TWI512540B - A method of measuring the distance between the coordinate indicator and the coordinate input device - Google Patents
A method of measuring the distance between the coordinate indicator and the coordinate input device Download PDFInfo
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本發明屬於電腦週邊設備輸入領域，涉及一種測量座標指示器位置資訊的方法，尤其涉及一種測量座標指示器與座標輸入裝置距離的方法和一種座標輸入裝置。The invention belongs to the field of computer peripheral device input, and relates to a method for measuring position information of a coordinate indicator, in particular to a method for measuring a distance between a coordinate indicator and a coordinate input device and a coordinate input device.
作為電腦週邊設備之一的座標輸入裝置和座標指示器，其工作原理是：座標輸入裝置上橫向分佈有多個發射線圈，該發射線圈用於間隔性地向座標指示器上的諧振電路發送電磁信號。同時，座標輸入裝置上縱向分佈有多個接收線圈。接收線圈接收諧振電路感應的發射線圈發送的電磁信號。座標輸入裝置將承受的壓力大小以及座標指示器在座標輸入裝置上的座標資訊傳送給電腦。由電腦上的相關軟體確定座標指示器在座標輸入裝置上的移動軌跡，從而實現資訊輸入如文字錄入和繪畫的目的。The coordinate input device and the coordinate indicator, which are one of the computer peripheral devices, operate on the principle that a plurality of transmitting coils are laterally distributed on the coordinate input device, and the transmitting coils are used to intermittently transmit electromagnetic waves to the resonant circuit on the coordinate indicator. signal. At the same time, a plurality of receiving coils are longitudinally distributed on the coordinate input device. The receiving coil receives an electromagnetic signal transmitted by a transmitting coil induced by the resonant circuit. The coordinate input device transmits the pressure and the coordinate information of the coordinate indicator on the coordinate input device to the computer. The movement of the coordinate indicator on the coordinate input device is determined by the related software on the computer, thereby realizing the purpose of information input such as text entry and drawing.
確定座標指示器在座標輸入裝置上的座標資訊過程如下：在某一時刻，座標輸入裝置發射線圈組中的多個線圈順序導通並發射信號，經座標指示器感應後發送感應信號，座標輸入裝置接收線圈組中的一接收線圈導通並順序接收信號，根據接收線圈接收到的電磁信號的強弱，從而確定座標指示器的橫座標。座標輸入裝置發射線圈組中的某一發射線圈導通並發射信號，經座標指示器感應後發送 感應信號，座標輸入裝置接收線圈組中的多個接收線圈順序導通並接收信號，根據接收線圈接收到的電磁信號的強弱，從而確定座標指示器的縱座標。The process of determining the coordinate information of the coordinate indicator on the coordinate input device is as follows: at a certain moment, the plurality of coils in the transmitting coil group of the coordinate input device are sequentially turned on and emit signals, and the sensing signal is sent after being detected by the coordinate indicator, and the coordinate input device is sent. A receiving coil in the receiving coil group is turned on and sequentially receives signals, and determines the abscissa of the coordinate indicator according to the strength of the electromagnetic signal received by the receiving coil. A certain transmitting coil in the transmitting coil group of the coordinate input device is turned on and transmits a signal, and is sent after being detected by the coordinate indicator. Inductive signal, the coordinate input device receives a plurality of receiving coils in the coil group to sequentially conduct and receive signals, and determines the ordinate of the coordinate indicator according to the strength of the electromagnetic signal received by the receiving coil.
但是，通過上述方法，雖然確定了座標指示器在座標輸入裝置這個二維平面內的位置座標資訊，但無法獲得座標指示器與座標輸入裝置之間的距離。However, by the above method, although the position coordinate information of the coordinate indicator in the two-dimensional plane of the coordinate input device is determined, the distance between the coordinate indicator and the coordinate input device cannot be obtained.
本發明解決的技術問題在於提供一種測量座標指示器與座標輸入裝置距離的方法，用以克服現有技術中不能確定座標指示器與座標輸入裝置之間距離的缺陷。The technical problem solved by the present invention is to provide a method for measuring the distance between a coordinate indicator and a coordinate input device, in order to overcome the defect in the prior art that the distance between the coordinate indicator and the coordinate input device cannot be determined.
