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41. 发明授权

US5590111A Method of controlling recording of optical records 失效
标题翻译：控制光学记录记录的方法
公开(公告)号：US5590111A
公开(公告)日：1996-12-31
申请号：US91003
申请日：1993-07-13
申请人： Fumiyoshi Kirino , Takeshi Maeda , Hiroshi Ide , Toshimitsu Kaku , Seiichi Mita , Kazuo Shigematsu , Tsuyoshi Toda
发明人： Fumiyoshi Kirino , Takeshi Maeda , Hiroshi Ide , Toshimitsu Kaku , Seiichi Mita , Kazuo Shigematsu , Tsuyoshi Toda
IPC分类号： G11B7/0045 , G11B7/013 , G11B7/125 , G11B11/105 , G11B20/10 , G11B20/12 , G11B20/18 , G11B7/00 , G11B3/90 , G11B5/09
CPC分类号： G11B7/126 , G11B11/1053 , G11B11/10595 , G11B20/10009 , G11B20/10212 , G11B20/1816 , G11B7/0045 , G11B7/1267 , G11B11/10506 , G11B11/10508 , G11B20/1258 , G11B7/24085
摘要： In a write control method on an optical recording, at least one shift amount selected from the defocus amount of a laser beam on a recording medium, the shift amount of a recording position on a recording track and the shift amount of laser power during recording is controlled such that the selected amount falls within a predetermined range. Subsequently, a trial signal is trially recorded at a plurality of trial zones on the recording medium by using a laser power value as a parameter. The recorded trial signal is read and a difference .DELTA.V between center levels of a highest density waveform and a lowest density waveform is detected. In connection with each trial zone, the laser power value when a reading trial signal which makes the difference .DELTA.V minimum is recorded is defined as an optimum recording power value. Regular data is recorded at a predetermined storage area on the recording medium by using an optimum laser power value determined in connection with a trial zone closest to the predetermined storage area.
摘要翻译：在光学记录中的写入控制方法中，从记录介质上的激光束的散焦量，记录轨道上的记录位置的偏移量和记录期间的激光功率的移动量选择的至少一个偏移量是被控制使得所选择的量落在预定范围内。随后，通过使用激光功率值作为参数，在记录介质上的多个试验区上试用信号。读取记录的试验信号，并检测最高密度波形的中心水平和最低密度波形之间的差ΔTA。结合每个试验区域，当记录使DELTA V最小值的读取试验信号被记录时的激光功率值被定义为最佳记录功率值。通过使用与最接近预定存储区域的试验区域确定的最佳激光功率值，将正常数据记录在记录介质上的预定存储区域。

