Ultrasound sensor and/or ultrasound converter for use in surrounding field recognition system in motor vehicle, has housing provided with piezo-ceramics for production of ultrasound vibrations in membrane pot and filled with granulates

摘要

The sensor and/or converter has a housing (1) provided with a piezo-ceramics (3) for production of ultrasound vibrations in a membrane pot (2). The housing is filled with granulates (5). A pressure element is provided between a water sealed cover (11) and the granulates, which comprises sand. The granulates consist of balls, which are made of silicon, ceramics or foam glass. The granulates exhibit a ball size, which ranges from 0.1 to 0.2 mm. A mechanical pre-stressing unit is provided in the housing and the membrane pot, after attaching of the cover. An independent claim is also included for a method for manufacturing the ultrasound sensor and/or ultrasound converter.