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WO2010007731A1 - Indicator and position detection device - Google Patents

Indicator and position detection device Download PDF

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Publication number
WO2010007731A1
WO2010007731A1 PCT/JP2009/002831 JP2009002831W WO2010007731A1 WO 2010007731 A1 WO2010007731 A1 WO 2010007731A1 JP 2009002831 W JP2009002831 W JP 2009002831W WO 2010007731 A1 WO2010007731 A1 WO 2010007731A1
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WO
WIPO (PCT)
Prior art keywords
magnetic member
change
indicator
detection
fixed magnetic
Prior art date
Application number
PCT/JP2009/002831
Other languages
French (fr)
Japanese (ja)
Inventor
小川保二
Original Assignee
株式会社ニューコム
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Publication date
Application filed by 株式会社ニューコム filed Critical 株式会社ニューコム
Priority to CN2009801276849A priority Critical patent/CN102099773A/en
Publication of WO2010007731A1 publication Critical patent/WO2010007731A1/en

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412Digitisers structurally integrated in a display

Definitions

  • the present invention relates to a pointing device and a position detection device, and in particular, position detection capable of detecting a pointing position of a pointing device by detecting a change in the degree of electromagnetic coupling between a driving side loop wiring group and a detection side loop wiring group on a detection surface.
  • the present invention relates to an indicating tool and a position detection device used in the apparatus.
  • a coordinate input device called a digitizer
  • the digitizer includes an pointing tool and a position detection device, and an operator performs operations such as cursor movement and drawing on the detection surface of the position detection device with the pointing tool.
  • Some of these digitizers can detect not only the pointing position but also whether the pointing tool has touched the detection surface (pen down / pen up) and the writing pressure of the pointing tool.
  • a contact such as a switch is provided at the tip of the indicator, and a pen-down is detected by this ON / OFF, or a pressure-sensitive resistor element or pressure-sensitive capacitance element is provided at the tip of the indicator or the detection surface to detect pen-down.
  • a contact such as a switch is provided at the tip of the indicator, and a pen-down is detected by this ON / OFF, or a pressure-sensitive resistor element or pressure-sensitive capacitance element is provided at the tip of the indicator or the detection surface to detect pen-down.
  • the pointing tool disclosed in Patent Document 1 can detect pen down and writing pressure.
  • This has two ferrite cores, one ferrite core is configured to be movable with respect to the other ferrite core, and a coil is wound around the other ferrite core.
  • This coil is electrically connected to a capacitor and forms a resonance circuit together with this capacitor.
  • the indicator as disclosed in Patent Document 1 uses a resonance circuit composed of a coil and a capacitor, and the pen pressure can be detected by detecting a change in the resonance frequency of the resonance circuit with a detection device. It was something. Therefore, there is a problem in durability and reliability because a contact, a pressure sensitive element, or the like is used or a resonance circuit is used. In addition, the number of parts increases, which may increase the cost.
  • the present invention provides an indicating tool and a position detecting device that can detect that the pointing tool has touched the detection surface while the pointing tool has touched the detection surface even though the resonant circuit or the like is unnecessary. It is something to be offered.
  • an indicator according to the present invention is composed of a fixed magnetic member made of a magnetic material and a magnetic material, and is configured to be movable with respect to the fixed magnetic member.
  • a movable magnetic member whose distance between the fixed magnetic member and the fixed magnetic member changes when touched by the indicator, and the indicator detects the change based on a change in the degree of electromagnetic coupling caused by a change in the distance between the fixed magnetic member and the movable magnetic member.
  • the position detection device can detect that the surface has been touched.
  • an elastic body is provided that applies an urging force to the movable magnetic member in a direction in which the movable magnetic member is separated from the fixed magnetic member.
  • the position detection device may be capable of detecting the writing pressure applied to the detection surface by the pointing tool.
  • the fixed magnetic member and / or the movable magnetic member may be made of ferrite.
  • the position detection device determines whether or not the change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member and the movable magnetic member of the pointing tool is larger than a predetermined change amount. It may have a pen-down detection unit that detects that the touched the detection surface.
  • it may have a writing pressure calculation unit that calculates the writing pressure by detecting the amount of change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member and the movable magnetic member of the pointing tool.
  • input by a plurality of pointing devices may be detectable.
  • a plurality of indicators can be identified by detecting a pattern in which the degree of electromagnetic coupling changes in response to inputs from a plurality of indicators having different shapes and / or magnetic materials of the fixed magnetic member and / or the movable magnetic member. It may have a pointing device identifying unit.
  • it may have a display device stacked on the detection surface.
  • the pointing device and the position detection device of the present invention have an advantage that the position detection device can detect that the pointing device has touched the detection surface, even though the pointing device has a simple configuration.
  • FIG. 1 is a schematic view for explaining an indicator and a position detection device of the present invention.
  • FIG. 2 is a schematic cross-sectional view in the longitudinal direction for explaining the indicator of the present invention.
  • FIG. 3 is a graph showing a change characteristic of the degree of electromagnetic coupling with respect to the distance between the fixed magnetic member and the movable magnetic member.
  • FIG. 1 is a schematic view for explaining an indicator and a position detection device of the present invention.
  • the present invention includes the pointing tool 10 and the position detection device 20.
  • the indicator 10 has a magnetic material, but a detailed configuration example will be described later.
  • the position detection device has any configuration as long as it can detect the indicated position of the pointing tool by detecting the change in the degree of electromagnetic coupling between the driving side loop wiring group and the detection side loop wiring group on the detection surface. May be.
  • the position detection device 20 in the illustrated example includes a detection surface 21, a drive unit 22, and a detection unit 23.
  • the detection surface 21 is provided with a plurality of drive-side loop wires (drive-side loop wire group) 220 and a plurality of detection-side loop wires (detection-side loop wire group) 230.
  • the drive unit 22 drives a plurality of drive side loop wirings 220, and the detection unit 23 detects changes in the degree of electromagnetic coupling from the plurality of detection side loop wirings 230.
  • the driving side loop wiring 220 and the detection side loop wiring 230 are each composed of a linear wiring, and are arranged so as to be orthogonal to each other.
  • the drive unit 22 is mainly composed of an oscillator 223 and a switch 224.
  • the drive unit 22 is sequentially connected to each drive-side loop wiring 220, and the drive-side loop wiring 220 is sequentially driven at a high frequency.
  • the detection unit 23 is mainly composed of a switch 232, an amplifier 233, and a synchronous detection unit 234.
  • the detection unit 23 is sequentially connected to each detection-side loop wiring 230, and from the detection-side loop wiring 230, The induced current or induced voltage is detected sequentially.
  • the output from the oscillator 223 is also connected to the synchronous detection unit 234, and the product of the output from the oscillator 223 and the output from the detection-side loop wiring 230 is taken, and this is integrated over time.
  • it may be configured to detect from all the detection side loop wirings at once by providing a detection circuit separately for each detection side loop wiring or combining a frequency filter circuit or the like.
  • the drive unit 22 and the detection unit 23 are controlled by the microprocessor 30 so as to obtain a desired output. Specifically, first, the drive unit 22 is connected to the first drive-side loop wiring 220, the detection unit 23 is sequentially connected to the plurality of detection-side loop wirings 230, and the output signal at that time is measured. Then, the drive unit 22 is connected to the second drive side loop wiring 220, and the detection unit 23 is sequentially connected to the plurality of detection side loop wirings 230, and the output signal at that time is measured. By repeating this, it is possible to measure output signals at all positions where the intersections of the driving side loop wiring 220 and the detection side loop wiring 230 on the detection surface 21 are XY coordinates.
  • the driving side loop wiring 220 and the detection side loop wiring 230 are orthogonal to each other, so that electromagnetic coupling is not performed. Even if the driving side loop wiring 220 is driven, no induced current or induced voltage is output from the detection side loop wiring 230.
  • electromagnetic coupling is performed at the intersection near the pointing position of the pointing tool 10. And an induced current or induced voltage is output from the detection-side loop wiring 230.
  • the position coordinates of the indicator can be detected even if the indicator floats by a distance that is affected by the magnetic material of the indicator near the detection surface. Is also possible.
  • the position detection device capable of detecting the indication position of the pointing tool by detecting the change in the degree of electromagnetic coupling between the driving-side loop wiring group and the detection-side loop wiring group on the detection surface as described above.
