公开(公告)号：US20060098555A1

公开(公告)日：2006-05-11

申请号：US11267513

申请日：2005-11-07

申请人： Toshiaki Katsuma ,  Yu Kitahara ,  Masao Mori ,  Tetsuya Ori

发明人： Toshiaki Katsuma ,  Yu Kitahara ,  Masao Mori ,  Tetsuya Ori

IPC分类号： G11B7/00

CPC分类号： G11B7/1367 ,  G11B7/1369 ,  G11B7/1374 ,  G11B2007/0006

摘要： An objective optical system focuses light from a light source onto at least two different types of optical recording media having different substrate thicknesses in order to record or reproduce information on the optical recording media by using a variable refractive power element and an objective lens. The variable refractive power element may be a liquid crystal element with concentric zones that serves as a transparent plate having no convergence effect when no voltage is applied when selecting an AOD, DVD, or CD and as a converging lens when a voltage is applied when selecting a BD. Alternately, the variable refractive power element may electrically vary the refractive index of a nanoparticle dispersion or at least one liquid of a two-liquid lens element. A diffractive optical element may be used to assist in focusing light to four recording media. An optical pickup device includes the objective optical system.

公开(公告)号：US20050259554A1

公开(公告)日：2005-11-24

申请号：US11128279

申请日：2005-05-13

申请人： Toshiaki Katsuma ,  Masao Mori ,  Tetsuya Ori ,  Yu Kitahara

发明人： Toshiaki Katsuma ,  Masao Mori ,  Tetsuya Ori ,  Yu Kitahara

IPC分类号： G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1367 ,  G11B7/1374 ,  G11B7/1376 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

摘要： An objective optical system is formed of a diffractive optical element with a diffractive surface formed on a planar ‘virtual surface’ (i.e., a surface that would be planar but for the diffractive structure) and an objective lens for focusing three collimated light beams of three different wavelengths at three different numerical apertures onto desired positions of three different recording media with substrates of different thicknesses, such as an AOD, a DVD, and a CD, that introduce different amounts of spherical aberration in the focused beams. The objective optical system provides compensating spherical aberration to the three light beams while keeping equal the distance between the diffractive optical element and the objective lens, and focuses second-order diffracted light of one wavelength and first-order diffracted light of the other two wavelengths. An optical pickup device includes the objective optical system, the recording media, and a light source supplying the three light beams.

摘要翻译： 物镜光学系统由具有衍射面的衍射光学元件形成，该衍射面形成在平面“虚拟表面”（即，对于衍射结构为平面的表面）和用于聚焦三个准直光束的物镜 不同波长的三个不同数值孔径到具有不同厚度的衬底（例如AOD，DVD和CD）的三种不同记录介质的所需位置，其在聚焦光束中引入不同量的球面像差。 物镜光学系统对三个光束提供补偿球面像差，同时保持衍射光学元件和物镜之间的距离相等，并且聚焦一个波长的二次衍射光和另外两个波长的一次衍射光。 光拾取装置包括物镜光学系统，记录介质和提供三个光束的光源。

公开(公告)号：US20050105448A1

公开(公告)日：2005-05-19

申请号：US10988638

申请日：2004-11-16

申请人： Yu Kitahara ,  Toshiaki Katsuma ,  Masao Mori ,  Tetsuya Ori

发明人： Yu Kitahara ,  Toshiaki Katsuma ,  Masao Mori ,  Tetsuya Ori

IPC分类号： G02B5/18 ,  G02B13/00 ,  G02B13/18 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1392 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/0006

摘要： An objective lens is formed as an objective lens element with a diffractive surface on one side. The objective lens focuses a collimated light beam of a first wavelength diffracted by the objective lens onto a first recording medium, a collimated light beam of a second wavelength diffracted by the objective lens onto a second recording medium, and a diverging light beam of a third wavelength diffracted by the objective lens onto a third recording medium. The three light beams are focused at three different working distances from the objective lens and the diffraction orders of the diffracted light of two of the light beams is the same. The objective lens satisfies certain conditions related to the shortest of the three different working distances, the focal length of the objective lens element at the shortest of the three wavelengths, and the thickness of the objective lens.

