Light Blocking Member for Traffic Light Ambient Reflection Control
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Solution Overview
Problem
Conventional traffic light devices with surface light sources suffer from ambient light reflection, misleading viewers and potential damage to internal components due to focused light, which affects road safety and component integrity.
Innovation Solution
A light emitting device comprising a casing with a light blocking member, such as a light shielding cap or absorption grating, that blocks ambient light in a multi-reflection or absorbent manner, reducing reflection and altering the focused position of incident light to prevent damage to internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lens part is used in the front cover to emit light, then light emission efficiency is improved, but ambient light is focused onto internal components causing high temperature and potential damage
Solution Approach 1:
A light blocking member is introduced as an intermediary element between the lens part and internal components. This member selectively blocks focused ambient light from reaching internal components while allowing emitted light to pass through, thereby mediating between the beneficial light emission function and the harmful heat focusing effect
Solution Approach 2:
The light blocking member is divided into multiple cavity structures that are distributed around the accommodation opening. Each cavity structure independently blocks light in a multi-reflection manner, collectively providing comprehensive protection against focused ambient light while maintaining light emission functionality
2Illumination intensity
If a lens part is used in the front cover, then light emission is improved, but reflected ambient light misleads viewers affecting road safety
Solution Approach 1:
The light blocking member serves as an intermediary that selectively blocks reflected ambient light from exiting the front cover while allowing emitted light to pass through. This mediator prevents the harmful reflection effect without interfering with the beneficial light emission function
Solution Approach 2:
The light blocking member is positioned specifically at locations where reflected light would exit the device, while maintaining transparency or openness in directions where emitted light needs to pass through. This local differentiation allows the device to simultaneously achieve good light emission and minimize harmful reflections
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 ambient light reflection, preventing viewer misperception and protecting internal components from heat damage by redirecting the focal point away from sensitive areas.
Implementation Method 1
Each of the plurality of cavity structures blocks the ambient light incident into the casing in a multi-reflection manner
Implementation Method 2
a surface of the light blocking member is coated with a light absorbing material
Implementation Method 3
the light emitting device further includes a Fresnel lens disposed on the light blocking member to straighten a beam emitted by the light emitting unit
Implementation Method 4
the light blocking member is a light absorption grating and blocks the ambient light incident into the casing in an absorbent manner
Data Source
AI summary
A light emitting device includes a casing, a light blocking member, and a light emitting unit. The light blocking member is disposed within the casing, and is adapted to block an ambient light incident into the casing. The light emitting unit is disposed within the casing.