Optical Device Adhesive Joint Structure for Miniaturized Strength
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Solution Overview
Problem
Existing optical devices face challenges in maintaining joint strength when the diameter is reduced, particularly with adhesive joining methods, which are inferior to welding in terms of strength.
Innovation Solution
The optical device incorporates a light guide member, a holding member, an optical element, and a holder joined using an adhesive, with a joint structure featuring rotationally symmetric joint projections that allow for increased adhesive injection and curing along the optical axis, enhancing joint strength and minimizing relative positional shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the optical device is reduced, then the device size is minimized, but the joint strength decreases due to reduced joint area
Solution Approach 1:
The joint structure transitions from a two-dimensional parallel joint surface to a three-dimensional configuration where joint surfaces extend along the optical axis direction. The first and second joint surfaces are formed on opposing sides of the adhesive layer perpendicular to the optical axis, creating a multi-dimensional joint geometry that increases effective bonding area without increasing device diameter.
Solution Approach 2:
The joint structure is divided into multiple segments: first joint surface, second joint surface, and intermediate joint surface(s), with adhesive layers positioned between them. This segmentation allows the joint strength to be distributed across multiple bonding interfaces along the optical axis, compensating for the reduced radial joint area in miniaturized devices.
2Ease of manufacture
If adhesive joining is used instead of welding, then the device can be manufactured with simpler processes, but the joint strength is inferior
Solution Approach 1:
The adhesive joint extends in the optical axis direction with multiple joint surfaces positioned at different locations along this dimension. This three-dimensional adhesive configuration compensates for the inherently lower strength of adhesive bonding by distributing the mechanical load across multiple bonding interfaces, achieving joint strength comparable to welding while maintaining manufacturing simplicity.
Solution Approach 2:
The joint structure employs a composite configuration combining multiple adhesive layers positioned between opposing joint surfaces. This multi-layer adhesive composite structure enhances overall joint strength through cumulative bonding effects and load distribution, making adhesive joining sufficiently strong for optical device applications.
3Ease of manufacture
If joint surfaces are parallel to the plane perpendicular to the optical axis, then the joining process is simplified, but the joint area is insufficient for reduced diameter devices
Solution Approach 1:
Instead of relying solely on joint surfaces parallel to the plane perpendicular to the optical axis, the invention introduces joint surfaces that extend along the optical axis direction. The first and second joint surfaces are formed on opposing sides perpendicular to the optical axis, with intermediate surfaces connecting them, thereby increasing joint area by utilizing the longitudinal dimension of the device.
Solution Approach 2:
The joint area is segmented into multiple discrete bonding interfaces along the optical axis: first joint surface, intermediate joint surface(s), and second joint surface. Each segment contributes to the total joint area, and the segmented structure allows for simplified manufacturing of each individual interface while achieving cumulative large-scale bonding area.
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 ensures secure joint strength even at reduced diameters, suppresses relative positional shifts between optical components, and allows for efficient UV adhesive curing without interference, thereby maintaining optical performance.
Implementation Method 1
a holder (150) to hold the optical element (140), and a adhesive (170) to join the holding member (120) to the holder (150)
Implementation Method 2
allows for efficient UV adhesive curing without interference
Data Source
AI summary
An optical device includes a light guide member, a holding member to hold the light guide member, an optical element to function according to light applied from the light guide member, a holder to hold the optical element, and an adhesive to join the holding member to the holder. The holding member and the holder are engaged with each other so that the optical element is placed on an optical axis of the light guide member. At least one of the holding member and the holder has a joint structure extending along the light guide member. The joint structure forms a gap to allow the adhesive to be easily injected between the holding member and the holder. The holding member and the holder are joined to each other with the adhesive injected into the gap.