JPS63196005A - 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 polymer switches, potentiometers, trimmers, etc. have been made using carbon (C) or ruthenium oxide (RuO
A wiring board formed by firing a resistance paste such as □) 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 However, this sliding contact device tends to generate noise (and has a somewhat high contact resistance (and is unstable due to some variation). Moreover, it is easy to wear out and has a short lifespan.
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 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-t% Ag-Pd to prevent sulfurization.

However, contact materials with A g P d of 30 to 50 wt% are 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 and causes a lot of wear. It reaches the end of its lifespan early.

Furthermore, since the Ag-Pd 30-50-t% contact material has a low electrical conductivity (IAC 33.8-5.5), 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 made up of a thick film conductor pattern formed by firing a Cu-resin conductor paste connected to a resistor pattern, and an Ag board which can be slid against the thick film conductor pattern of this wiring board. - It is characterized in that it is constituted by a sliding contact in which a contact material containing 0.5 to 15 t% of cadmium oxide 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
The reason why g-cadmium oxide is set at 0.5 to 15 wt% is as follows.
If the cadmium oxide content in Ag is less than 0.5 wt%, the lubricating effect will be weak, and the sliding contact will be
This is because adhesion and peeling occur upon contact with a resin-based thick film conductor pattern, and if it exceeds 15-t%, it becomes a cause of noise generation.

(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 amount of Ag-cadmium oxide in the sliding contact is 0.5 to 15 wt.
% The hardness of the contact material (Hv90-120) is soft and slippery, so the contact resistance is low and stable, there is no damage to the Cu-resin thick film conductor pattern, and there is almost no adhesion or peeling. , good contact is obtained as wear is reduced. Furthermore, the Ag-cadmium oxide of the sliding contact is 0.5
The electrical conductivity of ~15wt% contact material is lAC370~80
%, so it does not generate heat.

(Example) To explain an example of the sliding contact device of the present invention, as shown in the figure, AffI of 98% purity with a plate thickness of 0.6 mm and a diameter of 30 M is shown in the figure.
A resistive paste of Rub is screen printed on the outer periphery of the Ch substrate 1 with a width of 3 m 1 II, and baked at 800°C to a thickness of 1
A thick film resistor pattern 2 of 0μ is formed, connected to this thick film resistor pattern 2, and screen printed with Ag-resin conductor paste in the circumferential direction, cured at 130°C, and spaced at 0.2 square intervals. A thick film conductor pattern (Cu-resin 26-t%) 3 having a width of 0.21 mm, a length of 7 mm, and a thickness of lOμ is formed to form a wiring board 4.
And so. On the other hand, two types of sliding contacts 5, which are slidably opposed to the thick film conductor pattern 3 of the wiring board 4, are composed of Ag-cadmium oxide 1wt% and Ag-cadmium oxide 3wt%-nickel oxide 0. Two types of rivets made from two types of 1wt% contact wire rods (diameters 1 and 5 mm), head diameter 3 mm, head thickness 0.6 mm, leg diameter 1.5 mS, leg length 1.5 mm. Each door 6 has a width of 4 cranes and a thickness of 0.15 m.
The contact mounting hole of the spring terminal material 7 made of Be-Cu is inserted into and tightened.

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 30 wt% Cu-P d contact material facing a thick film conductor pattern made of Ag-resin on a wiring board. The results shown in the table below were obtained.

Test conditions Contact crab 10g, operation: rotating reciprocating type (55 degrees), drive:
60 stroke/+*in, energizing: 12V, 100m
A: As is clear from the table above, the sliding contact device of Example 1.2 has a long life span, approximately twice as long as that of the conventional sliding device. This is just the Ag- of the sliding contact 5.
The hardness of the cadmium oxide 0.5 to 15 wt% contact material is soft (because it is slippery, it does not damage the opposing Cu-resin thick film conductor pattern 3, and it does not adhere or peel off). Wear is reduced and Ag-Cadmium oxide 0.
This is because the electrical conductivity of the contact material of 5 to 15-t% is good and no heat is generated.

Note that the above-mentioned lifespan is due to wear of the thick film conductor pattern 3.
The evaluation was made based on the case where the sliding contact 5 came into contact with the Alto3 substrate 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 part of cadmium oxide was added to 0.0
It may be replaced with an oxide of an iron group element in a range of 1 to 1 wt%.

(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 the Ag-cadmium oxide (0.5 to 15 wt%) is hard, and the sliding contact (Hv90 to 120) is soft and slippery. Since the Cu-resin thick film conductor pattern on the ceramic substrate is not worn out, adhesion and peeling are almost eliminated, and wear is reduced, good contact can be obtained.

Therefore, contact accuracy is improved and the life of the sliding contact device is significantly extended. Furthermore, the Ag-cadmium oxide of the sliding contact is 0.
．． Since the electrical conductivity of the 5-15eyt% 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. , and a sliding contact made of a contact material of 0.5 to 15% Ag-cadmium oxide 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 characterized by: