Nested Lens Barrel Structure for Stray Light Control
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Solution Overview
Problem
Conventional lens barrels with zoom mechanisms face challenges in achieving high zoom magnification while maintaining a compact configuration, as they often expose end surfaces of guide and cam barrels, allowing unnecessary light to enter and compromising image quality.
Innovation Solution
The design includes a first guide barrel and first cam barrel for linear and rotational movement of the first lens system, with a second guide barrel and second cam barrel for the linear movement barrel, positioned between the second guide barrel and second cam barrel, ensuring that the linear movement barrel is disposed between the second guide barrel on the outer circumference and the second cam barrel on the inner circumference, preventing exposure of cam and guide grooves and reducing the likelihood of stray light entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If end surfaces of guide barrels and cam barrels are exposed to the outside to simplify structure, then device complexity is reduced, but light shielding performance deteriorates allowing unnecessary light to enter
Solution Approach 1:
The linear movement barrel is disposed between the second guide barrel and the second cam barrel, creating a nested arrangement where the linear movement barrel is positioned within the space between these two barrels. This nested configuration allows the linear movement barrel to serve as an additional light-shielding element without adding external components, thus preventing stray light from entering through the gaps while maintaining structural simplicity.
2Manufacturing precision
If zoom magnification is increased by increasing moving amount of lens units, then imaging performance is improved, but lens barrel configuration becomes larger
Solution Approach 1:
The patent employs a multi-retractable configuration where the linear movement barrel is nested between the second guide barrel and second cam barrel. This nested arrangement allows for increased moving amounts of lens units during zooming by utilizing the space efficiently, enabling larger zoom magnification without proportionally increasing the overall lens barrel size. The nested structure permits greater travel distance for the lens units while keeping the external dimensions compact.
Data Source
AI summary
A lens barrel includes a first guide barrel, a first cam barrel, a linear movement barrel, a second guide barrel configured to guide a linear movement of the linear movement barrel in the optical axis direction, and a second cam barrel movable in the optical axis direction as the second guide barrel moves in the optical axis direction, and rotatable around the optical axis relative to the second guide barrel, and the second cam barrel including a second cam configured to move the linear movement barrel in the optical axis direction by a rotation of the second cam barrel. The linear movement barrel is disposed between the second guide barrel disposed on an outer circumference of the linear movement barrel and the second cam barrel disposed on an inner circumference of the linear movement barrel.