Separate Overcoat Layers for Light-Guiding Device Uniformity
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Solution Overview
Problem
The existing light-guiding devices that enable see-through viewing face issues with forming hard coat layers, such as liquid pooling and uneven thickness, especially when the resin base material is oriented in certain ways, leading to poor appearance and decreased yield.
Innovation Solution
A light-guiding device with separate overcoat layers on either side of the central member, which helps in symmetrical manufacturing of hard coat layers, preventing liquid pooling and ensuring uniform thickness by maintaining the positioning accuracy and avoiding the positioning locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the resin base material is oriented in landscape state for hard coat layer formation, then the surface area when leaving the liquid increases, but liquid pooling occurs at the underportion causing whitening and poor appearance
Solution Approach 1:
The patent applies asymmetry by providing separate overcoat layers at different positions relative to the central member. The first overcoat layer is provided at a first position and the second overcoat layer is provided at a second position, creating an asymmetric configuration that prevents liquid pooling during the coating process while maintaining adequate surface area coverage.
2Manufacturing precision
If the resin base material is oriented in portrait state for hard coat layer formation, then the surface area is reduced, but the hard coat liquid concentrates at the throttle portion causing sagging near the center portion
Solution Approach 1:
The patent applies local quality by providing overcoat layers at specific localized positions rather than uniformly across the entire surface. The first overcoat layer is positioned at a first location and the second overcoat layer is positioned at a second location, allowing targeted coverage that prevents concentration and sagging while maintaining necessary surface protection.
3Adaptability or versatility
If steps are provided at the light-guiding member, then structural functionality is enhanced, but the orientation of corresponding steps is reversed in paired members causing whitening and non-uniformity in hard coat layer
Solution Approach 1:
The patent applies segmentation by dividing the overcoat structure into separate first and second overcoat layers positioned at different locations. This segmentation allows each layer to be independently positioned to account for the reversed step orientations in paired light-guiding members, preventing whitening and non-uniformity while maintaining structural functionality.
Data Source
AI summary
A light-guiding device includes a pair of light-guiding portions, a pair of light-incident portions that causes image light to be incident on the pair of light-guiding portions respectively, and a pair of light-emitting portions that emit image light, guided by the pair of light-guiding portions, to outside respectively, in which a pair of optical members including the pair of light-guiding portions are coupled by a central member having light transmissivity, and separate overcoat layers are provided at the optical member on one side and at the optical member on another side with respect to an approximate center of the central member.