JP5163108B2 - Writing medium and writable writing system - Google Patents

Writing medium and writable writing system Download PDF

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JP5163108B2
JP5163108B2 JP2007334837A JP2007334837A JP5163108B2 JP 5163108 B2 JP5163108 B2 JP 5163108B2 JP 2007334837 A JP2007334837 A JP 2007334837A JP 2007334837 A JP2007334837 A JP 2007334837A JP 5163108 B2 JP5163108 B2 JP 5163108B2
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light
writing
light emitting
wavelength
writing medium
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JP2009157633A (en
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浦 大 輔 松
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大日本印刷株式会社
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  The present invention relates to a writing medium and a writing type writing system used in a writing type writing apparatus.

  In recent years, pen-type writing devices have been developed that can instantaneously read handwritten characters and pictures, convert them into electronic data, and display them on the display of an information processing device.

  Some of such writing type writing apparatuses are used together with a dedicated sheet on which a dot pattern is formed. Specifically, infrared rays are irradiated onto the sheet from a light emitting diode built in the writing type writing device, and light reflected by a portion other than the dot pattern or the dot pattern is built in the writing type writing device. It is read by a CMOS (Complementary Metal Oxide Semiconductor) camera, image-processed and converted into electronic data, and the electronic data is transmitted to an information processing apparatus, whereby handwritten characters and pictures are displayed on a display.

  Here, when a transparent sheet is mounted on the image surface of the display, an infrared absorbing material is used for the dot pattern, and when infrared light reflected by a portion other than the dot pattern is read by a CMOS camera, On the other hand, if the writing type writing apparatus is used while being tilted, it may not be read accurately due to the problem of reflection angle.

  In addition, when a reflective material is used for a portion other than the dot pattern and infrared light reflected by the portion other than the dot pattern is read with a CMOS camera, it is difficult to find a material suitable as the reflective material.

  Therefore, it is considered to use a fluorescent material that emits isotropically as a dot pattern. The use of a fluorescent material for the dot pattern is described in Patent Document 1 and Patent Document 2.

  On the other hand, when such a sheet is pasted on the image surface of the display of the information processing apparatus, the sheet is required to have high transparency so as not to obstruct the image on the display. Here, in order to improve the transparency of the sheet, it is necessary not only to increase the transparency of the sheet material itself, but also to reduce the concentration of the fluorescent material contained in the dot pattern as much as possible.

  However, when the concentration of the fluorescent material currently used is lowered, it becomes difficult to read the light emission of the fluorescent material by the CMOS camera. Therefore, in order to increase the transparency of the sheet, a fluorescent material capable of improving the reading performance is required.

JP 2003-256137 A Japanese Patent No. 3905668

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a writing medium capable of improving transparency by improving reading performance and a writing system provided with the writing medium.

  According to one aspect of the present invention, a transparent writing medium having a coordinate recognition pattern containing a light emitting material is irradiated with light to cause the light emitting material to emit light, and light from the light emitting material is emitted. A writing medium used in a writing type writing apparatus including a reading unit, wherein the light emitting material has a light emission peak having a maximum light emission intensity within a sensitivity wavelength region of the reading unit. A writing medium is provided.

  According to another aspect of the present invention, the writing medium according to one aspect of the present invention, a light irradiation unit that irradiates the writing medium with light and causes the light emitting material to emit light, and light from the light emitting material. A writing-type writing system comprising: a writing-type writing device that includes a reading unit that reads data.

  According to the writing medium of one aspect of the present invention, since the light emitting material has a light emission peak in which the light emission intensity becomes maximum within the sensitivity wavelength range of the reading unit, the reading unit reliably reads the light emission of the light emitting material. And reading performance can be improved. Thereby, the density | concentration of the luminescent material in a coordinate recognition pattern can be reduced, and the transparency of a writing medium can be improved. Moreover, according to the writing type writing system of another aspect of the present invention, it is possible to provide a writing type writing system having a writing medium with improved transparency.

