公开(公告)号：US08077586B2

公开(公告)日：2011-12-13

申请号：US12257213

申请日：2008-10-23

申请人： Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Nobuaki Kaji ,  Masahiro Saito

发明人： Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Nobuaki Kaji ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/127 ,  G11B7/0045 ,  G11B7/006

摘要： According to one embodiment, an optical recording head device includes a light source which outputs such a relaxation oscillation optical pulse that a full width at half maximum of a single pulse is 820 ps or less, a driving unit for driving the light source, an objective lens which converges emission light from the light source on a recording layer of a recording medium, and captures reflective light which is reflected by the recording layer of the recording medium, a distribution unit, placed between the light source and the objective lens, for distributing incident light, and a photodetection unit for receiving via the distribution unit the reflective light which is reflected by the recording layer of the recording medium, wherein a resonator length of the light source is 6560 μm or less.

摘要翻译： 根据一个实施例，光记录头装置包括一个光源，其输出这样的弛豫振荡光脉冲，单脉冲的半高全宽为820ps或更小，用于驱动光源的驱动单元， 将来自光源的发射光会聚在记录介质的记录层上并捕获由记录介质的记录层反射的反射光，放置在光源和物镜之间的分配单元，用于分布 以及光检测单元，用于经由分配单元接收由记录介质的记录层反射的反射光，其中光源的谐振器长度为6560μm以下。

公开(公告)号：US20080205212A1

公开(公告)日：2008-08-28

申请号：US12039648

申请日：2008-02-28

申请人： Takehiro Hiramatsu ,  Hideaki Ohsawa ,  Kazuo Watabe ,  Chosaku Noda ,  Naoki Morishita ,  Akihito Ogawa ,  Kazuto Kuroda ,  Nobuaki Kaji

发明人： Takehiro Hiramatsu ,  Hideaki Ohsawa ,  Kazuo Watabe ,  Chosaku Noda ,  Naoki Morishita ,  Akihito Ogawa ,  Kazuto Kuroda ,  Nobuaki Kaji

IPC分类号： G11B7/004

CPC分类号： G11B7/1359 ,  G11B7/0908 ,  G11B7/1275 ,  G11B7/131 ,  G11B7/1378 ,  G11B7/1381 ,  G11B7/13922 ,  G11B7/24

摘要： According to one embodiment, an optical head device provides a signal processing circuit which sets a control amount to move an objective lens so that a distance between the objective lens and a given recording layer of the an optical disc coincides with a focal position, an optical path length correction mechanism which corrects an influence of an aberration component producing an error in the focal distance, a thickness difference detection circuit which finds an amount of correction to be made by the optical path length, and an aberration correction circuit which generates a correction signal to correct the influence of the aberration component producing the error in the focal distance detected by the thickness difference detection circuit, and supplies the correction signal to the optical path length correction mechanism.

摘要翻译： 根据一个实施例，光学头装置提供信号处理电路，其设置控制量以移动物镜，使得物镜与光盘的给定记录层之间的距离与焦点位置一致，光学 路径长度校正机构，其校正产生焦距误差的像差分量的影响;求出由光程长度求出的校正量的厚度差检测电路;以及产生校正信号的像差校正电路 以校正产生由厚度差检测电路检测的焦距的误差的像差分量的影响，并将校正信号提供给光路长度校正机构。

公开(公告)号：US20060187778A1

公开(公告)日：2006-08-24

申请号：US11344956

申请日：2006-01-31

申请人： Nobuaki Kaji ,  Sumitaka Maruyama ,  Akihito Ogawa ,  Kazuo Watabe

发明人： Nobuaki Kaji ,  Sumitaka Maruyama ,  Akihito Ogawa ,  Kazuo Watabe

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/131 ,  G11B2007/0006

摘要： According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.

摘要翻译： 根据一个实施例，可以在信息记录介质中记录，再现和擦除信息的光学拾取单元具有不同间距的轨道，该分割装置具有至少一部分分割边界线，其位于第一 具有最大衍射角的次级衍射光和具有反射激光束的最小衍射角的1级衍射光的末端。

公开(公告)号：US20090109815A1

公开(公告)日：2009-04-30

申请号：US12260920

申请日：2008-10-29

申请人： Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Nobuaki Kaji ,  Masahiro Saito

发明人： Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Nobuaki Kaji ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/00456 ,  G11B7/1267

摘要： According to one embodiment, an optical disc device includes a light source portion which applies laser light to an optical disc, a drive portion which supplies a drive current to the light source portion so as to cause the light source portion to apply laser light of light pulses having relaxation oscillation, and a controller which controls the drive portion to supply a drive current so as to cause the light source portion to emit laser light of (n−1)×N (N is an integral number) light pulses having relaxation oscillation with respect to a mark with recording mark length nT (n: integral number, T: channel clock) to be recorded on the optical disc.

