Proximity Detection Range Switching for User Presence Control
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Solution Overview
Problem
Existing electronic apparatuses using proximity sensors to detect user presence often boot up unnecessarily due to false detections from bystanders and struggle to accurately determine when a user has left, leading to security and power consumption issues.
Innovation Solution
The electronic apparatus includes a processing unit, a detection unit, and a detection range control unit that adjusts the detection range based on the operating state and detection state, setting a wider range for leave detection and a narrower range for approach detection to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed detection range is used for proximity detection, then the detection range control is simple, but the detection accuracy deteriorates due to false detections from bystanders and inability to distinguish user leave
Solution Approach 1:
The detection range is made dynamic rather than fixed. The detection range control unit adjusts the detection range based on the operating state (active or standby) of the electronic apparatus. When in standby state, a wider detection range is used to detect user approach; when in active state, a narrower detection range is used to detect user leave. This dynamic adjustment resolves the contradiction by adapting the detection range to different operational contexts, improving detection accuracy without requiring complex real-time analysis.
Solution Approach 2:
The detection range parameter is changed based on the operating state of the electronic apparatus. By switching between a first detection range (wider) for approach detection and a second detection range (narrower) for leave detection, the system achieves high detection accuracy. This parameter change approach allows the system to distinguish between bystanders and intended users by context, resolving the contradiction between accuracy and complexity.
2Reliability
If a wide detection range is used to detect user leave, then the detection coverage is improved, but false detections from bystanders increase
Solution Approach 1:
The detection range is dynamically adjusted based on the operating state. A wide detection range is used only when the apparatus is in standby state (for approach detection), while a narrow detection range is used when in active state (for leave detection). This temporal separation of detection ranges eliminates false detections from bystanders while maintaining reliable user leave detection, resolving the contradiction between reliability and false detections.
Solution Approach 2:
The system performs preliminary detection of user approach with a wide detection range before entering the active state. Once the user is detected and the apparatus is activated, the detection range is narrowed for subsequent leave detection. This preliminary action ensures that the wide detection range is only temporarily active when needed, preventing false detections while maintaining reliable user leave detection during the active period.
3Object-affected harmful factors
If a narrow detection range is used to avoid false detections, then the false detection rate is reduced, but the ability to detect user leave deteriorates
Solution Approach 1:
The detection range is dynamically switched between narrow and wide based on operating state. A narrow detection range is used during active operation to minimize false detections, while a wide detection range is activated temporarily during standby state to detect user approach and enable leave detection. This dynamic switching resolves the contradiction by providing the narrow range benefits during active use while periodically using the wide range for reliable leave detection capability.
Data Source
AI summary
An electronic apparatus includes: a processing unit which executes system processing; a detection unit which detects an object present within a predetermined detection range; an operation control unit which activates the operation of the processing unit when the object is detected within the predetermined range by the detection unit; and a detection range control unit which sets the predetermined detection range according to the operating state of the system processing.