WO2013136380A1 - Digitizer apparatus - Google Patents

Digitizer apparatus Download PDF

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Publication number
WO2013136380A1
WO2013136380A1 PCT/JP2012/005260 JP2012005260W WO2013136380A1 WO 2013136380 A1 WO2013136380 A1 WO 2013136380A1 JP 2012005260 W JP2012005260 W JP 2012005260W WO 2013136380 A1 WO2013136380 A1 WO 2013136380A1
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WO
WIPO (PCT)
Prior art keywords
light
light emitting
coordinate
emitting units
irradiation
Prior art date
Application number
PCT/JP2012/005260
Other languages
French (fr)
Inventor
Hiroyuki Miyao
Toshio Hosogai
Original Assignee
Hitachi Solutions, Ltd.
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 Hitachi Solutions, Ltd. filed Critical Hitachi Solutions, Ltd.
Publication of WO2013136380A1 publication Critical patent/WO2013136380A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • 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
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G06F3/0423—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen using sweeping light beams, e.g. using rotating or vibrating mirror

Definitions

  • the present invention relates to a digitizer apparatus (coordinate detection apparatus) that uses image sensors to detect a coordinate position of a coordinate designation object, such as an electronic pen and a finger, inserted (touched or approached) to a coordinate input surface, such as a white board.
  • a digitizer apparatus coordinate detection apparatus
  • an interactive white board (abbreviated as "IWB") is widely used.
  • the IWB is realized using a PDP, an LCD, a projector, or the like used as a general display apparatus.
  • Coordinate input means such as a finger and an electronic pen, and a digitizer apparatus are used for input on a display screen, just like input on a black board by a chalk.
  • An arithmetic unit such as a personal computer (PC), processes coordinates of a position input by the coordinate input means, and a processing result is projected on the display apparatus.
  • PC personal computer
  • the digitizer apparatus using image processing by image sensors is widely available in recent years, and the number of digitizer apparatuses is increasing year after year due to advantages including excellent drawing responsiveness and strong resistance to external noise, such as infrared ray, sunlight, and temperature change.
  • the following is representative patent literature using the image sensors.
  • the digitizer apparatus using the image sensors includes: image sensors (a left image sensor and a right image sensor) attached to both end sections (left and right both end sections) in a longitudinal direction of a support member forming a digitizer unit; and a plurality of light emitting units that direct light to a coordinate input surface positioned in lines of sight of the image sensors. Detection is performed based on a coordinate designation object inserted to the coordinate input surface.
  • Fig. 3 is a system configuration diagram showing a schematic configuration of a conventional digitizer apparatus.
  • the digitizer apparatus includes: a control unit 10 that forms a digitizer unit DU; light emitting units 11L and 11R and image sensors 12L and 12R attached to both end sections in a longitudinal direction of the control unit 10; an electronic pen 13 as a coordinate designation material; and an infrared ray receiving unit 14 that receives an infrared ray emitted from the electronic pen 13 when the electronic pen 13 touches a coordinate input surface 18 and that inputs a pen-down signal to the control unit 10.
  • the control unit 10 detects an inserted coordinate position of the electronic pen 13 on the coordinate input surface based on a light shielding image, in which irradiation lights from the light emitting units 11L and 11R are shielded, and transmits the inserted coordinate position to a personal computer (PC) 20.
  • the PC 20 generates a predetermined drawing image at the detected coordinate position and causes a projector 30 to display the drawing image on a wall or white board 1. In this way, the white board 1 displays the drawing image according to a trajectory of the coordinates detected by the control unit 10.
  • Irradiation light emitted from a plurality of light emitting elements 110 forming the left and right light emitting units 11L and 11R are designed to scan the entire coordinate input surface at a scan angle theta so that the detection is possible regardless of the position of insertion of the electronic pen 13 on the coordinate input surface 18.
  • a retroreflection member (retroreflection tape) 15 for retroreflection of irradiation light 16 is attached around the coordinate input surface 18.
  • the image sensors 12L and 12R receive the irradiation light reflected by the retroreflection member 15 attached around the coordinate input surface 18. However, if the electronic pen 13 touches the coordinate input surface 18, the electronic pen 13 shields the irradiation light. Therefore, reflected light is not input at irradiation timing of the irradiation light.
  • the control unit 10 calculates and outputs the position of the light shielding image when the irradiation light is shielded, based on a principle of triangulation.
  • a method of calculating the touched position of the electronic pen 13 based on the principle of triangulation is disclosed in PTL 1 described above, and the description is omitted.
  • Fig. 4(a) is a plan view showing a detailed configuration of the digitizer unit DU.
  • Fig. 4(b) is a perspective view of Fig. 4(a).
  • the digitizer unit DU includes the light emitting units 11L and 11R made of the plurality of light emitting elements 110 (for example, LEDs) attached to both left and right ends in the longitudinal direction of a support member 100 of the control unit 10 and is configured to emit the irradiation light 16 in an arrow direction of the coordinate input surface 18.
