WO1999031635A1 - Crayon electronique - Google Patents

Crayon electronique Download PDF

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Publication number
WO1999031635A1
WO1999031635A1 PCT/IL1998/000614 IL9800614W WO9931635A1 WO 1999031635 A1 WO1999031635 A1 WO 1999031635A1 IL 9800614 W IL9800614 W IL 9800614W WO 9931635 A1 WO9931635 A1 WO 9931635A1
Authority
WO
WIPO (PCT)
Prior art keywords
pen
pen according
joint
operator
transducer
Prior art date
Application number
PCT/IL1998/000614
Other languages
English (en)
Inventor
Ran Shapira
Original Assignee
Ran Shapira
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ran Shapira filed Critical Ran Shapira
Priority to AU15751/99A priority Critical patent/AU1575199A/en
Priority to JP2000539457A priority patent/JP2002509308A/ja
Priority to EP98960071A priority patent/EP1048017A1/fr
Publication of WO1999031635A1 publication Critical patent/WO1999031635A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention relates generally to the conversion of written information to a digital format, and specifically to the conversion of written characters to digital signals.
  • PalmPilot Professional comprises a stylus and an electronic writing pad approximately 6 cm wide by 9 cm long. Data may be entered into the PalmPilot Professional using the stylus as a writing tool.
  • Apple Computer Inc. of Cupertino, CA. produce a device called an Apple MessagePad.
  • the MessagePad comprises a writing pad measuring approximately 10 cm by 20 cm, and a stylus. Handwriting may be inscribed on the MessagePad using the stylus, and a built-in processor translates the handwriting to standard digital characters by using built-in handwriting recognition software.
  • a hand-held pen is held by an operator so that a tip of the pen is fixedly positioned against any surface. While keeping the tip fixed against the surface, the operator "writes" with the pen by exerting a lateral force on the pen, preferably causing a joint within the pen to flex responsive to the force.
  • a transducer inside the pen measures flexure of the joint and/or the lateral force associated with such flexure. Measurements made by the transducer are received and analyzed by a processing unit, which preferably translates the measurements into one or more digital alphanumeric characters.
  • the operation of writing is considered to be a process of exerting a series of forces on a substantially fixed pen.
  • the processor preferably determines an effective position that would have been achieved by the pen due to the lateral force and analyzes a plurality of effective position data produced over time.
  • the present invention does not use a separate position sensing surface for determining the position of the tip of the pen, and does not require lateral motion of the pen. Therefore, the present invention is substantially more compact and can be operated in significantly smaller spaces than such systems.
  • the processing unit is contained inside the pen.
  • the pen further comprises a display, such as a liquid crystal display, mounted on an external surface of the pen.
  • a written character is translated by the processing unit to a corresponding digital character signal, and the signal is then transmitted to the display, so that the operator is able to see the character generated.
  • Fig. 1 is a schematic pictorial view of an electronic pen, in accordance with a preferred embodiment of the present invention
  • Fig. 2 A is a schematic cross-sectional view of a pen tip corresponding to the pen of Fig. 1;
  • Fig. 2B is a schematic exploded view of the pen tip of Fig. 2 A;
  • Fig. 3 is a schematic pictorial view of an electronic pen, in accordance with an alternative preferred embodiment of the present invention.
  • Fig. 4A is a schematic cross-sectional view of a pen tip in a non-operational state, corresponding to the pen of Fig. 3;
  • Fig. 4B is a schematic cross-sectional view of the pen tip of Fig 4A in an operational state, corresponding to the pen of Fig. 3;
  • Fig. 5 is a schematic pictorial view of an electronic pen, in accordance with a further alternative preferred embodiment of the present invention
  • Fig. 6 A is a schematic cross-sectional view of the pen of Fig. 5, taken along a line VIA
  • Fig. 6B is a schematic exploded view of the pen of Fig. 5;
  • Fig. 6C is a schematic view of a pressure sensor in the pen of Fig. 5, taken along a line VIC - VIC in Fig. 6B;
  • Fig. 7 is a schematic external view of an electronic pen, in accordance with an alternative prefeired embodiment of the present invention.
  • Fig. 8 A is a schematic cross-sectional view of the pen of Fig. 7;
  • Fig. 8B is a schematic exploded view of the pen of Fig. 7;
  • Fig. 9A is a schematic external view of a pen, in accordance with a further alternative preferred embodiment of the present invention.
