JP2502979Y2 - Semi-fixed variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to, for example, a semi-fixed variable resistor capable of adjusting a resistance value at the time of assembling an electric circuit or after assembling, particularly a chip-type semi-fixed resistor. Regarding a variable resistor.

[Prior Art] FIGS. 6 to 8 are explanatory views of a conventional example, FIG. 6 is a plan view of a semi-fixed variable resistor, FIG. 7 is a sectional view taken along the line AA of FIG. FIG. 8 is an exploded perspective view of the slider piece.

In the drawing, reference numeral 1 denotes a resistance substrate having a through hole 2 in the substantially center thereof, and a resistor provided on the surface thereof, 4 is a terminal connected to an end portion of the resistor, and 5 is a hollow hole which is inserted into the through hole 2. Cylindrical part
An eyelet member composed of a flange portion 5b and a flange portion 5b locked to the lower surface of the resistance substrate 1. One end of the flange portion 5b is extended to form an intermediate terminal 6. Reference numeral 7 is a slider piece made of a metal plate.

The slider piece 7 is composed of a top plate 7a and a bottom plate 7b that are folded in two. The top plate 7a has a central circular hole 8 and engagement holes 9 and 9 formed on both sides of the periphery. The face plate 7b has a caulking hole 10 at the center thereof for caulking the upper end of the cylindrical portion 5a of the eyelet member 5, and a circular bowl portion 11 is formed around the caulking hole 10 by drawing, and the circular bowl portion 11 is Engagement holes 12 are formed on both sides of the periphery so as to face the engagement holes 9 of the upper surface plate 7a and penetrate the lower surface plate 7b. Then, the flange portion 5b is locked to the lower surface of the resistance substrate 1, penetrates the through hole 2 of the resistance substrate 1, and penetrates the lower surface plate 7b.
The upper end of the cylindrical portion 5a of the eyelet member 5 inserted into the caulking hole 10 is caulked to the peripheral edge of the caulking hole 10 and the slider piece 7
Is rotatably held on the resistance substrate 1 via a ring-shaped spacer 13.

The semi-fixed variable resistor having the above structure is soldered to a predetermined position on a circuit board (not shown) by reflow soldering, and then a driver or the like is inserted in the engaging hole 9 of the upper plate 7a and the engaging hole 12 of the lower plate 7b. When the tip of the adjusting tool of is engaged and the slider piece 7 is rotated, the contact position of the sliding contact 14 integrally provided on the lower surface plate 7b on the resistor is changed, and the desired resistance is obtained. Can be set to a value.

[Problems to be solved by the invention] By the way, in order to attach the above-mentioned semi-fixed variable resistor to the circuit board, a vacuum nozzle is applied to the top plate 7a of the slider piece 7 and the semi-fixed variable resistor is picked up. It is installed at a predetermined position on the circuit board and the terminals 4, 4 are fixed to the pattern on the circuit board by soldering. The circular hole 8 and the engagement hole 9 formed in the upper surface plate 7a are formed in the lower surface plate 7b. Since it is communicated with the engaged hole 12 and the hollow hole 15 of the eyelet member 5 and air flows in from below the lower surface plate 7b and the resistance substrate 1 through the engaged hole 12 and the hollow hole 15, There is a lot of air leakage even if it is adsorbed by the vacuum nozzle, and as a result, it is necessary to have an auto-recovery mechanism that detects adsorption failure and picks it up again, which significantly reduces work efficiency and makes it difficult to obtain the desired adsorption force. There were some inconveniences such as getting tired.

The present invention is intended to solve the above-described conventional problems, and an object of the present invention is to maintain the engaging force with the adjusting tool and prevent the suction nozzle and the mounting error from being caused by the vacuum nozzle. It is intended to provide a fixed variable resistor.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a resistance substrate having a through hole, a flange portion that is locked to the lower surface of the resistance substrate, and a hollow that is inserted into the through hole. An eyelet member having a cylindrical portion, a slider piece in which an upper surface plate having an engaging hole and a lower surface plate having a circular bowl portion are folded in two, and the cylindrical portion of the eyelet member is caulked with the circular bowl portion. By inserting into the hole and caulking, the slider piece is held in a rotatable state on the resistance substrate, and an adjusting tool is engaged with the engaging hole to move the slider piece. In a semi-fixed variable resistor whose resistance value can be finely adjusted by rotating, a recess extending outward from the circumference of the bowl is formed on the surface of the lower plate by drawing, and the recess is formed. Face the engaging hole of the upper surface plate, and in the flange portion of the eyelet member. A bent piece for closing the hollow hole of the cylindrical portion is formed.

[Operation] The embodiment of the present invention has the structure as described above, and the engagement hole provided in the upper surface plate is closed by the recess provided in the lower surface plate facing the engagement hole, and Since the hollow part of the eyelet member is closed by the bent piece provided on the flange part on the lower surface of the resistance substrate, air leakage during adsorption is significantly reduced compared to the conventional product, and vacuum adsorption can be performed easily. .

Further, since the adjusting tool engages with both the engaging hole of the upper surface plate and the concave portion of the lower surface plate of the slider piece, it is possible to reliably rotate the slider piece by the adjusting tool.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 5 are explanatory views of an embodiment of the present invention, FIG. 1 is a plan view of a semi-fixed variable resistor, and FIG. 2 is BB of FIG.
3 is a sectional view taken along the line CC of FIG. 1, and FIG.
The figure is an exploded perspective view of the slider piece, and FIGS. 5 (a) and 5 (b) are perspective views of the main part of the flange portion of the eyelet member, FIG. 5 (a) is a development view, and FIG. 5 (b) is It is a perspective view showing the state where the hollow part of the eyelet member is closed by a part of flange part.