  • the light emitting units 11L and 11R made of the plurality of light emitting elements 110 (for example, LEDs) attached to both left and right ends in the longitudinal direction of a support member 100 of the control unit 10 and is configured to emit the irradiation light 16 in an arrow direction of the coordinate input surface 18.
  • the image sensors 12L and 12R are attached on upper sides of the light emitting units 11L and 11R as shown in Fig. 4(b).
  • the positional relationship between the light emitting units 11L and 11R of the digitizer unit DU is as shown in Fig. 4, i.e. if the irradiation lights of the light emitting units 11L and 11R are directed on a flat surface at the same height on the coordinate input surface 18, there is a problem that the irradiation light emitted from a rightmost light emitting element 110a of the light emitting unit 11L and the irradiation light emitted from a leftmost light emitting element 110b of the light emitting unit 11R interfere each other, the irradiation light does not reach the designation object 13 or the retroreflection member 15 even if irradiation is performed at an irradiation angle of 170 degrees or greater. The position of the designation object 13 cannot be detected, and a detection range is reduced.
  • An object of the present invention is to provide a digitizer apparatus that can prevent mutual interference of irradiation lights emitted from left and right light emitting units and further increase the detection range from 170 degrees.
  • the present invention provides a digitizer apparatus including: a pair of light emitting units that are installed on both ends in a longitudinal direction of a support member and that scan irradiation light toward a coordinate designation object inserted to a coordinate input surface; a retroreflection member for retroreflection of irradiation light directed from the light emitting units, the retroreflection member surrounding the coordinate input surface; and a pair of light receiving units that receive light of a light shielding image in which reflected light from the retroreflection member and the irradiation light from the coordinate designation object inserted to the coordinate input surface are shielded, the digitizer apparatus detecting an inserted coordinate position of the coordinate designation object on the coordinate input surface, wherein the pair of light emitting units are installed at positions with different axes of irradiation lights from the light emitting units across an optical axis center plane in the pair of light receiving units.
  • the pair of light emitting units are installed at different positions where the axes of irradiation lights from the light emitting units are symmetrical across the optical axis center plane in the pair of receiving units.
  • irradiation heights on the coordinate input surface of the irradiation lights directed from the pair of light emitting units are different. Therefore, interference of irradiation lights does not occur.
  • the detection range of a designation object can be further increased from the conventional digitizer apparatus, and the coordinate input surface can be effectively used.
  • Fig. 1 is a perspective view showing an embodiment of light emitting units and light receiving units of a digitizer apparatus according to the present invention.
  • Fig. 2 is a front view of Fig. 1.
  • Fig. 3 is a general block diagram showing a configuration of a conventional digitizer apparatus in the present invention.
  • Fig. 4 illustrates details showing a configuration of light emitting units and light receiving units of the conventional digitizer apparatus in the present invention.
  • Fig. 1 is a perspective view showing an embodiment of light emitting units and light receiving units of a digitizer apparatus according to the present invention.
  • Fig. 2 is a front view as seen from a direction A of Fig. 1.
  • the light emitting units and the light receiving units of the digitizer apparatus include: a pair of light emitting units 11L and 11R attached on both ends of a support member 100 of the digitizer apparatus; and image sensors 12L and 12R that are light receiving units.
  • the light emitting units 11L and 11R include a plurality of light emitting elements 110 that circularly scan the irradiation light.
  • the light emitting units 11L and 11R are installed so that axes 300L and 300R of irradiation lights from the light emitting units 12L and 12R are at different symmetrical positions across an optical axis center plane 200 in the pair of light receiving units 12L and 12R as shown in Fig. 2.
  • irradiation heights on the coordinate input surface of the irradiation lights directed from the pair of light emitting units 11L and 11R are different. Therefore, interference of irradiation lights does not occur.
  • the detection range of a designation object, such as an electronic pen can be further increased from 170 degrees of the conventional digitizer apparatus, and the coordinate input surface can be effectively used.
  • the distance between the irradiation light axis plane and the light receiving optical axis plane can be selected at positions where the irradiation lights from the light emitting units do not directly enter the light receiving units, and the distance is not limited.
  • DU digitizer unit 10 control unit 11L, 11R light emitting units 12L, 12R image sensors 13 electronic pen 14 infrared ray receiving unit 15 retroreflection member 16 irradiation light 17 retroreflection light 18 coordinate input surface 20 personal computer 30 projector 200 light receiving optical axis center plane 300L, 300R irradiation light axes

