Contactless Click Sensing in a Pointing Device for Silent Operation
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Solution Overview
Problem
Conventional pointing devices suffer from ergonomic issues such as neck and shoulder pain, repetitive strain injuries, and mechanical wear due to mechanical click switches and resilient counterforce mechanisms, which are also prone to dust and noise, and have complex click sensitivity adjustments.
Innovation Solution
A pointing device with contactless click sensors and a vibration generating unit, allowing for customizable click sensitivity and feedback, eliminating the need for mechanical components and providing silent operation options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical click switches and resilient counterforce mechanisms are used, then click operation is achieved, but mechanical wear and dust accumulation occur
Solution Approach 1:
The patent replaces mechanical click switches and resilient counterforce mechanisms with a contactless sensing system using capacitive or optical sensors. The cursor navigation member is coupled to a non-mechanical actuator that interacts with a stationary sensor, eliminating physical contact and wear. This substitution resolves the contradiction by maintaining click functionality while eliminating mechanical degradation and dust accumulation.
2Reliability
If mechanical click switches are used, then click detection is achieved, but noise is generated
Solution Approach 1:
The patent eliminates mechanical click switches and replaces them with contactless sensors that detect actuator position through capacitive or optical fields. This non-mechanical detection method produces no audible noise while maintaining accurate click detection, resolving the contradiction between reliable detection and noise generation.
3Ease of operation
If resilient counterforce mechanisms are used, then click sensitivity adjustment is achieved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical resilient counterforce mechanisms with an electronic system where a sensor detects actuator position and a processor determines click events based on programmable thresholds. Click sensitivity is adjusted through software parameters rather than mechanical components, dramatically reducing device complexity while maintaining full adjustability.
4Reliability
If contactless click sensors are used, then mechanical wear is reduced, but sensor precision requirements increase
Solution Approach 1:
The patent introduces a non-mechanical actuator as an intermediary between the cursor navigation member and the stationary sensor. The actuator translates user input into positional changes that the sensor detects through capacitive or optical fields. This intermediary enables reliable contactless detection while managing the precision requirements through mechanical-to-field translation.
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
Improves operational reliability, accuracy, and user comfort by reducing mechanical wear, noise, and complexity, while allowing for customizable click sensitivity and feedback.
Implementation Method 1
The plurality of sensors include contactless click sensors for detecting deflection of the support member caused when a user depresses the cursor navigation member
Implementation Method 2
a vibration generating unit connected to the controller. The controller is configured, in response to having determined that a mouse click operation is intended by the user's depression, to send a control or drive signal to the vibration generating unit to cause generation of a vibration and a sound as a feedback to the user
Data Source
AI summary
A pointing device (200) for controlling a computer user interface is presented. The pointing device has a housing (210) with a base part (212). It also has an elongate support member (12) and an elongate cursor navigation member (14), the cursor navigation member being movably arranged for rotation about the support member and translation along the support member, the cursor navigation member further being depressible with respect to the base part. A plurality of sensors (602, 604, 610) for detecting rotation, translation and depression of the cursor navigation member is provided, as is computer interface circuitry (608) for connection to a computer. A controller (606) is connected to the plurality of sensors, the controller being configured to cause transmission of data regarding rotation, translation and depression of the cursor navigation member to the computer through the computer interface circuitry. The plurality of sensors include contactless click sensors (610) for detecting deflection of the support member (12) caused when a user depresses the cursor navigation member. The controller is configured to monitor the outputs from the contactless click sensors to detect that the detected deflection exceeds a click operation threshold value, and in response determine that a mouse click operation is intended by the user's depression and cause transmission of data representing the mouse click operation to the computer through the computer interface circuitry. The controller has a click sensitivity adjustment mode for allowing the user to configure the click operation threshold value.