Laser Light-Emitting Package Cap Layout for Stray Light Blocking
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Solution Overview
Problem
Existing light emitting devices face issues with stray light extraction and lack of space for information printing, making them less compact and inefficient.
Innovation Solution
A light emitting device design featuring a cap with a light-transmissive member and a light blocking film on its lower surface, positioned to reduce stray light and create a mark formation region, allowing for a more compact device with improved light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cover glass is entirely light-transmissive, then light transmission is improved, but stray light extraction increases
Solution Approach 1:
The light blocking film is applied selectively to specific regions of the cap's lower surface, creating local variations in light transmission properties. The film covers areas where stray light would be generated while leaving openings in regions where light transmission is needed, thus resolving the contradiction between overall light transmission and stray light reduction.
2Device complexity
If the device structure is simplified without dedicated mark printing area, then device complexity is reduced, but information printing capability is lost
Solution Approach 1:
The light blocking film serves multiple functions: it blocks stray light, defines the laser beam path, and provides a surface for printing information such as lot numbers. By making the film multi-functional, the patent eliminates the need for separate dedicated mark printing areas while maintaining information printing capability.
3Object-generated harmful factors
If stray light reduction measures are added, then light management is improved, but device compactness may be compromised
Solution Approach 1:
The light blocking function is extracted from the bulk structure and implemented as a thin film layer on the cap surface. This approach provides effective stray light reduction while adding minimal volume to the device, thus maintaining compactness.
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 solution effectively reduces stray light and enables the inclusion of a mark formation region, resulting in a more compact and efficient light emitting device.
Implementation Method 1
a light blocking film arranged on the lower surface of the light-transmissive member and having a shape which has at least one opening
Data Source
AI summary
A light emitting device includes a package, a cap fixed to the package, and at least one laser element. The cap includes a light-transmissive member having a lower surface facing the package and an upper surface opposite to the lower surface, and a light blocking film arranged on the lower surface of the light-transmissive member and having a shape which has at least one opening. The at least one laser element is disposed in a space bounded by the cap and the package at a position such that the at least one opening is irradiated by laser light emitted from the at least one laser element, at least a part of each of the at least one laser element being disposed in the at least one opening in the light blocking film in a top view.