Laser Despeckle Device Using Dynamic Element Movement
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Solution Overview
Problem
Current laser despeckle technologies require multiple despeckle elements to reduce light coherence, leading to increased projector volume and higher costs, as the effectiveness of a single despeckle element in improving speckle reduction is limited after initial passage of laser light.
Innovation Solution
A laser despeckle device that includes a light source, a despeckle element, and optical transmission modules, where the laser light passes through the despeckle element multiple times using optical transmission modules and an actuator to shake or rotate the despeckle element, reducing light coherence without the need for multiple despeckle elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple despeckle elements are used to reduce light coherence, then the speckle reduction effect is improved, but the projector volume increases
Solution Approach 1:
The patent employs an actuator to dynamically move the single despeckle element, transforming it from a static component to a dynamic one that can change its position and orientation. This dynamic capability allows the same element to provide multiple passage effects for the laser light, achieving enhanced speckle reduction without requiring multiple static despeckle elements, thus resolving the contradiction between speckle reduction effectiveness and projector volume.
Solution Approach 2:
The actuator performs periodic movement of the despeckle element, creating repeated passage opportunities for the laser light. This periodic action enables the single despeckle element to function multiple times in sequence, achieving the cumulative speckle reduction effect that would otherwise require multiple elements, thereby reducing the overall device volume while maintaining reliability.
2Reliability
If multiple despeckle elements are used to reduce light coherence, then the coherence reduction is improved, but the device complexity increases
Solution Approach 1:
By introducing dynamic movement capability to a single despeckle element through the actuator, the system achieves the functionality of multiple static elements with just one dynamic component. This reduces device complexity by eliminating the need to assemble, align, and maintain multiple despeckle elements while achieving equivalent or superior coherence reduction through the repeated passage effect.
Solution Approach 2:
The patent merges the functions of multiple despeckle elements into a single dynamic despeckle element. The actuator enables this single element to perform the work of multiple elements by creating multiple passage opportunities, thereby simplifying the overall device structure, reducing component count, and lowering assembly and maintenance complexity while maintaining coherence reduction effectiveness.
3Device complexity
If a single despeckle element is used, then the device simplicity is maintained, but the coherence reduction is insufficient
Solution Approach 1:
The actuator introduces dynamic movement to the single despeckle element, enabling it to create multiple passage effects for the laser light. This dynamic capability transforms the limited single-pass coherence reduction into multiple passes, significantly enhancing the coherence reduction effect while maintaining device simplicity and avoiding the complexity of assembling multiple elements.
Solution Approach 2:
The periodic movement of the despeckle element by the actuator creates repeated opportunities for the laser light to pass through the element. This periodic action accumulates coherence reduction effects over multiple passes, achieving the reliability of multiple elements while keeping the device simple and avoiding the complexity of managing multiple static components.
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 solution effectively reduces light coherence and speckle in laser projectors by allowing laser light to pass through a single despeckle element multiple times, thereby minimizing the need for additional despeckle elements and reducing projector volume while maintaining cost-effectiveness.
Implementation Method 1
The despeckle element is a diffusor
Implementation Method 2
The despeckle element is a diffusor
Implementation Method 3
The optical transmission modules include planar reflector or lens
Implementation Method 4
The optical transmission modules include planar reflector or lens
Implementation Method 5
the actuator is configured to shake the despeckle element
Implementation Method 6
the actuator is configured to translate the despeckle element
Data Source
AI summary
A laser despeckle device includes a light source, a despeckle element, and a plurality of optical transmission modules. The light source is configured to emit a laser light. The despeckle element is disposed along the optical axis of the laser light. The optical transmission modules alternatively disposed at two opposite sides of the despeckle element.