Dip-Coating Segmented Multifocal Lens Inclined Orientation
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Solution Overview
Problem
Conventional dip-coating methods for segmented multifocal lenses result in obtrusive drip lines and coating thickness variations, leading to aesthetic issues and potential cracks during curing.
Innovation Solution
A method involving the lens being inclined between vertical and horizontal positions during immersion and withdrawal in the coating solution, with specific parameters for speed, viscosity, and angle to elongate the drip line and reduce its obtrusiveness, while maintaining adequate coating thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens is withdrawn vertically from the coating solution bath, then the coating process is simple and convenient, but a drip line with a large drop-shaped head forms close to the segment in the vision area
Solution Approach 1:
The lens is inclined at a specific angle (between 0° and 90°) relative to the vertical direction during withdrawal from the coating solution bath. This angular inclination moves the drop-shaped head of the drip line from the vision area to a non-vision area, effectively relocating the defect to an acceptable position without compromising the simplicity of the dip-coating process
2Object-affected harmful factors
If the lens is tipped from vertical to horizontal position during withdrawal to prevent drip line, then the drip line is prevented, but the coating thickness becomes too thick and varies between top and bottom of the lens
Solution Approach 1:
Instead of tipping the lens to a horizontal position, the invention optimizes the withdrawal parameters by maintaining a specific angular inclination (between 0° and 90° relative to vertical) and controlling the withdrawal speed (1-10 mm/s). This parameter optimization achieves both drip line prevention and uniform coating thickness without requiring extreme positional changes
3Manufacturing precision
If the lens is inclined to an inclined position during immersion and withdrawal, then the drip line is elongated and moved to non-vision area with reduced thickness variation, but the process complexity increases
Solution Approach 1:
The invention employs dynamic control of the lens orientation during the dip-coating process. The lens is inclined at a specific angle (between 0° and 90° relative to vertical) during both immersion and withdrawal phases, and this angular position can be adjusted based on the segment characteristics. This dynamic positioning approach achieves precise control over drip line formation and coating uniformity without requiring overly complex equipment
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 method effectively moves the drip line out of the vision area and ensures uniform coating thickness, preventing cracks and enhancing the lens's abrasion resistance without being obtrusive.
Implementation Method 1
the coating on the coated-lens is cured... increase the abrasion resistance of the lens
Implementation Method 2
the drip line comprises an elongated portion the end of which is in the form of a drop-shaped head... the drop-shaped head is thus moved away from the segment
Data Source
AI summary
A method of dip-coating a segmented multifocal lens (1) having a segment with a curved portion and a straight line portion, includes the steps of: placing the lens (1) on a basket support (21); immersing the lens (1) vertically in a coating solution bath (16); and withdrawing the lens (1) vertically from the bath (16); wherein the step of placing the lens (1) is performed such that the straight line portion of the lens (1) is in a vertical plane; and wherein, before or during the step of immersing the lens (1), the lens (1) is inclined to an inclined position between a vertical position and a horizontal position of the lens (1), in which inclined position the segment is downwardly inclined and the straight line portion of the segment remains in the vertical plane.