  • the position detection device used in the present invention is not limited to the one in which the driving side loop wiring and the detection side loop wiring are indirectly electromagnetically coupled, as in the above-described example of the drawing, but directly electromagnetically coupled. It does not matter. That is, a conductor piece may be provided in the vicinity of the intersection of the drive side loop wiring and the detection side loop wiring on the detection surface so that the intersection is electromagnetically coupled.
  • the driving side loop wiring and the detection side loop wiring on the detection surface are formed in an arch shape so that the intersecting portions thereof constitute a coil, and the intersection is electromagnetically coupled. good.
  • the position detecting device configured to be directly electromagnetically coupled in this way, the measured induced current or induced voltage is increased by placing an indicator having a magnetic material on the detection surface. By detecting this increase, the pointing position coordinates of the pointing tool can be detected as in the above example.
  • Such a configuration is also described in, for example, Japanese Patent Application No. 2006-169145 by the same applicant as the present applicant.
  • FIG. 2 is a schematic cross-sectional view in the longitudinal direction for explaining the indicator of the present invention.
  • the indicator 10 of the present invention is mainly composed of a fixed magnetic member 11 and a movable magnetic member 12. These components are accommodated in a pen-shaped housing 18.
  • the movable magnetic member 12 is also described as being detached from the casing 18, but a means for preventing the movable magnetic member from being removed may be provided as appropriate.
  • the fixed magnetic member 11 is made of a magnetic material.
  • a material having ferromagnetism is preferable, and examples thereof include ferrite, alnico, and permalloy.
  • the fixed magnetic member 11 is fixed to the housing 18, for example, and moves integrally with the pointing tool 10.
  • the movable magnetic member 12 is also made of a magnetic material. Similar to the fixed magnetic member 11, the magnetic material is preferably a material having ferromagnetism, and examples thereof include ferrite, alnico, and permalloy.
  • the movable magnetic member 12 is configured to be movable with respect to the fixed magnetic member 11. That is, the movable magnetic member 12 is not fixed to the casing 18, and an urging force is applied in a direction in which the movable magnetic member 12 is separated from the fixed magnetic member 11 using an elastic body 19 such as an O-ring. Yes.
  • the tip portion of the pointing tool that contacts the detection surface 21 is configured by the movable magnetic member 12, but the present invention is not limited to this, and the tip portion may be other than the magnetic member. It is also possible to use a member.
  • a resin or the like that covers the tip of the movable magnetic member may be provided.
  • the fixed magnetic member and the movable magnetic member may be formed in a cylindrical shape, and a writing instrument core may be provided at the center of the cylinder. Examples of writing instrument cores include various types such as mechanical pencils, ballpoint pen cores, marker pen cores, and the like.
  • FIG. 3 is a graph showing a change characteristic of the degree of electromagnetic coupling with respect to the distance between the fixed magnetic member and the movable magnetic member.
  • the vertical axis represents the relative value when the degree of electromagnetic coupling when the distance between the magnetic members is 0 is 100. As illustrated, it can be seen that the degree of electromagnetic coupling increases rapidly as the distance between the fixed magnetic member and the movable magnetic member decreases.
  • the position detection device can detect that the pointing tool has touched the detection surface. Yes. That is, as shown in FIG. 1, the position detection device 20 of the present invention receives an output from the microprocessor 30 and detects that the pointing tool 10 has touched the detection surface 21, and a pointing tool 40. It has a writing pressure calculation unit 50 that calculates ten writing pressures. Hereinafter, these will be described in detail.
  • the pen-down detection unit 40 determines whether the change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member 11 and the movable magnetic member 12 of the pointing tool 10 is larger than a predetermined change amount. Is detected touching the detection surface 21. For example, based on the change characteristic of FIG. 3, when the degree of electromagnetic coupling exceeds 60, it is determined that the pointing tool 10 has touched the detection surface 21.
  • the pen down with a small stroke Is preferably detectable.
  • the pointing device of the present invention for example, as is apparent from the change characteristics of FIG. 3, a significant change appears in a small stroke range (0 mm to 0.4 mm), and therefore, between the fixed magnetic member and the movable magnetic member. If the distance is set to 0.5 mm, for example, pen-down detection can be performed with a very small stroke, and an easy-to-use pointing tool and position detection device can be provided.
  • the writing pressure calculation unit 50 calculates the writing pressure by detecting the amount of change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member 11 and the movable magnetic member 12 of the pointing tool 10. For example, using the change characteristics shown in FIG. 3, the writing pressure with respect to the change amount is obtained in advance as a conversion curve, and when the change amount of the electromagnetic coupling degree (change in the amplitude of the induced current or induced voltage) is detected, the conversion curve is obtained. Is used to find the pen pressure corresponding to the amount of change. Note that the amount of change in the degree of electromagnetic coupling may be used as it is as writing pressure (degree of pressing strength). It is also possible to perform calibration by previously inputting to the detection surface with the maximum writing pressure and storing a change characteristic based on the maximum writing pressure.
  • the movable magnetic member 12 is given an urging force in a direction in which the movable magnetic member 12 is separated from the fixed magnetic member 11 by an elastic body 19 such as an O-ring. Since the urging force (elastic force) of the elastic body 19 affects the writing pressure calculation as described above, the elastic force of the elastic body 19 may be determined in accordance with a desired writing pressure calculation capability. For example, when it is desired to detect a more accurate writing pressure with respect to a light writing pressure, the elastic force of the elastic body 19 may be set to be weak. Further, when it is desired to detect even a heavy writing pressure, the elastic force of the elastic body 19 may be set higher.
  • the elastic body is not necessarily used. It is not necessary to provide it.
  • the movable magnetic member is configured to be movable without being given an urging force by the elastic body, the movable magnetic member is lowered by gravity in the pen-up state, and the distance between the fixed magnetic member and the movable magnetic member is reduced.
  • the pen-down state the fixed magnetic member and the movable magnetic member come into contact with each other, so as in the above example, based on the change in the degree of electromagnetic coupling, the position of the indicator touching the detection surface is detected.
  • the device is detectable.
  • the pen-down detection unit and the writing pressure calculation unit can cause the microprocessor to perform these processes.
  • the position detection device of the present invention even if the pointing tool is not in contact with the detection surface, the position of the pointing tool is lifted by a distance that is affected by the magnetic material of the pointing tool in the vicinity of the detection surface. Coordinates can be detected. Therefore, the movement of the cursor, which is a user interface for pointing an instruction or operation target in an electronic computer such as a personal computer, is moved in accordance with the coordinates where the change in the electromagnetic coupling degree is detected. When pen-down is detected, it is possible to switch to functions such as click and drawing. Even when the user interface is switched to a function such as drawing, the writing pressure calculation unit can calculate the writing pressure of the pointing tool. Therefore, it is possible to provide a pointing tool and a position detection device that are very easy to use as a digitizer used as an input device such as a computer.
  • a display device may be laminated on the detection surface of the position detection device. That is, it is possible to arrange the detection surface so as to correspond to the display area of the display device and to form a touch panel display device.
  • the drive-side loop wiring group and the detection-side loop wiring group arranged on the detection surface are made of, for example, a transparent conductor, so that the detection surface of the position detection device can be placed on the display device without disturbing the display of the display device. It can be placed on the display screen.
  • the position detection device used in the present invention is capable of detecting the indicated position of the pointing tool by detecting a change in the degree of electromagnetic coupling between the driving side loop wiring group and the detection side loop wiring group on the detection surface.
  • a change in the degree of electromagnetic coupling is detected at a plurality of locations. That is, when a plurality of pointing tools are input on the detection surface, electromagnetic coupling occurs at the intersections in the vicinity of the respective pointing positions of the plurality of pointing tools among the intersections of the drive side loop wiring and the detection side loop wiring.
  • the position detection device when performing input to the position detection device using a plurality of pointing tools, it is possible to identify and detect the plurality of pointing tools by making the configuration of each pointing tool different. That is, a plurality of indicators having different shapes and / or magnetic materials of the fixed magnetic member and / or the movable magnetic member are prepared. For example, in two indicating tools, different diameters of the movable magnetic member are used. In this case, the patterns in which the electromagnetic coupling degrees of the driving side loop wiring group and the detection side loop wiring group change are detected differently.
  • the cross-sectional shape is changed to a triangle, square, circle, etc., or even if the shape is made different using a plurality of magnetic members, there is a pattern in which the electromagnetic coupling degree changes similarly. Each is detected differently.
