Tapered Housing Cap for Compact Hermetic Multilaser Packaging
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Solution Overview
Problem
Existing multilaser arrangements for augmented and virtual reality devices face challenges in miniaturization, weight reduction, and optimization, particularly due to the need for hermetically sealed housings that accommodate blue laser diodes, which often result in bulky designs and limited installation space.
Innovation Solution
A multilaser arrangement with a housing cap featuring a side wall that tapers at the lower edge, integrated transparent elements, and a base plate with platformed lasers, allowing for compact design and efficient light emission, while using metal or ceramic materials for durability and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetically sealed housing is used to protect blue laser diodes, then reliability is improved, but volume increases
Solution Approach 1:
The patent implements nesting by placing the transparent element directly within the housing cap structure, eliminating the need for separate protective housings. The housing cap integrates both protective and optical functions, with the transparent element nested into the cap to allow laser light passage while maintaining hermetic sealing.
Solution Approach 2:
The patent merges the protective housing function with the optical element function by integrating the transparent element directly into the housing cap. This combination eliminates the need for separate protective structures and reduces overall housing volume while maintaining both protection and light transmission.
2Ease of manufacture
If the side wall has uniform thickness, then manufacturing is simplified, but lateral projection increases
Solution Approach 1:
The patent applies local quality by varying the side wall thickness along its length, with greater thickness at the top and reduced thickness at the lower edge. This localized thickness variation reduces lateral projection and allows for compact integration with the base plate while maintaining structural integrity where needed.
Solution Approach 2:
Instead of maintaining uniform thickness from top to bottom, the patent inverts the conventional approach by making the side wall thinner at the lower edge where it connects to the base plate. This inversion reduces lateral projection and enables more compact device integration.
3Volume of stationary object
If the transparent element is positioned at the lower edge, then installation space is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements preliminary action by providing a recess in the base plate at the lower edge where the transparent element is to be positioned. This pre-prepared recess guides the positioning and integration process, ensuring proper placement of the transparent element while optimizing installation space.
Solution Approach 2:
The recess in the base plate acts as an intermediary structure that facilitates the integration of the transparent element at the lower edge. This intermediate feature simplifies the positioning process and reduces manufacturing precision requirements by providing a predefined location for the transparent element.
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 enables a smaller, lightweight, and hermetically sealed multilaser arrangement that minimizes lateral projections, reduces weight, and optimizes installation space, ensuring reliable operation and efficient thermal management.
Implementation Method 1
a housing cap (3) fastened on the base plate (4), the housing cap (3) including at least one opening (13) with a transparent element (14) assigned to this opening (13) for the passage of electromagnetic radiation
Implementation Method 2
Three edge-emitting lasers (EELs) are often used in this case, one of the lasers emitting in the red wavelength range, one emitting in the green wavelength range and one emitting in the blue wavelength range
Implementation Method 3
a first laser (6) emitting in the red spectral range, a second laser (7) emitting in the green spectral range and a third laser (8) emitting in the blue spectral range
Implementation Method 4
The three lasers are enclosed with a view to reliable longevity, advantageously in a hermetically sealed housing, in particular for the exclusion of moisture
Data Source
AI summary
A multilaser arrangement includes: a housing including a base plate, a housing cap fastened on the base plate, and a transparent element, the base plate including a bottom face, the housing cap including an opening with the transparent element assigned to the opening for the passage of electromagnetic radiation; lasers, each being arranged inside the housing at a distance from the bottom face of the base plate, the housing cap including an upper wall and a side wall, which includes a lower edge and a surface, is formed integrally with the upper wall, and ends with the lower edge fastened on the base plate, the side wall having a first thickness and a second thickness, the first thickness being measured in a direction perpendicular to the surface, the second thickness being measured at the lower edge and being less than or equal to the first thickness.