Reflective Diffusion Device for Laser Speckle Reduction

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Solution Overview

Problem

Projection systems using lasers face the issue of speckle, which affects imaging quality, and existing solutions like static diffusion sheets or high-speed rotating diffusion wheels limit beam path layout and space utilization.

Innovation Solution

A reflective diffusion device with a reflecting member and a diffusing member, where the excitation light beam is incident, reflected, and diffused, maintaining parallel direction to the central axis, allowing both incident and exit beams to be on the same side, facilitating space utilization and improved light path design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a static diffusion sheet or high-speed rotating diffusion wheel is used to eliminate speckle, then the imaging quality is improved, but the beam path layout is limited and space utilization is reduced

Engineering Contradiction:

Improveimaging qualityVSAvoidspace utilization

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent inverts the conventional transmission-based diffusion approach by using a reflective diffusion device. The light beam reflects off the diffusing member rather than transmitting through it, allowing the incident and exit beams to be located on the same side of the device. This inversion resolves the spatial constraint while maintaining the speckle elimination function.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the optical path configuration from a linear transmission path (incident beam enters one side, exits the other) to a reflective path where both incident and exit beams are on the same side. This dimensional reconfiguration of the light path enables more flexible beam path layout and improves space utilization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If a static diffusion sheet or high-speed rotating diffusion wheel is used to eliminate speckle, then the imaging quality is improved, but the device complexity increases

Engineering Contradiction:

Improveimaging qualityVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the high-speed rotation mechanism from the diffusion device, using only a static diffusing member. By removing the rotating mechanism while maintaining the speckle elimination effect through the reflective diffusion design, the device complexity is significantly reduced while preserving the imaging quality improvement.

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If the incident and exit beams are located on opposite sides of the diffusion device, then the diffusion function is achieved, but the beam path layout is limited

Engineering Contradiction:

Improvediffusion functionVSAvoidbeam path layout

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #13The other way round (Inversion)

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 reflective diffusion device effectively reduces speckle by diffusing the light beam, improving imaging quality and allowing for more flexible and compact projection device designs, with a potential volume reduction of over 10% compared to conventional systems.

Implementation Method 1

is reflected by the reflective surface of the reflecting member

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

is then reflected by the reflective surface to maintain the excitation light beam or form a diffused light beam

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS20240077793A1Reflective diffusion device and projection device

Publication Date: 2024.03.07 CORETRONIC CORPORATION

AI summary

A reflective diffusion device including a reflecting member and a diffusing member is provided, which are adapted for reflecting and diffusing an excitation light beam emitted from a light source module. The reflecting member has a central axis and includes a reflective surface facing the light source module. The diffusing member is disposed on a portion of the reflective surface of the reflecting member. The excitation light beam is incident on a first position of the reflective diffusion device in an incident direction parallel to the central axis, is reflected by the reflective surface and transmitted to a second position of the reflective diffusion device, and is then reflected by the reflective surface to maintain the excitation light beam or form a diffused light beam. The excitation light beam or the diffused light beam exits from the reflective diffusion device in an exit direction parallel to the central axis.