Camera Barrel Assembly Geometry for Impact-Resistant Lens Coupling
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Solution Overview
Problem
The coupling force between barrels in a camera module of a wearable device, such as a head-mounted device (HMD), is compromised by external impacts, leading to separation of moving pins from cam paths, which affects the stability and functionality of the lens assembly.
Innovation Solution
A barrel assembly design featuring a first barrel with projections and a second barrel with guide grooves having an inner angle of 20° to 30°, along with varying arc lengths defined by parting lines, enhances the coupling force by ensuring precise alignment and stability during external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cam path extends with a wider angle, then the ease of operation for barrel movement is improved, but the coupling force between barrels deteriorates under external impact
Solution Approach 1:
The patent optimizes the cam path extension angle within a specific range (30° to 60°) to achieve the best balance between operational ease and coupling force. This parameter optimization ensures that the moving pin can smoothly traverse the cam path during barrel operation while maintaining sufficient coupling force to prevent separation under external impact.
Solution Approach 2:
The patent strengthens the coupling structure between barrels through optimized cam path design and moving pin configuration, providing preemptive reinforcement against external impacts. This beforehand cushioning approach ensures that the barrels remain coupled even when subjected to unexpected external forces during operation.
2Reliability
If the cam path extends with a narrower angle, then the coupling force between barrels is improved, but the ease of operation for barrel movement deteriorates
Solution Approach 1:
The patent determines the optimal cam path extension angle range (30° to 60°) through parameter analysis, finding the sweet spot where coupling force is sufficiently strong while operational ease is maintained. This parameter optimization resolves the trade-off by identifying the specific angular range that satisfies both requirements simultaneously.
3Ease of manufacture
If the barrels are designed with simple structure, then the ease of manufacture is improved, but the stability under external impact deteriorates
Solution Approach 1:
The patent applies local quality enhancement by concentrating structural reinforcement specifically in the coupling regions between barrels, particularly in the cam path and moving pin interface areas. This allows the barrels to maintain simple overall structure for ease of manufacture while having locally optimized features that provide enhanced stability under external impact.
Solution Approach 2:
The patent employs asymmetric design in the cam path geometry and moving pin configuration to optimize the coupling mechanism. The asymmetric features are strategically placed to maximize coupling force and stability under expected load conditions, while maintaining manufacturability through standard machining operations.
Data Source
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AI summary
An embodiment of the present disclosure relates to an electronic device and a method for preventing damage to a display caused by an external light source. The electronic device may comprise a barrel assembly for accommodating a lens group member configured to move a plurality of barrels in the optical axis direction by means of rotational motion. The barrel assembly may include a barrel positioned on the outer side when the plurality of barrels are inserted and coupled. A plurality of parting lines extending from a first open surface to a second open surface, provided on the respective sides of each barrel, may be included on the inner peripheral surface of each barrel. Various other embodiments are possible.