Side-View LED Package Terminal Relocation for Light Output
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Solution Overview
Problem
Side-view type light emitting devices experience a reduction in light quantity and strength due to the method of fixing terminals, which reduces the surface area of the light emission face and allows flux to penetrate into the resin, compromising the strength of the molded article.
Innovation Solution
A side-view type light emitting device design with two terminals exposed at the rear, bottom, and side faces, featuring concavities for solder, and a base part that enhances stability and heat dissipation, without exposing terminals on the front or top face, thereby maintaining a larger light emission surface area and reducing flux penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four terminals are exposed at the four corners of the light emitting device to be fixed via solder to the mounting board, then the light emitting device can be securely fixed, but the surface area of the front face opening is reduced, causing a decrease in the amount of light emitted
Solution Approach 1:
The patent divides the terminal exposure locations into two groups: two terminals are positioned at the bottom face corners for secure soldering fixation, while the other two terminals are positioned at the side face corners away from the front face. This segmentation allows the front face opening to maintain its full surface area for light emission while still providing four terminals for secure mounting board attachment.
2Reliability
If four terminals are exposed at the four corners for soldering fixation, then the light emitting device can be securely fixed, but the molded article strength is decreased due to flux penetration into the resin
Solution Approach 1:
The patent extracts two terminals from the front face area and positions them at the side face corners instead. This removes the source of flux penetration damage from the front face region, protecting the molded article strength while maintaining four-terminal soldering fixation for secure mounting.
3Reliability
If two terminals are provided at the two corners on the front face side, then the light emitting device can be fixed, but the surface area of the front face opening is reduced, causing a decrease in light emission quantity
Solution Approach 1:
The patent moves two terminals from the front face (two-dimensional plane) to the side face (different spatial dimension/orientation). This dimensional relocation allows the front face opening to maintain its full surface area for maximum light emission while the side face provides additional terminal positions for secure fixation.
Data Source
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AI summary
A light emitting device (100) comprises a substantially cuboid package (20) and a light emitting element (10) that is installed in the package (20). The package (20) is made up of a molded article (30) and a first lead (40) and second lead (50) that are each embedded in the molded article (30). The first lead (40) has a first terminal component (42) that is exposed from the molded article (30) at the boundary between a first side face (20E1) of the package array (20), a bottom face (20A), and a rear face (20D) that is contiguous with the bottom face (20A) and is opposite a light emission face (20C). The second lead (50) has a second terminal component (52) that is exposed from the molded article (30) at the boundary between a second side face (20E2) that is opposite the first side face (20E1), the bottom face (20A), and the rear face (20D). The first terminal component (42) has a first terminal concavity (42S) whose opening is contiguous with the first side face (20E1), the bottom face (20A), and the rear face (20D). The second terminal component (52) has a second terminal concavity (52S) whose opening is contiguous with the second side face (20E2), the bottom face (20A), and the rear face (20D).