42. 发明授权

US5457666A Light modulation method for forming a mark in magneto-optical recording system 失效
标题翻译：用于在磁光记录系统中形成标记的光调制方法
公开(公告)号：US5457666A
公开(公告)日：1995-10-10
申请号：US114062
申请日：1993-08-31
申请人： Tsuyoshi Toda , Hiroshi Ide , Fumiyoshi Kirino , Takeshi Maeda , Hiroyuki Tsuchinaga , Toshimitsu Kaku , Seiichi Mita , Kazuo Shigematsu
发明人： Tsuyoshi Toda , Hiroshi Ide , Fumiyoshi Kirino , Takeshi Maeda , Hiroyuki Tsuchinaga , Toshimitsu Kaku , Seiichi Mita , Kazuo Shigematsu
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/006 , G11B7/125 , G11B11/10 , G11B11/105 , G11B7/24
CPC分类号： G11B7/126 , G11B11/10506 , G11B11/1053 , G11B7/0045 , G11B7/006
摘要： A magneto-optical disk recording control method using the mark length recording method wherein the marks and gap regions between marks are recorded on the surface of the disk by maintaining a constant temperature distribution during the recording. The laser is driven to a non-recording level in gap regions between marks that exceed a base recording level used for reproduction of the marks. When a mark is recorded, the laser power is increased to a recording power level and after the mark has been recorded, the laser power level is reduced to the base power level, followed by being raised to the gap recording level. Control of the laser is performed by superposing a plurality of pulse trains that are synchronized with respect to a clock having a cycle T. The pulse trains are derived from the code train to be recorded and have pulses with a duration that is an integral multiple of (1/2)T. If the pulse width of the recording code train exceeds 2T, then the laser is controlled to reach a first power level in accordance with pulses of a first pulse train, be reduced to the gap recording level and then raised to a second power level in accordance with a second recording pulse train to maintain the temperature distribution constant during the recording of the mark. For the recording of longer marks, the laser is controlled to vary between the second power level and the gap recording level.
摘要翻译：一种使用标记长度记录方法的磁光盘记录控制方法，其中通过在记录期间保持恒定的温度分布将标记之间的标记和间隙区域记录在盘的表面上。在超过用于再现标记的基本记录水平的标记之间的间隙区域中激光被驱动到非记录水平。当记录标记时，激光功率增加到记录功率水平，并且在记录标记之后，激光功率水平降低到基本功率水平，然后升高到间隙记录水平。通过叠加相对于具有周期T的时钟同步的多个脉冲串来执行激光的控制。脉冲序列是从要被记录的代码序列导出的，具有持续时间为整数倍的脉冲（1/2）T。如果记录代码串的脉冲宽度超过2T，则根据第一脉冲序列的脉冲将激光器控制到达到第一功率电平，减小到间隙记录电平，然后依次升高到第二功率电平具有第二记录脉冲串，以在记录记录期间保持温度分布恒定。为了记录更长的标记，激光器被控制在第二功率电平和间隙记录电平之间变化。

43. 发明授权

US5214629A Optical disc having a high-speed access capability and reading apparatus therefor 失效
标题翻译：具有高速存取能力的光盘及其读取装置
公开(公告)号：US5214629A
公开(公告)日：1993-05-25
申请号：US484409
申请日：1990-02-26
申请人： Hitoshi Watanabe , Takeshi Maeda
发明人： Hitoshi Watanabe , Takeshi Maeda
IPC分类号： G11B7/007 , G11B7/085 , G11B7/09 , G11B19/20
CPC分类号： G11B19/20 , G11B7/00745 , G11B7/08529 , G11B7/08541 , G11B7/0938
摘要： An optical disc for a sample servo type optical disc system. Servo areas disposed periodically on each of tracks of the optical disc are sequentially offset relative to those on the adjacent tracks as viewed in the radial direction by a predetermined distance. An apparatus used for signal read-out from the optical disc comprises a circuit for detecting a servo signal originating in servo pits from a detection signal output from a photodetector, a circuit for generating a clock signal synchronized with the servo signal, a counter for outputting a count value representative of the counted clocks at the timing of the servo signal, and a circuit for generating a light spot velocity signal from the count value.
摘要翻译：一种用于样品伺服型光盘系统的光盘。周期性地设置在光盘的每个轨道上的伺服区域相对于在径向方向上观察的相邻轨道上的轨迹顺序偏移预定距离。用于从光盘读出信号的装置包括用于从光电检测器输出的检测信号中检测源自伺服凹坑的伺服信号的电路，用于产生与伺服信号同步的时钟信号的电路，用于输出的计数器表示伺服信号的定时的计数时钟的计数值，以及从该计数值生成光点速度信号的电路。

