CN100476752C - Method and device for measuring frequency of hand writing pen - Google Patents

Method and device for measuring frequency of hand writing pen Download PDF

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Publication number
CN100476752C
CN100476752C CNB021595216A CN02159521A CN100476752C CN 100476752 C CN100476752 C CN 100476752C CN B021595216 A CNB021595216 A CN B021595216A CN 02159521 A CN02159521 A CN 02159521A CN 100476752 C CN100476752 C CN 100476752C
Authority
CN
China
Prior art keywords
frequency
circuit
coil
writing pencil
amplifier
Prior art date
Application number
CNB021595216A
Other languages
Chinese (zh)
Other versions
CN1512345A (en
Inventor
刘迎建
王红岗
赵亮
Original Assignee
汉王科技股份有限公司
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Application filed by 汉王科技股份有限公司 filed Critical 汉王科技股份有限公司
Priority to CNB021595216A priority Critical patent/CN100476752C/en
Publication of CN1512345A publication Critical patent/CN1512345A/en
Application granted granted Critical
Publication of CN100476752C publication Critical patent/CN100476752C/en

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Abstract

The detecting method and device for handwriting pen frequency is applied in the manufacture of computer peripherals and belongs to the field of test equipment. The basic principle is that the coil, which is essentially one LC loop, in handwriting pen is made to close to positive feedback circuit comprising amplifier, emitting coil, receiving coil, etc. to constitute one inductor coupled oscillator to generate oscillation in the frequency, which is approximately equal to the resonant frequency of the LC loop in the handwriting pen. Thus, the resonant frequency of the handwriting pen may be measured and may be adjusted via the capacitor in the LC loop in the handwriting pen to reach the same frequency of the circuit in the handwriting board.

