Optical Filter Apparatus Radial Guide Bar Nesting
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Solution Overview
Problem
Existing optical filter apparatuses with short flange focal length distances require further thinning in the optical axis direction to accommodate the structure of image pickup apparatuses, as previous thinning schemes are insufficient.
Innovation Solution
The optical filter apparatus includes a first and second optical filter unit held by respective holding frames, supported by guide bars, and housed within a structure that allows for sliding mechanisms to reduce thickness, with a driving unit enabling the insertion or retraction of filters along guide bars, achieving a thinner configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical filters are stacked in the optical axis direction, then the filter functionality is improved, but the apparatus thickness increases
Solution Approach 1:
The patent transitions from stacking filters along the optical axis (one dimension) to arranging filters side-by-side in the radial direction (another dimension). Multiple holding frames are positioned at different radial locations around the optical axis, allowing multiple filters to coexist without increasing optical path length. This dimensional reconfiguration resolves the contradiction by maintaining thin profile while supporting multiple filter functions.
Solution Approach 2:
The patent implements a nested structure where multiple holding frames containing optical filters are arranged concentrically around the optical axis. Each holding frame is positioned at a different radial distance from the optical axis, creating a nested configuration similar to dolls within dolls. This allows multiple filters to be integrated into a compact cylindrical volume without increasing the optical path thickness.
2Length of moving object
If the guide bar position is shifted to reduce thickness, then the apparatus becomes thinner, but the structural stability deteriorates
Solution Approach 1:
Instead of compromising structural stability by shifting guide bar positions along the optical axis, the patent distributes structural support across multiple radial dimensions. Multiple guide bars are arranged at different radial positions, each supporting its corresponding holding frame. This multi-dimensional support structure maintains structural integrity while keeping the optical path thickness minimal.
Solution Approach 2:
The guide bars serve multiple functions: they provide structural support for the holding frames, enable radial positioning of multiple filter assemblies, and maintain the compact cylindrical configuration. This multi-functionality allows the structure to achieve thin profile without sacrificing stability, as the same components perform both support and positioning roles.
Data Source
AI summary
An optical filter apparatus includes a first optical filter unit, a first holding frame that holds the first optical filter unit, a first guide bar and a second guide bar that movably support the first holding frame, a second optical filter unit disposed approximately parallel to the first optical filter unit, a second holding frame that holds the second optical filter unit, a third guide bar and a fourth guide bar that movably support the second holding frame, a first housing that covers the first holding frame, and a second housing that covers the second holding frame. The first holding frame is sandwiched between the first housing and one of the first guide bar and the second guide bar. The second holding frame is sandwiched between the second housing and one of the third guide bar and the fourth guide bar.