Camera Module 3D Sensor Dynamic Laser Emission Angle Adjustment
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Solution Overview
Problem
Portable camera modules, such as those in mobile devices, face challenges in accurately sensing three-dimensional information due to limitations in laser power and field of view, where increasing laser power for longer distances increases noise and decreases accuracy for closer objects, and widening the laser emission angle for a wider field of view reduces precision.
Innovation Solution
A camera module with an adjustable laser emission angle based on the distance between the camera module and the object, using an actuator controller and a diffuser that adjusts the distance between a light source and a diffuser, allowing for auto focusing and field of view adjustments to optimize 3D information capture without increasing laser power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser power is increased to sense 3D information at longer distances, then measurement precision is improved, but noise component increases and accuracy deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the laser emission angle based on the distance to the object. When the object is far, the emission angle is widened to increase laser power per unit area. When the object is close, the emission angle is narrowed to concentrate laser power and reduce noise. This dynamic adjustment resolves the contradiction between measurement precision and noise generation.
Solution Approach 2:
The patent changes the emission angle parameter of the laser based on object distance. By adjusting this parameter dynamically, the system optimizes the balance between laser power distribution and noise reduction, achieving accurate 3D sensing at various distances without excessive noise.
2Measurement precision
If laser emission angle is decreased to increase laser power per unit area, then measurement precision is improved, but field of illumination is narrowed and field of view is reduced
Solution Approach 1:
The system dynamically adjusts the laser emission angle based on the measured or estimated distance to the object. When the object is far away, a wider emission angle is used to cover larger area and maintain field of view. When the object is close, a narrower emission angle concentrates power while still covering the target area. This dynamic adaptation resolves the contradiction between precision and field of illumination.
3Adaptability or versatility
If laser emission angle is increased to secure wide field of view, then adaptability is improved, but laser power per unit area decreases and measurement precision deteriorates
Solution Approach 1:
The patent employs dynamic adjustment of the laser emission angle based on object distance. For distant objects, a wider emission angle provides wide field of view and adaptability. For close objects, the emission angle is narrowed to concentrate laser power and improve measurement precision. This distance-based dynamic adjustment resolves the contradiction between adaptability and 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
Enables accurate 3D information capture across varying distances without increasing laser power, maintaining uniform laser density and rapidly adjusting the field of view based on focus information, simplifying the camera module structure.
Implementation Method 1
The ToF sensor emits an infrared ray laser toward an object, receives a laser beam reflected from the object, and measures a time difference therebetween to obtain 3D information of the object
Implementation Method 2
a diffuser disposed on the light source
Data Source
AI summary
A camera module which includes an image sensor, a three-dimensional (3D) sensor, a pre-processor, and an actuator controller. The pre-processor may be suitable for receiving image information from the image sensor, generating an auto focusing control signal based on the image information, and providing an auto focusing control signal to the actuator controller. The actuator controller may be suitable for receiving the auto focusing control signal, generating an actuator driving signal based on the auto focusing control signal, and providing the actuator driving signal to the 3D sensor. The 3D sensor may be suitable for adjusting a field of view (FOV) based on the actuator driving signal.