JPH0432723Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a two-set variable resistor used in small consumer equipment, etc., and in particular to an extremely small (for example, an outer diameter of 8 mm) rotary-type two-set variable resistor. It is.

Recently, there has been a growing trend towards ultra-compact and ultra-thin consumer equipment such as radios and tape recorders. There is also a growing demand for resistors that are extremely small and of a multiple type.

The present invention meets the above requirements.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The drawings are all related to the present invention; FIG. 1 is a perspective view showing a small rotary variable resistor, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is a sectional side view of the same. In the figure, reference numeral 1 denotes a mounting plate made of a single metal material, and the mounting plate 1 includes a plate body 1a, a shaft hole 1b, a bent piece 1c, 1
d is formed. Reference numerals 2 and 7 denote insulating substrates on which a resistor 9, a current collector 11, etc., which will be described later, are formed by printing, and the insulating substrates 2 and 7 have shaft holes 2b,
7b and recesses 2c, 7c are formed, and terminals 3, 8 are attached to the respective ends by eyelets 3a, 8a. Note that the terminals 3 and 8 are arranged at symmetrical positions with respect to the shaft holes 2b and 7b through which shaft portions 4a and 4d of the slider receiver 4, which will be described later, are inserted, and the terminal 3 is located in the first From the surface on which the resistor and current collector (none of which are shown) of the second insulating substrate 2 are formed, the terminal 8 can be seen from the surface where the resistor 9 and current collector 11 of the second insulating substrate 7 are formed. They are each led outward (downward in FIG. 2) from a surface different from the surface in which they are located. Reference numeral 4 denotes a slider receiver made of molded resin, and the slider receiver 4 includes shaft portions 4a, 4d and a receiving portion 4c.
A projection 4e for receiving the slider receiver 5, and a projection 4f serving as a stopper for regulating rotation are formed at each end of the receiving portion 4c. Note that a cutting portion 4b is formed at the end of the shaft portion 4a. 5 is a slider piece made of a metal plate, and the slider piece 5 has a plate portion 5a, a mounting hole 5b for engaging with the protrusion 4e, and outer and inner sliders 5c. , 5e are formed. In addition,
The slider 5e is connected to the plate portion 5a by a bent connection portion 5d. 6 is an annular case made of molded resin, and the case 6 includes a wall portion 6a.
, pillars 6b and 6d, and a convex portion 6c for a stopper.
is formed. The upper and lower surfaces of this convex portion 6c are inclined in the same direction with respect to the receiving portion 4c of the slider receiver 4, and the contact surfaces formed on both side surfaces of the convex portion 6c are are vertically shifted along the axial direction of the slider receiver 4, and these contact surfaces abut against both the projections 4f, respectively, and the slider receiver 4
Functions as a stopper to restrict the rotation range of the. Moreover, the support column 6b is formed longer than the support column 6d.

To explain the assembly and operation of the variable resistor configured as described above, first, the second insulating substrate 7, on which the resistor 9, current collector 11, terminal connection electrodes 10, 10, 12, etc. are formed, is Annular case 6
is placed. At this time, the elongated support column 6b of the case 6 is locked by the recess 7c of the insulating substrate 7, and positioning is performed. and slider piece 5
One shaft portion 4d of the slider receiver 4 to which is fixed is inserted into the shaft hole 7b, and the other shaft portion 4a is inserted into the shaft hole 2b of the first insulating substrate 2. At this time, the support 6b of the case 6 is inserted into the recess 2c of the insulating substrate 2 in the same manner as described above.
is locked. After that, the shaft hole 1b of the mounting plate 1 is inserted into the shaft part 4a, and the bent piece 1c extending to the side of the case 6 is bent below the second insulating board 7, and the first and second insulators are The substrates 2, 7, the case 6, and the slider receiver 4 are locked and integrated. In addition, bending piece 1
c is the pillar 6b of the case 6, as shown in FIG.
It is placed and positioned between 6b and 6b.