  Embodiments of the present invention will be described below. In the present embodiment, characters or pictures handwritten by a writing type writing device are read on a transparent sheet, coordinate data is calculated by image processing, and characters, pictures, etc. are displayed on the display based on the coordinate data. An aspect is demonstrated.

  FIG. 1 is a schematic configuration diagram of a writing type writing system according to the present embodiment, FIG. 2 is a block diagram of the writing type writing system according to the present embodiment, and FIG. 3 is related to the present embodiment. FIG. 4 is an internal configuration diagram of the writing type writing apparatus shown by cutting out a part of the writing type writing apparatus, and FIG. 4 is a schematic view of the vicinity of the light emitting diode and the CMOS camera of the writing type writing apparatus according to the present embodiment. FIG. 5 is a vertical sectional view of the transparent sheet according to the present embodiment, FIG. 6 is a plan view of the transparent sheet according to the present embodiment, and FIG. 7 is an emission spectrum of the fluorescent material according to the present embodiment. is there.

  As shown in FIGS. 1 and 2, a transparent sheet 2 as a writing medium of the writing type writing system 1 is mounted on the video surface of the display 102 of the information processing apparatus 100. In the present embodiment, the transparent sheet 2 is attached by being attached to the image surface of the display 102, but it may be attached using an instrument or the like.

  The information processing apparatus 100 includes a CPU (not shown), an apparatus main body 101 that includes an interface 101a for receiving coordinate data described later, a display 102 that functions as a display unit, and the like. In this embodiment, the information processing apparatus 100 is described. However, if the information processing function is provided, the present invention can be applied to various mobile terminals such as a mobile phone and a PDA.

  The writing type writing system 1 mainly includes a transparent sheet 2 and a writing type writing apparatus 3.

  First, the writing type writing apparatus 3 will be described. The writing type writing apparatus 3 converts the locus of movement of the writing type writing apparatus 3 on the transparent sheet 2 into electronic data. As shown in FIGS. 3 and 4, the writing type writing apparatus 3 mainly includes a housing 31, a light emitting diode 32 that functions as a light irradiation unit, a CMOS camera 33 that functions as a reading unit, an image processing unit 34, and a storage unit. As a memory 35, an interface 36 functioning as a transmission unit, a writing pressure sensor 37 functioning as a detection unit, a battery 38, a filter 39, and the like.

  The housing 31 has a pen shape and includes a pen tip 31a. The pen tip 31a does not include ink, graphite, or the like.

  The light emitting diode 32 emits light by irradiating the transparent sheet 2 with light to excite a fluorescent material to be described later. The light emitting diode 32 is disposed in the vicinity of the pen tip 31 a in the housing 31.

  The light emitting diode 32 is configured to emit light having a wavelength of 950 nm or less, depending on the type of fluorescent material to be excited. Specifically, it is configured to emit light in an infrared region having a wavelength of 700 nm to 900 nm, preferably a wavelength of 750 nm to 850 nm. In the present embodiment, the light emitting diode 32 is used as the light irradiation unit. However, the light emitting diode 32 is not limited to the light emitting diode 32, and another light source may be used.

  The CMOS camera 33 reads the light emitted from the fluorescent material. Specifically, the CMOS camera 33 is disposed in the vicinity of the pen tip 31a in the housing 31, and as the pen tip 31a moves, the vicinity of the pen tip 31a is successively captured (for example, several tens of times per second). 100 consecutive images). Here, since the fluorescent material included in the dot pattern 22 in the vicinity where the pen tip 31 a passes is emitted by light irradiation from the light emitting diode 32, the light emission of the fluorescent material can be read by the CMOS camera 33. In the present embodiment, the CMOS camera 33 is used as the reading unit. However, the reading unit is not limited to the CMOS camera 33. For example, a CCD (Charge Coupled Device) camera may be used.

