EP1259935A2 - Dispositif de detection de positions - Google Patents

Dispositif de detection de positions

Info

Publication number
EP1259935A2
EP1259935A2 EP01907386A EP01907386A EP1259935A2 EP 1259935 A2 EP1259935 A2 EP 1259935A2 EP 01907386 A EP01907386 A EP 01907386A EP 01907386 A EP01907386 A EP 01907386A EP 1259935 A2 EP1259935 A2 EP 1259935A2
Authority
EP
European Patent Office
Prior art keywords
cordless
marker
detection
detector
board
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01907386A
Other languages
German (de)
English (en)
Inventor
Lars Bo Jensen
Dent-De-Lion Du Midi
Jorn Eskildsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOOL-TRIBE CONNECTOR APS
Original Assignee
Tool-Tribe International AS
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 Tool-Tribe International AS filed Critical Tool-Tribe International AS
Priority to EP01907386A priority Critical patent/EP1259935A2/fr
Publication of EP1259935A2 publication Critical patent/EP1259935A2/fr
Withdrawn legal-status Critical Current

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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0428—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual
    • 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
    • G06F3/03542—Light pens for emitting or receiving light
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
    • G02B5/124—Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet

Definitions

  • position detection devices that may be retrofitted are well-known within the art. These are traditionally fixed onto a board by means of suckers, velcro tape or the like. Such position detectors benefit from a high degree of flexibility due to the fact that they may be mounted and dismounted from a board quite easily without any operation of screws or similar fastening means.
  • a problem with the position detectors applying suction cups is that fastening means comprising simple suction cups gradually loose their grip over time, and sometimes even fall off the board. This problem has been dealt with by some detector types applying a very complex and large suction cup structure. This suction cup structure is more reliable than the above-mentioned detector, but the size of the position detector arrangement increases significantly when using such suction cup structures. Moreover, the applicable detector techniques are reduced to ultrasound.
  • the invention relates to a position detection system for a detection area according to claim 1, preferably a whiteboard, said system comprising means for detecting at least one position of at least one marker operating within said detection area, said system comprising means for storing a sequence of said detected positions in at least one memory arrangement, said memory arrangement comprising interfacing means () for exporting the stored positions or at least some of the positions.
  • the stored sequence may be displayed on a screen reflecting the picture drawn on the board.
  • the stored data may be displayed sequentially, i.e. illustrating the "file history" in the sense that the displayed picture is established in the same order as when the components of the drawing were made on the board.
  • the data may also be presented as slides, each slide representing the complete screenshot of a drawing made on the board.
  • a marker according to the invention may e.g. comprise a pen, a pointer an eraser or any similar user operable device.
  • the export of the position data may take place in several different ways within the scope of the invention.
  • the memory cartridge may e.g. be utilized for an easy plug- and play export of the obtained data to e.g. a computer.
  • the system may be used as a stand-alone system being operational within very few seconds due to the fact that the system requires no external control computer or the like.
  • the ideas illustrated on the board may instantly be captured in the memory and transferred to a display device and subsequently to a computer.
  • the present embodiment benefits from the fact that the ideas illustrated on e.g. a whiteboard are typically of a somewhat confidential nature.
  • the application of a memory dump cartridge ensures that the captured information may be kept in entrusted hands only in a simple way.
  • a removable cartridge represents a very simple and convenient way of establishing the needed interface between external computers and the position detecting system.
  • the memory card facilitates very quick booting of the system which may be very important for "capture your mind” purposes when users need to discuss important subj ect matters .
  • the interface means comprises a wireless interface (182; 184) adapted for wireless transmission of at least some of the data stored in said memory arrangement to an external processing unit, a further advantageous embodiment of the invention has been obtained.
  • the external processing may e.g. be a transportable desktop computer, a network server or the like.
  • the interface means comprises an IRD A interface or a Bluetooth interface
  • a further advantageous embodiment of the invention has been obtained.
  • An advantageous feature of the implementation of an IRDA or a Bluetooth interface between the system and an external unit is that such interfaces, especially IRDAs, are well supported by software and hardware suppliers.
  • Most computers are e.g. implemented with an IRDA interface.
  • the invention relates to a position detection system, according to claim 5 for a detection area, preferably a whiteboard, said system comprising means for detecting at least one position of at least one marker operating within said detection area, said system comprising cordless transmission means () arranged in relation to the detection area,
  • said at least one marker (13) comprising retroreflecting means (150) arranged for reflecting signals transmitted from said cordless transmission means () toward cordless detection means (),
  • said further transmission means (145) being adapted for transmitting coded communication signals () to said cordless detection means ().
  • Such coded information may e.g. determine the function of the marker, i.e. that the marker e.g. is a pen having a certain color and/or a certain tip property (line width), an eraser having a certain size and shape of the erasing area, etc.
  • the communication signals comprise at least one signal representing an on/-off condition of the said marker (13), a further advantageous embodiment of the invention has been obtained.
  • the invention relates to a marker (13) according to claim 7 for a position detection system, said marker (13) comprising retro-reflecting means (150) for reflection of electromagnetic light, said marker (13) comprising further transmission means (145) being adapted for transmitting coded communication signals () to cordless detection means ().
  • the activity of the active part of the pen i.e. the part of the pen which has to be powered from an internal data source
  • communication signals transmitted from the pen are not necessarily continuos. Transmission of e.g. on-off signals, color indication signals or the like may in fact not be performed very often which is certainly not the case with respect to position indicating signals that have to be transmitted on a more or less continuous basis during operation.
  • a very simple way of coding according to the present embodiment of the invention is by using coding implying that the transmission means are simply activated when the marker is in writing position and deactivated when the pen is lifted or shut off manually by the user.
  • said communication signals comprise at least one signal representing an on/-off condition of the said marker (13), a further advantageous embodiment of the invention has been obtained.
  • the invention relates to position detection system for a detection area according to claim 9, preferably a whiteboard, said system comprising means (130, 131) for detecting at least one position of at least one marker operating within said detection area,
  • cordless transmission means () arranged in relation to the detection area
  • said at least one marker (13) comprising retro reflecting means (150) arranged for reflecting signals transmitted from said cordless transmission means () toward cordless detection means (),
  • said retro reflecting means (150) comprising a pattern (150, 151) of retro-reflective material
  • said detection means (130, 131) for detecting at least one position of at least one marker comprising means for detecting the vertical position of the at least one marker (13) on the basis of recognition of said pattern (150, 151).
  • Such a pattern may e.g. be a bar code made in or from a retro reflecting material.
  • the detection means (130, 131) comprises at least one CCD-camera wherein the vertical position of at least one of the markers (13) is derived from the vertical position of the pattern on the CCD-camera, a further advantageous embodiment of the invention has been obtained.
  • a CCD array may e.g. be utilized for very specific recognition of patterns made in or by the retro-reflector for a particular purpose. Such an application would e.g. be the detection of the vertical position of the marker with respect to the marker/writing surface.
  • the invention relates to a marker (13) for a position detecting system according to claim 11, said marker (13) comprising retro-reflecting means (150) for reflection of electromagnetic light, said retro reflecting means (150) comprising a pattern (150, 151) of a retro reflective material.
  • the invention relates to a board system according to claim 12, preferably a whiteboard comprising a board (105), a wireless position detection system, said system being arranged for detection of the position of at least one marker (16) with respect the board,
  • said position detection system comprising at least two sensor arrangements being arranged so as to detect position indicating signals emitted from said at least one marker (16), and at least a portion of the wireless position detection system being at least partly encapsulated by the portion of said board comprising a galvanic conducting material.
  • the two sensor arrangement may be arranged within a common housing as long as they are mutually displaced so as to detect the position of a marker on the basis of position indicating signals emitted from the marker.
