Sealing Member Protrusions for Optical Filter Positioning
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Solution Overview
Problem
Existing image pickup apparatuses face challenges in maintaining accurate positioning of sealing members and applying a proper elastic repulsion force, especially when the optical filter is thin, leading to potential interference and increased risk of the image pickup device peeling off during position adjustments.
Innovation Solution
The image pickup apparatus includes a first holding member with an opening portion for guiding light flux and an abutment surface, and a sealing member with protrusions extending along the outer shape of the optical member inside the opening portion, allowing for precise positioning and controlled elastic repulsion force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical filter is made thin, then the device complexity is reduced and material usage is decreased, but the positioning accuracy of the sealing member deteriorates and the risk of interference with the holding frame increases
Solution Approach 1:
The sealing member incorporates protrusions that extend in the optical axis direction (first direction) along the outer shape of the optical filter. This three-dimensional positioning structure provides anchoring in the thickness direction without requiring increased filter thickness, resolving the contradiction between thin filter design and positioning accuracy.
Solution Approach 2:
The protrusions on the sealing member act as intermediary elements that bridge the gap between the thin optical filter and the holding frame. These protrusions engage with corresponding recesses or surfaces, providing stable positioning and preventing interference without requiring the filter itself to be thick.
2Ease of operation
If the sealing member is deformed more during position adjustment, then the positioning flexibility is improved, but the elastic repulsion force applied to the image pickup device increases excessively causing peeling risk
Solution Approach 1:
The sealing member features localized protrusions at specific positions corresponding to the outer shape of the optical filter. These protrusions concentrate the deformation and elastic repulsion force at discrete locations rather than distributing it uniformly, allowing controlled deformation during positioning while maintaining adequate bonding strength at critical interfaces.
Solution Approach 2:
The sealing member is segmented into multiple protrusions rather than being a continuous uniform structure. This segmentation allows different regions of the sealing member to deform independently during position adjustment, providing positioning flexibility while limiting the total elastic repulsion force applied to the image pickup device.
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 maintains accurate positioning of the sealing member and applies a proper elastic repulsion force to the image pickup device, preventing interference and ensuring stable attachment during position adjustments, even with thin optical filters.
Implementation Method 1
a sealing member formed of an elastic material, such as rubber, is disposed between the image pickup device and the optical filter
Data Source
AI summary
An image pickup apparatus capable of maintaining accuracy of positioning a sealing member and also applying a proper elastic repulsion force to an image pickup device. A first holding member holds an image pickup device, a first optical member is disposed forward of the device in a first direction orthogonal to an image pickup surface of the device, and a sealing member is sandwiched and held between the first optical member and the device. The first holding member has an opening portion for guiding light flux having passed through a photographing optical system to the device, and an abutment surface brought into contact with part of the first optical member. The sealing member has protrusions each extending forward in the first direction, along an outer shape of the first optical member inside the opening portion of the first holding member, as viewed in the first direction.