Amending Circuit for Mouse Pin Sharing and Voltage Stability
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Solution Overview
Problem
Conventional mouse internal control circuits face instability in reference voltages for buttons and rollers due to shared pins, leading to inaccurate control circuit design and unknown loading resistances, which affects the precision of signal detection.
Innovation Solution
An amending circuit that includes a comparing unit, a predetermined voltage generating unit, a roller switch, a light emitting unit switch, and a controlling unit, allowing the mouse to switch between detecting modes by driving current through pins and using resistive voltage division to determine the detecting mode, thereby automatically adjusting reference voltages for accurate signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single pin is shared among the button, roller and indicating light source to decrease pin amounts and economize material cost, then the quantity of pins is reduced, but the reference voltages of the roller and button become unstable and cannot accurately design the related control circuit
Solution Approach 1:
The patent implements dynamic switching between different detecting modes (roller detecting mode, button detecting mode, indicating light mode) through a controlling unit that activates different circuits at different times. This dynamic approach allows the same physical pin to serve multiple functions without voltage conflict, as each mode is activated only when needed. The switching mechanism ensures that reference voltages remain stable within each specific mode while enabling pin sharing across modes.
Solution Approach 2:
The patent employs periodic switching between different detecting modes, where the controlling unit alternates between roller detecting mode, button detecting mode, and indicating light mode. This periodic action allows the shared pin to be used for different purposes at different time intervals, with each mode being activated for a specific duration. The time-division multiplexing approach ensures that reference voltages remain stable during each periodic phase while achieving overall pin reduction.
2Quantity of substance
If the single pin is shared among multiple components, then material cost is economized, but the loading resistance of the indicating light source becomes an unknown value affecting detection accuracy
Solution Approach 1:
The patent dynamically switches between indicating light mode and other detecting modes, ensuring that the indicating light circuit is only active when needed. During indicating light mode, the light emitting unit is driven by a current source with known characteristics. When switching to roller or button detecting modes, the indicating light circuit is deactivated. This dynamic isolation eliminates the uncertainty of loading resistance affecting other detection functions, as each mode operates independently with known parameters.
3Quantity of substance
If reference voltages are unstable due to shared pins, then pin quantity is reduced, but the ability to accurately detect roller and button states deteriorates
Solution Approach 1:
The patent implements dynamic mode switching that isolates different detection circuits in time, ensuring that each detection function operates with stable reference voltages when activated. The controlling unit switches between roller detecting mode, button detecting mode, and indicating light mode, ensuring that only one mode is active at a time. This dynamic isolation maintains detection reliability while achieving pin sharing, as each mode's reference voltages remain stable during its active period without interference from other circuits.
Solution Approach 2:
The patent segments the detection functions into distinct time periods, with each function (roller detection, button detection, indicating light) being activated in separate time slots. The controlling unit divides the operational timeline into segments corresponding to different detecting modes, ensuring that reference voltages remain stable within each segment. This temporal segmentation allows pin sharing while maintaining the reliability of each individual detection function within its designated time segment.
Data Source
AI summary
An amending circuit includes a comparing unit, a predetermined voltage generating unit, a roller switch, alight emitting unit switch and a controlling unit. A pin of the mouse and the predetermined voltage generating unit are respectively connected to two input terminals of the comparing unit. The controlling unit is coupled to the light emitting unit switch and the roller switch. The controlling unit switches to a motion detecting mode to drive a current of the current source to flow toward a second pin via the first pin and a light emitting unit of the mouse. The controlling unit further switches to a roller detecting mode to set a pressure of the first pin lower than a predetermined voltage of the predetermined voltage generating unit while the roller is grounded or to set the first pin higher than the predetermined voltage while the roller is not grounded.