摘要翻译： 根据一个实施例，光盘装置包括向光盘施加激光的光源部分，向光源部分提供驱动电流以使光源部分施加光的激光的驱动部分 具有弛豫振荡的脉冲和控制驱动部分提供驱动电流以使光源部分发出具有弛豫振荡的（n-1）×N（N为整数）光脉冲的激光的控制器， 相对于要记录在光盘上的具有记录标记长度nT（n：整数，T：通道时钟）的标记。

公开(公告)号：US20090109808A1

公开(公告)日：2009-04-30

申请号：US12208658

申请日：2008-09-11

申请人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yasu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

发明人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yasu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/126 ,  H01S5/0428

摘要： According to one embodiment, a laser drive circuit which supplies a drive current to a laser element which outputs light at a predetermined wavelength, and a laser control circuit which supplies a predetermined timing pulse for generation of relaxation oscillation in a laser drive current supplied to the laser drive circuit, the laser control circuit supplying a laser drive current higher than a threshold value which is supplied from the laser drive circuit to the laser element to enable laser light to be output from the laser element, the laser control circuit setting the laser drive current to a level lower than the threshold value on the basis of the timing pulse.

摘要翻译： 根据一个实施例，提供驱动电流到激光元件的激光驱动电路，激光元件输出预定波长的光;以及激光控制电路，其提供预定的定时脉冲，以产生提供给 激光驱动电路，激光控制电路提供高于从激光驱动电路提供给激光元件的阈值的激光驱动电流，以使激光能够从激光元件输出，激光控制电路设置激光驱动 基于定时脉冲将电流电流降至低于阈值的电平。

公开(公告)号：US20080304401A1

公开(公告)日：2008-12-11

申请号：US11969732

申请日：2008-01-04

申请人： Hideo Ando ,  Hisashi Yamada ,  Seiji Morita ,  Koji Takazawa ,  Naomasa Nakamura ,  Kazuo Watabe ,  Nobuaki Kaji ,  Masahiko Mawatari ,  Nobuhisa Yoshida ,  Koichi Nagai

发明人： Hideo Ando ,  Hisashi Yamada ,  Seiji Morita ,  Koji Takazawa ,  Naomasa Nakamura ,  Kazuo Watabe ,  Nobuaki Kaji ,  Masahiko Mawatari ,  Nobuhisa Yoshida ,  Koichi Nagai

IPC分类号： G11B3/70

CPC分类号： G11B7/24079 ,  G11B7/00736 ,  G11B7/00745 ,  G11B20/00086 ,  G11B20/0021 ,  G11B20/00224 ,  G11B20/00253 ,  G11B20/00449 ,  G11B20/00492 ,  G11B20/00869 ,  G11B2220/215 ,  G11B2220/2562

摘要： According to one embodiment, an optical information recording medium includes pre-grooves with an irregular shape and lands each of which is sandwiched between the pre-grooves adjacent to each other, where the pre-grooves and lands are defined on an interface between a recording layer and a light reflection layer in a recording film, where the recording film includes a light reflectivity that enables reproduction with light of 650±5 nm, the recording layer includes a recording sensitivity with respect to light by a wavelength shorter than 650±5 nm, and a recording mark can be formed on the pre-groove by using light with a wavelength shorter than 650±5 nm.

摘要翻译： 根据一个实施例，光学信息记录介质包括具有不规则形状的预凹槽，每个凹槽被夹在彼此相邻的预凹槽之间，其中预凹槽和凹槽被界定在记录 层和光反射层，其中记录膜包括能够以650±5nm的光再现的光反射率，记录层包括相对于光的记录灵敏度小于650±5nm的波长 并且可以通过使用波长短于650±5nm的光，在预制槽上形成记录标记。

公开(公告)号：US20070002704A1

公开(公告)日：2007-01-04

申请号：US11479738

申请日：2006-06-30

申请人： Sumitaka Maruyama ,  Kazuo Watabe ,  Nobuaki Kaji ,  Akihito Ogawa

发明人： Sumitaka Maruyama ,  Kazuo Watabe ,  Nobuaki Kaji ,  Akihito Ogawa

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0903 ,  G11B7/0906 ,  G11B7/1353 ,  G11B2007/0006

摘要： To improve the quality of a tracking error signal when reproducing information recorded in an optical disc having tracks with two or more different pitches, using a diffraction element which is given a diffraction pattern configured to provide diffracted rays on the light-receiving surface of a photodetector which receives a reflected laser beam reflected on the recording layer of an optical disc and outputs a corresponding signal, to use diffracted rays generated according to pitches of optical tracks of an optical disc having different track pitches by switching to a predetermined combination in each of a phase different detection method (DPD) and a push pull method (PP).

