JPH041686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a variable resistor using a tubular coil spring slider.

[Summary of the invention] The present invention provides a variable resistor in which a tubular coil spring slider is fitted into a recess of a rotor with its axis oriented parallel to the surface of a resistor support substrate. The slider is constructed by having both end portions of a coil wire constituting the slider protrude in directions opposite to each other, and by respectively locking both end portions of the coil wire in the locking grooves of the rotor. This prevents the rotor from shifting within the recess during operation and stabilizes the electrical characteristics.

[Prior Art] Conventional variable resistors of this type are shown in FIGS. 4 to 7.
As shown in the figure, a disk-shaped rotor 2 and a resistor support substrate 3 are supported in parallel directions in a rectangular case 1 with one end open, and a shaft portion 4 is provided at the center of the surface of the rotor 2. is exposed to the outside through a hole 5 in the upper surface of the case 1, and a cross-shaped operating groove 6 is provided on the end surface of the shaft portion 4. An O-ring 7 is fitted onto the outer periphery of the shaft portion 4, and the casing 1 is in contact with the O-ring 7. A projecting wall 8 is provided on the back surface of the rotor 2,
The projecting wall 8 is provided with a recess 9. A tubular coil spring slider 10 is accommodated in the recess 9 with its axis oriented parallel to the resistor support substrate 3 . Coil spring slider 10
A cushion material 11, such as a rubber plate, is interposed between the bottom of the recess 9 and the bottom of the recess 9. A layer of resistors 12 is provided on the surface of the resistor support substrate 3 in an arc shape so as to be concentric with the center of rotation of the rotor 2 . A portion of the circumferential surface of the coil spring slider 10 is brought into contact with this resistor 12, and slides as the rotor 2 rotates.
An arc-shaped resistor 12 is provided on the surface of the resistor support substrate 3.
A layer of electrodes 13 is provided so as to be located at the center of the electrode 13, and a coil spring slider 10
A part of the circumferential surface of is in contact. Terminals 14 are connected to both ends of the resistor 12 through the resistor support substrate 3, and terminals 15 are connected to the electrodes 13 through the resistor support substrate 3. The opening of the case 1 is closed with resin 16.

[Problems to be solved by the invention] However, in such a structure, since the coil spring slider 10 has a tubular shape, it is unstable and easily rolls when assembled, and there are problems that it is difficult to insert it into the recess 9 of the rotor 2. Ta. Further, there is a problem in that the coil spring slider 10 is not stabilized within the recess 9 when the rotor 2 rotates, and therefore the electrical characteristics are not stabilized. This tendency is particularly strong in the case of ultra-small variable resistors, and it has been considered that the coil spring slider 10 cannot be used in ultra-small variable resistors.

An object of the present invention is to provide a variable resistor in which the coil spring slider can be stabilized within the recess of the rotor and can be easily handled during assembly.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be explained with reference to FIGS. 1 to 3 corresponding to the embodiments. Both end portions 17A of the coil wire 17 constituting the slider 10 are made to protrude in opposite directions from both ends of the slider 10, and these end portions 17A are connected to the rotor 2 that accommodates the slider 10. It is characterized by being locked in the stop groove 18.

[Operation of the invention] In this way, both end portions 17A of the coil wire 17 constituting the coil spring slider 10 are made to protrude in opposite directions from both ends of the slider 10, and these both end portions 17A are connected to the rotor 2. When the slider 10 is locked in the locking groove 18 of the rotor 2, the slider 10 will not move within the recess 9 of the rotor 2 when the rotor 2 rotates. Further, during assembly, the slider 10 does not roll and move.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. In the variable resistor of this embodiment, the tubular coil spring slider 10 has a structure in which both end portions 17A of the coil wire 17 constituting the slider 10 protrude in opposite directions at both ends thereof. There is. The slider 10 is a projecting wall 8 of the rotor 2.
Both end portions 17A of the coil wire 17 are respectively locked in locking grooves 18 provided at both ends of the projecting wall 8 in opposite directions. In other respects, the configuration is similar to that of FIGS. 4 to 7 described above.

Note that the recess 9 and the locking groove 18 may be provided directly on the back surface of the rotor 2 instead of being provided in the projecting wall 8.

[Effect of the invention] As explained above, in the variable resistor according to the invention, both ends of the coil wire constituting the slider are made to protrude in opposite directions from both ends of the tubular coil spring slider. Since both ends of these are locked in the locking grooves of the rotor that accommodates the slider, the slider will not rotate or move within the recess of the rotor when the rotor rotates, and the electrical characteristics will be affected. It can be stabilized. In particular, if both ends of the coil spring slider are made to protrude in opposite directions, the slider will no longer rotate in either the forward or reverse direction around its axis, and the rotor will rotate in either the forward or reverse direction. There is an advantage that the slider does not rotate even if it is rotated. Therefore,
According to the present invention, it is possible to easily provide a highly accurate ultra-small variable resistor that uses a coil spring slider and has good contact performance. Furthermore, if both ends of the coil wire are made to protrude from both ends of the coil spring slider, the slider will not roll and slide during assembly, which will prevent loss and facilitate handling.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a state in which a coil spring slider is assembled to the rotor of a variable resistor according to the present invention, FIG. 2 is a perspective view of a coil spring slider used in the embodiment, Figure 3 is a cross-sectional view of Figure 2, Figures 4, 5, and 6 are a partially cutaway front view, longitudinal sectional view, and bottom view of a conventional variable resistor;
The figure is a cross-sectional view of a conventional slider assembled to a rotor. DESCRIPTION OF SYMBOLS 1... Case, 2... Rotor, 3... Resistor support board, 4... Shaft part, 5... Hole, 8... Projection wall, 9
... Recessed portion, 10 ... Coil spring slider, 1
2...Resistor, 17...Coil wire, 17A...Terminal part, 18...Latching groove.

Claims (1)

[Scope of utility model registration request] A tubular coil spring slider is fitted into the recess of the rotor with its axis oriented parallel to the surface of the resistor support substrate, and a portion of the circumferential surface of the coil spring slider is aligned with the resistor. In a variable resistor that is in contact with the surface of a resistor on a support substrate and slides as the rotor rotates, the coil spring slider has coil wires constituting the slider at both ends thereof. The variable resistor is characterized in that both end portions of the coil wire protrude in opposite directions, and both end portions of the coil wire are respectively locked in locking grooves of the rotor.