  • An important advantage of the system is that the effect of electric noise-inducing apparatuses, such as mobile phones, on the system may be reduced significantly due to the encapsulation of the components making it less vulnerable to electromagnetic noise.
  • the surface of the board and additionally attached encapsulating means arranged on the rear side of the surface of the board should form a complete Faraday cage or at least a portion of a such a cage in order to reduce induction of noise from the environment.
  • the environment of a typical write board is very noisy due to the fact that persons using such a board are typically equipped with all sorts electromagnetic noise generators such as mobile phones.
  • optimal electromagnetic decoupling or encapsulation may be crucial in several applications of the described kind due to the fact that the level of the position indicating signals is typically extremely low, thus implying very low obtainable signal/noise ratio.
  • the invention relates to a board system according to claim 13, preferably a whiteboard comprising a wireless position detection system, said system being arranged for detection of the position of at least one marker () with respect the board,
  • said position detection system comprising at least two sensor arrangements being arranged so as to detect position indicating signals emitted from said at least one marker (),
  • said at least two sensor arrangements communicating with at least one central processing unit () by means of electric connections (), at least a part of said electric connections being at least partly encapsulated by the portion of the board comprising a galvanic conducting material.
  • said board system comprising built-in power supply means (), said power supply means being at least partly encapsulated by means of said portion of said board comprising a galvanic conducting material, a further advantageous embodiment of the invention has been obtained.
  • the required electric power from the AC mains has been obtained due to the fact that most parts vulnerable to electric noise may be effectively isolated from the AC noise of the mains.
  • the board system comprises a board surface having a bend of less than 10 millimeters, preferably less than 5 millimeters in the normal direction, a further advantageous embodiment of the invention has been obtained.
  • the detection system arranged at the circumference of the board may be arranged closely to the detection surface, thus creating a minimum of errors due to alignments of the marker while also providing a detection area where the occurrence of errors is uniform.
  • the invention relates to a position or angle detection unit (112) according to claim 18 comprising a housing () mounted with fastening means (110), said fastening means being adapted to fastening the unit (112) onto a mounting surface () such as a whiteboard surface ()
  • said housing comprising position detection means () with at least one input portion (114) said input portion being adapted to guiding "light or sound beams" to a corresponding sensor arrangement (7) within the housing ()
  • said fastening means comprising magnetic fastening means ().
  • the senor may e.g. be an infrared diode, an ultrasound receiver, a laser light receiver or more complex sensor types such as CCD or PSD.
  • An input portion according to the invention may e.g. comprise a cylindrical lens.
  • the simple transducer types would typically be arranged in pairs.
  • the unit (112) comprises light receiving means (8), preferably infrared light receiving means (8), a further advantageous embodiment of the invention has been obtained.
  • the said input portion comprises optical lens means (114), a further advantageous embodiment of the invention has been obtained.
  • the magnetic fastening means are arranged with respect to an optical path between the input portion (114) and the position sensor arrangement (7) in such a way that the distance (d) between an input focal plane (115) and the mounting surface ()is less than 50 millimeters, preferably less than 20 millimeters when the unit is mounted to the mounting surface (), a further advantageous embodiment of the invention has been obtained.
  • an advantageous design of the marker may be applied, as the retroreflector or wave emitter on the marker may be located very closely to the active tip or surface of the marker, thus reducing alignment errors.
  • the magnetic fastening means comprise a plurality of magnets (110) arranged on the lower surface of the housing (), a further advantageous embodiment of the invention has been obtained.
  • the magnetic fastening means comprise one magnet arranged on the lower surface of the housing (), a further advantageous embodiment of the invention has been obtained.
  • One magnet having a large surface provides an effective magnetic attraction to the mounting surface.
  • the magnets of said magnetic fastening means are less than 10 millimeters, preferably less than 4 millimeters, a further advantageous embodiment of the invention has been obtained.
  • the unit comprises means for adjusting at least one of the magnets vertically, a further advantageous embodiment of the invention has been obtained.
  • the possibility of adjusting the magnet e.g. during calibration provides the possibility of mounting the unit with maximized attraction to the mounting surface.
  • the fastening means comprise at least one high friction member (111) arranged in such a way that at least one of the high friction members (111) is in contact with the mounting surface when the unit is attached to said surface by means of the said fastening magnets/means, a further advantageous embodiment of the invention has been obtained.
  • the unit may be fastened onto the mounting surface in a very advantageous way due to the fact that high-friction members ensure that the detection unit maintains its position when fastened.
  • This is particularly advantageous when the detector houses are connected by means of cables due to the fact that the cables tend to pull the units, thereby gradually implying an undesired rotation of the unit.
  • the high friction material may e.g. be natural rubber or other suitable materials.
  • the invention relates to
  • a position detector system comprising
  • At least one cordless detector unit (CDU1, CDU2, CDU3, ..)
  • At least one pointer device (PD1, PD2, PD3, PD4, ..)
  • CRC cordless communication center
  • said at least one cordless detector unit comprising rechargeable energy storage means (ESM)
  • ESM rechargeable energy storage means
  • the cordless detector units may now facilitate easy plug- and play when setting up the system, due to the fact that the detector units are now communicating mutually without need of a wired communication.
  • said at least one cordless detector unit (CDU1, CDU2, CDU3, ..) is integrated in the said at least one cordless communication center (CCC), a further advantageous embodiment of the invention has been obtained.
  • said system comprising at least one separate cordless detector unit (CDU1, CDU2, CDU3, ..) , preferably at least two separate cordless detector unit (CDU1, CDU2, CDU3, ..) ,
  • said system comprising at least one separate cordless communication center (CCC)
  • cordless detector units comprising at least one inductive coupling means (ICM1, ICM2) facilitating a recharging of the said rechargeable energy storage means (ESM), when coupling the cordless detector units (CDU1, CDU2, CDU3,..) to at least one external power source (EPS) , a further advantageous embodiment of the invention has been obtained
  • the detector units may be easily and securely recharged by simple coupling the detector units to the central power supply. Thereby, replacing of batteries, etc may be avoided.
  • an easy recharge coupling is highly desirable due to the fact that the detector units in a typical system, e.g. a retro-reflecting light based detecting system invokes a considerable power consumption.
  • the pointers When the said central power supply (CPS) is incorporated in a pointer holder (18), the pointers may be automatically recharged when they are put back in the pointer holder after use. Accordingly, the pointers may maintain charge during the usual operation, thereby avoiding annoying power downs when a user intends to use the system.
  • CPS central power supply
  • the mobile casing may typically be used as a combined charging and transporting bag.
  • At least one of the said cordless detector units (CDUl, CDU2, CDU3, ..) at least one of the said pointers (PD1, PD2, PD3,..) comprises means for measuring the power of the said respective rechargeable energy storage means (ESM) , a further advantageous embodiment of the invention has been obtained.
  • the individual battery operating devices may report that a recharge is necessary.
  • the means for measuring the power of the said respective rechargeable energy storage means ESM
  • PIS power indicative signals
  • a further advantageous embodiment of the invention has been obtained.
  • the cordless battery supplied units of the system may advantageously report the charge of the battery to the system control. Thereby, annoying power downs of single system units may be avoided, thereby increasing the user friendliness of the system.
  • the power management system may advantageously be incorporated in a traditional laptop or desktop computer receiving the established power indicative signals.
  • the system should clearly state a "battery low" to the user(s) of the system indicating that the one of the involved units needs a recharge or even point the specific critical device out to the user by means of visual or audio signaling.
  • the invention relates to a method of measuring the position of at least one marker (MA) in a detection area (DA), said detection area comprising at least two sub areas (SUBA)
  • each of at least two of said sub areas being associated to a corresponding detector system (DS1, DS2, DS3),
  • the at least one marker (MA) is outside the at least one selected sub-area(SSUBA) measuring the position of the at least one marker (MA) relative to at least one further selected sub-area (FSSUBA) of the sub-areas (SUBA) by means of the said corresponding detector system (DS1, DS2, DS3)
  • a large detector covered area may be obtained when applying relatively low transmitting power from the transmitters of the detectors systems.