為解決上述技術問題，本發明提供一種測量座標指示器與座標輸入裝置距離的方法，座標輸入裝置設置有電磁感應板。該方法包括：電磁感應板中的測量電路測量出電磁感應板的接收線圈的輸出信號實際幅值；根據所述輸出信號實際幅值、輸出信號額定幅值，以及預先設置的信號參考幅值，確定座標指示器和座標輸入裝置的距離。In order to solve the above technical problem, the present invention provides a method of measuring a distance between a coordinate indicator and a coordinate input device, and the coordinate input device is provided with an electromagnetic induction plate. The method includes: the measuring circuit in the electromagnetic induction board measures the actual amplitude of the output signal of the receiving coil of the electromagnetic induction board; according to the actual amplitude of the output signal, the rated amplitude of the output signal, and the preset signal reference amplitude, Determine the distance between the coordinate indicator and the coordinate input device.
優選地，該方法還包括：測量所述輸出信號額定幅值：所述電磁感應板中的從控制器向接收線圈發送測量信號；根據所述測量信號，所述測量電路測量出接收線圈的放大倍數；根據所述測量信號和放大倍數，所述測量電路測量出與所述放大倍數對應的輸出信號額定幅值。Preferably, the method further comprises: measuring the rated amplitude of the output signal: the measurement signal is sent from the controller to the receiving coil in the electromagnetic induction board; and the measuring circuit measures the amplification of the receiving coil according to the measurement signal a multiple; based on the measurement signal and the amplification factor, the measurement circuit measures an output signal rated amplitude corresponding to the amplification factor.
優選地，該方法還包括：根據所述輸出信號額定幅值預先設置信號參考幅值。Preferably, the method further comprises: presetting the signal reference amplitude according to the output signal nominal amplitude.
優選地，所述從控制器向接收線圈發送測量信號包括：從控制器通過衰減電路向接收線圈發送測量信號，所述測量信號的幅值與座標指示器在座標輸入裝置上進行軌跡輸入時所述接收線圈接收的輸出信號實際幅值一致。Preferably, the transmitting, by the controller, the measurement signal to the receiving coil comprises: transmitting, by the controller, the measurement signal to the receiving coil through the attenuation circuit, the amplitude of the measurement signal and the coordinate indicator being input by the coordinate input device on the coordinate input device The actual amplitude of the output signal received by the receiving coil is the same.
優選地，所述輸出信號實際幅值與輸出信號額定幅值對應於同一放大倍數。Preferably, the actual amplitude of the output signal corresponds to the same amplitude of the output signal.
優選地，所述輸出信號實際幅值、信號參考幅值為電壓信號實際幅值；所述信號參考幅值為電壓信號參考幅值。Preferably, the output signal actual amplitude, the signal reference amplitude is a voltage signal actual amplitude; and the signal reference amplitude is a voltage signal reference amplitude.
優選地，所述座標指示器和座標輸入裝置的距離與輸出信號實際幅值成線性關係。Preferably, the distance between the coordinate indicator and the coordinate input device is linear with the actual amplitude of the output signal.
優選地，所述確定座標指示器和座標輸入裝置的距離根據由信號參考幅值和輸出信號額定幅值確定的比值與輸出信號實際幅值的乘積獲得。Preferably, the distance between the determined coordinate indicator and the coordinate input device is obtained from a product of a ratio determined by the signal reference amplitude and the output signal nominal amplitude and a product of the actual amplitude of the output signal.
