Coil Support Through Hole for Optical Device Driving Precision
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Solution Overview
Problem
Existing optical devices used in image display apparatuses face challenges in achieving high driving precision due to the configuration of the driving unit, which can lead to inaccurate shifting of the optical axis and deterioration of display characteristics.
Innovation Solution
The optical device incorporates a coil with a conductive wire wound around it, where one end of the wire is drawn through a through hole or concave portion in the coil support unit, preventing the coil from inclining and coming into contact with a permanent magnet, thus maintaining a stable gap and efficient magnetic field application for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conductive wire is drawn to the outside of the coil between the coil support unit and the coil, then the coil may be inclined toward the coil support unit, but the gap between the coil and permanent magnet decreases causing contact risk
Solution Approach 1:
The patent introduces a through hole in the coil support unit as an intermediary structure. The conductive wire passes through this through hole rather than being drawn between the coil and coil support unit. This intermediary structure prevents the wire from causing coil inclination while still allowing the wire to be drawn to the outside, thus preventing coil contact with the permanent magnet.
2Reliability
If the gap between the coil and permanent magnet is increased to avoid contact, then coil contact is prevented, but the magnetic field application efficiency deteriorates
Solution Approach 1:
The through hole in the coil support unit serves as an intermediary that allows the conductive wire to pass through without interfering with the coil's position. This enables the coil to maintain an optimal gap with the permanent magnet for efficient magnetic field application, while still preventing coil contact through the structural guidance provided by the through hole.
Solution Approach 2:
The patent optimizes the gap parameter between the coil and permanent magnet by preventing coil inclination through the through hole structure. This allows the gap to be maintained at an optimal value that balances contact prevention with magnetic field application efficiency, rather than requiring an excessively large gap.
3Device complexity
If the coil is inclined toward the permanent magnet, then the gap decreases in certain location, but driving precision deteriorates due to contact risk
Solution Approach 1:
The through hole in the coil support unit acts as an intermediary structure that guides the conductive wire, preventing it from pushing the coil toward the permanent magnet. This maintains the coil's proper orientation and positioning, ensuring high driving precision without requiring complex additional constraint mechanisms.
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 driving precision and efficiency, preventing coil contact with the permanent magnet while allowing for effective shifting of the optical axis, thereby improving display characteristics and resolution.
Implementation Method 1
a coil that generates a magnetic field to be applied to the permanent magnet
Data Source
AI summary
An optical device includes a movable unit that supports a glass plate, axis portions that swingably support the movable unit around a swing axis, a support unit that supports the axis portions and, a permanent magnet that is provided in the movable unit, and a coil that is disposed to face the permanent magnet, and a coil support unit that is supported by the support unit and supports the coil. A conductive wire is wound around the coil and a drawn wire is drawn from the side of the inner circumference of the coil. The coil support unit includes a through hole overlapping the inner circumference of the coil and the drawn wire is inserted through the through hole.