  • the termination criteria may vary within the scope of the invention, but preferably, the process of measuring in the different sub-area's should be continued until the marker is found, and the specific position in a sub-area is established.
  • the method may be applied on both acoustic based or light based position detection systems, although light based postion detection systems are preferred.
  • the invention relates to a method of measuring the position of at least one marker (MA) in a detection area (DA), said detection area comprising at least two sub areas (SUBA)
  • each of at least two of said sub areas being associated to a corresponding detector system (DS1, DS2, DS3),
  • the corresponding detector systems (DS1, DS2, DS3) measures the position of a marker (MA) on the basis of electromagnetic light reflected from the said at least one marker (MA), said light being established by light transmitting means () ers comprised in the said corresponding detector systems (DS1, DS2, DS3)
  • the at least one marker (MA) is within the at least one further selected sub-area (SSUBA).
  • SSUBA further selected sub-area
  • the termination criteria may vary within the scope of the invention, but preferably, the process of measuring in the different sub-area's should be continued until the marker is found, and the specific position in a sub-area is established.
  • a detection area may be established in an advantageous way by combining two or several detector systems.
  • the risk of "cross-talk" between non-associated transmitters and detectors of different detector systems is reduced significantly.
  • the invention relates to a cordless position detection system comprising
  • PDU detection means for cordless detecting the position of at least one pointer (P; MA) relative to a detection surface (DS),
  • touch detection means adapted for estimating that at least one pointer (P) is in mechanical contact with the detection surface (DS), measuring and storing position indicative signals indicating the position of the at least one pointer on the surface (DS) when the touch means estimates that the pointer (P) is in mechanical contact with the detection surface (DS),
  • a marker may be regarded as a device leaving a visible indication that the detection surface was touched by the device, e.g. a ink/color left from a pen, a cleared area established by an eraser, chalk on a blackboard etc.
  • the detection means comprises ultra-sonic sensor means
  • said detection means establishing the position of the at least one pointer or marker on the basis of the measuring of ultra-sonic signals
  • the at least one marker comprises ultra-sonic transmitting means
  • a further advantageous embodiment of the invention has been obtained.
  • the detection means comprises electromagnetic light sensor means
  • said detection means establishing the position of the at least one pointer or marker on the basis of measuring of electromagnetic light signals
  • the electromagnetic light preferable comprises IR (infra red light)
  • At least one marker (MA) comprises electromagnetic light transmitting means
  • at least one marker (MA) comprises light reflecting means, preferably retro- reflecting means
  • at least one marker (MA) comprises light reflecting means, preferably retro- reflecting means
  • the measured electromagnetic light is electromagnetic light, preferably infra red light established by electromagnetic light transmitting means (IRT) and reflected by the light reflecting means, preferably retro-reflecting means, a further advantageous embodiment of the invention has been obtained.
  • IRT electromagnetic light transmitting means
  • the said touch detection means (TDM) comprises a touch sensitive foil arranged on the surface of the said surface (S) , a further advantageous embodiment of the invention has been obtained.
  • the said touch detection means comprises distance measuring means ()
  • the touch indicative signals are transmitted cordless to the said central data processing means (CDP) by means of electromagnetic light, a further advantageous embodiment of the invention has been obtained.
  • the touch indicative signal are preferably transmitted by means of modulated infra-red light.
  • the touch indicative signal further comprises pointer characteristics such as pen color, state of the pointer battery, signal indicating whether the pointer is a pen or an eraser, etc. , a further advantageous embodiment of the invention has been obtained
  • touch indicative means comprises capacitive measuring means for measuring the charge on the detection surface and deriving the said touch indicative signals on the basis changes in the measured charge
  • touch indicative means comprises means for measuring changes in the magnetic field over the detection area (DA) and wherein the at least one pointer comprises a magnet
  • touch indicative means comprises means for measuring changes in the magnetic field over the detection area (DA) and wherein the at least one pointer comprises a magnet
  • fig. 1 illustrates a whiteboard with position detection means according to the invention
  • fig. 2a illustrates another whiteboard with position detection means
  • fig. 2b illustrates a position detector
  • fig. 3 illustrates a position detector with an aperture arrangement
  • fig. 4a, 4b illustrates another variation of the aperture arrangement
  • fig. 5 illustrates a position detector with a beam splitter
  • fig. 6 illustrates a position detector known within the art
  • fig. 7 illustrates the same position detector seen from the side
  • fig. 8 illustrates a position detector according to the invention
  • fig. 9 illustrates another embodiment of the position detector
  • fig. 10 illustrates a whiteboard and a pen with a given alignment
  • fig. 11 illustrates the function of the pen with different alignments
  • fig. 12a, 12b illustrate a position detector seen from the rear and the side
  • fig. 12c illustrates another embodiment of the position detector seen from the side
  • fig. 13 illustrates a cross-section of a whiteboard with a built-in position detector
  • fig. 14 illustrates a whiteboard with built-in position detectors seen from the rear
  • fig. 15 illustrates an embodiment of the pen
  • fig. 16a illustrates an embodiment of the tip of the pen
  • fig. 16b illustrates an add-on detector surface
  • fig. 17a illustrates an control box built into a penholder
  • fig. 17b illustrates another embodiment of the control box built into a penholder
  • fig. 18a illustrates the elements of the position detection system schematically
  • fig. 18b illustrates an embodiment of the position detection system schematically
  • fig. 18c illustrates another embodiment of the position detection system schematically fig. 18d illustrates a part of the position detection system schematically and fig. 18e illustrates another embodiment of the above-mentioned part schematically, and where
  • fig. 19 illustrates the principal electrical components of a position detection system according to the invention.
  • fig. 20a-20c illustrates the different aspects of a cordless rechargeable system
  • fig. 21a to 22 illustrates a charger incorporated in the penholder
  • fig. 25 to 29 illustrates a further retro-reflective embodiment of the invention.
  • Fig. 1 shows an overview of the invention. It comprises a writeable board 10, preferably a whiteboard, and a left sensor 11 and a right sensor 12 mounted in the upper corners of the board and designed to detect the position of a whiteboard pen 13.
  • the sensors are preferably infrared (IR) sensors and can either be integrated in the board or mounted onto the surface of the board, by some mounting device, preferably magnets.
  • IR infrared
  • it comprises a control box with central processing hardware of the whole system built into a penholder 103, preferably mounted under the board or integrated in the board.
  • the sensors 11, 12 are connected to the penholder by cables 101, 102 either inside or behind the board or along the edges of the board.
  • the pen is provided with two or preferably four IR diodes for establishment of a fairly circular field around the pen.
  • the position sensors comprise two IR detectors whose mutual signal relation determines the angle of the incident light generated by the diodes 13 of the pen 14, as illustrated in figure 2a.
  • a detailed illustration of the construction of the angle detectors described above is provided in figures 2b and 3 below, illustrating two different embodiments of an angle detector.
  • the angle detector 12 comprises a box in which two IR sensors 8 have been installed and are mutually angled on two assembly sheets 7.
  • the assembly sheets 7 (and thus the sensors) are mutually angled at 90°.
  • the angle detector 12 is fronted by a curved cylinder lens 5 whose purpose it is to establish optical reinforcement by focusing on the incident IR light in the focus area of the lens against the sensors 8.
  • the incident light angle against the detector 12 is determined by comparing it with light picked up by the sensors 18.
  • This version of angle detection is also based on an evaluation of signals received by two IR sensors 17 and an aperture arrangement situated in front of the sensors comprising a plate 14 with aperture openings 16.
  • the two apertures establish the direction of the incident light against the sensors 17 despite the fact that they are mounted at the same level.
  • the illustrated version in figure 3 is preferable to the version illustrated in figure 2b as the installation at one PCB installation level reduces production costs just as the uncertainty of the direction of the sensors is reduced.
  • Figures 4a and 4b below illustrate yet another variation of the aperture arrangement illustrated above.
  • Figure 4a shows an aperture arrangement from the front and figure 5b illustrates an aperture arrangement from the side.
  • the preferred detector arrangement comprises a total of six detectors of which four comprise two aperture sets 41 and 42.
  • the upper aperture set is identical with the apertures 16 in figure 3 while the apertures 42 form an additional set of apertures with accompanying sensors 46.
  • the aperture set 41 is situated in front of a couple of sensors 45 and the aperture set 42 is situated in front of another couple of sensors 46.
  • the purpose of the additional aperture set 42/the couple of sensors 45 is to create a background estimate that may subsequently be subtracted from the signal received by the sets of sensors 44.