  • Fig. 9B is a schematic cross-sectional view of the pen of Fig. 9A;
  • Fig. 10A is a schematic cross-sectional view of a pen, in accordance with an alternative preferred embodiment of the present invention.
  • Fig. 1 OB is a schematic exploded view of a pen head of the pen of Fig. 10 AL
  • Fig. IOC is a schematic cross-sectional view of the pen head of Fig. 10.A in the act of writing
  • Fig. 10D is a schematic sectional view of the pen head of Fig. IOC taken along a line XD - XD.
  • Fig. 1 wliich is a schematic pictorial view of a pen 20, in accordance with a preferred embodiment of the present invention.
  • Pen 20 is most preferably in the form of a cylinder having dimensions of the order of 15 mm diameter and 15 cm length, alternatively, pen 20 is in the foim of a polygonal prism of similar dimensions.
  • Pen 20 comprises a body 22 containing a pen head 28 whose operation is described in more detail hereinbelow.
  • body 22 mounteded on body 22 is a slideable switch 26, which activates or deactivates pen 20.
  • Pen 20 is most preferably connected to a computer 24 which receives signals generated by head 28 as an operator writes a character with the pen, and decodes the signals into a digital signal corresponding to the character, utilizing a processing unit 25, which is preferably comprised in a computer 24.
  • the pen may contain processing unit 25 and a memory in which the digital signals are initially stored while the pen is not connected to the computer; and the signals are later conveyed to the computer when a connection is made therewith.
  • the signals may be stored and/or output in the form of a curved line or drawing, corresponding to written characters or foims that would have been generated by the operator had he been using a conventional pen or stylus on a page or tablet.
  • Pen head 28 acts as a transducer converting lateral movements of the head to electrical signals.
  • Head 28 comprises a lever arm 52 having a substantially spherical section 48. Arm 52 is held in place by an aim holder 30, which mates with section 48, so that arm 52 and holder 30 operate as a ball-and-socket joint.
  • arm holder 30 is constructed from opaque plastic.
  • n industry-standard battery 34 mounted inside body 22, powers a plurality of lights 38 mounted on holder 30 when the battery is activated by sliding switch 26. Lights 38 are mounted so as to illuminate arm 52.
  • Aim 52 comprises two sections fixedly connected together: an opaque, substantially cylindrical rod 42, including section 48 described above, and a transparent, generally conical light concentrator 54.
  • rod 42 and concentrator 54 are made from plastic, and are cemented together.
  • Concentrator 54 is most preferably constructed from one piece of transparent plastic, such as Plexiglas, so that it has a generally conical form with a substantially hemispherical base 56.
  • Base 56 is coated with a light-reflecting material 44, such as aluminum, and over the light-reflecting material a covering 46, most preferably composed of an elastic material such as rubber, is placed.
  • Rod 42 comprises an optical fiber 40, wherein a first end 57 thereof is most preferably optically cemented to concentrator 54, and wherein a second, opposite end 58 thereof is substantially flush with an end 55 of rod 42.
  • .Arm 52 is constrained by a spring 36 placed between arm 52 and body 22, so that in the absence of an external force on arm 52 the arm remains in a substantially symmetrical, central position relative to holder 30.
  • Head 28 further comprises a two-dimensional photoelectric position sensing device 32, such as an S5991 position sensor produced by Hamamatsu Corporation, of Bridgewater, N.J.. Photoelectric device 32 generates signals responsive to a point of illumination thereon, whereby the signals are indicative of a position of the point of illumination, and the signals are transferred as described above to computer 24 (Fig.
  • Device 32 is positioned within body 22 so that when motion of arm 52 occurs, as described below, end 58 of fiberoptic 40 is close to, but not touching, surface 59. Most preferably, the internal walls of body 22 between array 32 and holder 30 are blackened to minimize light reflections.
  • Device 32 transfers a series of signals corresponding to the series of positions to computer 24, wherein processing unit 25 decodes the series of signals to produce the character written by the operator, by methods known in the art.
  • processing unit 25 decodes the series of signals to produce the character written by the operator, by methods known in the art.
