Optical Driving Apparatus Lens Holder Tilt Control
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Solution Overview
Problem
Conventional optical driving apparatuses face challenges in controlling the positioning and suppressing tilt of a lens holder in directions orthogonal to the optical axis due to the use of a single rolling member, which leads to instability and difficulty in precise alignment.
Innovation Solution
An optical driving apparatus is designed with a holder featuring first and second contact portions spaced along the optical axis, guided by a guide member, and biased by a magnetic force generated by a biasing member, ensuring precise positioning and tilt suppression through a combination of rolling members and stopper portions that maintain contact with guide members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rolling member is used to contact the guide bar, then the device complexity is reduced, but the positioning precision and tilt control in directions orthogonal to the optical axis deteriorate
Solution Approach 1:
The single rolling member is segmented into multiple rolling members (first rolling member and second rolling member) that are spaced apart in the optical axis direction. Each rolling member contacts the guide bar at a different position, collectively providing stable positioning and tilt control while maintaining relatively simple device structure
Solution Approach 2:
The rolling members are arranged in the optical axis direction (adding a dimensional aspect), creating a distributed contact configuration that suppresses tilt around the optical axis while maintaining low friction movement
2Force
If magnetic force is used to press the rolling member against the guide bar, then the friction is reduced compared to mechanical pressing, but the positioning stability deteriorates due to tilt around the rolling member axis
Solution Approach 1:
The single magnetic pressing point is segmented into multiple magnetic pressing points (first and second rolling members at different positions). This distribution prevents the holder from tilting around any single rolling member axis, maintaining stability while preserving the low friction advantage of magnetic force
Solution Approach 2:
The rolling members are positioned at different locations in the optical axis direction, creating a spatial distribution that provides rotational stability while maintaining the magnetic force advantage of low friction contact
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 apparatus achieves stable and precise movement of the lens holder in the optical axis direction with low friction, preventing tilting and ensuring accurate positioning, even under external forces or changes in orientation.
Implementation Method 1
a biasing member configured to generate a biasing force serving as a magnetic force configured to bias the holder so that the first contact portion and the second contact portion are pressed against the guide member
Data Source
AI summary
An optical driving apparatus includes a holder configured to hold an optical element and including a first contact portion and a second contact portion that are spaced from each other in an optical axis direction, a guide member configured to contact the first contact portion and the second contact portion and to guide the holder in the optical axis direction, and a biasing member configured to generate a biasing force serving as a magnetic force configured to bias the holder so that the first contact portion and the second contact portion are pressed against the guide member. The biasing member is disposed between the first contact portion and the second contact portion in the optical axis direction.