  • a significant variation in relation to the above-mentioned embodiments is that a horizontally placed set of detectors 52 has now been added.
  • a beam splitter 51 divides the incident light between the horizontally placed set of detectors and the original and vertical set of detectors (not shown in the figure).
  • a significant feature of this particular embodiment is that one single light beam is shared by a horizontal detector 52 and a vertical detector in such a manner that the optics are free of differential errors.
  • Venetian blinds which are a 3M standard product.
  • the sensors have been cross connected.
  • each corner detector is e.g. mounted with a light source arrangement of light sourc(es) in close proximity to a set of detectors.
  • the detection principle may e.g. be electromagnetic or based on ultrasound.
  • FIG. 1 shows an overview of the invention. It comprises a writeable board B, preferably a whiteboard, and a left position detection unit PDU1 and a right position detection unit PDU2 mounted in the upper corners of the board and designed to detect the position of a whiteboard marker MA.
  • the detection units PDU1, PDU2 can either be integrated in the board or mounted onto the surface of the board, by some mounting device, preferably magnets. Further the embodiment comprises a control box with central
  • the detection units PDU1, PDU2 are connected to the penholder PH by cables 101, 102 either inside or behind the board or along the edges of the board.
  • the applied pointers are now retro-reflective in the sense that the pointers are mounted with retro-reflecting materials in such a way that electromagnetic light illuminating the retro-reflecting materials is reflected in the same direction as it came.
  • the position of the pointers (or markers) may then be obtained by illuminating the detection area and measuring the obtained reflections.
  • the pointers comprises active reference signal transmitters.
  • the reference signals may indicate whether the pointer touches the detection area and e.g. the characteristics of the pointer (e.g. color, tip width, battery status, etc.)
  • Different types of pointers may e.g. be a pen or an erasor.
  • a marker will be referred to as MA, and an erasor as ER.
  • the detection unit PDU to be used with the retro-reflective marker MA is shown in detail in figures 25a and 25b.
  • the figure 25b shows a PDU attached to the upper left corner of a board B. It comprises a light sensitive array, a CCD-unit CCDU. In front of the CCD-unit is placed a visible light filter VLF, letting almost only infra-red light reach the CCD-unit. Further, a convex lens CL is placed in front of the CCD-unit CCDU.
  • the detection unit PDU also comprises two infra-red laser-diodes IRT1, IRT2, used to throw light at the retro-reflective material placed at the marker MA.
  • an optical lens system CL used to broaden out the light of the diodes, IRT1, IRT2, so the entire surface of the board B is illuminated with infra-red light.
  • Other embodiments with another number of laser-dioder, CCD-units or infra-red-sensitive diodes are within the scope of this invention.
  • Fig. 25a is enclosed to show the placement of the components within the detection unit PDU from another angle.
  • the bottom line of the PDU shown in fig. 25a is intended to be aligned with the surface of the board B.
  • the drawing shows the convex lens CL and the visible light filter VLF placed in front of the CCD-unit-array CCDA, so that everything getting into the CCD-unit, is both focused and filtered.
  • the drawing further shows the placement of the two laser-diodes IRT1, IRT2 below the CCD-unit, and also placed behind an optical lens system OL. Also the infra-red- sensitive diode IRR is shown at the drawing. Any possible rearrangement of the components within the PDU are considered to be within the scope of the present invention.
  • the laser-diodes IRT1, IRT2, are emitting very narrow-banded infra-red light.
  • One possible embodiment uses diodes emitting infra-red light with a wavelength of approx. 940 nm, and a bandwith about 40 nm. Any other light-emitting means are considered within the scope of this invention. It should be reckoned that the smaller the bandwith, the less power has to be used, and the more precise light is emitted.
  • the optical lens system OL placed in front of the laser diodes IRT1, IRT2, are comprised to broaden the light uniformly over the whole quadrant of a circle (90°).
  • the CCD-array CCD A comprised within the CCD-unit CCDU is an array of 1024 CCD-pixels CCDP, as shown at fig. 26. Another possible embodiment would use an array of 2048 CCD-pixels, a matrix of CCD-pixels, or any other sizes of CCD-arrays or CCD-matrices.
  • a preferred CCD-unit is the MIS 1024 from Futon Vision, but also components from Texas Instruments or other companies could be used within the scope of the invention.
  • the individual pixels CCDP's within the array CCD A are relative higher than the pixels contained within a 2048-pixels package.
  • the preferred component is a monochrome CCD-unit, which is very sensitive to most of the wavelengths of visible and infra-red light.
  • a filter VLF which especially surpresses visible light is placed in front of the CCD-array CCD A.
  • the markers MA or erasers ER are sending activation signals together with their type to the detection units PDU1, PDU2. And the detection units PDU1, PDU2 alternately floods the surface of the board B with infra- red light to detect the angle to the marker MA.
  • the overall communication protocol of the communication between the marker MA and the PDU's can be described as a one- way communication, where the marker MA is the sending device, and both the PDU's are receiving units.
  • the communication consists of 2 or 3 blocks of pulse- trains every 20 ms, when the marker is being used.
  • the pulse-trains always comprises 6 pulses send at a rate of 38 kHz.
  • the sending of one pulse-train therefore takes about 0.15 ms.
  • the retro-reflector-technique of the markers MA, and the low sending activity from the markers makes it possible to achieve a great power consumption performance within the markers.
  • the marker MA is not sending anything before its tip touches the surface of the board B. If the tip is pressed against the board, it begins it communication cycle. During one major time period of 20 ms, the marker MA is sending 2 or 3 pulse trains.
  • a time line is shown, at which the time is depicted in thousands of seconds, ms.
  • Beneath the time line is the status of the sending diodes at the marker.
  • Beneath the markers timing sequence is shown the status of the laser diode at the left PDU, LDL.
  • the marker MA sends one pulse train PTl. After 0.5 ms it sends another pulse train PT2.
  • the time between the first pulse train PTl and the second pulse train PT2 indicates the type of pointing device, in this case it is a marker. If the time interval between PTl and PT2 had been 0.8 ms, the device would be an eraser.
  • the detection units PDU1, PDU2 does nothing before they receives the two synchronization pulse trains PTl, PT2.
  • both CCD-arrays samples the background noise of light, BN.
  • the left laser diode LDL turns on, and at the same time the left CCD-array samples data to calculate the left angle ANL.
  • the right laser diode LDR, and the right CCD-array CCDR does the same thing, ANR.
  • the marker MA sends out a last pulse-train PT3.
  • the placement in time of this pulse-train is used to tell the PDU's the color of the current marker, or the status of the markers battery.
  • the last pulse-train PT3 is not always send, to preserve battery power.
  • the eraser is not using retro-reflectors, and are therefore different, as it has to send out the light for position detection itself.
  • the sequence is as follows. First the eraser sends out a first pulse-train PTl, and after 0.8 ms a second pulse-train PT2, telling the PDU's that this is an eraser. Then the PDU's both measures the background noise of light, BN. As the eraser is an active device, it then turns on its transmitting diodes for about 1 ms, to let the both the PDU's measure its angle at the same time, ANL and ANR. Then the eraser optionally transmits a pulse-train PT3, to tell it's size or battery status.
  • Fig. 29 shows the result of one timing cycle of 20 ms, at one of the PDU's.
  • the graph Gl shows the light intensity measured by the CCD-array CCD A during the background noise measurement.
  • the next graph G2 shows the light intensity measured during the laser-diode turned-on time.
  • the result G3 is achieved. This shows in which direction the strongest reflections are received. Such an measurement from both PDU's can be calculated into a relative position of the marker.
  • a first calibration of the PDU's is done during the production.
  • Light is send in to the CCD-array from angles of 0° and of 90°.
  • the CCD-pixels receiving absorbing the highest intensity in either way, are declared the outer pixels of the array. This way the boundaries, and thereto the middle of the CCD-array is found.
  • the distance between the PDU's is manually entered into the computer. Another way to obtain this distance would be to turn on some light emitting means at the corners of the pen holder, find their relative position, and calculate the distance between the PDU's from the known width of the pen holder.
  • One PDU can measure the light emitted from the other PDU, and from this measurement calculate the possible angular misplacement of itself.
  • Fig. 6 shows a detector box on a foundation 61, such as a whiteboard, mounted in the traditional manner.
  • the corner detectors may typically be mounted subsequently by means of fastening means relatively easy to mount and dismount.
  • a position detector system will typically comprise two detector boxes placed at a mutual distance.
  • Fig. 7 shows an example of mounting a detector box according to the known technique.
  • the cross-section illustration shows a corner detector mounted on a detector foundation 71, such as a whiteboard, by means of suckers 72.
  • the illustrated detector arrangement focuses on a remote point at a distance dl from the detector and at a certain level d2 from the foundation.
  • a problem with the known technique is that whiteboards are not always mounted in a very stable manner. This means that the whiteboard may move when written upon. Such movements may result in the mounted detector boxes swinging in relation to the foundation. Even seemingly insignificant angle changes of the detector box 70 will result in a significant displacement of the focus point in relation to dl.
