Puck-Based Pointing Device with Tilt Mechanism for Precision Control
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Solution Overview
Problem
Current pointing devices for portable and hand-held computers, such as the Synaptics TouchPad and IBM TrackPoint, lack precision and fail to provide intuitive, accurate cursor control, especially in limited workspaces, and do not offer the additional input functions like buttons found in conventional mice.
Innovation Solution
A pointing device with a puck that moves in a defined field and includes a tilt mechanism and clickers, using electrodes to detect position and tilt, emulating multiple switches to provide precise cursor control and additional input functions, similar to those of a conventional mouse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional mouse is used for portable and hand-held computers, then precise cursor control can be achieved, but the device cannot fit within the limited workspace and form factor of portable devices
Solution Approach 1:
The patent embeds the pointing device functionality within the keyboard structure itself. The puck moves on the keyboard surface, and the sensing electrodes are integrated into the keyboard substrate, nesting the pointing device within the existing form factor of the portable computer without requiring additional external space.
Solution Approach 2:
The keyboard serves multiple functions: it acts as both the input interface for text and as the base for the pointing device. The puck can move across the keyboard surface to control the cursor, while the same keyboard structure provides the workspace, eliminating the need for a separate dedicated pointing device area.
2Area of stationary object
If a TrackPoint button is used for pointing, then the device can fit in limited workspace, but cursor positioning accuracy is significantly reduced due to velocity control instead of position control
Solution Approach 1:
The patent replaces the mechanical velocity-control mechanism of the TrackPoint with an electrostatic sensing system. Capacitive electrodes detect the position of the puck directly, providing position-controlled cursor movement rather than velocity-controlled movement. This allows precise cursor positioning even within the limited keyboard workspace.
3Area of stationary object
If a TouchPad is used for pointing, then the device can operate in limited workspace, but measurement precision is reduced due to difficulty in measuring capacitive changes from user finger
Solution Approach 1:
Instead of measuring capacitive changes introduced by the user's finger on a passive surface (as in TouchPad), the patent uses a主动 puck that contains its own electrode. The sensing system measures the position of this active electrode relative to fixed electrodes on the keyboard, inverting the traditional capacitive sensing approach to achieve higher precision.
Solution Approach 2:
The patent changes the measurement parameter from detecting capacitive changes caused by finger contact (which varies with contact area and pressure) to measuring the position of a controlled puck with a fixed electrode. This parameter change eliminates the variability introduced by different finger contact conditions and provides consistent, precise measurements.
4Adaptability or versatility
If additional buttons and input functions are added to the pointing device, then input versatility is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines multiple input functions into the single puck structure. The puck serves as both the pointing mechanism and the button input device. By detecting different positions and states of the same puck, the system provides both cursor control and multiple button functions, merging what would traditionally require separate components.
Solution Approach 2:
The puck is designed to provide multiple functions: it controls cursor movement through its position on the keyboard and provides button inputs through its interaction with clickers. This multi-functional design eliminates the need for separate buttons while maintaining input versatility, reducing overall device complexity.
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 device offers improved precision and intuitive operation, allowing for accurate cursor movement and additional input functions, enhancing usability in constrained environments while maintaining low cost and low power consumption.
Implementation Method 1
The position detector includes a circuit that measures the capacitances between the first and second electrodes and the first and third electrodes
Implementation Method 2
The moveable puck has a first member and a second member that are spaced apart from one another by a resilient spacer when no force is applied between the first and second members
Data Source
AI summary
A pointing device having a puck that is confined to move in a field of motion on a surface and that provides pointing and clicking functions analogous to those of a conventional mouse is disclosed. The puck has first and second members that are spaced apart from one another by a resilient spacer when no force is applied between the members. The puck includes a tilt mechanism for allowing the first and second members to assume a tilted configuration with respect to one another in response to a force being applied between the first and second members. A position detector determines the position of the puck in the puck field of motion and a tilt position of the first member with respect to the second member. The determined tilt position is used to emulate two or more switches that are actuated by varying the tilt position.