Optical Scanner Movable Plate X-Y Axis Rotation Control
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Solution Overview
Problem
Existing optical scanners, such as those described in JP-A-2005-181395, face challenges in stabilizing the movement of a movable plate about both the X and Y axes due to differing mechanisms and magnetic field interference, making independent and stable rotation of the plate impossible.
Innovation Solution
An optical scanner design featuring a movable plate supported by a frame with four link sections positioned at 90-degree intervals, each with a drive section and shaft sections that can bend and deform to allow independent rotation about both X and Y axes, utilizing a SOI substrate and electromagnetic displacement units for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic fields are used to turn the movable plate about X and Y axes, then the plate can be rotated, but the magnetic fields from different coils interfere with each other making independent rotation impossible
Solution Approach 1:
The patent introduces a magnetic shielding plate as an intermediary element positioned between the coils and the movable plate. This shielding plate selectively blocks magnetic field lines from reaching certain areas, preventing interference between the X-axis and Y-axis coils while still allowing each coil to effectively rotate the plate about its respective axis. The shielding plate acts as a mediator that separates the magnetic field paths of the two orthogonal rotation mechanisms.
2Adaptability or versatility
If different mechanisms are used for X-axis and Y-axis rotation, then each axis can be controlled separately, but the rotation conditions differ making stable simultaneous rotation impossible
Solution Approach 1:
The patent employs identical coil structures and identical magnetic circuit configurations for both X-axis and Y-axis rotation mechanisms. Each axis has its own coil and magnetic circuit that are structurally homogeneous with the other. This homogeneity ensures that both axes operate under the same conditions, enabling stable and predictable simultaneous rotation about both axes without the instability caused by mismatched mechanisms.
3Force
If coils are placed close to the movable plate for efficient actuation, then rotation force is improved, but magnetic field interference between coils increases
Solution Approach 1:
The magnetic shielding plate serves as an intermediary that allows the coils to be positioned close to the movable plate for efficient actuation while preventing magnetic field interference. The shielding plate is strategically positioned to block cross-axis magnetic field lines from reaching the movable plate, thereby maintaining strong rotation force from each coil without the harmful interference that would otherwise occur at close 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
Enables stable and independent rotation of the movable plate about two perpendicular axes, improving the scanner's ability to smoothly turn and vibrate, thus enhancing its performance and stability in optical scanning applications.
Implementation Method 1
The shaft section of each link section is bent and deformed in a thickness direction of the movable plate by turning the drive section
Implementation Method 2
a movable plate including a light reflecting section having light reflectivity
Data Source
AI summary
An optical scanner includes: a light reflecting section having light reflectivity; a movable plate which includes the light reflecting section and can be displaced; four link sections connected to the movable plate; and a supporting section supporting the four link sections. The four link sections are provided on an outer circumference of the movable plate at 90-degree intervals along a circumferential direction of the movable plate in a plan view. Each link section includes a turnable drive section, and a shaft section which connects the movable plate and the drive section. The shaft section is bent and deformed in a thickness direction of the movable plate by turning the drive section.