Optical keypad for explosive locations
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United States of America Patent
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Jan 24, 2017
Grant Date -
Jun 16, 2016
app pub date -
Dec 10, 2015
filing date -
Dec 10, 2014
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Abstract
An optical keypad for use in hazardous areas and which can ensure safe and reliable detection of keystrokes through an at least 8 mm thick glass window, as is required for electronics equipment located in hazardous explosive areas (In accordance with ATEX Directive 94/9/EC and similar requirements) is obtained by providing a system in which at least 6 LEDs are lit in a pseudo-random sequence, modulated by a pseudo-random frequency and the interval between the lighting of each of the LEDs is change randomly to avoid interference between collocated keypads and light from other sources, such as daylight and artificial light.
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