  The CMOS camera 33 has a sensitivity wavelength range in which light can be read. In the case of the CMOS camera 33, the sensitivity wavelength region is a wavelength of 950 nm or less. That is, light having a wavelength of 950 nm or less can be read by the CMOS camera 33, but light exceeding the wavelength of 950 nm cannot be almost read by the CMOS camera 33. When a filter 39 (described later) that blocks light having a wavelength of 850 nm or less is arranged on the front surface of the CMOS sensor, the sensitivity wavelength region exceeds the wavelength of 850 nm and becomes a wavelength of 950 nm or less.

  The image processing unit 34 performs image processing on the image data read by the CMO camera 33 and calculates the coordinates of the dot pattern 22 that has passed through the vicinity of the pen tip 31a. Specifically, in the image data read by the CMOS camera 33, since the dot pattern 22 that has passed through the vicinity of the pen tip 31a can be brightened and darkened by the light emission of the fluorescent material and the other parts are dark, this light and darkness is analyzed. By doing so, it is possible to calculate the coordinates of the dot pattern 22 through which the vicinity of the pen tip 31a has passed. The image processing unit 34 includes a CPU and the like.

  The memory 35 is for temporarily storing the coordinate data calculated by the image processing unit 34. The memory 35 stores coordinate data while the user is writing to the transparent sheet 2.

  The interface 36 is for transmitting the coordinate data stored in the memory 35 to the information processing apparatus 100 that is electrically connected to the display 102. The interface 36 is composed of, for example, a wireless transceiver using Bluetooth technology or the like.

  The writing pressure sensor 37 is for detecting the pressure applied to the pen tip 31a when the user writes characters or the like on the transparent sheet 2 by the writing type writing apparatus 3, that is, the writing pressure. The light emitting diode 32 and the CMOS camera 33 are turned on / off by the writing pressure detected by the writing pressure sensor 37. The battery 38 is for supplying power to each element of the writing type writing apparatus 3.

  The filter 39 is for transmitting light from the fluorescent material and blocking light (including reflected light) from the light emitting diode 32, and is disposed on the front surface of the CMOS camera 33. Specifically, for example, the light emitted from the light emitting diode 32 has a wavelength of 750 nm or more and 850 nm or less, and the emission peak at which the emission intensity in the light emitted from the fluorescent material is maximum exceeds the wavelength of 850 nm to 950 nm or less. When present, the filter 39 preferably blocks light having a wavelength of 850 nm or less.

  Next, the transparent sheet 2 will be described. As shown in FIG. 5 and FIG. 6, the transparent sheet 2 is mainly composed of a transparent substrate 21 that can transmit light in the visible region, a transparent dot pattern 22 that functions as a coordinate recognition pattern for indicating absolute coordinates, And a top layer 23 for protecting the dot pattern 22 and the like.

  Here, “transparent” in the present invention means that the image on the display 102 can be seen through the transparent sheet 2 when the transparent sheet 2 is mounted on the image surface of the display 102.

  In this embodiment, the dot pattern 22 is used as the coordinate recognition pattern. However, the dot pattern 22 is not limited as long as the coordinate can be recognized.

  The dot pattern 22 is composed of dots, and the dot interval is about 0.3 mm. The dot pattern 22 is formed by printing using an ink containing a fluorescent material that functions as a light emitting material. Note that although a fluorescent material is used as a light-emitting material in this embodiment mode, the material is not limited to a fluorescent material as long as the material can emit light.

