Imaging Module Frame Geometry to Prevent Mold-Friction Projections

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Solution Overview

Problem

Conventional electronic modules suffer from projections forming on the side surfaces of the frame member during manufacturing, which degrade the display image quality due to friction between the mold and the frame member, leading to poor image quality.

Innovation Solution

The electronic module design incorporates a frame member with inner wall side surfaces featuring non-parallel end faces and controlled distances between surfaces to reduce friction, preventing projections and maintaining image quality while ensuring structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the frame member has parallel end faces on the inner wall side surface, then the manufacturing process is simple, but projections form on the side surfaces due to friction with the mold, degrading display image quality

Engineering Contradiction:

Improvedisplay image qualityVSAvoidframe member structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by making the end faces of the inner wall side surface non-parallel, with at least one end face having a different angle relative to the normal line of the second surface. This asymmetric design prevents uniform friction contact between the mold and frame member during manufacturing, thereby preventing projection formation and maintaining display image quality.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent applies local quality by specifically modifying only the inner wall side surface geometry while keeping other parts of the frame member structure relatively simple. The non-parallel end faces are implemented only where needed to prevent projections, allowing the rest of the device to maintain simplicity.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If the distance between the second surface and the second line is large, then projections are prevented more effectively, but the frame member thickness increases, affecting overall module size

Engineering Contradiction:

Improveprojection preventionVSAvoidframe member thickness

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The patent applies parameter changes by optimizing the distance between the second surface and the second line to be 10% or more of the distance between the first and second surfaces. This specific parameter threshold provides sufficient space to prevent projection formation while controlling the overall thickness increase of the frame member.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12556788B2Electronic module and imaging apparatus

Publication Date: 2026.02.17 CANON KK

AI summary

An electronic module includes a first substrate and a frame member. The frame member includes a first surface and a second surface, and an inner wall side surface in contact with the first and second surfaces. The inner wall side surface includes at least a first end face and a second end face. A normal line to the second surface is a first line, and a line parallel to the second surface, passing through a point where the first end face contacts the second end face, is a second line. An angle formed by the first line and the first end face is different from an angle formed by the first line and the second end face. A distance between the second surface and the second line with respect to the second surface is larger than or equal to 10% of a distance between the first and second surfaces.