JPH0541529Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a linear displacement potentiometer that can detect the output by axial displacement of the sliding shaft. This invention relates to a holding structure for a substrate.

"Prior art" This type of conventional potentiometer was
No. 30770. This was constructed as shown in FIG. A sliding shaft 3 is passed through a through hole 4 formed at the lower end of the case 2, a sliding body 5 is coupled to the upper end of the sliding shaft 3 inside the case 2, and a sliding element 6 is fixed to the sliding body 5. At the same time, a spring seat 7 is provided. Guides 9 and 10 are integrally formed on the inner wall of the case 2, and an insulating substrate 8 is clamped and fixed between the guides 9 and 10. There is a closing member 1 in the upper part of the case 2.
1 is inserted into the case 2, and the closing member 11 fixedly supports the upper end of the base plate 8 and the spring 12.
The upper opening of the is closed. The lower end of the spring 12 is engaged with the spring seat 7. A recess 11a is formed in the closing member 11, and this recess 11
A terminal 13 which is curved and has a spring force is attached to the terminal a. This terminal 13 is in contact with the upper end 8A of the board 8, which is the connection part of the board 8, and the guide 1 is protruded from the inner wall of the recess 11a using the spring force of the terminal 13.
4 and is loaded into the recess 11a. Terminal 13 is electrically connected to the conductor portion of substrate 8 and lead wire 15 . A resistor and a current collector are formed on the substrate 8, and the slider 6 comes into sliding contact with these. Case 2
The recess formed by the closing member 11 is filled with a resin sealant 16 for sealing.

"Problem to be Solved by the Invention" In order to accurately detect the output of the potentiometer, it is required that the insulating substrate 8 be housed in the case 2 without wobbling.

Conventionally, the guides 9 and 10 are accommodated, but due to variations in the thickness of the insulating substrates or variations in the dimensions between the guides, wobbling occurs in the thickness direction of the insulating substrates. In addition, in the longitudinal direction of the insulating substrate, since it is sandwiched between the closing member 11 that closes the opening of the case and the bottom of the case 2, the insulating substrate This causes wobbling in the longitudinal direction.

This rattling not only reduces the output accuracy of the potentiometer but also causes sliding noise.

The purpose of this invention is to provide a holding structure for an insulating substrate that does not cause rattling.

"Means for solving the problem" A pair of grooves are formed in a case with an opening at one end, and a sliding shaft to which a sliding body with a sliding element attached is inserted into the shaft hole of the case. and is held freely.

Both sides of the insulating substrate on which the resistor and the current collector are formed are accommodated in the pair of grooves. The opening of this case is closed by a closing member.

This invention includes a first spring that biases the insulating substrate toward the panel and a second spring that biases the insulating substrate toward the bottom of the case.

"Embodiment" An embodiment of this invention will be described based on FIGS. 1 to 6.

The case 21 is made of synthetic resin, has an opening 22 on one end, a shaft hole 23 and a pin hole 24 (FIG. 4) on the other end, and a pair of protrusions 25 facing the inner wall of the case 21 to form a pair of strips. A groove 26 is formed. The fixed shaft 27 is fitted into the pin hole 24 of this case 21.

Motion body (made of synthetic resin) 3 with Motion element 31 attached
2 is fixed to a sliding shaft (made of metal) 33. The sliding body 32 is provided with a hole 32a through which the fixed shaft 27 is inserted. The sliding shaft 33 is inserted into the shaft hole 23 from the opening 22 side of the case 21, and the hole 32a of the sliding body 32 is passed through the fixed shaft 27.
3 is held movably in the case 21. The sliding shaft 33 is guided by the fixed shaft 27 and the shaft hole 23.