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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)

Abstract

Provided is a digitizer apparatus that can prevent mutual interference of irradiation lights emitted from left and right light emitting units and further increase the detection range from 170 degrees. The digitizer apparatus includes: a pair of light emitting units that are installed on both ends in a longitudinal direction of a support member and that scan irradiation light toward a coordinate designation object inserted to a coordinate input surface; a retroreflection member for retroreflection of irradiation light directed from the light emitting units, the retroreflection member surrounding the coordinate input surface; and a pair of light receiving units that receive light of a light shielding image in which reflected light from the retroreflection member member and the irradiation light from the coordinate designation object inserted to the coordinate input surface are shielded, the digitizer apparatus detecting an inserted coordinate position of the coordinate designation object on the coordinate input surface, wherein the pair of light emitting units are installed at positions with different axes of irradiation lights from the light emitting units across an optical axis center plane in the pair of light receiving units.

Description

DIGITIZER APPARATUS
The present invention relates to a digitizer apparatus (coordinate detection apparatus) that uses image sensors to detect a coordinate position of a coordinate designation object, such as an electronic pen and a finger, inserted (touched or approached) to a coordinate input surface, such as a white board.
In recent years, an interactive white board (abbreviated as "IWB") is widely used. The IWB is realized using a PDP, an LCD, a projector, or the like used as a general display apparatus. Coordinate input means, such as a finger and an electronic pen, and a digitizer apparatus are used for input on a display screen, just like input on a black board by a chalk. An arithmetic unit, such as a personal computer (PC), processes coordinates of a position input by the coordinate input means, and a processing result is projected on the display apparatus.
The digitizer apparatus using image processing by image sensors is widely available in recent years, and the number of digitizer apparatuses is increasing year after year due to advantages including excellent drawing responsiveness and strong resistance to external noise, such as infrared ray, sunlight, and temperature change.
The following is representative patent literature using the image sensors.
JP Patent Publication (Kokai) No. 9-91094A (1997) COORDINATE DETECTOR FOR TOUCH PANEL
The digitizer apparatus using the image sensors includes: image sensors (a left image sensor and a right image sensor) attached to both end sections (left and right both end sections) in a longitudinal direction of a support member forming a digitizer unit; and a plurality of light emitting units that direct light to a coordinate input surface positioned in lines of sight of the image sensors. Detection is performed based on a coordinate designation object inserted to the coordinate input surface.
Fig. 3 is a system configuration diagram showing a schematic configuration of a conventional digitizer apparatus. The digitizer apparatus includes: a control unit 10 that forms a digitizer unit DU; light emitting units 11L and 11R and image sensors 12L and 12R attached to both end sections in a longitudinal direction of the control unit 10; an electronic pen 13 as a coordinate designation material; and an infrared ray receiving unit 14 that receives an infrared ray emitted from the electronic pen 13 when the electronic pen 13 touches a coordinate input surface 18 and that inputs a pen-down signal to the control unit 10. At timing of input of the pen-down signal, the control unit 10 detects an inserted coordinate position of the electronic pen 13 on the coordinate input surface based on a light shielding image, in which irradiation lights from the light emitting units 11L and 11R are shielded, and transmits the inserted coordinate position to a personal computer (PC) 20. The PC 20 generates a predetermined drawing image at the detected coordinate position and causes a projector 30 to display the drawing image on a wall or white board 1. In this way, the white board 1 displays the drawing image according to a trajectory of the coordinates detected by the control unit 10.
Irradiation light emitted from a plurality of light emitting elements 110 forming the left and right light emitting units 11L and 11R are designed to scan the entire coordinate input surface at a scan angle theta so that the detection is possible regardless of the position of insertion of the electronic pen 13 on the coordinate input surface 18.
A retroreflection member (retroreflection tape) 15 for retroreflection of irradiation light 16 is attached around the coordinate input surface 18.
The image sensors 12L and 12R receive the irradiation light reflected by the retroreflection member 15 attached around the coordinate input surface 18. However, if the electronic pen 13 touches the coordinate input surface 18, the electronic pen 13 shields the irradiation light. Therefore, reflected light is not input at irradiation timing of the irradiation light. The control unit 10 calculates and outputs the position of the light shielding image when the irradiation light is shielded, based on a principle of triangulation.
A method of calculating the touched position of the electronic pen 13 based on the principle of triangulation is disclosed in PTL 1 described above, and the description is omitted.
Fig. 4(a) is a plan view showing a detailed configuration of the digitizer unit DU. Fig. 4(b) is a perspective view of Fig. 4(a).
