JPH1019506A - Resistor substrate assembly structure of position sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resistor substrate assembly structure of position sensor of a low manufacturing cost and high reliability. SOLUTION: On the surface of a resistor substrate 5, an electrode 5a, a resistor film 5a and conductive paste 5c are formed. Then, to the electrode 5a at both ends, a voltage is applied from the outside. A slider 2 moves together with an actuator as a body, and a brush 3 attached to the slider 2 slides on the resistor film 5b and the conductive paste 5c. Based on the voltage taken out of the brush 3, a position of the actuator is detected. Then, due to a spring action of a connector terminal 6 integrated with a position sensor 1, the electrode 5a of the resistor substrate 5 is press-contacted to the connector terminal 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position sensor and, more particularly, to a resistance board mounting structure suitable for a position sensor for detecting a valve opening or the like.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a structure for assembling a resistor substrate of a position sensor conventionally used for detecting the opening of a throttle valve of an automobile engine. A resistance substrate 5 is fixed to the position sensor main body 1 shown in the figure, and a slider 2 is attached via a guide 4 so as to be slidable in the vertical direction. The brush 3 integrally fastened to the slider 2 comes into sliding contact with the resistive film and the conductive film on the surface of the resistive substrate 5.

The resistive film and the conductive film are connected to an electrode 5a shown in FIG. 2B via a conductive paste 5c. The electrode 5a is connected to a connector terminal 6 integrated with the position sensor main body 1 and an element terminal 7. The connector terminal 6 and the element terminal 7 are welded.

The element terminal 7 and the electrode 5a are shown in FIG.
The connection is made by the reflow solder 5d as shown in FIG. Generally, an electrode paste such as silver is used as the electrode 5a. However, the reflow solder 5d does not cover the entire surface of the electrode 5a. Covered by coating 5e.

[0005]

In the above-described conventional structure for mounting a resistor substrate of a position sensor, the number of components is large, and the connector terminal 6 and the element terminal 7 are not provided.
, Welding between the element terminals 7 and the electrodes 5a, cleaning after soldering, resin coating, baking after resin coating, and the like, there is a problem in that the number of working steps increases and the production cost increases. Also, element terminal 7
The reflow solder 5d and the element terminal 7 are interposed between the electrode 5a and the electrode 5a, so that there are many connection points and there is a problem in reliability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a structure for mounting a position sensor resistor substrate at a low cost and high reliability.

[0007]

According to the present invention, there is provided a position sensor mounting structure for a position sensor, wherein a voltage is externally applied to both ends of a resistive film formed on the surface of a resistive substrate, and the actuator is brought into sliding contact with the resistive film. In a position sensor that outputs a voltage taken out from an interlocking brush to the outside, a connector terminal is extended to a position where a resistor substrate is mounted, and an electrode of the resistor substrate is pressed against the connector terminal by a spring action of the connector terminal to clamp the resistor substrate.

In the above structure, the conductive paste is printed so as to cover the electrodes of the resistance substrate.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a position sensor mounting structure of a position sensor according to an embodiment of the present invention. FIG. 1A is a cross-sectional view showing an example in which the present invention is applied to a position sensor used to detect the opening of a throttle valve of an automobile engine. A resistance board 5 is fixed to the position sensor main body 1 shown in FIG. The brush 3 integrally fastened to the slider 2 comes into sliding contact with the resistive film and the conductive film on the surface of the resistive substrate 5. Slider 2
The shape of the brush 3 is shown in FIG. The slider 2 moves integrally with an actuator (not shown). The actuator opens and closes the valve.

As shown in FIG. 1D, a resistance film 5b, an electrode 5a, and a conductive paste 5c are formed on the surface of the resistance substrate 5 by printing. The electrode 5a is covered with a conductive paste 5c as shown in FIG. Since the electrode 5a is covered with the conductive paste 5c, migration is prevented. Since the electrode 5a is not soldered, the entire surface can be covered with the conductive paste 5c in this way.

The resistance substrate 5 is inserted into a slit of a rib 1a provided on the position sensor main body 1 as shown in FIG. 1 (c), and is clamped by a connector terminal 6 as shown in FIG. 1 (b). That is, connector terminal 6
Is integrated with the position sensor main body 1, but the distance between the tip of the connector terminal 6 and the position sensor main body 1 is smaller than the thickness of the resistance substrate 5, and the connector terminal 6 is pressed against the resistance substrate 5 by elasticity.

The three electrodes 5a are connected to the three connector terminals 6 via the coating of the conductive paste 5c, and are connected to the control device via the connectors. The control device applies a voltage to the electrodes 5a at both ends, and detects the valve opening based on a change in the voltage of the intermediate electrode 5a. The connector terminal 6a connected to the actuator is also formed integrally with the position sensor body 1.

[0013]

As described above, according to the structure for assembling the resistance board of the position sensor of the present invention, element terminals and reflow soldering are unnecessary, and the number of components is reduced. In addition, there are no work steps such as welding of the connector terminal and the element terminal, soldering of the element terminal and the electrode, cleaning after soldering, resin coating, and baking after resin coating, thereby simplifying the manufacturing process. In this way, the manufacturing cost is reduced, and the number of parts connecting the connector terminal and the electrode of the resistance substrate is reduced, so that the reliability is improved.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a structure for assembling a resistance board of a position sensor according to an embodiment of the present invention, FIG. 1B is an enlarged view of a portion A in FIG. 1A, and FIG. FIG. 1C is a perspective view showing a part of the resistance substrate assembly structure, FIG. 1D is a front view showing members in the resistance substrate assembly structure, and FIG. FIG.

FIG. 2A is a cross-sectional view showing an example of a structure for assembling a resistor substrate of a conventional position sensor, and FIG. 2B is a sectional view of FIG.
It is the A section enlarged view in.

[Explanation of symbols]

Reference Signs List 1 position sensor main body, 1a rib 2 slider 3 brush 4 guide 5 resistance board, 5a electrode, 5b resistance film, 5c conductive paste, 5d reflow solder, 5e resin coating 6 connector terminal 7 element terminal

Claims (2)

[Claims] 1. A position sensor for applying a voltage from the outside to both ends of a resistive film formed on the surface of a resistive substrate and slidingly contacting the resistive film and outputting a voltage taken out from a brush interlocked with an actuator, the position sensor comprising: A resistor board mounting structure for a position sensor, wherein the terminal is extended to a position where the resistor board is mounted, and an electrode of the resistor board is pressed against the connector terminal by a spring action of the connector terminal to hold the resistor board. 2. The structure according to claim 1, wherein a conductive paste is printed so as to cover the electrodes of said resistance substrate.