Inclined Cap Structure for Compact Light Emitting Packages
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Solution Overview
Problem
Existing light emitting devices are not compact enough due to inefficient design and manufacturing methods.
Innovation Solution
A light emitting device is designed with a cap that has inclined lateral surfaces to optimize light transmission and a manufacturing method involving a light-transmissive base member with convex portions to create recesses, allowing for stable and compact cap production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing inner lateral surface is inclined, then the light emitting device becomes more compact, but the manufacturing complexity increases
Solution Approach 1:
The cap is divided into multiple lateral portions (first lateral portion, second lateral portion, etc.), each with different inclination angles. This segmentation allows each portion to be optimized independently for compactness while maintaining manufacturing feasibility through standardized production processes.
Solution Approach 2:
Different lateral portions of the cap have different inclination angles tailored to their specific functions and positions. The first lateral portion has a first inclination angle, while the second lateral portion has a second inclination angle, allowing local optimization of light transmission and device compactness without requiring complex overall restructuring.
2Illumination intensity
If multiple lateral portions with different inclination angles are used, then light transmission is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies concrete parameter ranges for inclination angles (first inclination angle and second inclination angle with different values) to optimize light transmission. By defining specific parameter ranges rather than requiring exact precise values, the design balances optical performance with manufacturing capabilities.
Solution Approach 2:
The cap structure is designed with predetermined inclination angles during the manufacturing process. The base member is formed with convex portions that create recesses with specific inclination angles, allowing the optical optimization to be built-in during manufacturing rather than requiring post-manufacturing adjustment.
3Reliability
If the cap surrounds the light emitting element completely, then sealing capability is improved, but device size increases
Solution Approach 1:
The cap utilizes curved or inclined lateral surfaces rather than flat perpendicular walls. The inclined lateral portions allow the cap to taper toward the light emitting element, providing effective sealing coverage while minimizing the overall volume occupied by the cap structure.
Solution Approach 2:
The cap design transitions from a simple cylindrical shape to a multi-faceted structure with inclined lateral portions. This dimensional change in the cap geometry allows it to provide comprehensive sealing around the light emitting element while reducing the horizontal footprint and overall device size.
Data Source
AI summary
A light emitting device includes a light emitting element, a substrate, and a cap. The cap surrounds the light emitting element disposed on the substrate, and has a plurality of lateral portions including a first lateral portion having a first inner lateral surface through which the light emitted from a light emitting surface and traveling along an optical axis passes, and a second lateral portion having a second inner lateral surface different from the first inner lateral surface. The first inner lateral surface is inclined at a first inclination angle toward a side where the light emitting element is disposed with respect to a plane perpendicular to the mounting surface. The second inner lateral surface is inclined at a second inclination angle larger than the first inclination angle toward a side where the light emitting element is disposed with respect to a plane perpendicular to the mounting surface.