Lens Barrel Prism Mounting via UV Curing Through-Holes
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Solution Overview
Problem
Conventional lens barrels with bending optical systems face challenges in reducing manufacturing costs and achieving high optical performance due to inaccuracies in adhesive application and mounting, leading to increased costs and potential optical deterioration.
Innovation Solution
The lens barrel design incorporates concave portions on the lens frame to facilitate simultaneous filling and UV curing of adhesive, reducing the need for repositioning and separate irradiation, while also stabilizing the bending member's position to maintain optical accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive agent is filled in the gap between prism and lens frame and cured by UV irradiation from multiple directions, then adhesive bonding is achieved, but manufacturing time and cost increase due to repeated repositioning and multiple irradiation steps
Solution Approach 1:
The patent introduces a through-hole dimension that penetrates the lens frame, allowing UV irradiation to access the adhesive from the rear side. This dimensional change enables simultaneous multi-directional curing without requiring multiple repositioning steps, as the UV light can now pass through the lens frame via the through-hole to cure adhesive on both sides of the prism in a single operation.
Solution Approach 2:
The through-hole acts as an intermediary pathway that facilitates UV light transmission from the rear side of the lens frame to the adhesive layer. This intermediary structure enables the curing process to occur from multiple directions simultaneously without requiring complex external irradiation setups, thereby reducing manufacturing steps and time.
2Manufacturing precision
If prism is mounted with high accuracy to maintain optical performance, then optical quality is improved, but mounting complexity and cost increase
Solution Approach 1:
The invention employs self-aligning features including a fitting protrusion on the prism that fits into a corresponding fitting groove on the lens frame, and a positioning protrusion that engages with a positioning groove. These self-service mechanisms automatically ensure accurate positioning during assembly without requiring complex external alignment tools or procedures, thereby maintaining high mounting accuracy while simplifying the mounting process.
Solution Approach 2:
The prism and lens frame are designed with pre-formed fitting and positioning features that establish accurate alignment before the adhesive bonding process. The fitting protrusion and groove, along with positioning protrusions and grooves, are manufactured in advance to ensure proper geometric relationships, eliminating the need for complex real-time alignment procedures during assembly.
3Strength
If adhesive agent is applied to ensure proper bonding, then bonding strength is achieved, but adhesive may contaminate optical surfaces and deteriorate optical performance
Solution Approach 1:
The invention extracts the adhesive application area from the optical path by confining adhesive to specific non-optical regions. The fitting groove and positioning grooves are designed to contain adhesive away from optical surfaces, and the through-hole structure allows UV curing without requiring adhesive near optical paths. This extraction ensures bonding strength is achieved in designated areas while preventing contamination of optical surfaces.
Solution Approach 2:
The design applies adhesive selectively to local areas defined by the fitting groove and positioning grooves, rather than broadly across the prism surface. This localized adhesive application ensures sufficient bonding strength at critical interfaces while minimizing the risk of adhesive contamination reaching optical surfaces, thereby resolving the contradiction between bonding strength and optical quality.
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 approach reduces manufacturing steps and costs, enhances optical performance by minimizing adhesive-related issues, and maintains high precision in the bending member's alignment, thereby improving overall lens barrel performance.
Implementation Method 1
the adhesive agent used for the fixation of the lens is an ultraviolet cure adhesive. Therefore, it is necessary to irradiate the adhesive agent that is filled in the gap between the prism side surface and the lens frame with ultraviolet radiation.
Data Source
AI summary
A lens barrel includes a fourth lens, a prism, and a sixth lens. The fourth lens receives a light flux incident along a first optical axis. The prism includes a reflecting surface reflecting the light flux passing through the fourth lens to a direction along a second optical axis intersecting with the first optical axis. The sixth lens receives the light flux reflected by the prism. A second group frame includes an opening portion, a prism retaining frame that is arranged in a more inner position than the opening portion and in which the prism is contained, and a plurality of adhesive pockets arranged on an area around the prism retaining frame and being open to the side of the opening portion. Adhesive agent is filled in the adhesive pockets.