  • computer 24 stores and/or outputs the character written as an industry-standard digital signal. It will be understood that contrary to standard writing methods using pens or styli .known in the art, there is substantially no linear movement of pen 20 of the present invention while a character is being written. In preferred embodiments of the present invention, the linear movement is substantially replaced by lateral movement of the pen head about the ball joint described hereinabove.
  • Fig. 3 is a schematic pictorial view of a pen 60, in accordance with an alternative preferred embodiment of the present invention. Except as described hereinbelow, pen 60 is constructed and operates substantially as does pen 20, and parts of pen 60 having the same numerals as pen 20 are substantially identical in construction and operation.
  • Pen 60 comprises a pen head 61, which acts as a transducer and generates electrical signals as described hereinbelow as an operator writes a character. Most preferably, the signals are transmitted to processing unit 25 of computer 24, wherein decoding of the signals into a digital signal corresponding to the character is made as described hereinabove.
  • Fig. 4A and Fig. 4B are respectively a schematic cross-sectional view showing pen head 61 of Fig. 3 in a non-operational state and a schematic cross-sectional view showing pen head 61 in an operational state, in accordance with a prefer-ed embodiment of the present invention.
  • Head 61 comprises a plate 68 which generates electrical signals responsive to the position of an end 67 of a rod 66 contacting plate 68.
  • plate 68 operates on the principle of capacitance measurement, as is .known in the art.
  • plate 68 operates on the principle of pressure measurement, as is .known in the art.
  • Rod 66 is comprised in a male section 64 of a lever arm 70.
  • Section 64 further comprises a cylinder 63 and a hemispherical writing tip 78, such that rod 66, cylinder 63, and tip 78 are fixedly connected together.
  • section 64 including rod 66, cylinder 63, and hemisphere 78, is constructed as a single unit from a metal such as stainless steel.
  • hemisphere 78 is coated with an elastic coating such as rubber.
  • Lever arm 70 further comprises a female section 62 which slideably receives male section 64.
  • section 62 and section 64 are held in position relative to each other by a spring 37 fixedly attached to both sections.
  • Section 62 comprises a tube 72, a substantially spherical section 74, and a generally conical section 76, fixedly connected together and having a central hole which receives male section 64.
  • female section 62 is formed in one piece from plastic.
  • Arm 70 comprising female section 62 and male section 64, is rotatably held in position by arm holder 30, substantially as described above for pen 20 (Fig. 2 A and Fig. 2B).
  • hemispherical writing tip 78 In the absence of pressure on hemispherical writing tip 78, end 67 of rod 66 does not contact plate 68.
  • hemispherical writing tip 78 In the operational mode of pen 60 (Fig. 4B), hemispherical writing tip 78 is brought into contact with and pressed lightly against any convenient surface 71, so that spring 37 is compressed and so that end 67 contacts plate 68, thereby generating a signal which most preferably is used by processing unit 25 as an initialization signal.
  • the pen can be lifted and replaced against surface 21 to provide repeated initialization signals, to signify, for example, the completion of a written character. Signals generated by plate 68, responsive to position changes of end 67 as a character is being written by an operator, are transferred to processing unit 25 of computer 24.
  • Fig. 5 is an external schematic view of a pen 80, in accordance with a preferred embodiment of the present invention.
  • pen 80 has similar dimensions to those of pen 20 described hereinabove.
  • Pen 80 comprises a body 86 containing a pen head 90 which acts as a transducer and whose operation is described in more detail hereinbelow.
  • Pen head 90 comprises a spring 100, whose function is described below.
  • Display 84 is a liquid crystal linear display capable of displaying a series of characters.
  • a processing unit 108 receives signals generated by head 90 as an operator writes a character with the pen. Processing unit 108 translates the signals into a digital signal corresponding to the character, and displays the character on display 84. As the operator writes subsequent characters, display 84 shows the sequence of characters written by the operator.
  • pen 80 further comprises a memory 110, preferably a non- volatile memory, which is utilized by processing unit 108 to store the sequence of characters written by the operator, and which may be accessed by computer 24 via a connector 112.
  • a slideable switch 82 mounted on body 86 is a slideable switch 82, which is able to activate the recall of the sequence of characters, and display the sequence on display 84.
