Filter Holder Overlap Reduces Backfocus in Imaging Lens
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional imaging apparatuses with filter insertion/removal mechanisms face challenges in shortening the backfocus due to the extended thickness of the filter mechanism, which affects the size of the imaging apparatus.
Innovation Solution
The imaging apparatus includes a lens holder with an opening to hold a lens and a filter holder that allows the filter to be partially arranged within the opening of the lens holder, overlapping with the lens holder as viewed perpendicular to the optical axis, thereby reducing the space required for filter insertion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a filter insertion/removal mechanism is arranged in front of an imaging element, then imaging can be performed in low-illumination environments, but the backfocus is extended in proportion to the thickness of the mechanism, increasing the size of the imaging apparatus
Solution Approach 1:
The filter holder is designed to arrange the filter at a position overlapping the lens holder as viewed from a direction perpendicular to the optical axis. This spatial reconfiguration in a different dimension allows the filter to be positioned without extending the backfocus length along the optical axis, thereby resolving the contradiction between maintaining imaging capability and reducing apparatus size
2Length of stationary object
If the filter is arranged outside the optical path to shorten backfocus, then the thickness in the optical path is reduced, but the positional relationship between the lens holding frame and filter holding frame is not considered, which may cause the backfocus to become long
Solution Approach 1:
The filter is positioned at a specific location that overlaps the lens holder opening in the perpendicular direction, creating a localized arrangement that shortens backfocus while maintaining proper optical functionality. This precise local positioning ensures the filter can be inserted and removed without affecting the overall backfocus length
3Length of stationary object
If the filter holder overlaps the lens holder as viewed perpendicular to the optical axis, then the backfocus is shortened and apparatus size is reduced, but the structural complexity of the holder arrangement increases
Solution Approach 1:
The filter holder and lens holder are designed to overlap in space, merging their functional zones. The filter holder is positioned to utilize the opening of the lens holder, combining the support structures of both holders into a more integrated arrangement that reduces overall backfocus length without requiring entirely separate mounting paths
Data Source
AI summary
An imaging apparatus includes a lens holder having an opening and configured to hold a lens, and a filter holder configured to hold a filter such that the filter is insertable to and removable from an optical path of the lens, wherein at least one of the filter or the filter holder is at least partially arranged in the opening so as to overlap at least a portion of the lens holder as viewed in a direction perpendicular to an optical axis direction of the lens.