  • the magnetic materials may be made different. Specifically, the magnetism may be made different in strength. In this case, it is possible to increase detection accuracy by detecting the temporal change.
  • an indicator identifying unit that identifies a plurality of indicators by detecting a pattern in which the degree of electromagnetic coupling changes is provided between the microprocessor 30 and the pen-down detector 40 shown in FIG. It becomes possible to identify a plurality of pointing devices according to the detection pattern whose degree has changed.
  • the pointing device of the present invention does not require a power source or a circuit as in the conventional pointing device, for example, the position detecting device is applied to an electronic blackboard or an electronic whiteboard, and a plurality of pointing devices are used. Even in this case, it can be realized at a very low cost.
  • the indicator of the present invention does not require a power source or circuit elements, it is excellent in durability and reliability.
  • the pointing device of the present invention is not limited to the illustrated examples described above, and it is needless to say that various changes can be made without departing from the gist of the present invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Position Input By Displaying (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Provided are an indicator with a simple configuration and a position detection device, the contact of the indicator with a detection plane being detectable by the position detection device. An indicator (10) is used for a position detection device (20) which can detect the position indicated by the indicator by detecting the change of the degree of electromagnetic coupling between a drive-side loop line group and a detection-side loop line group (220, 230) of a detection plane (21).  The indicator is provided with a fixed magnetic member (11) and a movable magnetic member (12) which are produced from a magnetic material.  The movable magnetic member (12) is movable with respect to the fixed magnetic member (11), and the distance therefrom to the fixed magnetic member (11) changes when the indicator comes into contact with the detection plane.  The position detection device (20) detects the contact of the indicator (10) with the detection plane (21) on the basis of the change of the degree of electromagnetic coupling caused by the change of the distance between the fixed magnetic member (11) and the movable magnetic member (12).

Description

指示具及び位置検出装置Indicator and position detection device
 本発明は指示具及び位置検出装置に関し、特に、検出面の駆動側ループ配線群と検出側ループ配線群の電磁結合度の変化を検出することで、指示具の指示位置を検出可能な位置検出装置に用いられる指示具及び位置検出装置に関する。 The present invention relates to a pointing device and a position detection device, and in particular, position detection capable of detecting a pointing position of a pointing device by detecting a change in the degree of electromagnetic coupling between a driving side loop wiring group and a detection side loop wiring group on a detection surface. The present invention relates to an indicating tool and a position detection device used in the apparatus.
 従来から、コンピュータ等の入力デバイスとして、デジタイザと呼ばれる座標入力装置が知られている。デジタイザは、指示具と位置検出装置から構成され、操作者は指示具により位置検出装置の検出面上でカーソル移動や描画等の操作を行うものである。このようなデジタイザは、指示位置を検出するだけでなく、指示具が検出面に接触したか否か(ペンダウン/ペンアップ)や、指示具の筆圧を検出可能なものもあった。 Conventionally, a coordinate input device called a digitizer is known as an input device such as a computer. The digitizer includes an pointing tool and a position detection device, and an operator performs operations such as cursor movement and drawing on the detection surface of the position detection device with the pointing tool. Some of these digitizers can detect not only the pointing position but also whether the pointing tool has touched the detection surface (pen down / pen up) and the writing pressure of the pointing tool.
 例えば、指示具先端にスイッチ等の接点を設け、このON/OFFでペンダウンを検出するものや、感圧抵抗素子や感圧容量素子等を指示具先端、又は検出面に設けて、ペンダウンを検出するもの等も存在している。 For example, a contact such as a switch is provided at the tip of the indicator, and a pen-down is detected by this ON / OFF, or a pressure-sensitive resistor element or pressure-sensitive capacitance element is provided at the tip of the indicator or the detection surface to detect pen-down. There are things to do.
 また、例えば特許文献1に開示された指示具は、ペンダウンと筆圧を検出可能なものである。これは、2個のフェライトコアを有し、一方のフェライトコアは他方のフェライトコアに対して移動可能に構成されており、他方のフェライトコアにはコイルが巻回されている。このコイルは電気的にコンデンサと接続されており、このコンデンサと共に共振回路を構成している。このように構成された指示具で検出面上に入力すると、フェライトコア間の距離が変化する。この変化により、フェライトコアに巻回されたコイルのインダクタンスが変化するため、共振回路の共振周波数が変化することになる。したがって、検出装置によって共振回路の共振周波数の変化を検出することで、指示具の筆圧を検出できるものであった。 For example, the pointing tool disclosed in Patent Document 1 can detect pen down and writing pressure. This has two ferrite cores, one ferrite core is configured to be movable with respect to the other ferrite core, and a coil is wound around the other ferrite core. This coil is electrically connected to a capacitor and forms a resonance circuit together with this capacitor. When the pointing device configured in this way is used to input on the detection surface, the distance between the ferrite cores changes. Due to this change, the inductance of the coil wound around the ferrite core changes, so that the resonance frequency of the resonance circuit changes. Therefore, the pen pressure of the pointing tool can be detected by detecting the change in the resonance frequency of the resonance circuit by the detection device.
特開2006-163798号公報JP 2006-163798 A
 従来の指示具や位置検出装置では、指示具の指示位置検出のため以外に、指示具先端にペンダウンや筆圧を検出するための特別の素子等を必要とするものであった。また、特許文献1に開示されるような指示具は、コイルやコンデンサからなる共振回路を用いたものであり、この共振回路の共振周波数の変化を検出装置で検出することにより筆圧を検出可能なものであった。したがって、接点や感圧素子等を用いたり共振回路を用いているため、耐久性や信頼性に問題があった。また、部品点数が増加し、コストアップとなる場合もあった。 Conventional pointing devices and position detection devices require a special element for detecting pen down or writing pressure at the tip of the pointing device, in addition to detecting the pointing position of the pointing device. Moreover, the indicator as disclosed in Patent Document 1 uses a resonance circuit composed of a coil and a capacitor, and the pen pressure can be detected by detecting a change in the resonance frequency of the resonance circuit with a detection device. It was something. Therefore, there is a problem in durability and reliability because a contact, a pressure sensitive element, or the like is used or a resonance circuit is used. In addition, the number of parts increases, which may increase the cost.
 本発明は、斯かる実情に鑑み、共振回路等が不要でシンプルな構成の指示具でありながら、指示具が検出面に触れたことを位置検出装置が検出可能な指示具及び位置検出装置を提供しようとするものである。 In view of such circumstances, the present invention provides an indicating tool and a position detecting device that can detect that the pointing tool has touched the detection surface while the pointing tool has touched the detection surface even though the resonant circuit or the like is unnecessary. It is something to be offered.
 上述した本発明の目的を達成するために、本発明による指示具は、磁性材料からなる固定磁性部材と、磁性材料からなり、固定磁性部材に対して移動可能に構成され、指示具が検出面に触れると固定磁性部材との間の距離が変化する可動磁性部材と、を具備し、固定磁性部材と可動磁性部材との間の距離の変化による電磁結合度の変化に基づき、指示具が検出面に触れたことを位置検出装置が検出可能であるものである。 In order to achieve the above-described object of the present invention, an indicator according to the present invention is composed of a fixed magnetic member made of a magnetic material and a magnetic material, and is configured to be movable with respect to the fixed magnetic member. A movable magnetic member whose distance between the fixed magnetic member and the fixed magnetic member changes when touched by the indicator, and the indicator detects the change based on a change in the degree of electromagnetic coupling caused by a change in the distance between the fixed magnetic member and the movable magnetic member. The position detection device can detect that the surface has been touched.
 さらに、可動磁性部材が固定磁性部材に対して離れる方向に可動磁性部材に付勢力を与える弾性体を具備し、固定磁性部材と可動磁性部材との間の距離の変化による電磁結合度の変化に基づき、指示具が検出面に与える筆圧を位置検出装置が検出可能であるものであっても良い。 Furthermore, an elastic body is provided that applies an urging force to the movable magnetic member in a direction in which the movable magnetic member is separated from the fixed magnetic member. The position detection device may be capable of detecting the writing pressure applied to the detection surface by the pointing tool.
 また、固定磁性部材及び/又は可動磁性部材は、フェライトからなるものであれば良い。 The fixed magnetic member and / or the movable magnetic member may be made of ferrite.