44. 发明授权

US5109374A Small-sized optical memory device and information processing apparatus utilizing cylindrically shaped information recording medium 失效
标题翻译：小尺寸光学记忆体设备和信息处理设备利用圆柱形信息记录介质
公开(公告)号：US5109374A
公开(公告)日：1992-04-28
申请号：US406519
申请日：1989-09-13
申请人： Yoshito Tsunoda , Hiroshi Yasuoka , Takeshi Maeda
发明人： Yoshito Tsunoda , Hiroshi Yasuoka , Takeshi Maeda
IPC分类号： G11B11/10 , G11B7/00 , G11B7/0025 , G11B7/09 , G11B7/24 , G11B11/105
CPC分类号： G11B11/10584 , G11B11/10552 , G11B11/10556 , G11B11/10576 , G11B7/0025 , G11B7/24 , G11B7/24003
摘要： An optical memory device includes a cylindrically-shaped optical information recording medium and at least one optical head disposed around the information recording medium for irradiating the information recording medium with a light spot for recording or reproduction of information. The optical head has light spot moving means incorporated therein for the irradiation position of the light spot. The recording or reproduction of information is achieved by causing the light spot moving means to perform tracking control so that the light spot follows a desired track in an area within a range of movement of the light spot by the light spot moving means (or an infromation recording zone) in a state in which the relative positional relationship between the optical head and the cylindrically-shaped information recording medium in the direction parallel to the direction of the rotation axis of the information recording medium is fixed, with the optical head being not moved. The device can be constructed so that the position of either the optical head or the cylindrically-shaped information recording medium relative to the other in the direction parallel to the direction of the rotation axis of the information recording medium is mechanically moved, thereby making it possible to cahnge the information recording zone in the range of movement of the light spot by the light spot moving means to another information recording zone.

45. 发明授权

US5084860A Apparatus for optical disc memory with correction pattern and master disc cutting apparatus 失效
标题翻译：具有校正图案和主光盘切割设备的光盘存储器的设备
公开(公告)号：US5084860A
公开(公告)日：1992-01-28
申请号：US551025
申请日：1990-07-11
申请人： Takeshi Maeda , Yoshito Tsunoda , Kazuo Shigematsu , Toshimitsu Kaku
发明人： Takeshi Maeda , Yoshito Tsunoda , Kazuo Shigematsu , Toshimitsu Kaku
IPC分类号： G11B7/007 , G11B7/09 , G11B7/26 , G11B11/105
CPC分类号： G11B7/261 , G11B11/10565 , G11B11/10578 , G11B11/10582 , G11B7/0901 , G11B7/0938 , G11B7/094 , G11B7/24082
摘要： A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the guide groove are spaced apart from each other in radial directions of the record carrier, and a pit pattern provided between adjacent guide grooves, at positions arranged at intervals in the above rotational direction, for detecting the deviation of a light spot from the center line between adjacent guide grooves. The recording/reproducing operation for this record carrier is performed in such a manner that the first tracking error signal is detected from diffracted light from the guide groove, the second tracking error signal is detected from the pit pattern, and information is recorded in and reproduced from a land formed between adjacent guide grooves in a state that a tracking operation is performed using the first and second tracking error signals. The second tracking error signal detected from the pit pattern is not affected by the tilting of the record carrier and the movement of the light spot. When a tracking signal obtained by adding the first and second tracking error signals to each other, is used in a closed-loop tracking system, a stable tracking operation can be performed. The polarity of the pit pattern is reversed on every track, and hence a polarity pit having a depth of .lambda./4 (where .lambda. indicates the wavelength of a reproducing light beam) is provided in the record carrier, to reverse the polarity of the second tracking signal on every track on the basis of a signal from the polarity pit.

46. 发明授权

US5073880A Information recording/reproducing method and apparatus 失效
标题翻译：信息记录/再现方法和装置
公开(公告)号：US5073880A
公开(公告)日：1991-12-17
申请号：US285584
申请日：1988-12-16
申请人： Takeshi Maeda , Yoshito Tsunoda
发明人： Takeshi Maeda , Yoshito Tsunoda
IPC分类号： G11B7/09 , G11B11/105 , G11B21/10
CPC分类号： G11B7/0938 , G11B11/10565 , G11B11/10578 , G11B21/106
摘要： Data recording and/or reproduction on or from a recording medium on which tracking signal detection marks are intermittently provided along each track in a pattern wobbling alternately across the track center line with a very small lateral displacement therefrom, wherein data recording area is defined between the tracking signal detection mark. A servo control system for controlling a write/read light spot so as to follow the track with the aid of a tracking signal obtained by detecting the tracking signal detection marks is provided with a low-pass filter circuit having a cut-off frequency lower than the frequency at which the tracking signal detection marks are detected. A data is recorded or reproduced on or from the recording areas of the recording medium while following the track under the control of the servo system. A blank area where data recording is inhibited is provided between the data recording area and the tracking signal detecting mark (prepit) to suppress interference to the data. A particular access prepit pattern which allows track addresses to be at least approximately detected upon passing of the light spot over the track of the recording medium is previously provided together with synchronizing marks in a synchronizing area.

