Lens Module Vane Fastening for Vehicle Imaging Creep
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Solution Overview
Problem
Imaging apparatuses installed in vehicles face issues with lens focus shifting due to temperature changes and deformation, leading to decreased resolution caused by continuous load application and creep phenomena during fastening, which alters the distance between the lens and imaging element.
Innovation Solution
The imaging apparatus incorporates a lens module with vane members that have through-holes for fastening, allowing the lens module to be fixed to the case without passing fastening members through the main body, thereby preventing continuous load application and deformation in the direction of the optical axis, and using an adhesive to fix the base to the lens module, maintaining the pre-adjusted position and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lens module is fastened to the case using a fastening member threaded through a through-hole in the base, then the lens module can be fixed to the case, but a continuous load is applied to the base member in the direction of the optical axis causing creep deformation and changing the distance between the lens and imaging element
Solution Approach 1:
The patent divides the fastening function into two separate components: the vane member provides mechanical fastening through through-holes, while the adhesive provides continuous support and load distribution. This segmentation prevents concentrated stress on the base member that would cause creep deformation.
Solution Approach 2:
The adhesive acts as an intermediary between the lens module and case, distributing the fastening load across a larger area and preventing direct transmission of continuous axial load through the base member, thereby preventing creep deformation.
2Ease of operation
If a through-hole enabling threading of the fastening member is provided on the base of the lens module in the same direction as the optical axis, then the lens module can be fixed to the case, but deformation such as contraction of the base member occurs due to creep phenomenon
Solution Approach 1:
The fastening system is segmented into mechanical fastening (through vane member) and chemical bonding (adhesive), distributing stress away from the base member to maintain its shape stability while preserving ease of assembly.
Solution Approach 2:
The adhesive is applied in advance to the fastening location, creating a preliminary bond that distributes load before the fastening member is fully tightened, preventing creep deformation during the fastening process.
3Duration of action of stationary object
If the lens module is fixed with constant deformation applied to the base member, then the base member contracts due to creep phenomenon, but the distance between lens and imaging element changes causing defocus
Solution Approach 1:
The adhesive serves as a load-distributing intermediary that prevents continuous axial stress from being transmitted through the base member over time, eliminating the creep phenomenon that would cause focus drift during extended operation.
Solution Approach 2:
By segmenting the fastening load between the vane member structure and adhesive bonding, the base member is protected from continuous deformation, maintaining both long-term stability and focus precision.
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
This configuration effectively suppresses changes in the distance between the lens and imaging element, preventing focus shift and deformation, thus maintaining image resolution and preventing tilting and size increase of the case, while also using a material like polyphenylene sulfide to reduce creep phenomena.
Implementation Method 1
using an adhesive to fix the base to the lens module, maintaining the pre-adjusted position and orientation
Implementation Method 2
using a material like polyphenylene sulfide to reduce creep phenomena
Data Source
AI summary
An imaging apparatus provided with a lens module which has a main body and two vane members. The main body holds a lens on an inside thereof. The vane members are plate shaped sections projected from an outside surface of the main body, which are provided with through-holes enabling fastening members to be threaded through. A base is provided with an imaging element and configured to fix thereto the main body. The case which accommodates the lens, the lens module and the base has two thread-holes formed on an inside thereof, into which the fastening members are fastened thereto. The lens module is fixed to the case by threading the fastening members through the through-holes, and fastening the fastening members into the thread-holes.