Capacitance distance measuring method and device
A technology of a ranging device and a ranging method, applied in the field of ranging, can solve the problems of large amount of calculation, huge device and high hardware requirements, and achieve the effect of reducing the amount of calculation
Active Publication Date: 2009-03-11
LENOVO (BEIJING) LTD
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[0003] There are many kinds of sensing devices based on distance measurement, such as laser ranging, radio ranging, etc. This type of ranging device is mainly used in precision measurement, but these devices are very large, complex and expensive, and are not suitable for installation in computers. above, which measures the distance between the user and the computer
Ultrasonic distance measurement, infrared light reflection distance measurement, image recognition distance measurement and other distance measurement devices can be made relatively small and can be installed on a computer. The requirements are high, and the amount of calculation is very large, and a high-performance microprocessor is required to realize these functions
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[0036] The basic idea of the present invention is as figure 1 As shown, two adjacent areas on the circuit board form the two poles of capacitance Cp. When a person's finger or human body is close to Cp, the parasitic capacitance C of the human body F The two electrodes coupled to Cp will increase the value of Cp. By measuring the change of Cp, the distance between the human body and the two electrodes can be measured. The distance measured by this method can reach tens of centimeters.
[0037] Convert the capacitance value of capacitor Cp into digital quantity C out , this digitized capacitance value C out input to a microcontroller (MCU, Micro Controller Unit), and the microcontroller calculates the input data to obtain the distance S between the human body and the capacitor Cp.
[0038] figure 2 is the distance between the body of different users and the capacitor and the capacitance value C out Correspondence between. C out The larger the distance S is, the smaller...
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The invention discloses a capacitive distance measuring equipment, which comprises: an analog-digital signal converter, a reforming unit and a microcontroller, wherein, the analog-digital signal converter is connected with a capacitance to be measured and the reforming unit, and used for transforming the value of the capacitance to be measured into a digital signal; the reforming unit is connected with the microcontroller, and used for transforming capacitance parameters into measurement parameters and transmitting the measurement parameters to the microcontroller; the microcontroller calculates the distance according to the relational expression between the distance and the measurement parameters and outputs the distance. The invention also discloses a corresponding method, which comprises the step of setting the relational expression which calculates the distance according to the measurement parameters, and the value of the parameters; the method also comprises the following steps of: transforming the value of the capacitance to be measured into the digital signal, and transforming the capacitance parameters into the measurement parameters; and determining a measurement model, and calculating the distance according to the set relational expression and outputting the distance. The invention can roughly or precisely calculate the distance between two objects, and has simple structure and convenient use.
Description
technical field [0001] The invention relates to ranging technology, in particular to a capacitive ranging method and device. Background technique [0002] At present, computer operations such as turning on the computer and opening the CD-ROM drive can only be realized after the user's finger touches and presses the corresponding button. There is a lack of automatic detection of the distance between the user and the computer on the computer, and then according to the distance between the user and the computer. It is a device that provides corresponding feedback and instructions based on the distance between them, which makes the computer stay in the state of just a machine, without interaction with people. [0003] There are many kinds of sensing devices based on distance measurement, such as laser ranging, radio ranging, etc. This type of ranging device is mainly used in precision measurement, but these devices are very large, complex and expensive, and are not suitable for ...
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IPC IPC(8): G01B7/02
Inventor 刘湘涛马雷
Owner LENOVO (BEIJING) LTD