Proximity Sensor Optical Path Noise Reduction
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Solution Overview
Problem
Proximity sensors in mobile communication devices face challenges with noise interference and limited power consumption, which affect their accuracy and efficiency in detecting targets.
Innovation Solution
Incorporating microprism arrays and microlens arrays in the optical path of proximity sensors to focus light emitted and reflected, enhancing the scanning scope and field-of-view while optimizing power usage through ambient light sensing and adaptive energy control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If proximity sensors are used in mobile communication devices, then target detection capability is provided, but noise interference increases and power consumption rises
Solution Approach 1:
The patent segments the optical path into multiple controlled sections using microprism arrays and microlens arrays. These optical elements divide the light collection into specific angular ranges, separating target reflection signals from background noise sources. The microprisms segment the field of view into discrete directional channels, allowing selective detection while filtering out unwanted noise from other directions.
Solution Approach 2:
The patent applies local quality by positioning specific optical elements (microprisms and microlenses) at precise locations within the sensor assembly. Each optical element is configured with specific geometric properties to handle light from particular angular zones. This localized optical processing ensures that only light from the desired target direction is focused onto the detector, while noise from other directions is excluded.
2Reliability
If proximity sensors operate continuously, then target detection is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action through adaptive power management that controls when the proximity sensor activates. The sensor can operate in periodic measurement cycles rather than continuously, with activation triggered by specific conditions such as detected ambient light changes or communication events. This periodic operation maintains detection reliability while significantly reducing average power consumption during idle periods.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting sensor operating parameters based on environmental conditions. The system monitors ambient light levels and communication state to modulate the sensor's activation and measurement frequency. When ambient conditions indicate low noise or stable proximity conditions, the sensor reduces its activity, changing operational parameters to minimize energy consumption while maintaining adequate detection capability.
3Adaptability or versatility
If microprism arrays and microlens arrays are added to the optical path, then scanning scope and field-of-view are enhanced, but device complexity increases
Solution Approach 1:
The patent merges multiple optical functions into a single integrated assembly. The microprism array and microlens array are combined in a compact configuration where they work together as a unified optical system rather than separate components. This merging allows the enhanced scanning scope and field-of-view capabilities to be achieved within a space-efficient design that minimizes overall device complexity despite the advanced functionality.
Solution Approach 2:
The patent employs another dimension by utilizing angular and spatial dimensions through the microprism geometry. The microprisms are configured with specific facet angles and orientations that redirect light from multiple angular directions onto the detector. This dimensional approach to light manipulation expands the effective scanning scope without requiring physically larger sensor components, thereby managing device 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 improves the accuracy and efficiency of proximity sensors by reducing noise interference and optimizing power consumption, allowing for better target detection with enhanced scanning capabilities and reduced energy expenditure.
Implementation Method 1
Incorporating microprism arrays and microlens arrays in the optical path of proximity sensors to focus light emitted and reflected
Implementation Method 2
detect light, including light emitted by the light source and reflected from the first target area
Data Source
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AI summary
A proximity sensor assembly. The proximity sensor assembly including a light source, a detector, and a light focusing device. The light source operative to emit light toward a target area. The detector operative to detect light, including light from the light source reflected from the target area. The light focusing device in an optical path between the light source and the detector, the optical path including the path of light from the light source reflected from the target area.