TWI426441B - Position indicating device - Google Patents

Position indicating device Download PDF

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TWI426441B
TWI426441B TW097102144A TW97102144A TWI426441B TW I426441 B TWI426441 B TW I426441B TW 097102144 A TW097102144 A TW 097102144A TW 97102144 A TW97102144 A TW 97102144A TW I426441 B TWI426441 B TW I426441B
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indicating device
position indicating
core
soft magnetic
magnetic metal
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TW097102144A
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TW200907774A (en
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Yasuyuki Fukushima
Hiroyuki Fujitsuka
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Wacom Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
    • G01D5/2073—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by movement of a single coil with respect to two or more coils
    • G01D5/208—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by movement of a single coil with respect to two or more coils using polyphase currents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/08—Cores, Yokes, or armatures made from powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F2017/048—Fixed inductances of the signal type  with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
    • H01G5/16—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of distance between electrodes

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Position Input By Displaying (AREA)
  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Powder Metallurgy (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

位置指示裝置
本發明涉及使用於例如與個人電腦所連接的數位轉換器之較佳的位置指示裝置。更詳細地說，其可以更容易的形成能夠減少磁性鐵芯破損問題、並提高耐衝擊性能，特別是軸直徑較細的位置指示裝置。
在通常的位置指示裝置中，位置檢測用的共振線圈設置於例如筆形形狀的前端附近(例如，參照專利文獻1)。但是，這樣的結構，由於位置指示裝置落下時的衝擊等原因，會有共振線圈所圍繞的鐵芯產生損傷的問題。
