公开(公告)号：US06922289B2

公开(公告)日：2005-07-26

申请号：US10438135

申请日：2003-05-14

Applicant: Junji Hashimura ,  Kyu Takada

Inventor： Junji Hashimura ,  Kyu Takada

IPC: G02B13/00 ,  G02B3/04 ,  G02B13/18 ,  G11B7/135 ,  G02B21/02

CPC classification number: G11B7/1374 ,  G02B3/04 ,  G11B7/13922

Abstract: An objective lens system for optical pickups reading and/or writing information by condensing a luminous flux from a light source onto an optical information recording medium, consists of, a single lens having, from a light source side, a first surface convex to the light source side and a second surface convex to an image side. A medium of the single lens is a homogeneous medium. At least one of the two surfaces is aspherical. The system satisfies the predetermined conditions.

Abstract translation: 用于光学拾取器的物镜系统通过将来自光源的光通量聚光到光学信息记录介质上来读取和/或写入信息，包括从光源侧具有凸起到光的第一表面的单透镜 源极侧和向图像侧凸出的第二表面。 单透镜的介质是均匀的介质。 两个表面中的至少一个是非球面的。 该系统满足预定条件。

公开(公告)号：US20050063282A1

公开(公告)日：2005-03-24

申请号：US10942460

申请日：2004-09-16

Applicant: Kyu Takada ,  Junji Hashimura ,  Yuichiro Ori ,  Toru Kimura

Inventor： Kyu Takada ,  Junji Hashimura ,  Yuichiro Ori ,  Toru Kimura

IPC: G02B5/18 ,  G11B7/00 ,  G11B7/135 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1392

CPC classification number: G11B7/1353 ,  G02B3/08 ,  G02B13/003 ,  G02B13/0045 ,  G02B13/0055 ,  G02B13/0065 ,  G11B7/1367 ,  G11B7/13922 ,  G11B7/13925 ,  G11B2007/0006

Abstract: An optical pickup apparatus includes a diffractive optical element, and an objective lens that focuses a light beam of a first wavelength λ1, a light beam of a second wavelength λ2 and a light beam of a third wavelength λ3 on a first recording medium, a second recording medium, and a third recording medium, respectively, the wavelengths λ1, λ2, and λ3 being different from each other. The diffractive optical element includes a first diffractive surface that neither diffracts the light beam of the first wavelength λ1 nor the light beam of the third wavelength λ3 but diffracts the light beam of the second wavelength λ2, and a second diffractive surface that neither diffracts the light beam of the first wavelength λ1 nor the light beam of the second wavelength λ2 but diffracts the light beam of the third wavelength λ3, and each of the first and second diffractive surfaces satisfies the following condition inequality: Λ/λ≧8 wherein A represents the minimum pitch in the case that the width which generates a phase difference of one wavelength when the closest wavefronts resulting from adjacent steps in each of the diffractive surfaces are linked with each other is defined as one pitch, and λ represents the wavelength of the diffracted light.

Abstract translation: 光拾取装置包括衍射光学元件和将第一波长λ1的光束，第二波长λ2的光束和第三波长λ3的光束的光束聚焦在第一记录介质上的物镜，第二 记录介质和第三记录介质，波长λ1，λ2和λ3彼此不同。 衍射光学元件包括：第一衍射面，其既不衍射第一波长λ1的光束也不衍射第三波长λ3的光束，但衍射第二波长λ2的光束;以及第二衍射面，其不衍射光 第一波长λ1的光束和第二波长λ2的光束，但衍射第三波长λ3的光束，并且第一和第二衍射面中的每一个满足以下条件不等式：λλ= 8其中A表示 当在每个衍射表面中由相邻步骤产生的最接近的波前相互连接时产生一个波长的相位差的宽度的情况下的最小间距被定义为一个间距，并且λ表示衍射的波长 光。

公开(公告)号：US06785029B2

公开(公告)日：2004-08-31

申请号：US09865625

申请日：2001-05-29

Applicant: Kyu Takada ,  Takuji Hatano

Inventor： Kyu Takada ,  Takuji Hatano

IPC: G02B2608

CPC classification number: G02B5/09 ,  G02B5/0833 ,  G02B26/123 ,  G02B27/28

Abstract: An optical scanner having a simple structure in which the light quantities of a plurality of light beams are not varied by differences in polarization direction among the light beams. The optical scanner scans a surface by means of a plurality of light beams in which the polarization direction of at least one of the light beams is different from the polarization directions of the other light beams. An optical element having a surface with a reflectance for s-polarized light and a reflectance for p-polarized light that are substantially the same at a given incident angle is provided in the optical paths of the light beams.

