Diving Computer Bezel Antenna and Water Detection
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Solution Overview
Problem
Metallic enclosures in electronic devices, such as diving computers, pose challenges for RF antenna performance due to their shielding effect, and existing solutions often require additional apertures or holes for water detection, which are undesirable for sealing and waterproofing.
Innovation Solution
A water contact detector circuit is integrated within the device, utilizing a conductive bezel and radiator element with a low-pass filter, allowing for underwater condition detection without the need for extra apertures, by establishing a conductive path through a button or surface, and enabling wireless communication and mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal housing is used for aesthetic benefits and structural integrity, then the device appearance and strength are improved, but the metal housing acts as an RF shield that degrades antenna performance
Solution Approach 1:
The housing is segmented into conductive and non-conductive portions. The bezel is made conductive to serve as the antenna ground plane, while the main housing body remains non-conductive to allow RF signal propagation. This segmentation resolves the contradiction by localizing the metal component only where structurally and aesthetically needed, while preserving antenna performance in the RF-critical regions.
Solution Approach 2:
Different portions of the housing have different electrical properties. The bezel is specifically made conductive to function as part of the antenna system, while the main housing body is non-conductive to permit RF wave propagation. This local differentiation allows the metal housing to provide strength and aesthetics without degrading overall antenna performance.
2Adaptability or versatility
If apertures are added to the housing for water detection, then water contact detection capability is improved, but the housing sealing and waterproofing are compromised
Solution Approach 1:
The conductive bezel serves multiple functions: it provides structural support, enables wireless communication as part of the antenna system, and detects water contact through its conductive properties. By making the bezel multi-functional, the patent eliminates the need for separate water detection apertures, thereby maintaining housing sealing while achieving water detection capability.
Solution Approach 2:
The water detection function is merged with the existing conductive bezel structure. The bezel's conductivity, already required for antenna operation, is also utilized for water contact detection. This merging of functions allows water detection without adding separate components or apertures that would compromise waterproofing.
3Reliability
If the bezel is made conductive for antenna ground plane, then wireless communication is improved, but water contact detection becomes more complex
Solution Approach 1:
The conductive bezel serves itself for dual purposes: it provides the ground plane for wireless communication and simultaneously acts as the sensing element for water contact detection. The same conductive structure that enables RF communication also detects water contact through changes in its electrical properties, eliminating the need for separate detection circuits and reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively detects underwater conditions without compromising the waterproof seal, ensuring reliable operation and efficient wireless communication in metal-encased devices.
Implementation Method 1
a low-pass filter comprising at least an inductor connected at one end to said conductive coupling and at the other end to a ground potential of the diving computer
Implementation Method 2
a low-pass filter comprising at least an inductor connected at one end to said conductive coupling
Implementation Method 3
a conductive bezel and a body, said bezel including a radiator element... a water contact surface extending through said body, said water contact surface being at least in part conductive... establishing a conductive path through a button or surface
Data Source
AI summary
A diving computer with coupled antenna and a water contact assembly is disclosed. The diving computer has at least one radiator element located on or connected to an outermost surface of a bezel of the diving computer and a radio unit having a conductive coupling to said radiator element, for enabling wireless communication between said diving computer and external devices. A conductive water contact surface extends through the housing of the diving computer and a water contact detector circuit is arranged, as a part of an underwater condition sensing circuit, to sense an underwater condition of the device. When water establishes a current path through said underwater condition sensing circuit from the water contact surface to ground, the sensing circuit provides an indication of an underwater condition to the diving computer.