JPH0343681Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a semi-fixed resistor that allows fine adjustment of the resistance value or voltage, for example, during and after assembly of an electric circuit, and particularly relates to a variable mechanism for a semi-fixed resistor. .

Semi-fixed resistors are electronic components that adjust resistance or voltage in order to optimize the device's function, and are used in consumer devices such as radios, televisions, and stereos, as well as telecommunications equipment and electronic measurement equipment. It is widely used in devices, electronic computers, and other electronic application equipment.

A conventional semi-fixed resistor consists of a resistor printed on an insulating substrate, a slider that comes into sliding contact with the resistor, and a variable mechanism that adjusts the resistance value of the resistor, as shown in Figure 1. has been done.

Figure 1 is a longitudinal sectional view of the semi-fixed resistor, Figure 2 is a side view of the variable mechanism seen from the left side of Figure 1, Figure 3 is a side view of the variable mechanism seen from the right side of Figure 1, and Figure 4 is a side view of the variable mechanism seen from the right side of Figure 1.
The figure is a plan view of the insulating substrate of FIG. 1.

1 to 4, reference numeral 1 denotes an insulating substrate made of ceramics, etc. A circular through hole 2 is formed in the insulating substrate 1, and a resistor 3 is placed on the insulating substrate 1.
is formed by printing.

A current collector 4 is inserted into the circular through hole 2 of the insulating substrate 1, and the current collector 4 rotatably moves a slider 6 having a contact 5 that slides on the resistor 3.
I support this.

7 and 8 are terminals attached to both ends of the resistor 3, 9 is a terminal of the current collector 4, and these terminals 7, 8,
9 is also a leg for mounting a semi-fixed resistor.

10 generally shows the variable mechanism of the resistor 3, and a second
As shown in the figure, an adjustment groove 11 is bored, and the back side has a slider receiver 13 that protrudes into the notch 12 of the slider 6 shown in FIG. A hollow cylindrical shaft 14 is bent as shown in FIG. 3 and is rotatably supported on the insulating substrate 1 by a fitting 15.

The semi-fixed resistor configured in this way can be manufactured by, for example, inserting the tip of a screwdriver (not shown) into the adjustment groove 11 of the variable mechanism 10 and rotating the variable mechanism 10 to the left or right in FIG. Then, the slider receiver 13 of the variable mechanism 10 slides the slider 6 and the contact 5 on the resistor 3 with the current collector 4 as the center, and the resistance value between the terminal 7 or the terminal 8 and the terminal 9 is changed. It can be changed.

However, in the conventional semi-fixed resistor, as shown in FIGS. 1 and 2, the variable mechanism 10 of the resistor 3 is disposed only on the surface side of the resistor 3.
The adjustment direction is limited to one direction, and for this reason, when installing this semi-fixed resistor into electrical equipment, other electronic components and other members get in the way, making adjustment work cumbersome. The disadvantage was that readjustment was time consuming.

The present invention was devised in view of the actual state of the prior art, and its purpose is to enable resistance adjustment work from both the front side and the back side, and to improve assembly workability. Another objective is to provide an excellent semi-fixed resistor.

In order to achieve the above object, the present invention includes an insulating substrate having a resistor, a slider that slides on the resistor, and first and second operating bodies that rotate the slider. In the semi-fixed resistor, the resistance value can be adjusted from the front side and the back side of the resistor body through these operating bodies, respectively, wherein the first operating body has an adjustment groove and the adjustment groove. a hollow shaft communicating with the groove is provided, the hollow shaft is rotatably inserted into the insulating substrate, and the second operating body is provided with a flange portion having an adjustment groove and a rotating shaft protruding from the flange portion; By inserting this rotating shaft into the hollow shaft and snapping its tip, the first and second
This is characterized by connecting two operating bodies.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 5 is a longitudinal cross-sectional view of the semi-fixed resistor of the present invention.
6 is a side view of the variable mechanism seen from the left side of FIG. 5, and FIG. 7 is a side view of the variable mechanism seen from the right side of FIG. 5.

In addition, in FIGS. 5 to 7, symbols 1 to 1
Up to 4 are the same as the conventional one.