Abstract translation: 一种具有简单结构的光学扫描器，其中多个光束的光量不会因光束中的偏振方向的差异而变化。 光扫描仪通过多个光束扫描表面，其中至少一个光束的偏振方向与其他光束的偏振方向不同。 在光束的光路中设置有具有对于s偏振光具有反射率的表面和在给定入射角基本上相同的p偏振光的反射率的光学元件。

公开(公告)号：US06707588B2

公开(公告)日：2004-03-16

申请号：US09818304

申请日：2001-03-27

Applicant: Kyu Takada

Inventor： Kyu Takada

IPC: G02F103

CPC classification number: G02B6/1225 ,  B82Y20/00

Abstract: A photonic crystal device including a method of forming the photonic crystal device is provided wherein the photonic crystal device comprises a first medium having a thickness and periodically defining a plurality of periodically spaced concave portions. The concave portions having a depth less than the thickness of the first medium. A second medium fills the concave portions. One layer of the device, including both the first and second medium, acts as an optical waveguide layer, or photonic crystal. Another layer is at least partially formed from the first medium, such that the first and second layers share a common medium. A method of forming the photonic crystal device including the steps of applying a resist layer to a first medium, removing portions of the resist layer and corresponding portions of the first medium to form vacancies, and filling the vacancies with a second medium.

Abstract translation: 提供了包括形成光子晶体器件的方法的光子晶体器件，其中光子晶体器件包括具有厚度并周期性地限定多个周期性间隔的凹部的第一介质。 凹部的深度小于第一介质的厚度。 第二介质填充凹部。 包括第一和第二介质的器件的一层用作光波导层或光子晶体。 另一层至少部分地由第一介质形成，使得第一层和第二层共享公共介质。 一种形成光子晶体器件的方法，包括以下步骤：将抗蚀剂层施加到第一介质，去除抗蚀剂层的部分和第一介质的相应部分以形成空位，并用第二介质填充空位。

公开(公告)号：US06628443B1

公开(公告)日：2003-09-30

申请号：US09597423

申请日：2000-06-19

Applicant: Kyu Takada ,  Nozomu Inoue ,  Takeshi Sowa

Inventor： Kyu Takada ,  Nozomu Inoue ,  Takeshi Sowa

IPC: G02B2608

CPC classification number: G02B26/123 ,  G02B26/124

Abstract: A multi-beam optical scanner includes shaping optics (42) by which a plurality of light beams issued from light emitting portions (411, 412) are shaped to be substantially parallel in a primary scanning direction, a deflector having reflecting faces (45) that reflect and deflect the plurality of light beams and scanning optics (46) by which the plurality of light beams reflected and deflected by the reflecting faces (45) are scanned across a plane (48) to be scanned as a plurality of adjacent beam spots, wherein the distance from the rear principal plane of the shaping optics (42) to the front principal plane of the scanning optics 46 is expressed by f1+f2, where f1 and f2 are the focal lengths of the shaping optics (42) and the scanning optics (46), respectively, in the primary scanning direction.

Abstract translation: 多光束光学扫描器包括成形光学器件（42），由发光部分（411,412）发出的多个光束被成形为在主扫描方向上基本平行，偏转器具有反射面（45），该反射面 反射和偏转多个光束和扫描光学器件（46），由反射面（45）反射和偏转的多个光束通过扫描光学元件扫描，以作为多个相邻光束点被扫描的平面（48） 其中从成形光学器件（42）的后主平面到扫描光学器件46的前主平面的距离由f1 + f2表示，其中f1和f2是成形光学器件（42）的焦距和扫描 光学元件（46）分别在主扫描方向上。

