Optical Apparatus Guide Shaft Inclination Prevention
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Solution Overview
Problem
Existing optical apparatuses face challenges in maintaining the alignment and positioning accuracy of guide shafts due to the inclination caused by the fixation of driving sources and guide shafts, which affects the optical performance and downsizing of lens barrels.
Innovation Solution
The optical apparatus includes a driving unit fixed to a holder using a screw and nut configuration, where the nut's plane parts are oriented orthogonally to the guide and screw centers, preventing deformation and inclination, and allowing for increased freedom in arrangement of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the driving source and guide shaft are fixed close to each other using screws, then the apparatus can be downsized, but the pilot hole expansion during screw fastening causes the guide shaft to incline
Solution Approach 1:
The patent divides the fixation system into two separate components: the driving source is fixed to the lens barrel, while the guide shaft is fixed to the driving source. This segmentation allows the guide shaft to be positioned at a distance from the fixation point, avoiding the pilot hole expansion issue while maintaining compact overall dimensions.
Solution Approach 2:
The driving source acts as an intermediary component between the lens barrel and the guide shaft. By fixing the guide shaft to the driving source rather than directly to the lens barrel, the patent eliminates the direct connection that would cause inclination, while still achieving compact integration through the intermediate mounting structure.
2Device complexity
If the guide shaft is fixed close to the driving source fixation point, then the apparatus structure is compact, but the fixation process causes guide shaft inclination and reduced positioning accuracy
Solution Approach 1:
The patent segments the fixation process into two independent operations: fixing the driving source to the lens barrel, and separately fixing the guide shaft to the driving source. This allows the guide shaft to be positioned at an optimized distance from the lens barrel fixation point, preventing inclination while maintaining structural compactness.
Solution Approach 2:
The patent resolves the spatial conflict by utilizing the dimensional freedom provided by the intermediate mounting structure. The guide shaft can be positioned in three-dimensional space relative to the lens barrel, allowing optimal positioning that avoids the inclination problem while maintaining compact overall dimensions.
Data Source
AI summary
An optical apparatus includes a driving unit, a holder holding the driving unit, a moving member holding an optical member and movable by drive of the driving unit, and a guide fixed to the holder in parallel to an optical axis direction. The driving unit is fixed to the holder by a screw and a nut. The nut includes a first plane part. The nut is disposed so that the first plane part of the nut is substantially orthogonal to a line connecting a center of the guide and centers of the screw and the nut when viewed in the optical axis direction.