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Ultrasonic handwriting input system

A handwriting input, ultrasonic technology, applied in the field of ultrasonic sensing, can solve problems such as large errors

Inactive Publication Date: 2013-09-11
MEASUREMENT SPECIALTIES CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the embodiments of the present invention is to provide an ultrasonic handwriting input system, aiming to solve the problem of large errors caused by the tilt of the ultrasonic stylus during the handwriting process existing in the existing ultrasonic handwriting input system

Method used

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0045] The present invention proposes two concepts, one is no tilt error (No-Tilt) completely; the other is the concept of small tilt error or tilt error compensation. Such as Figure 4 As shown, no matter how the ultrasonic stylus 22 is tilted, the ultrasonic waves emitted by the ultrasonic emission points PS2, PS21, and PS22 must enter the surrounding air through the nib point PJ2 of the stylus 22, and the effective ultrasonic waves received by the ultrasonic receiving sensor 25 are obtained by handwriting. The nib point PJ2 of the pen 22 exits. Thus, the handwriting trajectory calculated by th...

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Abstract

The invention is applicable to the technical field of ultrasonic sensing, and provides an ultrasonic handwriting input system. The ultrasonic handwriting input system at least comprises a handwriting input working plane, an ultrasonic handwriting pen and at least two ultrasonic receiving sensors, wherein the ultrasonic handwriting pen moves on the working plane; the at least two ultrasonic receiving sensors receive ultrasonic sent by the ultrasonic handwriting pen and are mutually separated; the ultrasonic handwriting pen comprises a casing and an ultrasonic sending sensor, an ultrasonic outlet is formed in a pen point part of the casing, and the ultrasonic sending sensor is arranged in the casing and sends the ultrasonic to the working plane through the ultrasonic outlet; and effective ultrasonic received by the ultrasonic receiving sensors is ultrasonic reflected by the working plane. The effective ultrasonic enters the ultrasonic receiving sensor through reflection of the working plane, so that an ultrasonic propagation path has the advantage as follows: when the ultrasonic handwriting pen tilts, calculation errors caused by tilting are less smaller when compared with tilting errors in the prior art.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic sensing, in particular to an ultrasonic handwriting input system. Background technique [0002] With the popularity of digital devices, such as smartphones, computers, and conference projection interactive presentation systems, handwriting input and interaction with various digital terminals have also become popular. There are many application examples. One application example is the touch screen handwriting screen of a mobile phone or a computer; the second application example is a stylus and a tablet. The trajectory on the board is digitally transmitted to the digital device to realize handwriting input. The third application example is the projection conference system. The information of the digital device such as the computer is displayed on the projection plane such as the curtain sheet or the wall or a customized projection board through projection. A peripheral handwriting The input sys...

Claims

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Application Information

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IPC IPC(8): G06F3/043G06F3/0354
Inventor 程永红
Owner MEASUREMENT SPECIALTIES CHINA
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