Sensor and / or sound detection device and manufacturing method for a sensor and / or sound detection device

A deformable membrane with a sealing ring or annular projection and a cover layer ensures liquid-tight sealing in sensor and sound detection devices, addressing the challenge of maintaining waterproof integrity while allowing air exchange, enhancing reliability and reducing manufacturing complexity and cost.

DE102017210598B4Active Publication Date: 2026-06-03ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2017-06-23
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

Existing sensor and sound detection devices face challenges in maintaining liquid-tight and waterproof integrity while allowing air and gas exchange through access channels, leading to potential ingress of liquid or water, which compromises their functionality and increases manufacturing complexity and cost.

Method used

A passive sealing mechanism is implemented using a deformable membrane with a sealing ring or annular projection that closes the access channel upon wetting, ensuring liquid-tight sealing without the need for actuators or control units, combined with a cover layer that is either permeable to air and gas or water-repellent to prevent ingress.

Benefits of technology

The solution provides reliable liquid-tight and waterproof protection for sensor and sound detection devices, ensuring functionality even when exposed to water, while maintaining air and gas exchange, and simplifies manufacturing by eliminating the need for complex control systems, thus reducing costs.

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Abstract

Sensor and / or sound detection device with: a sensing device (10) with a sensitive surface (12) which is designed such that a change in at least one physical quantity and / or at least one chemical concentration at the sensitive surface (12) causes a change in a sensor signal output by or tapped from the sensing device (10); wherein at least one access channel (18) in the sensor and / or sound detection device is designed such that, at least as long as the at least one access channel (18) is open, air and / or at least one gas can be transferred through the at least one access channel (18) between a spatial environment of the sensor and / or sound detection device and the sensitive surface (12); characterized by at least one at least partially water-impermeable membrane (20) with an inner membrane surface (20a) oriented towards the at least one associated access channel (18), wherein at least one contact surface (22) of the respective membrane (20) located on the respective inner membrane surface (20a) is pressed against at least one associated membrane contact surface (24) on the at least one associated access channel (18) by deformation of the respective membrane (20) when a membrane outer surface (20b) of the respective membrane (20) or a cover layer (40) located on the respective membrane outer surface (20b) is wetted with at least a minimum quantity of liquid, such that the at least one associated access channel (18) is sealed liquid-tight, wherein the at least one membrane (20) is designed such that, if the respective membrane outer surface (20b) or cover layer (40) is not wetted,the respective membrane (20) is in its initial position and the at least one associated access channel (18) is kept open via at least one open intermediate gap between the at least one contact surface (22) of the respective membrane (20) in its initial position and the at least one associated membrane contact surface (24) on the at least one associated access channel (18).
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