Radiographic Imaging Panel Layout for Noise-Safe Board Connection
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Solution Overview
Problem
Radiation imaging devices suffer from noise interference due to power supply and interface circuits, leading to deteriorated image quality and increased dimensions, particularly when the control and circuit boards are arranged side by side in a plan view.
Innovation Solution
The device design includes a configuration where the control board and circuit board are arranged orthogonally to the sensor panel, with communication holes positioned to avoid overlapping the flexible printed circuit, and connection members are used to connect the boards without overlapping the flexible printed circuit, thereby reducing noise propagation and device dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control board and circuit board are arranged side by side in the planar direction, then the device dimensions in plan view increase, but this arrangement facilitates signal transmission between boards
Solution Approach 1:
The patent transitions from a planar side-by-side arrangement to a three-dimensional stacked arrangement where the control board and circuit board are positioned at different heights along the vertical direction. This dimensional change allows both boards to be compactly arranged without increasing planar footprint, while maintaining signal transmission capability through vertical connection members that penetrate the housing wall.
2Ease of operation
If communication holes are provided in the housing wall for cable passage, then electrical connection between boards is enabled, but noise from power supply and interface circuits propagates to the flexible printed circuit
Solution Approach 1:
The patent applies local quality by creating a noise-free zone around the flexible printed circuit. The communication holes are strategically positioned away from the flexible printed circuit's location, and a noise shielding structure is selectively applied only in the region where the flexible printed circuit passes through the housing, without affecting other areas of the device.
Solution Approach 2:
The patent introduces a noise shielding structure as an intermediary element between the noise-generating circuits (power supply and interface circuits) and the flexible printed circuit. This shielding structure blocks electromagnetic noise from propagating through the housing wall to the flexible printed circuit, while allowing electrical connection to be maintained through the communication holes at other locations.
3Reliability
If noise shielding structures are added around communication holes, then noise propagation is suppressed, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the noise shielding function from the overall housing structure and implements it as a separate, localized component. Instead of making the entire housing complex with integrated shielding throughout, only the specific region where the flexible printed circuit passes through is equipped with noise shielding, simplifying manufacturing while maintaining reliability.
Data Source
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AI summary
A radiation imaging device according to an embodiment includes a sensor panel, a control board, a flexible printed circuit that connects the sensor panel and a back surface of the control board through a side of the control board, a circuit board on which a power supply circuit and an interface circuit are mounted, a first housing that houses the sensor panel, the control board, and the flexible printed circuit, a second housing that houses the circuit board, and a connection member that electrically connects the control board and the circuit board. A communication hole provided in the wall portion of the first housing is provided so as not to overlap with a portion of the flexible printed circuit from the end farthest from the control board in the second direction to the end connected to the control board when viewed from the first direction.