公开(公告)号：US5781323A

公开(公告)日：1998-07-14

申请号：US744746

申请日：1996-11-06

Applicant: Kyu Takada ,  Nozomu Inoue ,  Takashi Hama ,  Yujiro Nomura

Inventor： Kyu Takada ,  Nozomu Inoue ,  Takashi Hama ,  Yujiro Nomura

IPC: B41J2/44 ,  G02B5/09 ,  G02B26/10 ,  G02B26/12 ,  G03G15/04 ,  G02B26/08

CPC classification number: G02B5/09 ,  G02B26/125

Abstract: An optical scanner for use in laser beam printers and the like which is particularly satisfactory in imaging characteristics. A light beam from a semiconductor laser passes through a collimator lens, an aperture diaphragm and a cylindrical lens. The beam is then deflected by a rotating lens mirror and subjected to the focusing action of an imaging lens so that it is focused to form a beam spot, which scans over a scan surface as the beam is deflected. The imaging lens has aspheric surfaces in the main-scanning cross section and is designed so that the rate of change in its curvature and other relevant parameters satisfy a predetermined equation so as to lie within a predetermined range.

Abstract translation: 用于激光束打印机等的光学扫描仪，其特别令人满意的成像特性。 来自半导体激光器的光束通过准直透镜，孔径光阑和柱面透镜。 然后光束被旋转透镜反射镜偏转并经受成像透镜的聚焦作用，使得其被聚焦以形成光束点，当光束被偏转时扫描光束点在扫描表面上扫描。 成像透镜在主扫描横截面中具有非球面，并且被设计成其曲率变化率和其它相关参数满足预定方程以便处于预定范围内。

公开(公告)号：US5751463A

公开(公告)日：1998-05-12

申请号：US837750

申请日：1997-04-22

Applicant: Nozomu Inoue ,  Takashi Hama ,  Yujiro Nomura ,  Kyu Takada

Inventor： Nozomu Inoue ,  Takashi Hama ,  Yujiro Nomura ,  Kyu Takada

IPC: B41J2/44 ,  G02B7/00 ,  G02B26/10 ,  G02B26/12 ,  G03G15/04 ,  G02B26/08

CPC classification number: G02B7/008 ,  G02B26/12

Abstract: An optical scanner that has a simple construction and which yet exhibits satisfactory imaging performance under varying temperature conditions. Of the two orthogonal scanning cross sections of scanning optics (i.e., the main and sub-scanning cross sections), the one that involves the greater movement of the image plane due to the temperature-dependent changes in optical characteristics (e.g. the variation in the operating wavelength of a light source, the index variation of a lens material and the thermal expansion of a lens itself) is adapted to be the same as the other cross section that involves the greater movement of the image plane due to the change in the distance from the light source to a collimator lens. If necessary, additional correction is effected in such a way that the scanning cross section that involves the greater overall movement of the image plane after correction for temperature changes is adapted to be different from the cross section that involves the greater amount of optical field curvature.

公开(公告)号：US20130027692A1

公开(公告)日：2013-01-31

申请号：US13640709

申请日：2011-04-05

Applicant: Kazuyuki Ogura ,  Masahiro Okitsu ,  Youichi Ogawa ,  Kyu Takada

Inventor： Kazuyuki Ogura ,  Masahiro Okitsu ,  Youichi Ogawa ,  Kyu Takada

IPC: G01B11/14

CPC classification number: G01M11/0221 ,  G01M11/025

Abstract: In an eccentricity measuring method according to the present invention, a first position of a light source image formed by reflection at one optical surface is measured (S2), a predetermined second position related to another optical surface is measured (S3), and a relative eccentricity between both optical surfaces is calculated based on the first and second positions (S5). Therefore, the eccentricity measuring method enables measurement of eccentricity by a same measurement optical system regardless of a radius of curvature of an optical surface of an optical element.

