Beam Projection Condensing Lens with Cut Surface to Reduce Leakage
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Solution Overview
Problem
Existing beam projection apparatuses suffer from light leakage due to stray reflections, which degrade image projection or lighting quality and reduce brightness when traditional light blocking methods are used to mitigate these leaks.
Innovation Solution
The apparatus employs a condensing lens with an asymmetrical portion featuring a cut surface and a light source positioned corresponding to this surface, combined with a wavelength conversion component and a micromirror component to guide light along a specific axis, minimizing light leakage paths and optimizing internal space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking sheet is placed at the bottom position in front of the projection lens to block leakage paths, then the light leakage problem is solved, but the overall brightness of the beam projection apparatus is reduced
Solution Approach 1:
The patent extracts the harmful light leakage paths by introducing a cut surface on the condensing lens that specifically blocks the leakage paths while preserving the main light transmission path. This selective extraction allows the system to eliminate stray reflections without blocking the useful light, thereby maintaining overall brightness while solving the light leakage problem.
Solution Approach 2:
The cut surface on the condensing lens applies local quality by creating a specific geometric feature at a particular location on the lens. This localized modification blocks light leakage paths in specific directions while leaving the rest of the lens transparent, thus selectively preventing harmful light leakage without affecting the overall brightness of the system.
2Object-affected harmful factors
If traditional light blocking methods are used to mitigate light leakage, then light leakage is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the light blocking function with the existing condensing lens by integrating a cut surface directly into the lens structure. This combination eliminates the need for separate light blocking components such as additional sheets or filters, thereby reducing device complexity while still effectively mitigating light leakage.
Solution Approach 2:
The condensing lens with the cut surface performs multiple functions: it still serves as the primary condensing element for the light source while simultaneously acting as a light blocking element for stray reflections. This multi-functionality reduces the number of separate components needed, thereby simplifying the overall device structure while effectively addressing light leakage.
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 design effectively reduces light leakage, enhances image projection quality, and improves brightness while allowing for a thinner, more efficient beam projection apparatus design.
Implementation Method 1
a wavelength conversion component 3 (e.g., a color wheel partially coated with a phosphor layer) to be converted into another excited color light
Implementation Method 2
The at least one condensing lens has a lens portion and an asymmetrical lens portion, and the asymmetrical lens portion extends from the lens portion and has a cut surface
Implementation Method 3
The micromirror component is disposed on another side of the condensing lens relative to the wavelength conversion component
Data Source
AI summary
A beam projection apparatus includes a light source, micromirror component, a light guide lens set, a projection lens, a condensing lens with a lens portion and an asymmetrical lens portion extending from the lens portion and having a cut surface, and a wavelength conversion component disposed at a side of the condensing lens for at least partially converting a wavelength of a color light and reflecting the color light to the condensing lens. The light source is disposed corresponding to the cut surface and emits the color light. The micromirror component is disposed at another side of the condensing lens relative to the wavelength conversion component. The light guide lens set is disposed on a light exit axis of the lens portion to guide the color light to be incident to the micromirror component for forming a projection beam. The projection lens receives the projection beam for optical projection.