Zoom Lens Counterweight Structure for Center of Gravity Stability
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Solution Overview
Problem
Existing lens devices face challenges in reducing size and weight while maintaining stability, particularly when a dedicated motor is used to move weights that inhibit changes in the center of gravity during zoom and focus operations, making it difficult to achieve balanced weight distribution.
Innovation Solution
The lens device incorporates a first and second moving member with specific gravity greater than the lenses, which move in the optical axis direction and opposite to the center of gravity movement, utilizing cam structures to maintain balance and inhibit changes in the center of gravity, thereby simplifying the structure and stabilizing the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dedicated motor is used to move a weight that inhibits change in the center of gravity, then the position of the center of gravity can be stabilized, but the size and weight of the lens device increase
Solution Approach 1:
The patent combines the weight moving function with the existing zoom lens barrel structure. The weight is integrated into the zoom lens barrel assembly rather than being a separate component, allowing the weight to move passively with the zoom lens barrel while the zoom lens barrel performs its optical function. This merging eliminates the need for a dedicated motor while maintaining center of gravity stability.
Solution Approach 2:
The zoom lens barrel serves multiple functions: it moves the zoom lenses for optical zooming and simultaneously moves the weight to maintain center of gravity stability. By making the weight movement mechanism part of the existing zoom mechanism, the system achieves multi-functionality without adding separate drive systems, thereby reducing overall device weight.
2Stability of the object's composition
If a dedicated motor is used to move a weight that inhibits change in the center of gravity, then the position of the center of gravity can be stabilized, but the device complexity increases
Solution Approach 1:
The patent merges the weight drive mechanism with the zoom lens drive mechanism. The weight is coupled to the zoom lens barrel so that when the zoom lens barrel moves during zooming, the weight moves accordingly. This integration eliminates the need for a separate dedicated motor and control system for the weight, thereby reducing device complexity while maintaining center of gravity stability.
Solution Approach 2:
The weight movement is achieved through passive coupling to the zoom lens barrel movement. The zoom lens barrel's own motion serves to drive the weight, eliminating the need for an active dedicated motor system. The system uses its existing operational movements to simultaneously accomplish weight positioning, reducing overall system complexity.
3Weight of moving object
If the lens device structure is simplified to reduce size and weight, then the device becomes more compact, but the ability to inhibit center of gravity change deteriorates
Solution Approach 1:
The patent combines the weight stabilization function with the existing zoom lens structure. The weight is integrated into the zoom lens barrel assembly and moves passively with it. This merging allows the system to maintain center of gravity stability without adding separate heavy components or complex mechanisms, achieving both compactness and stability.
Solution Approach 2:
The patent uses a weight with specific gravity greater than the lenses that moves in the opposite direction to the center of gravity change. This counterweight mechanism, integrated into the zoom lens barrel, compensates for center of gravity shifts during zooming and focusing operations, maintaining overall stability while keeping the device compact and lightweight.
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 solution effectively inhibits changes in the center of gravity during zoom and focus actions, reducing drive torque on the gimbal and ensuring more stable flight for aerial vehicles, while allowing for compact and lightweight lens designs.
Implementation Method 1
The first physical structure can include a first cam portion provided to one of the first lens holding member and the first moving member. The first physical structure can include a first follower portion provided to the other of the first lens holding member and the first moving member, the first follower portion moving along a cam surface of the first cam portion and thereby causing the first lens holding member and the first moving member to move relative to each other.
Data Source
AI summary
A lens device includes a first lens system including a first lens, a second lens system including a second lens, a moving member configured to move in an optical axis direction of the first lens, and a physical structure configured to move the first lens in the optical axis direction and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens.