In this type of keyboard, pressing a key changes the capacitance of a pattern of capacitor pads. The pattern consists of two D-shaped capacitor pads for each switch, printed on a printed circuit board (PCB) and covered by a thin, insulating film of soldermask which acts as a dielectric.
Despite the sophistication of the concept, the mechanism of capacitive switching is physically simple. The movable part ends with a flat foam element about the size of an aspirin tablet, finished with aluminum foil. Opposite the switch is a PCB with the capacitor pads. When the key is pressed, the foil tightly clings to the surface of the PCB, forming a daisy chain of two capacitors between contact pads and itself separated with thin soldermask, and thus "shorting" the contact pads with an easily detectable drop of capacitive reactance between them. Usually this permits a pulse or pulse train to be sensed. Because the switch doesn't have an actual electrical contact, there is no debouncing necessary. The keys do not need to be fully pressed to be actuated, which enables some people to type faster.
The IBM Model F keyboard is mechanical-key design consisted of a buckling spring over a capacitive PCB, similarly to the later Model M keyboard that used a membrane in place of the PCB.
The most known company for their capacitive (electrostatic) switching technology is Topre Corporation from Japan. Unfortunately though, their products are not available in large parts of the world.
According to this study, over the next five years the Capacitive Keyboards market will register a xx% CAGR in terms o ...
Table of Contents
2019-2024 Global Capacitive Keyboards Consumption Market Report
1 Scope of the Report
1.1 Market Introduction
1.2 Research Objectives
1.3 Years Considered
1.4 Market Research Methodology
1.5 Economic Indicators
1.6 Currency Considered
2 Executive Summary
2.1 World Market Overview
2.1.1 Global Capacitive Keyboards Consumption 2014-2024
2.1.2 Capacitive Keyboards Consumption CAGR by Region
2.2 Capacitive Keyboards Segment by Type
2.2.1 With RGB
2.3 Capacitive Keyboards Consumption by Type
2.3.1 Global Capacitive Keyboards Consumption Market Share by Type (2014-2019)
2.3.2 Global Capacitive Keyboards Revenue and Market Share by Type (2014-2019)
2.3.3 Global Capacitive Keyboards Sale Price by Type (2014-2019)
2.4 Capacitive Keyboards Segment by Application
2.5 Capacitive Keyboards Consumption by Application