Noise Sensor Cover Layout for Isolating External Noise
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Solution Overview
Problem
Noise sensors installed near noise sources in image forming apparatuses detect operational noise too loudly, making it difficult to identify unusual noise, while sensors placed outside the apparatus detect external noise.
Innovation Solution
A noise sensor is positioned outside the frame, covered by an inner and exterior cover, with the inner cover designed to reflect operational noise through an opening to the sensor, reducing external noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the noise sensor is installed near the noise source, then the operational noise is detected strongly, but the operational noise is too loud making it difficult to detect unusual noise
Solution Approach 1:
The apparatus is divided into an inner space (frame) containing the noise source and an outer space where the noise sensor is located. The frame with its opening segments the space to allow controlled noise transmission while isolating the sensor from direct exposure to the noise source and external noise.
Solution Approach 2:
The opening in the frame acts as an intermediary structure that transmits operational noise from the noise source to the noise sensor while providing geometric control over the noise path. This intermediary structure enables the sensor to detect operational noise at reduced intensity while maintaining detection capability.
2Object-affected harmful factors
If the noise sensor is installed outside the apparatus, then external noise is detected, but the operational noise from the noise source is not effectively collected
Solution Approach 1:
The noise sensor is positioned in a specific location outside the frame with particular orientation toward the opening. This local positioning creates a zone where the sensor is shielded from external noise sources while remaining in the path of operational noise transmitted through the opening, achieving different noise exposure conditions at different locations.
Solution Approach 2:
The noise transmission path extends from the inner space through the opening to the outer space where the sensor is located. This spatial dimensionality change allows the sensor to be positioned outside the apparatus boundary while maintaining acoustic connection to the noise source through the opening, separating the sensor from both the noise source and external noise sources.
3Device complexity
If the noise sensor is installed near the exterior cover, then the apparatus structure is simplified, but the noise sensor detects noise outside the apparatus
Solution Approach 1:
The frame structure serves multiple functions: it supports the noise source, provides the opening for noise transmission, and acts as a shielding structure to protect the noise sensor from external noise. This multi-functional design achieves noise isolation without requiring separate complex shielding structures.
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
Effectively collects operational noise while minimizing external noise interference, enhancing the ability to detect unusual noise patterns.
Implementation Method 1
the inner cover designed to reflect operational noise through an opening to the sensor
Data Source
AI summary
An electronic device includes: a noise source that produces an operational noise; a frame accommodating and supporting the noise source and having an opening leading to a space accommodating the noise source; a noise sensor that is provided outside the frame and collects noise from the noise source through the opening; a covering part covering the noise sensor and the opening at least when viewed from an outside of an apparatus; and an exterior cover that covers an outer side of the covering part.