公开(公告)号：US4360909A

公开(公告)日：1982-11-23

申请号：US220530

申请日：1980-12-29

申请人： Osamu Tajima

发明人： Osamu Tajima

IPC分类号： G11B9/06 ,  G11B3/12 ,  G11B3/46 ,  G11B21/10 ,  G11B21/20 ,  G11B3/38 ,  G11B11/02 ,  G11B21/00

CPC分类号： G11B3/128 ,  G11B3/125 ,  G11B3/46

摘要： A signal pickup device comprises a reproducing element for reproducing recorded signals from recording tracks of a rotary recording medium, a holder having said reproducing element mounted at its tip end, a cantilever having the rear end of said holder mounted at its tip end, force applying coil for applying a force to the rear end side of the cantilever so that the reproducing element makes contact with the rotary recording medium having a predetermined pressure, and control coils for applying force at the rear end side of the cantilever so that tracking control is performed, by displacing said reproducing element in a direction perpendicular with respect to the longitudinal direction of the recording tracks of the rotary recording medium. The cantilever, holder and reproducing element constructs a cantilever assembly, the holder forms a plate-shaped member in which the width in the direction substantially parallel to the rotating surface of the rotary recording medium is larger than the length in the direction perpendicular to the rotating surface, and the holder and the cantilever assembly have a first resonance frequency respective of their spring constant and moment of inertia wherein said resonance frequency is selected at a frequency lower than a frequency f.sub.c at which the response of the servo loop open loop characteristic of the control means becomes zero. The above cantilever has the first resonance frequency at the plane substantially parallel to the rotating surface of the rotary recording medium selected at a frequency higher than the frequency f.sub.c at the rear end side thereof.

摘要翻译： 一种信号拾取装置，包括一个再现元件，用于从旋转记录介质的记录轨道再现记录信号;一个保持器，其具有安装在其顶端的所述再现元件，悬臂具有安装在其末端的所述保持器的后端， 线圈，用于向悬臂的后端侧施加力，使得再现元件与具有预定压力的旋转记录介质接触;以及用于在悬臂的后端施加力的控制线圈，使得执行跟踪控制 通过相对于旋转记录介质的记录轨迹的纵向垂直的方向移动所述再现元件。 悬臂，保持器和再现元件构成悬臂组件，保持器形成板形构件，其中在大致平行于旋转记录介质的旋转表面的方向上的宽度大于垂直于旋转的方向的方向上的长度 表面，并且保持器和悬臂组件具有其弹簧常数和转动惯量相应的第一共振频率，其中所述谐振频率选择在低于频率fc的频率，在频率fc处，响应于伺服环路开环特性 控制装置变为零。 上述悬臂在基本上平行于旋转记录介质的旋转表面的平面处具有第一共振频率，该旋转记录介质的选择频率高于其后端侧的频率fc。

公开(公告)号：US4280024A

公开(公告)日：1981-07-21

申请号：US68504

申请日：1979-08-22

申请人： Anil R. Dholakia

发明人： Anil R. Dholakia

IPC分类号： G11B3/12 ,  G11B3/44 ,  G11B21/10 ,  G11B3/38

CPC分类号： G11B3/445 ,  G11B21/106 ,  G11B3/128 ,  Y10S358/907

摘要： A stylus assembly for damping impulsive radial motion of the stylus during playback of a grooved video disc record. Included in the stylus assembly is a moment arm perpendicularly attached at the free end of the stylus arm and parallel to the disc record when the stylus is engaged for playback. A mass is mounted to the moment arm to contribute increased inertia to lateral motion of the stylus only in a direction radially across the record. The mass is designed to permit tracking a record groove in the presence of groove eccentricity but to resist motion due to impulsive forces imparted by record defects or particulate matter thereon.

