Rotating Reflection Body Inclination Angle for Scanning Beam Distortion
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Solution Overview
Problem
Existing light scanning apparatuses using rotating multifaceted mirrors with inclined reflecting surfaces suffer from vertical distortion in the scanning area, limiting the flexibility of the scanning path and scan angle, especially when the rotation axis is at a 0° inclination angle.
Innovation Solution
A light scanning apparatus with a rotating reflection body having an inclination angle φ different from 0°, allowing the scanning beam to be incident at a specific angle θ, which enables more flexible setting of the scanning path and reduces distortion by predetermining the inclination angle according to the incident angle, allowing for full scan angles of 360°/N and 180° or greater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rotation axis of the rotating reflection body is set at an inclination angle φ of 0°, then the structure is simple and easy to manufacture, but the scanning path flexibility is limited and vertical distortion occurs in the measurement area
Solution Approach 1:
The patent changes the inclination angle parameter φ of the rotation axis from the conventional 0° to a non-zero value. This parameter change enables the scanning beam to trace a desired scanning path more accurately and reduces vertical distortion in the measurement area, while still maintaining a relatively simple structural configuration.
2Device complexity
If the rotation axis inclination angle φ is set to 0°, then the device complexity is reduced, but the scanning beam deviation from the specific scanning direction increases
Solution Approach 1:
By setting the inclination angle φ to a non-zero value, the patent improves the scanning beam accuracy and reduces deviation from the specific scanning direction. The patent determines this inclination angle based on the incident angle θ of the laser beam, optimizing the scanning precision while maintaining reasonable device complexity.
3Adaptability or versatility
If the rotation axis inclination angle φ is set to a non-zero value, then the scanning path flexibility and beam accuracy are improved, but the device complexity increases
Solution Approach 1:
The patent implements a controlled parameter change by setting the inclination angle φ to a non-zero value that is determined based on the incident angle θ. This approach achieves improved scanning path flexibility and beam accuracy while limiting the increase in device complexity to only the necessary angular adjustment, without requiring complex additional mechanisms.
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
This configuration allows for a more flexible scanning path trace, reduces distortion, and enhances light reception sensitivity, enabling the scanning beam to closely approximate the desired scanning path and achieve fixed elevation or bearing angles, improving the scanning performance compared to systems with a 0° inclination angle.
Implementation Method 1
a rotating reflection body that rotates about a rotation axis inclined at an inclination angle φ to the reference direction and includes at least one reflecting surface that is disposed in a direction intersecting obliquely with the rotation axis and reflects light from the light source incident on the reflecting surface at an incident angle θ
Data Source
AI summary
A light scanning apparatus including a light source for emitting light in a direction different from a direction orthogonal to the reference direction, and a rotating reflection body that rotates about an axis inclined at an inclination angle φ to the reference direction and includes at least one reflecting surface that is disposed in a direction intersecting obliquely with the axis and reflects light incident on the reflecting surface at an incident angle θ. A specific scanning direction is a direction intersecting at an angle to the reference direction and the rotation axis inclination angle φ≠0°. The inclination angle φ is predetermined according to the incident angle θ such that deviation of the scanning beam reflected by the reflecting surface is smaller than the deviation of the scanning beam that would be obtained with the inclination angle φ of the rotation axis 0°.