  • the shown system has certain requirements to a pointer used on the writing surface, whether active or passive (e.g. retro reflective).
  • the signal received by the detector box 71 will vary (drop) significantly as the distance increases unless the retro reflector or sound/light emitter arrangement on the pointer is moved upwards in the direction of the focus line of point d2.
  • Fig 8 illustrates an embodiment according to the invention where the detector system has eliminated the above-mentioned problems by relatively simple means.
  • a detector box 80 has been fixed onto a magnetic foundation 81 by means of a magnet 82.
  • a magnet is capable of maintaining a fairly even signal level due to its unique capturing of the detector box 80 in the normal direction, even at a relatively significant distance from the detector box 80.
  • Fig. 10 illustrates a further aspect of the invention and shows a whiteboard 105 comprising an integrated position detection system.
  • the whiteboard 1105 comprises a planar surface 1104 adapted to writing.
  • the surface 1104 is metallic and electrically conductive.
  • the board comprises a rear plane 1103, preferably also an electrically conductive member.
  • the board 1105 comprises two detecting units 11, 12 mounted in two corners of the board.
  • the units 11, 12 communicate with a control unit 1100 via communication cables 1101 arranged in the board behind the planar surface 1104 in such a way that position indicating signals are established.
  • Both analogue and digital signal transmission may be applied via the cables 1101.
  • the units may moreover be powered by means of the cables 1101.
  • the control unit 1100 controls the retrieval of position indicating signals from the units 11, 12 and the transmission of position indicating data to external units such as computers or other data carriers.
  • the data is primarily exported for the purpose of displaying and modification in a computer.
  • the front surface 1104 and the rear plane 1103 form a Faraday cage together with the edge portions of the board.
  • screening may be obtained by a conducting front surface only.
  • a plane 104 illustrates the focal plane of the cordless detection means 11, 12.
  • Fig. 11 illustrates an important feature of the invention with reference to the above- mentioned focal plane 104.
  • a marker 16 writing on the surface 1105 of the illustrated whiteboard has an actual tip position 108.
  • the inclination of the marker with respect to the writing surface implies that position detection based on e.g. reflection or transmission from a point in the plane 104 on the marker elevated from the surface suffers from more or less significant errors when the marker is inclined with respect to the normal vector of the surface.
  • this error may be minimized simply by lowering the focal plane of the detection arrangement.
  • this lowering is obtained by reducing the thickness of the magnetic fastening means as much as possible while maintaining reliable fastening of the sensor arrangement, both with respect to other sensors and to the mounting surface.
  • a certain distance between the detection system and the foundation will often be necessary due to the foundation not being completely smooth or flat in its full size. Small variations or maladjustments in the foundation may cause errors in the position detection due to reflection from these. Normally, a distance more than 1 mm is preferable to ensure a measurement free of foundation errors. At the same, time the distance is preferably not in excess of 20 mm since this may cause problems when detecting the correct position of the pen.
  • Figure 12a shows an embodiment of the detector box 11 which may be placed directly on the foundation with a magnet or magnets 110 or be completely incorporated in the detector box as shown in fig. 12c.
  • the detector box 11 is constructed with a magnet or magnets 110 positioned closely to the sides 112, 113 of the detector box 11.
  • the usually centrally placed sensors 8 may be positioned at almost any preferred distance from the foundation.
  • the elevation can advantageously be obtained by having one or more magnets 110 extending out of the detector box 11 at a preferred distance as shown in fig. 12a and 12b.
  • the position of the detector box by changing the extension of the magnet or magnets.
  • errors from local elevation can be avoided since many whiteboards have a little metal sign in the upper left or right corner which conflict with the use of a detector box.
  • the right level of the detector box can be obtained by using a spirit bubble in a visible place on the box when the extension of the magnets is performed.
  • the magnet or magnets are replaceable by other magnets of different sizes.
  • the set of magnets may consist of a magnets of a size providing no elevation of the detector box and replacement magnets creating an elevation of e.g. 1 mm.
  • a detector box When using one or more magnets to fasten a detector box onto a foundation, it is important that the magnet or magnets are placed correctly in the detector box to ensure steady and durable fastening.
  • the shape of the detector box following the sides of the whiteboard would usually be preferable.
  • Such a detector box is illustrated in figs. 12a-c and will create a detector box 11 with a triangular shape of the sides 112, 113 and with three corners. To ensure steady and durable fastening of the position detector by placing a magnet 110 is placed in each corner.
  • two magnets may be used in two of the corners ensuring a durable but less steady fastening.
  • one larger magnet is also possible if placed centrally on the detector box.
  • fastening with one or more magnets on the detector box may be enhanced by one or more areas 111 of silicone, rubber or another material with a sticky effect.
  • the areas 111 will be similar in size or a little larger than that of the magnet or magnets to ensure optimal fastening of the detector box.
  • the areas may be placed around a magnet or between magnets and close to the sides 112-113. There will normally be at least two areas in order to strengthen the fastening in at least two directions.
  • the film has a sticky effect besides the magnetic effect to ensure fastening onto the foundation.
  • the film may be used in different patterns and areas on each detector box and the shape of each area may be designed in such a way that resistance against forces from a particular direction may be enhanced significantly if so desired.
  • the film generally has the advantage of being easy to use in a manufacturing process. At the same time, the thickness of the film is approx. 1 to 2 mm which provides a reasonable distance between the detector system and the foundation.
  • a whiteboard is constructed with a part of the detector box 120 being integrated in the whiteboard.
  • the part of the detector 120 box which is integrated is placed on the rear side 124 of the whiteboard and may e.g. consist of sensors, sensor controllers and communication units.
  • the connection from a sensor to the front side may be obtained by using an optical fiber 121.
  • a prism or a mirror 123 is used in continuation of the fiber 121.
  • a connector 122 is also used to hold the fiber in its place in relation to the whiteboard and the prism or mirror 123.
  • the visible part of the detector box may be narrowed down to only the prism or mirror 123. This means that the visible part can be less than 20 mm in size and generally take up very little space compared with standard detector boxes.
  • connection may consist of a light source on one side through air to a mirror or a prism 123 on the front side of the whiteboard.
  • the light source can be placed on the front side with an electrical connection through a hole to the rest of the detector on the rear side or the detector may be completely exposed on the front side. In these cases, it is possible to lower the level of the detectors from the foundation by countersinking the detector boxes in the whiteboard.
  • a controller box 103 with a power supply in separate place away from the detector boxes 130, 131 and only transmit the necessary power to the detector boxes through a connection 132.
  • the measured data from each of the detector boxes are transmitted to the controller box through the same or separate connections in a similar manner. It is hereby possible to minimize the number of elements in the detector box 130, 131 to the detector parts and a communication part which transform the weakly measured data to packets of data ready for safe transmission to the controller box 103.
  • the measured data is shielded from electric or magnetic fields during transmission, it is possible to build detector boxes which only comprise the necessary detector systems.
  • the communication part will not be necessary due to the shielded transmission.
  • One way to shield the detector boxes, the transmission and the controller box is to ground the whiteboard itself 133. Small openings in the whiteboard, e.g. in connection with the optical fibres, have no practical influence on the shielding of the system and especially the detector boxes.
  • connection 132 between a detector box 130, 131 and the control box 103 will be a four-wire connection where two of the wires are power lines and the remaining two are communication lines. However, if the whiteboard is grounded, one of the power lines is no longer necessary and can be removed.
  • the position detector system may be operated by a wireless communication device that may e.g. be incorporated in a position detector box or in the whiteboard itself in such a manner that it communicates wirelessly with a control box, a display and/or an external data processing unit.
  • Figure 15 illustrates an embodiment of a pen 13 which can be used together with the detector position system.
  • the pen has a compartment 146 designed for containing and keeping a standard whiteboard pen 143.
  • the standard pen 143 is loaded into the compartment 146 through an opening 144 and the opening is hereafter closed by a door (not shown on figure 15).
  • the point 147 of the standard pen 143 has access to the outside of the pen 13 through an opening at the bottom of the pen. When not in use, the bottom is sealed off by a cap.
  • the top of the standard pen 143 lies under a switch 142.
