Passive Stylus Mechanical Control for Optical Touch Detection

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Solution Overview

Problem

Existing styli for touch-sensitive devices often have limited functionality due to their single operating mode, and adding multiple modes with electronic components increases complexity, bulk, and cost, while also requiring frequent battery replacements.

Innovation Solution

A passive stylus that can switch between states by using a control mechanism such as a button, switch, or lever to disturb optical beams differently, allowing the touch system to determine its state without the need for electronic components or batteries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If additional electronics are added to the stylus to enable multiple operating modes, then functionality is improved, but device complexity increases

Engineering Contradiction:

Improvenumber of operating modesVSAvoidcomplexity of stylus

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces electronic control systems with a mechanical control mechanism. A control element (button, switch, or lever) mechanically alters the stylus tip's optical properties to enable multiple operating modes. The mechanical control changes the physical state of the tip material or structure, allowing the stylus to switch between modes without electronics, thereby improving functionality while maintaining simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If additional electronics are added to the stylus to enable multiple operating modes, then functionality is improved, but the stylus becomes bulkier

Engineering Contradiction:

Improvenumber of operating modesVSAvoidvolume of stylus

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent eliminates electronic components (circuits, batteries, processors) by using a mechanical control system. The control element mechanically modifies the optical interaction of the stylus tip with the touch screen, enabling multiple modes without adding electronic bulk. This mechanical approach maintains a compact stylus design while providing enhanced functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If additional electronics are added to the stylus to enable multiple operating modes, then functionality is improved, but manufacturing cost increases

Engineering Contradiction:

Improvenumber of operating modesVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive electronic components with simple mechanical elements (button, switch, or lever) and optical materials. The mechanical control system requires minimal manufacturing steps and uses readily available materials, significantly reducing production costs compared to electronic solutions while still enabling multiple operating modes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Adaptability or versatility

If batteries are added to the stylus to power electronic components, then multiple operating modes are enabled, but maintenance requirements increase due to frequent battery replacements

Engineering Contradiction:

Improvenumber of operating modesVSAvoidbattery replacement frequency

Core Design Contradiction:

Adaptability or versatilityVSEase of repair

Solution Approach 1:

The patent eliminates batteries by using a passive mechanical control system. The mechanical control element operates without power sources, using physical manipulation (pressing, sliding, or rotating the control) to change the stylus tip's optical state. This battery-free approach removes maintenance requirements entirely, as there are no consumable power sources to replace.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enhanced functionality and user experience by allowing multiple operating modes without adding complexity or cost, and eliminates the need for battery replacements, improving user satisfaction and device performance.

Implementation Method 1

The stylus disturbs a portion of the optical beams when in contact with the touch sensitive surface

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

Touch events disturb the optical energy transfer from emitter to detector

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 3

The stylus has a control that can change the stylus between a first state and a second state

Methodology Applied

Scientific EffectPhase change: Phase Change

Data Source

PatentUS10983611B2Stylus with a control

Publication Date: 2021.04.20 BEECHROCK LTD

AI summary

A touch sensitive surface has emitters and detectors arranged around at least a portion of a periphery of the touch sensitive surface. The emitters produce optical beams that are received by the detectors. Touch events disturb the beams propagating toward the detectors. Variations in the beams resulting from the touch events are captured and are used to determine the touch events. A stylus disturbs beams when in contact with the touch sensitive surface. The stylus includes a control that can change the stylus from a default state to an alternative state, where the stylus disturbs the beams differently in each state. A controller determines the state of the stylus based on the beams received by the detectors.