JPH0752086B2 - Potentiometer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a potentiometer used for position angle control of various electronic devices.

Conventional Technology Conventional technology will be described with reference to the potentiometer shown in FIG. FIG. 3 is a side sectional view of a conventional potentiometer. According to FIG. 3, reference numeral 1 denotes a case formed of an insulating material, and a resistance element 2 having a resistor for obtaining a desired resistance value in the case 1, a sliding contact 5, a rotor 4
When the shaft 6 rotates, the rotor 4 connected to the shaft 6 by caulking or the like and further the sliding contact 5 connected to the rotor 4 rotate.

By slidingly contacting the sliding contact 5 with the resistance element 2, a desired resistance value or voltage obtained from the resistance element 2 can be obtained at the resistor terminal 3 connected to the resistance element 2. Further, since the resistor terminal 3 is connected to the connector terminal 10 of the connector portion 1a provided in the case 1, the resistance value and the voltage change due to the rotational movement of the shaft 6 are finally obtained from the connector terminal 10. It has become.

Furthermore, a cover 8 for fixing the resistance element 2
A sealant 9 for fixing the case 1 and the cover 8 and for waterproofing, and a seal rubber 7 for waterproofing between the shaft 6 and the case 1 are provided.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, since the adhesion strength between the case 1 and the sealant 9 is weak, a minute gap B is formed between them, and water or the like is sucked into the potentiometer by a breathing action, It had a problem that it adversely affected the potentiometer function. That is, when the ambient temperature of the potentiometer changes, the space inside the potentiometer
The air in 12a and 12b expands and contracts, creating a pressure difference with the air outside the potentiometer. Respiratory action occurs when this pressure difference tries to reach equilibrium. Normally, this breathing action is performed by the gap A between the shaft 6 and the mating portion of the case 1. Generally, a seal rubber 7 is provided to protect the waterproof property of the mating portion. Because of this, he cannot breathe completely. As a result, a minute gap B is generated between the sealant 9 and the case 1, and the breathing action is generated by the gap B, impairing the waterproof property.

The present invention is to solve such conventional problems,
It is intended to provide a potentiometer having a simple structure and greatly improved waterproofness by a breathing action.

Means for Solving the Problems The potentiometer of the present invention is provided with a through hole for communicating between the inside of the case and the connector portion directly attached to the case in order to achieve the above object.

Operation As described above, since the through hole that connects the inside of the case and the connector directly attached to the case is provided, when the mating connector is engaged, the respiratory action caused by the change in environmental temperature However, it is possible to improve the waterproof property by the through holes, the inside of the mating connector, the connected lead wire and the mating device.

Example Hereinafter, a potentiometer according to an example of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a side sectional view and FIG.
The figure is a diagram for explaining a connection state with a device. Note that the same numbers are assigned to the same parts as in the conventional technique.

According to FIG. 1, in a case 1 provided with a connector portion 1a, a resistance element 2 having a resistor for obtaining a desired resistance value on its surface, a sliding contact 5 slidingly contacting the resistance element 2, a sliding contact 5, a rotor terminal 4 for holding the rotor 5, a shaft 6 for holding the rotor 4, and a resistor terminal 3 connected to the resistor element 2 for inputting and outputting an electric signal.
And the connector terminal 10 housed in the connector portion 1a for connecting to the outer end device. At this time,
The space portions 12a and 12b formed in the case 1 and the outside of the case are communicated with each other through through holes 11a and 11b provided in the connector portion 1a. Further, the cover 8 fixes the resistance element 2 and is adhesively fixed by a sealant 9 between the cover 8 and the case 1.
Further, a seal rubber 7 for sealing is arranged at a mating portion between the shaft 6 and the case 1.

On the other hand, as shown in FIG. 2, the potentiometer generally includes a lead wire 16 and a lead wire 16 connected to a device control section for controlling the input / output of the potentiometer to the connector section 1a.
Mating connector 13 having terminal 14 coupled to terminal 1
0 and 14 are engaged so as to be pressed against each other. At this time, the waterproof property between the connector portion 1a and the mating connector 13 is the seal rubber 15
Further, the waterproof property between the lead wire 16 and the connector 13 is secured by the seal rubber 17. An insertion hole 18 for inserting and fixing the terminal 14 is provided in the connector 13.

Therefore, when the environmental temperature of the potentiometer changes, the breathing action of the space 12a, 12b in the case is caused by the through holes 11a, 1
1b through the terminal insertion hole 18
It will be held at 19. Further, the breathing action performed in the space portion 19 is transmitted through the inside of the lead wire (the gap between the core wires) and is performed by the device control portion. In general, this equipment control unit is composed of an electronic circuit and is attached at a position where it is not exposed to water, so that water does not enter from here.

Respiratory action of the case inner space 12a, 12b that occurs when the environmental temperature of the potentiometer changes is easily performed through the through holes 11a, 11b, and even if water etc. splashes on the potentiometer, it cannot enter the interior. In addition, the adverse effect on the potentiometer is avoided.

Therefore, it is possible to prevent the adverse effect of infiltration of water or the like from the outside due to the breathing action in the potentiometer with a simple structure in which the through holes 11a and 11b dedicated to breathing are formed.

Effects of the Invention As described above, the potentiometer of the present invention is provided with a through-hole for breathing between the space inside the case and the directly attached connector, and the through-hole facilitates the breathing action. As a result, even if water or the like is splashed on the potentiometer, it will not intrude into the interior, and the adverse effect of the water or the like on the potentiometer function can be prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view of a potentiometer according to an embodiment of the present invention, FIG. 2 is a diagram for explaining a connection state with equipment, and FIG. 3 is a side sectional view of a conventional potentiometer. 1 ... Case, 1a ... Connector, 2 ... Resistance element, 4 ... Rotor, 5 ... Sliding contact, 6 ... Shaft,
8 ... Covers, 12a, 12b ... Through holes.

Claims (1)

[Claims] 1. A resistance element having a resistor on its surface,
A sliding contact that slides in contact with the resistance element, a rotor that holds the sliding contact, a shaft that holds the rotor rotatably, and a space for accommodating these inside and a mating connector. A potentiometer comprising a case provided with a connector section for connecting to the connector, and a through hole communicating the space section inside the case with the connector section.