JPS626651Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a variable resistor for adjusting the sound quality of audio equipment.

Conventionally, low-range and high-range variable resistors have had the disadvantage that their mechanical centers vary electrically, causing undulations rather than being flat. In other words, a center short is used for the low range, and a center open is used for the high range, but the center short for the low range has an insulating part protruding where the resistance part is switched, and is not in a straight line with the slider. For this reason, when the slider moves, it rides on this insulating part, resulting in an instantaneous open state, resulting in noise and level fluctuations. As a countermeasure against this waviness, there is a method in which a separate default switch is provided, but this has the disadvantage of a complicated structure.

The present invention eliminates the drawbacks of the above conventional type.
In particular, the present invention provides a variable resistor which is constructed so that the electrical characteristics are flat at the center of the variable resistor without a default switch, and which is free from noise and level fluctuations.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. In Figures 1 and 2, 1 is a printed wiring board that forms a resistor provided inside the main body of a variable resistor.A shaft hole is provided in the center of the board 1, and a silver foil pattern is formed around it. A common contact end 3 connected to the common terminal 2 is formed, and conductors 8, 9 connected to the left and right terminals 4, 5, respectively, and provided with contact pieces 6, 7 extending alternately in the center are formed on the outside thereof. Further, insulators 10 and 11 are formed on the conductors 8 and 9 so as to hide them, and furthermore, on the upper side of the insulators 10 and 11 are formed a crossover conductor 1 that extends outside of the contact pieces 6 and 7.
2, an arc-shaped resistor 13 is integrally formed.

As shown in FIG. 4, the slider 15 for the resistor 13 and the common contact end 3 has a plurality of notches 1, respectively, so as to contact the contact pieces 6, 7 at the center.
6 into two strips. in this case,
The contact ends 16 of the slider 15 are aligned in a straight line, and the pattern of the central end of the resistor 13 forms inclined portions 17 and 18, respectively, as shown in FIG. , so that the contact ends 17 do not contact the ends of the resistor 13 at the same time when they are located in the same part.

With the above configuration, when the slider 15 is located at the center and slides in either the left or right direction, the contact end 16 moves toward the end of the resistor 13 as shown in FIGS. 3 and 5 during the movement process. When it reaches the position, a part of it rests on the resistor 13 due to the inclined parts 17 and 18, and the other part remains in contact with the contact pieces 6 and 7. As a result, even if there is a protruding portion of the insulator 10, the entire slider 15 will not be cut off at the same time, eliminating electrical variations unlike the conventional type, and eliminating level fluctuations and noise generation. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a resistor board of a variable resistor showing an embodiment of the present invention, Fig. 2 is an exploded explanatory view showing the structure of the same board, and Fig. 3 is a main part of the central part of the resistor. FIG. 4 is a plan view of the main parts of the slider, and FIG. 5 is a side view of the main parts of the resistor and the slider. In the figure, 1 is a printed wiring board, 2 is a common terminal, 3 is a common contact end, 6 and 7 are contact pieces, 8 and 9 are conductors, 10 and 11 are insulators, 13 is a resistor, and 15
is a slider, and 17 and 18 are inclined parts.

Claims (1)

[Scope of utility model registration request] In the center of the rotation range of the slider, contact pieces connected to the left and right terminals are alternately arranged and exposed, and the resistors connected to the left and right terminals are connected to the insulators from the alternately arranged contact pieces. In the resistor arranged through the slider, the slider is formed into a strip shape with a plurality of notches, and the end of the resistor facing the center part is connected to the strip of the slider. A variable resistor characterized by having a shape that is inclined so that the contact pieces are not aligned in a straight line.