亦即，現有的磁性裝置中所採用的鐵芯是用軟磁性金屬成形的，此種的軟磁性金屬成形物對於衝擊等較為脆弱。因此在現有的位置指示裝置中，採用在共振線圈的周圍設置緩衝材料之類的結構，從而產生零件數增加、軸直徑變粗等問題。
另外，近些年來，利用位置指示裝置作為在PDA(Personal Digital Assistant，個人數位助理)等小型攜帶資訊終端機中，指示位置的手段的機會不斷增加。這種情況下，需要位置指示裝置做得更細。亦即，這種情況下，為能將位置指示裝置收納入PDA中，需要位置指示裝置足夠細。但是，現有的材質雖然可以做得很細，卻導致強度相應地變弱。因此，例如在不能承受落下的衝擊時或握持的力量不均衡時，會有位置指示裝置彎曲、鐵芯彎折 等問題。
另一方面，亦提案有將軟磁性金屬扁平粉末混合入有機黏合劑，作為該種磁性裝置鐵芯的材質，並通過射出成形等方法形成鐵芯(例如，參照專利文獻2)。利用這種方法已知可以增進成形加工性能。另外，利用這種方法所形成的鐵芯，藉由與樹脂混合也具有較強的耐衝擊等性質。
專利文獻1：日本專利特開2001－319831號公報 專利文獻2：日本專利特開2004－71845號公報
本發明係鑒於以上問題而提出，其課題是提供對於落下時等衝擊為較強的位置指示裝置之鐵芯。亦即，本發明的目的是減少使共振線圈所圍繞的鐵芯產生損傷的問題，並且不必設置緩衝材料等而使構造簡單化，同時位置指示裝置的軸直徑也可以做得較細。
為了解決上述課題，實現本發明的目的，申請專利範圍第1項所述的本發明位置指示裝置，至少具有1個線圈，並發送電磁波以指示位置；如此之位置指示裝置，其特徵在於，使用將軟磁性金屬粉末混合入樹脂黏合劑的組成物經成形後的構造物，作為線圈的鐵芯。
申請專利範圍第2項所記載的本發明位置指示裝置，具有位置檢測用的共振線圈、筆壓檢測用的可變電容值電容器和控制電路，並發送電磁波以指示位置；如此之位置指 示裝置，其特徵在於，根據可變電容值電容器的電容值控制共振線圈的共振，使用將軟磁性金屬粉末混合入樹脂黏合劑的組成物經成形後的構造物，作為共振線圈的鐵芯。
申請專利範圍第3項所記載的位置指示裝置，其特徵在於做成筆形的形狀，並將線圈的鐵芯設置在筆形形狀的前端附近。
申請專利範圍第4項所記載的位置指示裝置，其特徵在於做成筆形的形狀，並將線圈的鐵芯直接設置在筆形形狀的外殼體內部。
申請專利範圍第5項所記載的位置指示裝置，其特徵在於做成筆形的形狀，並使以筆形形狀前端作為一端的芯體設置成貫通線圈的鐵芯。
申請專利範圍第6項所記載的位置指示裝置，其特徵在於軟磁性金屬粉末是由以鐵(Fe)為母合金的軟磁性金屬扁平粉末占體積的25~65%而組成。
申請專利範圍第7項所記載的位置指示裝置，其特徵在於軟磁性金屬粉末的組成物係使用射出壓縮成形機，以使軟磁性金屬粉末在一定方向上定向，而射出壓縮成形。
利用申請專利範圍第1至7項所述的位置指示裝置，因為使用將軟磁性金屬粉末混合入黏合劑的組成物經成形後的構造物，作為線圈的鐵芯，可很容易將位置指示裝置的軸直徑做得較細，並減少鐵芯對於衝擊等時產生損傷的問題。另外，不需要緩衝材料等而可以使構造簡單化。
以下，參照附圖說明本發明的一個實施形態。圖1是表示適用本發明的位置指示裝置的一個實施形態的結構。
圖1中，以筆尖1作為一端的芯體2，貫通磁性鐵芯4而設置，其中，磁性鐵芯4被形成位置檢測線圈3的導電線所圍繞。該磁性鐵芯4是將軟磁性金屬粉末混合入有機樹脂等黏合劑的組成物，藉由例如射出成形方法而成形的構造物。而且，由於位置檢測線圈3圍繞於磁性鐵芯4，可以提高其檢測靈敏度。
另外，在芯體2的另一端設置有形成為圓頂丘形狀的導電性彈性構件5。並且，在導電性彈性構件5的附近設置扁平形狀的電介質6。該電介質6的一個面設置有既定面積的電極7，電介質6的另一面設置有引導電極8(lead electorde)。並且，使該另一面與導電性彈性構件5對向而配置電介質6。
另外，在電介質6的另一面所設置的引導電極8，從電介質6的另一面的大致中心處，經由電介質6的側面延長至電介質6的一面而設置。另外，來自電極7和引導電極8的引導線連接至電路基板9。另外，來自位置檢測線圈3的引導線也連接至電路基板9。此外，藉由將以上結構容置於外殼體10中而形成位置指示裝置。