為解決上述技術問題，本發明還提供一種座標輸入裝置，該座標輸入裝置包括：主控制器、從控制器、信號發生電路、衰減電路、第二多路類比開關、發射線圈、接收線圈、第一多路類比開關、增益控制電路和測量電路。其中：從控制器用於根據主控制器的指令控制信號發生電路、第二多路類比開關激勵所述發射線圈發送電磁信號，以及用於向所述接收線圈發送測量信號以確定出所述接收線圈的輸出信號額定幅值。衰減電路用於控制所述測量信號的幅值使所述測量信號的幅值與所述接收線圈的輸出信號實際幅值一致。測量電路用於根據所述測量信號確定輸出所述接收線圈的輸出信號額定幅值，以及測量接收線圈經第一多路類比開關和增益控制電路的輸出信號實際幅值。主控制器用於通過增益控制電路調節接收線圈輸出信號實際幅值，以及根據接收線圈的輸出信號額定幅值設置信號參考幅值。本發明中，通過將接收線圈的實際輸出信號幅值變換到信號參考幅值下的信號幅值，從而測量出座標指示器和座標輸入裝置之間的距離，即座標指示器距座標輸入裝置的高度。In order to solve the above technical problem, the present invention also provides a coordinate input device, comprising: a main controller, a slave controller, a signal generating circuit, an attenuation circuit, a second multi-channel analog switch, a transmitting coil, a receiving coil, and a A multi-channel analog switch, gain control circuit and measurement circuit. Wherein: the slave controller is configured to control the signal generating circuit according to the instruction of the master controller, the second multi-channel analog switch energizes the transmitting coil to transmit an electromagnetic signal, and is configured to send a measurement signal to the receiving coil to determine the receiving coil The output signal is rated at the amplitude. The attenuation circuit is configured to control the amplitude of the measurement signal such that the amplitude of the measurement signal coincides with the actual amplitude of the output signal of the receiving coil. The measuring circuit is configured to determine an output signal rated amplitude of the receiving coil according to the measurement signal, and measure an actual amplitude of the output signal of the receiving coil via the first multi-channel analog switch and the gain control circuit. The main controller is configured to adjust the actual amplitude of the output signal of the receiving coil through the gain control circuit, and set the signal reference amplitude according to the rated amplitude of the output signal of the receiving coil. In the present invention, the distance between the coordinate indicator and the coordinate input device is measured by transforming the amplitude of the actual output signal of the receiving coil to the amplitude of the signal under the signal reference amplitude, that is, the coordinate indicator is from the coordinate input device. height.
下面通過附圖和實施例，對本發明實施例的技術方案做進一步的詳細描述。The technical solutions of the embodiments of the present invention are further described in detail below through the accompanying drawings and embodiments.
座標指示器在座標輸入裝置上移動過程中，由測量電路測量座標指示器產生的電磁信號，由增益控制電路控制電磁信號始終處於測量電路的測量範圍內，因此，在不同的增益調節範圍之間，測量電路測量的電磁信號幅值是跳躍式的。具體通過座標輸入裝置上設置的接收線圈接收到的電磁信號的變化予以詳細說明。During the movement of the coordinate indicator on the coordinate input device, the electromagnetic signal generated by the coordinate indicator is measured by the measuring circuit, and the electromagnetic signal controlled by the gain control circuit is always within the measurement range of the measuring circuit, and therefore, between different gain adjustment ranges The amplitude of the electromagnetic signal measured by the measuring circuit is skipped. Specifically, the change of the electromagnetic signal received by the receiving coil provided on the coordinate input device will be described in detail.
在座標指示器遠離座標輸入裝置的過程中，座標輸入裝置上的發射線圈和接收線圈與座標指示器上設置的諧振電路距離變遠，導致接收線圈接收到的來自諧振電路的電磁信號變弱。在座標指示器遠離座標輸入裝置的過程中，信號逐漸變弱到達測量電路的測量範圍下限時，主控制器通過增益控制電路將信號的增益調大，使得接收線圈的輸出信號幅值變大，確保放大後的信號在測量電路的測量範圍內。In the process of the coordinate indicator being remote from the coordinate input device, the distance between the transmitting coil and the receiving coil on the coordinate input device and the resonant circuit provided on the coordinate indicator become far away, causing the electromagnetic signal from the resonant circuit received by the receiving coil to become weak. In the process of the coordinate indicator being away from the coordinate input device, when the signal gradually weakens to reach the lower limit of the measurement range of the measurement circuit, the main controller increases the gain of the signal by the gain control circuit, so that the amplitude of the output signal of the receiving coil becomes larger. Make sure that the amplified signal is within the measurement range of the measurement circuit.
