Stacked Laser Assembly With Spacers for Compact Beam Alignment
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Solution Overview
Problem
Conventional manufacturing techniques for laser diode arrangements in virtual and augmented reality applications are complex and expensive, requiring large optics to align different colors, which is undesirable for compact devices.
Innovation Solution
Stacking laser devices with spacers to create a space-saving and easily processable arrangement, allowing for electrical contacting and varying resonator lengths, with spacers made from dielectric materials or laser devices themselves serving as spacers, enabling precise positioning and flexible mounting on carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional manufacturing techniques are used to arrange laser diodes on a circuit board, then the laser arrangement can be produced, but the manufacturing process becomes complex and expensive
Solution Approach 1:
The patent transitions from planar arrangement of laser diodes on a circuit board to a three-dimensional stacked configuration. Multiple laser devices are arranged vertically along a common optical axis, with each laser device mounted on a separate carrier at different heights. This dimensional change simplifies the manufacturing process by eliminating the need for complex precision alignment of multiple laser diodes on a single plane, while reducing overall device complexity.
2Manufacturing precision
If conventional optics are used to align different laser colors on the user's lens, then proper alignment is achieved, but the optics become larger which is undesirable for compact applications
Solution Approach 1:
The patent eliminates the need for large conventional alignment optics by arranging multiple laser devices vertically along a common optical axis in three-dimensional space. Each laser device is positioned at a different height on separate carriers, allowing direct collimated beam emission toward the user's lens without requiring additional optical elements for alignment. This vertical stacking approach achieves precise alignment while minimizing the overall volume of the optical system.
Solution Approach 2:
The patent removes the intermediate alignment optics from the conventional laser arrangement system. Instead of using separate optical elements to align multiple laser diodes on a circuit board, the invention directly positions the laser devices in three-dimensional space along a common optical axis, extracting the alignment function from the optical path and integrating it into the mechanical positioning of the stacked laser devices themselves.
3Ease of manufacture
If laser diodes are arranged on a circuit board, then the arrangement can be manufactured, but the overall dimensions become larger which is not suitable for small applications like spectacles
Solution Approach 1:
The patent reduces the overall footprint and thickness of the laser arrangement by transitioning from a planar circuit board layout to a three-dimensional stacked configuration. Multiple laser devices are mounted vertically on separate carriers at different heights, allowing the system to fit within a compact volume suitable for applications like spectacles. The vertical arrangement minimizes the horizontal footprint while maintaining manufacturability through standardized mounting procedures.
Data Source
AI summary
The invention relates to a stacked laser arrangement, including a first laser device having a light exit side and a semiconductor body which forms a resonator and has an active zone and two main sides and side faces arranged substantially perpendicular thereto; wherein the laser device has at least one contact region on a first of the two main sides. Moreover, a first spacer having a first contact main side and a contact side face is provided, with the contact main side having at least one contact line which leads from a contact region to a connection area on or adjacent to the contact side face. With its first main side facing the first contact main side, the first laser device is fastened to the first spacer such that the at least one contact region is electrically connected to the contact region of the first contact main side, and the side faces of the first laser device are spaced apart from the contact side face.