  • Fig. 6A and Fig. 6B are schematic cross-sectional and exploded views, respectively, of pen 80, in accordance with a preferred embodiment of the present invention.
  • the cross- sectional view is taken along a line VIA - VIA in Fig. 5.
  • Pen 80 comprises a battery 104 which powers a printed circuit board 92.
  • Board 92 comprises processing unit 108 and memory 110, and drives display 84.
  • Board 92 receives signals from a circular pressure measuring disc 94, which is comprised in head 90 and is fixedly connected to body 86 and whose function is described in more detail hereinbelow.
  • Fig. 6C is a schematic cross-sectional view of disc 94, taken along a line VIC - VIC in Fig. 6B, in accordance with a preferred embodiment of the present invention.
  • Disc 94 comprises a plurality, preferably four, of pressure measuring transducers 106, fixedly positioned in a ring 93 which has a central hole 95.
  • Head 90 (Fig. 6A and Fig. 6B) further comprises a first ring 97 and a second ring 98, which are held apart by a spring 100, so that ring 98 presses against measuring disc 94.
  • a writing head 96 comprising a substantially hemispherical section 102, is fixedly connected to a far end of a rod 103.
  • a near end of rod 103 passes through hole 95 in disc 94 and has an enlarged end 105, so that rod 103 is rotatably held in place against disc 94 by the compression of spring 100.
  • Operation of pen 80 is initiated by placing section 102 against any convenient fixed surface, whereupon a "null" signal from disc 94 is sent to processing unit 108.
  • a series of lateral forces are exerted on body 86 to write the character.
  • the series of lateral forces cause rod 103 to rotate about hole 95, and thereby cause spring 100 to exert a corresponding series of forces on ring 98 and thus on pressure measuring disc 94, which accordingly produces a series of signals corresponding to the series of lateral forces.
  • the signals are decoded by processing unit 108, using the null signal as a reference, to give a digital signal corresponding to the character written.
  • unit 108 utilizes handwriting- recognition software .known in the art and stored in memory 110.
  • Processing unit shows the written character on display 84, and also stores the character in memory 110 from where it may be transferred to an external unit, for example a word-processing unit, via connection 112. If desired, pen 80 is able to write, display, and store a sequence of characters utilizing memory 110, and this sequence may be transferred from memory 110 as described above.
  • Fig. 7 is an external schematic view of an electronic pen 120, in accordance with an alternative preferred embodiment of the present invention. Except as described hereinbelow, pen 120 is constructed and operates substantially as does pen 80, so that parts of pen 120 having the same numerals as pen 80 are substantially identical in construction and operation.
  • Pen 120 comprises a head 122 wherein movement of the head is detected and transmitted to board 92 which then decodes the movement to generate a digital character as described above.
  • Fig. 8 A is a schematic cross-sectional view of pen 120
  • Fig. 8B is an exploded view of head 122 of the pen, in accordance with a preferred embodiment of the present invention.
  • Head 122 comprises a photoelectric device 124, preferably an array of photodiodes, which senses a two-dimensional position of a beam generated by a laser diode 134.
  • Diode 134 is fixedly mounted onto a near end 132 of a rod 128.
  • Rod 128 comprises a substantially spherical section 130, which mates with a housing 126 fixedly mounted to body 86, so that rod 128 rotatably moves in housing 126.
  • an operator positions hemispherical section 102 against any convenient surface, and writes a character by exerting a sequence of lateral forces on the pen and moving body 86 as described above.
  • the lateral forces and movement cause a corresponding sequence of rotations of rod 128 in housing 126, which vary the position at which the beam from laser diode 134 impinges on photoelectric device 124.
  • a sequence of signals from device 124 responsive to the sequence of positions of the beam, are generated by the device and transmitted to board 92, wherein the signals are preferably decoded to a digital signal corresponding the character written by the operator, as described hereinabove.
  • Fig. is an external schematic view of a pen 150, in accordance with an alternative preferred embodiment of the present invention. Except as described hereinbelow, pen 150 is constructed and operates substantially as does pen 120 (Figs. 7, 8A and 8B), so that parts of pen 150 having the same numerals as pen 120 are generally identical in construction and operation.
  • Pen 150 comprises a head 152 wherein movement of the head is detected and transmitted to board 92, which then translates the movement into a digital character as described above.