Description

Writing pencil frequency measurement method and device
Technical field
This is a kind of writing pencil frequency measurement method and device that the computing machine handwriting input device is made that be applied to, and belongs to testing apparatus.
Background technology
The kind of computing machine external input device is a lot of now, equipment and mode that various non-keyboard inputs are wherein arranged, as writing pencil (plate) is exactly wherein leading products, and along with the release of TABLET computer product, the development of handwriting input product, the particularly demand of writing pencil series products have also further been promoted.Existing handwriting input mode has multiple, comprise resistance-type, condenser type, inductance type and photo-electric etc., use at present the most extensively and the most ripe be inductance type, its ultimate principle is: by the elder generation of the radiating circuit in handwriting pad launching electromagnetic wave, and receive by the circuit in the writing pencil, the wave frequency that handwriting pad is launched is identical with the resonance frequency of coil in the writing pencil circuit, make lc circuit resonance in the handwriting like this, and the lc circuit in the writing pencil handwriting can be because resonance produces vibration, and by in the handwriting pad in the XY plane equally distributed receiving circuit receive, by amplifying and filtering circuit comes out signal extraction, through calculating try to achieve planar the XY coordinate position and the pressure sensitive of corresponding person's handwriting.In this process, transmission frequency in the special requirement handwriting pad is identical with the resonance frequency of writing pencil, the function that can play corresponding effect and bring into normal play, but because technology, influence of various factors such as components and parts, the resonance frequency of writing pencil coil, before the product assembling is produced, in certain scope a uncertain numerical value, and each all can be slightly different, this situation can not satisfy the demand of actual production, give and produce and debug and bring very big inconvenience, and the transmission frequency of handwriting pad can be redefined for a definite value, therefore need adjust the resonance frequency of writing pencil circuit coil, be adjusted to the handwriting pad circuit in identical frequency.And there is not specialized apparatus before this or instrument carries out this type of work.
Summary of the invention
Purpose of the present invention just provides and a kind ofly can detect and debug the method and apparatus of the resonance frequency of writing pencil coil easily.
Purpose of the present invention realizes by such method: constitute a positive-feedback circuit by amplifier, transmitting coil, receiving coil serial connection, be called the frequency emission receiving circuit.With the coil in the writing pencil, when promptly lc circuit loop is near above-mentioned positive feedback loop, they constitute an inductive coupling oscillator jointly, the inductance value of the inductance value that makes transmitting coil and receiving coil in positive-feedback circuit inductance in the writing pencil, then transmitting coil and receiving coil can be ignored to the influence of oscillation frequency, and the oscillation frequency of this inductive coupling pierce circuit approximates the resonance frequency in lc circuit loop in the writing pencil like this.Measure the oscillation frequency of frequency emission receiving circuit with the frequency measurement display circuit, just obtain the resonance frequency of inductive coupling oscillator, promptly obtain the resonance frequency of writing pencil, if this frequency does not reach the frequency values of pre-set handwriting pad, just adjust by the electric capacity in the writing pencil circuit, and then test, carry out repeatedly with this, till the resonance frequency of writing pencil reaches requirement.
Advantage of the present invention and effect are: can directly detect the resonance frequency of coil in the writing pencil, by adjusting, can configure the resonance frequency consistent with the handwriting pad circuit fast, improve production efficiency greatly, increase yield rate.
Description of drawings
Fig. 1 is the principle of work synoptic diagram of writing pencil frequency measurement method and device.(1) be the frequency emission receiving circuit, (2) are the writing pencil resonant circuit, and (3) are the frequency measurement display circuit.
Embodiment
Below in conjunction with drawings and Examples principle of work of the present invention is described.
As shown in the figure, writing pencil frequency measurement device is made of frequency emission receiving circuit (1) and frequency measurement display circuit (3); Frequency emission receiving circuit (1) constitutes a positive-feedback circuit by amplifier A1, transmitting coil L1, receiving coil L2 serial connection; And writing pencil resonant circuit (2) is made of coil L3 and capacitor C 1 serial connection; Frequency measurement display circuit (3) can be measured the frequency of frequency emission receiving circuit (1) and show; The output terminal of amplifier A1 in the input end of frequency measurement display circuit and the frequency emission receiving circuit is connected.
When writing pencil resonant circuit (2) when the frequency emission receiving circuit (1), coil L3 in the writing pencil resonant circuit (2), capacitor C 1 resonant tank is near amplifier A1, transmitting coil L1 and receiving coil L2, by amplifier A1, transmitting coil L1, receiving coil L2 and coil L3, capacitor C 1 constitutes an inductive coupling oscillator jointly, because the inductance value of transmitting coil L1 and receiving coil L2 is much smaller than the inductance value of coil L3, so the inductance value of transmitting coil L1 and receiving coil L2 can be ignored, the oscillation frequency of inductive coupling pierce circuit approximates the resonance frequency of the circuit that is made of coil L3 and capacitor C 1, the i.e. resonance frequency of writing pencil resonant circuit like this.At this moment the frequency measurement display circuit (3) that links to each other with frequency emission receiving circuit (1) can be measured the oscillation frequency of circuit and show, just can directly obtain the resonance frequency of frequency emission receiving circuit (1) resonant tank, i.e. the resonance frequency of writing pencil resonant circuit (2).When carrying out the mensuration of writing pencil resonant circuit (2) resonance frequency partly first, the resonance frequency of writing pencil and setting value generally have certain error, at this moment can be by adjusting the numerical value of the capacitor C 1 in the writing pencil resonant circuit (2), change the resonance frequency of whole writing pencil resonant circuit (2), and then measure with frequency emission receiving circuit (1) and frequency measurement display circuit (3), measure the resonance frequency of the writing pencil resonant circuit (2) of this moment, if also do not reach predetermined value, adjust repeatedly again, until meeting the demands.
When not having writing pencil on frequency emission receiving circuit (1) side, be that a little less than the coupling very of transmitting coil L1 and receiving coil L2, the positive feedback coefficient is very little when not having the resonant tank of coil L3, capacitor C 1 formation in the accompanying drawing, can't satisfy oscillating condition, not starting of oscillation of circuit.
Said apparatus not only can be used for the production and the debugging of writing pencil, also can be used for other any adjustment and test of carrying out frequency by this way simultaneously.This installs applied range, and is simple to operate.

