Laser Projector Scanning Mirror Diverging Angle Adjustment
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Solution Overview
Problem
Laser projectors face issues with irregular brightness and resolution of projected images due to varying distances between the projector and the screen, as parallel laser beams result in either large display size with spacing or small display size with overlapping beams, leading to image blurriness.
Innovation Solution
A laser projector with a scanning mirror and an enlarging optical unit that adjusts the diverging angle of the laser light flux based on the swing angle of the scanning mirror, using equations to determine optimal diverging angles for horizontal and vertical directions, ensuring clear image projection regardless of distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If parallel laser beams are used for projection, then the beam diameter remains constant regardless of projection distance, but this causes irregular brightness and resolution issues when projection distance varies
Solution Approach 1:
The patent changes the optical parameter of the laser beam from parallel (zero divergence) to divergent by introducing a diverging optical element. The diverging angle is specifically designed to match the scanning mirror's swing angle, ensuring that the beam diameter expands proportionally with projection distance, thereby maintaining consistent image quality across varying distances.
Solution Approach 2:
The patent creates a dynamic relationship between beam divergence and projection distance. By designing the beam to diverge at a specific angle corresponding to the scanning mirror's swing angle, the system adapts the beam characteristics to match the projection geometry, ensuring optimal image quality at any distance.
2Area of stationary object
If the projection distance is increased to achieve larger display size, then the display area increases, but the beams become spaced causing irregular brightness
Solution Approach 1:
The patent modifies the beam divergence parameter to ensure that as projection distance increases, the beam diameter expands proportionally. This prevents beam spacing and maintains continuous coverage across the display area, ensuring uniform brightness even at larger projection distances.
3Area of stationary object
If the projection distance is decreased to achieve smaller display size, then the display area decreases, but the beams overlap causing resolution loss
Solution Approach 1:
The patent optimizes the beam diverging angle to match the scanning mirror's swing angle. This ensures that at any projection distance, the beam width appropriately covers the intended display area without overlap, thereby maintaining image resolution even at shorter projection distances.
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 maintains clear image quality by adjusting the beam diameter and display area according to the distance, preventing both blurriness from spacing and overlap, thus ensuring consistent image clarity across varying distances.
Implementation Method 1
a scanning mirror scanning the laser light emitted from the laser light source
Implementation Method 2
an enlarging optical unit enlarging a light flux of the laser light emitted from the laser light source to have a diverging angle corresponding to a swing angle of the scanning mirror
Data Source
AI summary
An enlarging optical unit receives laser light emitted from a laser light source, enlarges a light flux of the received laser light to have a diverging angle corresponding to a swing angle of a scanning mirror and provides it to the scanning mirror.