Spherical Terminal Light Emitting Device with Exposure Surfaces
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Solution Overview
Problem
Existing light emitting devices face challenges in achieving a balance between small size, high mountability, and efficient light extraction, particularly in side-surface light emission types, where terminal design and light reflection are critical for reducing processing costs and maintaining connection strength with mounting substrates.
Innovation Solution
A light emitting device design featuring substantially spherical terminals and a light reflecting member with specific surface configurations, including terminal exposure surfaces, that allows for reduced processing costs and enhanced mountability while maintaining high connection strength and light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light emitting device is made compact with terminals covered by the light reflecting member, then the device size is reduced and mounting is simplified, but the terminal surface area for electrical connection is decreased
Solution Approach 1:
The patent extracts the terminals from the interior of the light reflecting member by forming exposure surfaces that partially remove the reflecting member material. This allows the spherical terminals to be partially exposed while maintaining the compact overall structure, resolving the contradiction between small device size and adequate terminal surface area for electrical connection.
Solution Approach 2:
The patent transitions from a fully enclosed terminal structure to a partially exposed structure by creating surface features (exposure surfaces) on the light reflecting member. This dimensional change allows terminals to be accessible for connection while maintaining the compact volumetric form factor of the overall device.
2Ease of manufacture
If bonding agent is used to connect the light emitting device to the substrate, then mounting is simplified, but the bonding agent absorbs light and reduces light extraction efficiency
Solution Approach 1:
The patent extracts the terminals from the interior of the light reflecting member by forming exposure surfaces that partially remove the reflecting member material. This allows the spherical terminals to be partially exposed while maintaining the compact overall structure, resolving the contradiction between small device size and adequate terminal surface area for electrical connection.
Solution Approach 2:
The patent transitions from a fully enclosed terminal structure to a partially exposed structure by creating surface features (exposure surfaces) on the light reflecting member. This dimensional change allows terminals to be accessible for connection while maintaining the compact volumetric form factor of the overall device.
3Reliability
If the terminals are exposed from the light reflecting member, then electrical connection is improved, but the device structure becomes more complex
Solution Approach 1:
The light reflecting member serves multiple functions: it reflects light, provides structural support, and through the formation of exposure surfaces, enables terminal access. This multi-functionality reduces the need for additional components that would otherwise be required to expose terminals, thereby limiting the increase in structural complexity while improving electrical connection reliability.
Solution Approach 2:
Instead of completely removing the light reflecting member to expose terminals, the patent applies partial action by forming exposure surfaces that selectively expose the terminals while retaining the majority of the reflecting member structure. This maintains structural integrity and minimizes complexity increase while achieving reliable electrical connections.
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 enables a compact, high-mountability light emitting device with improved light extraction and reduced absorption of light by bonding agents, achieving stable mounting and efficient light emission.
Implementation Method 1
a light reflecting member holding the light emitting element, the first terminal, and the second terminal
Data Source
AI summary
A light emitting device includes a light emitting element, a first terminal, a second terminal, and a light reflecting member. The first terminal and the second terminal each have a substantially spherical shape and are electrically connected to the light emitting element. The light reflecting member holds the light emitting element, the first terminal, and the second terminal. The light reflecting member includes a bottom surface, an upper surface, a first side surface, a second side surface, a front surface, a back surface, a first terminal exposure surface, and a second terminal exposure surface. The light emitting device is to be placed via the bottom surface. The first terminal is exposed from the first terminal exposure surface to provide a first exposed portion. The second terminal is exposed from the second terminal exposure surface to provide a second exposed portion.