Lens Guide Device with Rolling Bodies and Biasing Mechanism
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Solution Overview
Problem
Existing lens moving devices face issues with lens frame inclination during movement and stop, leading to position shifts in the optical axis, increased sliding resistance, and difficulty in maintaining compact device size, especially when imaging directions change.
Innovation Solution
A lens guide device with a dual guide unit system using rolling bodies and a biasing mechanism to maintain lens frame alignment and position accuracy, eliminating inclination and allowing smooth movement without rattling, utilizing a combination of guide members and rolling bodies to guide the lens frame in the optical axis direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is formed between the guide hole and the guide member to enable smooth movement, then the lens frame can move smoothly, but the lens frame becomes inclined during movement and stop, causing position shifts in the optical axis direction
Solution Approach 1:
A biasing mechanism (coil spring) is introduced as an intermediary element between the lens frame and the guide members. The spring applies a biasing force to maintain continuous contact between the lens frame and the guide members, eliminating the inclination caused by gaps while still allowing smooth movement. This mediator resolves the contradiction by providing both stability and movement capability.
2Stability of the object's composition
If a coil spring is used to bias the lens frame toward one guide member to eliminate rattling, then the lens frame is guided without inclination, but the sliding resistance during movement increases
Solution Approach 1:
The contact interface is changed from sliding to rolling by introducing rolling bodies (balls or rollers). This parameter change in the motion mode reduces the resistance force significantly, as rolling friction is much smaller than sliding friction. The biasing mechanism maintains contact stability while the rolling motion eliminates excessive sliding resistance.
3Stability of the object's composition
If balls are disposed on both sides of the optical axis to guide the lens frame using rolling motion, then the inclination is removed, but the device size increases
Solution Approach 1:
The rolling bodies are positioned asymmetrically - one rolling body is placed on the optical axis side while the other is positioned off the optical axis. This asymmetric arrangement achieves stable guidance and inclination elimination without requiring symmetric placement on both sides, thereby reducing the overall device volume while maintaining guidance stability.
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 solution effectively removes lens frame inclination and ensures accurate positioning even when imaging directions change, reducing movement resistance and maintaining a compact device size by using a dual guide unit system with rolling bodies and a biasing mechanism.
Implementation Method 1
The first rolling body is moved while being in contact with the first guide member. The second rolling body is moved while being in contact with the second guide member.
Implementation Method 2
The biasing mechanism biases one of the first and second rolling bodies toward the other of the first and second rolling bodies.
Data Source
AI summary
A first rail 41 supports a first rolling body 45 so as to allow the first rolling body 45 to be rollable in a first direction parallel to an optical axis of a first focus lens. A second rail 42 supports a second rolling body 46 so as to allow the second rolling body 46 to be rollable in the first direction. The biasing mechanism 47 supports the first rolling body 45 so as to allow the first rolling body 45 to be movable in the first direction, and biases the first rolling body 45 toward the first rail 41. A third rail 43 is provided in parallel with the second rail 42. The third rail 43 supports a second rolling body 46 so as to allow the second rolling body 46 to be movable in the first direction.