摘要翻译： 物镜形成为在一侧具有衍射面的物镜元件。 物镜将由物镜衍射的第一波长的准直光束聚焦到第一记录介质上，将由物镜衍射的第二波长的准直光束聚焦到第二记录介质上，并将第三波长的发散光束 波长由物镜衍射到第三记录介质上。 三个光束聚焦在与物镜三个不同的工作距离处，两个光束的衍射光的衍射级相同。 物镜满足与三个不同工作距离中最短的物体相关的某些条件，三个波长中最短的物镜的焦距和物镜的厚度。

公开(公告)号：US20050041560A1

公开(公告)日：2005-02-24

申请号：US10922958

申请日：2004-08-23

申请人： Toshiaki Katsuma ,  Yu Kitahara ,  Tetsuya Ori ,  Masao Mori

发明人： Toshiaki Katsuma ,  Yu Kitahara ,  Tetsuya Ori ,  Masao Mori

IPC分类号： G02B5/18 ,  G02B13/00 ,  G11B7/00 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/1374 ,  G11B7/1376 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

摘要： An objective lens consists of two lens elements of different materials that are cemented. The lens surfaces that are cemented includes a phase function so that the cemented surface forms a optical diffractive surface that enables the objective lens to focus incident light of three different wavelengths with different numerical apertures onto different optical recording media. Three conditions are satisfied so as to achieve optimum imaging. The optical diffractive surface may be shaped so that the order of the diffracted light of the shortest wavelength λ1 having the largest diffracted intensity is different from the order of the diffracted light of the second wavelength λ2 having the largest diffracted intensity, and the order of the diffracted light of the first wavelength λ1 having the largest diffracted intensity is also different from the order of the diffracted light of the third wavelength λ3 having the largest diffracted intensity.

摘要翻译： 物镜由两种胶合的不同材料的透镜元件组成。 胶合的透镜表面包括相位功能，使得胶合表面形成光学衍射表面，使得物镜能够使具有不同数值孔径的三种不同波长的入射光聚焦到不同的光学记录介质上。 满足三个条件以实现最佳成像。 光学衍射面可以被成形为具有最大衍射强度的最短波长λ1的衍射光的次序与具有最大衍射强度的第二波长λ2的衍射光的次序不同，并且 具有最大衍射强度的第一波长λ1的衍射光也与具有最大衍射强度的第三波长λ3的衍射光的次数不同。

公开(公告)号：US07911712B2

公开(公告)日：2011-03-22

申请号：US12607753

申请日：2009-10-28

申请人： Yu Kitahara ,  Yoko Yamamoto ,  Taro Asami

发明人： Yu Kitahara ,  Yoko Yamamoto ,  Taro Asami

IPC分类号： G02B9/60

CPC分类号： G02B9/60

摘要： An imaging lens includes, in order from an object side, a first lens having a negative power and including a concave image-side surface, a second lens having a positive power, a stop, a third negative lens, which is a biconcave lens, a fourth lens having a positive power, and a fifth lens having a positive power and including a convex image-side surface. The imaging lens satisfies the following conditional expressions: 0.18

摘要翻译： 成像透镜从物体侧依次包括具有负光焦度并包括凹面像侧面的第一透镜，具有正光焦度的第二透镜，作为双凹透镜的第三透镜，第三负透镜， 具有正功率的第四透镜和具有正功率并包括凸像侧表面的第五透镜。 成像透镜满足以下条件表达式：0.18 <（D4 + D5）/ f <0.44和0.18

