Light Scanner With Orthogonal Rotation Axes and Bending Parts
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Solution Overview
Problem
Existing light scanners with electromagnetic actuators face difficulties in stably and freely rotating the total reflection mirror due to complex control requirements and magnetic field interference between torsion bars, making precise direction control challenging.
Innovation Solution
A light scanner design featuring a movable part with orthogonal rotation axes, driven by separate drive units with magnetic fields, where the movable beams and bending parts allow independent displacement along different axes, preventing interference and enabling flexible and stable rotation of the light reflection surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electromagnetic actuators with multiple planar coils and torsion bars are used to enable multi-axis rotation, then the light scanner can control reflection direction in multiple directions, but the magnetic fields from different coils interfere with each other causing unstable and imprecise rotation control
Solution Approach 1:
The patent divides the rotation control into two independent segments: the displacement part controls rotation around the first rotation center axis via movable beams, while the movable part controls rotation around the second rotation center axis via bending parts. This segmentation isolates the magnetic field generation and rotation control for each axis, preventing magnetic field interference between axes and ensuring stable, independent rotation control for each degree of freedom.
2Ease of operation
If multiple planar coils are provided on both the outer movable plate and inner movable plate to enable independent rotation control, then the light scanner can achieve complex rotation patterns, but the magnetic fields generated interfere with each other making precise control difficult
Solution Approach 1:
The patent extracts the magnetic field generation function from the rotation control mechanism. The displacement part and movable part are designed so that their respective magnetic fields are generated at different locations and orientations, with the displacement part's coils positioned to affect only the first axis rotation and the movable part's coils positioned to affect only the second axis rotation. This extraction and spatial separation eliminates magnetic field interference while maintaining independent control capability.
3Measurement precision
If the first torsion bar rotates to control light reflection direction, then the light scanner can change reflection angle, but the extension orientation of the second torsion bar center axis rotates and moves making control complex
Solution Approach 1:
The patent segments the control mechanisms so that the displacement part handles only the first rotation center axis control with fixed geometric relationships, while the movable part handles only the second rotation center axis control. This segmentation prevents the geometric complexity that would arise from coupled torsion bar rotations, as each part's geometry remains fixed relative to its rotation axis, simplifying the control mechanism while maintaining precise light reflection direction control.
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 design allows for reliable and independent displacement of the movable part along multiple axes, enabling precise control of the light reflection direction without interference between drive units, resulting in a more stable and freely rotating light scanner with a smaller form factor.
Implementation Method 1
the movable beam has a bending part that bendingly deforms in a thickness direction of the support frame due to displacement of the displacement part
Implementation Method 2
an electromagnetic actuator having a function as a light scanner has been known. The electromagnetic actuator includes an insulating substrate on which a pair of permanent magnets are provided and a scanner main body located between the pair of permanent magnets
Data Source
AI summary
A light scanner includes a light reflection part having light reflectivity, a movable part having the light reflection part and being rotatable around a first rotation center axis and a second rotation center axis, a pair of movable beams extending from the movable part, a displacement part connected to the movable beams and rotating the movable part around the first rotation center axis, a first drive part that drives the displacement part, a pair of drive beams extending from the displacement part in parallel to the light reflection surface and orthogonal to an extension direction of the movable beams, a support frame that supports the drive beams, and a second drive part that rotates the movable part around the second rotation center axis, and the movable beam has a bending part that bendingly deforms due to displacement of the displacement part.