Ultrasonic Diagnostic Apparatus Dual Shield Case Structure
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Solution Overview
Problem
In ultrasonic diagnostic apparatuses, electromagnetic waves radiated from electronic circuits induce noise in internal AC wiring, leading to radiation noise leakage outside the casing, which is not effectively addressed by existing shield configurations.
Innovation Solution
A dual shield case structure is implemented, where a first inner shield case accommodates the power source circuit and a second inner shield case separately houses the internal AC wiring, effectively trapping radiation noise and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single shield case accommodates both power source circuit and AC wiring, then device complexity is reduced, but noise shielding effectiveness deteriorates
Solution Approach 1:
The shield case is divided into two separate inner shield cases: a first inner shield case for the power source circuit and a second inner shield case for the AC wiring. This segmentation isolates the AC wiring from electromagnetic radiation generated by the power source circuit, preventing noise induction while maintaining manageable device complexity through modular design.
Solution Approach 2:
The AC wiring is extracted from the general housing space and placed into a dedicated second inner shield case. This extraction removes the AC wiring from the electromagnetic environment created by electronic circuits and power source circuits, effectively preventing radiation noise from coupling into the AC wiring without significantly increasing overall device complexity.
2Volume of moving object
If apparatus main body is miniaturized, then productivity and space utilization are improved, but electromagnetic waves become more trapped and radiation noise increases
Solution Approach 1:
By segmenting the housing into dedicated shielded compartments for different circuits (power source circuit in first inner shield case, AC wiring in second inner shield case), the patent prevents electromagnetic waves from being trapped and propagating throughout the miniaturized apparatus. Each circuit is isolated in its own shielded space, eliminating the noise trapping effect that would otherwise occur in a compact unified housing.
Solution Approach 2:
The patent employs a nested shield case structure where first and second inner shield cases are installed within the housing. This nested arrangement allows multiple levels of shielding within a compact footprint, effectively containing electromagnetic radiation from electronic circuits and power source circuits while maintaining the miniaturized apparatus size.
3Ease of manufacture
If AC wiring is installed on the input side of power source circuit, then ease of manufacture is improved, but noise leakage to outside increases
Solution Approach 1:
The AC wiring is extracted into a separate second inner shield case that provides dedicated electromagnetic shielding. This extraction maintains the convenient input-side installation arrangement while preventing noise generated by the power source circuit from coupling into the AC wiring, thereby eliminating the noise leakage pathway through the external AC cable.
Solution Approach 2:
The second inner shield case acts as an intermediary barrier between the power source circuit and the AC wiring. This intermediate shielded structure prevents electromagnetic noise from the power source circuit from inducing noise in the AC wiring, blocking the noise transmission path while allowing the AC wiring to remain conveniently positioned on the input side of the power source circuit.
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
This configuration significantly suppresses noise leakage outside the casing and protects internal AC wiring from radiation noise, enhancing the shielding effectiveness while allowing for miniaturization of the apparatus.
Implementation Method 1
a first inner shield case which is installed in the housing and accommodates a power source circuit, and a second inner shield case which is a shield case which is different from the first inner shield case, is installed in the housing and accommodates internal AC wiring
Data Source
AI summary
To reduce noise which leaks to the outside in an ultrasonic diagnostic apparatus.An internal AC wiring unit 34 is composed of internal AC wiring which is installed on the input side of a power source circuit, and a shield case 38 which accommodates it. The internal AC wiring includes an inlet, a plurality of connectors, a relay substrate, and a plurality of internal AC cables. The internal AC wiring is protected from radiation noise which is generated in a casing 22 by the shield case 38. Thereby, the noise which leaks to the outside via an external AC cable is reduced.