JPH0334892Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a semi-fixed variable resistor, and particularly to an ultra-small semi-fixed variable resistor commonly called a chip type.

(Background of the idea) A hybrid device that mainly consists of ultra-small electronic components commonly known as chip components and a ceramic substrate.
Semi-fixed variable resistors 4 and 5 are also made ultra-small and built into ICs 1, 2, and 3 (first
figure). In such cases, a semi-fixed variable resistor, as described below, has conventionally been mounted flat, but this is because semi-fixed resistors are more stable when producing hybrid ICs, so they are fixed on the board. This is because it is easy. However, if it is mounted flat like the semi-fixed variable resistor 5 shown in FIG. 1, an adjustment driver cannot be inserted, so it has become necessary to mount it vertically.
Then, as shown in Figure 1, three or more hybrid
Opportunities for mounting ICs 1, 2, and 3 in a row are increasing as electronic devices become smaller and more multifunctional.

(Conventional technology) 2 to 5 show conventional semi-fixed variable resistors.

2 is a plan view, FIG. 3 is a sectional view taken along the line A--A in FIG. 2, FIG. 4 is a plan view of the insulating substrate, and FIG. 5 is a bottom view.

As shown in FIG. 4, the insulating substrate 10 has a substantially rectangular shape, has a cylindrical shaft support hole 11 in the center, and is made of an insulating material such as ceramic. A resistor 12 made of a mixed thin film of carbon and synthetic resin and a current collector 13 made of a thin silver film are formed on the surface of the insulating substrate 10. The resistor 12 has a horseshoe shape,
The current collector 13 has an annular shape, and both are formed on concentric circles with the shaft support hole 11 as the center. Resistor 1
Both ends of the terminal 2 are connected to a first terminal 16 and a third terminal 17 made of metal via thin silver films 14 and 15, respectively. The current collector 13 is connected to a metal current collector terminal 19 via a thin silver film 18 extending from one end thereof. These terminals 16, 17, 19 are the third
As shown in FIG.
is provided.

As shown in FIG. 3, a movable member 21 is rotatably mounted on the insulating substrate 10. As shown in FIG. The movable member 21 consists of a slider 22 formed by press working from an elastic metal plate, and an adjustment section 23 made of synthetic resin that is insert-molded integrally with the slider 22. The slider includes a sliding contact piece 24 that comes into sliding contact with the resistor 12, and a support section 25 that comes into sliding contact with the current collector 13 and supports the movable member 21 on the insulating substrate 10.
It is equipped with.

A retaining rod 26 having a cylindrical shaft body 27 is inserted into the insulating substrate 10 and the movable member 21, and the retaining rod 26
The movable member 21 is rotatably supported by the insulating substrate 10 by bending the distal end thereof outward. A second terminal 29 is formed on the flange portion 28 of the retaining rod 26 . The second terminal 29 and the current collector terminal 19 are electrically connected.

The semi-fixed variable resistor configured as above is
When the tip of the adjustment driver is inserted into the adjustment part 23 of the movable member 21 and rotated in the left-right direction in FIG. The resistance value between the first terminal 16 or the third terminal 17 and the second terminal 29 or the current collecting terminal 19 can be changed by sliding on the top.

(Problems with the prior art) When mounting such a semi-fixed variable resistor in a flat type, the printed wiring foil is attached at three locations: the first terminal 16, the second terminal 29, and the third terminal 17. By soldering, these three places are arranged in a triangular shape, so a stable and strong fixation can be obtained.
When mounting vertically on a hybrid IC, the first
Since the terminal 16, the second terminal 17, and the current collector terminal 19 are soldered to the printed wiring foil at three locations, these three locations are arranged in a straight line, and the weight of the movable member 21 makes them easy to fall over during installation. , It is easy to be pushed and fall down when inserting the adjustment screwdriver.

Therefore, such a semi-fixed variable resistor is often mounted flat on a hybrid IC as described above. Furthermore, since the insulating substrate 10 is small, approximately 4 mm square, the wiring spacing is narrow, and some devices are designed exclusively for flat mounting, excluding the current collector terminal 19.

(Purpose of the invention) As stated above, conventional ultra-compact semi-fixed variable resistors are only suitable for being mounted flat, despite the increasing need for vertical mounting. There was a problem.

The present invention was made with attention to this problem, and an object of the present invention is to provide an ultra-small semi-fixed variable resistor that can be easily installed vertically.

(Structure of the invention) The semi-fixed variable resistor according to the invention has a semi-fixed resistor main body excluding the current collecting terminal of a conventional semi-fixed variable resistor, and conducts to the second terminal of the semi-fixed resistor main body. A cover is added with an extension terminal provided at a predetermined position and a flat surface for suction.

(Embodiments of the invention) Hereinafter, embodiments of the invention will be described with reference to the drawings.

6 is a front view of the semi-fixed variable resistor according to the present invention, and FIG. 7 is a sectional side view taken along line BB in FIG. 6.