5 to 7, reference numeral 16 generally indicates the variable back surface mechanism of the resistor 3, and a rear surface adjusting groove 17 is provided on one side of the operating body 22 constituting the variable back surface mechanism 16, and a rear surface adjusting groove 17 is provided on the other surface. A rotating shaft 18 is provided protrudingly, and the tip end 19 of this rotating shaft 18 is shaved off into a flat plate shape. Reference numeral 23 denotes a cylindrical hollow shaft protruding from the operating body of the front side variable mechanism 10 described above, and this hollow shaft 23 and the adjustment groove 11 are connected to the hole 20.
communicated via. This hollow shaft 23 encloses the rotating shaft 18 and its tip is in contact with the flange of the operating body 22. On the other hand, the tip of the rotating shaft 18
9 is fitted in the hole 20, and the variable mechanism 10 on the front side and the variable mechanism 16 on the back side are connected by this recess 21.

In such a structure, the difference from the conventional one is that in the conventional semi-fixed resistor, the variable mechanism 10 is connected to the resistor 3, as best shown in FIG.
However, in the present invention, as shown in FIG. 5, in addition to the variable mechanism 10, a rear variable mechanism 16 is arranged on the back surface of the resistor 3, and This made it possible to adjust the resistance value from both sides of the back side.

That is, in FIG. 5, the adjustment of the resistor 3 by the variable mechanism 10 is the same as that of the conventional one shown in FIGS. The rotating shaft 18 of the variable back mechanism 16 is inserted into the hollow shaft 14 , and the flat tip 19 of the rotating shaft 18 of the variable back mechanism 16 is fitted into the hole 20 of the variable mechanism 10 . Since the variable mechanism 10 and the variable back mechanism 16 are integrally connected by the fitting portion 21, it is not possible to rotate the rear adjusting groove 17 of the variable back mechanism 16 to the left or right using, for example, a screwdriver. The variable mechanism 10 is rotated by the slider receiver 13, and the contact 6 of the slider 6 is rotated by the slider receiver 13 to adjust the resistance value of the resistor 3.

In this way, the semi-fixed resistor of the present invention has variable mechanisms on the front and back sides of the resistor, so
Even after the resistor 3 is installed, readjustment can be made from either the front side or the back side using a narrow gap.

In addition, the front side variable mechanism 10 and the back side variable mechanism 16
When connecting the two variable mechanisms 1, the hollow shaft 23
Since it functions as a spacer for forming the gap between 0 and 16, the insulating substrate 1
This prevents deformation of the slider 6 and the slider 6, and improves assembly work efficiency.

As explained above, according to the present invention, it is possible to adjust the resistance value from both the front side and the back side, and the hollow shaft can be used to improve assembly workability, making it possible to put it into practical use. The value is high.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional semi-fixed resistors; Figure 1 is a vertical cross-sectional view of the semi-fixed resistor;
Fig. 2 is a side view of the variable mechanism seen from the left side of Fig. 1, Fig. 3 is a side view of the variable mechanism seen from the right side of Fig. 1, Fig. 4 is a plan view of the resistor, and Figs.
The figure shows the semi-fixed resistor of the present invention.
6 is a side view of the variable mechanism as seen from the left side of FIG. 5, and FIG. 7 is a side view of the rear variable mechanism as seen from the right side of FIG. 5. 3...Resistor, 5...Contact, 6...Slider, 1
0...Variable mechanism, 16...Back variable mechanism.

Claims (1)

[Scope of utility model registration request] an insulating substrate having a resistor, a slider that slides on the resistor, and a first slider that rotates the slider.
and a second operation body, and the resistance value can be adjusted from the front side and the back side of the resistor body through these operation bodies, respectively. An adjustment groove and a hollow shaft communicating with the adjustment groove are provided in the body, the hollow shaft is rotatably inserted into the insulating substrate, and the second operating body has a flange portion having the adjustment groove and a flange portion protruding from the flange portion. the first and second operating bodies are connected by inserting the rotating shaft into the hollow shaft until the flange abuts the tip of the hollow shaft and then engaging the tip; A semi-fixed resistor characterized by: