Inclined Reflecting Member for LED Mounting and Light Extraction
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Solution Overview
Problem
The existing light emitting devices face challenges in mounting blue LED chips due to space limitations and inefficient light emission and color reproduction caused by narrow cavities, leading to decreased productivity and light efficiency.
Innovation Solution
A light emitting device with a substrate, lead frames, a mold member, and a reflecting member inclined towards an opening portion, allowing easy mounting of LED chips and effective light guidance, which enhances the yield rate and prevents heat-induced degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a narrow cavity reflecting cup is used, then the device structure is compact, but the LED chip mounting becomes difficult and productivity decreases
Solution Approach 1:
The patent transitions from a traditional narrow cavity reflecting cup structure to a planar substrate with lead frames configuration. By changing the spatial arrangement from a vertical cavity to a horizontal planar layout, the LED chip mounting area is expanded without increasing the overall device height, thereby improving mounting productivity while maintaining compactness.
2Volume of moving object
If a narrow cavity reflecting cup is used, then the device structure is compact, but the mold part insertion becomes difficult and defect rate increases
Solution Approach 1:
The patent replaces the narrow vertical cavity with a planar substrate structure that provides adequate space for mold part insertion and positioning. This dimensional change eliminates the insertion difficulties associated with narrow cavities, reducing defects and improving reliability.
3Volume of moving object
If a narrow cavity reflecting cup is used, then the device structure is compact, but the color reproduction and light efficiency are degraded
Solution Approach 1:
The patent transitions from a confined narrow cavity to an open planar substrate structure with optimized light paths. This allows for better light extraction and reduced total internal reflection, improving light efficiency and color reproduction while maintaining a compact overall device footprint through vertical integration.
4Volume of moving object
If a narrow cavity reflecting cup is used, then the device structure is compact, but the heat dissipation becomes insufficient
Solution Approach 1:
The patent adopts a planar substrate configuration with extended lead frames that provide larger surface area for heat dissipation. This dimensional change from a compact vertical cavity to a spread-out horizontal structure enables more effective thermal management while maintaining overall device compactness through optimized layering.
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 inclined reflecting member facilitates easier LED mounting and molding, improving the yield rate and light efficiency by directing and reflecting light effectively, while also aiding in heat dissipation.
Implementation Method 1
The mold part 40 includes a yellow fluorescent substance such as YAG:Ce fluorescent substance. The yellow fluorescent substance absorbs blue light emitted from a blue LED chip 30 and is excited by means of the blue light, so that yellow light can be emitted. The yellow light is mixed with the blue light so that white light is emitted.
Implementation Method 2
forming a reflecting member, which is inclined toward an opening portion formed at one side thereof, around the mold member
Data Source
AI summary
Disclosed are a light emitting device and a method for manufacturing the same. The light emitting device includes a substrate having a lead frame, a light emitting diode mounted on the substrate, a mold member formed on the substrate and the light emitting diode, and a reflecting member having an opening portion at one side thereof and being inclined at an outer portion of the mold member.