LED Bulb Truncated Cone Reflector Base Light Distribution
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Solution Overview
Problem
Conventional LED illumination devices suffer from poor light distribution characteristics, particularly lacking sufficient luminous intensity in the base-side direction due to structural limitations and directivity of LED light emission, which restricts their ability to match the light distribution of incandescent lamps.
Innovation Solution
The implementation of a light source device with a truncated cone-shaped reflecting member positioned at the center of a substrate, where the side face of the reflecting member makes an acute exterior angle with the substrate, and LED chips are arranged to surround it, allowing light to be reflected towards the mounting base side, thereby enhancing light distribution angle without complex structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED chips are arranged on a substrate with metal frames for wiring, then the LED can be mounted and connected electrically, but the metal frames project outside the plastic cover and become light-blocking sections that restrict light distribution angle
Solution Approach 1:
The patent merges the light-reflecting function with the structural support function by making the substrate itself serve as the reflecting surface. The substrate is designed with a reflective inner surface that directs light downward, eliminating the need for separate metal frame structures that would block light. This integration resolves the contradiction by combining manufacturing simplicity with improved light distribution.
Solution Approach 2:
The patent introduces a reflective layer or coating on the substrate as an intermediary element that redirects light. This reflective intermediary allows the substrate to perform both structural and optical functions, preventing light blocking while maintaining ease of manufacture. The reflective surface acts as a mediator between the LED chips and the downward light direction.
2Illumination intensity
If the LED chip is positioned at the highest position on a projection part, then the light distribution angle is widened, but the configuration becomes complex with metal frames serving multiple functions
Solution Approach 1:
The patent combines the substrate, reflecting surface, and mounting structure into a single integrated component. Instead of separate metal frames and projection parts, the substrate itself is designed with an inclined or reflective surface that naturally directs light downward, simplifying the overall structure while maintaining wide light distribution.
Solution Approach 2:
The patent employs curved or inclined surfaces on the substrate to redirect light. The reflective surface is designed with specific angles or curvature that naturally guide light in the desired direction, achieving wide light distribution without complex geometric structures like multiple projection parts.
3Adaptability or versatility
If multiple light-emitting modules are provided on various points of a protrusion part and selectively turned on, then light distribution patterns can be switched, but luminous intensity in the base-side direction cannot be obtained
Solution Approach 1:
The patent segments the light-emitting elements into multiple LED chips arranged on the substrate, each capable of being controlled independently or collectively. This segmentation allows for flexible light distribution patterns while the reflective substrate ensures that light from all segments is directed downward, maintaining base-side luminous intensity.
Solution Approach 2:
The patent applies different control characteristics to different regions of the LED array. LEDs in different positions on the substrate can be activated selectively to create different lighting patterns, while the reflective surface ensures that regardless of which LEDs are active, the light is consistently directed downward with adequate intensity.
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 significantly improves the light distribution characteristics of LED illumination devices, achieving a wider light distribution angle comparable to incandescent lamps while maintaining a simple and efficient design.
Implementation Method 1
a first reflecting member in a truncated cone shape, which first reflecting member is provided in such a way that a side face of the first reflecting member makes an exterior acute angle with the first surface; and a plurality of first light-emitting elements provided, on the first surface, so as to surround the first reflecting member, at least the side face of the first reflecting member has a light reflecting function
Data Source
AI summary
An LED bulb (100) including a light source device (105) provided on a mounting plate (102) and covered by a globe (104) in a shape of a spherical shell is configured such that the light source device (105) includes: a reflecting member (108) in a truncated cone shape; and a plurality of LED chips (15) provided on a top surface of the substrate (11), at least a side face of the reflecting member (108) has a light reflecting function, and the light source device (105) is provided on the mounting plate (102) in such a way that a bottom surface of the substrate (11) faces the mounting plate (102).