 また、本発明による位置検出装置は、指示具の固定磁性部材と可動磁性部材との間の距離の変化による電磁結合度の変化が所定の変化量よりも大きいか否か判定することで指示具が検出面に触れたことを検出するペンダウン検出部を有するものであっても良い。 Further, the position detection device according to the present invention determines whether or not the change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member and the movable magnetic member of the pointing tool is larger than a predetermined change amount. It may have a pen-down detection unit that detects that the touched the detection surface.
 さらに、指示具の固定磁性部材と可動磁性部材との間の距離の変化による電磁結合度の変化量を検出することで筆圧を算出する筆圧算出部を有するものであっても良い。 Furthermore, it may have a writing pressure calculation unit that calculates the writing pressure by detecting the amount of change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member and the movable magnetic member of the pointing tool.
 またさらに、複数の指示具による入力が検出可能であっても良い。 Furthermore, input by a plurality of pointing devices may be detectable.
 さらに、固定磁性部材及び/又は可動磁性部材の形状及び/又は磁性材料がそれぞれ相違する複数の指示具による入力に対して、電磁結合度が変化するパターンを検出することで複数の指示具を識別する指示具識別部を有するものであっても良い。 Furthermore, a plurality of indicators can be identified by detecting a pattern in which the degree of electromagnetic coupling changes in response to inputs from a plurality of indicators having different shapes and / or magnetic materials of the fixed magnetic member and / or the movable magnetic member. It may have a pointing device identifying unit.
 さらに、検出面に積層される表示装置を有するものであっても良い。 Furthermore, it may have a display device stacked on the detection surface.
 本発明の指示具及び位置検出装置には、シンプルな構成の指示具でありながら、指示具が検出面に触れたことを位置検出装置が検出可能であるという利点がある。 The pointing device and the position detection device of the present invention have an advantage that the position detection device can detect that the pointing device has touched the detection surface, even though the pointing device has a simple configuration.
図1は、本発明の指示具及び位置検出装置を説明するための概略図である。FIG. 1 is a schematic view for explaining an indicator and a position detection device of the present invention. 図2は、本発明の指示具を説明するための長手方向の断面概略図である。FIG. 2 is a schematic cross-sectional view in the longitudinal direction for explaining the indicator of the present invention. 図3は、固定磁性部材と可動磁性部材との間の距離に対する電磁結合度の変化特性を表すグラフである。FIG. 3 is a graph showing a change characteristic of the degree of electromagnetic coupling with respect to the distance between the fixed magnetic member and the movable magnetic member.
 以下、本発明を実施するための最良の形態を図示例と共に説明する。図1は、本発明の指示具及び位置検出装置を説明するための概略図である。図示の通り、本発明には、指示具10と位置検出装置20とが含まれるものである。指示具10は、磁性材料を有するものであるが、詳細な構成例については、後に説明する。 Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a schematic view for explaining an indicator and a position detection device of the present invention. As shown in the drawing, the present invention includes the pointing tool 10 and the position detection device 20. The indicator 10 has a magnetic material, but a detailed configuration example will be described later.
 さて、位置検出装置は、検出面の駆動側ループ配線群と検出側ループ配線群の電磁結合度の変化を検出することで、指示具の指示位置を検出可能なものであれば如何なる構成であっても良い。一例として、図示例の位置検出装置20は、検出面21と駆動部22と検出部23とからなる。検出面21には、複数の駆動側ループ配線(駆動側ループ配線群)220と複数の検出側ループ配線(検出側ループ配線群)230とが設けられている。駆動部22は、複数の駆動側ループ配線220を駆動するものであり、検出部23は、複数の検出側ループ配線230から電磁結合度の変化を検出するものである。 The position detection device has any configuration as long as it can detect the indicated position of the pointing tool by detecting the change in the degree of electromagnetic coupling between the driving side loop wiring group and the detection side loop wiring group on the detection surface. May be. As an example, the position detection device 20 in the illustrated example includes a detection surface 21, a drive unit 22, and a detection unit 23. The detection surface 21 is provided with a plurality of drive-side loop wires (drive-side loop wire group) 220 and a plurality of detection-side loop wires (detection-side loop wire group) 230. The drive unit 22 drives a plurality of drive side loop wirings 220, and the detection unit 23 detects changes in the degree of electromagnetic coupling from the plurality of detection side loop wirings 230.
 図示例の位置検出装置20では、駆動側ループ配線220と検出側ループ配線230がそれぞれ直線的な配線からなり、それぞれ直交するように配置されている。そして、駆動部22は、発振器223と切替器224とから主になるものであり、駆動部22を各駆動側ループ配線220に順次接続していき、駆動側ループ配線220を順次高周波駆動する。一方、検出部23は、切替器232とアンプ233と同期検波部234とから主になるものであり、検出部23を各検出側ループ配線230に順次接続していき、検出側ループ配線230から誘導電流又は誘導電圧を順次検出する。同期検波部234には、発振器223からの出力も接続され、発振器223からの出力と検出側ループ配線230からの出力の積を取り、これを時間積分する。なお、検出側ループ配線毎に別々に検出回路を設けたり周波数フィルタ回路等を組み合わせたりすることで、すべての検出側ループ配線から一度に検出するように構成しても良い。 In the position detection apparatus 20 in the illustrated example, the driving side loop wiring 220 and the detection side loop wiring 230 are each composed of a linear wiring, and are arranged so as to be orthogonal to each other. The drive unit 22 is mainly composed of an oscillator 223 and a switch 224. The drive unit 22 is sequentially connected to each drive-side loop wiring 220, and the drive-side loop wiring 220 is sequentially driven at a high frequency. On the other hand, the detection unit 23 is mainly composed of a switch 232, an amplifier 233, and a synchronous detection unit 234. The detection unit 23 is sequentially connected to each detection-side loop wiring 230, and from the detection-side loop wiring 230, The induced current or induced voltage is detected sequentially. The output from the oscillator 223 is also connected to the synchronous detection unit 234, and the product of the output from the oscillator 223 and the output from the detection-side loop wiring 230 is taken, and this is integrated over time. In addition, it may be configured to detect from all the detection side loop wirings at once by providing a detection circuit separately for each detection side loop wiring or combining a frequency filter circuit or the like.
 これらの駆動部22及び検出部23は、マイクロプロセッサ30で制御され、所望な出力が得られるよう構成されている。具体的には、まず1つ目の駆動側ループ配線220に駆動部22を接続し、検出部23を複数の検出側ループ配線230に順次接続してそのときの出力信号を測定する。そして2つ目の駆動側ループ配線220に駆動部22を接続し、検出部23を複数の検出側ループ配線230に順次接続してそのときの出力信号を測定する。これを繰り返すことで、検出面21における駆動側ループ配線220と検出側ループ配線230の交点をXY座標とするすべての位置における出力信号を測定することができる。 The drive unit 22 and the detection unit 23 are controlled by the microprocessor 30 so as to obtain a desired output. Specifically, first, the drive unit 22 is connected to the first drive-side loop wiring 220, the detection unit 23 is sequentially connected to the plurality of detection-side loop wirings 230, and the output signal at that time is measured. Then, the drive unit 22 is connected to the second drive side loop wiring 220, and the detection unit 23 is sequentially connected to the plurality of detection side loop wirings 230, and the output signal at that time is measured. By repeating this, it is possible to measure output signals at all positions where the intersections of the driving side loop wiring 220 and the detection side loop wiring 230 on the detection surface 21 are XY coordinates.
 このような構成の位置検出装置20において、指示具10が検出面21上に入力されていない状態では、駆動側ループ配線220と検出側ループ配線230は直交しているため電磁結合はせず、駆動側ループ配線220を駆動していても検出側ループ配線230からは誘導電流又は誘導電圧は出力されない。そして、磁性材料を有する指示具10が検出面21上に入力されると、駆動側ループ配線220と検出側ループ配線230の交点部分のうち、指示具10の指示位置近傍の交点部分では電磁結合が生じ、検出側ループ配線230から誘導電流又は誘導電圧が出力される。そこで、この出力が得られたXY座標を検出することにより、検出面21上に置かれた指示具10の指示位置座標を検出することが可能である。なお、指示具が検出面上に接触していなくても、検出面上の近傍で指示具の磁性材料の影響を受ける程度の距離だけ浮かした場合にも、指示具の位置座標を検出することも可能である。 In the position detection device 20 having such a configuration, when the pointing tool 10 is not input on the detection surface 21, the driving side loop wiring 220 and the detection side loop wiring 230 are orthogonal to each other, so that electromagnetic coupling is not performed. Even if the driving side loop wiring 220 is driven, no induced current or induced voltage is output from the detection side loop wiring 230. When the pointing tool 10 having a magnetic material is input on the detection surface 21, among the intersections of the driving side loop wiring 220 and the detection side loop wiring 230, electromagnetic coupling is performed at the intersection near the pointing position of the pointing tool 10. And an induced current or induced voltage is output from the detection-side loop wiring 230. Therefore, it is possible to detect the indicated position coordinates of the pointing tool 10 placed on the detection surface 21 by detecting the XY coordinates from which this output is obtained. Even if the indicator is not in contact with the detection surface, the position coordinates of the indicator can be detected even if the indicator floats by a distance that is affected by the magnetic material of the indicator near the detection surface. Is also possible.