This semi-fixed variable resistor is composed of a semi-fixed variable resistor main body 30 and a cover 31 shown in FIG.

The semi-fixed variable resistor main body 30 is roughly similar to the semi-fixed variable resistor shown in the conventional example, but since the current collecting terminal 19 is unnecessary, the insulating substrate 32 is connected to the insulating substrate 10 shown in FIG. Electric body 13, silver thin film 18,
The current collector terminal 19 is omitted. This insulating substrate 32 is shown in FIG. 9, and 33 is a shaft support hole;
34 is a resistor, 35 and 36 are silver thin films, and 37 is a first
, and 38 is the third terminal. Note that the retaining rod 39 and the movable member 40 have exactly the same configuration as the retaining rod 26 and the movable member 21 of the conventional semi-fixed variable resistor, respectively.

On the other hand, the cover 31 is made by inserting synthetic resin into a lead 41 that is pressed from a stainless steel plate.
It is formed by molding, and a flat part 42 for suction is formed on the upper surface. The lead 41 has a connecting portion 44 that comes into contact with a flange portion 43 that is a second terminal of the fastening rod, and is bent stepwise from the connecting portion 44 and connected to an extension terminal 45. Extension terminal 45
is parallel to the shaft body 46 of the retaining rod 39, and is parallel to the insulating substrate 3
The first terminal 37 and the third terminal formed on the side surface of the
It is located on the surface including the terminal 38 of. The mutual positional relationship of the first and third terminals 37, 38 and the extension terminal 45 is approximately the same as the mutual positional relationship of the first to third terminals 16, 29, 17 of the conventional semi-fixed variable resistor. I take it as a thing.

The semi-fixed variable resistor according to the present invention is assembled by engaging the engaging protrusions 47, 48, 49 of the cover 31 with the insulating substrate 32 of the semi-fixed resistor main body, the flange portion 43, the connecting portion 44 Since both have spring properties, they come into contact with a predetermined pressure, so they are electrically connected reliably.

The semi-fixed variable resistor configured as above is
When the tip of the adjustment driver is inserted into the adjustment part of the movable member 44 and rotated in the left-right direction in FIG. The resistance value between the terminal 38 of No. 3 and the terminal can be changed.

(Effects of the invention) As described above, the invention includes a first terminal formed on the side surface of an insulating substrate;
An insulating cover that includes a semi-fixed resistor main body having a second terminal electrically connected to the slider, a connecting portion on the side surface, and an extension terminal exposed on the lower surface integral with the connecting portion.
The semi-fixed resistor main body is connected and fixed to the side surface of the cover, and the first terminal and the extension terminal are arranged on the same plane.
A semi-fixed resistor for flat mounting can be used for vertical mounting, and only one type of semi-fixed resistor needs to be prepared, resulting in good production efficiency.
Furthermore, when used for flat mounting, that is,
The positional relationship of the terminals of the semi-fixed resistor itself for flat mounting without a cover and the positional relationship of the terminals for vertical mounting with the cover attached are almost the same, so the semi-fixed resistor can be mounted. It is possible to use the printed circuit board pattern for both flat mounting and vertical mounting. Furthermore, since the cover is provided with a flat surface for suction, there is also an effect that automatic mounting is possible.

[Brief explanation of the drawing]

Figures 1 to 5 show conventional examples, Figure 1 is a perspective view showing the installation state of the semi-fixed variable resistor, Figure 2 is a plan view of the semi-fixed variable resistor, and Figure 3 is the figure 2. A
- A sectional view, Figure 4 is a plan view of the insulating substrate, Figure 5
The figure is a bottom view, FIGS. 6 to 9 show an embodiment of the present invention, FIG. 6 is a front view, FIG. 7 is a cross-sectional side view taken along line B-B in FIG. The side view, FIG. 9, is a plan view of the insulating substrate 32. 30...Semi-fixed variable resistor main body, 31...Cover, 32...Insulating substrate, 34...Resistor, 37,
38...Terminal, 42...Adsorption plane part, 43...Second terminal (flange part), 45...Extension terminal.

Claims (1)

[Claims for Utility Model Registration] (1) A first terminal connected to a resistor on the surface of an insulating substrate and formed on a side surface of the insulating substrate, and a second terminal electrically connected to the slider. It consists of a semi-fixed resistor main body, an insulating cover that has a flat part on the top surface, a conductive connection part exposed on the side surface, and an extension terminal integrated with the connection part and exposed on the bottom surface. , fixing the semi-fixed resistor main body to a side surface of the cover with the first terminal located substantially at the bottom of the cover and the second terminal connected and electrically connected to the connecting portion; A semi-fixed resistor, characterized in that the first terminal and the extension terminal are arranged on the same plane. (2) The positional relationship between the first terminal and the extension terminal described in claim 1 of the utility model registration claim is substantially the same as the positional relationship between the first terminal and the second terminal. A semi-fixed resistor featuring: