公开(公告)号：US06873590B2

公开(公告)日：2005-03-29

申请号：US10087832

申请日：2002-03-05

Applicant: Shuichi Takeuchi ,  Koichi Maruyama

Inventor： Shuichi Takeuchi ,  Koichi Maruyama

IPC: G02B13/00 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

CPC classification number: G11B7/1353 ,  G11B7/1275 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

Abstract: Disclosed is an objective lens of an optical pick-up that converges light beams of two different wavelengths onto recording layers of optical discs of two different recording densities, respectively. The objective lens includes a refractive lens whose one surface is divided into a common area through which a light beam of a low NA, which is necessary and sufficient for an optical disc having low recording density, passes and a high NA exclusive area through which a light beam of a high NA, which is necessary only for an optical disc having high recording density, passes. A diffractive lens structure is formed in both the areas. The diffractive lens structure in the common area maximizes the diffraction efficiency of the first order and that in the high NA exclusive area maximizes the diffraction efficiency of the second or third order at the wavelength corresponding to the optical disc having high recording density.

Abstract translation: 公开了将两种不同波长的光束分别聚焦到两个不同记录密度的光盘的记录层上的光学拾取器的物镜。 物镜包括折射透镜，其折射透镜的一个表面被分成公共区域，对于具有低记录密度的光盘而言，必需且足够的低NA的光束通过该公共区域通过，并且高NA专用区域 高NA的光束仅对具有高记录密度的光盘是必需的。 在这两个区域中形成衍射透镜结构。 公共区域中的衍射透镜结构使第一级的衍射效率最大化，并且在高NA专用区域中的衍射效率使得对应于具有高记录密度的光盘的波长的第二或第三级的衍射效率最大化。

公开(公告)号：US06791594B2

公开(公告)日：2004-09-14

申请号：US09879161

申请日：2001-06-13

Applicant: Shuichi Takeuchi

Inventor： Shuichi Takeuchi

IPC: B41J2700

CPC classification number: B41J2/473 ,  G02B26/123 ,  G03F7/2053

Abstract: A laser imaging apparatus is provided with a light source unit that emits a laser beam including a first beam and a second beam. The central axes of the first beam and the second beams substantially coincide with each other. The first beam includes non-visible light, and the second beam includes visible light. The imaging apparatus further includes a modulating system that modulates the beam emitted by the light source unit, a deflecting system that deflects the beam modulated by the modulating system to scan within a predetermined angular range, and an imaging optical system that converges the deflected beam to form a scanning beam spot on a surface to be scanned.

Abstract translation: 激光成像装置设置有发射包括第一光束和第二光束的激光束的光源单元。 第一光束和第二光束的中心轴线基本上彼此重合。 第一光束包括不可见光，第二光束包括可见光。 成像装置还包括调制系统，其调制由光源单元发射的光束;偏转系统，其使由调制系统调制的光束偏转到预定的角度范围内进行扫描;以及成像光学系统，其将偏转的光束会聚到 在要扫描的表面上形成扫描光斑。

公开(公告)号：US06781764B1

公开(公告)日：2004-08-24

申请号：US10298611

申请日：2002-11-19

Applicant: Shuichi Takeuchi ,  Koichi Maruyama

Inventor： Shuichi Takeuchi ,  Koichi Maruyama

IPC: G02B2714

CPC classification number: G11B7/13925 ,  G02B27/0037 ,  G11B7/123 ,  G11B7/1275 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An optical system of an optical pick-up includes a light source portion that selectively emits a first laser beam (shorter wavelength) and a second laser beam (longer wavelength), and an objective lens for converging the first laser beam onto a first optical disc and for converging the second laser beam onto a second optical disc. The second optical disc has lower recording density and a thicker cover layer than the first optical disc. The divergence of the second laser beam incident on the objective lens is larger than that of the first laser beam, correcting one part of spherical aberration caused by a difference in thickness of the cover layer. A diffractive lens structure is formed on a surface of the refractive lens so that the residual part of the spherical aberration is corrected by switching the wavelength of the laser beam.

Abstract translation: 光拾取器的光学系统包括选择性地发射第一激光束（较短波长）和第二激光束（较长波长）的光源部分，以及用于将第一激光束会聚到第一光盘上的物镜 并且用于将第二激光束会聚到第二光盘上。 第二光盘具有比第一光盘低的记录密度和更厚的覆盖层。 入射到物镜上的第二激光束的发散度大于第一激光束的发散，校正由覆盖层的厚度差引起的一部分球面像差。 衍射透镜结构形成在折射透镜的表面上，从而通过切换激光束的波长来校正球面像差的剩余部分。

公开(公告)号：US06686948B2

公开(公告)日：2004-02-03

申请号：US10025551

申请日：2001-12-26

Applicant: Shuichi Takeuchi

Inventor： Shuichi Takeuchi

IPC: B41J1514

CPC classification number: G03F7/704 ,  G02B26/124 ,  G02B26/127

Abstract: A laser imaging apparatus is provided with a laser source, a relaying optical system, a deflector having at least one deflecting surface, an imaging optical system that converges the laser beam to form a beam spot on a surface to be scanned. An optical axis of the relaying optical system and an optical axis of the imaging optical system intersect at a deflection reference point which is located in the vicinity of a deflecting surface on which the laser beam is incident. The laser imaging apparatus further includes first and second adjusting systems that compensates for an inclination error and a positional error of the laser beam incident on the deflecting surface, respectively. The first and second adjusting systems are provided in the relaying optical system.

Abstract translation: 激光成像装置设置有激光源，中继光学系统，具有至少一个偏转表面的偏转器，会聚激光束以在待扫描表面上形成束斑的成像光学系统。 中继光学系统的光轴和成像光学系统的光轴在位于激光束入射的偏转表面附近的偏转参考点相交。 激光成像装置还包括分别补偿入射在偏转表面上的激光束的倾斜误差和位置误差的第一和第二调节系统。 第一和第二调节系统设置在中继光学系统中。

公开(公告)号：US06555808B2

公开(公告)日：2003-04-29

申请号：US09906242

申请日：2001-07-16

Applicant: Shuichi Takeuchi ,  Kouichi Ohno

Inventor： Shuichi Takeuchi ,  Kouichi Ohno

IPC: G01D534

CPC classification number: G01D5/36

Abstract: A relative rotational angle of a rotary body is measured with respect to a reference angle. First openings are arranged about the circumference of a disk, which rotates integrally with the rotary body, at predetermined pitches. A first detecting element detects the first openings and generates a first binary code. The relative rotational angle of the rotary body is computed in accordance with the first binary code. A second detecting element detects the second openings and generates a second binary code. The reference angle of the rotary body is computed and reset in accordance with the second binary code. Third openings are concentrical with the first and second openings. A third detecting element detects the third openings and generates a third binary code. The reference angle is determined based on the combination of the first and third binary codes.

公开(公告)号：US06515955B2

公开(公告)日：2003-02-04

申请号：US09833612

申请日：2001-04-13

Applicant: Shuichi Takeuchi

Inventor： Shuichi Takeuchi

IPC: G11B700

CPC classification number: G11B7/13922 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/13727

Abstract: Disclosed is an objective optical system for an optical pick-up that converges a light beam whose wavelength is shorter than F-line onto an information layer of an optical disc. The objective optical system consists of a refractive lens on which the diffractive lens structure is formed and satisfies the following condition (1); 1/(&ngr;3×&lgr;×10−6)

Abstract translation: 公开了一种用于将波长短于F线的光束会聚在光盘的信息层上的用于光学拾取器的物镜光学系统。 物镜光学系统由衍射透镜结构形成的折射透镜构成，满足以下条件（1），其中nu为阿贝数，lamb为工作波长（单位：nm），至少一个表面 折射透镜形成为随着与光轴的高度变大，曲率半径增加的非球面。 衍射透镜结构具有多个同心圆环状的步骤，以校正由折射透镜引起的色像差。

公开(公告)号：US06330522B1

公开(公告)日：2001-12-11

申请号：US09397177

申请日：1999-09-16

Applicant: Shuichi Takeuchi

Inventor： Shuichi Takeuchi

IPC: G01D534

CPC classification number: G01D5/347

Abstract: A rotor is fixed to a steering shaft to rotate with the steering shaft, and outer and inner slits are formed along different circles on the rotor. Outer and inner sensors, which detect the presence or absence of the slits, generate reflective codes and are located next to the rotor. Stored pattern data that matches the reflective code is used to determine the rotational angle. Alternatively, if the pattern data does not match the reflective codes, the rotational angle of the steering shaft is computed on the basis of the reflective codes.