 本発明では、上述のような、検出面の駆動側ループ配線群と検出側ループ配線群の電磁結合度の変化を検出することで、指示具の指示位置を検出可能な位置検出装置を用いる。なお、本発明に用いられる位置検出装置は、上述の図示例のように、駆動側ループ配線と検出側ループ配線が間接的に電磁結合するものには限定されず、直接的に電磁結合するものであっても構わない。即ち、検出面の駆動側ループ配線と検出側ループ配線の交点近傍に導電体片を設け、交点が電磁結合するように構成されたものであっても良い。また、検出面の駆動側ループ配線及び検出側ループ配線が、それらの交差する部分がそれぞれコイルを構成するようにアーチ状に形成され、交点が電磁結合するように構成されたものであっても良い。このように直接的に電磁結合するように構成された位置検出装置の場合には、測定される誘導電流又は誘導電圧は、磁性材料を有する指示具が検出面上に置かれることで増加するため、この増加分を検出することにより上述の例と同様に指示具の指示位置座標を検出することが可能となる。なお、このような構成は、例えば、本願出願人と同一の出願人による特願2006-169145等にも記載されている。 In the present invention, the position detection device capable of detecting the indication position of the pointing tool by detecting the change in the degree of electromagnetic coupling between the driving-side loop wiring group and the detection-side loop wiring group on the detection surface as described above. Note that the position detection device used in the present invention is not limited to the one in which the driving side loop wiring and the detection side loop wiring are indirectly electromagnetically coupled, as in the above-described example of the drawing, but directly electromagnetically coupled. It does not matter. That is, a conductor piece may be provided in the vicinity of the intersection of the drive side loop wiring and the detection side loop wiring on the detection surface so that the intersection is electromagnetically coupled. Further, even if the driving side loop wiring and the detection side loop wiring on the detection surface are formed in an arch shape so that the intersecting portions thereof constitute a coil, and the intersection is electromagnetically coupled. good. In the case of the position detecting device configured to be directly electromagnetically coupled in this way, the measured induced current or induced voltage is increased by placing an indicator having a magnetic material on the detection surface. By detecting this increase, the pointing position coordinates of the pointing tool can be detected as in the above example. Such a configuration is also described in, for example, Japanese Patent Application No. 2006-169145 by the same applicant as the present applicant.
 さて、上述のような位置検出装置に用いられる本発明の指示具について、図2を用いて説明する。図2は、本発明の指示具を説明するための長手方向の断面概略図である。図示の通り、本発明の指示具10は、固定磁性部材11と可動磁性部材12とから主に構成されている。なお、これらの構成要素は、ペン形状の筐体18に収容されている。なお、図面上、可動磁性部材12が筐体18から抜けるようにも記載されているが、可動磁性部材の抜け防止手段を適宜設ければ良い。 Now, the pointing tool of the present invention used in the position detection apparatus as described above will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view in the longitudinal direction for explaining the indicator of the present invention. As shown in the figure, the indicator 10 of the present invention is mainly composed of a fixed magnetic member 11 and a movable magnetic member 12. These components are accommodated in a pen-shaped housing 18. In the drawing, the movable magnetic member 12 is also described as being detached from the casing 18, but a means for preventing the movable magnetic member from being removed may be provided as appropriate.
 固定磁性部材11は、磁性材料からなるものである。磁性材料としては、強磁性を有する材料が好ましく、例えばフェライトやアルニコ、パーマロイ等が挙げられる。固定磁性部材11は、例えば筐体18に固定されており、指示具10と一体的に運動するものである。 The fixed magnetic member 11 is made of a magnetic material. As the magnetic material, a material having ferromagnetism is preferable, and examples thereof include ferrite, alnico, and permalloy. The fixed magnetic member 11 is fixed to the housing 18, for example, and moves integrally with the pointing tool 10.
 可動磁性部材12も磁性材料からなるものである。固定磁性部材11と同様に、磁性材料としては、強磁性を有する材料が好ましく、例えばフェライトやアルニコ、パーマロイ等が挙げられる。可動磁性部材12は、固定磁性部材11に対して移動可能に構成されている。即ち、可動磁性部材12は、筐体18に固定されておらず、Oリング等の弾性体19を用いて、可動磁性部材12が固定磁性部材11に対して離れる方向に付勢力が与えられている。そして、指示具10の検出面21への押圧により、固定磁性部材11と可動磁性部材12が接触するように、Oリング等の弾性体19を介して固定磁性部材11側に突出する突出部が可動磁性部材12に形成されている。したがって、可動磁性部材12は、固定磁性部材11に近づいたり離れたりできるよう構成されているため、指示具10が検出面21に触れると、固定磁性部材11と可動磁性部材12との間の距離が変化する。 The movable magnetic member 12 is also made of a magnetic material. Similar to the fixed magnetic member 11, the magnetic material is preferably a material having ferromagnetism, and examples thereof include ferrite, alnico, and permalloy. The movable magnetic member 12 is configured to be movable with respect to the fixed magnetic member 11. That is, the movable magnetic member 12 is not fixed to the casing 18, and an urging force is applied in a direction in which the movable magnetic member 12 is separated from the fixed magnetic member 11 using an elastic body 19 such as an O-ring. Yes. And the protrusion part which protrudes in the fixed magnetic member 11 side via elastic bodies 19, such as an O-ring, so that the fixed magnetic member 11 and the movable magnetic member 12 may contact by the pressing to the detection surface 21 of the indicator 10 It is formed on the movable magnetic member 12. Accordingly, since the movable magnetic member 12 is configured to be able to approach or leave the fixed magnetic member 11, the distance between the fixed magnetic member 11 and the movable magnetic member 12 when the pointing tool 10 touches the detection surface 21. Changes.
 なお、図示例では、検出面21に接触する指示具の先端部分を、可動磁性部材12で構成した例を示したが、本発明はこれに限定されず、先端部分を磁性部材以外の他の部材とすることも可能である。例えば、可動磁性部材の先端を覆うような樹脂等を設けても良い。また、固定磁性部材及び可動磁性部材を円筒状に構成し、円筒中心に筆記具の芯を設けるようにしても良い。筆記具の芯の例としては、シャープペンシルやボールペンの芯やマーカペンの芯等種々のものが挙げられる。このように構成すると、位置検出装置上に紙等を敷き、紙上に実際に筆記具により描画しつつ、その入力を位置検出装置により電子化することも可能となる。 In the illustrated example, the tip portion of the pointing tool that contacts the detection surface 21 is configured by the movable magnetic member 12, but the present invention is not limited to this, and the tip portion may be other than the magnetic member. It is also possible to use a member. For example, a resin or the like that covers the tip of the movable magnetic member may be provided. Alternatively, the fixed magnetic member and the movable magnetic member may be formed in a cylindrical shape, and a writing instrument core may be provided at the center of the cylinder. Examples of writing instrument cores include various types such as mechanical pencils, ballpoint pen cores, marker pen cores, and the like. With this configuration, paper or the like is laid on the position detection device, and the input can be digitized by the position detection device while actually drawing on the paper with a writing instrument.
