Light-Emitting Package Sealing for Accurate Light Detection
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Solution Overview
Problem
In light-emitting devices, securing the sealing of light-emitting elements while ensuring appropriate light reception by a light-receiving element is challenging, affecting the stability of the device's operation.
Innovation Solution
A light-emitting device configuration featuring a base with distinct upper surfaces, where a first light-transmissive member seals the space containing the light-emitting elements and a second light-transmissive member supports the light-receiving element, allowing for hermetic sealing and efficient light detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealing structure is used for the light-emitting element, then the sealing is simplified, but the light-receiving element cannot be properly supported and positioned for accurate light detection
Solution Approach 1:
The patent divides the sealing structure into two separate members: a first light-transmissive sealing member that seals the light-emitting element, and a second light-transmissive sealing member that seals the light-receiving element. This segmentation allows each sealing member to be independently optimized for its specific function, ensuring both reliable sealing and accurate light detection positioning.
2Reliability
If the space is completely sealed to protect the light-emitting element, then stability is improved, but light reception by the light-receiving element becomes difficult
Solution Approach 1:
The patent applies local quality by making the sealing members light-transmissive in the regions where light detection is required. The first and second light-transmissive sealing members are positioned and configured to allow light to pass through to the light-receiving element while maintaining the sealed environment for operational stability.
3Measurement precision
If a photodiode is disposed at the upper portion for light reception, then light detection is enabled, but the sealing of the light-emitting element is compromised
Solution Approach 1:
The patent implements nesting by placing the light-receiving element within the sealed space formed by the first and second light-transmissive sealing members. The light-receiving element is positioned at a lower portion of the sealed space, allowing it to receive light from the light-emitting element through the light-transmissive sealing members without compromising the sealing integrity.
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
This configuration ensures stable operation by securely sealing the light-emitting elements and enabling effective light detection, reducing dust attraction and leakage, while allowing sufficient light to be emitted externally.
Implementation Method 1
a first light-transmissive member bonded to the first upper surface, sealing a space in which the light-emitting elements are mounted
Implementation Method 2
a light-receiving element configured to receive a portion of light emitted from the one or more light-emitting elements
Data Source
AI summary
A light-emitting device includes: a base including: a mount surface, and a lateral wall located around the mount surface, the lateral wall including: a pair of first protrusions located opposite to each other in a first direction which is parallel to a side of the mount surface, and a pair of second protrusions located opposite to each other in a second direction which is perpendicular to the first direction, the second protrusions being provided lower than the first protrusions; one or more light-emitting elements mounted on the mount surface of the base; a first light-transmissive member sealing a space in which the one or more light-emitting elements are mounted; and one or more wires connecting to the one or more light-emitting elements, the one or more wires being bonded on conduction regions provided on at least one of upper surfaces of the second protrusions.