JPH0532969Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a variable resistor whose resistance value can be adjusted.

(Prior art) Generally, variable resistors are installed in many electronic devices to adjust the resistance value, etc., but installing the variable resistors in mass-produced electronic devices requires a lot of man-hours. This was one of the causes of rising product costs. Therefore, due to recent advances in automatic assembly and robot technology, many automatic assemblies have been carried out in which variable resistors are automatically attached to substrates of electronic devices by machine hands of automatic feeding devices.

This automatic assembly involves, for example, holding variable resistors provided on a predetermined tape at regular intervals with a machine hand, cutting off the terminals fixed to the tape, and separating the tape and the variable resistor. A machine hand moves over a predetermined circuit board and attaches a variable resistor to a predetermined position on the circuit board.

(Problem to be solved by the invention) In the case of the above-mentioned conventional technology, when the side surface of the resistor board of the variable resistor is grasped with a machine hand, the solder used to fix the terminals flows and sticks to the side surface of the board. However, there was a problem in that the mounting position on the circuit board of the electronic device would be misaligned. That is, due to the solder on the side surface of the resistor substrate of the variable resistor, the machine hand grips an object that bulges to one side by the thickness of the solder, and the center of the object gripped by the machine hand shifts. and,
The machine hand attempts to mount the terminal on the circuit board of the electronic device with the terminal position shifted by this amount of deviation. especially,
In recent years, the density of circuit boards has increased due to the miniaturization of electronic devices and the density of components has increased, and variable resistors must be mounted with extremely high precision, and even the slightest deviation can cause defects. .

This invention was made in view of the above-mentioned problems, and aims to provide a variable resistor that does not become misaligned even during automatic assembly.

[Structure of the idea]

(Means for solving the problem) This idea is to fix the soldering point near the lead terminal mounting position of the resistor board of a variable resistor, avoiding the edge of the right side of the soldering point, to the side of the resistor board. This is a variable resistor equipped with a protruding metal piece.

(Function) The variable resistor of this invention has a protruding piece that protrudes to the side of the resistor board, so that even if the solder that fixes the terminal is attached to the surface of the lead terminal on the side of the resistor board, the protruding piece The distance between the resistor substrate and the other side surface is constant.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

A resistor such as a carbon-based film is printed on the surface of the resistor substrate 1, and both ends of the resistor 1 are connected to electrodes 2 and 3 provided on the periphery of the resistor substrate 1, respectively. . Further, the tip of a slidable slider (not shown) that is pivotally supported by a shaft 4 provided approximately at the center of the resistor substrate 1 is in contact with the resistor 1 . One end of this slider is fixed to the casing 5, and the casing 5 is provided so as to be rotatable about the shaft 4 with respect to the resistor board 1. Therefore, by the rotation of the casing 5, the casing 5 is The slider slides. On the upper surface of this casing 5, the casing 5
A driver slot 15 is formed for rotating the resistor with respect to the resistor substrate 1.

The base ends of lead terminals 6 and 7 are fixed to the electrodes 2 and 3 with solders 8 and 9. Furthermore, axis 4
Lead terminals 10 and 11 electrically connected to the slider are fixed to the slider. Lead terminal 6,
7 points toward the center from the side surface of the soldering part of the resistor board 1 along the back surface of the resistor board 1;
It extends diagonally downward in front of the base end of the resistor board 1, and extends perpendicularly to the back surface of the resistor board 1 below the center of the resistor board 1. Similarly, the lead terminal 10 extends downward from the back surface of the resistor substrate 1 on the plane formed by the lead terminals 6 and 7. Furthermore, the lead terminal 11 faces the lead terminal 10 with the shaft 4 in between, and extends vertically downward from the resistor substrate 1. This lead terminal 11
is formed wider than other lead terminals, and is used for reinforcement when attached to a circuit board.

