Adjustable Lens Optical Projector for 3D Depth Sensing
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Solution Overview
Problem
Current three-dimensional image sensing technologies face challenges in accurately determining facial features of humans within a field of view using optical projector modules, which struggle to effectively project and concentrate light beams on target objects.
Innovation Solution
The implementation of a three-dimensional image sensing apparatus with an optical projector module that includes a lens unit with adjustable lenses and a light spots generating unit, allowing for controlled light spot density and structured light patterns, along with a rotation module and image processing unit to accurately project and focus light beams on targets, enabling precise depth calculation and feature recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed number of light beams are projected on a target object, then the optical projector module can maintain simple structure and operation, but it is difficult to determine facial features of a human in the field of view
Solution Approach 1:
The patent implements adjustable light beam density through movable lenses that can dynamically change the concentration of light spots on the target object. This dynamic adjustment allows the system to optimize between simple operation and precise facial feature measurement by varying the light spot density according to measurement requirements
Solution Approach 2:
The system changes the parameter of light beam density by adjusting the position of lenses in the lens unit. By modifying the density parameter, the optical projector can achieve both simple operation modes (lower density) and precise facial feature determination modes (higher density), resolving the contradiction between simplicity and measurement accuracy
2Measurement precision
If light beams are projected with fixed density, then the optical projector module can maintain simple operation, but it cannot accurately concentrate light on target objects for precise depth calculation
Solution Approach 1:
The patent employs dynamically adjustable lenses that can modify light spot density in real-time. This dynamic capability enables the system to switch between simple operation (fixed or lower density) and precise depth calculation (adjusted higher density), eliminating the need for multiple fixed-density projection systems
Solution Approach 2:
The optical projector module integrates multiple functions by incorporating adjustable density capability into a single device. The same lens unit can serve both simple projection operations and precise depth measurement operations by adjusting light beam density, reducing the need for separate specialized devices
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 allows for accurate projection and concentration of light beams onto targets, enhancing the ability to determine facial features and calculate depth information, improving the overall effectiveness of three-dimensional image sensing systems.
Implementation Method 1
The lens unit receives a number of light beams B from the light spots generating unit
Implementation Method 2
the lens unit is configured to concentrate the light beams B on the target object
Implementation Method 3
The optical member is disposed in a light path of the light sources for receiving light beams from the light sources
Data Source
AI summary
An optical projector module to establish distance to target object in a field of view for three dimensional image acquisition purposes includes a printed circuit board, point light sources mounted on the printed circuit board to emit a plurality of light beams, a lens unit apart from the plurality of point light sources, and a distance adjusting unit connected to the lens unit. A memory storage device is also included. The lens unit comprises separated lenses, the adjusting unit can adjust distances between the lenses of the lens unit, and light beams with a number of light spot patterns can accordingly be projected. Previously-captured images in the memory storage device can be referred to in seeking target objects in the field of view and light beams in different spot-concentrations on or around the target object enable calculations for the capture of images in three dimensions of the target object.