公开(公告)号：US07466642B2

公开(公告)日：2008-12-16

申请号：US10511867

申请日：2003-04-18

申请人： Kousei Sano ,  Yoshiaki Komma ,  Hidenori Wada ,  Akihiro Yasuda

发明人： Kousei Sano ,  Yoshiaki Komma ,  Hidenori Wada ,  Akihiro Yasuda

IPC分类号： G11B7/135

CPC分类号： G11B7/1275 ,  G02B5/32 ,  G11B7/1353 ,  G11B2007/0006

摘要： The present invention provides a first light source (21) that emits light of a first wavelength, that at least either records onto or reproduces information from an information recording medium (30), a light source (22) that emits light of a second wavelength that records onto or reproduces information from an information recording medium (33), a light source (23) that emits light of a third wavelength that records onto or reproduces information from an information recording medium (23), focusing means, an optical element (28) that passes light of the first wavelength and diffracts light of the second and third wavelengths, wherein the optical element (28) is an optical element in which grooves are formed in a substrate, wherein the expression: 380 nm≦(n−1)×d≦420 nm is satisfied, where n is a refractive index of the substrate at a wavelength of 400 nm, and d (nm) is a depth per step of the grooves, and wherein the grooves are formed in two steps of depth d and depth 2d.

摘要翻译： 本发明提供了一种发射第一波长的光的第一光源（21），其至少从信息记录介质（30）记录信息或从信息记录介质再现信息，发射第二波长的光的光源（22） 从信息记录介质（33）记录信息或从信息记录介质（23）记录第三波长的光的光源（23），从信息记录介质（23），聚焦装置，光学元件（ 28），其通过第一波长的光并衍射第二和第三波长的光，其中光学元件（28）是其中在衬底中形成沟槽的光学元件，其中表达式： 描述=“在线公式”end =“lead”？> 380 nm <=（n-1）xd <= 420 nm <？in-line-formula description =“In-line Formulas”end =“tail”？ >其中n是衬底在400nm波长处的折射率，d（nm） ）是每个凹槽的每个步骤的深度，并且其中凹槽以深度d和深度2d的两个步骤形成。

公开(公告)号：US20080101199A1

公开(公告)日：2008-05-01

申请号：US11924225

申请日：2007-10-25

申请人： Fumitomo YAMASAKI ,  Kousei Sano ,  Yoshiaki Komma ,  Kanji Wakabayashi ,  Toshiyasu Tanaka

发明人： Fumitomo YAMASAKI ,  Kousei Sano ,  Yoshiaki Komma ,  Kanji Wakabayashi ,  Toshiyasu Tanaka

IPC分类号： G11B7/135

CPC分类号： G11B7/1275 ,  G11B7/0903 ,  G11B7/0906 ,  G11B7/0909 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0006

摘要： The present invention aims to provide an optical head and an optical disk device capable of suitably detecting tracking error signals for different types of optical discs.A polarizing hologram element includes a first area and a second area adjacent to the first area in an area where a beam reflected and diffracted by a BD passes. The first area includes a first transmission area for transmitting many 1st-order diffracted lights from the BD, a second transmission area adjacent to the first transmission area and closer to an optical axis than the first transmission area, and a third transmission area adjacent to the first and second transmission areas. The second area includes a fourth transmission area for transmitting many 1st-order diffracted lights from the BD, a fifth transmission area adjacent to the fourth transmission area and closer to the optical axis than the fourth transmission area, and a sixth transmission area adjacent to the fourth and fifth transmission areas.