In addition, the soldering parts of the lead terminals 6 and 7 are
Projecting pieces 12 and 13 are provided in a cantilevered structure so that a portion of the lead terminals 6 and 7 face each other on the side surface of the resistor substrate 1 in parallel with this side surface.
The protruding pieces 12 and 13 are formed so that the distance l from the other side surface of the resistor substrate 1 is adjusted to a constant value. Furthermore, these protruding pieces 12 and 13 are shown in FIG.
As shown in FIG. 2, they protrude from the side surface of the resistor substrate 1, avoiding the edges 2a, 3a just beside the positions where the solders 8, 9 are provided. Therefore, even if the solder 8, 9 flows down to the side surface of the resistor board 1 where the lead terminals 6, 7 are attached, and the solder 8a adheres to the surface of the terminal, there is no solder on the surface of the protruding pieces 12, 13. does not adhere.

The variable resistor of this embodiment is attached to a tape 14 at regular intervals as shown in FIG. This variable resistor is installed. Here, the machine hand holds the resistor substrate 1 between the protruding pieces 12 and 13 and the opposite side surface thereof. Therefore, the distance l between the protruding pieces 12 and 13 and the opposite side surface is
is constant for each variable resistor on the tape 14, and the solder 8, 9 does not flow onto the protruding pieces 12, 13, so the deviation of the center position of the grip by the machine hand for each variable resistor is does not occur.

Moreover, the separation of the variable resistor from the tape 14 is as follows:
After gripping the resistor board 1 with the machine hand as described above, connect the lead terminals 6, 7, 1 at predetermined positions.
This is done by cutting 0.

According to this embodiment, the solders 8 and 9 for fixing the resistor board 1 and the lead terminals 6 and 7 flow down to the side surface of the resistor board 1, and the solders 8 and 9 that fix the resistor board 1 and the lead terminals 6 and 7 fall down to the side surfaces of the resistor board 1 and the lead terminals 6 and 7 correspond to the sides of the resistor board 1. Even if it sticks to a part, the gripping position will not be distorted by the machine hand of the automatic feeding device. Therefore, even during automatic assembly of electronic equipment, defects due to incorrect installation of the variable resistor will not occur.

Furthermore, since the protruding pieces 12 and 13 are formed by bending a portion of the lead terminals 6 and 7, the protruding pieces can be provided easily and inexpensively.

Note that the projecting piece of the variable resistor of this invention is not limited to the side surface of the resistor substrate, but may be provided at any position below or above, and may be formed separately from the lead terminal.

[Effect of idea]

The variable resistor of this invention has a protruding piece formed near the lead terminal mounting position on the resistor board.
Even if the solder for fixing the lead terminals flows down the side of the resistor board and adheres to the surface of the lead terminals, the distance between the protruding piece gripped by the machine hand during automatic assembly and the opposite side does not change, and the gripping center remains the same. doesn't go crazy. Therefore, when automatically assembling a variable resistor, when the variable resistor is attached to the circuit board of an electronic device using a machine hand, there is no misalignment, and the attachment can be done accurately and reliably, resulting in a product with high quality. The assembly yield is also improved.

In addition, since the protruding piece of the variable resistor of the present application is made of metal and has appropriate elasticity, the elasticity absorbs the shock etc. when the lead terminal is cut, and the resistor for taping does not cause positional deviation in the machine hand. It is suitable as

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of this invention, Fig. 2 is a front view of this embodiment, Fig. 3 is a right side view of this embodiment, and Fig. 4 is a use of the variable resistor of this embodiment. It is a front view showing a state. 1... Resistor substrate, 2, 3... Electrode, 6, 7,
10, 11... Lead terminal, 12, 13... Projecting piece.

Claims (1)

[Scope of utility model registration request] In a variable resistor in which the base ends of the lead terminals are soldered to the resistor board, and the tips of each lead terminal are regularly taped before being attached to the circuit board, one side of the resistor board is used. The base end of the pair of lead terminals soldered to the edge protrudes a certain amount to the side of the resistor board, avoiding the edge directly beside the soldering point, and the tip has a cantilevered structure. Protruding pieces facing each other in parallel with the side surfaces of the resistor board are provided, and the lead terminals are connected to the resistor at an intermediate position between the side surface of the resistor board opposite to the lead terminal soldering part and the outer surface of the protruding pieces. A variable resistor characterized by extending vertically from the back surface of a body substrate.