Sensing device for a capacitive sensor

Abstract

The invention relates to a capacitance-type sensor. The inductive device of the capacitance-type sensor comprises an upper cover, a printed circuit board matched with the upper cover, and three metal balls arranged in a cavity formed by the upper cover and the printed circuit board. A first inductive polar plate, a second inductive polar plate and a third inductive polar plate are printed on the upper surface of the printed circuit board through a copper foil. At least three metal pins are welded on the lower surface of the printed circuit board. The three metal pins are respectively connected to the first inductive polar plate, the second inductive polar plate and the third inductive polar plate on the printed circuit board. The three metal balls are made of nonmagnetic metals. The three metal balls respectively correspond to the first inductive polar plate, the second inductive polar plate and the third inductive polar plate in position. The metal balls on both sides are respectively and fixedly clamped in a fixed structure of the upper cover. The metal balls in the middle roll freely along with change of the inclination angle of the printed circuit board.

Description

technical field [0001] The invention relates to a capacitive sensor, in particular to a sensing device of the capacitive sensor. Background technique [0002] A capacitive sensor is a device that converts the measured change into a change in capacitance, which itself is a variable capacitor. Because this sensor has the characteristics of simple structure, small size, good dynamic response, high sensitivity, high resolution, and non-contact measurement, it is widely used in displacement, acceleration, vibration, pressure, pressure difference, liquid level, etc. Sub-content and other detection fields. [0003] The current capacitive sensor is usually composed of a casing, a sensing plate installed in the casing, a fixed structure and a detection chip. Among them, the induction plate is usually manufactured separately, which requires high precision of the production equipment, otherwise it is easy to cause the size of the induction plate to be different, which will affect the...

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Problems solved by technology

[0005] In the above-mentioned patent, when the metal ball 7 rolls from between the induction pole plates 4 on the printed circuit board 3, because the induction pole plate 4 is made of copper foil, and the copper foil has a certain thickness, the metal ball 7 never has copper In the process of rolling from the foil to the place without copper foil, and then rolling to the place with copper foil, it will cause certain obstacles to the rolling of the metal ball 7

In this way, for the occasions requiring high sensitivity of metal ball rolling, the above-mentioned capacitive sensors cannot meet the requirements very well.

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