Composite Light Blocking Sheet with Distinct Surface Gloss for Orientation

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Solution Overview

Problem

Conventional light blocking sheets in imaging lens assemblies lack a clear method to identify the correct orientation, leading to ineffective stray light elimination and increased manufacturing complexities.

Innovation Solution

A composite light blocking sheet with distinct gloss levels on its surface layers, where more than 95% of the first outer surface has a first gloss (GU1) and more than 95% of the second outer surface has a second gloss (GU2), with specific conditions (0%<GU1<1.8% and 2.0%<GU2<9.0%) ensuring correct orientation identification and reduced assembly errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional light blocking sheet with uniform surface properties is used, then the structure is simple and manufacturing is easy, but the correct orientation cannot be identified leading to ineffective stray light elimination

Engineering Contradiction:
Improvestray light elimination effectivenessVSAvoidsurface structure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating different surface properties (gloss levels) at different locations on the light blocking sheet. Specifically, the object-side outer surface has a first gloss value while the image-side outer surface has a second gloss value different from the first. This local differentiation enables orientation identification while maintaining the light blocking function, resolving the contradiction between reliability and device complexity.

Inventive Principle:
Principle #3Local quality

2Manufacturing precision

If the gloss values on both surfaces are made different to enable orientation identification, then correct assembly can be ensured, but the manufacturing precision requirements increase

Engineering Contradiction:
Improvegloss value control precisionVSAvoidmanufacturing difficulty
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by specifying concrete gloss value ranges (0%≤GU1<10% and 10%<GU2≤90% or vice versa) to differentiate the two surfaces. These quantified parameter specifications provide clear manufacturing targets while ensuring orientation identification capability, balancing manufacturing precision requirements with ease of manufacture.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS11254098B2Composite light blocking sheet, imaging lens assembly and electronic device
Publication Date: 2022.02.22 LARGAN PRECISION
  • US11254098B2 patent drawing
  • US11254098B2 patent drawing
  • US11254098B2 patent drawing

AI summary

A composite light blocking sheet includes a first surface layer, a second surface layer, an inside substrate layer and a central axis. The first surface layer has a first opening and a first outer surface connected to the first opening. The second surface layer has a second opening and a second outer surface connected to the second opening. The inside substrate layer has a substrate opening and is disposed between the first surface layer and the second surface layer and connects the first surface layer and the second surface layer. The central axis is coaxial with the first opening, the second opening and the substrate opening. More than 95% of the first outer surface has a first gloss being GU1, more than 95% of the second outer surface has a second gloss being GU2, and the first gloss GU1 and the second gloss GU2 satisfy specific conditions.