Spectacle Lens Hole Angle Calculation for Pantoscopic Adjustment
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Solution Overview
Problem
Conventional spectacle lens processing devices face difficulties in accurately forming holes that account for the pantoscopic angle, leading to challenges in aligning the line of sight and optical axis, which affects user vision.
Innovation Solution
A spectacle lens processing device with a control unit that acquires the pantoscopic angle and determines the relative angle between the drilling tool and the lens, allowing for precise hole formation by adjusting the drilling tool's position based on the acquired pantoscopic angle and lens holding shaft angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hole angle is determined based only on the lens shape (surface angle), then the processing is simple, but the pantoscopic angle cannot be adjusted and the line of sight and optical axis cannot be properly aligned
Solution Approach 1:
The system changes the parameter basis for hole angle determination from solely lens surface geometry to a composite calculation incorporating both lens surface angle and pantoscopic angle. The control unit computes the hole angle by combining these two parameters, enabling both operational simplicity and proper alignment of line of sight with optical axis.
2Manufacturing precision
If the hole angle is set freely by the operator, then the pantoscopic angle can be taken into account, but the setting procedure becomes complex and difficult to operate
Solution Approach 1:
The system performs self-service by automatically calculating the appropriate hole angle based on input parameters (lens shape and desired pantoscopic angle). The control unit executes the computation without requiring the operator to manually determine complex angular relationships, thereby maintaining precision while simplifying operation.
Solution Approach 2:
The control unit acts as an intermediary between the operator's requirements and the processing parameters. It receives input about desired pantoscopic adjustment and lens geometry, then computes and outputs the precise hole angle, mediating the complex relationship between these parameters without exposing the operator to the complexity.
3Adaptability or versatility
If the lens is held by the lens holding shaft at a position other than the optic center, then the angle of the held lens changes, but it becomes difficult to form the hole at the target angle
Solution Approach 1:
The system incorporates feedback by measuring the actual angle of the held lens using a lens shape measurement unit, then using this measured angle as input to the control unit's calculation. The control unit computes the hole angle based on the actual held lens angle and desired pantoscopic angle, compensating for any deviation from optic center holding and maintaining hole angle accuracy.
Data Source
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AI summary
A spectacle lens processing device includes a control unit that controls processing. The control unit acquires a position of a hole formed in a lens and a pantoscopic angle. The pantoscopic angle is an angle in a vertical plane between a visual axis of a user and an optical axis of the lens when the user wears spectacles in which the lens after processing is mounted and faces forward. The control unit determines, based on the acquired pantoscopic angle, a relative angle between a drilling tool and the lens when the hole is formed in the lens in the acquired position of the hole.