Lens Assembly Tilt Alignment via Virtual Marks
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Solution Overview
Problem
Conventional lens assembling methods struggle to accurately adjust the tilt between multiple lenses, particularly in high-pixel optical systems, leading to image distortion and blurred images due to inadequate precision in axis alignment.
Innovation Solution
A lens assembling method that uses marks on the lenses to align their positions in both parallel and tilt directions, employing virtual marks extrapolated from multiple marks on the periphery of the lenses to achieve precise alignment, allowing for the adjustment of tilt angles between lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens assembling methods are used, then the assembling process is simple, but the axis alignment precision is insufficient leading to image distortion and blurred images
Solution Approach 1:
The patent introduces marks as intermediary reference elements on the lenses and a coordinate measurement machine as an intermediary measurement tool. The marks serve as mediators between the lens surfaces and the measurement system, enabling precise coordinate detection and alignment without requiring direct complex measurement of optical axes. This intermediary approach resolves the contradiction by providing a simple yet precise method for axis alignment.
Solution Approach 2:
The patent replaces traditional mechanical alignment methods (such as frame fitting or flange positioning) with an optical measurement system using a coordinate measurement machine. Instead of relying on mechanical reference structures that require high-precision manufacturing, the system uses optical scanning and coordinate analysis to determine lens positions and orientations, thereby achieving high alignment precision without increasing mechanical complexity.
2Manufacturing precision
If optical performance measurement method is used for axis alignment, then high precision alignment can be achieved, but long time is required for the aligning work
Solution Approach 1:
The patent applies preliminary action by pre-placing marks on the lens surfaces before assembly. These marks serve as pre-prepared reference points that enable rapid coordinate measurement and alignment calculation. By preparing the measurement references in advance rather than performing optical performance measurements during the alignment process, the method achieves high precision alignment significantly faster, resolving the time-consuming issue of conventional optical measurement methods.
3Ease of operation
If mark-based alignment method is used, then axis alignment can be performed easily, but tilt adjustment between lenses cannot be precisely controlled
Solution Approach 1:
The patent transitions from two-dimensional mark position matching to three-dimensional coordinate space analysis. By measuring the spatial coordinates of marks on multiple lens surfaces and calculating alignment parameters in 3D space, the system can determine both positional offsets and tilt angles. This dimensional expansion enables precise tilt control while maintaining the ease of mark-based operation, as the coordinate measurement machine automatically computes all alignment parameters from the mark coordinates.
Data Source
AI summary
A lens assembling method for assembling a first lens and a second lens where the first lens has a first mark on a first surface thereof and a second mark on a second surface opposite to the first surface, and the second lens has a third mark on a first surface thereof, the lens assembling method including: a first step of aligning a position of one of the first mark and second marks of the first lens with a position of the third mark of the second lens; and a second step of aligning a position of the other one of the first and second marks of the first lens with the position of the third mark of the second lens, while keeping the position alignment performed in the first step.