4a and 5b and 5a and 5b are diagrams for explaining the process of forming electrodes on an insulating substrate.
A current collector 11 and terminal connection electrodes 10, 10, 12 are formed using silver paste on an insulating substrate 7 by printing or the like. This silver paste is made of a material with good anti-sliding properties. Next, the resistor 9 is formed by printing the carbon resistor so that a portion of both ends of the carbon resistor overlaps the terminal connection electrodes 10, 10. Next, the eyelet 8 of the terminal 8 on the terminal connection electrodes 10, 10, 12
Electrodes 10', 10', and 12' are formed on the portions to be viewed by using a flexible silver paste such as a silver paste containing fine conductive rubber powder. Alternatively, the flexible silver paste may be a silver paste based on a thermosetting resin that is formed into a semi-cured state by applying a temperature lower than the curing temperature.

As described above, the electrode at the portion of the terminal 8 that fits into the eyelet 8a has a two-layer structure of a silver paste having sliding resistance (wear resistance) and a flexible silver paste. As a result, when the terminal 8 is attached to the second insulating substrate 7 as shown in FIG. 6, the eyelet 8a's eyelet 8a' is embedded into the flexible silver paste 12', increasing the bonding strength. You can get enough. In particular, it is effective in a part where a sufficient recess area cannot be taken, such as a micro-sized variable resistor with an outer diameter of 8 mm, as in the present case. Further, when the terminal 8 is soldered, the two-layer structure also has the effect of improving heat resistance.

FIG. 7 is a perspective view showing the slider piece 5, the slider piece 5 is made of a single elastic metal plate such as nickel silver,
A plate part 5a, a mounting hole 5b for engaging with the protrusion 4e of the slider receiver 4, an outer slider 5c formed at one end of the plate part 5a, and a folding A bent connecting portion 5d, an inner slider 5e extending from the bent connecting portion 5d, a shaft hole 5f into which the shaft portion 4a of the slider receiver 4 is inserted, and a bent portion with the plate portion 5a. The inner slider 5e is arranged on the connecting part 5g. Therefore, the connecting portion 5g to which the attachment hole 5b and the slider 5e are connected is located at a position opposite to the shaft hole 5f.

FIGS. 8a and 8b are a plan view and a front view of the slider receiver, and the slider receiver 4 is made of molded resin such as polyacetal, and has shaft parts 4a and 4d,
A pair of flat portions 4b formed at the ends of the shaft portion 4a.
and a receiving portion 4c on which the slider piece 5 is placed.
A projection 4e for attaching the slider piece 5, and a pair of stoppers for restricting the rotation of the slider receiver 4 by coming into contact with the contact surface of the protrusion 6c formed on the case 6. Protrusions 4f, 4f and an engaging portion 4g into which the shaft hole 5f of the slider piece 5 is inserted and locked are formed. Note that the protrusion 4e has a conical portion 4h at the tip.
and two protrusions 4i, 4 connected to the receiving portion 4c.
It consists of i.

FIG. 9 is a side view showing how the slider piece is attached to the slider receiver.

The respective shaft holes 5f of the pair of slider pieces 5 are inserted into the shaft portions 4a and 4d of the slider receiver 4, and the receiving portion 4c is inserted so that the mounting hole 5b is inserted into the protrusion 4e.
Place the slider piece 5 on top. As a result, each slider piece 5 is positioned relative to the slider receiver 4. Further, by thermally melting the conical portion 4h of the protrusion 4e, the slider piece 5 is firmly fixed to the slider receiver 4 without wobbling.
At this time, since the tip of the protrusion 4e is formed into a conical shape, smooth insertion into the attachment hole 5b having a small diameter is achieved, and workability is improved. moreover,
By forming the plurality of protrusions 4i, the attachment hole 5b is reliably engaged with and held by the protrusion 4e, and the slider piece 5 is accurately positioned on the slider receiver 4.

By this fixing, the slider 5c of the slider piece 5
protrudes from one end of the receiving portion 4c, and the slider 5e is arranged with the shaft portions 4a and 4d therebetween, so that the sliders 5c and 5e can be elastically deformed without any problem.

