Lens Barrel Compactness via Segmented Coupling
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Solution Overview
Problem
Existing lens barrels with bayonet coupling mechanisms can hinder the relative movement of frames in the optical axis direction, leading to insufficient movement distance and increased bulkiness, making them less compact.
Innovation Solution
A lens barrel design incorporating a moving frame, a drive frame with a cam mechanism, and a rectilinear guide frame, where the drive frame includes a rotary guide portion to support the rectilinear guide frame for rotation without optical axis movement, creating a holding space for part of the moving frame, allowing for reduced length in the optical axis direction when the frames are at their shortest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bayonet coupling is used to link two frames, then the frames can be connected securely, but the bayonet-coupled portion hinders the movement of the frames in the optical axis direction, resulting in insufficient movement distance and increased bulkiness
Solution Approach 1:
The coupling mechanism is divided into two independent functional portions: a bayonet coupling portion for secure rotational connection and a linear coupling portion for maintaining axial movement. This segmentation allows each portion to perform its specific function without interfering with the other, resolving the contradiction between secure connection and movement distance.
Solution Approach 2:
The coupling mechanism transitions from a single-dimensional bayonet coupling to a two-dimensional coupling system that includes both rotational (bayonet) and linear (axial) components. This dimensional expansion allows the frames to achieve both secure connection and sufficient movement distance by operating in different spatial dimensions.
2Reliability
If bayonet coupling is used to link two frames, then the frames can be connected securely, but the bayonet-coupled portion hinders the movement of the frames, making the lens barrel bulkier
Solution Approach 1:
The coupling mechanism is divided into two independent functional portions: a bayonet coupling portion for secure rotational connection and a linear coupling portion for maintaining axial movement. This segmentation allows each portion to perform its specific function without interfering with the other, resolving the contradiction between secure connection and movement distance.
Solution Approach 2:
The coupling mechanism transitions from a single-dimensional bayonet coupling to a two-dimensional coupling system that includes both rotational (bayonet) and linear (axial) components. This dimensional expansion allows the frames to achieve both secure connection and sufficient movement distance by operating in different spatial dimensions.
3Volume of moving object
If the moving frame is guided in the optical axis direction by the drive frame, then the lens barrel can be made more compact, but the frames must be precisely positioned to utilize the holding space effectively
Solution Approach 1:
The linear coupling portion acts as an intermediary element between the bayonet coupling portion and the moving frame. It mediates the connection by maintaining precise axial positioning while allowing the bayonet coupling to provide secure rotational connection, thereby enabling compact design without requiring extremely high manufacturing precision.
Solution Approach 2:
The linear coupling portion is designed to preliminarily establish the axial positioning relationship between frames before the bayonet coupling is fully engaged. This preliminary action ensures that the holding space is correctly positioned to receive the moving frame, reducing the precision requirements for the final assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables a more compact lens barrel by allowing part of the moving frame to be inserted into the holding space, reducing the overall length in the optical axis direction and enhancing the compactness of the lens barrel without compromising movement capabilities.
Implementation Method 1
The drive frame includes a cam mechanism and is configured to guide the moving frame in the optical axis direction with the cam mechanism
Implementation Method 2
The rotary guide portion is configured to support the rectilinear guide frame so that the rectilinear guide frame rotates with relative to the cam mechanism and doesn't move relatively in the optical axis direction
Implementation Method 3
The rectilinear guide frame is configured to support the moving frame so that the moving frame moves in the optical axis direction but doesn't rotate
Data Source
AI summary
The lens barrel includes a moving frame, a drive frame, and a rectilinear guide frame. The drive frame includes a cam mechanism and guides the moving frame in the optical axis direction with the cam mechanism. The rectilinear guide frame supports the moving frame so that the moving frame moves in the optical axis direction but doesn't rotate. The drive frame includes a rotary guide portion. The rotary guide portion supports the rectilinear guide frame so that the rectilinear guide frame rotates with relative to the cam mechanism and doesn't move relatively in the optical axis direction. The rotary guide portion is disposed on the outer peripheral side of the cam mechanism and on the outer peripheral side of the moving frame. A holding space is formed between the cam mechanism and the rotary guide portion. Part of the moving frame is inserted into the holding space.