Camera Module Molding Assembly with Obtuse-Angle Pad Regions
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Solution Overview
Problem
Conventional auto focus camera modules face issues with miniaturization due to the obstruction and uneven flow of molding fluid caused by square pad regions, leading to incomplete injection molding and poor contact of electronic components.
Innovation Solution
Redesigning the pad regions with an avoidance boundary forming an angle greater than 90°, incorporating buffer flow channels to facilitate smooth molding fluid flow, reducing obstruction and uneven flow rates, and ensuring proper connection to actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If square pad regions are used to fit the molding region corners, then the pad regions can be properly positioned for electrical connection, but the molding fluid encounters obstruction and uneven flow at the concave apex angles
Solution Approach 1:
The pad region is redesigned from a square shape with right-angle corners to an asymmetric shape with an avoidance boundary that has an obtuse angle (greater than 90 degrees). This asymmetric design eliminates the concave apex angles that caused molding fluid obstruction, allowing smooth flow while maintaining proper electrical connection positioning.
2Volume of moving object
If the molding region is minimized for miniaturization, then the camera module size is reduced, but the molding fluid flow becomes uneven and incomplete at the pad region boundaries
Solution Approach 1:
The avoidance boundary is specifically designed at the corner region where the molding region meets the pad region, creating a localized geometric modification. This local quality change (obtuse angle instead of right angle) addresses the flow uniformity issue specifically at the problematic boundary area without affecting the overall miniaturization of the camera module.
3Area of stationary object
If the molding fluid flows continuously at right angles at the concave apex angles, then the molding region can be fully covered, but backflow and uneven flow rate occur
Solution Approach 1:
The avoidance boundary replaces the sharp right-angle corner with a curved or rounded transition (obtuse angle), eliminating the need for the molding fluid to make abrupt 90-degree turns. This curved geometry allows continuous flow coverage of the molding region while preventing backflow and maintaining uniform flow rate through smooth directional transition.
Data Source
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AI summary
A molded assembly, a camera module, a jointed board of molded assembly, and a manufacturing method are provided. The molded assembly includes a circuit board and a molded portion, wherein the circuit board has a molding region, a mounting region and at least two pad regions, the molding region surrounds the mounting region, the pad regions are arranged at corners of the circuit board and located outside corresponding corners of the molding region so as to electrically connect to an actuator, and the pad region has an avoidance boundary, and an angle formed by the avoidance boundary is greater than 90 degrees; wherein the molded portion embeds the molding region, surrounds the mounting region, and has a light window, and the molded portion avoids the pad regions along the avoidance boundary so as to reduce defective rate during production.