The same parts as those of the conventional example shown in FIGS. 6 to 8 are designated by the same reference numerals, and the duplicated description will be omitted.

The difference between the present invention and the conventional example is that the bottom plate 7b of the slider piece 7 is
In place of the conventional engaging holes 12 on both sides of the circular bowl portion 11, the recesses 16 for driver engagement are formed on the surface of the lower surface plate 7b by drawing, and the cylindrical portion 5a of the eyelet member 5. A bending piece 17 is provided around the hollow hole 15 of the flange 5b on the opposite side of the side where the intermediate terminal 6 is provided, and the bending piece 17 includes two legs 18,18 and both legs 18,18. Disc part 19 connected to the tip of
As shown in FIG. 5 (a), the bent piece 17 is formed at the flange portion 5b of the eyelet member 5 at the dotted line 20 portion where the legs 18 and 18 are joined as shown in FIG. 5 (b). 5b is folded and polymerized, and the protrusion 19a of the disk 19 is used to form the hollow hole 15 of the revetment 5a.
Is the point that is blocked.

The semi-fixed variable resistor having the above-mentioned configuration is provided with the slider piece 7
The tip of an adjusting tool such as a driver is engaged with the engaging hole 9 of the upper surface plate 7a and the concave portion 16 of the lower surface plate 7b to rotate the slider piece 7, so that the sliding contact 14 is placed on the resistance substrate 1. It is possible to set a desired resistance value between the terminal 4 and the intermediate terminal 6 by moving on the resistor 3.

According to the above-described embodiment of the present invention, the engagement hole 9 of the upper plate 7a of the slider piece 7 is closed by the recess 16 of the lower plate 7b, and the hollow hole 15 of the eyelet member 5 is formed in the flange 5b. Bending pieces provided 17
Since it is blocked by the protrusion 19a of the disk portion 19, there is almost no air leakage when the upper plate 7a of the slider piece 7 is adsorbed by the vacuum nozzle, and therefore, the suction error or the mount by the vacuum nozzle is not caused. You won't make a mistake. Further, when the slider piece 7 is rotated by the adjusting tool, the tip of the adjusting tool is in both the engaging holes 9, 9 of the upper plate 7a of the slider piece 7 and the recess 16 of the lower plate 7b. Since it engages, the slider piece 7
The rotational force is reliably transmitted to. Furthermore, by closing the hollow hole 15 of the eyelet member 5 with the bent piece 17,
It is possible to prevent the flux from entering during soldering.

[Advantages of the Invention] According to the present invention, the engaging hole of the adjusting tool provided on the upper plate of the slider piece is closed by the recess provided on the lower plate, and the hollow hole of the eyelet member is provided on the flange part. Further, since it is closed by the bent piece, there is almost no air leakage when the upper surface plate of the slider piece is adsorbed by the vacuum nozzle.

Therefore, it is possible to prevent suction errors and mounting mistakes caused by the vacuum nozzle. Also, since the tip of the adjustment tool can be engaged with both the engaging hole of the upper plate and the recess of the lower plate, the slider can be reliably rotated by the adjusting tool when the resistance value is finely adjusted. It can be operated. Further, by closing the hollow portion of the eyelet member, it is possible to prevent the flux from entering during soldering.

[Brief description of drawings]

1 to 5 are explanatory views of an embodiment of the present invention. FIG. 1 is a plan view of a semi-fixed variable resistor, FIG. 2 is a sectional view taken along line BB of FIG. 1, and FIG. 1 is a cross-sectional view taken along the line CC of FIG. 1, FIG. 4 is an exploded perspective view of the slider piece, and FIG. 5 is a perspective view of a main portion of the flange portion of the eyelet member. FIG. 6B is a perspective view showing a state in which the hollow portion of the eyelet member is closed by a part of the flange portion, and FIGS. 6 to 8 are explanatory views of a conventional example. 7 is a plan view of the semi-fixed variable resistor, FIG. 7 is a sectional view taken along the line AA of FIG. 6, and FIG. 8 is an exploded perspective view of the slider piece. 1 ... Resistive substrate, 2 ... Through hole, 5 ... Eyelet member, 5a ...
… Cylindrical part, 5b …… Flange part, 7 …… Slider piece, 7a ……
Top plate, 7b ... bottom plate, 9 ... engaging hole, 11 ... circular bowl,
14 …… Sliding contact, 16 …… Concave, 17 …… Bending piece, 18 ……
Leg, 19 ... Disc part.

Claims (1)

(57) [Scope of utility model registration request] 1. A resistance board having a through hole, an eyelet member having a flange portion locked to a lower surface of the resistance board and a hollow cylindrical portion inserted into the through hole, and an upper surface plate having an engagement hole. And a slider piece in which a bottom plate having a bowl portion is folded in two, and the slider piece is inserted by caulking the cylindrical portion of the eyelet member into the caulking hole of the bowl portion. Semi-fixed, which is rotatably held on the resistance substrate, and in which fine adjustment of the resistance value is possible by rotating the slider piece by engaging an adjusting tool with the engaging hole. In the feasible resistor, a recess extending outwardly from the circumference of the bowl is formed on the surface of the lower plate by drawing, and the recess is opposed to the engaging hole of the upper plate, and the eyelet member. Forming a bent piece that closes the hollow hole of the cylindrical part on the flange part of A characteristic semi-fixed variable resistor.