JPH04133401U - Motor-driven rotary variable resistor - Google Patents

Abstract

(57) [Summary] [Purpose] Separately from the first earth plate for the variable resistor,
A second ground plate for the motor is provided to prevent noise generated from the motor side from entering the variable resistor side. [Structure] The metal cover 5 that covers the open surface of the metal casing 3 housing mechanical parts is used as the first ground plate on the variable resistor 1 side, and the first insulating spacer 17, the first ground plate 5, and the second
The insulating spacer 19 and the second ground plate 21 are superposed,
A metal screw 15 is screwed into the front surface of the metal case 8a of the motor 8 through the mounting holes 18, 16, 20, 22 of each member, and the first and second ground plates 5, 21 are connected to the second insulating spacer. 19, and the diameter of the mounting hole 16 of the first ground plate 5 is larger than the diameter of the screw 15 to prevent contact.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention eliminates electrical and magnetic noise generated on the variable resistor side and noise generated on the motor side. Motor-driven rotating type that can eliminate noise induced to the resistor side. Regarding variable resistors.

0002

[Conventional technology]

FIG. 3 is a front view of a conventional motor-driven rotary variable resistor. In the drawing, 1 is a rotary variable resistor, 2 is a rotating shaft, and 3 is a rotary variable resistor 1. It is attached to the rear surface of the frame 4 made of insulating material and houses mechanical parts such as reduction gears. A metal housing 5 is a metal cover that covers the open surface of the housing 3, and a metal cover 5 is provided at the bottom of the cover 5. A ground terminal 5a is formed thereon and also serves as a first ground plate. 6 is the front plate, A bearing 7 is integrally formed. 8 is a motor fixed to the rear surface of the first ground plate 5. This motor-driven rotary variable resistor is manufactured by screwing a nut 9 into the bearing 7. The terminal 11 of the variable resistor 1 is connected to the printed circuit board 1. The ground terminal 5a is soldered to the wiring pattern 13 of the printed circuit board 1. It is electrically connected to the second ground pattern 14.

0003

[Problem that the idea aims to solve]

By the way, in the above motor-driven rotary variable resistor, the ground plate of the motor 8 is It is shared with the first ground plate 5 of the variable resistor 1, and therefore the drive of the motor 8 At times, noise emitted from the motor 8 side is transmitted to the variable resistor 1 side via the first ground plate 5. There is a problem in that it jumps into the sound and causes deterioration of the acoustic characteristics.

0004 The present invention attempts to solve the conventional problems as mentioned above, and the present invention The purpose of this is to prevent the noise generated from the motor side from jumping into the variable resistor side when the motor is driven. Motor-driven rotary type that does not deteriorate acoustic characteristics even when driven by a motor. It is intended to provide a variable resistor.

[0005]

[Means to solve the problem]

In order to achieve the above purpose, this invention has a reduction tooth at the rear stage of the rotary variable resistor. A metal casing that houses mechanical parts of a car, etc., and a motor are stacked on top of each other, and the open surface of the casing is covered. In a motor-driven rotary variable resistor with a metal cover as the first ground plate, the front A second ground plate insulated from the first ground plate is fixed to the front surface of the motor. It has a configuration.

[0006]

[Effect]

According to the present invention, the noise on the motor side is grounded separately from the first ground plate on the variable resistor side. Since a second ground plate is provided to release the noise, noise generated from the motor side is possible. There is no jumping into the resistor side. Therefore, deterioration of acoustic characteristics during motor drive is prevented. can be stopped.

[0007]

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. Figures 1 and 2 are explanatory diagrams of an embodiment of the present invention, and Figure 1 shows a partially broken motor drive. FIG. 2 is a front view of the rotary variable resistor, and FIG. 2 is an enlarged sectional view of the main part of FIG.

[0008] In FIG. 2, the metal cover 5 of the metal casing 3 also serves as the first ground plate, and A ground terminal 5a is provided at the end and has a diameter larger than the diameter of the metal screw 15. A mounting hole 16 is provided. 17 is superimposed on the front surface of the first ground plate 5. The first insulating spacer 17 has a diameter substantially the same as the diameter of the screw 15. A mounting hole 18 is provided. 19 is superimposed on the rear surface of the first earth plate 5. A second insulating spacer is provided, and the spacer 19 has a diameter that is approximately the same as the diameter of the screw 15. A mounting hole 20 of a diameter is provided. 21 is a metal part attached to the front of the motor 8 A second metal grounding plate on the motor 8 side of the A diameter mounting hole 22 is provided, and a ground terminal 21a is provided at the lower end.

[0009] The second ground plate 21 is attached to the first insulating spacer as shown in FIG. 17, the first earth plate 5, the second insulating spacer 19, and the second earth plate 21 are connected to the motor metal screws 15 into each of the mounting holes 18, 16, 20 of the member. , 22 and screwed into the front surface of the metal case 8a of the motor 8. Ru. According to the embodiment described above, the first earth plate 5 and the second earth plate 21 are 2 through the insulating spacer 19, and the mounting hole 16 of the first ground plate 5. The diameter of the first ground plate is set larger than the diameter of the screw 15 in advance. 5 and the second ground plate 21 are provided independently and insulated from each other.

0010 Note that the ground terminal 21a of the second ground plate 21 is connected to the ground terminal 21a of the first ground plate 5. Similarly to the ground terminal 5a, the ground pattern 14 on the printed circuit board 12 is soldered. It will be done. Note that 8b is a rotating shaft of the motor 8.

[0011] As described above, according to the present invention, the second ground plate 21 of the motor 8 is connected to the variable resistor. Since it is provided separately and insulated from the first ground plate 5 of the resistor 1, when the motor 8 is driven, Even if noise occurs on the motor 8 side, this noise is transmitted through the second ground plate 21. It will not run away and jump into the variable resistor 1 side.

0012 Therefore, even when the motor 8 is driven, the acoustic characteristics do not deteriorate.

[0013]

[Effect of the idea]

According to the present invention, the first earth plate on the variable resistor side is A second ground plate on the motor side is provided, so even if noise occurs when the motor is driven, This noise will not jump into the variable resistor side. Therefore, when driving the motor It also has the effect that the acoustic characteristics do not deteriorate.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a motor-driven rotary variable resistor of the present invention.

FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1;

FIG. 3 is a front view of a conventional motor-driven rotary variable resistor.

[Explanation of symbols]

3 Housing 5 First earth plate (cover) 8 motor 21 Second earth plate

Claims (1)

[Scope of utility model registration request] 1. A motor in which a metal casing housing mechanical parts such as a reduction gear and a motor are stacked at the rear stage of a rotary variable resistor, and a metal cover covering the open surface of the casing is used as a first grounding plate. A motor-driven rotary variable resistor, characterized in that a second ground plate insulated from the first ground plate is fixed to the front surface of the motor.