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Converter with at least one electrode of a first type, an electrode of a second type and at least one ferroelectret

一种铁电驻极体、转换器的技术，应用在驻极体静电换能器、压电/电致伸缩换能器、压电/电致伸缩换能器传声器等方向，能够解决转换器不最优灵敏度等问题，达到扩展方案改善、增强潜力、提高可靠性的效果

Active Publication Date: 2018-02-09
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In every transducer there are structurally unused regions or surfaces which do not contribute to the electret effect or piezoelectric effect, which lead to a suboptimal sensitivity of the transducer

Method used

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  • Converter with at least one electrode of a first type, an electrode of a second type and at least one ferroelectret
  • Converter with at least one electrode of a first type, an electrode of a second type and at least one ferroelectret
  • Converter with at least one electrode of a first type, an electrode of a second type and at least one ferroelectret

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Embodiment Construction

[0028] figure 1 A first embodiment according to the invention shows in a sectional view from the side a converter 1 , for example a sensor or an actuator, with electrodes 2 of the first type, electrodes 3 of the second type, electrets 4 , The arrangement of the ferroelectret 6 and the cover layer 7 defines that the electret is separated from the first type of electrode 2 by an air gap 5 . The covering layer 7 is placed over the entire surface on the electrodes 2 of the first type.

[0029] The voltage source 8 is connected to the electrodes 2 of the first type and on the other hand to the electrodes 3 of the second type. In plan view, the converter 1 can have a different geometry, for example radially symmetrical or elliptical about the main axis 9 , but also a square, cubic or cylindrical geometry. In this case, the ferroelectret 6 is arranged annularly or ovally around the electret 4 .

[0030] In plan view (not shown), the area of ​​the electret 4 has a ratio of between ...

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Abstract

The invention relates to a converter (1) having at least one electrode (2) of a first type, at least one electrode (3) of a second type and at least one ferroelectret (6). Furthermore, the converter (1) has at least one electret (4), wherein the electrodes (2) of the first type are conductively connected to the ferroelectret (6), the electret ( 4) separated from said first type of electrodes (2) by at least one air gap (5) and said electret (4) and said ferroelectret (6) from said second type of The electrodes (3) are electrically conductively connected. Ultrasonic sensors and microphones with such a transducer (1) are also subject of the present invention.

Description

technical field [0001] The invention relates to a converter having at least one electrode of a first type, an electrode of a second type and at least one ferroelectret. Background technique [0002] In the last decade, porous polymer films, so-called ferroelectrets, such as are available under the trade name Emfi from Emfit GmbH, have been intensively studied in scientific research and are used for various applications, also for acoustic applications. The ferroelectret is piezoelectric and has a piezoelectric constant that is comparable to that of lead zirconate titanate piezoelectric material (PZT). Viewed from the outside, ferroelectric materials (Ferroelektrika) ideally behave in the same way as conventional piezoelectric materials, however the external piezoelectric effect is produced by an infinite number of internal electret effects. Hence the name "ferroelectret", which can also be called piezoelectret. [0003] DE 10 2006 002 067 A1 shows a receiver of an ultrasoni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/09H01L41/113H01L41/193H04R17/00H04R17/02H04R19/01H10N30/20H10N30/30H10N30/857H10N30/88
CPCH04R19/016H10N30/206H10N30/30H10N30/857
Inventor D·巴尔特伊拉J·希伦布兰德
Owner ROBERT BOSCH GMBH
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