JPS63196001A - 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 (RuO□
), 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. The sliding contact device is constructed with a caulked or welded sliding contact, but this sliding contact device tends to generate noise, has a rather high contact resistance (and is unstable due to some variation, and is prone to wear). It was easy to contact, had a short lifespan, and was somewhat lacking in contact reliability.

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 is
Either replace it with a u-resin conductor paste and cure it, or add Cu to the part that slides with the sliding contact 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 wt% 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 30-50 wt% 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 firing 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 curing a Cu-resin conductor paste, and an Ag plate which can be slid against the thick film conductor pattern of the wiring board. The present invention is characterized in that it is composed of a contact material containing 5 to 15 at% of tin oxide and 2 to 10 wt.% of bismuth monoxide and a sliding contact that is attached to a spring terminal material.

In the sliding contact device of the present invention, the contact material of the sliding contact is A
g Tin monoxide 5-15wt% Bismuth monoxide 2-10w
The reason why it is set at t% is that if the tin oxide content in Ag is less than 5wt% or the bismuth oxide content is less than 2wt%, the lubricating effect will be weak, and the sliding contact will be difficult to contact with the Cu-resin thick film conductor pattern on the ceramic substrate. This is because adhesion and peeling occur, and if tin oxide exceeds 15 wt% or bismuth oxide exceeds 10 wt%, noise will be generated.

(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 sliding contact has Ag, tin monoxide, 5 to 15@t%, bismuth monoxide, 2 to Hardness of 10wt% contact material Hv120-15
5) Since it is soft and slippery, the contact resistance is low and stable, and the Cu-resin thick film conductor pattern is not damaged, and there is almost no adhesion or peeling, and wear is reduced, so it is good. You can get good contact. In addition, the sliding contacts include Ag, tin monoxide, 5 to 15 wt%, bismuth monoxide, 2 to 10 wt%.
Since the electrical conductivity of the contact material is good at 360-70% lAC, no heat is generated.

(Example) To explain an example of the sliding contact device of the present invention, as shown in the figure, a 98% pure Al having a plate thickness of 0.6n and a diameter of 30wa is used.
03 Screen print RuOx resistance paste in three widths on the outer periphery of the substrate 1, and bake it at 800℃ to a thickness of 10μ.
A thick film resistor pattern 2 of
** Thick film conductor patterns (Cu-resin 26 wt%) 3 having a width of 0.2 shoulders, a length of 7 fl, and a thickness of 10 μm were formed at intervals to form a wiring board 4. On the other hand, the two types of sliding contacts 5, which are made to slide oppositely to the thick film conductor pattern 3 of the wiring board 4, are composed of Ag, tin monoxide, 8 wt%, bismuth monoxide, 6 wt.
% and Ag tin monoxide 10wt% bismuth monoxide 5wt%
Two types of contact wires containing nickel monoxide 0.117% (diameter 1
．． Head diameter 3 cranes made from 5mm), head thickness 0.6f
i. Two types of rivet contacts 6 with a leg diameter of 1.5N and a leg length of 1.5m are each made of Be-Cu with a width of 4n and a thickness of 0.15mm.
It is inserted into the contact mounting hole of the spring terminal material 7 made of

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

Test conditions Contact crab 10g, operation: rotating reciprocating type (55 degrees), drive =
60 strokes/wins Energization: 12V, 100mA (
As is clear from the above table, the life of the sliding contact device of Example 1.2 is twice as long as that of the conventional sliding device. This is because the hardness of the Ag, tin monoxide, 5 to 15 wt%, bismuth monoxide, 2 to 10 wt%, contact material of the sliding contact 5 is soft (it is slippery, so the opposing Cu-resin thick film conductor pattern 3 may be damaged). There is no adhesive, and it sticks again.
This is because there is no peeling, wear is reduced, and the electrical conductivity of the contact material of Ag, tin monoxide, 5 to 15 wt%, and bismuth monoxide, 2 to 10 wt%, is good and does not generate heat.

Note that the above-mentioned lifespan is due to wear of the thick film conductor pattern 3.
The judgment was made based on the case where the sliding contact 5 came into contact with the Altos board and became an open state (infinite contact resistance), and the case where a short circuit occurred due to clogging of the slit 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.

Further, as in Example 2, a portion of tin oxide or bismuth oxide may be replaced with an oxide of an iron group element in a range of 0.01 to Int%.

(Effects of the Invention) As can be seen from the above explanation, the sliding contact device of the present invention has a sliding contact in which Ag=5 to 15 wt% of tin oxide and bis monoxide. S2
~10wt% is hard (Hv 120-155) but soft (slippery), so the Cu-4id fat-based thick film conductor pattern on the ceramic substrate will not be damaged by contact action, and there will be almost no adhesion or peeling. Good contact is obtained as there is no wear and tear.

Therefore, the contact reliability is improved and the life of the sliding contact device is significantly extended. Furthermore, Ag tin monoxide 5 to 15 of the sliding contact
Since the electrical conductivity of the 2 to 10 wt% bismuth monoxide contact material is good, no heat is generated during 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. , a sliding contact in which a contact material containing 5 to 15 wt% of Ag-tin oxide and 2 to 10 wt% of bismuth monoxide is attached to a spring terminal material so as to be able to slide against the thick film conductor pattern of the wiring board. A sliding contact device comprising: