Laser Diode Vertical Spacing for Prism Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image projection apparatuses face image quality deterioration due to aberrations caused by decentered beams on the screen, resulting from misalignment of optical axes between light sources and micro display devices, leading to blurred images.
Innovation Solution
An image projection apparatus is designed with laser diodes emitting beams of different wavelengths, a scanning mirror, and a prism that decenters beams based on wavelengths, with laser diodes vertically spaced to correct aberrations and maximize beam incidence on the micro display device surface, using a collimating lens to adjust focus and a base member with mounting holes for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the positions and angles of light sources and collimating lens are adjusted to correspond optical axes with micro display device, then optical alignment is improved, but beams become decentered on screen due to prism aberrations
Solution Approach 1:
The patent applies local quality by fixing laser diodes at different vertical heights corresponding to different wavelengths. Each wavelength component (red, green, blue) is emitted from a specific height position, allowing the prism to disperse them to the same focal point on the screen. This localized positioning compensates for chromatic aberration caused by the prism, resolving the beam decentering issue while maintaining optical axis alignment.
2Manufacturing precision
If laser diodes are vertically spaced apart corresponding to wavelengths, then aberrations are corrected and beam decentering is minimized, but device structure becomes more complex
Solution Approach 1:
The patent uses a single prism component to achieve multiple functions: it disperses different wavelengths from vertically spaced laser diodes to converge at the same focal point, corrects chromatic aberration, and maintains beam alignment without requiring additional optical elements. This multi-functionality reduces overall system complexity despite the vertically spaced laser diode configuration.
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 corrects aberrations on the screen, minimizes beam decentering, and enhances image quality by optimizing the alignment of beams, improving optical efficiency and image brightness.
Implementation Method 1
a prism disposed at the rear of the scanning mirror to decenter the beams via the scanning mirror based on the wavelengths
Implementation Method 2
a collimating lens disposed at the front of the light source to convert the beams of the light source into parallel beams
Data Source
AI summary
An image projection image for projecting an image on a screen includes a light source, a scanning mirror and a prism. The light source includes laser diodes for emitting beams of different wavelengths. The scanning mirror reflects the beams radiated from the light source and projects the reflected beams. The prism is disposed at the rear of the scanning mirror to decenter the beams via the scanning mirror based on the wavelengths. In the image projection apparatus, the laser diodes are fixed to be vertically spaced apart from a reference height, corresponding to the wavelengths of the beams.