JPS6174302A - Small semi-fixed resistance knob device - 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 is directed to electronic device assembly using a printed circuit board, in which when using a small, down-sized semi-fixed resistor, the small semi-fixed resistor is not adjusted from its top surface. It is an object of the present invention to provide a knob device with extremely excellent rotational operability for adjustment from below a printed circuit board, and particularly to a device suitable for automatically adjusting this rotational operation by making full use of a servo device.

Conventional configuration and its problems When rotating a semi-fixed resistor in an electronic device using a conventional printed circuit board, fixed terminals 4, as shown in FIGS. 1 and 2,
After soldering 6 to the printed circuit board, a small screwdriver was inserted into the adjustment hole 2 from the top of the semi-fixed resistor 1. However, as the layout of electronic devices becomes more complex, There may be cases where adjustment must be made not only from the top surface of the semi-fixed resistor but also from the bottom surface using a screwdriver or the like.

In this case, a hole for inserting a screwdriver is prepared in advance on the printed circuit board, and the semi-fixed resistor 1 is adjusted by inserting the screwdriver from the bottom of the printed circuit board, but generally from the back side. When adjusting, the tip of the screwdriver could not be properly inserted into the center hole of the semi-fixed resistor.
This is particularly true when doing it manually, but when using an automatic adjustment device that makes full use of servo adjustment, not only will it be difficult for the screwdriver to enter the center hole of the semi-fixed resistor, but it will also be difficult to find the center hole properly. If an automatic screwdriver is inserted without it, the movable piece of the semi-fixed resistor may be damaged, which is a big problem especially in mass production.

Purpose of the Invention The present invention aims to solve the above-mentioned problems, and in particular, in assembling a printed circuit board using semi-fixed resistors in electronic equipment, it is possible to adjust the resistance value of the semi-fixed resistors from the top surface. In cases where the adjustment is done from the bottom instead of the normal adjustment hole, it is possible to prevent the pit of the adjustment screwdriver from fitting properly into the adjustment hole of the semi-fixed resistor, and even in automatic adjustment using a servo device. To create a semi-fixed resistor knob device in which a driver pin can be easily inserted into the semi-fixed resistor.

Structure of the Invention In order to achieve the above object, the present invention has the following structure.

In other words, it is usually constructed as a molded product of resin or the like, but
a rod-shaped part whose upper end matches the shape of the central hole to be inserted into the central hole of the movable terminal of the small semi-fixed resistor; It is equipped with a rotatable rotary operation part and a group of thin legs extending downward from key points around the dry nozzle hole of the rotary operation part, and the small semi-fixed part is mounted on a printed circuit board with pre-processed holes. To insert and solder the resistor, insert the upper end of the rod-shaped part into the center hole of the semi-fixed resistor, insert it between the printed circuit board and the semi-fixed resistor, and insert it through the hole made in the printed circuit board. The rotary operation section is configured to be rotated.

DESCRIPTION OF EMBODIMENTS FIGS. 3 to 5 show an embodiment of the present invention.
Figure 3 is an external view of the knob device of this embodiment inserted into a semi-fixed resistor and attached to a printed circuit board, Figure 4 is a perspective view of only the knob device of this embodiment, and Figure 6 is a perspective view of only the knob device of this embodiment. Diagram A
, B, and C are a cross-sectional view, an upper plan view, and a lower plan view. Note that sectional view B is a sectional view taken from a portion indicated by an arrow in lower plan view C.

Now, in this example, 3 is the main body of the semi-fixed resistor;
Reference numerals 4 and 5 are fixed terminals, and the other parts of the semi-fixed resistor are the same as the conventional ones, so a description thereof will be omitted.

Reference numeral 6 denotes a rod-shaped portion of the knob device, which is a rectangular parallelepiped square rod in the embodiment, but depending on the shape of the central hole 2 of the semi-fixed resistor 3, this can be shaped into a cross-shaped square rod or other shapes. It is also possible.

Reference numeral 7 is connected to the rod-shaped portion and appears to be cylindrical in appearance, but the inside thereof has a hexagonal wrench hole 8 and a flat head screwdriver hole 9 as shown in FIG. 6B, as well as FIG. 5C. The driver is inserted from the bottom. The hexagonal wrench hole 8 and flat head screwdriver hole 9 may be provided individually or both may coexist as in this embodiment. This is advantageous from a service repair perspective.

Reference numeral 10 denotes a thin leg group 1° extending downward from a key point around the driver hole of the rotary operation section 1o, and the leg group 1o can stand on its own. Above leg group 1
0 and the adjacent air conditioning unit 11, when the semi-fixed resistor 3 is actually soldered to the printed circuit board 12 by inserting the above-mentioned knob device, especially when performing automatic solder dipping,
The phenomenon of flux build-up due to flux application also occurs in the above-mentioned gripping device, but this flux vapor is released to other parts, and the driver holes 8 to 9 of the above-mentioned gripping device are
This is a means to minimize the adhesion of

Reference numeral 13 indicates a driver adjustment hole on the printed circuit board 12.

Based on the above configuration, the following effects are obtained in this embodiment.

First of all, the knob device of this embodiment is not a component that must be prepared in advance to be fixed to the semi-fixed resistor 3, but is manufactured as a completely independent component, and is not required during printed circuit board assembly. It can be supplied separately and assembled, and does not require any particular effort to assemble.

Second, by adding a semi-fixed resistor to this knob device, the screwdriver hole can be configured to be a hexagonal wrench hole, a slotted hole, or a cross hole, so it can be used as a servo device in mass production. As an automatic adjustment operation, it is extremely easy to insert and remove the driver pit, and it is much easier and more reliable than simply using the movable terminal hole 2 of the semi-fixed resistor 3, which significantly reduces process tact in mass production. It can be shortened considerably.

Thirdly, at the bottom of the grip device, attach the leg group 1o to the key points.
Since the air conditioning unit 11 and the air conditioner 11 are appropriately arranged, flux rising during solder dipping can be prevented even if a hexagonal wrench, glass, or flathead screwdriver hole is provided.

Fourthly, since the position of the driver hole of the rotary operation part is far above the printed circuit board surface by the leg group 10, thermal deformation of the rotary operation part during solder dipping can be minimized.

Effects of the Invention As described above, according to the present invention, it is possible to ensure the assembly of printed circuit boards of electronic devices and their semi-fixed adjustment work, and it is particularly effective when automatic adjustment is performed by making full use of a servo device. be.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a general small-sized semi-fixed resistor, Fig. 2 is a side view of the same, Fig. 3 is a side view of an embodiment of the present invention, Fig. 4 is an external perspective view of the embodiment, 5 people. B and C are a top plan view, a sectional view, and a top plan view of the same embodiment. 1...Movable piece of small semi-fixed resistor, 2...
Center hole of small semi-fixed resistor, 6... Rod-shaped part, 7.
... Rotation operation section, 8, 9 ... Driver hole, 1Q ... Leg group, 11 ... Air conditioning section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Diagram 3

Claims (1)

[Claims] A rod-shaped part whose upper end matches the shape of the central hole is inserted into the central hole of the movable terminal of the small semi-fixed resistor, and a screwdriver hole is provided at the lower end that connects with the rod-shaped part and can rotate together with the rod-shaped part. The rotary operation part is equipped with a rotary operation part and a group of thin legs extending downward from key points around the driver hole of the rotary operation part, and the upper end of the rod-like part is inserted into the center hole of the semi-fixed resistor to print. A knob device for a small semi-fixed resistor, which is interposed between a board and a semi-fixed resistor, and is configured such that the rotary operation part is rotated through a hole formed in the printed circuit board.