Non-Uniform Light Density Projector for Remote Charging Control
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Solution Overview
Problem
Existing projectors lack the ability to vary light density across the image, wasting energy in applications where only a small fraction of pixels is active, and there is a need for programmable non-uniform light density.
Innovation Solution
A projector using modified adaptive optical elements that modify light density distribution across its light modulator, allowing active parts to receive high light density and non-active parts minimal illumination, achieved through mechanical motion of the DOE and additional lenses, and optionally using multiple laser beams and a camera for control loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If uniform light density is used across the light modulator, then all pixels are illuminated equally, but a lot of light energy is wasted when only a small fraction of pixels is active
Solution Approach 1:
The patent applies local quality by enabling different regions of the light modulator to receive different light densities. The system uses a spatial light modulator to modulate the light beam, creating variable light density distribution across the modulator surface. This allows active pixels to receive high light density while inactive pixels receive minimal illumination, thereby reducing overall light energy waste while maintaining the flexibility to program different illumination patterns as needed.
2Loss of energy
If variable light density is implemented across the light modulator, then energy efficiency improves for selective pixel activation, but device complexity increases
Solution Approach 1:
The patent implements universality by using a spatial light modulator that can perform multiple functions: it modulates light density across different regions, steers the light beam to different areas, and can be programmed to create various illumination patterns. This single device replaces what would otherwise require multiple separate optical components, achieving variable light density control while limiting the increase in overall device complexity.
3Illumination intensity
If mechanical motion of DOE and lenses is used to modify light density distribution, then light density can be varied across the modulator, but system complexity and potential instability increase
Solution Approach 1:
The patent applies mechanics substitution by replacing the need for complex mechanical positioning systems with a spatial light modulator that uses electro-optic or other non-mechanical means to modulate light density. The SLM can be electrically programmed to create different illumination patterns without requiring physical movement of optical elements, thereby achieving variable light density distribution while reducing mechanical complexity and potential instability from moving parts.
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 efficient energy use by recycling unused light and providing continuous charging to drones or mobile devices, enhancing energy efficiency and extending their operation time without the need for charging stations.
Implementation Method 1
DOE—Diffractive Optical Element as defined in the Photonic Encyclopedia
Implementation Method 2
Spatial Light Modulator—A spatial light modulator (SLM) is an object that imposes some form of spatially varying modulation on a beam of light
Data Source
AI summary
This invention teaches an optical digital projector with non-uniform light density and ways it can be used to remotely charge a target. According to this invention, multiple DOEs fed by multiple laser beams can be used to create multiple rectangles by the optical modulator. In one embodiment of this invention, the FOP can be changed—zoomed in and out and offset in X and Y by moving a projection lens in front of the optical modulator. A camera, pointed at a remote object, is used to close a control loop homing the modified rectangle of light on the remote target.