Inclined Deflector Axis for Two-Dimensional Scanning Projector Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Two-dimensional scanning projectors configured for shooting-up projection suffer from significant TV distortion and trapezoidal distortion, which existing solutions attempt to address through complex configurations and high-precision lens positioning.
Innovation Solution
A two-dimensional scanning projector design that inclines the rotation axis of a deflector within the scanning optical system, allowing the light beam to form specific angles with the optical axis, and satisfies conditions to minimize distortion, including the use of a relaying optical system and multiple light emitting units for simultaneous scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scanning optical system is decentered to correct TV distortion, then the TV distortion is reduced, but the device complexity increases and high-precision lens positioning is required
Solution Approach 1:
The patent changes the inclination angle parameter of the rotation axis relative to the optical axis to correct TV distortion. By optimizing this angular parameter, the patent achieves distortion correction without requiring complex decentered configurations or high-precision lens positioning, thus resolving the contradiction between manufacturing precision and device complexity
2Manufacturing precision
If the rotation axis is inclined to reduce TV distortion, then the image quality is improved, but the positioning precision requirement increases
Solution Approach 1:
The patent optimizes the inclination angle parameter of the rotation axis to achieve effective TV distortion correction while maintaining reasonable positioning tolerances. By carefully selecting this angular parameter, the patent improves image quality without excessively increasing positioning precision requirements
3Area of stationary object
If shooting-up projection is implemented to save space, then the device footprint is reduced, but TV distortion and trapezoidal distortion increase
Solution Approach 1:
The patent changes the angular parameter of the rotation axis inclination to compensate for the distortion introduced by shooting-up projection. This parameter optimization enables the system to maintain compact footprint while effectively correcting both TV distortion and trapezoidal distortion, thus resolving the contradiction between device area and image quality
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
Effectively suppresses TV distortion and trapezoidal distortion to levels comparable to non-shooting-up projection types, while simplifying the projector configuration and reducing the need for high-precision lens alignment.
Implementation Method 1
a first deflector which deflects the light beam in the first direction
Data Source
AI summary
A two-dimensional scanning projector causing a light beam to scan in a first direction and a second direction orthogonal to the first direction, comprising: a first deflector which deflects the light beam in the first direction; and a scanning optical system arranged between the first deflector and a scanned surface, wherein the first deflector is arranged such that a rotation axis of the first deflector is inclined, in a plane including an optical axis of the scanning optical system and the second direction, by a first angle with respect to the second direction, and the light beam is incident on the first deflector such that, in the plane including the optical axis and the second direction, a chief ray of the light beam entering a center of a projected image is obliquely incident on the first deflector to form a second angle with respect to the optical axis.