Lens Holder Step Structure for Stable Optical Filter Fixing
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Solution Overview
Problem
Existing lens units face issues with incomplete fixation of optical filters due to rattling from vibrations when fixed by claw parts, and degradation of optical performance when fixed with adhesives.
Innovation Solution
A lens unit design that uses an adhesive to secure the optical filter to the side of the adhesive, with a ring-shaped slope part, and the adhesive to secure the optical filter, incorporating a step part to interrupt capillary force and a claw part to prevent floating, while using an adhesive with ultraviolet and moisture-curing properties to ensure stable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an optical filter is fixed only by a claw part, then the structure is simple and easy to manufacture, but the optical filter is not fixed completely and may rattle due to vibration
Solution Approach 1:
The patent combines two fixation methods: adhesive fixation and claw part engagement. The adhesive is applied to the mounting surface to provide reliable fixation and eliminate rattling, while the claw part provides mechanical support and positioning. This combination resolves the contradiction by achieving both ease of manufacture and reliable fixation.
2Reliability
If an optical filter is fixed by an adhesive, then the fixation is complete and rattling is prevented, but the adhesive may adhere to the lens and degrade optical performance
Solution Approach 1:
The patent segments the end face into distinct functional zones: a mounting surface for adhesive application, a slope face to guide adhesive flow, and a claw part engagement region. This segmentation prevents adhesive from reaching the lens by confining it to specific areas, thus maintaining optical performance while ensuring reliable fixation.
Solution Approach 2:
The slope face acts as an intermediary element between the mounting surface and the lens. It guides the adhesive flow away from the lens area, preventing direct contact between the adhesive and the lens. This intermediary structure resolves the contradiction by enabling complete fixation while protecting the lens from adhesive contamination.
3Ease of operation
If a clearance is provided for the optical filter, then the optical filter can be easily installed, but the optical filter may move laterally and rattle due to vibration
Solution Approach 1:
The patent uses a two-stage fixation process: initially, the optical filter is placed with clearance on the mounting surface for easy installation; then, the adhesive is applied to eliminate the clearance and prevent lateral movement. The claw part provides ongoing mechanical constraint. This dynamic approach resolves the contradiction by enabling easy installation followed by stable positioning.
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
The design effectively prevents rattling and adhesive contamination of lenses, maintaining optical performance by securely fixing the optical filter with both adhesive and claw parts, ensuring stable adhesion and reduced clearance.
Implementation Method 1
The mounting surface is filled with an adhesive on a lateral side of a side face of the optical filter so as to adhere to the side face
Implementation Method 2
although the adhesive infiltrates between a plate face of the optical filter and a mounting surface by capillary force
Data Source
AI summary
A lens unit is provided which includes a lens, an optical filter which is a filter in a flat plate shape, and a lens holder which holds the lens and the optical filter. The optical filter is disposed on an end face on one side in an optical axis direction of the lens holder, the end face is provided with an opening part where a lens face of the lens is exposed and a mounting surface which is a flat face part supporting the optical filter, the mounting surface is filled with an adhesive on a lateral side of a side face of the optical filter so that the adhesive adheres to the side face, and a step part forming a gap space between a plate face of the optical filter and the end face is provided between the opening part of the end face and the mounting surface.