Camera Module Shield Case With Elastic Barrel Positioning
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Solution Overview
Problem
The existing camera modules for vehicles are prone to reduced image quality due to deformation of the shield case under external forces, which affects the accuracy of the barrel member's position within the housing.
Innovation Solution
A camera module design featuring a housing with a metallic shield case and an elastic part that biases the barrel member to maintain a specified distance from the second case, utilizing an arch-shaped elastic part to control the barrel's position and absorb external forces, thereby enhancing durability and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield case is used to surround the board and fix the barrel member using spring force, then the barrel member can be positioned and supported, but the shield case may be deformed beyond its elastic limit when a large external force acts on the barrel, resulting in reduced accuracy in the position of the barrel member
Solution Approach 1:
The shield case is divided into a rigid portion and a flexible portion, with the flexible portion further segmented into multiple elastic arms. This segmentation allows different parts to perform different functions: the rigid portion provides structural support while the elastic arms absorb external forces through elastic deformation, preventing the entire shield case from deforming beyond its elastic limit.
Solution Approach 2:
The shield case's flexibility is adjusted by controlling the thickness and material properties of the flexible portion. By optimizing these parameters, the shield case can withstand external forces within its elastic limit while maintaining positioning accuracy. The elastic arms are designed with specific thickness ranges to ensure they return to their original position after deformation.
2Reliability
If the elastic part is designed to be highly flexible to absorb external forces, then durability is improved, but the control precision of the barrel member's position may be reduced
Solution Approach 1:
Different portions of the shield case have different mechanical properties: the rigid portion provides structural stability while the flexible portion with elastic arms provides force absorption. The elastic arms are designed with specific geometric features (arch shape, controlled thickness) to ensure they deform elastically under external forces but maintain sufficient stiffness to control the barrel member's position accurately.
Solution Approach 2:
The elastic arms are designed to dynamically respond to external forces by deforming within their elastic limit and then returning to their original position. This dynamic behavior allows the shield case to absorb shocks and vibrations while maintaining position control accuracy during normal operation.
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 solution effectively improves the camera module's durability against external forces and maintains high image quality by ensuring the barrel member remains at a stable distance from the second case, even under stress, thus preventing significant reductions in image accuracy.
Implementation Method 1
an elastic part that is provided to an end of the peripheral wall portion and biases the barrel member toward the opening
Implementation Method 2
the elastic part has an arch shape formed by the elastic part being bent in stages inward of the shield case from the end of the peripheral wall portion
Data Source
AI summary
A camera module includes a housing, a barrel member, a sensor board, and a metallic shield case. The housing includes a first case that includes an opening, and a second case that is joined to the first case. The barrel member is arranged in the first case, and includes a barrel that is fitted into the opening in an optical-axis direction. The sensor board is arranged in the housing and includes an imaging device that faces the barrel member. The shield case is arranged between the barrel member and the second case.