  • the switch 142 is normally disconnected. However, if the standard pen 143 is pressed towards the switch, the switch will connect a circuit. The pressure of the standard pen 143 towards the switch will normally occur when the point 147 of the standard pen 143 is pressed against e.g. a whiteboard.
  • a microprocessor or a similar component on a circuit board 141 detects the current and activates a number of LEDs 145 through the wire 140.
  • the LEDs are placed symmetrically around the lower part of the pen 13 ensuring that light is radiated in all directions from the pen.
  • the light from the LEDs 145 will be detected by the sensors in the detector boxes and a position detection will take place. At the same time, it is possible to recognise the standard pen by e.g. its colour.
  • the marker may be mounted with a retro-reflective material.
  • the retro-reflective material is adapted to reflecting light emitted from external light emitters to external position detector arrangements arranged on the writing surface.
  • the arrangement of LEDs may then be adapted to transmit coded information to a corresponding external receiver, the information determining the type of the marker; pen, eraser, etc; and the dynamic activity of the marker; i.e. is it writing on a board or it is elevated with respect to the surface (on/off). If the pen is semi-active, patterns, codes or retro-reflectors on the pen may be omitted.
  • one or more batteries 140 have been placed which power the electric components in the pen.
  • the electric circuits are removed from the pen.
  • the lower part 150 of the pen is provided with a number of horizontal 152 and vertical 151 stripes. It is hereby possible for the detector boxes to "see” the stripes and determine the position and height of the pen proportionally to the whiteboard. With the horizontal stripes 152, it is possible to determine the distance of the pen from the whiteboard and hereby determine whether the user of the pen is actually touching the whiteboard with the pen.
  • the markings at the bottom of the pen 13 can also be polarised filters ensuring that only a part of the light is reflected.
  • an add-on detector surface 156 with horizontal 154 and vertical 155 markings is illustrated.
  • the add-on detector surface 156 will preferably be provided with a sticky layer on the rear side.
  • the user can hereby place the surface on a standard whiteboard pen and use it as a pen in a detector position system such as the invention.
  • FIG 19 a diagram illustrates a preferred embodiment of a detection position system according to the invention.
  • the system comprises 5 primary components:
  • A/D converter 221 preferably a AD9280 from Analog Devices or TLC5510A from Texas Instruments.
  • Microcontroller 222 preferably an ATmega 161 from the company Atmel.
  • CPLD Complex Programmable Logic Device 223, preferably a CY37032 from the company Cypress.
  • SRAM Synchronous Random Access Memory
  • a microcontroller 222 with device number 90S8515 from Atmel may be chosen.
  • the reason for chosing this controller is its good external memory interface. This is important as it is necessary to be able to save all data from the CCD-array 220 as quickly as possible.
  • the microcontroller 222 is responsible for performing the following tasks:
  • the microcontroller 222 is connected to an IR- receiver 225.
  • the pen touches the board it sends out an IR-signal received by the IR-receiver 225 which is sent to the microcontroller 222.
  • the IR-signal from the pen can either be a start-signal telling the microcontroller to start and keep measuring until a stop-signal is received, or it can be a continuous signal, telling the microcontroller to measure for as long as it is receiving the signal.
  • the microcontroller 222 To make a measurement of a position, the microcontroller 222 initially reads and saves one set of data from the CCD array 220 with the light source, e.g. a laser- diode, turned off. The laser-diode is then turned on and makes a new reading of the CCD array 220. After the two readings, the microcontroller 222 starts calculating the position. Initially, it calculates the difference between the two readings. This cancels the effect of disturbing IR-light emissions from the environment. From the result of this subtraction, the microcontroller 222 then calculates the position of the CCD array 220 by reflection from the pen, thereby determining the angle of the pen's position in relation to the CCD array 220. This angle is calculated with a precision of 12 bit from the data of the CCD array 220 which has a resolution of only 10 bit.
  • the light source e.g. a laser- diode
  • the clock signal from the microcontroller 222 is altered from 8 MHz to 2 MHz in the CPLD 223 while an inverted version of the signal is also possible whereby the sampling of data in the A/D converter 221 will become more accurate seen from a time perspective. Since the microcontroller 222 can reset the counter in the CPLD 223 and the microcontroller and the counter share the same clock signal, the microcontroller always knows in which time period the counter is.
  • Position data obtained by the CCD array 220 is directed to the A/D converter 221 where the signal is sampled into digital form.
  • the A/D converter has a connection to the SRAM 224 which makes it possible to transfer the data from the CCD array through the A/D converter to the SRAM.
  • the microcontroller 222 enables the A/D converter 221 by forwarding an A/D enable signal to the A/D converter 221.
  • the signal also provides the CPLD 223 with the information that the microcontroller 222 cannot obtain a connection to the data bus between the CPLD 223 and the SRAM 224.
  • the microcontroller 222 starts to write data to the SRAM 224.
  • the microcontroller 222 is only in control of the address and writing signals. The position data itself comes from the A/D converter 221.
  • the CPLD 223 functions as an address/data latch and ensures that data can be written to and from the SRAM 224.
  • the CPLD 223 does this. With the WR and RD signals, it is decided whether data from the SRAM 224 is to be transferred to the microcontroller 222 or transferred from the microcontroller 222 to the SRAM 224 by enabling the necessary outputs in the SRAM 224 and/or microcontroller 222.
  • the NOP command demands 1 clockcycle and STO demands 3 clockcycles since storing in an external memory takes place.
  • microcontroller 90S8515 50% of the code memory (8 kB) will be used to transfer data from the CCD array, thereby leaving 4 kB for calculation and communication with the control box. If the Atmega 161 (16 kB) is chosen, 12 kB can be used for calculation and communication with the control box.
  • the program memory of the 90S8515 is based on flash-technology which gives the ability to update the program memory. This means that it is possible to alter the program until the controller is placed inside the detector box. However, the user has no ability to update the program as the 90S8515 cannot alter its own program memory. Another disadvantage of the 90S8515 is that it has no built-in multiplier. This means that it is necessary to program a multiplier if any multiplication is to be made such as e.g. filtering calculations. Thus, the software will be slowed considerably.
  • microcontroller ATmegal61 If it is necessary to let the user download software, update and install it himself, or it is necessary to perform hard calculations comprising multiplication, it is possible to use the microcontroller ATmegal61, instead.
  • This microcontroller has built-in hardware multiplication circuits which e.g. ease time-consuming filtering algorithms while also having the ability to alter its own program memory. If a 90S8515 is used, the microcontroller must go back to the manufacturer for reprogramming of firmware. It is also possible to use an ATmegal63. It is similar to the ATmegal ⁇ l but has a built-in AD-converter which has no usage in this application. This makes the use of the ATmegal63 a more expensive solution.
  • the CPLD 223 has a counter/divider which can divide with 3, it is possible to do without the NOP command and thereby save 50% of the code memory.
  • the needed code memory will then only be 2 kB and the frequency of the clock signal will increase to 2,67 MHz.
  • the program code will approximately be as follows:
  • Fig. 17a shows a detailed view of an embodiment of a control box built into a penholder 163 A. It comprises a number of slots 161 A in which the pens 13 can be placed.
  • the penholder 163 A comprises a digital display 162, an On Off button 163, and a number of additional buttons 164.
  • the penholder 163 A further comprises a slot 165 A for inserting a memory card 165C such as a Flash-RAM-card. It also comprises a button 165B for releasing the memory card 165C, a socket 166 for attaching the penholder 163 A to a power supply such as a transformer, and a socket 167 for attaching the penholder 163 A to a computer network.
  • Fig. 17b shows another embodiment of the penholder 173B. It comprises a number of clamps 17 IB in which the pens 13 can be placed. It further comprises an On/Off switch 163, a socket 165 A for a memory card 165C, such as a Flash-RAM-card, and a button 165B for releasing the memory card 165C.
  • the penholder 173B further comprises a socket 166 for attaching a wire from a power supply, such as a transformer, and a communication interface 178, such as an infra-red transceiver, a radio frequency transceiver or a socket for serial or parallel communication. Further, it comprises an array of light-emitting diodes 179 for showing the amount of used memory in relation to the memory card 165C.
  • Communication with a computer or another external device can be established by the use of parallel communication such as through the printer port of the computer, by the use of serial communication such as through the serial port or USB port of the computer, by the use of infra-red technology such as the IrDA standard, by the use of radio communication such as the Bluetooth standard communicating at approx. 2GHz, or by attaching the penholder to the computer network and provide it with an IP-address and thus operate as a network unit.
  • the memory card 165C is preferably a Flash-RAM-card with a memory amount of 16 Mbit. With this memory size, it is possible to write effectively at the board for about 2 hours and 20 minutes. Usually, the pen is only in use a fraction of the time during which a meeting lasts, e.g. 1/5 of the time, which leads to a meeting duration of 11 hours and 40 minutes.
