Composite Lens Barrel Structure for Roundness Under Thermal Expansion
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Solution Overview
Problem
Telephoto lenses with focal lengths of 300 mm or more are heavy due to their aluminum or magnesium alloy lens barrels, and existing manufacturing techniques struggle to achieve the necessary strength and light weight while maintaining complex shapes and accurate roundness.
Innovation Solution
A composite cylinder member is created by joining a first tubular component with projecting portions and a second tubular component, allowing for relative movement due to differing coefficients of linear expansion, and using a method that includes adhesive joining or thermal welding to enhance strength and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aluminum alloy or magnesium alloy lens barrels are used to achieve high strength, then strength is improved, but weight increases
Solution Approach 1:
The patent uses carbon-fiber reinforced resin (a composite material) to manufacture the lens barrel, combining carbon fibers with thermoplastic resin to achieve both high strength and light weight, resolving the contradiction between strength and weight
2Weight of moving object
If thermoplastic resin is used for the lens barrel to reduce weight, then weight is reduced, but strength decreases
Solution Approach 1:
The patent employs carbon-fiber reinforced resin, which combines thermoplastic resin with carbon fibers, maintaining the light weight advantage of thermoplastic resin while significantly enhancing strength through the reinforcing carbon fiber structure
3Ease of manufacture
If a single component structure is used for complex shapes, then manufacturing simplicity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent divides the lens barrel into multiple components (inner barrel and outer barrel) that are manufactured separately and then joined together, allowing each component to be precision-manufactured independently while maintaining the capability to produce complex overall shapes
4Shape
If multiple components are joined to achieve complex shapes, then shape complexity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple components (inner barrel and outer barrel) into a integrated joined structure through precise joining processes, achieving complex shapes while minimizing the increase in device complexity by streamlining the manufacturing and assembly processes
5Adaptability or versatility
If components with different coefficients of linear expansion are joined, then adaptability to temperature changes is improved, but deformation increases
Solution Approach 1:
The patent accounts for thermal expansion by selecting materials with appropriate coefficients of linear expansion and designing the joining structure to accommodate differential expansion, allowing the components to expand and contract together without causing excessive deformation or stress
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 achieves improved accuracy and reduced deformation of the tubular components, maintaining roundness and strength even under temperature changes, thus addressing the challenges of weight, strength, and manufacturing complexity in telephoto lenses.
Implementation Method 1
using a method that includes adhesive joining or thermal welding to enhance strength and accuracy
Implementation Method 2
using a method that includes adhesive joining or thermal welding to enhance strength and accuracy
Implementation Method 3
the second tubular component includes a tubular portion made of a material whose coefficient of linear expansion is higher than that of the first tubular component
Data Source
AI summary
A member includes a first tubular component including a tubular portion having a tubular shape, and a second tubular component including a tubular portion having a tubular shape and disposed coaxially with the first tubular component. The first tubular component includes a plurality of projecting portions configured to project from one end of the tubular portion of the first tubular component in an axial direction and spaced from each other in a circumferential direction. The first tubular component and the second tubular component are joined with each other such that each of the plurality of projecting portions is joined with the second tubular component. Each of the plurality of projecting portions includes a distal end portion joined with the second tubular component and a base portion separated from the second tubular component.