A pair of case 21 is formed on both sides of an insulating substrate 41 on which a resistor 42 and a current collector 43 are formed, and terminals 45 made of metal plates are connected to electrodes 44 of the resistor 42 and current collector 43 by soldering. is inserted into the groove 26 of. A first spring 51 made of a metal plate is interposed between the back surface of the insulating substrate 41 and the case 21 in the groove 26, and the insulating substrate 41 is biased toward the slider 31 side. The first spring 51 has a spring portion 52 cut and raised toward the insulating substrate 41 side.
The first spring 51 is provided with a locking piece 53 that locks into the notch 46 of the insulating substrate 41 .

The first spring 51 presses the back side of the insulating substrate 41 and presses the front side of the insulating substrate 41 against the pair of projections 25 of the case 21 . Therefore, the first spring 51
has the role of preventing wobbling of the insulating substrate 41 in the thickness direction. Also, the locking piece 53 of the first spring 51
is locked in the notch 46 of the insulating substrate 41, and the opening 22 of the case of the first spring 51 is caused by mechanical vibration.
Directional movement is restricted.

After the coil spring 54 is passed through the fixed shaft 27, the opening 22 of the case 21 is closed by a closing member 61. The purpose of the coil spring 54 is to return the sliding body 32 to its original position. A second spring 7 is attached to this closing member 61.
1 is installed. Second spring 7 made of a metal plate
1 has a curved portion 72 in the center, and both ends are folded back to form opposing projecting pieces 73. This opposing protrusion 7
The second spring 71 is attached to the closing member 61 by pinching the protrusion 62 of the closing member 61. The second spring 71 has the role of preventing the insulating substrate 41 from wobbling in the longitudinal direction by pressing the end surface 47 of the insulating substrate 41 and biasing the insulating substrate 41 toward the shaft hole 23 of the case 21 .

In this example, the second spring 71 is attached to the closing member 61, but this is not necessarily necessary, and the second spring 71 may simply be interposed between the closing member 61 and the end surface 47 of the insulating substrate 41. A lead wire 48 is soldered to the terminal 45 and led out of the case 21. This simply extends the terminal 45 and connects the case 21.
An adhesive 63 is applied and hardened to the opening 22 of the case 21, which may be led out and the lead wire 48 may be unnecessary, and the opening 22 is sealed.

As shown in FIG. 8, the first spring 51 and the second spring 71 may be constructed integrally.

``Effect of the invention'' According to this invention, the insulating substrate accommodated in a pair of grooves provided in the case is connected to the first
The spring prevents the insulating board from wobbling in the thickness direction, and the second spring interposed between the closing member and the insulating board prevents the insulating board from wobbling in the longitudinal direction, resulting in a potentiometer with high output accuracy. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of this invention, Fig. 2 is a sectional view taken along line AA in Fig. 1, Fig. 3 is a sectional view taken along BB in Fig. 1, and Fig. 4 is a sectional view taken along line BB in Fig. 1. Fig. 5 is a perspective view of the insulating substrate and the first spring, Fig. 6 is a perspective view of the closing member and the second spring, and Fig. 7 is a conventional linear displacement type. FIG. 8 is a side sectional view of the potentiometer and a perspective view showing an example in which the first spring and the second spring are integrated.

Claims (1)

[Claims for Utility Model Registration] A pair of grooves are formed in a case in which one end face is an opening and the bottom face is provided with a shaft hole, and a pair of grooves are formed facing each other from the opening towards the bottom face, and a resistor is formed on the surface. and both sides of an insulating substrate on which a current collector is formed are accommodated in the groove, and a sliding body having a sliding element attached thereto which is brought into sliding contact with the resistor and the current collector is fixed to a sliding shaft. , in a linear displacement potentiometer, the sliding shaft is inserted into the shaft hole of the case so as to be freely slidable, and the opening of the case is closed by a closing member; A first spring that biases the insulating substrate toward the lower side is disposed between the case and the back surface of the insulating substrate, and a second spring that biases the insulating substrate toward the bottom side of the case is disposed between the insulating substrate on the opening side. A linear displacement potentiometer, wherein the linear displacement potentiometer is disposed between an end face of the linear displacement potentiometer and the closing member.