摘要翻译： 一种用于在播放视频光盘记录的过程中阻止触控笔的脉冲径向运动的触笔组件。 触针组件中包括的是在触针接合回放时垂直安装在触针臂自由端并平行于光盘记录的力矩臂。 质量块安装到力臂上，以便仅在径向跨越记录的方向上增加触针的横向运动的增加的惯性。 质量块被设计成允许在存在凹槽偏心的情况下跟踪记录槽，但是抵抗由于记录缺陷或颗粒物质所施加的冲击力的运动。

公开(公告)号：US5585654A

公开(公告)日：1996-12-17

申请号：US782789

申请日：1991-10-24

申请人： Jun-ichi Nishizawa

发明人： Jun-ichi Nishizawa

IPC分类号： G11B3/12 ,  H01L29/10 ,  H01L29/772 ,  H01L29/808

CPC分类号： G11B3/128 ,  H01L29/1066 ,  H01L29/7722

摘要： A field effect transistor has the property that the product of its series resistance and its true transconductance is less than one throughout the entire range of drain voltage in the operative state of the transistor, the series resistance being the sum of the resistance from source to channel and the resistance of this channel. In order to prevent an excessive increase in the active resistance of the channel, the channel is made to have an impurity concentration as low as less than 10.sup.15 atoms/cm.sup.3, preferably less than 10.sup.14 atoms/cm.sup.3, so that the depletion layers extending from the gates grow extensively to become contiguous in response to a small increase in the reverse gate voltage applied. As a result, the field effect transistor of this invention has an unsaturated drain current versus drain voltage characteristic.

摘要翻译： 场效应晶体管具有在晶体管的工作状态下，其串联电阻与其真正跨导的乘积在整个漏极电压范围内小于1的特性，串联电阻是源极与沟道之间的电阻之和 和这个渠道的阻力。 为了防止通道的有效电阻的过度增加，使沟道的杂质浓度低至1015原子/ cm3，优选小于1014原子/ cm3，从而从 栅极响应于施加的反向栅极电压的小的增加而广泛地生长以变得连续。 结果，本发明的场效晶体管具有不饱和漏极电流对漏极电压特性。

公开(公告)号：US4356560A

公开(公告)日：1982-10-26

申请号：US260283

申请日：1981-05-04

申请人： Juniti Ohnishi

发明人： Juniti Ohnishi

IPC分类号： G11B3/12 ,  G11B3/38 ,  G11B21/08 ,  G11B3/36

CPC分类号： G11B3/38 ,  G11B3/128

摘要： A linear-tracking pick-up arm drive assembly for an audio or video disc player, comprising a linear motor including a magnet-carrying movable unit movable on and along a pair of spaced, parallel horizontal guide bars, and a pair of horizontally elongated, stationary armatures positioned below the guide bars, characterized in that the magnet-carrying movable unit has a pick-up arm supported above the movable unit and a permanent magnet projecting downwardly into the opening between the two stationary armatures and further in that the movable unit is supported in weight transmitting relationship on the guide bars by a three-point support mechanism which may include three rollers one of which is rollable on one of the guide bars and the others of which are rollable on the other guide bar.

摘要翻译： 一种用于音频或视频光盘播放器的线性跟踪拾取臂驱动组件，包括线性电动机，其包括可在一对间隔开的平行水平导杆上并沿着一对间隔开的平行水平导杆移动的磁体承载活动单元，以及一对水平伸长的， 固定电枢定位在导杆下方，其特征在于，所述携带磁体的可移动单元具有支撑在可移动单元上方的拾取臂和向下突出到两个固定电枢之间的开口中的永磁体，并且进一步的可移动单元是 通过三点支撑机构支撑在导杆上的重量传递关系，三点支撑机构可以包括三个辊，其中一个辊可以在一个导杆上滚动，而另一个在另一个导杆上可滚动。

公开(公告)号：US4445210A

公开(公告)日：1984-04-24

申请号：US273416

申请日：1981-06-15

申请人： Kengo Adachi

发明人： Kengo Adachi

IPC分类号： G11B3/085 ,  G11B3/12 ,  G11B17/00

CPC分类号： G11B3/08516 ,  G11B3/08506 ,  G11B3/08583 ,  G11B3/127 ,  G11B3/128

摘要： In a tone arm elevating mechanism, an elevator, which is arranged to raise and lower the tone arm, is driven by a solenoid, and the mechanism comprises a first rotary lever contactable with a portion of the elevator and a second rotary lever arranged to be driven by the solenoid, where the second rotary lever is operatively linked with the first rotary lever by means of an elastic member which prevents transmission of shock. Thus, the reciprocating movement of the solenoid is converted into rotational force to cause the elevator to rise gently and slowly. A viscous and resistive material may be provided to the elevator so that the elevator slowly lowers when the solenoid is deenergized. A portion of the elevating mechanism functions as an electrical switch to detect the highest position of the tone arm, while another portion may also function as another switch to detect the fact that the stylus has been placed on the record disk. The information from these switches may be fed to a circuit which controls various operations of the tone arm, thereby control of horizontal movement of the tone arm as well as antiskating can be accurately and precisely performed.