 ここで、固定磁性部材と可動磁性部材との間の距離の変化は、駆動側ループ配線群と検出側ループ配線群の電磁結合度の変化(誘導電流又は誘導電圧の振幅の変化)として現れる。図3は、固定磁性部材と可動磁性部材との間の距離に対する電磁結合度の変化特性を表すグラフである。なお、縦軸は磁性部材間の距離が0のときの電磁結合度を100とした場合の相対値である。図示の通り、固定磁性部材と可動磁性部材との間の距離が狭くなるに連れて、電磁結合度が急激に大きくなることが分かる。特に、固定磁性部材と可動磁性部材との間の距離が0.4mm以下の辺りから顕著な変化が現れていることが分かる。即ち、固定磁性部材と可動磁性部材との間の距離が、駆動側ループ配線と検出側ループ配線の各交点に与える相互インダクタンスに非常に大きな変化を与えていることが分かる。 Here, the change in the distance between the fixed magnetic member and the movable magnetic member appears as a change in the degree of electromagnetic coupling (change in the amplitude of the induced current or induced voltage) between the driving side loop wiring group and the detection side loop wiring group. FIG. 3 is a graph showing a change characteristic of the degree of electromagnetic coupling with respect to the distance between the fixed magnetic member and the movable magnetic member. The vertical axis represents the relative value when the degree of electromagnetic coupling when the distance between the magnetic members is 0 is 100. As illustrated, it can be seen that the degree of electromagnetic coupling increases rapidly as the distance between the fixed magnetic member and the movable magnetic member decreases. In particular, it can be seen that a remarkable change appears when the distance between the fixed magnetic member and the movable magnetic member is around 0.4 mm or less. That is, it can be seen that the distance between the fixed magnetic member and the movable magnetic member greatly changes the mutual inductance given to each intersection of the drive side loop wiring and the detection side loop wiring.
 なお、これらのグラフについては、駆動側ループ配線群と検出側ループ配線群の構成や固定磁性部材、可動磁性部材の大きさ等により変化するものであるため、本発明は、具体的な数値等がこれらの図示例のものに限定されるものではない。但し、固定磁性部材と可動磁性部材との距離が狭くなるに連れて電磁結合度が急激に大きくなる傾向は、駆動側ループ配線群と検出側ループ配線群の構成や固定磁性部材、可動磁性部材の大きさ等が変わっても同様である。 Note that these graphs vary depending on the configuration of the driving side loop wiring group and the detection side loop wiring group, the size of the fixed magnetic member, the movable magnetic member, and the like. However, the present invention is not limited to the illustrated examples. However, as the distance between the fixed magnetic member and the movable magnetic member becomes shorter, the degree of electromagnetic coupling tends to increase rapidly. The configuration of the drive side loop wiring group and the detection side loop wiring group, the fixed magnetic member, and the movable magnetic member The same is true even if the size or the like changes.
 そこで、本発明では、この固定磁性部材と可動磁性部材との間の距離の変化による電磁結合度の変化に基づき、指示具が検出面に触れたことを位置検出装置で検出可能なようにしている。即ち、図1に示されるように、本発明の位置検出装置20は、マイクロプロセッサ30からの出力を受け、指示具10が検出面21に触れたことを検出するペンダウン検出部40と、指示具10の筆圧を算出する筆圧算出部50を有している。以下、これらについて詳細に説明する。 Therefore, in the present invention, based on the change in the degree of electromagnetic coupling caused by the change in the distance between the fixed magnetic member and the movable magnetic member, the position detection device can detect that the pointing tool has touched the detection surface. Yes. That is, as shown in FIG. 1, the position detection device 20 of the present invention receives an output from the microprocessor 30 and detects that the pointing tool 10 has touched the detection surface 21, and a pointing tool 40. It has a writing pressure calculation unit 50 that calculates ten writing pressures. Hereinafter, these will be described in detail.
 ペンダウン検出部40は、指示具10の固定磁性部材11と可動磁性部材12との間の距離に変化による電磁結合度の変化が所定の変化量よりも大きいか否か判定することで指示具10が検出面21に触れたことを検出する。例えば、図3の変化特性に基づき、電磁結合度が60を越えたら指示具10が検出面21に触れたと判定する。 The pen-down detection unit 40 determines whether the change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member 11 and the movable magnetic member 12 of the pointing tool 10 is larger than a predetermined change amount. Is detected touching the detection surface 21. For example, based on the change characteristic of FIG. 3, when the degree of electromagnetic coupling exceeds 60, it is determined that the pointing tool 10 has touched the detection surface 21.
 指示具においては、指示具先端の検出面への接触からペンダウン検出が可能となるまでのストロークが大きすぎると、文字や絵等を入力する上で使い勝手が悪いものとなるため、小さなストロークでペンダウンを検出可能であることが好ましい。本発明の指示具では、例えば図3の変化特性からも明らかなように、小さいストロークの範囲(0mm~0.4mm)において顕著な変化が現れるため、固定磁性部材と可動磁性部材との間の距離を例えば0.5mmに設定しておけば、非常に小さなストロークでペンダウン検出が可能となり、使い勝手の良い指示具及び位置検出装置を提供可能となる。 For the pointing tool, if the stroke from the contact of the tip of the pointing tool to the detection surface until the pen-down detection becomes possible is too large, it becomes inconvenient to input characters and pictures, so the pen down with a small stroke. Is preferably detectable. In the pointing device of the present invention, for example, as is apparent from the change characteristics of FIG. 3, a significant change appears in a small stroke range (0 mm to 0.4 mm), and therefore, between the fixed magnetic member and the movable magnetic member. If the distance is set to 0.5 mm, for example, pen-down detection can be performed with a very small stroke, and an easy-to-use pointing tool and position detection device can be provided.
 そして、筆圧算出部50は、指示具10の固定磁性部材11と可動磁性部材12との間の距離の変化による電磁結合度の変化量を検出することで筆圧を算出する。例えば、図3の変化特性を用いて、変化量に対する筆圧を変換曲線として予め求めておき、電磁結合度の変化量(誘導電流又は誘導電圧の振幅の変化)が検出されたら、その変換曲線を用いて変化量に対応する筆圧を求める。なお、電磁結合度の変化量を筆圧(押圧の強さの度合い)としてそのまま用いても良い。また、予め検出面への入力を最大筆圧により行い、これを基準とした変化特性を記憶してキャリブレーションすることも可能である。 The writing pressure calculation unit 50 calculates the writing pressure by detecting the amount of change in the degree of electromagnetic coupling due to the change in the distance between the fixed magnetic member 11 and the movable magnetic member 12 of the pointing tool 10. For example, using the change characteristics shown in FIG. 3, the writing pressure with respect to the change amount is obtained in advance as a conversion curve, and when the change amount of the electromagnetic coupling degree (change in the amplitude of the induced current or induced voltage) is detected, the conversion curve is obtained. Is used to find the pen pressure corresponding to the amount of change. Note that the amount of change in the degree of electromagnetic coupling may be used as it is as writing pressure (degree of pressing strength). It is also possible to perform calibration by previously inputting to the detection surface with the maximum writing pressure and storing a change characteristic based on the maximum writing pressure.
 ここで、本発明の指示具の可動磁性部材に付勢力を与える弾性体について説明する。図2に示されるように、可動磁性部材12は、Oリング等の弾性体19により、可動磁性部材12が固定磁性部材11に対して離れる方向に付勢力が与えられている。この弾性体19の付勢力(弾性力)については、上述のように筆圧算出に影響するため、所望の筆圧算出能力に合わせて弾性体19の弾性力を決定すれば良い。例えば、軽い筆圧に対してより正確な筆圧を検出したい場合には、弾性体19の弾性力は弱めに設定すれば良い。また、重い筆圧まで検出したい場合には、弾性体19の弾性力は強めに設定すれば良い。 Here, an elastic body that applies a biasing force to the movable magnetic member of the pointing device of the present invention will be described. As shown in FIG. 2, the movable magnetic member 12 is given an urging force in a direction in which the movable magnetic member 12 is separated from the fixed magnetic member 11 by an elastic body 19 such as an O-ring. Since the urging force (elastic force) of the elastic body 19 affects the writing pressure calculation as described above, the elastic force of the elastic body 19 may be determined in accordance with a desired writing pressure calculation capability. For example, when it is desired to detect a more accurate writing pressure with respect to a light writing pressure, the elastic force of the elastic body 19 may be set to be weak. Further, when it is desired to detect even a heavy writing pressure, the elastic force of the elastic body 19 may be set higher.