  • the penholder can be equipped with a display 162 or an array of light-emitting diodes 179 or some other visible or audible indication such as a beep when all memory is used.
  • buttons 164 provide the user with access to further functions of the system. These functions are not necessary but can be implemented for the convenience of the user. Functions which could be advantageous are e.g. a print-function to send the current board image to a local or a network printer, an erase-function to erase the memory card when starting a new session, a send-function to send the current board image to some predefined e-mail-addresses or to all connected users, or an upload function to initiate transmission of memory data to a connected computer. Many other functions are imaginable within the scope of the invention.
  • buttons are placed on the controller box instead of on the sensors, as known from some systems, is that there is no risk of moving or decalibrating the sensors by pushing a button.
  • a further functionality which may be implemented in relation to the penholder is a display upon which the user writes his notes before the meeting, and then reads his notes from the display instead of having paper notes during the meeting.
  • a further improvement of the penholder may be obtained by using rechargeable batteries for the pens 16, and by incorporating some metal connectors in the pen slots or cramps in the penholder 161A,171B and by including an appropriate charging circuit, so that the pens 13 can be recharged when not used.
  • the batteries in the pens 13 can be exchanged with some kind of circuit with the ability to store a small amount of power which will keep the pen sending as long as it is off the penholder.
  • Figure 18a shows elements of a detector position system according to the invention schematically.
  • the system consists of at least two detectors 11, 12, detectors A and B, which transmit the measured signals of a pen 13 to a controller unit 180 and receive a control signal from the controller unit 180.
  • the controller unit has a microprocessor to convert the measured signals into position signals which can be used by another apparatus connected to the controller unit.
  • the apparatus is connected to the controller unit 180 through an external interface 181.
  • the connections may be wired as well as wireless.
  • the connections can e.g. be between the controller unit and a PC, wireless 182 or wired 183, or an IP-network, wireless 184 or wired 185.
  • a central power supply 196 is placed within the controller unit 180 and supplies all elements of the unit with the necessary power. At the same time, the power supply 196 supplies power to the elements of the detector box 11, 12 over a wire connection. The detector boxes will therefore not have an external power supply.
  • FIG. 18c another detailed embodiment of a detector position system according to the invention is illustrated.
  • the wires between the detector boxes 11, 12 and the central controller 191 are shielded against magnetic or electric fields from the exterior. This means that the communication units 190, 192, 193 are no longer necessary because the position data can be transmitted directly from the detector controller 194 through the shielded wires 200 to the central controller 191.
  • a central power supply 196 is placed within the controller unit 180 which supplies all elements of the unit with the necessary power. At the same time, the power supply 196 supplies power to the elements of the detector box 11, 12 through a wire connection. The detector boxes will therefore not have an external power supply. Since the detector boxes 11, 12 and the controller unit 180 in this embodiment have fewer elements than the previous embodiment, there are also fewer elements to supply with power.
  • fig. 18d a detailed embodiment of a part of the detector position system according to the invention is illustrated. It shows the communication of data from the controller unit 191 to an internal memory unit 197 and further through an external interface 181 to external units e.g. a PC.
  • external units e.g. a PC.
  • FIG. 18e another detailed embodiment of a part of a detector position system according to the invention is illustrated. It shows the communication of data from the controller unit 191 directly to an external interface 181.
  • One or more external apparatuses or units may be connected to the interface 181, including a memory unit 220.
  • the memory unit 220 is similar to the internal one in fig. 18d. By making it an external memory unit, it is possible to store position data on the memory unit 220 and disconnect it from the interface 181.
  • the disconnected memory unit 220 can be carried to another location and transferred to e.g. a PC.
  • Fig. 20a-20c illustrates the different aspects of a cordless rechargeable system.
  • Fig. 20a-c illustrates a detector system comprising
  • At least one cordless detector unit (CDUl, CDU2, CDU3, ..)
  • At least one pointer device (PD1, PD2, PD3, PD4, ..)
  • At least one cordless communication center said at least one cordless detector unit (CDUl, CDU2, CDU3, ..) comprising rechargeable energy storage means (ESM),
  • ESM rechargeable energy storage means
  • the position detector system may comprise said rechargeable energy storage means (ESM) comprising at least one rechargeable battery means (RBM).
  • ESM rechargeable energy storage means
  • RBM rechargeable battery means
  • the rechargeable energy storage means may comprise at least one rechargeable capacitor means (RCM).
  • the position detector system comprising according to any of the claims 27 to 29,
  • the cordless detector unit (CDUl, CDU2, CDU3, ..) may be integrated in the said at least one cordless communication center (CCC).
  • the position detector system comprising according to any of the claims 27 to 30 may comprise at least one separate cordless detector unit (CDUl, CDU2, CDU3, ..) , preferably at least two separate cordless detector unit (CDUl, CDU2, CDU3, ..) ,
  • said system comprising at least one separate cordless communication center (CCC)
  • the position detector system may comprise a communication center (CCC) communicating with external data processing means (C) be means of cordless communication (CC2).
  • C communication center
  • C external data processing means
  • CC2 cordless communication
  • the position detector system may comprise at least one of said cordless detector units comprising at least one inductive coupling means (ICM1, ICM2) facilitating a recharging of the said rechargeable energy storage means (ESM), when coupling the cordless detector units (CDUl, CDU2, CDU3,..) to at least one external power source (EPS)
  • the position detector system may at least one of said cordless detectors and/or comprising at least one charging control circuit (CHOC), adapted for controlling the charging of the said rechargeable energy storage means (ESM)
  • Position detector system may comprise said system comprising a central power supply (CPS) adapted for recharging of the at least one cordless detector units (CDUl, CDU2, CDU3, ..).
  • CPS central power supply
  • Position detector system may comprisw a central power supply (CPS) adapted for recharging of the at least one cordless detector units (CDUl, CDU2, CDU3, ..) by means of inductive coupling means () comprised in the said central power supply (CPS).
  • CPS central power supply
  • the position detector system comprising may comprise wherein the said central power supply (CPS) is incorporated in a pointer holder (18).
  • CPS central power supply
  • Position detector system comprising according to any of the claims 27 to 37 wherein the said central power supply (CPS) is incorporated in mobile casing adapted for containing the said pointers (PDl, PD2, PD3,..) and/or the said holder (18) least one cordless detector units (CDUl, CDU2, CDU3, ..) and/or the said pointer holder (18).
  • CPS central power supply
  • Position detector system comprising according to any of the claims 27 to 38 wherein at least one of the said cordless detector units (CDUl, CDU2, CDU3, ..) at least one of the said pointers (PDl, PD2, PD3,..) comprises means for measuring the power of the said respective rechargeable energy storage means (ESM).
  • ESM rechargeable energy storage means
  • Position detector system comprising according to any of the claims 27 to 39 wherein the means for measuring the power of the said respective rechargeable energy storage means (ESM) are associated to means for cordless transmitting of power indicative signals (PIS) to a power management system, said power indicative signals (PIS) indicating the power of the said respective rechargeable energy storage means (ESM).
  • PIS power indicative signals
  • Position detector system comprising according to any of the claims 27 to 40 wherein the said power management system is established by means of at least one data processing unit (C) associated to the system.
  • C data processing unit
  • Position detector system comprising according to any of the claims 27 to 41 wherein the said central power supply may be connected to the mains () permanently or in periods.
  • Position detector system comprising according to any of the claims 27 to 42 wherin the said central power supply comprises a rechargeable battery or a rechargeable power source.
  • Fig. 21 to 21 c illsutrates a method of measuring the position of at least one marker
  • MA in a detection area (DA), said detection area comprising at least two sub areas (SUBA)
  • each of at least two of said sub areas being associated to a corresponding detector system (DS1, DS2, DS3),
  • the at least one marker (MA) is outside the at least one selected sub-area(SSUBA) measuring the position of the at least one marker (MA) relative to at least one further selected sub-area (FSSUBA) of the sub-areas (SUBA) by means of the said corresponding detector system (DS1, DS2, DS3)
  • each of at least two of said sub areas being associated to a corresponding detector system (DS1, DS2, DS3), *
  • the corresponding detector systems (DS1, DS2, DS3) measures the position of a marker (MA) on the basis of electromagnetic light reflected from the said at least one marker (MA), said light being established by light transmitting means () ers comprised in the said corresponding detector systems (DS1, DS2, DS3)

