JPH0736403U - Rotating electronic components - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotary electronic component that has a simple structure, is easy to manufacture, and can reduce costs. [Structure] A sliding type object 60 to which a slider 68 is attached, a cover 80 made of a metal plate, various patterns are formed on a synthetic resin film, and a metal terminal 45 is joined to an end of each pattern. Film substrate 40 provided with connecting portion 46
And a holder 10 made of synthetic resin, and a film substrate 40, a sliding mold 60, and a cover 80 are mounted on the holder 10, which is a rotary electronic component. The cover 80 is provided with a pressing protrusion 89 that protrudes downward. A terminal holding portion 17 on which the metal terminal connecting portion 46 is placed is provided in a protruding manner on the outer periphery of the holding base 10. When the cover 80 and the holding base 10 are fixed, the cover 8
The 0 pressing protrusion 89 presses the metal terminal connecting portion 46 of the film substrate 40. As a result, the metal terminal connecting portion 46 is sandwiched and fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to rotary electronic components such as rotary variable resistors and rotary switches.

[0002]

[Problems to be Solved by Prior Art and Invention]

 FIG. 5 is a schematic side sectional view showing an example of a conventional rotary variable resistor. As shown in the figure, this rotary variable resistor holds a sliding type object 201 made of synthetic resin rotatably between a metal cover 203 and a hard substrate 205. The mounted metal slider 207 is brought into sliding contact with the resistor pattern formed on the upper surface of the hard substrate 205 and a current collecting pattern (not shown), and the sliding object 201 is rotated. The resistance value between the resistor pattern and the current collecting pattern is changed.

Metal terminals 209 are attached to the ends of the resistor pattern and the current collecting pattern of the hard substrate 205 by eyelets. The metal terminal 209 is inserted into a hole provided in another printed wiring board (not shown) and soldered.

However, in this rotary variable resistor, since a hard substrate is used as the substrate, the material cost thereof is high, the cost cannot be reduced, and the thickness cannot be reduced.

In order to reduce the cost, as shown in FIG. 6, a film substrate 211 in which a resistor pattern or the like is formed on an inexpensive synthetic resin film such as PET (polyethylene terephthalate) may be used as a substrate. In this case, a reinforcing plate 213 made of resin is attached below it. Reference numeral 215 denotes a terminal fixing film for fixing the metal terminal 209 on the film substrate 211, which is adhered or heat-welded on the film substrate 211.

However, in this case, since the film substrate 211 and the reinforcing plate 213 are not integrated, the metal terminal 209 moves when a force is applied as shown by a dotted line in the figure. Therefore, when the metal terminal 209 is attached to another printed wiring board, a mounting failure is likely to occur.

In order to solve this problem, as shown in FIG. 7, when the reinforcing plate 213 is molded, a film substrate 211 is molded on the reinforcing plate 213, and the terminal fixing film 215 of the film substrate 211 is placed on the reinforcing plate 213. The terminal pressing portion 217 formed integrally with the reinforcing plate 213 may be used for pressing.

However, in order to mold the film substrate 211, a special mold is required, and the manufacturing process thereof is complicated. Therefore, there is a problem that the manufacturing cost is increased from this point.

The present invention has been made in view of the above points, and an object thereof is to provide a rotary electronic component that has a simple structure, is easy to manufacture, and can reduce the cost.

[0010]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a sliding type product made of a synthetic resin and having a metallic slider attached at a predetermined position thereof, and a cover made of a metal plate for covering the upper part of the sliding type product. And a film substrate on which various patterns are formed on the synthetic resin film and metal terminals are connected to the end portions of the various patterns, and a synthetic resin holding table, and the film substrate slides on the holding table. A rotary electronic component having a structure in which a mold and a cover are attached and the slide base is rotatably held by fixing a holding base and a cover. A projecting portion is provided, and a tongue-shaped terminal holding portion for mounting the metal terminal connecting portion of the above-mentioned film substrate is provided on the outer periphery of the holding base so that the metal terminal connecting portion of the film substrate is pressed against the cover. Clamp and fix between the protrusion and the terminal holder of the holder.

