公开(公告)号：US3924171A

公开(公告)日：1975-12-02

申请号：US39517573

申请日：1973-09-07

Applicant: RICOH KK

Inventor： UKAI TAKESHI ,  YAESHIMA MASAO ,  WATANABE KIMIO

IPC: G05D3/12 ,  G03B27/32 ,  G05B11/06 ,  H02P7/00 ,  G05B1/06 ,  G05F1/00

CPC classification number: H02P7/05

Abstract: A control circuit for controlling the rotation of a servo motor comprises a high gain differential amplifier for producing an output corresponding to the difference between a voltage output from a first potentiometer which moves with the servo motor and a voltage output from a second potentiometer which provides a setting for the angle of rotation of the servo motor. The control circuit further includes a high sensitivity switching circuit including programmable unijunction transistors for detecting the output from the differential amplifier to effect rotation of the servo motor in a forward or reverse direction.

Abstract translation: 用于控制伺服电动机的旋转的控制电路包括高增益差分放大器，用于产生对应于从伺服电动机移动的第一电位计输出的电压与从第二电位器输出的电压之间的差的输出， 设定伺服电机的旋转角度。 控制电路还包括高灵敏度开关电路，其包括用于检测来自差分放大器的输出的可编程单结晶体管，以在正向或反向方向上实现伺服电动机的旋转。

公开(公告)号：US3884576A

公开(公告)日：1975-05-20

申请号：US42132473

申请日：1973-12-03

Applicant: RICOH KK

Inventor： MOCHIMARU HIDEAKI ,  SUZUKI SHIGERU ,  IKEZU YOHEI ,  YAESHIMA MASAO ,  UKAI TAKESHI

IPC: G03B27/72 ,  G03G15/04 ,  G03G15/041 ,  G03B27/76

CPC classification number: G03G15/04036 ,  G03B27/722 ,  G03G15/041

Abstract: In a copying machine having a variable magnification, a plurality of light sources are used to provide an exposure. By controlling the respective timer periods during which the plurality of light sources are energized, the distribution of the exposure is maintained uniform.