JPS63196009A - Slide contactor - 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 applies to volume switches, potentiometers, and trimmers used for detection, control, setting, oscillators, etc. in measuring instruments, various machines, etc. (a type of variable resistor)
This paper relates to improvements to sliding contact devices used in, etc.

(Prior art and its problems) Sliding contact devices conventionally used in the above-mentioned volume switches, potentiometers, trimmers, etc. are made of carbon (C) or ruthenium oxide (Rung oxide) on a ceramic substrate.
), etc., to form a thick film resistance pattern, and a spring terminal material that can slide against the thick film resistance pattern of this wiring board, and an Ag contact material. This sliding contact device is constructed with a sliding contact made by caulking or welding, but this sliding contact device tends to generate noise (and has a somewhat high contact resistance (and is unstable due to some variation). It was easy to wear and had a short lifespan (and the contact reliability was somewhat lacking).For this reason, the part that slides with the sliding contact of the carbon or ruthenium oxide thick film resistor pattern on the ceramic substrate was
Either replace it with a u-resin conductor paste and cure it, or add Cu to the sliding parts of the thick film resistor pattern.
- Contact reliability is improved by layering and curing resin-based conductor paste, and the Ag contact material of the sliding contact is replaced with 30 to 50-t% Ag-Pd to prevent sulfurization.

However, the contact material with A g -P d 30 to 50 wt% is too hard at Hv 160 to 200, whereas the thick film conductor pattern, which is a cured product of Cu-resin conductor paste, is soft, resulting in increased wear. It reaches the end of its lifespan early.

Furthermore, since the Ag-Pd 30-50vt% contact material has a low electrical conductivity (IAC33.8-5.5), there are problems such as heat generation.

(Object of the Invention) An object of the present invention is to provide a sliding contact device that can solve the above problems.

(Means for Solving the Problems) A sliding contact device of the present invention for solving the above-mentioned problems includes forming a thick film resistance pattern by hardening a resistance paste on a ceramic substrate, and forming a thick film resistance pattern on a ceramic substrate. A wiring board formed by connecting to a resistor pattern and forming a thick film conductor pattern by firing a Cu-resin conductor paste, and a wiring board configured to be able to slide against the thick film conductor pattern of this wiring board. -W4
It is characterized in that it is constituted by a sliding contact formed by attaching 0 to 75 wt% of contact material to a spring terminal material.

In the sliding contact device of the present invention, the contact material of the sliding contact is A
The reason for setting g-W to 40 to 75-t% is that W in Ag is 4
If it is less than 0-t%, the lubricating effect will be weak, and when the sliding contact contacts with the Cu-resin thick film sensitive pattern on the ceramic substrate, adhesion and peeling will occur, and if it exceeds 75-t%, This is because the amount of oxides produced increases, causing noise.

(Function) In the sliding contact device configured as described above, in the contact action between the sliding contact and the thick film conductor pattern on the ceramic substrate, the hardness of the Ag-W40 to 75 wt% contact material of the sliding contact is Hv 100 to 130. ) is soft and slippery, so the contact resistance is low and stable, the Cu-resin thick film conductor pattern is not damaged, and there is almost no adhesion or peeling, reducing wear, making it a good choice. Contact can be obtained. Furthermore, since the electrical conductivity of the AgW40-75wt% contact material of the sliding contact is as good as IACS40-60%, no heat is generated.