Further, according to the present invention, the pressing protrusion of the cover presses the metal terminal connecting portion of the film substrate and the terminal holding portion of the holding base to bend them to a predetermined position.

[0012]

[Action]

 The metal terminal connection portion of the film substrate is securely sandwiched and fixed by the pressing protrusion and the terminal holding portion of the holding table. Therefore, when the rotary electronic component is mounted on another printed wiring board, the metal terminal connecting portion does not fluctuate. Therefore, when the metal terminal is attached to another printed wiring board, the attachment failure does not occur.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is an exploded perspective view showing a rotary variable resistor according to an embodiment of the present invention. As shown in the figure, in this rotary variable resistor, a film substrate 40, a sliding type object 60, a click plate 70 and a cover 80 are mounted on a holding base 10 to fix the holding base 10 and the cover 80. By doing so, the sliding type object 60 is rotatably held. Each component will be described below mainly with reference to FIG.

The holding table 10 is formed by molding a synthetic resin, and a circular storage hole 13 is provided in the center of a substantially square holding table body 11, and a small hole 15 is provided in the center thereof. The tongue plate-shaped terminal holding portion 17 is formed so as to project outward from one side of the terminal 11.

Further, protrusions 19 and 19 are provided at two corners of the upper surface of the holding table body 11, respectively, and a locking claw 85 of a cover 80 described below is engaged with the lower surface of the holding table body 11. There are provided recesses 21 (two on each side, only two on the front side are shown in the figure).

Further, a long groove 23 is provided at the base of the terminal holding portion 17 so that the terminal holding portion 17 can be easily bent, and a metal of the film substrate 40 described below is provided at the tip of the terminal holding portion 17. Four guide protrusions 25 for guiding the terminals 45 are provided.

Next, as the film substrate 40, a synthetic resin film made of, for example, inexpensive PET is formed into a substantially disc shape, a small hole 41 is provided in the center thereof, and various patterns such as a resistor pattern and a current collecting pattern are formed on the upper surface thereof. (Not shown) is provided.

Further, metal terminal connecting portions 46 formed by attaching five metal terminals 45 are provided on the ends of various patterns of the film substrate 40. The metal terminal connecting portion 46 is formed by joining the end portions of the metal terminals 45 to the respective end portions of the various patterns of the film substrate 40 via a conductive adhesive layer and fixing the terminals made of synthetic resin thereon. The film 47 is placed, and the resin film forming the film substrate 40 and the resin film forming the terminal fixing film 47 are locally heat-welded (fixed on both sides of the metal terminal 45) and fixed. Reference numeral 49 shown in the figure is a heat-welded portion. The conductive adhesive is not always necessary and may be omitted.

Next, the sliding mold 60 is formed by molding a synthetic resin, and has a cylindrical knob 63 from the center of a disk-shaped mold body 61 having a diameter that can be inserted into the storage hole 13 of the holding table 10. Is configured to project.

Further, in the vicinity of the outer periphery of the upper surface of the mold body 61, there are provided a recess 63 for engaging the engaging portion 72 of the click plate 70 described below and an engaging projection 65 for restricting the rotation of the sliding mold 60. Has been. A protrusion 67 (see FIG. 1) that engages with the small hole 41 of the film substrate 40 and the small hole 15 of the holding table 10 is provided at the center of the lower surface of the mold body 61, and the lower surface of the film substrate 61 has a projection 67. A metal slider 68 (see FIG. 1) that is in sliding contact with various patterns of 40 is attached.

Next, the click plate 70 is formed by cutting an elastic metal plate into a substantially square shape, and has a half ring shape around the knob insertion hole 74 in the center thereof and an arm portion tilted downward. 71 is provided. An engaging portion 72 projecting downward is provided at the center of the arm portion 71. Further, holes 73, 73 that engage with the protrusions 19, 19 provided on the holding base 10 are provided near the two corners of the click plate 70.

Next, the cover 80 is formed by transforming a metal plate into a substantially box shape having an open lower surface, and a hole 81 into which the knob 63 of the sliding mold 60 is inserted is provided in the center thereof. . On the side of the hole 81, a tongue-shaped locking piece 83 for contacting and locking the engaging projection 65 provided on the sliding mold 60 is provided so as to face downward. There is.

