Lens Barrel Adhesive Fixing with Optical Centering Adjustment
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Solution Overview
Problem
Existing methods for fixing lenses in optical apparatuses, such as projectors, often result in decentering due to poor precision in holding members, leading to deteriorated optical performance, as they rely on contact surfaces and screw adjustments which are not effective for precise centering.
Innovation Solution
A lens barrel system using a lens holding member with an adhesive to fix lenses without contact, where an adjustment lens is inserted into the holding member with the adhesive filling the clearance, and a ring-shape lens frame is used to bond the lens to the holding member through through holes, allowing for precise positioning and fixing without affecting optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact surfaces of holding members are used to fix lenses, then mechanical fixing is achieved, but decentering occurs due to low precision
Solution Approach 1:
The patent replaces the mechanical contact-based fixing system with an optical feedback system. A projection device projects a reference pattern that is imaged by the lens onto a screen, allowing optical measurement and adjustment of lens centering accuracy without relying on mechanical contact precision between holding members.
Solution Approach 2:
The patent implements a feedback mechanism where the projected reference pattern and its image through the lens provide visual information about lens centering. This feedback loop allows for real-time adjustment and verification of lens position, compensating for imperfections in the mechanical holding members.
2Ease of operation
If screws are used to adjust lens position, then temporary fixing is achieved, but lens position shifts during adjustment
Solution Approach 1:
The patent replaces the screw-based mechanical adjustment system with an optical adjustment method. The projection device and imaging system allow for precise visual determination of lens centering, eliminating the need for iterative screw adjustments that cause position shifts.
Solution Approach 2:
The system allows the lens to self-align based on the optical feedback from the projected pattern. By observing the position of the projected pattern through the lens, the lens position can be directly adjusted to the correct centering without external mechanical intervention that might cause shifting.
3Device complexity
If holding members with poor precision are used, then device complexity is reduced, but optical performance deteriorates
Solution Approach 1:
The patent replaces complex high-precision mechanical holding members with a simpler system that uses projection and imaging for alignment. This substitution maintains or improves optical performance while reducing the manufacturing precision requirements of the holding members themselves.
Solution Approach 2:
The patent introduces a projection device and screen as intermediary elements between the lens and the observer/adjuster. This intermediary system provides the reference information needed for accurate lens centering without requiring the holding members themselves to be highly precise.
Data Source
AI summary
A third holding barrel is set to a stationary work holder, and a lens frame holding an eighth lens group is set to a movable work holder. The movable work holder is moved to insert the lens frame inside the third holding barrel. In this state, a chart image through the eighth lens group is projected on a screen. While checking the center and clarity of the projected image on the screen, position of the eighth lens group is adjusted. After the position adjustment, an adhesive is injected through openings of the third holding barrel by an injector, thereby fixing the lens frame to the third holding barrel.