Abstract translation: 转子固定在转向轴上以与转向轴一起旋转，外转子和内切口沿转子上的不同圆形成。 检测狭缝的存在或不存在的外部和内部传感器产生反射代码并且位于转子旁边。 与反射码匹配的存储图案数据用于确定旋转角度。 或者，如果图案数据与反射代码不匹配，则基于反射代码来计算转向轴的旋转角度。

公开(公告)号：US06222661B1

公开(公告)日：2001-04-24

申请号：US09484445

申请日：2000-01-18

Applicant: Shuichi Takeuchi ,  Junji Kamikubo

Inventor： Shuichi Takeuchi ,  Junji Kamikubo

IPC: G02B2608

CPC classification number: G02B27/4211 ,  G02B26/125 ,  G02B27/0031 ,  G02B27/0037 ,  G02B27/4227 ,  G02B27/4261

Abstract: A scanning optical system is provided with a semiconductor laser, a polygonal mirror, which deflects a beam emitted from the semiconductor laser, an f&thgr; lens for converging the beam deflected by the deflector onto a surface to be scanned, and a diffractive surface between the polygonal mirror and the surface to be scanned. The diffractive surface compensates for a lateral chromatic aberration caused by the f&thgr; lens. Further, the diffraction efficiency of the diffractive surface on an optical axis of the f&thgr; lens is smaller than that of a peripheral portion to cancel a power variation due to a variation of the light quantity transmitted through the scanning lens.

Abstract translation: 扫描光学系统设置有半导体激光器，多角镜，其偏转从半导体激光器发射的光束，用于会聚由偏转器偏转的光束到待扫描的表面上的光束透镜，以及多边形之间的衍射面 镜子和待扫描的表面。 衍射面弥补了由透镜引起的横向色差。 此外，衍射面在透镜的光轴上的衍射效率小于外围部分的衍射面的衍射效率，以消除透过扫描透镜的光量的变化引起的功率变化。

公开(公告)号：US08514686B2

公开(公告)日：2013-08-20

申请号：US13050146

申请日：2011-03-17

Applicant: Daisuke Koreeda ,  Shuichi Takeuchi

Inventor： Daisuke Koreeda ,  Shuichi Takeuchi

IPC: G11B7/00

CPC classification number: G11B7/1275 ,  G02B5/1895 ,  G11B7/1353 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

Abstract: An objective optical system for information recording/reproducing, at least one of optical surfaces of the objective optical system comprising a diffraction surface including a first region contributing to converging first, second and third beams and including a diffraction structure formed such that use diffraction orders for the first, second and third beams are 1st-orders and a condition 0.03

Abstract translation: 一种用于信息记录/再现的物镜光学系统，所述物镜光学系统的光学表面中的至少一个包括衍射表面，所述衍射表面包括有助于会聚第一，第二和第三光束的第一区域，并且包括衍射结构， 第一，第二和第三光束为1阶，满足条件0.03 <（λB11-λ1）/λ1<0.40; 第二区域有助于仅会聚第一和第二光束，并且包括形成为使得衍射级数为1级并且条件为-0.35 <（λB12-λB11）/λ1<0.35的衍射结构; 以及第三区域，仅有助于仅会聚第一光束，并且包括形成为使得第一光束的使用衍射级为奇数阶和条件的衍射结构：-0.23

公开(公告)号：US08456979B2

公开(公告)日：2013-06-04

申请号：US13250135

申请日：2011-09-30

Applicant: Satoshi Inoue ,  Shuichi Takeuchi

Inventor： Satoshi Inoue ,  Shuichi Takeuchi

IPC: G11B7/135

CPC classification number: G11B7/13922 ,  G11B7/0956 ,  G11B7/1374

Abstract: An optical information recording/reproducing apparatus for an optical disc using a light beam having a wavelength of λ including: an objective lens that converges the light beam onto a recording surface of the optical disc and satisfies a condition: 0.48

Abstract translation: 一种使用波长为λ的光束的光盘的光学信息记录/再现装置，包括：将光束会聚到光盘的记录表面上并满足以下条件的物镜：0.48