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    • 36. 发明授权
    • Positioning control system including a servo-error signal generating
circuit
    • 定位控制系统包括伺服误差信号发生电路
    • US5930212A
    • 1999-07-27
    • US946681
    • 1997-10-08
    • Akira MinamiShigeyoshi TanakaMichio MatsuuraHiromichi KuwanoKazuyuki Tamanoi
    • Akira MinamiShigeyoshi TanakaMichio MatsuuraHiromichi KuwanoKazuyuki Tamanoi
    • G11B7/09G11B11/105H03G3/30G11B7/095
    • H03G3/3084G11B11/10576G11B7/0941G11B7/0943
    • A positioning control system for performing recording/reproducing operations by irradiating an optical beam to a predetermined position on an optical recording medium, includes a photo-detector and a servo-error signal generating circuit which can generate at least one servo-error signal in accordance with a difference between the detection currents. Preferably, the servo-error signal generating circuit includes at least one division circuit having two pairs of transistors, two emitters in each pair of transistors being connected together into a common emitter, bias voltages of direct current type being applied to the respective bases of transistors on one side, the respective collectors of the transistors on one side being connected to a common connecting portion via resistors, the common connecting portion being connected to a power supply, the respective bases of transistors on the other side being connected together into a common base; and an integrating capacitor which is connected to the common base of transistors on the other side, and which integrates a difference between the current flowing through the common connecting portion and the reference current, to apply the thus integrated difference to the common base of transistors on the other side.
    • 一种用于通过将光束照射到光学记录介质上的预定位置来执行记录/再现操作的定位控制系统包括光电检测器和伺服误差信号发生电路,该电路可以根据产生至少一个伺服误差信号 检测电流之间有差异。 优选地,伺服误差信号发生电路包括至少一个具有两对晶体管的分频电路,每对晶体管中的两个发射极连接在一起成共同的发射极,直流型偏置电压施加到晶体管的各个基极 一方面,一侧的晶体管的集电极通过电阻器连接到公共连接部分,公共连接部分连接到电源,另一侧的晶体管的各个基极连接在一起成共同的基极 ; 以及积分电容器,其连接到另一侧的晶体管的公共基极,并且将流过公共连接部分的电流与参考电流之间的差积分,以将这样的积分差施加到晶体管的公共基极上 另一边。
    • 37. 发明授权
    • Process for preparing isochroman compounds
    • 异苯并二氢吡喃化合物的制备方法
    • US5912362A
    • 1999-06-15
    • US945798
    • 1997-11-10
    • Shigeyoshi TanakaMasayuki OkuJunji Koshino
    • Shigeyoshi TanakaMasayuki OkuJunji Koshino
    • B01J27/10C07B61/00C07D311/76C07D311/78C07D311/92
    • C07D311/76C07D311/78
    • High-purity isochroman compounds can be obtained in high yields according to a simple and economical process for preparing isochroman compounds, comprising the step of adding an aquesous solution of formaldehyde having a concentration of 40 to 70 wt. % to a complex of an arylalkanol represented by the following general formula (II) with a Friedel-Crafts catalyst to cyclize the arylalkanol: ##STR1## wherein R.sub.1 and R.sub.2 each stands for a hydrogen atom, a lower alkyl group or a lower alkoxyl group, or alternatively R.sub.1 and R.sub.2 are respectively bonded to adjacent carbon atoms with mutual bonding of R.sub.1 and R.sub.2 together with the carbon atoms respectively bonded to R.sub.1 and R.sub.2 to form a benzene ring, a naphthalene ring, or a C.sub.5 or C.sub.6 cycloalkane or cycloalkene which may have 1 to 6 lower alkyl groups; and R.sub.3 stands for a hydrogen atom or a lower alkyl group.