  The fluorescent material receives light from the light emitting diode 32 and is excited to emit light. The fluorescent material has a light emission peak that maximizes the light emission intensity within the sensitivity wavelength range of the CMOS camera 33. Specifically, since the sensitivity wavelength range of the CMOS camera 33 is 950 nm or less, it is necessary for the fluorescent material to have a light emission peak having a maximum light emission intensity at a wavelength of 950 nm or less. Here, when the light emitting diode 32 emits light having a wavelength of 950 nm or less, the light emission peak of the fluorescent material is preferably present in a wavelength region that is equal to or greater than the wavelength of the light emitted from the light emitting diode 32. More specifically, for example, when the light emitting diode 32 emits light having a wavelength of 700 nm or more and 900 nm or less, the emission peak of the fluorescent material is preferably present in a wavelength region of wavelength of 800 nm or more and 950 nm or less. When emitting light having a wavelength of 750 nm or more and 850 nm or less, the emission peak of the fluorescent material is preferably present in a wavelength region of a wavelength of 850 nm or more and 950 nm or less.

  Since the sensitivity wavelength range of the CMOS camera 33 according to the present embodiment is 950 nm or less, the fluorescent material needs to have a light emission peak with the maximum light emission intensity in the wavelength range of 950 nm or less. Since the sensitivity wavelength range varies depending on the type, it goes without saying that the fluorescent material can be appropriately changed in accordance with the sensitivity wavelength range.

As the fluorescent material, for example, a material containing Nd (neodymium) can be used. Examples of the fluorescent material containing Nd include Na 5 Nd (MoO 4 ) 4 , Na 5 (0.15Nd, 0.85Y) (MoO 4 ) 4 , and mixtures thereof.

As shown in FIG. 7, Na 5 Nd (MoO 4 ) 4 and Na 5 (0.15Nd, 0.85Y) (MoO 4 ) 4 both have an emission peak with a maximum emission intensity at a wavelength of about 880 nm. . Note that Na 5 (Nd, Yb) (MoO 4 ) 4 , which is a general infrared phosphor, has a light emission peak at which the light emission intensity is maximum at a wavelength of about 985 nm, and thus is outside the sensitivity wavelength range of the CMOS sensor 33.

Further, Na 5 Nd (MoO 4 ) 4 and Na 5 (0.15Nd, 0.85Y) (MoO 4 ) 4 both have an optimum excitation wavelength of about 827 nm. Therefore, when Na 5 Nd (MoO 4 ) 4 or Na 5 (0.15Nd, 0.85Y) (MoO 4 ) 4 is used as the fluorescent material, the light emitting diode 32 emits light having a wavelength of about 827 nm. Is preferred.

  The top layer 23 is formed so as to cover the dot pattern 22 on the base material 21 and is configured to be able to transmit light in the visible region and the infrared region.

  Next, a method for displaying handwritten characters, symbols, figures and the like on the display 102 using the writing type writing system 1 will be described. FIG. 8 is a flowchart showing an operation state of the writing type writing system 1 according to the present embodiment.

  First, when the pen tip 31a of the writing type writing apparatus 3 is brought into contact with the transparent sheet 2 mounted on the image surface of the display 102, the pen pressure sensor 37 is applied to the pen tip 31a as shown in FIG. Is detected (step 1). As a result, light is emitted from the light emitting diode 32 and the CMOS camera 33 is activated.

  Next, when the pen tip 31 a of the writing type writing apparatus 3 is moved while being in contact with the transparent sheet 2, the light from the light emitting diode 32 is irradiated to the dot pattern 22 one after another, and the light is included in the dot pattern 22 by the light. Excited fluorescent material emits light. Then, the CMOS camera 33 reads the light emitted from the fluorescent material (step 2).

  The light read by the CMOS camera 33 is subjected to image processing by the image processing unit 34, and the coordinates of the dot pattern 22 that has passed near the pen tip 31a are calculated (step 3). Thereafter, the calculated coordinate data is temporarily stored in the memory 35 and transmitted to the interface 101a of the information processing apparatus 100 via the interface 36 (step 4).

  Coordinate data received by the interface 101 a of the information processing apparatus 100 is subjected to arithmetic processing by a CPU (not shown) of the apparatus main body 101 and displayed on the display 102. Thus, handwritten characters, symbols, figures, and the like can be displayed on the display 102 of the information processing apparatus 100 using the writing type writing system 1.

