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Embedded capacitive sensor in metal case

A technology of capacitive sensor, metal casing, applied in the field of integrated circuits

Active Publication Date: 2017-08-01
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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External coating can be provided to protect conductors

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  • Embedded capacitive sensor in metal case
  • Embedded capacitive sensor in metal case
  • Embedded capacitive sensor in metal case

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Embodiment Construction

[0015] Capacitive Sensing and Its Applications in Mobile Devices

[0016] Capacitive sensing is used in many different types of sensors, including those used to detect and measure proximity, position or displacement, humidity, fluid level, and acceleration. Capacitive sensing has become increasingly popular as a Human Interface Device (HID) technology (eg, to provide a touch screen to replace a computer mouse). HID technology can be based on capacitive coupling, which uses human body capacitance as input. Capacitive touch sensors are used in many devices such as laptop touchpads, digital audio players, computer monitors / touchscreens, mobile phones, mobile devices, tablets, etc. Design engineers continue to choose capacitive sensors for their versatility, reliability, and robust, -device interface, and reduce mechanical switching costs.

[0017] Capacitive sensors typically detect anything that conducts electricity or has a different dielectric than air, such as a part of a...

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Abstract

Metal cases are increasingly in popularity in electronics such as smart phones, tablets, portable speakers, etc., since the look and feel of a metal case are appealing to the consumer. Unfortunately, the metal case is generally incompatible traditional capacitive sensing electrodes, which are usually provided on a printed circuit board or flex circuit and are only usable with plastic cases. To provide capacitive sensing with a metal case, a specialized material stack can be fabricated to embed capacitive sensors with the metal case. Specifically, a conductor (a conductive pad, or conductive layer) can be deposited over an oxide layer formed on the metal case (e.g., through anodization). An outer coating can be provided to protect the conductor. A further conductor and dielectric can be included in the material stack to form a double layer capacitive sensor.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to embedded capacitive sensors in metal shells of electronic equipment. Background technique [0002] Mobile devices are ubiquitous. The way you interact with them and the way mobile devices behave has evolved over time. An important technology of mobile devices is their sensing capabilities. Sensing can occur via many modalities such as tactile / pressure sensing, audio sensing, light / visual sensing, temperature sensing and capacitive sensing. Not only do these modalities allow us to interact with mobile devices in a variety of different ways, these modalities allow mobile devices to become "smarter" so that the mobile device can better understand the context and the way the user interacts with the mobile device. [0003] One interesting modality is capacitive sensing. Capacitive sensing has been used with touchscreens for some time to allow users to provide user input through ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/044G06F1/1656G06F3/0443G06F3/04883G06F2203/04103H03K2017/9602G06F1/1692
Inventor I·C·诺维特
Owner ANALOG DEVICES INC