當座標指示器接近座標輸入裝置時，座標輸入裝置上的發射線圈和接收線圈與諧振電路距離減小，導致接收線圈接收來自諧振電路產生的電磁信號變強。座標指示器在接近座標輸入裝置的過程中，信號逐漸變強最終到達測量電路的測量範圍上限時，主控制器通過增益控制電路將信號的增益調小，使得接收線圈輸出信號幅值變小，確保放大後的信號在測量電路的測量範圍內。When the coordinate indicator is close to the coordinate input device, the distance between the transmitting coil and the receiving coil on the coordinate input device and the resonant circuit is reduced, causing the receiving coil to receive an electromagnetic signal generated from the resonant circuit to become strong. When the coordinate indicator gradually becomes stronger in the process of approaching the coordinate input device and finally reaches the upper limit of the measurement range of the measurement circuit, the main controller reduces the gain of the signal by the gain control circuit, so that the amplitude of the output signal of the receiving coil becomes smaller. Make sure that the amplified signal is within the measurement range of the measurement circuit.
從上述分析可見，在不同的增益調節範圍之間，測量電路測量到的信號的幅值是跳躍式的，並不是單調的。From the above analysis, it can be seen that between different gain adjustment ranges, the amplitude of the signal measured by the measuring circuit is skipped and not monotonous.
本發明的下述實施例中，座標輸入裝置設置有電磁感應板。根據電磁感應板上接收線圈的輸出信號額定幅值來實現測量電路在不同的增益調節範圍之間測量到的信號是單調的。In the following embodiments of the invention, the coordinate input device is provided with an electromagnetic induction plate. According to the rated amplitude of the output signal of the receiving coil on the electromagnetic induction board, the signal measured by the measuring circuit between different gain adjustment ranges is monotonous.
第一圖為本發明測量座標指示器與座標輸入裝置距離的方法實施例的流程圖。如第一圖所示，座標指示器在座標輸入裝置上進行軌跡輸入的過程中，測量座標指示器與座標輸入裝置距離的方法包括：步驟S11、電磁感應板的測量電路測量出電磁感應板的接收線圈的輸出信號實際幅值；當座標指示器在電磁感應板上進行軌跡輸入時，從控制器根據主控制器的指令控制信號發生電路、第二多路類比開關激勵發射線圈向接收線圈發送電磁信號。該電磁信號經座標指示器中的諧振電路感應後，發送給電磁感應板上的接收線圈。接收線圈接收座標指示器中的諧振電路發送來的電磁信號，並經第一多路類比開關和增益控制電路進行轉換和增益調節。主控制器控制增益控制電路不斷調整第一多路類比開關的輸出信號，以使座標指示器始終處於電磁感應板上接收線圈的感應範圍內。測量電路測量經第一多路類比開關、增益控制電路處理的接收線圈的輸出信號實際幅值。The first figure is a flow chart of an embodiment of a method for measuring the distance between a coordinate indicator and a coordinate input device of the present invention. As shown in the first figure, in the process of performing the track input on the coordinate input device, the method for measuring the distance between the coordinate indicator and the coordinate input device includes: step S11, the measuring circuit of the electromagnetic induction board measures the electromagnetic induction plate. The actual amplitude of the output signal of the receiving coil; when the coordinate indicator performs the track input on the electromagnetic induction board, the slave controller controls the signal generating circuit according to the instruction of the main controller, and the second multi-channel analog switch excites the transmitting coil to send to the receiving coil Electromagnetic signal. The electromagnetic signal is sensed by a resonant circuit in the coordinate indicator and sent to a receiving coil on the electromagnetic induction board. The receiving coil receives the electromagnetic signal sent by the resonant circuit in the coordinate indicator and performs conversion and gain adjustment via the first multi-channel analog switch and the gain control circuit. The main controller controls the gain control circuit to continuously adjust the output signal of the first multi-channel analog switch so that the coordinate indicator is always within the sensing range of the receiving coil on the electromagnetic induction board. The measuring circuit measures the actual amplitude of the output signal of the receiving coil processed by the first multi-channel analog switch and the gain control circuit.
本實施例中，還包括如何測量輸出信號額定幅值的步驟。第二圖為測量輸出信號額定幅值的流程圖。如第二圖所示，測量輸出信號額定幅值的步驟包括：S21、從控制器向電磁感應板的接收線圈發送測量信號；該步驟中，從控制器可以通過衰減電路向接收線圈發送測量信號，使測量信號的幅值與座標指示器在座標輸入裝置上進行軌跡輸入過程中所述接收線圈接收的輸出信號實際幅值一致。In this embodiment, the method further includes how to measure the rated amplitude of the output signal. The second figure is a flow chart for measuring the nominal amplitude of the output signal. As shown in the second figure, the step of measuring the rated amplitude of the output signal includes: S21: transmitting a measurement signal from the controller to the receiving coil of the electromagnetic induction board; in this step, the slave controller can send the measurement signal to the receiving coil through the attenuation circuit. And making the amplitude of the measurement signal coincide with the actual amplitude of the output signal received by the receiving coil during the trajectory input of the coordinate indicator on the coordinate input device.
