Optical Apparatus Asymmetric Guide Member Compact Design
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Solution Overview
Problem
Existing lens barrel designs face challenges in further reducing size while maintaining stable biasing and guiding mechanisms, particularly due to the cylindrical shape of guide members which complicates the arrangement of peripheral components.
Innovation Solution
The optical apparatus incorporates a first holding member with a linear guide portion and a regulating portion, utilizing a biasing member to transmit driving force and maintain alignment, with a sliding surface range of ±90 degrees and a cutout portion to accommodate other components, allowing for compact design and stable biasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical sleeve hole is used as the fitting portion for the guide bar, then the guide member can maintain stable guiding, but the peripheral members cannot be compactly arranged and size reduction is difficult
Solution Approach 1:
The guide member is designed with an asymmetric cross-section (rectangular or oval) instead of a symmetric cylindrical shape. This asymmetric shape allows the guide member to maintain stable guiding while enabling compact arrangement of peripheral members, as the non-circular shape can be more efficiently packed within the lens barrel structure.
Solution Approach 2:
The invention changes the dimensional characteristics of the guide member from a cylindrical shape (round in all cross-sections) to a shape with different dimensional properties (rectangular or oval with distinct width and height dimensions). This dimensional change allows for more flexible spatial arrangement and reduces the overall footprint required for stable guiding.
2Device complexity
If a single biasing member is used to eliminate backlash, then the structure is simplified, but the sliding surface experiences uneven force distribution
Solution Approach 1:
The single biasing member is segmented into multiple biasing members that are distributed around the guide member. This segmentation allows each biasing member to apply force at different locations, creating a more uniform force distribution across the sliding surface while maintaining the simplified structure of using spring-based biasing elements.
Solution Approach 2:
Multiple biasing members are positioned at specific locations around the guide member to create localized force application points. This local quality approach ensures that force is distributed uniformly across the sliding surface, with each biasing member addressing specific regional requirements for force application.
3Volume of moving object
If the linear guide portion is made compact with cutout portions, then space is saved, but the sliding surface must be precisely positioned within ±90 degrees range
Solution Approach 1:
The linear guide portion is designed with asymmetric cutout portions that create a specific geometric configuration. This asymmetric design naturally positions the sliding surface within the required ±90 degrees range while maximizing space savings. The asymmetric shape provides built-in geometric constraints that guide proper positioning during assembly.
Solution Approach 2:
The cutout portions are designed in advance to pre-position the sliding surface at the correct angular location. This preliminary action through geometric design ensures that when the linear guide portion is assembled, the sliding surface is automatically positioned within the required ±90 degrees range, reducing the need for post-assembly adjustment.
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 configuration enables miniaturization of the optical apparatus while ensuring stable biasing and guiding in various attitudes, effectively addressing the size reduction challenges faced by existing designs.
Implementation Method 1
a first biasing member configured to bias the first holding member and the first driving unit and to bias the first holding member and the first guide member
Implementation Method 2
a sliding surface of the first linear guide portion that slides with respect to the first guide member
Data Source
AI summary
An optical apparatus comprises first holding member, first guide member and second guide member, and first biasing member. The first holding member includes first linear guide portion, and first regulating portion. Sliding surface of the first linear guide portion exists in a range of ±90 degrees around first axis from intersection between straight line drawn from center of the first axis and outer peripheral surface of the first guide member in reaction force direction of resultant force formed by first force applied to the first holding member by the first biasing member and second force received by the first regulating portion from the second guide member. The first linear guide portion has a cutout portion in a range not including the sliding surface. A part of the first guide member exists in the cutout portion. The first guide member is disposed so as to overlap the first linear guide portion.