JPS6223047Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable resistor, and more particularly to a type of variable resistor whose resistance value can be adjusted by adjusting the position of a slider on an elongated resistor.

This type of variable resistor is used, for example, as an element of the operation control mechanism of electronic equipment such as audio equipment, by being attached to the operation panel of the equipment. In order not to damage the appearance of the operation panel, one conventional example of this type of variable resistor has a slider that is in slidable contact with the resistor and an electrically insulating material connected to the slider. A good-looking plate-like member, that is, a decorative board, is interposed between the knob member and the resistor and slider are covered by this decorative board and cannot be seen from outside the device. It's becoming like that. In a conventional variable resistor having such a decorative plate, the point of application of the force applied by the operator to the knob member to move the slider has a higher resistance than in the case where the decorative plate does not exist. It exists at a position further away from the point of contact between the body and the slider, that is, the position where frictional force occurs. Therefore, although the conventional variable resistor with such a decorative plate has a good appearance, as mentioned above, the point of force application and the position where the frictional force is generated are quite far apart, so the knob member cannot be used. When operated, the knob member tilts in the direction of movement, and the movement is not smooth, resulting in an unpleasant feeling of operation.

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a variable resistor of the above type having a decorative plate configured to allow smooth movement of the knob member and the slider connected thereto.

For this purpose, in the variable resistor of the present invention, the knob member extends through a long hole in the decorative plate parallel to the resistor, and the knob member is inserted between the decorative plate and the resistor. A bar-shaped guide member is provided which fits and smoothly guides the knob member parallel to the resistor.

Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a variable resistor according to an embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views taken along lines - and - in FIG. 1, respectively.

This variable resistor is, for example, a part 1 of an operation panel of an electronic device (not shown) such as an audio amplifier.
A rod-shaped resistor 14 with a rectangular cross section is fixed to the back surface of the resistor 0 by a suitable means such as a screw 12. The resistor 14 is connected to an electrical circuit within the device by suitable means not shown. The front panel 16 has a screw 18 engaged at one end thereof;
It is held on the operation panel 10 by a protrusion 20 formed at the other end and engaged with a hole in the operation panel 10. An opening 22 is formed in a portion of the operation panel 10 facing the resistor 14 along the longitudinal direction of the resistor 14 . A slider 24 connected to an electrical circuit within the electronic device by suitable means (not shown) is mounted at one end of a knob member 28 within a space 26 defined by the operating panel 10 and the front panel 16. and is in contact with one side of the resistor 14 through the hole 22. A decorative plate 30 made of, for example, plastic is arranged in the space 26 parallel to the resistor 14. Both ends of the decorative board 30 are secured by screws 32.
A protrusion 34 formed on the back surface of the front panel 16
is fixed to.

The knob member 28 is a substantially cylindrical member made of an electrically insulating material such as plastic, and has a hole 36 with a rectangular cross section in the center. Two elongated holes 38 parallel to the resistor 14 are formed in the decorative board 30 , and the two opposing parallel side walls 40 of the knob member 28 are inserted into the elongated holes 38 . A central portion defined by elongated hole 38 extends through hole 36 in knob member 28 . One end H of the knob member 28 projects out of the space 26 from a rectangular hole 42 formed in the front panel 16 parallel to the resistor 14 .

The position and dimensions of the decorative board 30 are set so that the interior thereof cannot be seen through the hole in the front panel 16.

In order to guide the knob member 28 parallel to the resistor 14, a cylindrical guide member 44 is arranged between the decorative plate 30 and the resistor 14. Guide member 44
has both ends supported by the protrusions 46 of the decorative board 30 and fitted into the holes of the knob member, and the knob member 28 supports the slider 24 which is in slidable contact with the resistor 14. It is guided by this guide member 44 and can move parallel to the resistor 14. A pair of projections 48 provided on the knob member 28 fit into the holes 4 of the front panel 16, as shown in FIG.
2 and prevents the knob member 28 from swinging around the guide member 44. Knob member 2
In order to suppress the frictional force that acts on the contact surface of the guide member 8 and the guide member 44,
A lubricant such as grease can be applied to the guide member 44.

Similar to the conventional variable resistor having a decorative plate, the variable resistor of the present invention requires space to arrange the decorative plate, so the head H of the knob member 28, that is, the part to which force is applied by the operator, and the knob The distance between the sliding surface of the slider 24 fixed to the inner end of the member 28, that is, the surface in contact with the resistor 14, is quite large. Therefore, in conventional variable resistors, when force is applied to the knob member, a relatively large torque is generated around the contact point between the slider and the resistor, and the knob member becomes irregular due to the torque. There was a problem in that smooth movement of the knob member was hindered due to rocking in the direction of movement. However, in the case of the variable resistor of the present invention, the decorative plate 3
Since a guide member 44 that supports and guides the knob member is provided between 0 and the resistor 14, the knob member can be moved smoothly and the position of the slider can also be finely adjusted. It is.

In the illustrated embodiment, the resistor 14 is fixed to the operation panel of a device such as an audio amplifier, but the resistor, knob member, decorative plate, and guide member may be housed in a separate housing from the device. Needless to say, it can also be stored.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a variable resistor according to an embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views taken along the - line and - line of the resistor in FIG. 1, respectively. Explanation of symbols of main parts, 14...Resistor, 24...
Slider, 28... Knob member, 30... Decorative board, 44
...Guide member.

Claims (1)

[Scope of utility model registration request] an elongated resistor extending along a hole formed in a front panel; a plate-like member having an elongated hole parallel to the resistor and disposed opposite to the resistor and behind the hole; A slider to be slid on the resistor is supported at one end and extends through the elongated hole, and the other end protrudes to the opposite side of the plate-shaped member to the side facing the resistor. a variable resistor comprising an electrically insulating knob member, the unit being fitted with the knob member between the resistor and the plate-like member and guiding the knob member parallel to the resistor; 1. A variable resistor comprising a rod-shaped guide member, the knob member slidingly contacting an edge of a hole in the front panel.