Optical Element Magnet Holder for Stable Scanning
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Solution Overview
Problem
In conventional optical scanners, the centrifugal force acting on a permanent magnet can exceed the adhesive force, leading to incomplete adhesion and unstable operation of the movable plate, affecting the scanning performance.
Innovation Solution
An optical element design featuring a plate with a reflecting surface, a shaft, a magnet, and a holder with a magnet accommodating portion that covers the magnet's lower surface, enhancing the magnetic field utilization and stability by fixing the magnet securely via the holder, which is made of magnetic material to act as a yoke, thereby increasing the swing angle and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the permanent magnet is fixed to the movable plate with adhesive, then the structure is simple, but the adhesion becomes incomplete due to centrifugal force exceeding adhesive force
Solution Approach 1:
The magnet fixing structure is segmented into multiple components: the movable plate, the holder with magnet accommodating portion, and the pressing portion. This segmentation allows each component to perform its specific function - the holder accommodates the magnet while the pressing portion applies radial pressure to secure it, solving the adhesion problem without requiring complex overall structure
Solution Approach 2:
The holder acts as an intermediary component between the movable plate and the permanent magnet. It provides a magnet accommodating portion that houses the magnet and a pressing portion that applies securing force, mediating the connection between the magnet and the rotating system without direct adhesive bonding to the movable plate
2Reliability
If the magnet is securely fixed with a holder, then the magnet adhesion stability is improved, but the device complexity increases
Solution Approach 1:
The holder is designed with multi-functionality: it provides magnetic shielding to concentrate magnetic flux, accommodates the magnet in a dedicated cavity, and applies radial pressing force through its pressing portion. This consolidation of multiple functions into a single component achieves reliable magnet fixation without proportionally increasing device complexity
Solution Approach 2:
The holder's pressing portion changes the physical state of constraint on the magnet by applying radial pressure. This parameter change (from no constraint to constrained position) secures the magnet against centrifugal force during rotation, achieving stability without complex mechanical structures
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 stabilizes the optical element's operation by ensuring secure magnet fixation, enhancing swing stability and increasing the swing angle while reducing power consumption, allowing for efficient scanning in multiple directions.
Implementation Method 1
a holder below the plate portion to hold the magnet. The holder includes a magnet accommodating portion in which the magnet is accommodated
Implementation Method 2
The drive unit has a permanent magnet fixed to a lower surface of the movable plate with an adhesive, and a coil. The drive unit rotates the movable plate about the predetermined axis by attracting the permanent magnet with a magnetic field generated by causing a current to flow through the coil
Data Source
AI summary
An optical element includes a plate portion including a reflecting surface on an upper surface in a direction of a vertically extending central axis, a shaft that extends in a direction of a first axis intersecting with the central axis and is fixed to a lower surface of the plate portion, a magnet below the shaft in the direction of the central axis, and a holder below the plate portion to hold the magnet, the holder including a magnet accommodating portion in which the magnet is accommodated, the magnet accommodating portion including a magnet pressing portion that covers at least a portion of a lower surface of the accommodated magnet.