Audio Jack Detection Terminals for Lint Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic devices face detection failures due to lint, dust, or other particles interfering with movable elements in audio jacks, leading to incorrect insertion or removal detection of audio accessories, which affects device performance.
Innovation Solution
The use of spaced detection terminals at the tip-end of the audio jack, which short when an audio accessory is inserted, and a detection circuit to monitor this short, along with methods like bias voltage application, controlled current, inaudible tones, and zero-crossing detection to reliably determine accessory presence or absence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If movable elements are used in audio jacks for detection, then insertion or removal detection can be achieved, but detection failures occur due to lint, dust, or other particles interfering with the movable elements
Solution Approach 1:
The patent removes the movable element from the audio jack structure, extracting the source of particle interference. Instead of using a movable detection element that can be blocked by lint and dust, the invention uses fixed detection terminals that sense accessory presence through electrical contact changes, eliminating the mechanical component vulnerable to contamination.
Solution Approach 2:
The patent replaces the mechanical detection system with an electrical detection system. Rather than relying on physical movement of elements within the jack, the invention uses electrical signals and resistance changes at fixed terminals to detect accessory insertion and removal, substituting mechanical principles with electrical ones to avoid particle interference.
2Area of stationary object
If detection terminals are placed close together in the audio jack, then the structure is compact, but contaminants can lodge between terminals causing detection errors
Solution Approach 1:
The patent applies local quality by positioning detection terminals at specific locations within the audio jack structure - at the tip-end where they will be shorted by the accessory plug. This strategic placement allows for both compact overall design and reliable detection, as the terminals are positioned where they will be reliably contacted by the accessory while maintaining appropriate spacing to prevent particle interference.
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 approach enhances the reliability of detecting audio accessory insertion or removal, reducing false readings and interference from contaminants and audio signals, thereby improving device operational states and user convenience.
Implementation Method 1
the detection terminals are spaced apart and configured to be shorted by the audio accessory when coupled to the electronic device
Implementation Method 2
A user connects the headset audio accessory to the electronic device by inserting the audio plug on the headset into the audio jack on the electronic device
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
According to one aspect, an electronic device for detecting an audio accessory. The electronic device includes an audio jack having at least two detection terminals. The detection terminals are spaced apart and positioned within a socket of the audio jack so when an audio plug of the accessory is inserted into the socket of the audio jack, the detection terminals will be shorted. The presence of a short between the detection terminals is indicative that the audio accessory is present.