公开(公告)号：US20090296227A1

公开(公告)日：2009-12-03

申请号：US12471182

申请日：2009-05-22

申请人： Toshiaki Katsuma ,  Masao Mari ,  Yu Kitahara ,  Tetsuya Ori

发明人： Toshiaki Katsuma ,  Masao Mari ,  Yu Kitahara ,  Tetsuya Ori

IPC分类号： G02B3/00 ,  B29D11/00

CPC分类号： G02B13/0025 ,  G02B3/04 ,  G11B7/1353 ,  G11B7/1374

摘要： A laser beam output from a semiconductor laser light source 1 is transmitted through a cover glass 2 in the optical axis Z direction, is incident on a molded lens 4 in a state of divergent rays, is converted into convergent rays by the molded lens 4, and is applied onto a recording face 5 of the optical recording medium. A diaphragm 3 is arranged. An area of each lens surface onto which a luminous flux of the laser beam restricted by the diaphragm 3 is applied corresponds to an effective area. The following expression (1) is satisfied: d1−d0≧0.04 mm  (1) where d0 denotes an effective aperture of one of the lens surfaces, and d1 denotes an outer diameter of the one of the lens surfaces.

摘要翻译： 从半导体激光光源1输出的激光束沿着光轴Z方向透过盖玻璃2，以发散光线入射到模制透镜4上，通过模制透镜4转换成会聚光线， 并且被施加到光学记录介质的记录面5上。 设置有隔膜3。 每个透镜表面上施加受光阑3限制的激光束的光通量的区域对应于有效面积。 满足以下表达式（1）：d1-d0> = 0.04mm（1）其中d0表示透镜表面之一的有效孔径，d1表示透镜表面之一的外径。

公开(公告)号：US07589914B2

公开(公告)日：2009-09-15

申请号：US11826928

申请日：2007-07-19

申请人： Toshiaki Katsuma ,  Masao Mori ,  Yu Kitahara ,  Tetsuya Ori

发明人： Toshiaki Katsuma ,  Masao Mori ,  Yu Kitahara ,  Tetsuya Ori

IPC分类号： G02B13/18

CPC分类号： G02B13/0025 ,  G02B3/04 ,  G11B7/1353 ,  G11B7/1374

摘要： A laser beam output from a semiconductor laser light source 1 is transmitted through a cover glass 2 in the optical axis Z direction, is incident on a molded lens 4 in a state of divergent rays, is converted into convergent rays by the molded lens 4, and is applied onto a recording face 5 of the optical recording medium. A diaphragm 3 is arranged. An area of each lens surface onto which a luminous flux of the laser beam restricted by the diaphragm 3 is applied corresponds to an effective area. The following expression (1) is satisfied: d1−d0≧0.04 mm  (1) where d0 denotes an effective aperture of one of the lens surfaces, and d1 denotes an outer diameter of the one of the lens surfaces.

摘要翻译： 从半导体激光光源1输出的激光束沿着光轴Z方向透过盖玻璃2，以发散光线入射到模制透镜4上，通过模制透镜4转换成会聚光线， 并且被施加到光学记录介质的记录面5上。 设置有隔膜3。 每个透镜表面上施加受光阑3限制的激光束的光通量的区域对应于有效面积。 满足以下表达式（1）：<？in-line-formula description =“In-line formula”end =“lead”？> d1-d0> = 0.04 mm（1）<？in-line-formula description = “直线公式”end =“tail”？>其中d0表示一个透镜表面的有效孔径，d1表示透镜表面之一的外径。

公开(公告)号：US20090129241A1

公开(公告)日：2009-05-21

申请号：US12273139

申请日：2008-11-18

申请人： Toshiaki KATSUMA ,  Masao MORI ,  Tetsuya ORI ,  Yu KITAHARA

发明人： Toshiaki KATSUMA ,  Masao MORI ,  Tetsuya ORI ,  Yu KITAHARA

IPC分类号： G11B7/00

CPC分类号： G02B27/0031 ,  G11B7/1374

摘要： An objective lens consists of a single lens element, and has a light source side surface formed into a convex surface having a large curvature and an optical recording medium side surface has a small curvature. The both surfaces are aspheric surfaces. Also, the objective lens satisfies the following expressions (1) to (3): 0.7

