LED Paraboloid Mirror Light Blocking Unit Color Uniformity
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Solution Overview
Problem
Existing light emitting devices using LEDs to create spot lights suffer from color unevenness due to uneven phosphor distribution, resulting in white light being produced in the front direction and yellow light in the wide-angle direction, leading to noticeable color discrepancies.
Innovation Solution
A light emitting device with a paraboloid-shaped reflecting mirror and a light blocking unit made of absorptive material, positioned to block light beyond a predetermined beam angle, ensuring that only focused light within the beam angle is reflected, thereby reducing color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a lens is used to focus light for narrow-angle emission, then the beam angle is reduced, but color unevenness becomes noticeable due to focusing yellow light along with white light
Solution Approach 1:
The patent segments the light path by introducing a light blocking unit that divides the optical path into two distinct regions: one for white light within the predetermined beam angle that reaches the reflecting mirror, and another for yellow light beyond the beam angle that is blocked. This segmentation prevents yellow light from being focused along with white light, thereby resolving color unevenness while maintaining narrow-angle emission.
Solution Approach 2:
The patent extracts or removes the harmful component (yellow light beyond the predetermined beam angle) from the optical system by using a light blocking unit. This allows only the desired white light within the specific beam angle to reach the reflecting mirror and form the spot light, eliminating the color unevenness problem caused by included yellow light.
2Area of stationary object
If phosphor is distributed to produce wide-angle yellow light, then the illumination coverage is increased, but color unevenness occurs in the spot light
Solution Approach 1:
The patent applies local quality by making the light blocking unit's blocking特性 spatially selective. It blocks yellow light only in the region beyond the predetermined beam angle while allowing white light within the beam angle to pass through to the reflecting mirror. This localized control of light transmission maintains both wide-angle phosphor distribution for coverage and color uniformity in the focused spot light.
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 suppresses color unevenness by blocking light beyond the ¼ beam angle, ensuring a clean and uniform narrow-angle circular spot light is produced, improving light distribution and reducing noticeable color discrepancies.
Implementation Method 1
a reflecting mirror that reflects light emitted by the light emitting unit and radiates the light outside and has a reflecting surface shaped in a paraboloid of revolution
Implementation Method 2
The light blocking unit may be made of a light absorptive material that absorbs the light beyond the predetermined beam angle
Data Source
AI summary
A light emitting device includes: an LED; a reflecting mirror that reflects light emitted by the LED and radiates the light outside and has a reflecting surface shaped in a paraboloid of revolution; and a light absorptive material that, of the light emitted by the LED, blocks the light beyond a 1/4 beam angle θ from being incident on the reflecting mirror. The LED is provided at a position displaced from a focal point of the paraboloid of revolution.