Two engaging claws 85, 85 and one fixing piece 87 project from the lower ends of the opposite sides of the cover 80 (however, only the front side is shown in FIG. 2). Exist). When the rotary variable resistor is attached to another printed wiring board by the fixing piece 87, the lower end 88 comes into contact with the printed wiring board so that its lower end contacts the printed wiring board at a height position. It is an adjustment piece.

A pressing protrusion 89 having a substantially L-shaped cross section and protruding downward is provided on one side of the cover 80. Further, holes 91 and 91 that engage with the protrusions 19 and 19 provided on the holding table 10 are provided near two corners of the cover 80.

Next, a method of assembling this rotary variable resistor will be described mainly with reference to FIG. That is, first, the film substrate 40 is inserted and placed in the storage hole 13 of the holding table 10. At this time, the metal terminal connecting portion 46 of the film substrate 40 is placed on the terminal holding portion 17 of the holding table 10, and the metal terminal 45 projects from between the guide projections 25 of the terminal holding portion 17.

Next, the sliding object 60 is inserted into the storage hole 13 of the holding table 10. At this time, the protrusion 67 (see FIG. 1) of the sliding mold 60 is inserted into the small hole 41 of the film substrate 40 and the small hole 15 of the holding table 10.

Then, the click plate 70 and the cover 80 are mounted on the holding table 10 from above the sliding type object 60. At this time, the knob 63 of the sliding type object 60 is attached to the knob insertion hole 74 of the clicking plate 70 and the cover. The projections 19 and 19 of the holding table 10 are inserted into the holes 73 and 73 of the click plate 70 and the holes 91 and 91 of the cover 80, respectively.

Then, the left and right two locking claws 85, 85 provided on the cover 80 are bent and engaged with the recesses 21 provided on the bottom surface of the holding table 10, so that the respective members are integrally fixed.

FIG. 1 is a side sectional view of the rotary variable resistor assembled as described above. As shown in the figure, in this rotary variable resistor, the film substrate 40, the sliding type object 60, the click plate 70, and the cover 80 are mounted on the holding base 10 to fix the holding base 10 and the cover 80. By doing so, the sliding type object 60 is rotatably held. When the sliding mold 60 is rotated, the slider 68 slides on the film substrate 40 to change the resistance value between the metal terminals 45. Note that the engagement protrusion 65 of the sliding object 60 abuts on the locking piece 83 of the cover 80, so that the movement thereof is restricted.

When the cover 80 and the holding base 10 are fixed, the pressing projection 89 of the cover 80 presses the terminal fixing film 47 on the upper surface of the metal terminal connecting portion 46 of the film substrate 40. At this time, the terminal holding portion 17 of the holding table 10 bends downward to a predetermined position. Since the terminal holding portion 17 is relatively thin and the long groove 23 is provided at the base thereof, the terminal holding portion 17 is appropriately easily bent.

As described above, the metal terminal connecting portion 46 of the film substrate 40 is securely held and fixed by being pressed into contact with the terminal holding portion 17 of the holding table 10 by the pressing protrusion 89. Therefore, when the rotary variable resistor is attached to another printed wiring board, the metal terminal connecting portion 46 does not fluctuate, and therefore, when the metal terminal 45 is attached to another printed wiring board, there is a mounting failure. It never happens.

The reason why the terminal holding portion 17 is pressed and bent by the pressing projection 89 is as follows. That is, if the pressing protrusion 89 is designed to abut the metal terminal connecting portion 46 placed on the terminal holding portion 17 in terms of dimensions, the pressing protrusion 89 may be a metal due to an assembly error or the like of each member. There is a possibility that the metal terminal connecting portion 46 cannot be clamped or fixed without coming into contact with the terminal connecting portion 46. Therefore, if the pressing protrusion 89 is designed to bend the terminal holding portion 17 to a predetermined position in advance, the above-mentioned assembly error can be sufficiently absorbed and the metal terminal connecting portion 46 can be reliably clamped and fixed. .

By the way, FIG. 3A is a side view of essential parts showing a portion of the metal terminal connecting portion 46 of the film substrate 40. As shown in the figure, the tip of the metal terminal 45 is oriented at 90 ° + α ° rather than 90 ° with respect to the surface of the film substrate 40. This angle α is set to be the same as the angle at which the terminal holding portion 17 is bent by the pressing protrusion 89.

