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Capacitive sensor for detecting a relative movement of two adjacent bodies

A capacitive sensor, relative motion technology, applied in the direction of converting sensor output, using electric/magnetic devices to transfer sensing components, instruments, etc.

Active Publication Date: 2015-07-15
BEHR HELLA THERMOCONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of very small deformation displacements, which should be detected with a capacitive sensor, then, however, a considerable amplification is required, wherein one then touches the limits of the electronic device, which concerns the noise performance of the electronic device

Method used

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  • Capacitive sensor for detecting a relative movement of two adjacent bodies
  • Capacitive sensor for detecting a relative movement of two adjacent bodies
  • Capacitive sensor for detecting a relative movement of two adjacent bodies

Examples

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Embodiment Construction

[0096] figure 1 is a perspective view of the housing 10 of the operating device 12 . The housing 10 has a front side 14 comprising buttons 16 , a rotary knob 18 , a display unit 20 and an operating bar 22 . The operating bar 22 forms an operating end 24 of a key body 26 (see figure 2 ), the key body is supported on the support body 28, which is arranged in the housing 10 on its side.

[0097] Bearing 30 is used to support button body 26, and this bearing has four hangers 32,34 in this embodiment (in figure 2 It is not possible to consider one of the two suspension elements 34), the four suspension elements are arranged to be distributed on two mutually parallel suspension planes 36, 38. The suspension parts 32 , 34 are arranged in pairs on the ends of the button body 26 arranged along the longitudinal extension of the operating bar 22 . The suspension remains fastened not only on the support body 28 but also on the key body 26 so that when a force is applied to the upper...

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Abstract

The capacitive sensor for detecting a relative movement of two adjacent bodies comprises a first electrode (76), which has a first electrically conducting electrode surface (78) and which is arranged on a first electrode supporting body (74), and a second electrode (86), which is opposite the first electrode (76), has a second electrically conducting electrode surface (88) and is arranged on a second electrode supporting body (82). The second electrode supporting body (82) is designed as a resilient film element (84) that is supported on the first electrode supporting body (74) on two spaced-apart opposing support sections (96) on both sides of the two electrodes (76, 86). The capacitive sensor further comprises a pressure body (92) on the side of the electrode supporting body (82) facing away from the second electrode (86). Said pressure body (92) comprises at least two pressure projections (94) that rest, in the region between the support sections (96) of the second electrode supporting body (82), against the side of the second electrode supporting body facing away from the second electrode (86) and that press against the second electrode supporting body (82) while bending it when there is a relative movement between the first electrode supporting body (74)and the second pressure body (92). The at least two pressure projections (94) are spaced apart from each other in the same spatial direction in which the support sections (96) of the second electrode supporting body (82) are spaced apart. The second electrode (86) is secured to the second electrode supporting body (82) only in a securing section that is substantially in the center between the pressure regions of the second electrode supporting body (82) in which the pressure projections (94) rest against the second electrode supporting body (82).

Description

technical field [0001] The invention relates to a capacitive sensor for detecting the relative motion of two adjacent objects as they approach or move away. Background technique [0002] Capacitive sensors are used, for example, as pressure, force or displacement sensors. In order to be able to detect small relative movements of two adjacent objects with the aid of a capacitive sensor, a reliable distinction of changes in the electrode spacing within the sensor is required, which can be problematic especially with relatively small movements and changes in the spacing. One can amplify the sensor's electrical signal in order to achieve better discrimination. In the case of very small deformation displacements, which should be detected with capacitive sensors, however, considerable amplification is required, wherein one then touches the limits of the electronic device, which relates to the noise performance of the electronic device. Contents of the invention [0003] It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/241
CPCG01L1/142G01D5/2417
Inventor 卡斯滕·马夸斯
Owner BEHR HELLA THERMOCONTROL
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