Finger Pointing Apparatus Using Electromagnetic Wave Position Detection
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Solution Overview
Problem
Existing input devices for portable devices are often complex, expensive, and inconvenient, with limitations in detecting finger positions and movements, such as finger bend measurement devices and hand-movement-sensing input devices.
Innovation Solution
A finger pointing apparatus with pressure sensors and electromagnetic wave transmitters on the finger and receivers on the palm, which calculates coordinate values based on received electromagnetic waves to enable intuitive control of cursors, scrolling, and keyboard functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If finger bend measurement is used to detect finger position, then finger position detection is achieved, but the measurement and device become relatively complex and expensive
Solution Approach 1:
The patent replaces the mechanical finger bend measurement system with an electromagnetic wave-based detection system. Pressure sensors detect finger contact, and electromagnetic wave transmitters/receivers determine position through wave propagation time or phase differences, eliminating complex mechanical measurement mechanisms.
Solution Approach 2:
The patent introduces electromagnetic waves as an intermediary to detect finger position. Instead of directly measuring mechanical bend, the system uses electromagnetic wave transmission between transmitter and receivers to infer position, simplifying the measurement mechanism.
2Measurement precision
If hand-movement-sensing input device based on images is used, then hand position and movement detection is achieved, but the device becomes complex and hand positions are limited
Solution Approach 1:
The patent replaces image-based optical detection with electromagnetic wave transmission. The electromagnetic wave system provides direct position detection through wave propagation measurements, avoiding the complexity of image capture, processing, and analysis required by optical systems.
3Measurement precision
If existing finger position detection devices are used, then finger position detection is achieved, but the devices are expensive and inconvenient for portable use
Solution Approach 1:
The patent divides the detection system into separate functional modules: pressure sensors for contact detection, electromagnetic wave transmitters for signal emission, and receivers for signal detection. This modular segmentation allows for simplified manufacturing and integration into portable devices.
Solution Approach 2:
The patent employs relatively simple and inexpensive components such as pressure sensors and electromagnetic wave transmitters/receivers, replacing expensive specialized equipment. The system uses readily available off-the-shelf components to achieve cost-effective implementation.
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
The apparatus provides a simple, portable, and cost-effective means to control cursors, scrolling, and keyboard functions, allowing for versatile input of letters, numbers, symbols, and gestures, enhancing user interaction with devices.
Implementation Method 1
at least one pressure sensor fixed on a hand, for generating a trigger signal when pressure is produced by a finger contacting an external object
Implementation Method 2
at least one electromagnetic wave transmitter corresponding to the pressure sensor, connecting with the pressure sensor and fixed on the hand together with the same, for transmitting a first electromagnetic wave after receiving the trigger signal
Implementation Method 3
at least two electromagnetic wave receivers arranged at fixed positions with respect to each other, for receiving the first electromagnetic wave and generating a second electromagnetic wave and a third electromagnetic wave
Data Source
AI summary
A finger pointing apparatus is disclosed. In one aspect the finger pointing apparatus includes at least one pressure sensor fixed on a hand for triggering a corresponding electromagnetic wave transmitter to transmit electromagnetic wave when pressure is produced by a finger contacting an external object. In another aspect, the finger pointing apparatus includes at least one electromagnetic wave transmitter connected with a corresponding pressure sensor and fixed on the hand for transmitting electromagnetic wave to all electromagnetic wave receivers when pressure is detected by the pressure sensor. In one aspect, the finger pointing apparatus includes at least two electromagnetic wave receivers arranged at fixed positions with respect to each other for receiving electromagnetic wave from the at least one electromagnetic wave transmitter and transmitting received electromagnetic wave to a microprocessor. In another aspect, the finger pointing apparatus includes a microprocessor for receiving electromagnetic wave from the electromagnetic wave receivers, calculating coordinate values of a position pressed by the finger from electromagnetic wave from different electromagnetic wave receivers and outputting the coordinate values.