Lens Barrel Assembly Geometry to Prevent Cam Pin Separation
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Solution Overview
Problem
The coupling force between barrels in a lens assembly 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 device.
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° and multiple parting lines, ensuring the barrels maintain a secure coupling through varied arc lengths and angles, enhancing support force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cam path extends at a wider angle, then the ease of operation is improved, but the coupling force between barrels deteriorates
Solution Approach 1:
The patent optimizes the cam path extension angle to a specific range (20° to 30°) to achieve the best balance between ease of operation and coupling force. This parameter optimization ensures that the moving pin can smoothly engage with the cam path while maintaining sufficient coupling strength to prevent barrel separation under external impact.
2Force
If the cam path extends at a narrower angle, then the coupling force between barrels is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent determines through optimization that a cam path extension angle of 20° to 30° provides the optimal balance, preventing barrel separation while ensuring smooth operation. This angle range is wide enough to allow easy engagement of the moving pin but narrow enough to maintain strong coupling force.
3Strength
If the guide groove inner angle is increased, then the support force is improved, but the manufacturing precision requirements worsen
Solution Approach 1:
The patent specifies the guide groove inner angle within the range of 20° to 30° to achieve optimal support force while maintaining reasonable manufacturing precision requirements. This angle range provides sufficient structural strength to prevent barrel separation without imposing excessively stringent manufacturing tolerances.
Data Source
AI summary
An electronic device and a method for preventing damage to a display caused by an external light source are provided. The electronic device includes a barrel assembly for receiving a lens group member that is configured to move in the optical axis direction by rotational operation of a plurality of barrels, wherein an outer barrel of the plurality of barrels positioned on an outside when the plurality of barrels are inserted and coupled includes guide grooves having an inner angle of 20° to 30° provided in an inner circumferential surface of the barrel, and eighteen or more parting lines extending from a first opening surface to a second opening surface provided on two opposite sides of the barrel are included in the inner circumferential surface of the barrel, wherein lengths of two adjacent first arcs among a plurality of first arcs obtained by dividing a first circumference at the first opening surface by the parting lines are different from each other, wherein lengths of two adjacent second arcs among a plurality of second arcs obtained by dividing a second circumference at the second opening surface by the parting lines are different from each other, and wherein a length of a first target arc obtained by dividing the first circumference by two adjacent parting lines among the parting lines is different from a length of a second target arc obtained by dividing the second circumference by the two adjacent parting lines.