Lens Barrel Eccentric Adjustment for Compact Flange Back Tuning
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Solution Overview
Problem
Existing optical apparatuses face challenges in maintaining optical characteristics due to dimensional errors, which are exacerbated by the need for larger components to achieve sufficient flange back adjustment, leading to increased size and complexity.
Innovation Solution
A mechanism that allows for flange back adjustment by rotating a movable barrel around the optical axis using an operating member with an eccentric shaft, which engages with a guide on the movable barrel, enabling precise adjustment without increasing the apparatus size by utilizing a non-circular hole and a helicoid mechanism for linear motion conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between the rotating shaft and the eccentric shaft of the operating portion is increased to increase the moving amount of the movable barrel, then the moving amount of the movable barrel is improved, but the operating portion is increased in size and the diameter of the circular hole portion of the fixed barrel must be increased
Solution Approach 1:
The patent applies dimensionality change by moving the eccentric shaft from a planar arrangement to a three-dimensional configuration where the eccentric shaft extends in the optical axis direction. This allows the operating portion to achieve a larger moving amount without increasing the radial distance between rotating shaft and eccentric shaft, thereby maintaining a compact fixed barrel diameter while improving the moving amount of the movable barrel.
2Adaptability or versatility
If the operating portion is increased in size to achieve sufficient flange back adjustment, then the adjustment capability is improved, but the overall size of the optical apparatus is increased
Solution Approach 1:
The patent implements nesting by placing the eccentric shaft inside the fixed barrel, with the eccentric shaft extending in the optical axis direction and being engaged with the movable barrel. This nested configuration allows the operating portion to achieve sufficient flange back adjustment capability while maintaining a compact overall size, as the eccentric shaft is contained within the existing fixed barrel structure rather than requiring additional external space.
3Adaptability or versatility
If a conventional operating mechanism is used to achieve flange back adjustment, then the adjustment function is provided, but the device complexity and number of components are increased
Solution Approach 1:
The patent merges the operating member and the eccentric shaft into a single integrated component. The operating member includes the rotating shaft and the eccentric shaft as one piece, which reduces the number of components and simplifies the structure. This merging maintains the optical characteristic adjustment function while reducing device complexity compared to separate operating mechanisms.
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
Enables precise optical characteristic adjustment while maintaining a compact size, improving dust and water resistance, and ensuring stable flange back adjustment without enlarging the apparatus, thus enhancing the overall performance and miniaturization.
Implementation Method 1
a helicoid mechanism that converts rotation of the movable barrel around the optical axis into movement of the movable barrel in the optical axis direction
Implementation Method 2
an operating member disposed through the fixed barrel and rotationally operated, wherein the operating member comprises a rotating shaft and an engaging portion eccentric from the rotating shaft
Data Source
AI summary
A lens apparatus comprises a fixed barrel, a movable barrel, a mechanism configured to move the movable barrel along an optical axis by rotation of the movable barrel around the optical axis, and an operating member disposed through the fixed barrel and rotationally operated. The operating member comprises a rotating shaft and an engaging portion eccentric from the rotating shaft. The rotating shaft is rotated with the operating member being rotationally operated, the engaging portion is engaged with a guide formed in the movable barrel along the optical axis. At least a part of the engaging portion is located outside the rotating shaft in a direction orthogonal to the rotating shaft. Rotation of the operating member causes the engaging portion to slide on the guide, the movable barrel to rotate around the optical axis, and the mechanism to move the movable barrel along the optical axis.