Optical Sheet Protection Film Layout for Burr Containment
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Solution Overview
Problem
Existing optical function films, particularly louver films, face challenges in achieving smooth end faces during cutting, leading to the formation of holes or burrs that can scatter as foreign matter, adversely affecting the performance of image display apparatuses.
Innovation Solution
An optical sheet design featuring an optical function film with peelable protection films extending beyond its periphery, secured by an adhesive layer, to minimize the scattering of foreign matter by holding burrs and potential debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a cutting die or cutting method is used to obtain the optical sheet with predetermined size, then the optical sheet can be manufactured with specific dimensions, but the end faces of the louver film become rough with holes and burrs
Solution Approach 1:
The protection film is attached to the optical function film before cutting. This preliminary attachment creates a protective barrier that prevents the cutting process from directly damaging the optical function film's end faces, thereby reducing holes and burrs while still allowing the optical sheet to be manufactured with specific dimensions.
Solution Approach 2:
The protection film acts as an intermediary layer between the cutting die and the optical function film. During cutting, the protection film absorbs the mechanical stress and damage, protecting the underlying optical function film from direct contact with the cutting tool, thus maintaining smooth end faces.
2Reliability
If the protection film is attached to the optical function film, then the optical function film is protected from impact and contamination, but the protection film may fall off with burrs and foreign matter
Solution Approach 1:
The adhesive layer is integrated into the protection film structure, merging the protective function with the bonding function. This combination ensures that the protection film remains securely attached to the optical function film throughout the manufacturing and installation process, preventing burrs and foreign matter from falling off while maintaining protection from impact and contamination.
3Reliability
If the protection film extends beyond the periphery of the optical function film, then any burrs or foreign matter are held by the adhesive layer, but the protection film occupies additional space
Solution Approach 1:
The protection film extends beyond the periphery of the optical function film only at the edges where burrs and foreign matter are most likely to be generated during cutting. This localized extension provides effective containment of foreign matter while minimizing the additional space occupied compared to extending the protection film across the entire surface.
Data Source
AI summary
An optical sheet 1 includes an optical function film 10 and protection films 20. The optical function film 10 includes an optical function layer 11. The optical function layer 11 includes optical-element portions that are of two or more different kinds and are arrayed in one direction. The protection films 20 each include a protection layer 21 and an adhesive layer 22. The protection films 20 are peelably provided on a pair of major surfaces of the optical function film with the adhesive layer 22. The protection films 20 extend externally beyond at least a part of the periphery of the optical function film 10. In the protection films, a portion that is beyond at least the part of the periphery of the optical function film 10 includes a portion of the adhesive layer 22.