Abstract translation: 在根据本发明的偏心测量方法中，测量在一个光学表面上由反射形成的光源图像的第一位置（S2），测量与另一个光学表面相关的预定的第二位置（S3），并且相对 基于第一和第二位置计算两个光学表面之间的偏心度（S5）。 因此，偏心测量方法能够通过相同的测量光学系统来测量偏心度，而与光学元件的光学表面的曲率半径无关。

公开(公告)号：US20110085433A1

公开(公告)日：2011-04-14

申请号：US12999856

申请日：2009-06-01

Applicant: Kyu Takada ,  Kiyono Tateyama ,  Kentarou Nakamura

Inventor： Kyu Takada ,  Kiyono Tateyama ,  Kentarou Nakamura

IPC: G11B7/00

CPC classification number: G11B7/1353 ,  G02B3/04 ,  G02B5/1895 ,  G11B7/1374 ,  G11B7/13922

Abstract: Provided are an optical pickup apparatus and an objective lens which can record and/or reproduce information for discs with different recording densities and can realize simplification of the structure of themselves and reducing cost. When the expression (1) is satisfied, step differences of a step structure can be further reduced than those in the case that d1=λ1(n−1) holds, and fine grooves corresponding to a steps structure, formed on an optical-surface transfer surface of a mold for molding the objective lens become shallow, to be easily processed. In addition, the moldability is enhanced because the material of the objective lens easily enters the inner portion of the grooves. Further, a fluctuation of a diffraction efficiency caused when wavelength of a light flux changes or temperature changes is reduced so that information can be recorded and/or reduced stably.

Abstract translation: 提供一种能够记录和/或再现具有不同记录密度的盘的信息的光学拾取装置和物镜，并且可以实现其自身的结构的简化并降低成本。 当满足表达式（1）时，阶梯结构的步长差可以比在d1 =λ1（n-1）成立的情况下的阶梯差更进一步降低，并且形成在光学表面上的与阶梯结构相对应的细槽 用于模制物镜的模具的转印表面变浅，易于加工。 此外，由于物镜的材料容易进入槽的内部，所以成型性得到提高。 此外，当光束波长变化或温度变化时引起的衍射效率的波动减小，从而可以稳定地记录和/或降低信息。

公开(公告)号：US06853760B2

公开(公告)日：2005-02-08

申请号：US09765229

申请日：2001-01-18

Applicant: Koujirou Sekine ,  Mitsuru Yokoyama ,  Miyuki Teramoto ,  Kyu Takada ,  Takuji Hatano ,  Shinji Maruyama ,  Tsuyoshi Iwamoto

Inventor： Koujirou Sekine ,  Mitsuru Yokoyama ,  Miyuki Teramoto ,  Kyu Takada ,  Takuji Hatano ,  Shinji Maruyama ,  Tsuyoshi Iwamoto

IPC: G02B5/18 ,  G02B6/12 ,  G02B6/122 ,  G02B6/42 ,  G02F1/01 ,  G02F1/125 ,  G02F1/13 ,  G02F1/295 ,  G02F1/313 ,  G02F1/335 ,  G02B6/36

CPC classification number: G02F1/125 ,  B82Y20/00 ,  G02B6/1225 ,  G02B6/42 ,  G02B2006/12145 ,  G02B2006/12164 ,  G02F1/01 ,  G02F1/295 ,  G02F1/313 ,  G02F2202/32 ,  G02F2203/055

Abstract: On a waveguide 34 formed on a substrate 33, a plurality of comblike shaped electrodes 37, 38 that generate surface acoustic waves 37a, 38a from different directions are provided. And a periodic refractive indices portion 40 is formed, where the refractive indices are periodically distributed in accordance with the wavelengths of the surface acoustic waves 37a, 38a generated by applying a voltage to the comblike shaped electrodes 37, 38. And by changing a frequency of the applying voltage for sequentially changing the wavelengths of the surface acoustic waves 37a, 38a, the exiting direction of the light exiting from the periodic refractive indices portion 40 is scanned. This makes it possible to provide an optical functional device and an optical scanning apparatus that perform light scanning less costly but at a high speed, and that can secure a wide scanning angle.

Abstract translation: 在形成在基板33上的波导34上，设置有从不同方向产生表面声波37a，38a的多个梳状电极37,38。 并且形成周期性折射率部分40，其中折射率根据通过向梳状电极37,38施加电压而产生的声表面波37a，38a的波长周期性地分布。并且通过改变频率 扫描从周期性折射率部分40出射的光的顺行改变表面声波37a，38a的波长的出射方向的施加电压。 这使得可以提供一种光学功能器件和光学扫描装置，该光学功能器件和光学扫描装置执行光扫描成本较低但高速度，并且可以确保宽的扫描角度。