 なお、上述の図示例では、弾性体により可動磁性部材に付勢力を与える例を示したが、ペンダウン検出のみを目的とし、筆圧算出を行わないような態様の場合には、弾性体は必ずしも設けなくても良い。例えば、可動磁性部材は、弾性体により付勢力を与えられなくても、移動可能に構成されているため、ペンアップの状態では重力により下がり、固定磁性部材と可動磁性部材との間の距離が開いた状態となるが、ペンダウンの状態では固定磁性部材と可動磁性部材が接触するため、上述の例と同様に、電磁結合度の変化に基づき、指示具が検出面に触れたことを位置検出装置が検出可能である。 In the illustrated example described above, an example in which the urging force is applied to the movable magnetic member by the elastic body is shown. However, in the case where the pen pressure is calculated only for the purpose of detecting the pen-down, the elastic body is not necessarily used. It is not necessary to provide it. For example, since the movable magnetic member is configured to be movable without being given an urging force by the elastic body, the movable magnetic member is lowered by gravity in the pen-up state, and the distance between the fixed magnetic member and the movable magnetic member is reduced. In the pen-down state, the fixed magnetic member and the movable magnetic member come into contact with each other, so as in the above example, based on the change in the degree of electromagnetic coupling, the position of the indicator touching the detection surface is detected. The device is detectable.
 したがって、本発明によれば、電源も不要でシンプルな構成の指示具でありながら、指示具の指示位置だけでなく、ペンダウン検出や筆圧算出も可能となる。なお、ペンダウン検出部や筆圧算出部は、マイクロプロセッサにおいてこれらの処理を行わせることも可能である。また、マイクロプロセッサやペンダウン検出部、筆圧算出部として機能させるための、パーソナルコンピュータ等の電子計算機用のプログラムとして提供しても良い。 Therefore, according to the present invention, not only the pointing position of the pointing tool but also the pen-down detection and the writing pressure calculation can be performed while the pointing tool has a simple configuration and does not require a power source. Note that the pen-down detection unit and the writing pressure calculation unit can cause the microprocessor to perform these processes. Moreover, you may provide as a program for electronic computers, such as a personal computer, to function as a microprocessor, a pendown detection part, and a writing pressure calculation part.
 本発明の位置検出装置では、指示具が検出面上に接触していなくても、検出面上の近傍で指示具の磁性材料の影響を受ける程度の距離だけ浮かした場合に、指示具の位置座標を検出することが可能である。したがって、パーソナルコンピュータ等の電子計算機における指示や操作の対象を指し示すためのユーザインタフェースであるカーソルの動きを、この電磁結合度の変化が検出された座標に対応させて移動させ、さらにペンダウン検出部によりペンダウンが検出された場合には、クリックや描画等の機能に切り替えることが可能となる。そして、ユーザインタフェースを描画等の機能に切り替えたときにも、筆圧算出部により指示具の筆圧を算出することが可能となる。したがって、コンピュータ等の入力デバイスとして用いられるデジタイザとしても非常に使い勝手の良い指示具及び位置検出装置を提供可能となる。 In the position detection device of the present invention, even if the pointing tool is not in contact with the detection surface, the position of the pointing tool is lifted by a distance that is affected by the magnetic material of the pointing tool in the vicinity of the detection surface. Coordinates can be detected. Therefore, the movement of the cursor, which is a user interface for pointing an instruction or operation target in an electronic computer such as a personal computer, is moved in accordance with the coordinates where the change in the electromagnetic coupling degree is detected. When pen-down is detected, it is possible to switch to functions such as click and drawing. Even when the user interface is switched to a function such as drawing, the writing pressure calculation unit can calculate the writing pressure of the pointing tool. Therefore, it is possible to provide a pointing tool and a position detection device that are very easy to use as a digitizer used as an input device such as a computer.
 さらに、必要により、位置検出装置の検出面に表示装置を積層しても良い。即ち、表示装置の表示エリアに対応するように検出面を配置し、タッチパネル表示装置の形態とすることも可能である。この場合、検出面に配置される駆動側ループ配線群と検出側ループ配線群を、例えば透明導電体で構成することで、表示装置の表示を妨げることなく位置検出装置の検出面を表示装置の表示画面上に配置可能である。 Further, if necessary, a display device may be laminated on the detection surface of the position detection device. That is, it is possible to arrange the detection surface so as to correspond to the display area of the display device and to form a touch panel display device. In this case, the drive-side loop wiring group and the detection-side loop wiring group arranged on the detection surface are made of, for example, a transparent conductor, so that the detection surface of the position detection device can be placed on the display device without disturbing the display of the display device. It can be placed on the display screen.
 次に、本発明において、複数の指示具を用いて位置検出装置に入力を行う場合について説明する。本発明で用いられる位置検出装置は、検出面の駆動側ループ配線群と検出側ループ配線群の電磁結合度の変化を検出することで指示具の指示位置を検出可能なものであり、複数の指示具による入力があった場合には、複数の箇所で電磁結合度の変化が検出される。即ち、複数の指示具が検出面上に入力されると、駆動側ループ配線と検出側ループ配線の交点部分のうち、複数の指示具のそれぞれの指示位置近傍の交点部分で電磁結合が生じ、検出側ループ配線から誘導電流又は誘導電圧としてそれぞれ出力される。そこで、これらの出力が得られたXY座標をそれぞれ算出することにより、検出面上に置かれた複数の指示具の指示位置座標をそれぞれ検出することが可能である。 Next, in the present invention, a case will be described where input is made to the position detection device using a plurality of pointing tools. The position detection device used in the present invention is capable of detecting the indicated position of the pointing tool by detecting a change in the degree of electromagnetic coupling between the driving side loop wiring group and the detection side loop wiring group on the detection surface. When there is an input from the pointing tool, a change in the degree of electromagnetic coupling is detected at a plurality of locations. That is, when a plurality of pointing tools are input on the detection surface, electromagnetic coupling occurs at the intersections in the vicinity of the respective pointing positions of the plurality of pointing tools among the intersections of the drive side loop wiring and the detection side loop wiring. It is output as an induced current or an induced voltage from the detection side loop wiring. Thus, by calculating the XY coordinates from which these outputs are obtained, it is possible to detect the indicated position coordinates of a plurality of pointing tools placed on the detection surface.
 また、固定磁性部材と可動磁性部材との間の距離の変化による電磁結合度の変化をそれぞれ用いることで、上述の例と同様に、ペンダウン検出や筆圧算出を行うことも可能である。 Also, by using the change in the degree of electromagnetic coupling caused by the change in the distance between the fixed magnetic member and the movable magnetic member, respectively, it is possible to perform pen-down detection and writing pressure calculation as in the above example.
 さらに、複数の指示具を用いて位置検出装置に入力を行う場合に、各指示具の構成をそれぞれ相違させることで、複数の指示具をそれぞれ識別して検出させることも可能である。即ち、固定磁性部材及び/又は可動磁性部材の形状及び/又は磁性材料がそれぞれ相違する複数の指示具を用意する。例えば、2つの指示具において、可動磁性部材の径をそれぞれ大小異なるもの用いる。この場合、駆動側ループ配線群と検出側ループ配線群の電磁結合度が変化するパターンがそれぞれ相違して検出される。即ち、大きい径の可動磁性部材を用いた指示具が検出面に置かれると、指示位置近傍の電磁結合が生じる交点部分の範囲が径に応じて広くなるため、電磁結合度が変化するパターンが大きく検出される。一方、小さい径の可動磁性部材を用いた指示具が検出面に置かれると、電磁結合度が変化するパターンが小さく検出される。したがって、この変化パターンを検出することで、複数の指示具をそれぞれ識別することが可能となる。径の大小だけでなく、断面形状を三角や四角、円形等に相違させたり、複数本の磁性部材を用いて形状を相違させるように構成しても、同様に電磁結合度が変化するパターンがそれぞれ相違して検出される。さらに、磁性材料を相違させる、具体的には、磁気を強弱に相違させても良い。この場合には、時間的変化も検出するように構成することで、検出精度を上げることが可能である。 Furthermore, when performing input to the position detection device using a plurality of pointing tools, it is possible to identify and detect the plurality of pointing tools by making the configuration of each pointing tool different. That is, a plurality of indicators having different shapes and / or magnetic materials of the fixed magnetic member and / or the movable magnetic member are prepared. For example, in two indicating tools, different diameters of the movable magnetic member are used. In this case, the patterns in which the electromagnetic coupling degrees of the driving side loop wiring group and the detection side loop wiring group change are detected differently. That is, when a pointing tool using a movable magnetic member having a large diameter is placed on the detection surface, the range of the intersection portion where electromagnetic coupling near the pointing position occurs is widened according to the diameter, so the pattern in which the degree of electromagnetic coupling changes Largely detected. On the other hand, when an indicator using a movable magnetic member having a small diameter is placed on the detection surface, a pattern in which the degree of electromagnetic coupling changes is detected small. Therefore, by detecting this change pattern, it is possible to identify a plurality of pointing devices. Not only the size of the diameter but also the cross-sectional shape is changed to a triangle, square, circle, etc., or even if the shape is made different using a plurality of magnetic members, there is a pattern in which the electromagnetic coupling degree changes similarly. Each is detected differently. Further, the magnetic materials may be made different. Specifically, the magnetism may be made different in strength. In this case, it is possible to increase detection accuracy by detecting the temporal change.
