Cover State Sensing via MLB Slot and Tab Obstruction
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Solution Overview
Problem
Media processing devices, such as label printers, often require sensors to detect the open or closed state of a cover, which adds cost and complexity to the devices.
Innovation Solution
A media processing device with a housing, a rotatable cover, a main logic board (MLB) supporting a controller, and a sensor assembly including a receiver and emitter affixed to the MLB. The sensor assembly uses a slot on the MLB to detect the presence or absence of a tab, indicating the cover's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is added to detect the cover state, then the cover state detection function is improved, but the device cost and complexity increase
Solution Approach 1:
The patent combines the cover state detection function with the existing main logic board by integrating an optical sensor and emitter directly into the board structure. The sensor assembly is mounted on the logic board and uses a slot in the board to detect the presence or absence of a tab, thereby merging the detection function into the existing device architecture rather than adding a separate detection system.
Solution Approach 2:
The main logic board is designed to serve multiple functions: it processes media data and simultaneously detects cover state through an integrated optical sensor assembly. The slot in the logic board serves both as a structural feature and as part of the sensing mechanism, allowing the same component to fulfill multiple roles in the device.
2Device complexity
If a sensor assembly is integrated onto the main logic board, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The optical sensor assembly is pre-integrated into the main logic board during board fabrication or assembly, rather than being added as a separate field-installable component. The slot for the tab detection is also pre-formed in the logic board structure, allowing the sensing mechanism to be ready before final device assembly. This preliminary integration reduces the complexity of final assembly while requiring precise manufacturing of the board itself.
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 simplifies the manufacturing and assembly of media processing devices by integrating the sensing mechanism directly onto the main logic board, reducing costs and complexity while effectively detecting the cover's state.
Implementation Method 1
an emitter affixed to the MLB on a second side of the slot, configured to emit radiation detectable by the receiver
Data Source
AI summary
A media processing device includes: a housing; a cover rotatable between open and closed positions; a main logic board (MLB) supporting a controller, and having a slot extending into the MLB from an open end at a perimeter of the MLB, the slot traversing the MLB from an upper surface to a lower surface; a receiver affixed to the MLB on a first side of the slot, and an emitter affixed to the MLB on a second side of the slot, to emit radiation detectable by the receiver; and a tab movably coupled to the housing, to obstruct the slot and prevent detection of the radiation by the receiver when the cover is in a first one of the open and closed positions, and to clear the slot and permit detection of the radiation by the receiver when the cover is in the other of the open and closed positions.