Prism Optical Path Separation for Compact Laser Projection
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Solution Overview
Problem
Existing optical systems face challenges in reducing size while maintaining efficiency due to air gaps between mirrors, which can lead to laser light loss from scratches or dust in prisms.
Innovation Solution
Incorporating a prism with internal intermediate imaging positions for light fluxes in orthogonal directions, utilizing reflecting surfaces with different curvatures and eccentricity to separate optical paths, and employing scanning elements to adjust magnification and reduce the influence of scratches or dust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a prism is used to fill the space between mirrors to downsize the optical system, then the optical system size is reduced, but laser light loss occurs due to scratches or dust in the prism at the imaging point
Solution Approach 1:
The patent applies dimensionality change by separating the intermediate imaging positions in different directions. The first intermediate imaging position in the first direction is located inside the prism, while the second intermediate imaging position in the orthogonal second direction is positioned differently (either outside the prism or at a different location). This spatial separation in multiple dimensions allows the optical system to maintain compact size while avoiding concentration of optical paths at a single vulnerable point, thereby reducing the impact of scratches or dust on laser light transmission efficiency
2Reliability
If mirrors are used with air gaps to maintain optical path separation, then scratch influence is minimized, but the optical system size increases
Solution Approach 1:
The patent merges the functions of multiple optical elements into a single integrated prism. Instead of using separate mirrors with air gaps, the invention combines reflection and imaging functions within one prism structure. The prism includes both a first reflecting surface and a second reflecting surface, along with incident and exit surfaces, creating a compact integrated optical element that achieves both size reduction and reliable optical path separation through its internal geometry
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 optical system is downsized by utilizing a prism to shorten the optical path and minimize light loss from scratches or dust, while maintaining efficient image projection with adjustable magnification and resolution.
Implementation Method 1
A first intermediate imaging position of a light flux in a first direction is located inside the prism
Implementation Method 2
prism having an incident surface, an exit surface, and one or more reflecting surfaces
Data Source
AI summary
The present disclosure provides an optical system that includes a prism having an incident surface, an exit surface, and one or more reflecting surfaces. A first intermediate imaging position of a light flux in a first direction is located inside the prism. The first intermediate imaging position is different from a second intermediate imaging position of the light flux in a second direction orthogonal to the first direction.