JPH03180004A - Adjusting resistor for surface mounting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adjustment resistor used in electronic equipment, and particularly to a surface-mounted adjustment resistor mounted on the surface of a printed circuit board.

[Prior Art] A conventional surface mount adjustment resistor has the following characteristics as shown in FIG.
Use a tool such as a screwdriver to adjust the movable piece. Third
Figure (a) is a plan view showing the appearance of a surface mount adjustment resistor;
FIG. 3 1bl is a side view, and FIG. 3 1bl is a plan view showing the configuration of the resistor and the movable part. In the figure, 12 is an alumina substrate which is an insulator body, and 14 is the alumina substrate 12.
15a and 15b are external electrodes of the resistor 14, 16 is a movable part conductor located in the center of the resistor 14, and 17 is a -1- movable part. This is a common electrode as an external electrode of the conductor 16. Further, the alumina substrate 12 is connected to the U-shaped curved portion 14 of the resistor 14.
A movable piece 13 is rotatably installed in the center of a. - The movable piece 13 is provided with a groove 19 on one surface and has a contact piece 18 that electrically connects the resistor 14 and the movable part conductor 16. The contact piece 18 is
- One end is connected to the movable part conductor 16, the other end is the movable piece 13
At the same time, the resistor 14 slides on the U-shaped curved portion 14a of the resistor 14. This surface mount adjustment resistor is installed on the circuit board 2.
The external electrodes 15a, 15b and the common electrode 17 are soldered to the leads 21a to 2.1'c provided on the 0, and are used while being fixed by this soldering.

Next, the operation will be explained. The movable piece (3) is rotated by inserting a tool such as a screwdriver into the groove 19.

As the movable piece 13 rotates, the contact piece 18 moves to the resistor 14,
Slide h. From this contact piece 18 to the external electrodes 15a, 1
The length ■, 1°L2 of the resistor 14 up to 5b is the resistance value. That is, by rotating the iiJ moving piece 13, the resistance value can be set to an arbitrary value.

[Problems to be Solved by the Invention] Conventional adjustment resistors are configured as described above, and because they include a mechanically configured movable part, they cannot be made compact, resulting in a large mounting area, and the circuit The overall size of the board 20 cannot be reduced.

Furthermore, since the contact piece 18 is in mechanical contact with the resistor 14, contact failure of the contact piece 18 may occur due to foreign matter adhering to the resistor 14-L during cleaning, etc., or due to external vibrations. There were problems such as a predetermined resistance value being unable to be obtained.

This invention was made in order to solve the above-mentioned problems, and provides a surface mount adjustment resistor that eliminates moving parts and increases reliability, and that can reduce the mounting area by arranging the resistors three-dimensionally. The purpose is to

[Means for Solving the Problems] The surface mount adjustment resistor according to the present invention includes first resistors whose tips are opposite to each other and separated by a predetermined section. Between the second leads, each surface of the cylinder 1. A polygonal columnar insulator positioned so as to straddle the second lead;
a common electrode having both ends located at the tips of the leads; and a first electrode formed on a surface opposite to the surface on which the common electrode is formed. The first leads correspond to the tips of the second leads, respectively. It consists of a second electrode and resistors provided on both sides perpendicular to the common electrode and connecting the common electrode and the first electrode and the common electrode and the second electrode.

[Function] The surface mount adjustment resistor according to the present invention has a first and a second
A first resistor provided between the leads on a polygonal columnar insulator,
The respective resistance values are obtained by connecting either the second resistor or the common electrode.

[Embodiment] Hereinafter, a surface mount adjustment resistor which is an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, 1 is a surface mount adjustment resistor.

An insulator body 2 made of a prismatic body having regular polygonal end faces, such as ceramic shaped into a cube, and resistors 3a to 3d formed on side surfaces 2a to 2d of this insulator body 2.
and a common electrode 4 formed on one surface 2e of the insulator main body 2 and to which one end side of each of the resistors 3a to 3d is connected,
Each resistor 3 is formed on the opposite surface 2f of the common electrode 4.
It is composed of first to fourth electrodes 58 to 5d connected to the other end sides of each of electrodes a to 3d. Each of the above resistors 3a to 3
(1 is composed of different resistance values, and is set according to the purpose of use.

The above-mentioned surface mount adjustment resistor 1 has a first . It is located between the second leads 7a and 7b and is fixed by soldering. Since this surface mounting adjustment resistor 1 is cubic, it can be installed in any state on the circuit board 6, and depending on the combination, as shown in FIG. You can get the desired resistance value.

Figure 2 (al is a combination using the common electrode 4 and external electrodes 58 to 5d of each resistor 38 to 3d, Figure 2 (bl is a combination using the common electrode 4 and external electrodes 58 to 5d of each resistor 38 to 3d), Figure 2 (bl is a combination of the resistors 3a and 3c and the resistor 3b with 2f on the lower side without the resistor 3) .

3d in series, the tel in Figure 2 is the common electrode 4
The case where it is used as a resistance value of OΩ with the value on the lower side is shown.

As described above, since the surface mount adjustment resistor 1 has no mechanically configured moving parts, reliability is improved and the mounting area is small, allowing the circuit board 6 to be miniaturized.

In this embodiment, the insulator main body 2 is formed into a cube, but the present invention is not limited to this, and may be formed into a rectangular parallelepiped, a pentagonal prism, a hexagonal prism, etc.).

[Effects of the Invention 1] As described above, according to the present invention, a surface-mounted adjustment resistor has a common electrode provided on one surface of a polygonal columnar insulator, and a first resistor provided on the opposite surface of the common electrode. a second electrode; a common electrode on a side surface perpendicular to the surface on which the common electrode is provided; a resistor provided between the second electrodes; Since it is located between the second leads, the resistance value can be changed depending on the installation state of the insulator, and since there are no mechanically configured moving parts, reliability can be improved and the resistance value can be changed depending on the installation state of the insulator. Since they are arranged three-dimensionally, the mounting area is small, and (b) the circuit board can be made smaller.

[Brief explanation of drawings]

Figures 1 (fat, fb) are an external perspective view and a developed plan view of a surface mount adjustment resistor which is an embodiment of the present invention;
Figures (al to c) are circuit diagrams of the surface mount adjustment resistor of this embodiment, and Figures 3 (al to fc) are external plan views, side views, and internal plan views of the conventional surface mount adjustment resistor. 1... Surface mounting adjustment resistor, 2... Insulator body,
30~3d...Resistance, 4...Common electrode, 58~5d
...Electrode, 7a, 7b...Lead.

Claims (1)

[Claims] A polygonal columnar insulator positioned between first and second leads whose tips face each other with a predetermined distance l apart, each surface of which straddles the first and second leads, and a polygonal columnar insulator formed on one surface of the insulator. a common electrode having both ends located at the tips of the first and second leads; and a common electrode formed on a surface opposite to the surface on which the common electrode is formed and corresponding to the tips of the first and second leads, respectively. It consists of first and second electrodes, and resistors that are provided on both sides perpendicular to the surface on which the common electrode is formed and connect the common electrode and the first electrode, and the common electrode and the second electrode. Features of surface mount adjustment resistor.