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Personal alarm device with vibrating accelerometer motion detector and planar piezoelectric hi-level sound generator
Personal alarm device with vibrating accelerometer motion detector and planar piezoelectric hi-level sound generator
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机译：带有振动加速度计运动检测器和平面压电高电平发声器的个人报警装置
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摘要
A personal alert safety system, having visual and audio safety components, in a small, lightweight, high impact casing with two compartments separated by a planar wall providing a watertight wall between the two compartments, the planar wall being a sealed laminated piezoelectric sound transducer. One of the compartments is sealed to provide a watertight chamber containing the electronic and electrical control and operating circuitry for the system. The second compartment is a resonating chamber with sound ports for the piezoelectric sound generating transducer. Two manual switch operators are located on opposite exterior sides of the casing and in a sealed manner actuate switches in the interior circuitry to turn the unit on and off, and simultaneous operation of both switches is required to turn the system "on" or "off". A vibrating accelerometer motion detector is included within and connected with the circuitry inside of the casing. There are several embodiments of each of the planar sound transducer and the vibrating accelerometer motion detector.
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