聚光束入射到物镜上。 物镜被定位成满足条件：-0.35

公开(公告)号：US07738345B2

公开(公告)日：2010-06-15

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：US07433291B2

公开(公告)日：2008-10-07

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

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：US07414948B2

公开(公告)日：2008-08-19

申请号：US10900250

申请日：2004-07-28

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi

IPC: G11B7/00

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，后表面的外部区域的内部区域的倾斜度θ2A和斜面θ2B2满足以下条件：<βin-line-formula description = “In-line Formulas”end =“lead”？> - 2.5 （1）<？in-line-formula description =“In-line Formulas”end =“tail”？>

公开(公告)号：US07224662B2

公开(公告)日：2007-05-29

申请号：US10430212

申请日：2003-05-07

Applicant: Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

Inventor： Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

IPC: G11B7/135

CPC classification number: G11B7/139 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An objective lens for an optical pickup is configured such that, when a light beam having a wavelength corresponding to the optical disc requiring the higher NA is converged on the optical disc requiring the higher NA at the higher NA, the phase of light flux passed through the peripheral area is substantially the same as that passed through the central area. When a light beam having a wavelength corresponding to the optical disc requiring the lower NA is converged on the optical disc requiring the lower NA at the lower NA, the phase of light flux passed through a first annular region included in the peripheral area is different from that passed through the central area, and the phase of light flux passed through a second annular region, which is outside the first region, is substantially the same as that passed through the central area.

Abstract translation: 用于光学拾取器的物镜被配置为使得当具有对应于需要较高NA的光盘的波长的光束会聚在需要较高NA的较高NA的光盘上时，光通量的相位通过 周边区域与通过中心区域的区域基本相同。 当具有对应于需要较低NA的光盘的波长的光束会聚在需要较低NA的较低NA的光盘上时，通过包括在周边区域中的第一环形区域的光通量的相位不同于 并且通过第一区域外的第二环状区域的光束的相位与穿过中央区域的光通量大致相同。

公开(公告)号：US06982838B2

公开(公告)日：2006-01-03

申请号：US10859140

申请日：2004-06-03

Applicant: Koichi Maruyama ,  Daisuke Koreeda

Inventor： Koichi Maruyama ,  Daisuke Koreeda

IPC: G02B3/02 ,  G02B13/18 ,  G02B3/08 ,  G11B7/00 ,  G11B7/135

CPC classification number: G11B7/1374

Abstract: There is provided an objective lens used for at least three types of optical discs when thicknesses are respectively represented by t1, t2 and t3, t1 as 0.6 mm, t2 is 0.6 mm and t3 is 1.2 mm. When numerical apertures for the first, second and third optical discs are respectively represented by NA1, NA2 and NA3, a relationship NA1>NA2>NA3 is satisfied. When the first and second optical discs are used, collimated light beams are incident on the objective lens. When the third optical disc is used, a diverging beam is incident on the objective lens. The following conditions are satisfied: −0.02

Abstract translation: 当厚度分别由t 1，t 2和t 3，t 1表示为0.6mm，t 2为0.6mm，t 3为1.2mm时，提供用于至少三种类型的光盘的物镜。 当第一，第二和第三光盘的数值孔径分别由NA 1，NA 2和NA 3表示时，满足关系NA 1> NA 2> NA 3。 当使用第一和第二光盘时，准直光束入射到物镜上。 当使用第三光盘时，发散光束入射到物镜上。 满足以下条件：-0.02

公开(公告)号：US20050152259A1

公开(公告)日：2005-07-14

申请号：US11033741

申请日：2005-01-13

Applicant: Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

Inventor： Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

IPC: G02B13/00 ,  G02B3/08 ,  G02B13/18 ,  G11B7/00 ,  G11B7/135

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

Abstract: An objective lens for recording data to and/or reproducing data from first and second optical discs. The objective lens is provided with at least one surface including a plurality of annular zones divided by steps. The steps has functions of phase shifting a wavefront of light passing through the plurality of annular zones so that a beam spot formed at a converging point of an average wavefront of the wavefront phase shifted by the steps is used for the first and second optical discs. The plurality of annular zones of the at least one surface includes at least one annular zone structure which includes first and second annular zone groups, each of which has at least three steps for phase shifting the wavefront in a first direction, and a first return step which is a step formed at a boundary between the first and second annular zone groups. The first return step phase shifts the wavefront in a second direction opposite to the first direction. An absolute value |Δψ1| of a phase shifting amount of the first light beam given by the first return step satisfies a condition: 6π

Abstract translation: 用于将数据记录到第一和第二光盘和/或从第一和第二光盘再现数据的物镜。 物镜设置有至少一个表面，其包括被台阶分割的多个环形区域。 这些步骤具有使通过多个环形区域的光的波前相移的功能，使得在第一和第二光盘处使用由步骤偏移的波前相位的平均波前的聚光点处形成的束斑。 所述至少一个表面的多个环形区域包括至少一个环形区域结构，其包括第一和第二环形区域组，每个环形区域组具有至少三个步骤，用于沿第一方向相移所述波阵面;以及第一返回步骤 其是在第一和第二环形区域组之间的边界处形成的台阶。 第一返回阶段相对于与第一方向相反的第二方向偏移波前。 绝对值| Deltapsi1 | 由第一返回步骤给出的第一光束的相移量满足条件：6pi <| Deltapsi1 | <14pi。 。 。 （1）。 绝对值| Deltapsi1 | 由第一返回步骤给出的第一光束的相移量的值小于由第一环形区域组给出的相移量之和的绝对值和相移量之和的绝对值中的较大值 由第二个环形区组给出。

公开(公告)号：US20050057811A1

公开(公告)日：2005-03-17

申请号：US10937290

申请日：2004-09-10

Applicant: Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi ,  Naohito Sasaki

Inventor： Daisuke Koreeda ,  Koichi Maruyama ,  Shuichi Takeuchi ,  Naohito Sasaki

IPC: G02B1/11 ,  G02B13/18 ,  G11B7/135 ,  G11B7/00 ,  G02B1/10 ,  G02B21/02

CPC classification number: G11B7/1374 ,  G02B1/11 ,  G02B13/18

Abstract: An objective lens on which a beam having parallel light fluxes is incident includes a single element lens and a reflection suppressing coating formed on at least one surface of the single element lens. The reflection suppressing coating is formed such that the reflectivity across a radius of the objective lens exhibits a local maximal value, and the reflection suppressing coating is formed to achieve the following condition: 0.6

Abstract translation: 入射了具有平行光束的光束的物镜包括形成在单一元件透镜的至少一个表面上的单个元件透镜和反射抑制涂层。 形成反射抑制涂层，使得物镜半径的反射率呈现局部最大值，形成反射抑制涂层以达到以下条件：0.6