Abstract

L'invention concerne un système de détection de positions destiné à une zone de détection, de préférence un tableau blanc (10), le dit système comportant un dispositif de détection d'au moins une position (11, 12) d'au moins un marqueur (13) fonctionnant dans la dite zone de détection. Le système comporte en outre un dispositif permettant de stocker une séquence desdites positions détectées dans au moins une mémoire qui comprend des interfaces (181) destinées à exporter les positions stockées ou au moins certaines des positions. Conformément à l'invention, la séquence stockée peut être affichée sur un écran refléchissant l'image dessinée sur le tableau. Les données stockées peuvent être affichées séquentiellement, c'est-à-dire illustrant l'« historique des fichiers », l'image affichée étant formée dans le même ordre que les composants de l'image sur le tableau. Dans un mode de réalisation, les données peuvent également être présentées comme des diapositives, chaque diapositive représentant l'instantané d'écran complet d'une image formée sur le tableau.
EP01907386A 2000-02-21 2001-02-21 Dispositif de detection de positions Withdrawn EP1259935A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01907386A EP1259935A2 (fr) 2000-02-21 2001-02-21 Dispositif de detection de positions

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DKPA200000267 2000-02-21
DK200000267 2000-02-21
EP00201551 2000-04-28
EP00201551A EP1128318A3 (fr) 2000-02-21 2000-04-28 Dispositif de détection de position
EP01907386A EP1259935A2 (fr) 2000-02-21 2001-02-21 Dispositif de detection de positions
PCT/DK2001/000120 WO2001063550A2 (fr) 2000-02-21 2001-02-21 Dispositif de detection de positions

Publications (1)

Publication Number Publication Date
EP1259935A2 true EP1259935A2 (fr) 2002-11-27

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Family Applications (3)

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EP00201551A Withdrawn EP1128318A3 (fr) 2000-02-21 2000-04-28 Dispositif de détection de position
EP01907386A Withdrawn EP1259935A2 (fr) 2000-02-21 2001-02-21 Dispositif de detection de positions
EP01905638A Withdrawn EP1259934A1 (fr) 2000-02-21 2001-02-21 Marqueur

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EP00201551A Withdrawn EP1128318A3 (fr) 2000-02-21 2000-04-28 Dispositif de détection de position

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Application Number Title Priority Date Filing Date
EP01905638A Withdrawn EP1259934A1 (fr) 2000-02-21 2001-02-21 Marqueur

Country Status (3)

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EP (3) EP1128318A3 (fr)
AU (2) AU2001233626A1 (fr)
WO (2) WO2001063550A2 (fr)

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Also Published As

Publication number Publication date
AU2001235355A1 (en) 2001-09-03
WO2001063549A1 (fr) 2001-08-30
WO2001063550A3 (fr) 2002-02-28
AU2001233626A1 (en) 2001-09-03
WO2001063550A2 (fr) 2001-08-30
EP1128318A3 (fr) 2002-01-23
EP1259934A1 (fr) 2002-11-27
EP1128318A2 (fr) 2001-08-29

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