摘要翻译： 为了提高跟踪误差信号的质量，当再现记录在具有两个或多个不同间距的轨道的光盘中的信息时，使用衍射元件，该衍射元件被配置为在光电检测器的光接收表面上提供衍射光线 其接收在光盘的记录层上反射的反射激光束，并输出相应的信号，以使用通过切换到具有不同轨道间距的光盘的光轨的光轨的间距产生的衍射光线 相位不同检测方法（DPD）和推拉法（PP）。

公开(公告)号：US07688874B2

公开(公告)日：2010-03-30

申请号：US11964329

申请日：2007-12-26

申请人： Nobuaki Kaji ,  Kazuo Watabe

发明人： Nobuaki Kaji ,  Kazuo Watabe

IPC分类号： H01S3/00

CPC分类号： G11B7/126 ,  H01S5/06835

摘要： A semiconductor laser driving device includes a current supply unit supplying current to a semiconductor laser; a first control unit controlling the current supply unit to supply a first current which is half or less of a lasing threshold of the semiconductor laser; and a second control unit controlling the current supply unit to supply a second current which is larger than the lasing threshold after a first time is passed from an edge of a clock signal.

摘要翻译： 一种半导体激光器驱动装置，包括向半导体激光器供电的电流源单元; 第一控制单元，控制电流供应单元以提供半导体激光器的激光阈值的一半或更小的第一电流; 以及第二控制单元，其控制电流供应单元，以在从时钟信号的边缘经过第一次之后提供大于激光阈值的第二电流。

公开(公告)号：US20090196138A1

公开(公告)日：2009-08-06

申请号：US12351226

申请日：2009-01-09

申请人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

发明人： Nobuaki Kaji ,  Kazuo Watabe ,  Takashi Usui ,  Keiichiro Yusu ,  Chosaku Noda ,  Kazuto Kuroda ,  Masahiro Saito

IPC分类号： G11B7/00

CPC分类号： G11B7/00456 ,  G11B7/126

摘要： According to one embodiment, in one embodiment of the invention, a laser drive circuit is provided with a first current source, a second drive current source, and a third current source. The control section selectively obtains a plurality of laser light use mode of controlling the from first to third current sources to use pulse laser light accompanying relaxation oscillation, and a complex laser light use mode of using laser light where laser pulses are combined, whose starting end has an abrupt impulse change portion caused by relaxation oscillation and whose intermediate section is a flat portion with a fixed intensity.

摘要翻译： 根据一个实施例，在本发明的一个实施例中，激光驱动电路设置有第一电流源，第二驱动电流源和第三电流源。 控制部选择性地获得多个激光使用模式，其控制从第一至第三电流源使用伴随弛豫振荡的脉冲激光，以及复合激光使用模式，其中使用激光脉冲组合的激光，其起始端 具有由松弛振动引起的突然脉冲变化部分，其中间部分是具有固定强度的平坦部分。

公开(公告)号：US20090141760A1

公开(公告)日：2009-06-04

申请号：US12260824

申请日：2008-10-29

申请人： Masahiro Saito ,  Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Nobuaki Kaji ,  Kazuto Kuroda

发明人： Masahiro Saito ,  Takashi Usui ,  Kazuo Watabe ,  Keiichiro Yusu ,  Chosaku Noda ,  Nobuaki Kaji ,  Kazuto Kuroda

IPC分类号： H01S3/00

CPC分类号： G11B7/1263

摘要： According to one embodiment, a drive control apparatus of a semiconductor laser includes a driving circuit which drives the semiconductor laser by applying pulses transiting from bias current to peak current to the semiconductor laser as laser driving current that causes relaxation oscillation of emission light intensity of the semiconductor laser, and a control circuit which controls the bias current such that the bias current has a predetermined ratio limiting fluctuation of a leading peak value of the relaxation oscillation occurring for each application of pulses relative to threshold current of the semiconductor laser. The control circuit changes the bias current to maintain the predetermined ratio relative to fluctuation of the threshold current.

摘要翻译： 根据一个实施例，半导体激光器的驱动控制装置包括驱动电路，该驱动电路通过施加从偏置电流流向峰值电流的脉冲来驱动半导体激光器作为激光驱动电流，该激光驱动电流引起半导体激光器的发射光强度的弛豫振荡 半导体激光器和控制偏置电流的控制电路，使得偏置电流相对于半导体激光器的阈值电流具有针对每次施加脉冲而产生的弛豫振荡的引导峰值的预定比例限制波动。 控制电路改变偏置电流以相对于阈值电流的波动保持预定的比率。