Further, FIG. 3B is a side sectional view of an essential part showing the terminal holding part 17 of the holding table 10. As shown in the figure, the lower surface 17a of the terminal holding portion 17 is formed to be tapered by an angle α with respect to the horizontal.

As shown in FIG. 4, the pressing protrusion 89 bends the terminal holding portion 17 by an angle α, so that the tip of the metal terminal 45 is oriented truly downward, and the bottom surface of the terminal holding portion 17 is also downward. 17a becomes truly horizontal.

The invention of the present application is not limited to the above embodiment, and the following modifications are possible. (1) The structure of the metal terminal connecting portion is not limited to the structure of the above embodiment, and may be configured as follows, for example. Directly crimp and connect the metal terminals to the ends of various patterns. Connect the metal terminals to the ends of various patterns with a conductive adhesive (solder in some cases). In the case of the above configuration, since the cover is made of metal, it is necessary to intervene some kind of insulating material between the metal terminal connection portion and the pressing projection portion. For example, the following may be done. An insulating adhesive is applied on the metal terminal connection portion or the lower surface of the pressing protrusion. An insulating film is attached on the metal terminal connecting portion or the lower surface of the pressing protrusion. The pressing protrusion is not formed integrally with the cover but is formed of a separate member of synthetic resin material and attached to the cover. The point is that an insulating material may be interposed between the pressing protrusion and the metal terminal connecting portion.

(2) The above embodiment shows an example in which the present invention is applied to a rotary variable resistor, but the idea of the present invention is not limited to this, and is applicable to other rotary electronic parts such as rotary switches. Needless to say, it can be used.

[0038]

[Effect of device]

 As described in detail above, according to the rotary electronic component of the present invention, even though the thin and inexpensive film substrate is used as the substrate, the metal terminal connection portion of the film substrate is surely secured. It has an excellent effect that it is fixed, its production is easy, and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of a rotary variable resistor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a rotary variable resistor according to an embodiment of the present invention.

3 (a) is a side view of an essential part showing a portion of a metal terminal connecting portion 46 of the film substrate 40, and FIG. 3 (b) is an essential part showing a portion of a terminal holding portion 17 of the holding table 10. FIG. It is a sectional side view.

FIG. 4 is a side cross-sectional view of an essential part showing the relationship between the metal terminal connecting portion 46, the pressing protrusion 89 and the terminal holding portion 17.

FIG. 5 is a schematic side sectional view showing an example of a conventional rotary variable resistor.

FIG. 6 is a schematic side sectional view showing an example of another conventional rotary variable resistor.

FIG. 7 is a diagram showing a substrate used in still another conventional rotary variable resistor.

[Explanation of symbols]

 10 holding base 17 terminal holding portion 40 film substrate 45 metal terminal 46 metal terminal connecting portion 47 terminal fixing film 60 sliding type object 68 sliding element 80 cover 89 pressing protrusion

Claims (2)

[Scope of utility model registration request] 1. A sliding type article made of synthetic resin and having a metallic slider attached at a predetermined position thereof, a cover made of a metal plate for covering an upper portion of the sliding type article, and a synthetic resin film top. It is equipped with a film substrate on which various patterns are formed, and metal terminals are connected to the end portions of the various patterns, and a synthetic resin holding base, and the film substrate, the sliding type object and the cover are mounted on the holding base. In the rotary electronic component having a structure for rotatably holding the sliding object by fixing the holding base and the cover, a pressing protrusion protruding downward is provided at a predetermined position of the cover, A tongue-shaped terminal holding portion for mounting the metal terminal connecting portion of the film substrate is projected on the outer periphery of the holding base, and the metal terminal connecting portion of the film substrate is a pressing protrusion of the cover.
A rotary electronic component that is sandwiched and fixed between terminal holding portions of a holding base. 2. The rotary type according to claim 1, wherein the pressing protrusion of the cover presses the metal terminal connecting portion of the film substrate and the terminal holding portion of the holding base to bend the metal terminal connecting portion to a predetermined position. Electronic components.