Light Guide Illumination Apparatus with Light Blocking Member
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Solution Overview
Problem
The existing image sensor units face challenges in maintaining uniform illuminance on an illuminated body due to the expansion and contraction of the light guide member caused by ambient temperature changes, leading to increased leak light and difficulty in achieving consistent illuminance.
Innovation Solution
The proposed solution involves an illumination apparatus with a light guide member and a light blocking member, where the light blocking member includes a protruding light blocking portion and a cut-out portion to expose part of the reflection surface, preventing direct emission of light and reducing leak light, even when the light guide member expands or contracts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is used to block leak light from the light source, then the direct emission of light toward the original is prevented, but the inner surface of the light blocking member reflects light that leaks from the free end side
Solution Approach 1:
The light blocking member is designed with a three-dimensional structure including a light blocking portion protruding toward the light source and a cut-out portion exposing part of the reflection surface. This spatial configuration blocks light from the light source while allowing reflected light to escape through the cut-out portion, resolving the contradiction between blocking and reflecting light
Solution Approach 2:
The cut-out portion extracts the problematic reflected light from the system by providing an escape path for light that would otherwise be reflected toward the original, separating the light blocking function from the light reflection issue
2Stability of the object's composition
If the light guide member is contracted due to ambient temperature, then the inner surface of the light blocking member is more exposed, but this causes more light to be directly reflected and increases leak light
Solution Approach 1:
The light blocking member's structure with the light blocking portion and cut-out portion is designed in advance to counteract the effect of light guide contraction. Even when the light guide contracts and exposes more of the light blocking member's inner surface, the pre-designed cut-out portion ensures that reflected light can escape and does not contribute to leak light
Solution Approach 2:
The light blocking member is designed to accommodate dynamic changes in the light guide member's length due to temperature variations. The structure remains effective whether the light guide is expanded or contracted, maintaining uniform illuminance across different thermal conditions
3Illumination intensity
If the light guide member expands or contracts due to ambient temperature, then the illuminance on the original becomes non-uniform, but maintaining uniform illuminance requires a complex light blocking structure
Solution Approach 1:
The light blocking member is segmented into distinct functional portions: a light blocking portion that blocks light from the light source, and a cut-out portion that allows reflected light to escape. This segmentation creates a relatively simple structure that effectively addresses illuminance uniformity without excessive complexity
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 configuration ensures uniform illuminance on the illuminated body by effectively blocking and redirecting light, minimizing leak light and maintaining consistent illumination regardless of temperature-induced changes in the light guide member's length.
Implementation Method 1
light emitted from the first light source and the second light source is propagated by a reflection surface and emitted to the illuminated body from an emission surface
Implementation Method 2
the light blocking member can block leak light directly emitted from between the free end of the light guide and the light source toward the original
Data Source
AI summary
An illumination apparatus includes: a rod-like light guide member that directs light emitted from a first light source and a second light source from an emission surface to an illuminated body while propagating the light by reflection surfaces; and a light blocking member including a second surrounding portion slidably covering another end of the light guide member, wherein the second surrounding portion includes: a light blocking portion protruding toward one end of the light guide member and covering the emission surface of the light guide member; and a cut-out portion adjacent to the light blocking portion and exposing the reflection surface of the light guide member.