摘要翻译： 在音臂升降机构中，升降音调臂的升降机由螺线管驱动，该机构包括与电梯的一部分相接触的第一旋转杆和设置成 由螺线管驱动，其中第二旋转杆通过防止冲击传播的弹性构件与第一旋转杆可操作地连接。 因此，螺线管的往复运动转换成旋转力，使电梯缓慢而缓慢地升高。 可以向电梯提供粘性和电阻材料，使得当螺线管断电时电梯缓慢降低。 升降机构的一部分用作电开关以检测音调臂的最高位置，而另一部分还可以用作另一开关，以检测触笔已被放置在记录盘上的事实。 来自这些开关的信息可以被馈送到控制音调臂的各种操作的电路，从而可以准确和精确地执行调音臂的水平移动以及防滑。

公开(公告)号：US4121837A

公开(公告)日：1978-10-24

申请号：US804818

申请日：1977-06-08

申请人： Noboru Tominari ,  Hiroshi Takahashi

发明人： Noboru Tominari ,  Hiroshi Takahashi

IPC分类号： G11B3/12 ,  G11B3/10

CPC分类号： G11B3/128

摘要： A record player comprises a tone arm provided at the distal end thereof with a pickup cartridge, and a vibration damping device for damping a resonance of the tone arm. The damping device comprises a damping member made of an electrically conductive material and provided at the tone arm in a manner to vibrate unitarily therewith, and a damping unit inclusive of permanent magnet means for forming a magnetic field with respect to the damping member. Eddy currents are generated in the damping member when the damping member vibrates in the magnetic field, whereby damping of the vibration of the damping member and the tone arm is accomplished. The damping device may further comprise an elastic member supported at one end thereof at the tone arm and having another free end and a weight secured to the free end of the elastic member.

摘要翻译： 记录播放器包括在其远端设置有拾取盒的色调臂，以及用于阻尼色调臂的共振的减振装置。 阻尼装置包括由导电材料制成的阻尼构件，并以与其整体振动的方式设置在音臂上，以及阻尼单元，其包括相对于阻尼构件形成磁场的永久磁铁装置。 当阻尼构件在磁场中振动时，在阻尼构件中产生涡流，由此实现阻尼构件和调音臂的振动的阻尼。 阻尼装置还可包括弹性件，弹性件在其一端支撑在音臂上，并具有另一自由端和固定在弹性件自由端上的配重。

公开(公告)号：US4102536A

公开(公告)日：1978-07-25

申请号：US723588

申请日：1976-09-15

申请人： Kenneth Clunis

发明人： Kenneth Clunis

IPC分类号： G11B3/12 ,  G11B3/10

CPC分类号： G11B3/128

摘要： An improved phonograph pickup device having a pivotally mounted tone arm on which a drive coil and a sense coil are mounted and are coupled to a magnetic field. The level of current flow to the drive coil alters its position relative to the magnetic field. A cueing control circuit is connected for providing feedback controlled energization of the drive coil whereby damped movement of the tone arm is provided when it moves relative to the record disc. The sense coil is connected in the control circuit to provide a feedback signal for the circuit that is proportional to the velocity of the movement of the tone arm. The device also includes a cartridge responsive to both static and dynamic forces exerted between the cartridge and the record disc. The cartridge is connected as a part of a force control circuit which also provides feedback controlled current flow through the drive coil. When the cartridge is lowered into contact with a record disc, the force control circuit portion is operative to establish a preset force level between the cartridge and the record disc and by force feedback corrects for cartridge displacement forces represented by frequencies below the audio range, such as those presented by record warpage. The output of the cartridge is proportional to the force level present between the cartridge and the record disc surface. This output is feed back to the force control circuit. This circuit also provides a reference signal which establishes the preset force level and which is applied to a phase correction network including an amplifier, the output of which establishes the level of current flow to the drive coil. A control selection circuit coupled to the force control and the cueing control circuits selects the cueing control circuit to control the energization of the drive coil in response to an up or down cueing signal and selects the force control circuit to control the energization of the drive coil when the force level between the cartridge and the record disc is at least half of the desired force level.