FIG. 10 is a diagram for explaining the stopper mechanism, in which a pair of stopper projections 4f formed on the slider receiver 4 abut against a pair of contact surfaces of a convex portion 6c formed on the case 6, respectively. This diagram schematically shows the state in which the As is clear from the figure, the receiving portion 4
When the protrusions 4f and 4f formed on the upper and lower opposing surfaces of each end of c come into contact with the convex portion 6c, the slider receiver 4 can be rotated left and right (movement in the direction of the arrow in the figure), respectively. However, as mentioned above, both upper and lower surfaces of the convex portion 6c are inclined with respect to the receiving portion 4c of the slider receiver 4, so that, for example, the upper protrusion 4f may touch one of the convex portions 6c. When contacting the contact surface, the slider 5c of the lower slider piece 5 touches the convex portion 6.
When the _lower protrusion 4f abuts the other contact surface of the protrusion 6c, the upper slider piece 5
The slider 5c has an escape space S ₂ above the convex portion 6c.
Go inside. Therefore, even if the distance between the contact surfaces of the convex portion 6c is set sufficiently long, in other words, even if the convex portion 6c is formed large enough to obtain sufficient stopper strength, the slider receiver 4 In addition to ensuring the rotation angle required for Suitable for use in linked variable resistors. In addition, the convex portion 6c having a large stopper strength is
can be formed on the inner wall surface of case 6.
Its mechanical strength is also increased, and from this point of view, it is suitable for a miniaturized double variable resistor.

As explained above, according to the present invention, relief spaces are formed by shifting the contact surfaces of the convex portions provided on the inner wall surface of the case in the direction of the rotation axis of the slider receiver, and these contact surfaces The rotation range of the slider receiver is restricted by bringing the stopper protrusion of the slider receiver into contact with the protrusion, so when the protrusion of the slider receiver comes into contact with the convex part, the slider piece A part of the stopper can be overlapped with the convex part by using the escape space, so even when using a small double variable resistor with many space constraints, it is possible to secure a sufficiently large stopper strength. The rotation angle required for the slider receiver can be secured, and its practical value is high.

[Brief explanation of the drawing]

The drawings all relate to embodiments of the present invention and are
The figure is a perspective view showing a small rotary variable resistor, Figure 2 is an exploded perspective view of the same, Figure 3 is a cross-sectional view of the same main part, Figures 4 a, b and 5 a, b are electrodes on an insulated substrate. FIG. 6 is a sectional view of the main part showing the state in which the terminal is mounted on the insulating substrate, FIG. 7 is a perspective view showing the slider piece, and FIGS. 8a and 8b are the slider pieces. FIG. 9 is a plan view and front view showing the slider receiver, FIG. 9 is a side view showing a state in which the slider piece is attached to the slider receiver, and FIG. 10 is a diagram for explaining the stopper mechanism. 1... Mounting plate, 2... First insulating board, 3, 8
...Terminal, 4...Slider receiver, 4f...Protrusion, 5
...Slider piece, 6...Case, 6a...Wall surface part,
6c...Convex portion, 7...Second insulating substrate.

Claims (1)

[Scope of utility model registration request] A case made of insulating synthetic resin, first and second insulating substrates disposed opposite to each other at both open ends of the case, and rotatably supported between the first and second insulating substrates. The slider receiver is provided with a slider receiver and slider pieces fixed to two different sides of the slider receiver, and the slider receiver is configured to be restricted from rotating within a predetermined angular range. In the dual variable resistor, the slider receiver is provided with a pair of stopper projections, and a projection is provided on the inner wall surface of the case that abuts the projections to restrict the rotation range of the slider receiver in forward and reverse directions. A pair of abutting surfaces of the protrusion are shifted in the direction of the rotation axis of the slider receiver to form an escape space in the vertical direction of the protrusion, and when the protrusion abuts the protrusion, . A dual variable resistor, characterized in that a portion of the slider piece is inserted into the escape space.