這裏，該測量信號與座標指示器在座標輸入裝置上進行軌跡輸入的過程中，座標指示器中的諧振電路發送給接收線圈的電磁信號是一致的。Here, in the process of the track input of the measurement signal and the coordinate indicator on the coordinate input device, the electromagnetic signal sent by the resonance circuit in the coordinate indicator to the receiving coil is consistent.
S22、根據測量信號，測量電路測量出電磁感應板接收線圈的放大倍數；S23、根據測量信號和放大倍數，測量電路測量出與放大倍數對應的輸出信號額定值。S22, according to the measurement signal, the measuring circuit measures the amplification factor of the receiving coil of the electromagnetic induction board; S23, according to the measurement signal and the amplification factor, the measuring circuit measures the rated value of the output signal corresponding to the amplification factor.
本實施例中，接收線圈可調節8級增益，其對應的放大倍數可以由大到小，分別為G1、G2、G3、G4、G5、G6、G7和G8，測量電路測量出的、對應於這8級放大倍數的輸出信號額定幅值由大到小分別為A1、A2、A3、A4、A5、A6、A7和A8。In this embodiment, the receiving coil can adjust the 8-level gain, and the corresponding amplification factor can be from large to small, respectively G1, G2, G3, G4, G5, G6, G7, and G8, and the measurement circuit measures, corresponding to The rated amplitude of the output signals of the 8-level amplification are from A1, A2, A3, A4, A5, A6, A7 and A8.
步驟S12、根據輸出信號實際幅值、輸出信號額定幅值，以及預先設置的信號參考幅值，確定座標指示器和座標輸入裝置的距離。Step S12: Determine the distance between the coordinate indicator and the coordinate input device according to the actual amplitude of the output signal, the rated amplitude of the output signal, and the preset signal reference amplitude.
本實施例中，座標指示器和座標輸入裝置的距離與輸出信號實際幅值成線性關係，根據該線性關係來確定座標指示器和座標輸入裝置的距離。該線性關係可以由信號參考幅值和輸出信號額定幅值確定的比值與輸出信號實際幅值的乘積來確定。具體地，確定座標指示器和座標輸入裝置的距離可以具體包括：根據P’=(As /A i )*Pi 確定座標指示器和座標輸入裝置的距離。其中，As 表示主控制器根據輸出信號額定幅值預先設置的信號參考幅值。Pi 表示當座標指示器在座標輸入裝置上進行軌跡輸入時測量電路測量的接收線圈的輸出信號實際幅值。該輸出信號實際幅值是指經過第一多路類比開關和增益控制電路處理後的信號的幅值。A i 表示根據從控制器發送的測量信號得到的接收線圈的輸出信號額定幅值。輸出信號實際幅值Pi 與接收線圈的輸出信號額定幅值A i 對應於同一放大倍數。In this embodiment, the distance between the coordinate indicator and the coordinate input device is linear with the actual amplitude of the output signal, and the distance between the coordinate indicator and the coordinate input device is determined according to the linear relationship. The linear relationship can be determined by the product of the ratio of the signal reference amplitude and the output signal nominal amplitude to the actual amplitude of the output signal. Specifically, determining the distance between the coordinate indicator and the coordinate input device may specifically include: determining a distance between the coordinate indicator and the coordinate input device according to P'=(A s / A i )*P i . Where A s represents the signal reference amplitude preset by the main controller according to the rated amplitude of the output signal. P i represents the actual amplitude of the output signal of the receiving coil measured by the measuring circuit when the coordinate indicator is tracked on the coordinate input device. The actual amplitude of the output signal refers to the amplitude of the signal processed by the first multi-channel analog switch and the gain control circuit. A i represents the rated amplitude of the output signal of the receiving coil obtained from the measurement signal transmitted from the controller. The actual amplitude P i of the output signal corresponds to the same amplification factor of the output signal rated amplitude A i of the receiving coil.