47. 发明授权

US5034940A Information retrieval system with a tracking error threshold compensation of retrieved data and tracking error signals 失效
标题翻译：信息检索系统具有检索数据跟踪误差信号的跟踪误差阈值补偿
公开(公告)号：US5034940A
公开(公告)日：1991-07-23
申请号：US162660
申请日：1988-03-01
申请人： Atsushi Saito , Takeshi Maeda
发明人： Atsushi Saito , Takeshi Maeda
IPC分类号： G11B7/005 , G11B7/013 , G11B7/09 , G11B11/105
CPC分类号： G11B7/0901 , G11B11/10578 , G11B11/10595 , G11B7/005 , G11B7/0938 , G11B7/24085
摘要： As an optical spot (20) is scanned along a recording track (B) it interacts with optical markers (14, 16) disposed at regular intervals along adjacent sides of the track. Each interaction with an optical marker causes a peak value which is sampled and held (74, 76). A clock (46) derives a clock signal from the regular periodicity of the optical markers. A logic circuit (48) controls the sample and hold circuits such that the peak amplitude attributable to each optical marker is temporarily held. An adder (52) combines peak values attributable to optical markers on opposite sides of the track to produce a threshold signal (100) indicative of a sum or average thereof. A comparator (58) compares data (56) read from the track with the threshold signal. The comparator indicates a "1" level in response to the data signal exceeding a threshold a "0" level in response to the data signal being below the threshold level. A decoder (60) is clocked by the clock pulses to convert the 1 and 0 indications into a binary pulse train. In this manner, the threshold level which distinguishes between 1's and 0's varies or floats in accordance with the relative interaction of the optical beam and the optical markers on one or the other side of the track, i.e. the misalignment of the optical beam and the track. The threshold signal also varies in accordance with variations in the recording medium.

48. 发明授权

US4969137A Optical recording and reproducing apparatus having a multi-spot positioning control mechanism 失效
标题翻译：具有多点定位控制机构的光记录再生装置
公开(公告)号：US4969137A
公开(公告)日：1990-11-06
申请号：US155697
申请日：1988-02-16
申请人： Hisataka Sugiyama , Takeshi Maeda , Atsushi Saito , Fumio Hara
发明人： Hisataka Sugiyama , Takeshi Maeda , Atsushi Saito , Fumio Hara
IPC分类号： G11B7/085 , G11B7/09 , G11B7/12 , G11B7/14
CPC分类号： G11B7/14 , G11B7/08517 , G11B7/08529 , G11B7/08547 , G11B7/12 , G11B7/0901 , G11B7/0912
摘要： In optically coupling a plurality of light sources to an optical system for focusing light beams from the light sources into spots on a record plane, a center axis of a light beam from a first one of the light sources is aligned to an optical axis of the focusing optical system, and the spots other than a first spot formed by the light beam from the first light source are rotated around the first spot on the record plane to position the spots to the respective target tracks, and a tracking error signal for at least one of the first spot and another spot is detected and the positions of the plurality of spots are integrally controlled based on the detected tracking error signal so that the plurality of spots can follow the respective target tracks. The target tracks to which the spots are to be positioned may be either one track or different tracks. The positioning of the spots to the target tracks may be done either manually or automatically. In the automatic method, a tracking error signal is detected for the first spot, and a deflection mechanism for radially swinging beams from the laser light sources is controlled to control the positions of the spots on the record plane and to cause the first spot to follow the target track.
摘要翻译：在将多个光源光学耦合到用于将来自光源的光束聚焦到记录平面上的光点的光学系统中，来自第一个光源的光束的中心轴线与光源的光轴对齐聚焦光学系统，并且除了由来自第一光源的光束形成的第一光斑之外的光点围绕记录平面上的第一光点旋转，以将光斑定位到各个目标轨道，并且至少跟踪误差信号根据检测到的跟踪误差信号检测第一点和另一个点之一，并且多个点的位置被一体地控制，使得多个点可以跟随相应的目标轨道。斑点要被定位到的目标轨道可以是一个轨道或不同的轨道。斑点到目标轨迹的定位可以手动或自动完成。在自动方法中，对于第一点检测跟踪误差信号，并且控制用于从激光光源径向摆动的光束的偏转机构，以控制记录平面上的点的位置并使第一点跟随目标轨道。

