3D Position Sensor Cast Body Geometry for Centroid Shift Reduction
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Solution Overview
Problem
Conventional sensors used in virtual reality systems for 3D position detection suffer from systematic deviations in measured position due to angle of incidence, leading to positional inaccuracies and increased computing effort, which limits the precision and battery life of user devices.
Innovation Solution
A sensor system with optimized geometric properties and a transmissive cast body that minimizes centroid shift, allowing for precise detection of radiation angles and reduced computational corrections, thereby enhancing positional accuracy and reducing computing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors are used for 3D position detection, then the system can detect radiation, but systematic deviations occur due to angle of incidence leading to positional inaccuracies
Solution Approach 1:
The patent changes the geometric parameters of the sensor chip, specifically optimizing the ratio between chip width and thickness. By adjusting these physical dimensions, the sensor achieves reduced centroid shift at oblique angles of incidence, thereby improving measurement precision while maintaining reliability across different detection angles.
2Measurement precision
If conventional sensors with larger centroid shift are used, then manufacturing is simpler, but positional accuracy decreases and computing effort increases
Solution Approach 1:
The patent optimizes specific geometric parameters of the sensor chip (width-to-thickness ratio) to inherently reduce centroid shift. This design approach minimizes the need for complex post-processing corrections while achieving high positional accuracy, thus improving measurement precision without proportionally increasing device complexity.
3Measurement precision
If extensive algorithmic corrections are applied to compensate for centroid shift, then positional accuracy can be improved, but computing effort and processing time increase
Solution Approach 1:
The patent implements preliminary action by designing the sensor chip geometry in advance to minimize centroid shift at the source. This proactive design approach reduces the magnitude of deviations before they occur, thereby decreasing the need for extensive algorithmic corrections and reducing computing effort and energy consumption during operation.
4Duration of action of moving object
If sensors with high centroid shift are used, then device complexity is lower, but battery life is reduced due to increased computing requirements
Solution Approach 1:
The patent modifies the sensor chip's physical parameters (width and thickness ratio) to reduce centroid shift. This design change improves positional accuracy while simultaneously reducing the computing power required for correction, thereby extending battery life in portable devices without sacrificing measurement precision.
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
The sensor system achieves higher positional accuracy with reduced computing effort, extending battery life and enabling faster position data updates, while minimizing the need for extensive algorithmic corrections.
Implementation Method 1
The sensor chip is configured for the detection of a radiation
Implementation Method 2
The cast body is translucent for the radiation to be detected, in particular transmissive and non-scattering
Data Source
AI summary
A sensor and a 3-D position detection system are disclosed. In an embodiment a sensor includes at least one sensor chip configured to detect radiation, at least one carrier on which the sensor chip is mounted and a cast body that is transmissive for the radiation and that completely covers the sensor chip, wherein a centroid shift of the sensor chip amounts to at most 0.04 mrad at an angle of incidence of up to at least 60°, wherein the cast body comprises a light inlet side that faces away from the sensor chip, and the light inlet side comprises side walls bounding it on all sides, wherein the side walls are smooth, planar and transmissive for the radiation, wherein a free field-of-view on the light inlet side has an aperture angle of at least 140°, and wherein the cast body protrudes in a direction away from the sensor chip beyond a bond wire.