Lens Unit Guide Component Sandwiching for Optical Axis Alignment
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Solution Overview
Problem
Lens units with screw mechanisms for adjusting optical axis positions suffer from accuracy issues due to thread gaps, leading to reduced precision in optical system alignment.
Innovation Solution
A lens unit design featuring a guide component sandwiched between two portions of a lens holder, allowing for precise movement along the optical axis through elastic force, simplifying the configuration and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a screw mechanism is used to adjust lens position, then the lens position can be adjusted, but thread gaps cause optical axis shifts and reduce adjustment accuracy
Solution Approach 1:
The patent extracts and eliminates the screw mechanism entirely, replacing it with a guide component system. By removing the problematic threaded structure, the source of thread gaps and optical axis shifts is eliminated, while lens position adjustment is achieved through rotation of the lens holder against guide faces.
Solution Approach 2:
The patent replaces the mechanical screw threading system with a guide face and follower system. Instead of using threaded engagement, the lens holder rotates against inclined guide faces, converting the adjustment mechanism from a threaded mechanical system to a cam-like mechanical system that avoids gap-related precision issues.
2Ease of operation
If a screw mechanism is used for lens adjustment, then position adjustment is possible, but the configuration becomes complex
Solution Approach 1:
The patent removes the complex threaded structure and replaces it with simpler guide faces and a follower mechanism. This extraction of the problematic screw mechanism reduces the overall complexity of the adjustment system while maintaining the essential function of lens position control.
3Device complexity
If the lens holder structure is simplified, then configuration is easier, but stability and precision of positioning may be compromised
Solution Approach 1:
The lens holder is divided into distinct functional portions: a rotationally driven portion for adjustment and a guided portion for stable positioning. The guide component is also segmented into multiple guide faces. This segmentation allows each part to perform its specific function optimally while maintaining overall structural simplicity and stability.
Solution Approach 2:
The guide component acts as an intermediary between the lens holder and the lens frame. It provides stable positioning through guided movement while allowing rotational adjustment, mediating between the need for simple configuration and the requirement for position 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
This design improves the accuracy of optical system adjustments while maintaining a simplified configuration, reducing looseness and enhancing the precision of lens holder positioning.
Implementation Method 1
The guide component is sandwiched between the first portion and the second portion by an elastic force of the first portion and/or the second portion
Data Source
AI summary
A lens unit has an optical system having at least one lens, a lens holder supporting the optical system and a lens frame having a guide component. The guide component guides a movement of the lens holder in a first direction. The lens holder has a first portion and a second portion. The first portion is disposed slidably over the guide component. The second portion is disposed slidably over the guide component and disposed spaced apart from the first portion in the first direction. The guide component is sandwiched between the first portion and the second portion by an elastic force of the first portion and/or the second portion.