本實施例中，為了確定座標指示器和座標輸入裝置之間的距離，在不同的放大倍數之間實現信號的增益調節時，避免接收線圈實際輸出信號幅值呈現跳躍式。在測量出輸出信號額定幅值後由主控制器根據輸出信號額定幅值預先設置信號參考幅值。該信號參考幅值可以選自對應於接收線圈的各個放大倍數的輸出信號額定幅值。這樣，在接收線圈接收到變化的電磁信號，通過主控制器將這種電磁信號變化統一換算到與輸出信號額定幅值對應的情況下，比如從八級放大倍數G1、G2、G3、G4、G5、G6、G7和G8中選取放大倍數G1對應的額定信號幅值A1為信號參考幅值。某一時刻，接收線圈的放大倍數因座標指示器和座標輸入裝置之間的距離變小，此時，為了確保信號在測量電路的測量範圍內，對應於輸出信號額定幅值A1的放大倍數G1應減小為對應於輸出信號額定幅值A2的放大倍數G2。通過步驟11測量出在放大倍數G2時的接收線圈輸出信號實際幅值P2，將在輸出信號額定幅值A2情形下的接收線圈輸出信號實際幅值P2通過公式P’=(As /A i )*Pi 變換，從而獲得座標指示器與座標輸入裝置的距離。In this embodiment, in order to determine the distance between the coordinate indicator and the coordinate input device, when the gain adjustment of the signal is realized between different amplification factors, the amplitude of the actual output signal of the receiving coil is prevented from jumping. After measuring the rated amplitude of the output signal, the main controller presets the signal reference amplitude according to the rated amplitude of the output signal. The signal reference amplitude may be selected from an output signal nominal amplitude corresponding to respective magnifications of the receiving coil. In this way, when the receiving coil receives the changed electromagnetic signal, the main controller changes the electromagnetic signal change uniformly to the rated amplitude of the output signal, for example, from the eight-stage amplification factor G1, G2, G3, G4, The rated signal amplitude A1 corresponding to the amplification factor G1 selected in G5, G6, G7 and G8 is the signal reference amplitude. At a certain moment, the magnification of the receiving coil becomes smaller due to the distance between the coordinate indicator and the coordinate input device. At this time, in order to ensure that the signal is within the measuring range of the measuring circuit, the magnification G1 corresponding to the rated amplitude A1 of the output signal is obtained. It should be reduced to a magnification G2 corresponding to the rated amplitude A2 of the output signal. The actual amplitude P2 of the receiving coil output signal at the amplification factor G2 is measured by step 11, and the actual amplitude P2 of the receiving coil output signal in the case of the output signal rated amplitude A2 is passed by the formula P'=(A s / A i ) * P i transform, thereby obtaining the distance between the coordinate indicator and the coordinate input device.
本實施例中，輸出信號實際幅值可以為電壓信號實際幅值。信號參考幅值可以為電壓信號參考幅值。In this embodiment, the actual amplitude of the output signal may be the actual amplitude of the voltage signal. The signal reference amplitude can be the voltage signal reference amplitude.
本實施例中，通過將接收線圈的實際輸出信號幅值變換到信號參考幅值下的信號幅值，從而確定出了座標指示器和座標輸入裝置之間的距離，克服了現有技術中不能確定座標指示器與座標輸入裝置之間的距離的缺陷。In this embodiment, by changing the amplitude of the actual output signal of the receiving coil to the signal amplitude under the signal reference amplitude, the distance between the coordinate indicator and the coordinate input device is determined, which overcomes the uncertainty in the prior art. A defect in the distance between the coordinate indicator and the coordinate input device.
