Compact Scanning Laser Projection Module for VR/AR
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Solution Overview
Problem
The integration of a projection module into VR/AR smart glasses is challenging due to the need for a compact, space-saving design that allows for easy and precise positioning and alignment with other optical components, while ensuring wear comfort and safety, especially for mobile use.
Innovation Solution
A compact scanning laser projection module with a mounting support that separates the laser module and micromirror array, utilizing a beam-deflection system to direct the laser beam between them, allowing for selective heat dissipation and easy integration with optical elements for beam combining and alignment, and featuring an external mechanical interface for precise alignment and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the projection module is designed to be compact and space-saving, then the device size is reduced, but the positioning and alignment precision becomes more difficult to achieve
Solution Approach 1:
The projection module is divided into separate functional components (laser module, micromirror array, beam-deflection system) that can be independently positioned and aligned on the mounting support, allowing precise adjustment without requiring the entire module to be large
Solution Approach 2:
The mounting support acts as an intermediary structure with defined mounting surfaces and mechanical interfaces that facilitate precise positioning and alignment of the laser module and micromirror array relative to each other, enabling accurate optical alignment in a compact configuration
2Volume of moving object
If the laser module and micromirror array are positioned close together for compactness, then the device volume is reduced, but heat dissipation becomes more difficult
Solution Approach 1:
The mounting support provides different functional characteristics at different locations: mounting surfaces for precise positioning, heat dissipation structures for thermal management, and mechanical interfaces for alignment. This allows simultaneous achievement of compact size and effective heat dissipation through localized functional optimization
3Ease of manufacture
If the projection module is designed for easy integration with optical components, then the ease of manufacture is improved, but the device complexity increases
Solution Approach 1:
The mounting support serves multiple functions simultaneously: it provides mechanical mounting for the laser module and micromirror array, establishes precise alignment through defined surfaces and interfaces, enables heat dissipation, and facilitates easy integration with external optical components. This multi-functionality reduces overall system complexity despite the varied requirements
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 compact, easy-to-integrate projection module with improved heat dissipation and precise alignment, enhancing wear comfort and safety in VR/AR smart glasses, while maintaining a compact design suitable for various applications.
Implementation Method 1
a beam-deflection system (28). The beam-deflection system (28) is configured in such a way that the at least one laser beam (9) is directed from the laser module (22) on the front side of the support onto the micromirror array (26) on the rear side of the support
Data Source
AI summary
A scanning laser projection module which is suitable for consumer applications because of its very compact design. The projection module includes an actuable laser module having at least one laser source for emitting a laser beam of a predefinable intensity, an actuable micromirror array for deflecting the at least one laser beam, a mounting support having a support front side and a support rear side and a beam-deflection system. The laser module is situated on the support front side, and the micromirror array is situated on the support rear side. The beam-deflection system is configured in such a way that the at least one laser beam is steered from the laser module on the support front side onto the micromirror array on the support rear side.