摘要翻译： 本发明的目的在于提供一种能够适当地检测不同类型的光盘的跟踪误差信号的光头和光盘装置。 偏振全息元件包括在BD反射和衍射的光束通过的区域中与第一区域相邻的第一区域和第二区域。 第一区域包括用于从BD传输许多1个次衍射光的第一透射区域，与第一透射区域相邻并且比第一透射区域更靠近光轴的第二透射区域， 以及与第一和第二传输区域相邻的第三传输区域。 第二区域包括用于从BD传输许多1个级衍射光的第四传输区域，与第四传输区域相邻并且比第四传输区域更靠近光轴的第五传输区域， 以及与第四和第五传输区域相邻的第六传输区域。

公开(公告)号：US07203138B2

公开(公告)日：2007-04-10

申请号：US10691317

申请日：2003-10-22

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

IPC分类号： G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/1353 ,  G11B2007/13727

摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including tracks having prescribed grooves; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals; and a light division element for dividing a reflected light reflected by the information memory medium. A relationship λ/(NA·Tp)≧1 is satisfied where λ is the wavelength of the light emitted from the light source, NA is the numerical aperture of the collection optical system, and Tp is the distance from a center of the track in the information memory medium to a center of the adjacent track; and the tracking error signal generator generates a tracking error signal from an area except for an overlapping area of the reflected light, the overlapping area being an area of overlapping two circles each having a radius of 1 and having a center of one circle being apart from a center of the reflected light beam at a distance of λ/(NA·2Tp) in a direction orthogonal to the track from a center of a cross-section of the reflected light, when the cross-section of the reflected light on the light division element in a circle having a radius of 1.

摘要翻译： 光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到包括具有规定凹槽的轨道的信息存储介质; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 跟踪误差信号发生器，用于接收从光检测器输出的信号并基于该信号产生跟踪误差信号; 以及用于分割由信息存储介质反射的反射光的光分离元件。 满足λ/（NA.Tp）> = 1的关系，其中λ是从光源发射的光的波长，NA是收集光学系统的数值孔径，Tp是从轨道的中心的距离 在信息存储介质中到相邻轨道的中心; 并且跟踪误差信号发生器从除了反射光的重叠区域之外的区域产生跟踪误差信号，重叠区域是具有半径为1并且具有一个圆的中心的两个圆的重叠区域 在反射光的横截面的中心处，在与轨道正交的方向上的距离λ/（NA.2Tp）处的反射光束的中心，当反射光的横截面 半径为1的圆的分割元素。

公开(公告)号：US07088513B2

公开(公告)日：2006-08-08

申请号：US10823673

申请日：2004-04-14

申请人： Toshiyasu Tanaka ,  Yoshiaki Komma ,  Kousei Sano

发明人： Toshiyasu Tanaka ,  Yoshiaki Komma ,  Kousei Sano

IPC分类号： G02B5/18

CPC分类号： G11B7/1275 ,  G02B5/1866 ,  G02B5/32 ,  G03H2240/15 ,  G11B7/1353 ,  G11B2007/0006

摘要： A diffraction element includes a light-transmittable member and a diffraction grating formed on at least one face of the light-transmittable member. When a first laser beam having a first wavelength λ1 and a second laser beam having a second wavelength λ2 are transmitted through the diffraction element at first and second diffraction efficiencies, respectively, the diffraction element functions to equalize the first and second diffraction efficiencies to each other by only the one face of the diffraction element. The diffraction grating has a first phase modulation amount ø1 for the first laser beam and a second phase modulation amount ø2 for the second laser beam and the first and second phase modulation amounts ø1 and ø2 are, respectively, approximate to (2πN1±Δø) and (2πN2±Δø) in which “N1” and “N2” are natural numbers and “Δø” is a phase variation amount.

摘要翻译： 衍射元件包括形成在可透光部件的至少一个面上的透光部件和衍射光栅。 当具有第一波长λ1的第一激光束和具有第二波长λ2的第二激光束分别以第一和第二衍射效率透射穿过衍射元件时，衍射元件用于相互之间的第一和第二衍射效率相等 只有衍射元件的一面。 衍射光栅具有第一激光束的第一相位调制量ø1和第二激光束的第二相位调制量ø2，第一和第二相位调制量ø1和ø2分别接近（2piN1±Δω）和 （2piN2±Δφ），其中“N1”和“N2”是自然数，“Deltaø”是相位变化量。

公开(公告)号：US06741416B2

公开(公告)日：2004-05-25

申请号：US09736798

申请日：2000-12-14

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hajime Hatada ,  Ikuo Ohmura

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hajime Hatada ,  Ikuo Ohmura