於該結構中，在筆尖1施加筆壓，介由芯體2使設置在另一端的導電性彈性構件5按壓電介質6的另一面，導電性彈性構件5的前端形成扁平狀，對電介質6的另一面的 接觸面積則增加。另外，在導電性彈性構件5的前端與引導電極8保持接觸的狀態下，經由導電性彈性構件5之對電介質6的另一面的接觸面積發生變化，對應於該接觸面積，電極7和引導電極8之間的電容值也發生變化。
如此，施加於筆尖1的筆壓值將作為電極7與引導電極8之間的電容值變化而被檢測。因此，該電容值的變化，以設置於電路基板9例如圖2所示的電路而被檢測處理。亦即，在圖2所表示之方塊圖，是根據檢測出的筆壓值，而用以控制位置檢測線圈3所發送之信號的電路結構。
在該圖2中，以筆尖1作為一端的芯體2，貫通磁性鐵芯4而設置，其中，磁性鐵芯4被位置檢測線圈3所圍繞。在該芯體2的另一端設置有作為筆壓檢測部的導電性彈性構件5、以及具有電極7和引導電極8的電介質6；另外，與位置檢測線圈3並列而連接共振電容11，該共振電容11的兩端之間連接開關手段12。此外，位置檢測線圈3的一端通過電壓檢測電路13而連接於蓄電池14。
另外，從上述電極7和引導電極8所導出的引導線連接於筆壓檢測電路15，在該筆壓檢測電路15檢測出電極7與引導電極8之間的電容值變化，取出通過芯體2按壓的筆壓作為既定筆壓值。將該筆壓值提供給CPU(Central Processing Unit，中央處理單元)16。然後，將在該CPU 16所產生的信號提供給開關手段12，根據開關手段12的導通/關閉，進行包含筆壓值之預期信號的發送。
另外，儲存在蓄電池14的電力提供作為CPU 16的驅動 電源的同時，也提供給筆壓檢測電路15等的位置指示裝置的各個部分。因此，在該位置指示裝置中，由於驅動電源是通過位置檢測線圈3而提供，不必需要有線電源之供給或者乾電池等，可以實現簡便良好的位置指示裝置。另外，使用該電源也能夠產生更強的信號發送。
再者，此處作為筆壓檢測部的可變電容值電容器的結構，只有芯體2和扁平形狀的電介質6這兩者，是一種極端簡化的結構；其中，芯體2設置有另一端形成為圓頂丘形狀的導電性彈性構件5，電介質6在一面設置電極7而另一面設置引導電極8。而且，導電性彈性構件5可以使用矽導電橡膠或者加壓導電橡膠(PCR：Pressure sensitive Conductive Rubber)等。
另外，在該結構中，磁性鐵芯4是將軟磁性金屬粉末混合入有機樹脂等黏合劑的組成物，藉由例如射出成形方法而成形的構造物而形成。因此，比現有的軟磁性金屬的成形物更易於製作成形。而且，所形成的磁性鐵芯4具有比現有的軟磁性金屬的成形物更耐衝擊的優點，可以減少被位置檢測用共振線圈圍繞的鐵芯產生損傷的問題。因此，可以不必在鐵芯周圍設置緩衝材料等，使其結構簡化，並能夠使位置指示裝置的軸直徑變細。
另外，圖3是表示具備有本發明無線位置指示裝置20的座標輸入裝置的概略結構模式圖。該座標輸入裝置採用電磁授受方式，座標輸入面上的X軸方向和Y軸方向分別並列設置多個感測器線圈群。
在該種電磁授受方式的座標輸入裝置中，首先，藉由向處於發送狀態的感測器線圈送出電流，從而由感測器線圈發送交替磁場。由於該發送的交替磁場，使內置於位置指示裝置20的線圈或者共振電路受激共振，藉以由位置指示裝置20發送應答交替磁場。接著，停止由感測器線圈發送交替磁場，使感測器線圈進入接受狀態，由感測器線圈接受應答交替磁場。然後，藉由對各個感測器線圈所得到的接受信號的強度分佈進行信號解析，可以計算出位置指示裝置20的座標。
在此處，向處於發送狀態的感測器線圈而送出的電流，係使用高頻率信號。合適的高頻信號產生器21產生高頻信號。而且，為能發送高頻信號或者受取接受信號，而具有選擇各個感測器線圈的線圈切換手段。並且，為能切換各個感測器線圈的發送狀態與接受狀態，而具有發送/接受切換手段。線圈切換手段與發送/接受切換手段既有分別設置的情況也有共用的情況。並且，接受信號介由接受電路22傳送到信號解析部(未圖示)，並計算出位置指示裝置20的座標。
另外，圖4中是表示磁性鐵芯4以利用例如射出成形方法而成形時，所使用的裝置的結構模式圖。在該圖4中，將軟磁性金屬粉末混合入有機樹脂等黏合劑的組成物從加料漏斗101投入到射出裝置100。在該射出裝置100設置有熱源，將投入後的組成物熔化並從射出噴嘴102向模具200射出。
