Card Tray Eject Pin Geometry to Avoid Circuit Board Interference
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Solution Overview
Problem
The miniaturization and lightweighting of electronic devices lead to limited internal space, causing the eject pin to interfere with the circuit board during card ejection, resulting in difficulty in removing the card and potential scratching of the circuit board.
Innovation Solution
An electronic device design featuring a middle frame with an eject pin hole and an avoidance portion on the eject pin to prevent interference with the circuit board, ensuring a sufficient spacing and reducing wear on the circuit board during card ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the eject pin is used to eject the card tray, then the card tray can be removed, but the eject pin interferes with the circuit board during movement
Solution Approach 1:
The patent extracts the harmful part of the eject pin by creating an avoidance portion that removes the interfering section of the pin. This allows the eject pin to perform its ejection function while the avoided portion prevents contact with and damage to the circuit board during the ejection movement.
Solution Approach 2:
The avoidance portion acts as an intermediary structural feature between the eject pin and the circuit board. It mediates the interaction by providing a geometric modification that allows the eject pin to move through its full range of motion without directly contacting the circuit board, thus preventing harmful interference.
2Productivity
If the eject pin moves toward the accommodating cavity, then the card tray can be ejected, but the circuit board may be scratched
Solution Approach 1:
The avoidance portion extracts the harmful contacting surface from the eject pin structure. By removing this portion, the pin can move quickly to eject the card tray without the risk of scratching the circuit board, as the harmful surface no longer exists to cause damage during high-speed movement.
3Volume of moving object
If the internal space is reduced for miniaturization, then the device becomes more compact, but the eject pin and circuit board come closer
Solution Approach 1:
The patent applies local quality modification to the eject pin by creating an avoidance portion at the specific location where interference with the circuit board would occur. This localized geometric modification allows the overall device to be miniaturized while preventing harmful interactions in the critical region where the eject pin and circuit board are in close proximity.
Data Source
AI summary
An embodiment of this application provides an electronic device, including a middle frame, an eject pin, and a card tray assembly. A side wall of the middle frame is provided with an eject pin hole, and the eject pin is movably arranged in the eject pin hole. The card tray assembly includes a circuit board, and the middle frame surrounds to form an accommodating cavity. The eject pin hole communicates with the accommodating cavity, and the circuit board is arranged in the accommodating cavity. An avoidance portion is arranged on a periphery of an end of the eject pin facing the accommodating cavity, and the avoidance portion is configured to avoid the circuit board during movement of the eject pin toward the accommodating cavity.