Lens Holder Assembly for Adhesive-Free Decentering Adjustment
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Solution Overview
Problem
Existing methods for decentering adjustment of plastic lenses fail to provide sufficient bonding strength, leading to positional deviations due to debonding in high-temperature or low-temperature environments, and increase sliding load during adjustment, making precise positioning difficult.
Innovation Solution
A lens unit design that includes a lens holder with notch or opening for tool insertion, a pressing member, and an elastic member to press the lens against the holder, allowing for mechanical fixation without adhesive, reducing positional deviation through controlled urging forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive agent is used to bond plastic lens with low hydrophilic properties, then lens position can be fixed, but bonding strength is insufficient and debonding occurs in high-temperature or low-temperature environments
Solution Approach 1:
The patent replaces the chemical bonding system (adhesive agent) with a mechanical fixing system consisting of retaining claws and adjustment pins. The retaining claws nip the lens from both sides, while adjustment pins press against the lens through through-holes to prevent movement. This mechanical system provides reliable positional stability without relying on adhesive bonding, thereby resolving the contradiction between bonding strength and positional stability in extreme temperature environments.
Solution Approach 2:
The patent introduces an adjustable mechanical fixing system where the pressing force of the adjustment pins can be modified during decentering adjustment. By making the fixing mechanism dynamic and adjustable rather than fixed, the system can adapt to different lens positions and maintain optimal pressing force, ensuring both secure fixation and ease of adjustment.
2Reliability
If urging force of retaining claws is increased to eliminate adhesive, then lens can be mechanically fixed, but sliding load increases making fine adjustment difficult
Solution Approach 1:
The patent applies partial action by using multiple retaining claws distributed around the lens rather than one extremely strong claw. Each claw provides moderate holding force, collectively achieving reliable fixation without creating excessive localized pressure that would increase sliding load and hinder fine adjustment.
Solution Approach 2:
The adjustment pins are designed to be movable and adjustable, allowing the operator to modify the pressing force dynamically during the decentering adjustment process. This enables fine adjustment by reducing pressing force when needed, then securing the position by increasing force, resolving the contradiction between fixation reliability and adjustment precision.
3Stability of the object's composition
If adhesive bonding is used, then lens position can be maintained, but debonding occurs in extreme temperatures causing positional deviation
Solution Approach 1:
The patent replaces the temperature-sensitive adhesive bonding system with a temperature-insensitive mechanical fixing system. The retaining claws and adjustment pins provide physical constraints that do not rely on chemical bonding, which is known to fail in extreme temperature conditions. This substitution ensures both positional stability and bonding reliability across a wide temperature range.
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 design effectively maintains lens position during decentering adjustment, preventing deviation in extreme temperatures and minimizing optical surface distortion, while allowing precise adjustment without adhesive reliance.
Implementation Method 1
an elastic member configured to press the lens against the lens holder and located between the pressing member and the lens
Data Source
AI summary
A lens unit that fixes and holds a lens after the lens is moved and adjusted in parallel with a receiving surface to position the lens in an optical axis direction includes a lens holder configured to hold the lens and including the receiving surface, a pressing member configured to be fixed to the lens holder, and an elastic member configured to press the lens against the lens holder and located between the pressing member and the lens, wherein the lens holder includes an opening through which a tool for moving and adjusting the lens in parallel with the receiving surface by pressing an outer peripheral surface of the lens is inserted, and wherein a position of the lens is fixed by the pressing member and the elastic member.