As shown in Figs. 4(a) and 4(b), the digitizer unit DU includes the light emitting units 11L and 11R made of the plurality of light emitting elements 110 (for example, LEDs) attached to both left and right ends in the longitudinal direction of a support member 100 of the control unit 10 and is configured to emit the irradiation light 16 in an arrow direction of the coordinate input surface 18.
The image sensors 12L and 12R are attached on upper sides of the light emitting units 11L and 11R as shown in Fig. 4(b).
If the positional relationship between the light emitting units 11L and 11R of the digitizer unit DU is as shown in Fig. 4, i.e. if the irradiation lights of the light emitting units 11L and 11R are directed on a flat surface at the same height on the coordinate input surface 18, there is a problem that the irradiation light emitted from a rightmost light emitting element 110a of the light emitting unit 11L and the irradiation light emitted from a leftmost light emitting element 110b of the light emitting unit 11R interfere each other, the irradiation light does not reach the designation object 13 or the retroreflection member 15 even if irradiation is performed at an irradiation angle of 170 degrees or greater. The position of the designation object 13 cannot be detected, and a detection range is reduced.
An object of the present invention is to provide a digitizer apparatus that can prevent mutual interference of irradiation lights emitted from left and right light emitting units and further increase the detection range from 170 degrees.
To attain the object, the present invention provides a digitizer apparatus including: a pair of light emitting units that are installed on both ends in a longitudinal direction of a support member and that scan irradiation light toward a coordinate designation object inserted to a coordinate input surface; a retroreflection member for retroreflection of irradiation light directed from the light emitting units, the retroreflection member surrounding the coordinate input surface; and a pair of light receiving units that receive light of a light shielding image in which reflected light from the retroreflection member and the irradiation light from the coordinate designation object inserted to the coordinate input surface are shielded, the digitizer apparatus detecting an inserted coordinate position of the coordinate designation object on the coordinate input surface, wherein
the pair of light emitting units are installed at positions with different axes of irradiation lights from the light emitting units across an optical axis center plane in the pair of light receiving units.
According to the present invention, the pair of light emitting units are installed at different positions where the axes of irradiation lights from the light emitting units are symmetrical across the optical axis center plane in the pair of receiving units. As a result, irradiation heights on the coordinate input surface of the irradiation lights directed from the pair of light emitting units are different. Therefore, interference of irradiation lights does not occur. The detection range of a designation object can be further increased from the conventional digitizer apparatus, and the coordinate input surface can be effectively used.
Fig. 1 is a perspective view showing an embodiment of light emitting units and light receiving units of a digitizer apparatus according to the present invention. Fig. 2 is a front view of Fig. 1. Fig. 3 is a general block diagram showing a configuration of a conventional digitizer apparatus in the present invention. Fig. 4 illustrates details showing a configuration of light emitting units and light receiving units of the conventional digitizer apparatus in the present invention.
Hereinafter, an embodiment in carrying out the present invention will be specifically described with reference to the drawings.
Fig. 1 is a perspective view showing an embodiment of light emitting units and light receiving units of a digitizer apparatus according to the present invention. Fig. 2 is a front view as seen from a direction A of Fig. 1.
As shown in Figs. 1 and 2, the light emitting units and the light receiving units of the digitizer apparatus according to the present invention include: a pair of light emitting units 11L and 11R attached on both ends of a support member 100 of the digitizer apparatus; and image sensors 12L and 12R that are light receiving units.
As in the conventional digitizer apparatus, the light emitting units 11L and 11R include a plurality of light emitting elements 110 that circularly scan the irradiation light.
Unlike in the conventional digitizer apparatus, the light emitting units 11L and 11R are installed so that axes 300L and 300R of irradiation lights from the light emitting units 12L and 12R are at different symmetrical positions across an optical axis center plane 200 in the pair of light receiving units 12L and 12R as shown in Fig. 2.
According to the configuration, irradiation heights on the coordinate input surface of the irradiation lights directed from the pair of light emitting units 11L and 11R are different. Therefore, interference of irradiation lights does not occur. The detection range of a designation object, such as an electronic pen, can be further increased from 170 degrees of the conventional digitizer apparatus, and the coordinate input surface can be effectively used.
The distance between the irradiation light axis plane and the light receiving optical axis plane can be selected at positions where the irradiation lights from the light emitting units do not directly enter the light receiving units, and the distance is not limited.
DU digitizer unit
10 control unit
11L, 11R light emitting units
12L, 12R image sensors
13 electronic pen
14 infrared ray receiving unit
15 retroreflection member
16 irradiation light
17 retroreflection light
18 coordinate input surface
20 personal computer
30 projector
200 light receiving optical axis center plane
300L, 300R irradiation light axes

