CAPACITIVE SENSING SYSTEM
First Claim
1. A capacitive sensing system comprising a sensor having thin film structure, the thin film structure comprising a sensor having a first insulating layer and a first conductive film comprising a sensing electrode formed on a first surface of the first insulating layer, a second conductive film comprising a back guard electrode, the back guard electrode formed in a single plane and comprising a peripheral portion in the same plane, the back guard electrode disposed on a second surface of the first insulating layer and a first surface of a second insulating layer or protective layer, wherein the peripheral portion of the back guard electrode extends beyond the sensing electrode to form a side guard electrode which substantially or completely surrounds the sensing electrode.
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Accused Products
Abstract
A capacitive sensing system, comprising a sensor having thin film structure, the thin film structure comprising a sensor having a first insulating layer and a first conductive film comprising a sensing electrode formed on a first surface of the first insulating layer and a second conductive film comprising a back guard electrode. The back guard electrode is formed in a single plane and comprises a peripheral portion in the same plane, and is disposed on a second surface of the first insulating layer and a first surface of a second insulating layer or protective layer. The peripheral portion of the back guard electrode extends beyond the sensing electrode to form a side guard electrode which substantially or completely surrounds the sensing electrode.
19 Citations
19 Claims
- 1. A capacitive sensing system comprising a sensor having thin film structure, the thin film structure comprising a sensor having a first insulating layer and a first conductive film comprising a sensing electrode formed on a first surface of the first insulating layer, a second conductive film comprising a back guard electrode, the back guard electrode formed in a single plane and comprising a peripheral portion in the same plane, the back guard electrode disposed on a second surface of the first insulating layer and a first surface of a second insulating layer or protective layer, wherein the peripheral portion of the back guard electrode extends beyond the sensing electrode to form a side guard electrode which substantially or completely surrounds the sensing electrode.
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8. A capacitive sensing system comprising a sensor having thin film structure, the thin film structure comprising a sensor having a first insulating layer, a first conductive film comprising a sensing electrode formed on a first surface of the first insulating layer, a second conductive film comprising a back guard electrode disposed on a second surface of the first insulating layer and a first surface of a second insulating layer, and a third conductive film comprising a shield electrode disposed on a second surface of the second insulating layer,
wherein the sensor is mounted to a structure and electrically connected to a triaxial cable, the shield electrode of the sensor being electrically connected to an outer conductor of the triaxial cable for making a connection to ground potential at an end of the cable remote from the sensors, and wherein the shield electrode of the sensor is not electrically connected to the structure at the sensor.
Specification