Lens Barrel Guide Bar Positioning for Compact High-Precision Imaging
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Solution Overview
Problem
Existing lens barrel designs face challenges in achieving high-precision lens holding while minimizing size, as traditional positioning structures lead to increased size and relative positional deviations between lenses.
Innovation Solution
The lens barrel incorporates a first and second lens frame, with a first guide bar supporting the first lens frame for movement along the optical axis. The lens frames feature specific hole portions that engage with the guide bar, allowing for precise perpendicular positioning and reducing the radial size of the lens barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a positioning boss is provided in the housing to position the fixed lens frame, then the fixed lens frame can be positioned, but the overall size of the lens barrel becomes larger
Solution Approach 1:
The patent merges the positioning function into the guide bar structure itself. The guide bar has a positioning portion that engages with a positioning groove on the lens frame, eliminating the need for a separate positioning boss in the housing. This integration achieves both compact size and precise positioning by combining multiple functions into a single structural element.
Solution Approach 2:
The patent extracts the positioning function from the housing structure and relocates it to the guide bar. Instead of providing a positioning boss in the housing, the guide bar itself is designed with a positioning portion that directly engages with the lens frame, removing the need for additional housing features and reducing overall size.
2Measurement precision
If the fixed lens frame is positioned by a positioning boss in the housing, then positioning is achieved, but a relative positional deviation occurs between the centers of the fixed lens and zoom lens
Solution Approach 1:
The patent merges the positioning reference into a single common guide bar structure. Both the fixed lens frame and zoom lens frame engage with the same guide bar, which serves as a unified reference. This ensures that both lenses are positioned relative to the same reference line, eliminating relative positional deviation between their centers.
Solution Approach 2:
The guide bar serves multiple functions: it guides the movement of the zoom lens frame, positions the fixed lens frame, and provides a common reference for center alignment. By making the guide bar a universal reference structure for both lens frames, the patent ensures consistent center alignment without requiring separate positioning mechanisms.
3Ease of manufacture
If different positioning structures are used for the fixed lens frame and zoom lens frame, then each can be positioned independently, but a relative positional deviation is likely to occur between the centers of the two lenses
Solution Approach 1:
The patent merges the positioning reference system into a single common guide bar that serves both lens frames. While each lens frame has its own engagement features with the guide bar, they both reference the same guide bar structure, ensuring consistent center alignment. This approach maintains independent positioning capability while eliminating relative positional deviation.
Data Source
AI summary
A lens barrel capable of high-precision lens holding while achieving miniaturization, the lens barrel including a first lens and a second lens, a first lens frame that holds the first lens and a second lens frame that holds the second lens, and a first guide bar that supports the first lens frame so that it is movable in an optical axis direction, in which the first lens frame includes a sleeve portion including a first hole portion and a second hole portion that are engaged with the first guide bar and an opening portion formed between the first hole portion and the second hole portion, the second lens frame is provided with a third hole portion that engages with the first guide bar, and when the first guide bar is engaged with the first hole portion and the second hole portion of the first lens frame and the third hole portion of the second lens frame, the first lens frame and the second lens frame are positioned in a direction perpendicular to the optical axis by the first guide bar, and the third hole portion of the second lens frame is disposed within the opening of the sleeve portion.