摘要翻译： 物镜由单个透镜元件组成，具有形成为具有大曲率的凸面的光源侧面，光记录介质侧面的曲率小。 两个表面都是非球面。 此外，物镜满足以下表达式（1）〜（3）：<？in-line-formula description =“In-line formula”end =“lead”？> 0.7 <？in-line-formula description =“In-line formula”end =“lead”？> 0.70 <？in-line-formula description =“In-line Formulas”end =“lead”？> 0.48 其中NA表示物镜在光记录介质侧的数值孔径，d表示物镜的厚度 透镜在光轴上以mm表示，f表示物镜的焦距，单位为mm。 X等于（X1-X2）（n-1）/（NA.f），其中X1和X2表示与各个表面中的下垂量有关的值，n表示折射率。

公开(公告)号：US07457223B2

公开(公告)日：2008-11-25

申请号：US10922958

申请日：2004-08-23

申请人： Toshiaki Katsuma ,  Yu Kitahara ,  Tetsuya Ori ,  Masao Mori

发明人： Toshiaki Katsuma ,  Yu Kitahara ,  Tetsuya Ori ,  Masao Mori

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/1374 ,  G11B7/1376 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

摘要： An objective lens consists of two lens elements of different materials that are cemented. The lens surfaces that are cemented includes a phase function so that the cemented surface forms a optical diffractive surface that enables the objective lens to focus incident light of three different wavelengths with different numerical apertures onto different optical recording media. Three conditions are satisfied so as to achieve optimum imaging. The optical diffractive surface is shaped so that the order of the diffracted light of the shortest wavelength λ1 having the largest diffracted intensity is zero and different from the order of the diffracted light of the second wavelength λ2 having the largest diffracted intensity, and the order of the diffracted light of the first wavelength λ1 having the largest diffracted intensity is also different from the order of the diffracted light of the third wavelength λ3 having the largest diffracted intensity.

摘要翻译： 物镜由两种胶合的不同材料的透镜元件组成。 胶合的透镜表面包括相位功能，使得胶合表面形成光学衍射表面，使得物镜能够使具有不同数值孔径的三种不同波长的入射光聚焦到不同的光学记录介质上。 满足三个条件以实现最佳成像。 光衍射面成形为具有最大衍射强度的最短波长λ1的衍射光的次数为零，并且与衍射强度最大的第二波长λ2的衍射光的次序不同， 具有最大衍射强度的第一波长λ1的衍射光也与具有最大衍射强度的第三波长λ3的衍射光的次数不同。

公开(公告)号：US07443779B2

公开(公告)日：2008-10-28

申请号：US11019203

申请日：2004-12-23

申请人： Yu Kitahara ,  Tetsuya Ori ,  Toshiaki Katsuma ,  Masao Mori ,  Hiromitsu Yamakawa

发明人： Yu Kitahara ,  Tetsuya Ori ,  Toshiaki Katsuma ,  Masao Mori ,  Hiromitsu Yamakawa

IPC分类号： G11B7/00

CPC分类号： G11B7/1367 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

摘要： An objective optical system includes a diffractive optical element on the light source side of an objective lens for focusing incident light of three different wavelengths with two different numerical apertures onto three different optical recording media. The diffractive optical element is formed of two lens elements made of different materials that are cemented together at a diffractive surface. Three conditions are satisfied so as to achieve optimum imaging. The diffractive surface may be shaped so that the order of the diffracted light of the shortest wavelength λ2 having the largest diffracted intensity is different from the order of the diffracted light of the second wavelength λ2 having the largest diffracted intensity, and the order of the diffracted light of the first wavelength λ1 having the largest diffracted intensity is also different from the order of the diffracted light of the third wavelength λ3 having the largest diffracted intensity.

摘要翻译： 物镜光学系统包括在物镜的光源侧的衍射光学元件，用于将具有两个不同数值孔径的三种不同波长的入射光聚焦到三种不同的光记录介质上。 衍射光学元件由在衍射表面上胶合在一起的不同材料制成的两个透镜元件形成。 满足三个条件以实现最佳成像。 衍射表面可以被成形为使得具有最大衍射强度的最短波长λ1的衍射光的次序与具有最大衍射强度的第二波长λ2的衍射光的次序不同， 具有最大衍射强度的第一波长λ1的衍射光也与具有最大衍射强度的第三波长λ3的衍射光的顺序不同。