Input Device Using Self-Mixing Interferometry Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch-sensitive devices require a touch-sensitive surface for precise input, limiting the functionality of input devices like active styli, which can only generate content on surfaces equipped with such technology.
Innovation Solution
The integration of self-mixing interferometry (SMI) sensors in input devices allows for the detection of position, orientation, motion, and force applied by the input device, enabling content generation without a touch-sensitive surface, using additional sensors for processing textual and three-dimensional object inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active styli are used to generate content, then input precision is improved, but the requirement for touch-sensitive surfaces increases device complexity and limits versatility
Solution Approach 1:
The patent introduces an intermediary optical system consisting of light sources, mirrors, and detectors that mediate between the stylus and the surface. This optical intermediary enables precise measurement of stylus position and orientation through light reflection patterns, allowing the stylus to function on any reflective surface without requiring specialized touch-sensitive infrastructure.
Solution Approach 2:
The patent replaces mechanical touch-sensitive surface systems with an optical measurement system. Instead of relying on electrical or mechanical sensors embedded in the surface, the system uses optical fields and light reflection properties to detect stylus characteristics, thereby eliminating the need for complex touch-sensitive surfaces while maintaining measurement precision.
2Ease of operation
If touch-sensitive surfaces are used to enable precise input, then input functionality is improved, but the cost and complexity of the system increases
Solution Approach 1:
The optical system acts as an intermediary that simplifies the overall system architecture. Rather than embedding complex sensors throughout the surface, the patent uses a portable stylus with integrated optical components that can be used with any reflective surface, thereby reducing system complexity while maintaining ease of operation.
Solution Approach 2:
The stylus itself performs the sensing function through its integrated optical components. The light sources, mirrors, and detectors within the stylus enable it to self-determine its position, orientation, and motion relative to the surface, eliminating the need for external sensing infrastructure and reducing overall system complexity.
3Adaptability or versatility
If SMI sensors are integrated in the input device, then versatility across different surfaces is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple optical components (light sources, mirrors, detectors) into an integrated self-mixing interferometry sensor system within the stylus. This consolidation achieves versatile surface compatibility through unified optical measurement capabilities while managing device complexity through integrated design and shared optical pathways.
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 precise content generation on both touch-sensitive and non-touch-sensitive surfaces, enhancing the versatility and precision of input devices by utilizing SMI sensors to track and process input device parameters for rendering on displays.
Implementation Method 1
self-mixing interferometry (SMI) sensors that can be used to detect characteristics of the input device including position, orientation, and/or motion
Implementation Method 2
transmit light to a surface and detect the reflected light
Implementation Method 3
The processor can be configured to determine a velocity of the input device based on a frequency shift of the received light
Data Source
AI summary
Self-mixing interferometry (SMI) sensors can be used for generation of content using an input device without requiring a touch-sensitive surface. In some examples, the SMI sensors can be used to detect characteristics of the input device including position, orientation, and/or motion of the input device and/or force applied by the input device (e.g., force applied by a stylus tip). In some examples, some or all of the characteristics of the input device can be used in processing to generate content, including textual character input and three-dimensional objects. In some examples, the generation of content can use information from one or more additional sensors for the input device and/or from additional devices in combination with the characteristics of the input device based on the SMI sensors for generation of content.