JPH03214706A - Small-sized variable resistor - Google Patents

Abstract

PURPOSE:To make machine assembly possible for improving productivity by providing a hoop connection board between a resistor board provided with an outer terminal including an intermediate terminal and an axis. CONSTITUTION:After a hoop connection board 5 is inserted into an axis, a resistor board 2 is inserted into an axis part 1a in the state of a hoop and next, a slider 3 is also inserted into the shaft part 1a for being fixed and then cut after assembly in order to finish small-sized variable resistors as items. Further, the center hole 5a of the hoop connection board 5 is made in a toothed form for performing manufacture having stable reliability and high speed. Further, since the shaft can be inserted into the hoop connection board 5, the hoop can put the assembly in a consistent line. Thereby, high productivity can be attained and stable power output can be ensured, even when a flux is interposed between the shaft and the hoop connection board 5 at the time of mounting on the board.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to a reflow chip type small variable resistor used in video and audio equipment.

Conventional technology FIG. 3 is an exploded perspective view of a conventional small variable resistor.
According to the figure, 1 is a shaft, 2 has a central hole 2a,
An electrode part 2b is provided around the center hole, a first outer terminal part 2C is formed by extending the electrode part 2b, and a resistor part 2e has a second outer terminal part 2d at the end so as to surround the center hole. 3 is a resistor substrate provided with a slider. A small variable resistor is constructed by inserting the shaft 1 into the center hole 2a of the resistor substrate 2, further inserting the slider 3 from above the resistor substrate 2, and fixing it by caulking.

Fig. 4 is also an exploded perspective view of another conventional small variable resistor, and the same parts as the small variable resistor in Fig. 2 are given the same numbers, and the explanation will be omitted. These are terminals, and in addition to their role of taking out electrical output, they are connected in a hoop shape, and this middle terminal 4 also has the role of a connection plate when assembling small variable resistors in series.

Problems to be Solved by the Invention However, when assembling the conventional small variable resistor described above, in the case of the small variable resistor shown in FIG.
must be inserted into the resistor board 2 as a single item, which poses a problem in terms of mass productivity.In addition, in the case of the small variable resistor shown in Fig. 3, the middle terminal 4 is used as a hoop-shaped connection plate. Therefore, when it is mounted on a printed circuit board, there is a possibility that the flanks may get stuck between the shaft and the middle terminal, resulting in poor contact.

Means for Solving the Problems In order to solve the above problems, the present invention provides a hoop connection plate between a shaft and a resistor substrate provided with outer terminals including inner terminals.

As described above, the present invention provides a hoop connection plate between the resistor board and the shaft, so that the shaft can be inserted into the hoop connection plate, so that a consistent line using the hoop can be achieved during assembly. In addition to achieving higher productivity, the outer terminal part including the inner terminal is provided on the resistor board side, so even if flux is present between the shaft and the hoop connection board when it is attached to the printed circuit board, stable electricity can be achieved. It is possible to secure output and obtain more reliable product characteristics.

Example The present invention will be explained with reference to FIGS. 1 and 2.

FIG. 1 is an exploded perspective view of a small variable resistor that is an embodiment of the present invention, and FIG. 2 is a side cross-sectional view of the finished product, in which the same parts as in the prior art are given the same numbers. To explain without further explanation, 5 is a hoop connecting plate, and 5a is a chrysanthemum-shaped central hole, which prevents the shaft 1 from falling when inserted. After the shaft is inserted into the hoop connection plate 5, the resistor board 2 is inserted into the shaft portion 1a in a hoop state, and then the slider 3 is also connected to the shaft portion 1.
a, is fixed, and after the assembly is cut, a single small variable resistor is completed. Furthermore, by making the central hole 5a of the temporary houb connection 5 into a chrysanthemum-tooth shape, extremely stable and reliable high-speed manufacturing is possible.

Effects of the Invention As is clear from the above embodiments, the present invention enables mechanical assembly using hoop-shaped connection plates, thereby improving productivity. Moreover, since electrical continuity is not required, even if flux is present between the shaft and the hoop connection plate, no output abnormality occurs and stable characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a small variable resistor according to an embodiment of the present invention, FIG. 2 is a side sectional view of the finished product, and FIG. 3 is an exploded perspective view of a conventional small variable resistor. 4 shows another conventional small variable W. 1...Axis, 2...Resistor board, 2a.
...Central hole, 2b...Electrode part, 2C...
...First external terminal part, 2d... Second terminal part, 2e... Resistance part, 3... Slider,
5... Hoop-shaped connection plate.

Claims (2)

[Claims] (1) It has a shaft, a central hole into which the shaft is inserted, a hoop-shaped connecting plate that is cut after assembly, a central hole into which the shaft is inserted, and an electrode section around the central hole. and a resistor substrate having a first outer terminal portion which is an extension of the electrode portion, a resistor portion surrounding the central hole, and a second outer terminal portion provided at an end of the resistor portion;
Furthermore, a small variable resistor is comprised of a slider attached to the shaft. (2) The small variable resistor according to claim 1, which uses a hoop-shaped connection plate with a central hole shaped like a chrysanthemum.