Lateral Light-Receiving Package Layout for Secure Wavelength Conversion
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Solution Overview
Problem
Existing light emitting devices with laser diodes and wavelength converters require complex substrate shapes, leading to manufacturing accuracy issues and safety concerns due to the need for precise fitting recesses.
Innovation Solution
A light emitting device design featuring a package with a base member, frame member, and cover, where the light emitting element and light receiving body are positioned within a sealed space, with the light receiving body having a longer length than the distance between the frame member's inner lateral surfaces, restricting its movement and enhancing safety by preventing direct emission of light outside the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fitting recess conforming to the shape of the wavelength converter is formed in the substrate, then the wavelength converter can be securely fixed, but the substrate shape becomes complicated and manufacturing accuracy requirements increase
Solution Approach 1:
The invention divides the fixing structure into two parts: a simple recess formed in the substrate and protrusions formed on the wavelength converter. This segmentation allows the substrate to maintain a simple shape while the wavelength converter carries the structural complexity through its protrusions, thereby securing reliable fixing without complicating the substrate shape
Solution Approach 2:
Instead of forming a complex recess in the substrate to match the wavelength converter shape, the invention inverts the approach by forming simple recesses in the substrate and corresponding protrusions on the wavelength converter. This inversion transfers the shape complexity from the substrate to the wavelength converter, simplifying substrate manufacturing while maintaining secure fixing
2Reliability
If a fitting recess conforming to the shape of the wavelength converter is formed in the substrate, then the wavelength converter can be securely fixed, but manufacturing accuracy requirements increase
Solution Approach 1:
The fixing structure is segmented into simple substrate recesses and protrusions on the wavelength converter. This segmentation allows each component to be manufactured with lower precision requirements individually, while the combined structure achieves reliable fixing, thereby reducing overall manufacturing accuracy requirements
3Object-affected harmful factors
If the light receiving body is positioned within a sealed space with restricted movement, then safety is enhanced by preventing direct light emission outside, but the device structure becomes more complex
Solution Approach 1:
The invention merges the light receiving body with the package structure by positioning it within the sealed space formed by the substrate, side wall, and cover. This merging integrates the safety function into the existing package structure rather than adding separate safety components, thereby enhancing safety while minimizing increases in device complexity
Solution Approach 2:
The sealed space formed by the substrate, side wall, and cover serves multiple functions: it provides structural support for the LED, creates a mounting surface for the wavelength converter, and simultaneously acts as a safety mechanism by restricting light emission. This multi-functionality enhances safety without requiring additional dedicated safety components
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 design simplifies the substrate shape, improves manufacturing accuracy, and enhances safety by ensuring the light receiving body remains in position to receive light from the emitting element, reducing the likelihood of direct light emission outside the device.
Implementation Method 1
The light emitting element is configured to emit directional light traveling in a lateral direction
Implementation Method 2
causes light emitted from the laser diode to enter a wavelength converter, converts the light entering the wavelength converter into light having a different wavelength
Data Source
AI summary
A light emitting device includes a package including a base member, a frame member having a plurality of inner lateral surfaces, and a cover, a light emitting element surrounded by the frame member and disposed on an upper surface of the base member, the light emitting element configured to emit directional light traveling in a lateral direction, and a light receiving body surrounded by the frame member and disposed on the upper surface of the base member in the lateral direction of the light emitting element to receive the light. The light receiving body has a first lateral surface facing the light emitting element and a second lateral surface opposite to the first lateral surface. The second lateral surface of the light receiving body faces a first opposing surface arranged adjacent to the second lateral surface with a space between the second lateral surface and the first opposing surface.