49. 发明授权

US4952787A Method and apparatus for detecting focus error using pits and light beams having astigmatism 失效
标题翻译：使用具有散光的凹坑和光束来检测聚焦误差的方法和装置
公开(公告)号：US4952787A
公开(公告)日：1990-08-28
申请号：US277988
申请日：1988-11-30
申请人： Shigeru Nakamura , Takeshi Maeda
发明人： Shigeru Nakamura , Takeshi Maeda
IPC分类号： G02B7/28 , G11B7/09 , G11B11/105
CPC分类号： G11B11/10578 , G11B11/10576 , G11B7/0908 , G11B7/0909 , G11B7/0912 , G11B7/0917 , G11B7/0938 , G11B7/094 , G11B7/0945
摘要： A light beam which is to be focused onto a recording medium is provided with astigmatism. By focusing the light beam having tghe astigmatism with a focusing lens, two orthogonal focal lines having a circle of least confusion at almost a center position therebetween are formed at remote positions. On the recording medium surface are previously formed two kinds of pits which provide identical modulation to the light beam when the recording medium surface is located at the circle of least confusion position and provide different modulations to the light beam when the recording medium surface is deviated from the circle of least confusion position. The light reflected by the recording medium surface and passed through the focusing lens is detected by at least one photo-detector which is disposed in the reflected light beam flux so as to detect the light amount. The signal modulated by at least one of the two kinds of pits is extracted from the output of the photo-detector to extract from the phase or level of the extracted signal a focus error detection signal which is set to a zero or in-focus point when the recording medium surface is located at the circle of least confusion position between the two focal lines.

50. 发明授权

US4855991A Optical disk having track offset detection areas 失效
标题翻译：具有轨道偏移检测区域的光盘
公开(公告)号：US4855991A
公开(公告)日：1989-08-08
申请号：US10428
申请日：1987-02-03
申请人： Toshimitsu Kaku , Yoshito Tsunoda , Takeshi Maeda , Shigeru Nakamura
发明人： Toshimitsu Kaku , Yoshito Tsunoda , Takeshi Maeda , Shigeru Nakamura
IPC分类号： G11B7/007 , G11B7/09 , G11B7/095 , G11B7/24 , G11B27/30
CPC分类号： G11B27/30 , G11B20/10203 , G11B7/00745 , G11B7/09 , G11B7/094 , G11B7/0956 , G11B2220/2537
摘要： An optical disk having a disk-like substrate and a recording layer provided on the substrate. First and second regions are alternately arranged along a rotational direction of the optical disk. The first region includes a pre-formed optically detectable portion having an address area, and the second region has a guide groove serving as an optical guide for a light spot. A track offset detection area is provided for detecting track offset due to inclination of the optical disk and is disposed with respect to the first region and the second region so that the light spot is not affected by the first region and the second region. The track offset detection area is preferably a mirror portion disposed between the first region and the second region.

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