Integrated Cam Barrel Lens Barrel Design for Focus Stability
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Solution Overview
Problem
Existing lens barrels with multiple cam barrels for focus units suffer from low accuracy in holding positions due to separate components, leading to focus variation during zooming operations.
Innovation Solution
A lens barrel design incorporating a first cam barrel for rotation about the optical axis, a second cam barrel for linear movement in synchronization with the first, and a third cam barrel for both linear movement and rotation, with specific cam grooves and linear movement grooves to engage and hold multiple focus units accurately, reducing focus variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple focus lens units are held by separate components (rotating barrel and cam barrels), then the lens barrel can achieve focus and zoom functions, but position holding accuracy deteriorates due to position shifts between components
Solution Approach 1:
The patent merges the rotating barrel and multiple cam barrels into a single integrated cam barrel structure. This unified barrel contains multiple cam grooves that simultaneously control the movement of multiple focus lens units, eliminating position shifts between separate components and improving position holding accuracy while maintaining the necessary focus and zoom functions
2Reliability
If separate components are used to hold focus lens units, then the lens barrel structure can accommodate multiple functions, but focus variation occurs during zooming operations
Solution Approach 1:
The integrated cam barrel combines multiple cam grooves in a single component, ensuring synchronized movement of focus lens units during zooming operations. This unified structure eliminates the focus variation that occurs when separate components move independently, while the multiple cam grooves within the single barrel maintain the complex focus and zoom control functions
Data Source
AI summary
A lens barrel 2 includes an optical system including a first lens unit held by a first holder and a second lens unit held by a second holder. The lens barrel 2 includes a first cam barrel 22 to be driven rotatably about an optical axis of the optical system in zooming, a second cam barrel 29 to be driven in an optical axis direction of the optical system in synchronization with the first cam barrel 22, and a third cam barrel 28 to be driven in the optical axis direction in synchronization with the first cam barrel 22 and driven rotatably about the optical axis in focusing. The second cam barrel 29 is provided with a first linear movement groove and a first cam groove. The third cam barrel 28 is provided with a second cam groove and a second linear movement groove.