Stylus Lever Deflection Optical Sensing for Pressure Response
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Solution Overview
Problem
Existing styluses with simple pressure response fail to meet the high requirements for application experiences such as painting and advanced touch operations, necessitating a new design that can enhance user interaction with touch screens.
Innovation Solution
A stylus design incorporating a refill that performs a lever deflection motion with a clamping piece as a pivot, equipped with a light emitter, light signal sensing element, and micro control unit, which generates drive signals based on pressure and posture changes to control a touch screen, allowing for varied line thicknesses and enhanced interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple pressure response mechanism is used in the stylus, then the device complexity is reduced and ease of manufacture is improved, but the application experience quality deteriorates and cannot meet high requirements for painting and advanced touch operations
Solution Approach 1:
The stylus is divided into multiple functional modules: a refill module with lever mechanism for pressure sensing, a light emitter module for generating light signals, a light sensor panel module for detecting light signal positions, and a control module for processing signals. Each module independently performs its specific function, allowing for simplified manufacturing of individual components while achieving complex overall functionality for enhanced application experience
Solution Approach 2:
A light emitter and light sensor panel are introduced as intermediary elements between the pressure application point and the touch screen. The light emitter converts pressure-induced refill position changes into light signals, and the light sensor panel converts these light signals into position information, which is then transmitted to the touch screen. This intermediary optical signal transmission mechanism enables sophisticated application experiences while keeping the physical stylus structure relatively simple
2Device complexity
If a simple pressure response mechanism is used in the stylus, then the device complexity is reduced, but the measurement precision of touch operations deteriorates and cannot provide precise position and pressure information
Solution Approach 1:
The traditional direct mechanical contact pressure sensing mechanism is replaced with an optical sensing system. The refill's mechanical deflection under pressure is converted into light signal position changes through the light emitter, which are then precisely measured by the light sensor panel. This substitution of mechanical measurement with optical measurement significantly improves measurement precision for both position and pressure while avoiding the need for complex mechanical sensing structures
Solution Approach 2:
The system changes the measurement parameter from direct mechanical pressure force to light signal position. By detecting the position of light signals emitted from different locations on the refill, the system can precisely determine both the application point position and the pressure magnitude (inferred from light signal intensity or position offset), thereby achieving high measurement precision with relatively simple device structure
3Ease of operation
If a simple pressure response mechanism is used in the stylus, then the device complexity is reduced and ease of operation is improved, but the functionality is insufficient and cannot support varied line thicknesses and advanced touch operations
Solution Approach 1:
The stylus is designed with multi-functional capabilities through its modular architecture. The same basic structure (refill, light emitter, light sensor panel) serves multiple functions: position detection, pressure sensing, and enabling varied line thickness control. The touch screen can interpret the optical signal data in different ways to achieve different functions such as line thickness variation, making the device highly adaptable while maintaining ease of operation
Solution Approach 2:
The system implements feedback by continuously monitoring the position of light signals emitted from the refill and using this information to control touch screen responses. The control module processes the light signal position information and generates corresponding control signals that enable dynamic adjustment of line thickness and other touch operation parameters, providing real-time feedback control that enhances functionality while keeping the user interface simple and easy to operate
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 more precise and intuitive touch screen interactions by translating pressure and posture changes into corresponding drive signals, enhancing the application experience by simulating real writing and painting sensations.
Implementation Method 1
a light emitter, fixed at an end portion of the refill and has a light emitting surface facing away from the refill; a light signal sensing element, on a side of the end portion of the refill and configured to sense a light beam emitted by the light emitter and to output coordinate information of a position irradiated by the light beam
Implementation Method 2
the refill is able to perform a lever deflection motion by taking the clamping piece as a pivot when it is under a pressure
Data Source
AI summary
The disclosure discloses a stylus and a human-machine interactive apparatus. The stylus includes: a body, including a refill, a housing and a clamping piece; wherein the refill can perform a lever deflection motion by taking the clamping piece as a pivot when it is under a pressure; a light emitter, fixed at an end portion of the refill and has a light emitting surface facing away from the refill; a light signal sensing element on a side of the end portion of the refill and configured to sense a light beam emitted by the light emitter and to output coordinate information of a position irradiated by the light beam; and a micro control unit configured to generate a corresponding drive signal according to the coordinate information output by the light signal sensing element and to send the drive signal to a touch screen via the refill.