Molded Circuit Board Light Window for Camera Modules

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Solution Overview

Problem

Conventional molded packaging technologies for camera modules face challenges in mass production due to deformation and damage during the molding process, and they do not effectively manage stray light, which degrades imaging quality.

Innovation Solution

A camera module with a molded circuit board assembly that features a molded base with inclined surfaces to reduce friction and damage during demolding, and a light window design that minimizes stray light impact, allowing for efficient mass production and improved optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a vertical prismatic column shaped through-hole is formed in the encapsulation portion, then a light path is provided for the photosensitive chip, but the encapsulation portion deforms and damages during demolding

Engineering Contradiction:

Improvelight path structureVSAvoidencapsulation portion integrity

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent replaces the vertical prismatic column shaped through-hole with a curved surface structure. The encapsulation portion features a curved surface that provides the light path while avoiding sharp edges and corners that cause stress concentration during demolding. This curvature design allows the molding block to be detached without causing deformation or damage to the encapsulation portion.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Volume of moving object

If molded packaging technology is used to reduce camera module size, then compactness is improved, but deformation and damage occur during the molding process

Engineering Contradiction:

Improvecamera module sizeVSAvoidencapsulation portion shape accuracy

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent introduces curved surfaces in the encapsulation portion design to replace sharp geometric features. This curvature prevents stress concentration during the molding and demolding processes, thereby maintaining shape accuracy and preventing deformation while still achieving compact camera module dimensions.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent designs the encapsulation portion with pre-formed curved surfaces that are optimized for the molding process. This preliminary design consideration ensures that the encapsulation portion can be successfully molded and demolded without deformation, addressing manufacturing precision issues before actual production.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If conventional holder-type COB packaging is used, then manufacturing is simpler, but the occupied space of electronic components is larger

Engineering Contradiction:

Improvepackaging process simplicityVSAvoidcomponent occupied space

Core Design Contradiction:

Ease of manufactureVSVolume of moving object

Solution Approach 1:

The patent merges the holder function with the encapsulation portion itself. The molded base integrates both the encapsulation and support functions, eliminating the need for separate holders while reducing overall component occupied space. This integration maintains manufacturing simplicity while achieving compact dimensions.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11477354B2Camera module and molded circuit board assembly and manufacturing method thereof

Publication Date: 2022.10.18 NINGBO SUNNY OPOTECH CO LTD

AI summary

A camera module and its molded circuit board assembly and manufacturing method are disclosed, wherein the molded circuit board assembly includes a circuit board and a molded base integrally formed with the circuit board through a molding process. The molded base forms a light window disposed corresponding to a photosensitive element of the camera module, wherein the light window is configured to have a trapezoidal or to multi-stair trapezoidal shape cross section which has diameters increasing from bottom to top to facilitate demoulding, so as to prevent damage to the molded base, and to avoid stray light.