  • Fig. 9B is a schematic cross-sectional view of pen 150, in accordance with a preferred embodiment of the present invention.
  • Head 152 comprises a Hall detector 154, as is known in the art, which is fixedly connected to end 132 of rod 128.
  • Detector 154 senses a magnetic field generated by a coil 156 fixedly connected to body 86 of pen 150.
  • coil 156 may be replaced by a permanent magnet.
  • coil 156 generates a non-symmetrical magnetic field in a region 158, for example by fixedly positioning a piece of ferromagnetic material 160 in or adjacent to the region, so that magnetic field measurements made by detector 154 can be translated into a unique two-dimensional position of the detector.
  • Signals from Hall detector 154 are transferred to board 92, wherein a determination of the position of the detector is made.
  • an operator positions hemispherical section 102 against any convenient surface, and writes a character by exerting a sequence of lateral forces on the pen as described above.
  • the sequence of lateral forces causes a corresponding sequence of rotations of rod 128 in housing 126, and hence causes a corresponding sequence of positions of Hall detector 154.
  • a sequence of signals from the detector, responsive to the sequence of positions, are transmitted to board 92, wherein the signals are decoded into a digital signal corresponding the character written by the operator, as described hereinabove.
  • Fig. 10A is a schematic cross-sectional view of a pen 200, in accordance with a preferred embodiment of the present invention. Except as described hereinbelow, pen 200 is constructed and operates substantially as does pen 80 (Figs. 5, 6A and 6B), so that parts of pen 200 having the same numerals as pen 80 are generally identical in construction and operation. Pen 200 comprises a pen head 230, which acts as a transducer and generates electrical signals as described hereinbelow, as an operator writes a character.
  • Fig. 10B is an exploded view of pen head 230, in accordance with a preferred embodiment of the present invention.
  • Pen head 230 comprises a lever arm 220 which is rotatably held by a spherical opening 218, in a near end of arm 220, mating with a substantially spherical section 210 of a generally cylindrically-shaped arm holder 216.
  • a far end 204 of lever arm 202 is generally spherically shaped, and is placed against any convenient surface when an operator of pen 200 desires to write with the pen.
  • a disc 206 is fixedly attached to a rim 208 of arm 220, and arm 220 and disc 206 are held in a substantially symmetrical position by a spring 202 acting between disc 206 and a lip 224 of body 86.
  • Disc 206 is most preferably constructed from ferromagnetic material.
  • Arm holder 216 further comprises two linear optical encoder assemblies 232 and 234, as are .known in the art, for example optical encoders HEDR 8100, produced by Hewlett- Packard Inc., of Palo ⁇ to, California.
  • the linear optical encoder assemblies are mounted so that respective graticules 212 and 214 (shown in Fig. 10D) of the assemblies slide in grooves on the outside of holder 216.
  • the grooves are most preferably parallel to a general axis of symmetry 240 of pen 200, and are positioned so that their azimuthal separation is substantially equal to 90°, measured about axis 240.
  • graticules 212 and 214 have respective magnets 226 and 228 fixedly attached to the end of the sliders close to arm 220, so that they are magnetically held in place by disc 206.
  • Fig. IOC schematically shows pen head 230 during the act of writing
  • Fig. 10D which is a schematic cross-sectional view taken along line XD - .XD of Fig. IOC.
  • End 204 of arm 220 has been positioned against a surface S, and pen 200 has been moved generally vertically down, so that arm 220 tilts upwards.
  • disc 206 rotates in a clockwise direction, pushing magnet 226 and associated graticule 212 to the right.
  • the vertical component of the movement will correspond to motion of graticule 212
  • the horizontal component of the movement will correspond to motion of graticule 214.
  • linear motion of graticule 212 is optically encoded into a digital electrical signal by an emitter/receiver 222, against which graticule 212 moves.
  • linear motion of graticule 214 is encoded into a digital signal by a corresponding emitter/receiver 242.
  • Emitter/receiver 222 and emitter/receiver 242 comprise respective printed circuit boards, which are mounted on respective surfaces 250 and 252 cut into holder 216.
  • the digital signals are transmitted to board 92, wherein the signals are decoded into a digital signal corresponding to the character written by the operator, as described hereinabove.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

