Beam Projection Optics for Stray-Light Control Without Brightness Loss

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Solution Overview

Problem

Existing beam projection apparatuses suffer from light leakage due to stray reflections, which degrade image projection and lighting quality, and traditional light blocking methods reduce brightness.

Innovation Solution

A beam projection apparatus design incorporating a reflective-transmissive component with a dichroic region and reflective region partially overlapping a condensing lens, allowing color light to pass through and reflect back to prevent stray reflections, combined with a micromirror component and light-guide lens set to form a projection beam.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a light blocking sheet is placed to block leakage paths, then light leakage is prevented, but overall brightness is reduced

Engineering Contradiction:

Improvelight leakageVSAvoidoverall brightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The condensing lens is divided into a first lens portion and a second lens portion, with the reflective-transmissive component partially overlapping only the first lens portion. This segmentation allows selective control of light paths without blocking all light, preventing light leakage while maintaining brightness through the second lens portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reflective-transmissive component is positioned to partially overlap only the first lens portion rather than the entire condensing lens. This local application allows the component to address light leakage in specific areas while leaving other areas (second lens portion) transparent for light transmission, thus maintaining overall brightness.

Inventive Principle:

Principle #3Local quality

2Loss of energy

If a reflective-transmissive component is partially overlapped with the condensing lens, then light leakage is prevented and light utilization efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvelight utilization efficiencyVSAvoidoptical component arrangement

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The reflective-transmissive component integrates both reflective and transmissive functions in a single element. The dichroic region allows color light to pass through while the reflective region reflects stray light back through the first lens portion, combining multiple functions in one component to reduce the need for separate elements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The reflective-transmissive component serves multiple functions: it acts as a partial barrier to prevent light leakage, a reflector to redirect stray light, and a transmissive element for the dichroic region. This multi-functionality reduces the number of separate components needed in the optical system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively prevents light leakage, enhances image projection and lighting quality, and improves light utilization efficiency while maintaining brightness.

Implementation Method 1

a wavelength-conversion component (18), disposed on a side of the at least one condensing lens (12)... for at least partially converting a wavelength of the color light transmitted from the first lens portion (26) and reflecting the color light to the at least one condensing lens (12)

Methodology Applied

Scientific EffectWavelength conversion: Fluorescence

Implementation Method 2

the reflective region (32) is located on at least side of the dichroic region (30) to reflect the color light reflected from the wavelength-conversion component (18)

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

The dichroic region (30) allows the color light to pass therethrough to be incident to the first lens portion (26)

Methodology Applied

Scientific EffectDichroic filtering: Dichroic Filter

Data Source

PatentUS20250298302A1Beam projection apparatus and projector thereof

Publication Date: 2025.09.25 QISDA CORP

AI summary

Abeam projection apparatus includes a light source, a condensing lens, a wavelength-conversion component, a reflective-transmissive component, a micromirror component, a light-guide lens set and a projection lens. The wavelength-conversion component at least partially converts a wavelength of a color light transmitted from the condensing lens and reflects the color light to the condensing lens. The reflective-transmissive component is partially overlapped with the condensing lens and has a dichroic region and a reflective region. The dichroic region allows the color light to pass therethrough to be incident to the condensing lens. The reflective region reflects the color light reflected from the wavelength-conversion component back to the reflective-transmissive component, to make the color light incident to the wavelength-conversion component again through the condensing lens. The light-guide lens set guides the color light to the micromirror component to form a projection beam incident to the projection lens for optical projection.