Claims (1)

  1. A digitizer apparatus comprising: a pair of light emitting units that are installed on both ends in a longitudinal direction of a support member and that scan irradiation light toward a coordinate designation object inserted to a coordinate input surface; a retroreflection member for retroreflection of irradiation light directed from the light emitting units, the retroreflection member surrounding the coordinate input surface; and a pair of light receiving units that receive light of a light shielding image in which reflected light from the retroreflection member member and the irradiation light from the coordinate designation object inserted to the coordinate input surface are shielded, the digitizer apparatus detecting an inserted coordinate position of the coordinate designation object on the coordinate input surface, wherein
    the pair of light emitting units are installed at positions with different axes of irradiation lights from the light emitting units across an optical axis center plane in the pair of light receiving units.
PCT/JP2012/005260 2012-03-14 2012-08-22 Digitizer apparatus WO2013136380A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012056819A JP2013191005A (en) 2012-03-14 2012-03-14 Digitizer device
JP2012-056819 2012-03-14

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WO2013136380A1 true WO2013136380A1 (en) 2013-09-19

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WO (1) WO2013136380A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017013957A1 (en) * 2015-07-17 2017-01-26 富士電機株式会社 Optical touch panel, reflection-preventing structure for inner surface of cover, and vending machine
TWI653563B (en) * 2016-05-24 2019-03-11 仁寶電腦工業股份有限公司 Projection touch image selection method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000132339A (en) * 1998-10-23 2000-05-12 Ricoh Co Ltd Coordinate input device
JP2002032195A (en) * 2000-07-19 2002-01-31 Fujitsu General Ltd Optical scanning-type touch panel and method for adjusting optical axis thereof
JP2009199259A (en) * 2008-02-20 2009-09-03 Sharp Corp Touch panel device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000132339A (en) * 1998-10-23 2000-05-12 Ricoh Co Ltd Coordinate input device
JP2002032195A (en) * 2000-07-19 2002-01-31 Fujitsu General Ltd Optical scanning-type touch panel and method for adjusting optical axis thereof
JP2009199259A (en) * 2008-02-20 2009-09-03 Sharp Corp Touch panel device

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