Package Carrier Metal Sheet Optical Signal Blocking

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Solution Overview

Problem

Conventional optical detecting devices face issues with reduced functional sensitivity and reliability due to optical signal transmission between light emitting and receiving units, which are often addressed by using ceramic carriers that increase cost and size, or by adding metal cases that further escalate costs and dimensions.

Innovation Solution

A package carrier with a carrier substrate and a metal sheet positioned between the light emitting and receiving device areas, effectively blocking optical signals while maintaining a compact size and reducing fabrication costs through the use of plastic and metal materials formed via stamping and injection-molding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a plastic two-carrying-area carrier is used to mount both light emitting unit and receiving unit, then cost and size are reduced, but optical signal transmission between the units cannot be completely blocked

Engineering Contradiction:

Improvefabrication costVSAvoidfunctional sensitivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The carrier is divided into two distinct carrying areas (first and second carrying areas) separated by a partition wall, with each area dedicated to specific device types. This segmentation prevents optical signal transmission between light emitting and receiving units while maintaining a cost-effective plastic construction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A partition wall structure acts as an intermediary element between the first and second carrying areas, physically blocking optical signal transmission from light emitting units to receiving units while allowing both areas to remain integrated within a single carrier substrate.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a ceramic carrier is used to replace plastic carrier to block optical signal transmission, then optical signal blocking is improved, but fabrication cost increases

Engineering Contradiction:

Improveoptical signal blockingVSAvoidfabrication cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The carrier uses a composite structure combining plastic substrate with metal sheets integrated into the partition wall. This composite approach maintains the cost advantages of plastic manufacturing while incorporating metal's superior optical blocking properties, avoiding the need for expensive ceramic materials.

Inventive Principle:

Principle #40Composite materials

3Reliability

If metal cases are attached around each device to block optical signals, then optical signal blocking is improved, but overall size and fabrication cost increase

Engineering Contradiction:

Improveoptical signal blockingVSAvoidoverall size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The partition wall containing metal sheets serves a dual function: it acts as both the structural separator between carrying areas and the optical signal blocking barrier. This merging of functions eliminates the need for separate metal cases around each device, reducing overall size while maintaining effective optical isolation.

Inventive Principle:

Principle #5Merging (Combining)

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 blocks optical signal transmission, reduces the overall size of the package, and lowers fabrication costs compared to ceramic-based solutions, while ensuring reliable operation of the optical detecting devices.

Implementation Method 1

The metal sheet is disposed in the carrier substrate and located between the first carrying area and the second carrier area, for blocking optical signal transmission between the light emitting device and the light receiving device

Methodology Applied

Scientific EffectOptical absorption: Absorption (EM radiation)

Data Source

PatentUS8097888B2Package carrier for effectively blocking optical signal transmission between light emitting device and light receiving device

Publication Date: 2012.01.17 ELITE ADVANCED LASER CORP

AI summary

A package carrier suitable for carrying at least one light emitting device and at least one light receiving device includes a carrier substrate and a metal sheet. The carrier substrate includes a first carrying area and a second carrying area. The light emitting device is disposed in the first carrying area and the light receiving device is disposed in the second carrying area. The metal sheet is disposed in the carrier substrate and located between the first carrying area and the second carrier area, for blocking optical signal transmission between the light emitting device and the light receiving device.