第三圖為本發明座標輸入裝置的結構示意圖。如第三圖所示，座標輸入裝置1具體包括接收線圈組10、與接收線圈組10連接的第一多路類比開關11、與第一多路類比開關11連接的增益控制電路12、與增益控制電路12連接的測量電路13、以及與測量電路13連接的主控制器14、與主控制器14連接的從控制器15、與從控制器15連接的信號發生電路16，以及與信號發生電路16連接的第二多路類比開關17，與第二多路類比開關17連接的發射線圈組18，與從控制器15連接的衰減電路19。從控制器15與測量電路13連接，從控制器15根據主控制器14的指令控制信號發生電路16、第二多路類比開關17激勵發射線圈組18間隔地發送電磁信號，使接收線圈組10的接收的電磁信號相位與信號發生電路16產生的信號相位同步。The third figure is a schematic structural view of the coordinate input device of the present invention. As shown in the third figure, the coordinate input device 1 specifically includes a receiving coil group 10, a first multi-way analog switch 11 connected to the receiving coil group 10, a gain control circuit 12 connected to the first multi-channel analog switch 11, and a gain. a measurement circuit 13 connected to the control circuit 12, a main controller 14 connected to the measurement circuit 13, a slave controller 15 connected to the main controller 14, a signal generation circuit 16 connected to the slave controller 15, and a signal generation circuit The 16-connected second multi-channel analog switch 17, the transmitting coil group 18 connected to the second multi-way analog switch 17, and the attenuating circuit 19 connected from the controller 15. The controller 15 is connected to the measuring circuit 13, and the slave controller 15 controls the signal generating circuit 16 according to the command of the main controller 14, and the second multi-channel analog switch 17 excites the transmitting coil group 18 to intermittently transmit electromagnetic signals, so that the receiving coil group 10 is The received electromagnetic signal phase is synchronized with the phase of the signal generated by the signal generating circuit 16.
為了獲知接收線圈10的輸出信號額定幅值並根據輸出信號額定幅值確定信號參考幅值，主控制器14控制從控制器15通過衰減電路19向接收線圈10發送一測量信號。該測量信號可以類比座標指示器在靠近或遠離座標輸入裝置11的過程中接收線圈10接收到的電磁信號。如何根據測量信號確定信號參考幅值請參見前述部分。In order to know the output signal rated amplitude of the receiving coil 10 and determine the signal reference amplitude based on the output signal rated amplitude, the main controller 14 controls the slave controller 15 to transmit a measurement signal to the receiving coil 10 through the attenuation circuit 19. The measurement signal can receive the electromagnetic signal received by the coil 10 during the process of approaching or moving away from the coordinate input device 11 analogous to the coordinate indicator. How to determine the signal reference amplitude based on the measurement signal can be found in the previous section.
在確定座標指示器和座標輸入裝置的距離時，可以通過主控制器14將接收線圈的輸出信號額定幅值、輸出信號實際幅值以及預先設置的信號參考幅值等資訊發送給電腦，借助電腦上的軟體程式從而確定出座標指示器和座標輸入裝置的距離。When determining the distance between the coordinate indicator and the coordinate input device, the main controller 14 can send information such as the rated amplitude of the output signal of the receiving coil, the actual amplitude of the output signal, and the preset signal reference amplitude to the computer, by means of the computer. The software program on it determines the distance between the coordinate indicator and the coordinate input device.
1‧‧‧座標輸入裝置1‧‧‧Coordinate input device
10‧‧‧接收線圈組10‧‧‧Receiving coil set
11‧‧‧第一多路類比開關11‧‧‧First multi-channel analog switch
12‧‧‧增益控制電路12‧‧‧gain control circuit
13‧‧‧測量電路13‧‧‧Measurement circuit
14‧‧‧主控制器14‧‧‧Master controller
15‧‧‧從控制器15‧‧‧ slave controller
16‧‧‧信號發生電路16‧‧‧Signal generation circuit
17‧‧‧第二多路類比開關17‧‧‧Second multi-channel analog switch
18‧‧‧發射線圈組18‧‧‧Transmission coil set
19‧‧‧衰減電路19‧‧‧Attenuation circuit
第一圖為本發明測量座標指示器與座標輸入裝置距離的方法實施例的流程圖；第二圖為測量輸出信號額定幅值的流程圖；第三圖為本發明座標輸入裝置的結構示意圖。The first figure is a flow chart of a method for measuring the distance between the coordinate indicator and the coordinate input device of the present invention; the second figure is a flow chart for measuring the rated amplitude of the output signal; and the third figure is a schematic structural view of the coordinate input device of the present invention.
Claims (7)
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| US5218174A (en) * | 1991-10-01 | 1993-06-08 | Kurta Corporation | Low power cordless magnetic field digitizer with differential grid sensing and synchronous position demodulation |
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