Claims (2)

1, a kind of writing pencil frequency measurement device is characterized in that: be made of frequency emission receiving circuit and frequency measurement display circuit; The frequency emission receiving circuit is to be made of amplifier A1, transmitting coil L1, receiving coil L2, and amplifier A1, transmitting coil L1, receiving coil L2 compose in series a positive-feedback circuit; The input end of frequency measurement display circuit is connected with the output terminal of amplifier A1 in the frequency emission receiving circuit.
2, a kind of method of utilizing the described writing pencil frequency measurement of claim 1 device to carry out the writing pencil frequency measurement, it is characterized in that: near the positive-feedback circuit in the determinator, amplifier A1, the transmitting coil L1 in coil L3, capacitor C 1 and the positive-feedback circuit in the writing pencil, receiving coil L2 constitute an inductive coupling oscillator jointly at this moment with writing pencil; The inductance value of the inductance value that makes transmitting coil L1 and receiving coil L2 in this inductive coupling oscillator inductance L 3 in the writing pencil, measure the oscillation frequency of frequency emission receiving circuit with the frequency measurement display circuit, just obtain the resonance frequency of inductive coupling oscillator, i.e. the resonance frequency of writing pencil.
CNB021595216A 2002-12-30 2002-12-30 Method and device for measuring frequency of hand writing pen CN100476752C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB021595216A CN100476752C (en) 2002-12-30 2002-12-30 Method and device for measuring frequency of hand writing pen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB021595216A CN100476752C (en) 2002-12-30 2002-12-30 Method and device for measuring frequency of hand writing pen

Publications (2)

Publication Number Publication Date
CN1512345A CN1512345A (en) 2004-07-14
CN100476752C true CN100476752C (en) 2009-04-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNB021595216A CN100476752C (en) 2002-12-30 2002-12-30 Method and device for measuring frequency of hand writing pen

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CN (1) CN100476752C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9201556B2 (en) 2006-11-08 2015-12-01 3M Innovative Properties Company Touch location sensing system and method employing sensor data fitting to a predefined curve
US8207944B2 (en) 2006-12-19 2012-06-26 3M Innovative Properties Company Capacitance measuring circuit and method
US7956851B2 (en) 2006-12-20 2011-06-07 3M Innovative Properties Company Self-tuning drive source employing input impedance phase detection
US8243049B2 (en) 2006-12-20 2012-08-14 3M Innovative Properties Company Untethered stylus employing low current power converter
US8134542B2 (en) 2006-12-20 2012-03-13 3M Innovative Properties Company Untethered stylus employing separate communication and power channels
US8040329B2 (en) 2006-12-20 2011-10-18 3M Innovative Properties Company Frequency control circuit for tuning a resonant circuit of an untethered device
US7436164B2 (en) 2006-12-20 2008-10-14 3M Innovative Properties Company Untethered device employing tunable resonant circuit
US8040330B2 (en) 2006-12-28 2011-10-18 3M Innovative Properties Company Untethered stylus empolying multiple reference frequency communication
US8089474B2 (en) 2006-12-28 2012-01-03 3M Innovative Properties Company Location sensing system and method employing adaptive drive signal adjustment
US7787259B2 (en) 2006-12-28 2010-08-31 3M Innovative Properties Company Magnetic shield for use in a location sensing system
CN103019416B (en) * 2011-09-20 2015-08-26 汉王科技股份有限公司 Time writer frequency adaptation device and method

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Effective date of registration: 20161219

Address after: 100193 Beijing, Haidian District, northeast Wang West Road, building 3, floor 363, room 5, room 8

Patentee after: BEIJING HANVON PENGTAI TECHNOLOGY CO., LTD.

Address before: 100094 Beijing City, Haidian District Zhongguancun Software Park building 5121 mailbox Hanvon

Patentee before: Hanvon Corp.

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Address after: 100193 363, 3 floor, 5 building, 8 Northeast Road, Haidian District, Beijing.

Patentee after: Beijing Hanvon Peng Thai Polytron Technologies Inc

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Patentee before: BEIJING HANVON PENGTAI TECHNOLOGY CO., LTD.

CP01 Change in the name or title of a patent holder