Crayon électronique (20) conçu pour générer un signal correspondant à l'écriture d'un opérateur, et comprenant un corps de crayon (22), que l'opérateur saisit et manipule d'une manière similaire à celle dont il l'utiliserait pour écrire sur une page. Une tête (28) de crayon, couplée au corps, est mise en contact avec une surface et est maintenue généralement stationnaire, en contact avec cette dernière, pendant que l'opérateur manipule le corps du crayon. Un transducteur (32) est couplé au corps du crayon, de sorte qu'il génère le signal en réponse à la manipulation dudit corps.
PCT/IL1998/000614 1997-12-16 1998-12-16 Crayon electronique WO1999031635A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU15751/99A AU1575199A (en) 1997-12-16 1998-12-16 Electronic pen
JP2000539457A JP2002509308A (ja) 1997-12-16 1998-12-16 電子ペン
EP98960071A EP1048017A1 (fr) 1997-12-16 1998-12-16 Crayon electronique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL12262597A IL122625A0 (en) 1997-12-16 1997-12-16 Smart pen
IL122625 1997-12-16

Publications (1)

Publication Number Publication Date
WO1999031635A1 true WO1999031635A1 (fr) 1999-06-24

Family

ID=11070978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1998/000614 WO1999031635A1 (fr) 1997-12-16 1998-12-16 Crayon electronique

Country Status (5)

Country Link
EP (1) EP1048017A1 (fr)
JP (1) JP2002509308A (fr)
AU (1) AU1575199A (fr)
IL (1) IL122625A0 (fr)
WO (1) WO1999031635A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015014389A1 (fr) * 2013-07-30 2015-02-05 Sabanci Üniversitesi Stylet sensible à la pression détectant une lumière à intensité modulée
GB2534032A (en) * 2015-01-07 2016-07-13 Promethean Ltd User interaction device
US9563288B2 (en) 2013-02-04 2017-02-07 Ricoh Company, Ltd. Pen-type input device and electronic information board system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4988837A (en) * 1987-12-25 1991-01-29 Wacom Co., Ltd. Position detecting device
US5285506A (en) * 1991-04-30 1994-02-08 Ncr Corporation Method of recording a handwritten message
US5389745A (en) * 1991-09-11 1995-02-14 Kabushiki Kaisha Toshiba Handwriting input apparatus for inputting handwritten data from unspecified direction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4988837A (en) * 1987-12-25 1991-01-29 Wacom Co., Ltd. Position detecting device
US5285506A (en) * 1991-04-30 1994-02-08 Ncr Corporation Method of recording a handwritten message
US5389745A (en) * 1991-09-11 1995-02-14 Kabushiki Kaisha Toshiba Handwriting input apparatus for inputting handwritten data from unspecified direction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9563288B2 (en) 2013-02-04 2017-02-07 Ricoh Company, Ltd. Pen-type input device and electronic information board system
WO2015014389A1 (fr) * 2013-07-30 2015-02-05 Sabanci Üniversitesi Stylet sensible à la pression détectant une lumière à intensité modulée
GB2534032A (en) * 2015-01-07 2016-07-13 Promethean Ltd User interaction device
EP3043241A1 (fr) * 2015-01-07 2016-07-13 Promethean Ltd Dispositif d'interaction d'utilisateur

Also Published As

Publication number Publication date
JP2002509308A (ja) 2002-03-26
AU1575199A (en) 1999-07-05
IL122625A0 (en) 1998-08-16
EP1048017A1 (fr) 2000-11-02

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