Remote Control Receiver Isolation for Video Projectors

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Solution Overview

Problem

Infrared noise interference between multiple signal reception units in a video projector causes erroneous remote control operations, as the units share a continuous space allowing infrared noise to transmit between them, leading to unintended operation interference.

Innovation Solution

A transmission barrier is introduced to prevent infrared noise from being transmitted between signal reception units by using independent light reception windows and a cover member with a partition wall to isolate light reception elements on a shared circuit board, ensuring that infrared noise is attenuated and not transferred between units.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If multiple signal reception units are arranged in a continuous space to enable remote control from multiple directions, then the ease of operation is improved, but infrared noise interference occurs between units causing erroneous operations

Engineering Contradiction:

Improveremote control operation from multiple directionsVSAvoidinfrared noise interference

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The housing is divided into multiple light reception chambers, each containing a signal reception unit. The partition walls separate these chambers to prevent infrared noise from one unit from reaching other units, while each chamber maintains its own independent light reception space for accurate signal detection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Partition walls serve as intermediary structures between adjacent light reception chambers. These walls physically block the transmission of infrared noise between chambers while allowing each chamber to independently receive infrared signals from remote controllers through its own light reception window.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If light reception elements are mounted on a shared circuit board to reduce device complexity, then the device complexity is reduced, but infrared noise can be transmitted between signal reception units

Engineering Contradiction:

Improvenumber of circuit boards and cablesVSAvoidinfrared noise transmission

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

While keeping the circuit board shared and integrated, the housing is segmented into separate light reception chambers that physically isolate the light reception elements from each other. This segmentation prevents infrared noise transmission between units while maintaining the simplicity of a shared circuit board architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each light reception chamber provides a locally isolated environment for its respective light reception element. The partition walls create localized zones that prevent infrared noise from adjacent chambers from reaching each element, while the shared circuit board provides common signal processing functionality.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If signal reception units are arranged on the same housing surface to harmonize with design, then the ease of manufacture is improved, but infrared noise interference between units increases

Engineering Contradiction:

Improvearrangement of signal reception unitsVSAvoidinfrared noise interference

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The housing surface is divided into separate light reception chambers by partition walls. Each chamber can be positioned at different locations on the housing (front, upper, etc.) to harmonize with the design, while the partition walls ensure that infrared noise from one chamber does not interfere with other chambers.

Inventive Principle:

Principle #1Segmentation

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 prevents infrared noise interference, ensuring accurate remote control operations from multiple directions without unintended operation errors, even when the projector is installed in various orientations.

Implementation Method 1

a light reception element 32, 42 arranged in the housing 10 facing toward the light reception window 31, 41

Methodology Applied

Scientific EffectInfrared radiation detection: Photoelectric Effect

Implementation Method 2

A transmission barrier prevents infrared noise entering the housing 10 through the light reception window 31, 41 of one of the signal reception units 3, 4 from being transmitted to the light reception element 32, 42 of another one of the signal reception units 3, 4

Methodology Applied

Scientific EffectInfrared radiation blocking: Absorption (EM radiation)

Data Source

PatentUS8981923B2Remote control signal receiver and electronic device

Publication Date: 2015.03.17 PANASONIC PROJECTOR & DISPLAY CORPORATION

AI summary

A remote control signal receiver includes a plurality of signal reception units. Each signal reception unit includes a light reception window arranged in a housing of an electronic device and a light reception element arranged in the housing facing toward the light reception window. The light reception elements of the signal reception units are mounted on a circuit board. A transmission barrier prevents infrared noise entering the housing through the light reception window of one of the signal reception units from being transmitted to the light reception element of another one of the signal reception units.