Eccentric Lens-Barrel Actuation for Compact Flange-Back Adjustment
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Solution Overview
Problem
Existing optical apparatuses face challenges in maintaining optical characteristics due to dimensional errors, requiring larger components for adjusting the focus surface, which increases the size of the apparatus.
Innovation Solution
A mechanism that allows for adjusting the position of a movable barrel along the optical axis through rotation, using a rotating shaft and an engaging portion eccentric from the shaft, with parts of the engaging portion located outside the rotating shaft, enabling efficient adjustment without increasing the apparatus size.
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 positioning the engaging portion at an eccentric location relative to the rotating shaft, utilizing the radial dimension to convert rotational motion into linear motion. This allows the operating portion to maintain a compact size while achieving sufficient moving amount through the eccentric geometry rather than increasing the diameter of the hole portion.
Solution Approach 2:
The patent employs asymmetry by designing the engaging portion at an eccentric position rather than at the center of the rotating shaft. This asymmetric configuration enables the converting mechanism to generate effective linear motion with a smaller operating portion, resolving the contradiction between moving amount and component size.
2Length of moving object
If the operating portion is increased in size to increase the moving amount of the movable barrel, then the moving amount of the movable barrel is improved, but the overall size of the apparatus is increased
Solution Approach 1:
The patent utilizes the radial dimension through eccentric positioning to achieve the desired moving amount without increasing the overall volume of the apparatus. The engaging portion operates within the existing circular hole portion, converting rotational motion efficiently through eccentric geometry rather than requiring a larger operating portion.
Solution Approach 2:
The patent changes the geometric parameters of the converting mechanism by using eccentric positioning of the engaging portion. This parameter change allows the same moving amount to be achieved with a smaller operating portion, as the eccentricity factor amplifies the motion conversion efficiency.
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 mechanism enables precise optical characteristic adjustment while maintaining a compact apparatus size, improving dust and water resistance, and ensuring stable and accurate flange back adjustments.
Implementation Method 1
the operating member comprises a rotating shaft and an engaging portion eccentric from the rotating shaft, the rotating shaft being rotated with the operating member being rotationally operated, the engaging portion being engaged with a guide formed in the movable barrel along the optical axis
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.