模具200製作成為與上述位置指示裝置的外殼體10內面大致相同的形狀。而且，該模具200的一端介由連接部201連接到射出噴嘴102，在另一端設置吐出部202，其中該吐出部202具有空腔用以容納射出的熔化組成物的多餘部分。從而，由射出噴嘴102射出的熔化組合物，在一部分吐出在吐出部202的狀態下充滿模具200，而冷卻固化。
另外，上述軟磁性金屬粉末是由以鐵(Fe)為母合金的軟磁性金屬扁平粉末占體積的25~65%而組成。採用該組成物可以實現強度更高、更加耐衝擊而不易損壞的位置指示裝置的鐵芯。而且，軟磁性金屬粉末組成物的成形，由於以樹脂黏合劑固定而使導磁率非常低。對其使用上述射出壓縮成形機器，藉以使軟磁性金屬扁平粉末沿一定方向定向，而可以提高導磁率。
亦即，如此所形成的磁性鐵芯4，將混合入黏合劑的軟磁性金屬粉末在朝向大致一定方向的狀態下固化，可以得到特性優良的產品作為磁性鐵芯。而且，磁性鐵芯4的形狀被製作成與位置指示裝置的外殼體10內面大致相同的形狀，可以使磁性鐵芯4的前端配置在極靠近位置指示裝置的筆尖1的位置。並且，可以使對來自檢測裝置側的磁場反應靈敏，從而提高位置檢測的精度。
還有，因為使用射出成形而成形後的構造物作為磁性鐵芯4，與現有的軟磁性金屬成形物相比有更好的耐衝擊性能。因此，可以減少被位置檢測用共振線圈所圍繞的鐵芯 產生損傷的問題，鐵芯周圍不需要設置緩衝材料等而可以使結構簡單化，位置指示裝置的軸直徑亦可以做得較細。另外，圖5是表示上述方式所成形的磁性鐵芯4的外觀圖。
本發明不僅只限定於上述實施形態，只要是在不脫離申請專利範圍所記載的本發明主旨的範圍內，當然包含各種未提及的變形例、應用例。
1‧‧‧筆尖
2‧‧‧芯體
3‧‧‧位置檢測線圈
4‧‧‧磁性鐵芯
5‧‧‧導電性彈性構件
6‧‧‧電介質
7‧‧‧電極
8‧‧‧引導電極
9‧‧‧電路基板
10‧‧‧外殼體
11‧‧‧共振電容
12‧‧‧開關手段
13‧‧‧電壓檢測電路
14‧‧‧蓄電池
15‧‧‧筆壓檢測電路
16‧‧‧CPU
20‧‧‧位置指示裝置
21‧‧‧高頻信號產生器
22‧‧‧接受電路
100‧‧‧射出裝置
101‧‧‧加料漏斗
102‧‧‧射出噴嘴
200‧‧‧模具
201‧‧‧連接部
202‧‧‧吐出部
圖1是表示適用於本發明的位置指示裝置的一個實施形態的結構圖。
圖2是表示適用於本發明的位置指示裝置的電路結構例的方塊圖。
圖3是說明具有本發明位置指示裝置的座標輸入裝置的模式圖。
圖4是說明適用於本發明的位置指示裝置的磁性鐵芯的形成的模式圖。
圖5是表示已成形的磁性鐵芯實例的外觀圖。
1‧‧‧筆尖
2‧‧‧芯體
3‧‧‧位置檢測線圈
4‧‧‧磁性鐵芯
5‧‧‧導電性彈性構件
6‧‧‧電介質
7‧‧‧電極
8‧‧‧引導電極
9‧‧‧電路基板
10‧‧‧外殼體

Claims (5)

  1. 一種位置指示裝置，其構成包括有：殼體；共振線圈，具備有磁性鐵芯；芯體，貫通上述磁性鐵芯，且一端側突出至上述殼體外側，而另一端側容置於上述殼體中；導電性彈性構件，配置於上述芯體的另一端側；以及可變電容值電容器，以上述導電性彈性構件施加於上述突出的芯體的外力進行按壓藉以使電容值發生變化；且經由上述共振線圈檢測出外部磁場，並發送對應於上述可變電容值電容器之電容值變化的磁場；如此之位置指示裝置，其特徵在於，上述磁性鐵芯係由混合入樹脂黏合劑(binder)的軟磁性金屬粉末所構成，上述軟磁性金屬粉末係沿上述芯體的一定方向定向而固化，並進一步藉由形成為沿著殼體前端內側的形狀，提升對上述共振線圈磁場的敏感度。
  2. 如申請專利範圍第1項之位置指示裝置，其中，其具有根據上述可變電容值電容器的電容值的變化來控制上述共振線圈的共振的控制電路。
  3. 如申請專利範圍第1項之位置指示裝置，其中，上述殼體被製成筆形的形狀，上述共振線圈的磁性鐵芯被設置在上述筆形形狀的前端附近。
  4. 如申請專利範圍第1項之位置指示裝置，其中， 上述軟磁性金屬粉末係由以鐵(Fe)作為母合金的軟磁性金屬扁平粉末占體積的25~65%而組成。
  5. 如申請專利範圍第1項之位置指示裝置，其中，上述軟磁性金屬粉末係以鐵(Fe)作為母合金的軟磁性金屬扁平粉末的組成物，上述軟磁性金屬粉末的組成物係使用射出壓縮成形機，以使上述軟磁性金屬粉末沿一定方向定向而射出壓縮成形。
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