Lens Barrel Cam Structure to Prevent Roller Plastic Deformation
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Solution Overview
Problem
Existing lens devices experience a decrease in optical performance due to plastic deformation of engaging members, such as cam rollers, when subjected to impacts, leading to reduced rotational and linear movement accuracy.
Innovation Solution
The lens device incorporates a design with a spiral cam groove and engaging members, such as cam rollers and straight rollers, with defined gaps and elastic materials, ensuring that the engaging members do not plastically deform beyond their elastic limits, maintaining optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If engaging members are made rigid to ensure precise movement, then movement accuracy is improved, but they become susceptible to plastic deformation under impact
Solution Approach 1:
The patent changes the material parameter of the engaging member from rigid to elastic, allowing it to deform within elastic limits under impact while maintaining precise movement during normal operation. The elastic modulus and yield strength are selected to balance movement accuracy and impact resistance.
Solution Approach 2:
The patent designs the engaging member with elastic properties that allow it to absorb impact energy through elastic deformation before plastic deformation occurs. This beforehand cushioning effect prevents permanent deformation while maintaining movement precision.
2Measurement precision
If the gap between facing portions is reduced to improve precision, then movement precision is improved, but the risk of plastic deformation increases under impact
Solution Approach 1:
The patent optimizes the gap dimension to a specific range that balances precision and impact protection. The gap is small enough to ensure movement precision but large enough to allow elastic deformation under impact, preventing plastic deformation.
Solution Approach 2:
The patent designs the gap as a cushioning space that absorbs impact energy, allowing the engaging member to deform elastically within the gap without causing plastic deformation, thereby protecting the precision mechanism.
3Reliability
If elastic materials are used to prevent plastic deformation, then reliability under impact is improved, but movement precision may deteriorate
Solution Approach 1:
The patent selects elastic materials with specific elastic modulus and yield strength values that ensure the material remains within elastic deformation limits during precise movement operations, while still providing sufficient cushioning under impact to prevent plastic deformation.
Solution Approach 2:
The patent applies elastic deformation partially - only enough to absorb impact energy within elastic limits during normal operation, while providing excessive cushioning capacity under extreme impact conditions to prevent plastic deformation.
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 maintains optical performance by preventing plastic deformation of engaging members, ensuring accurate rotational and linear movements, thus enhancing the overall functionality of the lens device.
Implementation Method 1
an elastic member that biases the extending lens barrel and the frame member to be spaced from each other in the optical axis direction
Data Source
AI summary
The lens device includes a rotating barrel that includes a spiral cam groove, a first lens frame that holds a first lens, a movable barrel that includes a first engaging member engaged with the cam groove and holds the first lens frame, and a stationary barrel that supports the movable barrel to be movable along a direction of an optical axis. The rotating barrel includes a first facing portion, and the movable barrel includes a second facing portion that faces the first facing portion with a first gap therebetween in the direction of the optical axis. The first engaging member includes a first elastic region, and the first gap is a gap corresponding to the first elastic region.