 例えば、このような電磁結合度が変化するパターンを検出することで複数の指示具を識別する指示具識別部を、図1に示したマイクロプロセッサ30とペンダウン検出部40の間に設け、電磁結合度の変化した検出パターンに応じて複数の指示具を識別することが可能となる。 For example, an indicator identifying unit that identifies a plurality of indicators by detecting a pattern in which the degree of electromagnetic coupling changes is provided between the microprocessor 30 and the pen-down detector 40 shown in FIG. It becomes possible to identify a plurality of pointing devices according to the detection pattern whose degree has changed.
 このように、本発明によれば、指示具の構成として、基本的には2つの磁性部材のみを用いれば足りるため、非常に安価に指示具を製造可能となるため、例えば複数の指示具を用いた入力を行う場合であっても、システムコストを抑えることが可能となる。本発明の指示具では、従来の指示具のように指示具自体に電源や回路が不要であるため、例えば、位置検出装置を電子黒板や電子ホワイトボード等に適用し、複数の指示具を用いるようにした場合であっても、非常に安価に実現可能となる。 As described above, according to the present invention, it is basically sufficient to use only two magnetic members as the configuration of the pointing tool, and thus the pointing tool can be manufactured at a very low cost. Even in the case where the input is used, the system cost can be reduced. Since the pointing device of the present invention does not require a power source or a circuit as in the conventional pointing device, for example, the position detecting device is applied to an electronic blackboard or an electronic whiteboard, and a plurality of pointing devices are used. Even in this case, it can be realized at a very low cost.
 また、本発明の指示具には電源や回路素子が不要であるため、耐久性や信頼性にも優れるものである。 Also, since the indicator of the present invention does not require a power source or circuit elements, it is excellent in durability and reliability.
 なお、本発明の指示具は、上述の図示例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。 Note that the pointing device of the present invention is not limited to the illustrated examples described above, and it is needless to say that various changes can be made without departing from the gist of the present invention.
 10  指示具
 11  固定磁性部材
 12  可動磁性部材
 18  筐体
 19  弾性体
 20  位置検出装置
 21  検出面
 22  駆動部
 23  検出部
 30  マイクロプロセッサ
 40  ペンダウン検出部
 50  筆圧算出部
 220  駆動側ループ配線
 223  発振器
 224  切替器
 230  検出側ループ配線
 232  切替器
 233  アンプ
 234  同期検波部
DESCRIPTION OF SYMBOLS 10 Indicator 11 Fixed magnetic member 12 Movable magnetic member 18 Case 19 Elastic body 20 Position detection apparatus 21 Detection surface 22 Drive part 23 Detection part 30 Microprocessor 40 Pen down detection part 50 Pen pressure calculation part 220 Drive side loop wiring 223 Oscillator 224 Switch 230 Detection side loop wiring 232 Switch 233 Amplifier 234 Synchronous detection unit

Claims (8)

  1.  検出面の駆動側ループ配線群と検出側ループ配線群の電磁結合度の変化を検出することで、指示具の指示位置を検出可能な位置検出装置に用いられる指示具であって、該指示具は、
     磁性材料からなる固定磁性部材と、
     磁性材料からなり、前記固定磁性部材に対して移動可能に構成され、指示具が検出面に触れると前記固定磁性部材との間の距離が変化する可動磁性部材と、を具備し、
     前記固定磁性部材と前記可動磁性部材との間の距離の変化による前記電磁結合度の変化に基づき、指示具が検出面に触れたことを位置検出装置が検出可能であることを特徴とする指示具。
    An indicator used in a position detection device capable of detecting an indication position of an indicator by detecting a change in the degree of electromagnetic coupling between a drive-side loop wire group and a detection-side loop wire group on a detection surface. Is
    A fixed magnetic member made of a magnetic material;
    A movable magnetic member made of a magnetic material, configured to be movable with respect to the fixed magnetic member, and having a distance between the indicator and the fixed magnetic member that changes when the indicator touches the detection surface;
    The position detecting device can detect that the pointing device has touched the detection surface based on the change in the electromagnetic coupling degree due to the change in the distance between the fixed magnetic member and the movable magnetic member. Ingredients.
  2.  請求項1に記載の指示具であって、さらに、前記可動磁性部材が前記固定磁性部材に対して離れる方向に前記可動磁性部材に付勢力を与える弾性体を具備し、
     前記固定磁性部材と前記可動磁性部材との間の距離の変化による前記電磁結合度の変化に基づき、指示具が検出面に与える筆圧を位置検出装置が検出可能であることを特徴とする指示具。
    The indicator according to claim 1, further comprising an elastic body that applies a biasing force to the movable magnetic member in a direction in which the movable magnetic member is separated from the fixed magnetic member.
    The position detecting device can detect the writing pressure applied to the detection surface by the pointing tool based on the change in the degree of electromagnetic coupling caused by the change in the distance between the fixed magnetic member and the movable magnetic member. Ingredients.
  3.  請求項1又は請求項2に記載の指示具において、前記固定磁性部材及び/又は前記可動磁性部材は、フェライトからなることを特徴とする指示具。 3. The indicator according to claim 1 or 2, wherein the fixed magnetic member and / or the movable magnetic member is made of ferrite.
  4.  請求項1乃至請求項3の何れかに記載の指示具の指示位置を検出可能な位置検出装置であって、該位置検出装置は、指示具の前記固定磁性部材と前記可動磁性部材との間の距離の変化による前記電磁結合度の変化が所定の変化量よりも大きいか否か判定することで指示具が検出面に触れたことを検出するペンダウン検出部を有することを特徴とする位置検出装置。 4. A position detection device capable of detecting the indicated position of the pointing tool according to claim 1, wherein the position detecting device is provided between the fixed magnetic member and the movable magnetic member of the pointing tool. Position detection, comprising: a pen-down detection unit that detects that the pointing tool has touched the detection surface by determining whether or not the change in the electromagnetic coupling degree due to the change in the distance is greater than a predetermined change amount. apparatus.
  5.  請求項4に記載の位置検出装置であって、さらに、指示具の前記固定磁性部材と前記可動磁性部材との間の距離の変化による前記電磁結合度の変化量を検出することで筆圧を算出する筆圧算出部を有することを特徴とする位置検出装置。 5. The position detection device according to claim 4, further comprising: detecting a writing pressure by detecting a change amount of the electromagnetic coupling degree due to a change in a distance between the fixed magnetic member and the movable magnetic member of the pointing tool. A position detection device having a writing pressure calculation unit for calculating.
  6.  請求項4又は請求項5に記載の位置検出装置であって、さらに、複数の指示具による入力が検出可能であることを特徴とする位置検出装置。 6. The position detection apparatus according to claim 4, further comprising: an input by a plurality of pointing devices.
  7.  請求項4乃至請求項6の何れかに記載の位置検出装置であって、さらに、前記固定磁性部材及び/又は前記可動磁性部材の形状及び/又は磁性材料がそれぞれ相違する複数の指示具による入力に対して、前記電磁結合度が変化するパターンを検出することで複数の指示具を識別する指示具識別部を有することを特徴とする位置検出装置。 The position detection device according to claim 4, further comprising: an input by a plurality of pointing devices having different shapes and / or magnetic materials of the fixed magnetic member and / or the movable magnetic member. On the other hand, a position detecting device comprising an indicator identifying unit that identifies a plurality of indicators by detecting a pattern in which the degree of electromagnetic coupling changes.
  8.  請求項4乃至請求項7の何れかに記載の位置検出装置であって、さらに、検出面に積層される表示装置を有することを特徴とする位置検出装置。 8. The position detection apparatus according to claim 4, further comprising a display device stacked on a detection surface.
PCT/JP2009/002831 2008-07-15 2009-06-22 Indicator and position detection device WO2010007731A1 (en)

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