Magnet Structure with Movable Unit for Optical Disc Clamping
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Solution Overview
Problem
Existing optical disc apparatuses require complex assist circuits and increased motor power to detach the magnet structure from the turntable due to high magnetic attachment forces, making separation inefficient and power-intensive.
Innovation Solution
A magnet structure comprising a first and second magnet unit with alternating polarities, where the second magnet unit is supported by the first to move within a predetermined range, allowing for adjustable magnetic attachment force by alternating contact surfaces to facilitate easier separation without high torque assist circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic attachment force of the magnet structure is increased to hold the optical disc more reliably, then the disc can be fixed more securely for high-speed rotation, but greater force is required to separate the magnet structure from the turntable
Solution Approach 1:
The magnet structure is divided into a first magnet unit and a second magnet unit with opposite polarities. The second magnet unit can be selectively separated from the turntable first, reducing the total separation force needed while maintaining reliable disc fixation when both units are engaged
Solution Approach 2:
The second magnet unit is made movable relative to the first magnet unit, allowing it to be dynamically separated first during the detachment process. This dynamic separation reduces the peak force required compared to separating a single rigid magnet structure
2Speed
If a high magnetic attachment force is used to secure the optical disc, then high-speed rotation is enabled, but a complex assist circuit with high torque is required to detach the clamp
Solution Approach 1:
By segmenting the magnet structure into two independently controllable units, the separation process can be simplified to a two-stage operation without requiring complex high-torque assist circuits. The second unit separates first with lower force, then the first unit separates
Solution Approach 2:
The movable second magnet unit can be separated first using minimal external force, allowing the magnet structure to partially detach itself without requiring a complex assist circuit to overcome the full magnetic attachment force
3Force
If the magnetic attachment force is increased to enable high-speed rotation, then the holding force is sufficient, but the motor power capacity must be increased to provide the torque for separation
Solution Approach 1:
The magnet structure is segmented into two units that can be separated in sequence. The motor only needs to provide power for separating the second unit first with lower force, then the first unit, reducing the peak power capacity requirement compared to separating a single high-force magnet structure
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 reliable high magnetic attachment force for disc fixation and efficient separation with reduced power consumption by separating the second magnet unit first, allowing the entire structure to be detached with a smaller force than the attachment force, thus simplifying the clamping mechanism and reducing motor power requirements.
Implementation Method 1
When a magnet structure is magnetically attached to a magnetically-attached object with a non-magnetic body interposed therebetween, the non-magnetic body is fixed to the magnetically-attached object
Implementation Method 2
the second magnet unit is supported by the first magnet unit so as to move in a predetermined range
Data Source
AI summary
A magnet structure includes first and second magnet units. The first magnet unit is provided with a first magnet fixing section that includes a first surface and a first magnet having a first polarity on the first surface's side. The second magnet unit is provided with a second magnet fixing section that includes a second surface and a second magnet having a second polarity on the second surface's side, the second polarity being an opposite polarity to the first polarity. The first and second surfaces are located next to one another on the same plane to form a magnetic attachment surface which is magnetically attached to a magnetically-attached object. The second magnet unit is supported by the first magnet unit so as to move in a predetermined range.