Compact Lens Barrel Using Radial Guide Grooves
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Solution Overview
Problem
Existing lens barrels face challenges in achieving a compact design due to interference between support frame projections and flange portions, which limits their ability to minimize the combined length in the optical axis direction, hindering the development of more compact optical systems.
Innovation Solution
The proposed lens barrel design incorporates a drive frame, guide frame, and moving frame with specific cam mechanisms and accommodations that allow for a more compact configuration by optimizing the placement and interaction of cam followers, guide grooves, and flange structures, enabling a shorter combined length in the optical axis direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If translatory guide projections are provided on another support frame, then guidance function is improved, but the combined length of support frames in the optical axis direction increases due to interference with the flange portion
Solution Approach 1:
The guide groove is formed on the inner peripheral surface of the guide frame main body, utilizing the radial dimension instead of extending in the optical axis direction. This allows the guide protrusion to engage with the guide groove without increasing the combined length of support frames in the optical axis direction, while still providing effective guidance function.
Solution Approach 2:
The guide groove is nested within the guide frame main body structure, allowing the guide protrusion to fit into the groove without requiring additional space in the optical axis direction. This nested configuration enables the guidance function to be integrated within the existing structural boundaries.
2Length of moving object
If the combined length of support frames is reduced for compactness, then the lens barrel becomes more compact, but the guidance function and mechanical strength may be compromised
Solution Approach 1:
By forming the guide groove on the inner peripheral surface of the guide frame main body, the guidance function is achieved in the radial dimension rather than extending in the optical axis direction. This allows for a shorter combined length of support frames while maintaining effective guidance through the cam groove and guide groove interaction.
3Length of moving object
If the flange portion is positioned to avoid interference with guide projections, then the combined length is reduced, but the mechanical strength and stability may be affected
Solution Approach 1:
The guide groove is positioned on the inner peripheral surface of the guide frame main body, utilizing the radial dimension for guidance. This allows the flange portion to be positioned optimally for both mechanical strength and compactness, as the guidance function is achieved through the radial guide groove rather than requiring axial extension.
Data Source
AI summary
The lens barrel comprises a drive frame, a guide frame, and a moving frame. The moving frame includes a moving frame main body, a second cam mechanism portion, and a guide protrusion. The moving frame main body is configured to move between the drive frame and the guide frame. The second cam mechanism portion is configured to be accommodated in the first accommodation portion of the drive frame and engage to the first cam mechanism portion of the drive frame. The guide protrusion is configured to be accommodated in the second accommodation portion of the drive frame and engage to the guide groove of the guide frame.