Compact Lens Barrel Using Nested Drive Gear for Telescopic Adjustment
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Solution Overview
Problem
Conventional lens barrels for imaging devices become larger and more complex as their performance increases, making them less compact.
Innovation Solution
A lens barrel design featuring a rotary frame with a gear component on its inner surface, a drive gear, and a motor, where the gear component meshes with the drive gear to allow for compact size and high performance by maintaining a constant meshing length, enabling easier control of the driving force and allowing the lens barrel to telescope for size adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of parts is increased to improve imaging device performance, then the performance is improved, but the lens barrel becomes larger in size
Solution Approach 1:
The rotary frame is rotatably supported within the fixed frame, and the gear component is formed on the inner peripheral surface of the rotary frame. The drive gear is positioned such that the gear component moves within its range during rotation, creating a nested arrangement where multiple components occupy overlapping spatial volumes, thereby reducing the overall lens barrel size while maintaining high-performance functionality.
2Volume of moving object
If the gear component length is made shorter to reduce size, then the compactness is improved, but the driving force control becomes more difficult
Solution Approach 1:
The drive gear is designed with a length greater than the gear component, creating a localized region where the gear component moves within the drive gear's range during rotary frame rotation. This local configuration ensures that the meshing length between the gear component and drive gear remains constant throughout the motion, providing stable driving force control while allowing the gear component to be compact.
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
The design achieves a high-performance, compact lens barrel that can telescope for size adjustment, maintaining consistent gear meshing length for controlled driving force, enhancing usability and compactness.
Implementation Method 1
The gear component meshes with the drive gear so that during rotation of the drive gear the rotary frame rotates, via the driving force, relative to the base component and advances and retracts along a rotational axis of the lens barrel
Data Source
AI summary
A lens barrel is provided that includes a base, a motor, a drive gear, and a rotary frame. The motor is fixed to the base and produces a driving force. The drive gear is coupled to the base and configured to transmit the driving force. The rotary frame has a substantially cylindrical shape and a gear component disposed on at least part of its inner peripheral surface. The gear component meshes with the drive gear so that during rotation of the drive gear the rotary frame rotates, via the driving force, relative to the base component and advances and retracts along a rotational axis of the lens barrel. The length of the drive gear is greater than the length of the gear component, and as the rotary frame and the gear component advance and retract, the gear component remains within a range of opposing ends of the drive gear.