IPC分类号： G11B5596

CPC分类号： G11B5/5526 ,  G11B5/59677

摘要： A device and a method are provided in which stable tracking control can be carried out even in an arbitrary phase by optically reading pits provided in a disk when information is recorded on and reproduced from the disk with a magnetic head. With respect to difference signals obtained from a main beam signal and sub-beam signals obtained through three-beam type photodetectors, gain correction is executed in variable gain amplifiers, respectively, so that output signals therefrom have same amplitude levels and are different in phase by 90 degrees in a track crossing direction, and thus a tracking error signal is generated by being synthesized from the output signals. Based on the tracking error signal, tracking control is carried out.

摘要翻译： 提供了一种装置和方法，其中即使在磁盘上记录信息并从磁盘再现的情况下，即使在任意阶段也可以通过光学读取设置在盘中的凹坑来进行稳定的跟踪控制。 对于从主波束信号和通过三光束型光电检测器获得的子波束信号获得的差分信号，分别在可变增益放大器中执行增益校正，使得其输出信号具有相同的幅度电平并且在相位上不同 通过从输出信号合成，产生轨迹交叉方向90度的跟踪误差信号。 基于跟踪误差信号，进行跟踪控制。

公开(公告)号：US06665257B2

公开(公告)日：2003-12-16

申请号：US09761072

申请日：2001-01-15

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

IPC分类号： G11B700

CPC分类号： G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/131 ,  G11B7/1381

摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including at least one of a track having a mark or a space selectively arranged, and a track having a prescribed groove; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a division element for dividing the light reflected by the information memory medium and allowing the light to be received by the light detector; a switch element for receiving a first signal and a second signal, which are respectively obtained in accordance with the reflected light incident on a first prescribed area and a second prescribed area of the division element and outputting either one of the first signal or the second signal, the first and second prescribed areas being obtained by dividing the division element along at least one division line; and an information reproduction signal generator for receiving the signal output by the switch element and generating information recorded on the track. The switch element outputs either one of the first signal and the second signal in accordance with a distance and e positional relationship between a light collection point of the light output from the collection light system and the track.

摘要翻译： 光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到信息存储介质中，所述信息存储介质包括具有选择性排列的标记或空间的轨道和具有规定槽的轨道中的至少一个; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 分割元件，用于分割由信息存储介质反射的光并允许光被光检测器接收; 用于接收第一信号和第二信号的开关元件，它们分别根据入射在分割元件的第一规定区域和第二规定区域上的反射光获得并输出第一信号或第二信号 所述第一规定区域和所述第二规定区域通过沿着至少一个分割线划分所述分割单元而获得; 以及信息再现信号发生器，用于接收由开关元件输出的信号并产生记录在轨道上的信息。 开关元件根据从收集光系统输出的光的光收集点与轨道之间的距离和e位置关系，输出第一信号和第二信号中的任一个。

公开(公告)号：US06418095B1

公开(公告)日：2002-07-09

申请号：US08877363

申请日：1997-06-17

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

IPC分类号： G11B700

CPC分类号： G11B7/1381 ,  G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/131

摘要： An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.

公开(公告)号：US5892741A

公开(公告)日：1999-04-06

申请号：US676540

申请日：1996-07-09

申请人： Shin-ichi Kadowaki ,  Shinichi Tanaka ,  Seiji Nishiwaki ,  Kousei Sano ,  Seiji Nishino

发明人： Shin-ichi Kadowaki ,  Shinichi Tanaka ,  Seiji Nishiwaki ,  Kousei Sano ,  Seiji Nishino

IPC分类号： G11B5/016 ,  G11B5/55 ,  G11B5/596 ,  G11B7/09 ,  G11B7/00

CPC分类号： G11B5/59627 ,  G11B5/5556 ,  G11B5/59677 ,  G11B5/016 ,  G11B5/5565 ,  G11B7/0903 ,  G11B7/0941

摘要： In a magnetic recording medium to detect tracking error signals optically where an optical head and a magnetic head scan different tracks, two signals having phases different by .pi./2 are generated and added or subtracted. By changing the amplitude of the two signals with a changeable gain amplifying means, a phase of a tracking error signal is changed so that the servo operation is conducted at the middle of the amplitude of the tracking error signal to keep the magnetic head on track.

摘要翻译： 在用于检测光头和磁头扫描不同轨迹的光学跟踪误差信号的磁记录介质中，产生具有不同于π/ 2的相位的两个信号，并相加或相减。 通过用可变增益放大装置改变两个信号的振幅，改变跟踪误差信号的相位，使得伺服操作在跟踪误差信号的幅度的中间进行，以保持磁头跟踪。

公开(公告)号：US08780683B2

公开(公告)日：2014-07-15

申请号：US14007176

申请日：2012-04-09

申请人： Kousei Sano ,  Tatsuya Takaoka ,  Hidenori Wada ,  Keiichi Matsuzaki

发明人： Kousei Sano ,  Tatsuya Takaoka ,  Hidenori Wada ,  Keiichi Matsuzaki

IPC分类号： G11B7/00

CPC分类号： G11B7/007 ,  B82Y10/00 ,  B82Y20/00 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/24085

摘要： An optical disc (120) has a first mark (131) disposed at the center of a track, a second mark (132) disposed away from the center of the track in a tracking direction thereof by a distance b1, and disposed away from the first mark (131) in the direction along the track by a distance L, and a third mark (133) disposed away from the center of the track in the tracking direction opposite to that of the second mark (132) by a distance b2, and disposed away from the first mark (131) in the direction along the track by a distance L2. The second and third marks (132) and (133) generate scattered light depending on the distance between a scattering medium (103) and each of the marks by irradiating the scattering medium (103) in an optical information apparatus with light. The distances b1 and b2 are smaller than 50 nm.

摘要翻译： 光盘（120）具有设置在轨道中心的第一标记（131），沿跟踪方向远离轨道中心远离距离b1设置的第二标记（132），远离 沿着轨道的方向上的第一标记（131）距离L;以及第三标记（133），沿着与第二标记（132）的跟踪方向相反的跟踪方向远离轨道的中心距离为b2， 并且沿着轨道的方向远离第一标记（131）远离距离L2。 第二和第三标记（132）和（133）通过在具有光的光学信息装置中照射散射介质（103），根据散射介质（103）和每个标记之间的距离产生散射光。 距离b1和b2小于50nm。

公开(公告)号：US20130152110A1

公开(公告)日：2013-06-13

申请号：US13817020

申请日：2012-06-15

申请人： Hideki Nakata ,  Kousei Sano

发明人： Hideki Nakata ,  Kousei Sano

IPC分类号： G11B33/14

CPC分类号： G11B33/146 ,  G11B7/1387 ,  G11B7/24097 ,  G11B23/0316 ,  G11B25/04 ,  G11B25/043 ,  G11B33/1446

摘要： The present application discloses an optical drive system, including: a cartridge with a wall portion which defines a storage room to store a rotatable record medium with a light receiving surface scanned by light; and a drive device with a rotary driver, which rotates the record medium, an optical element, which irradiates the light, and a movement driver, which moves the optical element between inner and outer positions. The wall portion is provided with an outlet at the outer position. Air in the storage room is exhausted from the outlet by air flow resulting from rotation of the record medium. The outlet is divided into first and second opening regions by a movement track of the optical element. The first opening region is larger than the second opening region at an upstream position of the first opening region in a rotational direction of the record medium.

摘要翻译： 本申请公开了一种光驱系统，包括：具有壁部分的盒，其限定存储室以存储具有由光扫描的光接收表面的可旋转记录介质的壁部; 以及具有旋转驱动器的驱动装置，其使记录介质旋转，照射光的光学元件和使光学元件在内部位置和外部位置之间移动的移动驱动器。 壁部在外部位置设有出口。 存储室中的空气由于记录介质旋转引起的空气流从出口排出。 出口通过光学元件的运动轨道分成第一和第二开口区域。 第一开口区域大于在记录介质的旋转方向上的第一开口区域的上游位置处的第二开口区域。