Lens Barrel Nested Frame Gap Design
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Solution Overview
Problem
Conventional lens barrels composed of multiple cylindrical parts face limitations due to their outside diameter, necessitating complex configurations or larger inside diameters, which increase the number of parts required.
Innovation Solution
The lens barrel design incorporates a substantially cylindrical first frame with a protrusion on its outer surface and a second frame with a smaller inside diameter, forming a gap between their diameters to reduce the number of parts needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple cylindrical parts are combined to form a lens barrel, then the lens barrel can be assembled with standard components, but the number of parts increases and the outside diameter is constrained
Solution Approach 1:
The patent merges the first frame and second frame into a single integrated frame structure. The first frame's outer peripheral surface directly engages with the second frame's inner peripheral surface through protrusions and grooves, eliminating the need for separate cylindrical components and reducing assembly complexity while maintaining manufacturing ease.
Solution Approach 2:
The patent implements a nested configuration where the first frame is positioned inside the second frame, with the first frame's outer diameter fitting within the second frame's inner diameter. This nested arrangement allows multiple functional elements to be housed within a compact structure, reducing the overall number of parts needed.
2Ease of operation
If the inside diameter of cylindrical parts is made slightly larger than the outside diameter of incorporated parts, then assembly is facilitated, but the number of parts must be increased
Solution Approach 1:
The patent applies local quality by creating a specific engagement zone on the first frame's outer peripheral surface with protrusions that fit into corresponding grooves on the second frame. This localized engagement feature provides precise assembly guidance and facilitation without requiring the entire cylindrical surface to have increased clearance, thereby avoiding the need for additional parts.
Data Source
AI summary
A lens barrel 10 comprises a substantially cylindrical first lens group unit 11 that holds a lens L1, and a substantially cylindrical front frame unit 12 that is disposed in a state of being close to the outer peripheral surface side of the substantially cylindrical first lens group unit 11. The first lens group unit 11 has a rectilinear key 11c that protrudes outward in the radial direction on the outer peripheral surface of the lens L1 on the image plane side in the optical axis direction. The front frame unit 12 has an inside diameter that is smaller than the outside diameter of the first lens group unit 11 in the portion where the rectilinear key 11c is provided. The first lens group unit 11 and the front frame unit 12 are formed so that a gap is formed between the outside diameter of the first lens group unit 11 and the inside diameter of the front frame unit 12 at a position opposite the rectilinear key 11c in the radial direction.