Lens Barrel Biasing Structure for Backlash-Free Alignment
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Solution Overview
Problem
Existing lens barrels face challenges in maintaining precise alignment and reducing backlash between guide bars and lens holding frames, leading to potential misalignment and increased mechanical load on drive motors.
Innovation Solution
A lens barrel design incorporating a biasing mechanism with compression springs and bearings that press lens holding frames against guide bars, reducing backlash and stabilizing lens positions, while utilizing a unique shape for the ninth lens group to minimize barrel size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lens holding frame is guided by a guide bar without additional biasing mechanisms, then the structure is simpler, but backlash and misalignment occur between the guide bar and lens holding frame
Solution Approach 1:
A contact member is introduced as an intermediary component between the lens holding frame and the guide bar. This contact member transmits guiding forces while eliminating backlash through elastic deformation, achieving precise alignment without directly modifying the guide bar or lens holding frame structures.
Solution Approach 2:
The physical state of the contact member is changed by applying elastic deformation through compression springs. This parameter change allows the contact member to adaptively maintain contact with the guide bar, eliminating backlash while keeping the overall structure relatively simple.
2Reliability
If compression springs are used to press the lens holding frame against the guide bar, then backlash is reduced and alignment is improved, but the device complexity increases due to additional biasing mechanisms
Solution Approach 1:
The contact member serves as a mediator that absorbs the complexity of the biasing mechanism. By concentrating the elastic deformation function in this single component, the design achieves reliable alignment stability without distributing complexity across multiple modified components.
Solution Approach 2:
The compression springs automatically maintain constant contact between the contact member and the guide bar through elastic force. This self-regulating mechanism ensures alignment stability without requiring external control systems or complex actuation mechanisms.
3Force
If conventional guide mechanisms are used without contact members, then the device is more compact, but mechanical load on drive motors increases due to friction and backlash
Solution Approach 1:
The direct mechanical contact between rigid guide bar and lens holding frame is replaced with elastic contact through the contact member. This substitution reduces friction and mechanical load by allowing elastic deformation instead of rigid sliding contact, while the added complexity is minimal.
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 design achieves stable lens alignment, reduces mechanical load on drive motors, and minimizes barrel size and weight, enhancing optical performance and operational efficiency.
Implementation Method 1
a biasing member that is in contact with the first lens holding frame and biases the contact member toward the first guide bar
Data Source
AI summary
A lens barrel having good optical performance, the lens barrel includes a first lens holding frame that holds a first lens, a first guide bar that guides the first lens holding frame in an optical axis direction, a contact member that is in contact with the first guide bar, and a biasing member that is in contact with the first lens holding frame and biases the contact member toward the first guide bar.