(Example) To explain an example of the sliding contact device of the present invention, a 98% pure A with a plate thickness of 0.6 mm and a diameter of 301 m as shown in the figure.
l t 03 A resistor paste of RuO□ with a width of 3u is screen printed on the outer periphery of the substrate 1, and baked at 800°C to form a thick film resistor pattern 2 with a thickness of 10μ, and connected to this thick film resistor pattern 2. Then, a Cu-resin conductor paste was screen printed in the circumferential direction and cured at 130°C to give a thickness of 0.2
A wiring board 4 was prepared by forming thick film conductor patterns (Cu-resin 26 wt %) 3 having a width of 0.2 m, a length of 71 m, and a thickness of 10 μm at mm intervals. On the other hand, the two types of sliding contacts 5 which are slidably opposed to the thick film conductor pattern 3 of this wiring board 4 are Ag-WSC-t% and Ag-W65wt%.
Head diameter 3+U, head thickness 0.6 mm, leg diameter 1.5 mm made from two types of contact wire (diameter 1.5 mm)
, two types of rivet contacts 6 with a leg length of 1.5u, each with a width of 4
It is inserted into a contact mounting hole of a spring terminal material 7 made of Be-Cu with a thickness of 0.15 mm and a thickness of 0.15 mm.

The sliding contact device of Example 1.2 configured in this way,
A sliding opening/closing test was conducted under the following test conditions on a conventional sliding contact device consisting of a sliding contact having a contact material of 30 to 50 AgPd facing a thick film conductor pattern made of Cu-resin on a wiring board. , we obtained the results shown in the table below.

Test conditions Contact crab 10g, operation 2 rotation reciprocating type (55 degrees), drive;
60 strokes/sin, energization: 12■, 100mA As is clear from the table above, the sliding contact device of Example 1.2 has almost twice the lifespan compared to the conventional sliding device. I understand. This is simply the A g -W4 of the sliding contact 5.
0 to 75-t% Because the hardness of the contact material is soft and slippery,
There is no wear on the opposing Cu-resin thick film conductor pattern 3, and there is no adhesion or peeling. This is because it has good properties and does not generate heat.

Note that the above-mentioned lifespan is due to wear of the thick film conductor pattern 3.
The sliding contact 5 comes into contact with the A I Z 03 board,
Judgments were made based on the open state (infinite contact resistance) and the case where a short circuit occurred due to clogging of the slint portion between the thick film conductor patterns 3.

Although the wiring board 4 of the sliding contact device in the above embodiment is circular, it may also be rectangular. In that case, the thick film resistor pattern is preferably formed on one side end of the rectangular wiring board, and the thick film conductor patterns are preferably connected to the thick film resistor pattern and formed in parallel at regular intervals in the longitudinal direction thereof. The sliding contact is slidable in the longitudinal direction of the thick film resistor pattern, facing the thick film conductor pattern. In addition, a thick film resistor pattern is formed on a ceramic substrate in a bellows shape and reciprocated back and forth, and a wiring board is formed on which thick film conductor patterns are arranged at regular intervals, and the wiring board faces the thick film conductor pattern. It is also possible to use a sliding contact device consisting of a sliding contact that is slidable.

(Effects of the Invention) As can be seen from the above explanation, in the sliding contact device of the present invention, A g W40 to 75 wt% of the sliding contact is hard and Hv10.
0 to 130) is soft (slippery), so the Cu-resin thick film conductor pattern on the ceramic substrate will not be worn out during contact action, and there will be almost no adhesion or peeling, reducing wear. Therefore, good contact can be obtained.

Therefore, the contact reliability is improved and the life of the sliding contact device is significantly extended. Furthermore, since the electrical conductivity of the Ag-W to 75wt% contact material of the sliding contact is good, no heat is generated during the contact action, and welding is less likely to occur. Therefore, the welding resistance of the sliding contact device is significantly improved.

[Brief explanation of the drawing]

The figure is a schematic perspective view showing an embodiment of the sliding contact device of the present invention.

Claims (1)

[Claims] A wiring board formed by firing a resistor paste to form a thick film resistor pattern on a ceramic substrate, and connecting the thick film resistor pattern to harden a Cu-resin conductor paste to form a thick film conductor pattern. , made to be able to slide against the thick film conductor pattern of this wiring board, Ag-W40~
A sliding contact device comprising a sliding contact in which 75 wt% of contact material is attached to a spring terminal material.