Pointing Device Signal Compensation for Accurate Click Detection
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Solution Overview
Problem
Conventional pointing devices, such as mice, require users to move their hands away from the keyboard to operate, are unsuitable for limited spaces, and suffer from inaccurate click detection due to sensor placement, leading to increased complexity and height, which compromises ergonomics and usability.
Innovation Solution
A pointing device with a control device that includes a movable actuator cylinder and two sensors: one optically focused to the side for detecting axial and rotational movements, and another below for vertical movement detection, allowing accurate click function implementation with low build height and improved ergonomics by locating sensors outside the actuator cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical sensor is permanently mounted inside the central cylinder to physically follow vertical movement during clicking, then click detection accuracy is improved, but device complexity increases due to required openings, sensor fixation, and cable routing
Solution Approach 1:
The optical sensor is extracted from the central cylinder and relocated to the housing. This eliminates the need for openings in the cylinder, sensor fixation inside the cylinder, and cable routing through the cylinder, thereby reducing device complexity while maintaining click detection accuracy through signal compensation
2Length of stationary object
If the optical sensor is permanently located in the housing directly below the control device, then device build height is reduced and ergonomics are improved, but measurement accuracy deteriorates due to vertical movement displacing the detectable pattern from the sensor's focal point
Solution Approach 1:
A second sensor (vertical movement sensor) is added to detect the vertical position of the actuator cylinder. This feedback signal is used to dynamically adjust the focal point of the optical sensor or compensate for vertical displacement, maintaining measurement accuracy while allowing the sensor to remain in the housing for low build height
3Ease of manufacture
If the actuator cylinder is positioned higher in the device to accommodate the optical sensor below it, then sensor placement is simplified, but ergonomics deteriorate due to increased build height
Solution Approach 1:
The optical sensor is extracted from its position below the actuator cylinder and relocated to the housing. This allows the actuator cylinder to be positioned lower, reducing the device build height and improving ergonomics, while the sensor remains easily accessible in the housing
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
Enables accurate detection of user inputs with a low-profile design, eliminating false vertical cursor movements and enhancing usability by allowing the device to be positioned comfortably between the user and keyboard, addressing the limitations of existing technologies.
Implementation Method 1
an optical sensor is arranged inside the central cylinder and is permanently mounted to it. The optical sensor detects the movement of the control device in the axial and rotational directions
Implementation Method 2
at least one second sensor detects a mechanical movement of the actuator cylinder in a vertical direction
Implementation Method 3
a signal processing unit compensates for an effect of the vertical movement on a output signal of the first sensor on the basis of a output signal of the second sensor
Data Source
AI summary
A pointing device (1) for controlling a cursor on a computer monitor can include a control device (2) with two moving elements optionally in the form of an actuator cylinder (3) and a holder (7a,b). The actuator cylinder (3) is rotatable and translatably arranged relative to the holder (7a,b), and can be pushed down in a vertical direction by a user. A first sensor (8) is arranged to detect all movements and position changes of the actuator cylinder (3) and emit a first signal value (S1) to a signal processing unit (13a,b). At least one second sensor (11a-c) is arranged to detect the vertical position change of the actuator cylinder (3) and emit at least one second signal value (S2, S2a, S2b) which is proportional to the vertical position change of the actuator cylinder (3).