    • PCT No.PCT / JP96 / 01088 Sec。 371日期:1997年11月10日 102(e)日期1997年11月10日PCT 1996年4月22日PCT PCT。 公开号WO96 / 35684 日期1996年11月14日根据制备异苯并二氢吡喃化合物的简单和经济的方法,可以高产率获得高纯度异苯并二氢吡喃化合物,其包括加入浓度为40-70重量%的甲醛水溶液的步骤。 %与由以下通式(II)表示的芳基烷醇与Friedel-Crafts催化剂的络合物,使芳基烷醇环化:其中R 1和R 2各自代表氢原子,低级烷基或低级烷氧基,或者另外 R1和R2分别与相邻的碳原子键合,R1和R2与分别键合到R1和R2的碳原子相互键合形成苯环,萘环或C5或C6环烷烃或环烯烃,其可以具有1个 至6个低级烷基; R3表示氢原子或低级烷基。
    • 39. 发明授权
    • Positioning control system utilizing optical beam having servo-error
signal generating circuit
    • 利用具有伺服误差信号发生电路的光束的定位控制系统
    • US5636191A
    • 1997-06-03
    • US421226
    • 1995-04-13
    • Akira MinamiShigeyoshi TanakaMichio MatsuuraHiromichi KuwanoKazuyuki Tamanoi
    • Akira MinamiShigeyoshi TanakaMichio MatsuuraHiromichi KuwanoKazuyuki Tamanoi
    • G11B7/09G11B11/105H03G3/30
    • H03G3/3084G11B11/10576G11B7/0941G11B7/0943
    • A positioning control system for performing recording/reproducing operations by irradiating an optical beam to predertermined position on an optically recording medium, e.g., magneto-optical disk, includes a photo-detector constituted by at least two-divisional units; and a servo-error signal generating circuit which can generate at least one servo-error signal in accordance with a difference between the detection currents. Preferably, servo-error signal generating circuit includes at least one division circuit that has two pairs of transistors, two emitters in each pair of transistors being connected together into a common emitter, bias voltages of direct current type being applied to the respective bases of transistors on one side, the respective collectors of the transistors on one side being connected to a common connecting portion via resistors, the common connecting portion being connected to a power supply, the respective bases of transistors on the other side being connected together into a common base; and an integrating capacitor which is connected to the common base of transistors on the other side, and which integrates a difference between the current flowing through the common connecting portion and the reference current, to apply the thus integrated difference to the common base of transistors on the other side. Further, preferably, the photo-detector is connected to the common emitters in the respective pairs of transistors, so that the detection currents can flow through the common emitters.
    • 用于通过将光束照射到光学记录介质例如磁光盘上的预先定位的位置进行记录/再现操作的定位控制系统包括由至少两分割单元构成的光检测器; 以及可以根据检测电流之间的差产生至少一个伺服误差信号的伺服误差信号发生电路。 优选地,伺服误差信号发生电路包括至少一个具有两对晶体管的分频电路,每对晶体管中的两个发射极连接在一起成为共发射极,直流型偏置电压施加到晶体管的各个基极 一方面,一侧的晶体管的集电极通过电阻器连接到公共连接部分,公共连接部分连接到电源,另一侧的晶体管的各个基极连接在一起成共同的基极 ; 以及积分电容器,其连接到另一侧的晶体管的公共基极,并且将流过公共连接部分的电流与参考电流之间的差积分,以将这样的积分差施加到晶体管的公共基极上 另一边。 此外,优选地,光检测器连接到各对晶体管中的公共发射极,使得检测电流可以流过公共发射器。
    • 40. 发明授权
    • Control apparatus of laser diode
    • 激光二极管控制装置
    • US5276671A
    • 1994-01-04
    • US881501
    • 1992-05-11
    • Akira MinamiShigeyoshi Tanaka
    • Akira MinamiShigeyoshi Tanaka
    • G11B7/00G11B7/0045G11B7/005G11B7/125H01S5/042
    • G11B7/126
    • A laser diode having a cathode connected to the ground side of a positive power source and an anode connected to the plus voltage side of the power source through a control circuit. A maximum current to drive the laser diode is supplied to the laser diode by a disgorging type constant current source. In a reading mode operated at a frequency one or more digit higher than a frequency for writing data, a differential current between the write current and a read current is sucked from the disgorging type constant current source by a sucking type constant current source, thereby allowing the read current to flow into the diode. In a writing mode, a current switch connects the sucking type current source according to write data. The disgorging type current source and the sucking type current source are connected to a photodiode by a current switch. An APC responds to the photodiode which detects a read power, thereby reducing a laser fluctuation created from temperature change.
    • 激光二极管,其具有连接到正电源的接地侧的阴极和通过控制电路连接到电源的正电压侧的阳极。 驱动激光二极管的最大电流通过散射型恒流源提供给激光二极管。 在以比写入数据的频率高一个或多个数字的频率下操作的读取模式中,通过吸取式恒流源从分离型恒流源吸取写入电流和读取电流之间的差分电流,从而允许 读取电流流入二极管。 在写入模式下,电流开关根据写入数据连接吸引型电流源。 散流型电流源和吸引型电流源通过电流开关连接到光电二极管。 APC响应于检测读取功率的光电二极管,从而减少由温度变化引起的激光波动。