Light Deflection Apparatus with Magnetic Suspension
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Solution Overview
Problem
Conventional light deflection apparatuses with dynamic pressure bearings are vulnerable to external shocks and forces, leading to instability and potential detachment of the rotor section due to gravity and misalignment during assembly.
Innovation Solution
The design incorporates a stator section with asymmetric dynamic pressure generating grooves and a closed dynamic pressure bearing section, where the rotor section takes an upper position, using a closed member to maintain an airtight end portion, and the stator coil and magnet are arranged in parallel to balance forces, ensuring stability against external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotor section is caused to float by magnetic suction force with an open dynamic pressure bearing section, then the rotor section can rotate at high speed, but the rotation mechanism becomes vulnerable to external shocks and forces causing detachment
Solution Approach 1:
The patent replaces the conventional open mechanical bearing system with a magnetic bearing system that uses magnetic suction force to suspend the rotor section, eliminating mechanical contact and enabling high-speed rotation without wear. The magnetic field-based support mechanism substitutes traditional mechanical friction-based bearings.
Solution Approach 2:
The patent applies different bearing types at different locations: magnetic bearings are used specifically at the thrust direction ends to handle axial loads and prevent detachment, while dynamic pressure bearings are used at radial positions for rotational support. This localized application of different bearing qualities optimizes both speed and reliability.
2Ease of manufacture
If the rotor section is positioned lower during assembly, then assembly may be easier, but gravity causes the rotor section to detach from the dynamic pressure bearing
Solution Approach 1:
The patent uses magnetic suction force as an anti-gravity mechanism that generates upward magnetic attraction to counterbalance the downward gravitational force on the rotor section. This magnetic counterweight effect prevents detachment regardless of the rotor's position during assembly or operation.
Solution Approach 2:
The magnetic bearing system is designed to generate magnetic suction force before gravitational detachment can occur, creating a preliminary restraining force that prevents the rotor section from detaching even when positioned in vulnerable locations during assembly or operation.
3Temperature
If ventilation holes are provided on the cover body for air circulation, then cooling is improved, but the rotation mechanism becomes more susceptible to external influences
Solution Approach 1:
The patent uses a flexible or selective barrier approach where the cover body can be designed with controlled permeability or selective opening mechanisms that allow thermal exchange while restricting mechanical shock transmission. The thin film or shell structure provides thermal management while maintaining mechanical isolation.
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 enhances the stability of the rotor section during high-speed rotation, preventing detachment even under external shocks and forces by maintaining a balanced force equilibrium, thus improving the robustness of the dynamic pressure bearing mechanism.
Implementation Method 1
an air gap with a thickness of several μm is formed by air pressure between a pressure surface of the rotor section and a pressure surface of the dynamic pressure bearing which face each other, and by the rotation of the rotor section and by actions of a dynamic pressure generating groove provided on the dynamic pressure bearing, to reduce resistance between the dynamic pressure bearing and the rotor section
Implementation Method 2
the rotor section having the polygon mirror is caused to float by magnetic suction force by a permanent magnet provided on the radial bearing and by a magnetic body provided on the rotor section
Data Source
AI summary
A light deflection apparatus, including a stator section including a radial bearing having a first dynamic pressure generating groove, a thrust bearing having a second dynamic pressure generating groove, and a stator coil; and, a rotor section including a polygon minor, a magnet facing the stator coil, and a rotating body having a dynamic pressure surface facing the radial bearing and a dynamic pressure surface facing the thrust bearing, the rotor supporting the polygon minor and the magnet; wherein one end portion of the dynamic pressure bearing section included of the thrust bearing, the radial bearing and of the rotating body in the thrust direction is closed excluding a gap between the dynamic pressure bearing section of the radial bearing and the dynamic pressure bearing section of the rotating body.