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1. 外观设计

USD297137S Telephone set 失效
公开(公告)号：USD297137S
公开(公告)日：1988-08-09
申请号：US890698
申请日：1986-07-28
申请人： Ludwig Richter , Dieter Kraemer , Helmut Mayer , Hajo von Reyer , Wolfgang Girscher , Gerhard Sussner , Karl-Heinz Niederhoefer
设计人： Ludwig Richter , Dieter Kraemer , Helmut Mayer , Hajo von Reyer , Wolfgang Girscher , Gerhard Sussner , Karl-Heinz Niederhoefer

2. 外观设计

USD294351S Telephone set 失效
公开(公告)号：USD294351S
公开(公告)日：1988-02-23
申请号：US890697
申请日：1986-07-28
申请人： Ludwig Richter , Dieter Kraemer , Helmut Mayer , Hajo von Reyer , Wolfgang Girscher , Gerhard Sussner , Karl-Heinz Niederhoefer
设计人： Ludwig Richter , Dieter Kraemer , Helmut Mayer , Hajo von Reyer , Wolfgang Girscher , Gerhard Sussner , Karl-Heinz Niederhoefer

3. 外观设计

USD294248S Telephone set 失效
公开(公告)号：USD294248S
公开(公告)日：1988-02-16
申请号：US890695
申请日：1986-07-28
申请人： Ludwig Richter , Dieter Kraemer , Helmut Mayer , Hajo von Reyer , Wolfgang Girscher , Gerhard Sussner , Karl-Heinz Niederhoefer
设计人： Ludwig Richter , Dieter Kraemer , Helmut Mayer , Hajo von Reyer , Wolfgang Girscher , Gerhard Sussner , Karl-Heinz Niederhoefer

4. 发明授权

US4790007A Telephone instrument 失效
标题翻译：电话乐器
公开(公告)号：US4790007A
公开(公告)日：1988-12-06
申请号：US6938
申请日：1987-01-23
申请人： Ludwig Richter , Karl H. Niederhofer , Dieter Kramer , Gerhard Sussner , Wolfgang Girscher , Volker Munch , Heinrich Vial , Helmut R. Mayer , Hayo Reyher
发明人： Ludwig Richter , Karl H. Niederhofer , Dieter Kramer , Gerhard Sussner , Wolfgang Girscher , Volker Munch , Heinrich Vial , Helmut R. Mayer , Hayo Reyher
IPC分类号： H04M1/02
CPC分类号： H04M1/0295
摘要： A telephone instrument is designed in the shape of an angle, whereby the upper side has a steeper inclination towards the user. The rear wall is at approximately a right angle to the upper side. The bottom side runs at a specific distance, parallel to the upper side and to the rear wall. Since the distance between the upper side and the bottom side is not very great, i.e. since a maximum of only two printed circuit boards can be accommodated one on top of the other in this space, the bottom side below the upper side has a trough which serves both to accommodate an additional printed circuit board and to provide cable entries. This trough does not extend over the total width of the telephone instrument but is narrower. In order to expand the keyboard, one part of the upper side can be moved in the longitudinal direction, away from the user, so that an additional keyboard or indicator device below it is made available.
摘要翻译：电话乐器被设计成角度的形状，由此上侧朝向使用者倾斜更陡峭。后壁与上侧大致成直角。底面平行于上侧和后壁延伸一定距离。由于上侧和下侧之间的距离不是非常大，即由于在该空间中最多只能容纳两个印刷电路板，所以上侧的下侧可以具有槽，用于容纳另外的印刷电路板并提供电缆入口。该槽不延伸超过电话乐器的总宽度，但较窄。为了扩展键盘，上侧的一部分可以在纵向方向上移动，远离用户，使得其下方的附加键盘或指示器装置可用。

5. 发明授权

US4658194A Closed loop control circuitry for step motors 失效
标题翻译：用于步进电机的闭环控制电路
公开(公告)号：US4658194A
公开(公告)日：1987-04-14
申请号：US697567
申请日：1985-02-01
申请人： Ludwig Richter , Werner Siefert , Hans-Jorg Kleis
发明人： Ludwig Richter , Werner Siefert , Hans-Jorg Kleis
IPC分类号： H02P8/14 , H02P8/22 , H02P8/32 , H02P8/00
CPC分类号： H02P8/32 , H02P8/14 , H02P8/22
摘要： Control circuitry for a self-synchronously driven step motor under closed loop control includes, for determining the rotor position, a technologically simplified back EMF waveform detector circuit which includes fewer than five operational amplifiers, and preferably only one operational amplifier, and which delivers, for each motor phase, a back EMF signal and the negative thereof. Use can be made of these signals individually or in various combinations, with the aid of a back EMF selector arrangement and an adder connected thereto, for controlling the stator field. By sum and difference formation of back EMF signals by the adder and by assigning such signals each to a respective energization state of the motor phases, the rotor can be moved by half-steps as well as full-steps, to provide a finer degree of control. Additionally it is possible with such circuitry to detect the end position of the rotor and its maximum degree of overrunning, which yield values that can be used for achieving desired damping of the rotor.
摘要翻译：用于闭环控制下的自同步驱动的步进电动机的控制电路包括用于确定转子位置的技术上简化的反电动势波形检测器电路，其包括少于五个运算放大器，并且优选仅包括一个运算放大器，并且其提供用于每个电动机相位，反电动势信号及其负极。借助于反电动势选择器装置和与其连接的加法器，可以单独或以各种组合来使用这些信号，以控制定子磁场。通过加法器对反电动势信号的和和差分形成，并且通过将这些信号分配给电动机相的各自的通电状态，转子可以通过半步以及全步进行移动，以提供更精细的程度控制。另外，这种电路可以检测转子的最终位置和其最大超越度，其产生可用于实现转子所需阻尼的值。

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