  In the present embodiment, the fluorescent material constituting the dot pattern 22 has a light emission peak with a maximum light emission intensity within the sensitivity wavelength region of the CMOS camera 33. That is, the wavelength of light emitted from the fluorescent material matches the sensitivity wavelength range of the CMOS camera 33. Thereby, since the light emission of a fluorescent material can be reliably read with the CMOS camera 33, reading performance can be improved. As a result, since the concentration of the fluorescent material contained in the dot pattern 22 can be reduced, the transparency of the transparent sheet 2 can be improved.

In this embodiment, when Na 5 Nd (MoO 4 ) 4 , Na 5 (0.15Nd, 0.85Y) (MoO 4 ) 4 and a mixture thereof are used as the fluorescent material, the CMOS camera 33 Since the emission intensity in the sensitivity wavelength range is higher than that of Na 5 (Nd, Yb) (MoO 4 ) 4 which is a general infrared phosphor, the reading performance can be further improved.

  In the present embodiment, since the filter 39 is disposed on the front surface of the CMOS camera 33, external light noise including the light emitting diode 32 can be removed, and the contrast between the dot pattern 22 and portions other than the dot pattern is improved. Can be made. As a result, the CMOS camera 33 can more reliably read the light emitted from the fluorescent material, so that the reading performance can be further improved.

  The present invention is not limited to the description of the above embodiment, and the structure, material, arrangement of each member, and the like can be appropriately changed without departing from the gist of the present invention.

(Example)
Examples will be described below. In this example, a transparent sheet having a dot pattern containing Na 5 Nd (MoO 4 ) 4 is prepared, and whether or not the dot pattern can be read by the writing type writing apparatus described in the above embodiment with a CMOS camera. I experimented. First, a method for producing a transparent sheet used in this example will be described.

(1) Synthesis of fluorescent material 10 g of neodymium oxide (Nd 2 O 3 ), 40 g of sodium carbonate (Na 2 CO 3 ) and 140 g of molybdenum oxide (MoO 3 ) are mixed in a mortar, placed in a platinum crucible, and in the air Baked at 600 ° C. As a result, Na 5 Nd (MoO 4 ) 4 was produced as the fluorescent material.

(2) Preparation of fluorescent ink In a mixed solvent of toluene: methyl ethyl ketone = 1: 1, the concentration of the fluorescent material (Na 5 Nd (MoO 4 ) 4 ) was 12.5% by weight, acrylic resin (Mitsubishi Rayon Co., Ltd.) A fluorescent ink was prepared by mixing 12.5% by weight of BR-101).

(3) Dot pattern printing On the transparent PET film (A4300 manufactured by Toyobo Co., Ltd., thickness 100 μm, easy adhesion on both sides) as a base material, the above-mentioned fluorescent ink is printed with the gravure printing method. A transparent sheet was prepared. At this time, the size of the dot was about 110 μm in diameter of the disk.

  Next, the experimental method and experimental results are described. When the transparent sheet having the dot pattern thus created is irradiated with light in the infrared region of wavelength 830 nm, and the fluorescence is read as an image by the CMOS camera of the writing type writing apparatus, the dot pattern is detected. We were able to.

(Comparative example)
Hereinafter, a comparative example will be described. In the comparative example, a transparent sheet having a dot pattern containing Na 5 (Nd, Yb) (MoO 4 ) 4 is prepared, and the dot pattern is formed with the CMOS camera of the writing type writing apparatus described in the above embodiment. An experiment was carried out to see if it could be read.

First, a method for producing a transparent sheet used in this example will be described. Fluorescent ink is prepared in the same process as in the above example using Na 5 (Nd, Yb) (MoO 4 ) 4 (IRS-F manufactured by Nemoto Special Chemical Co., Ltd.), which is an infrared phosphor, as a fluorescent material. Then, a dot pattern was printed to produce a transparent sheet.

  Next, the experimental method and experimental results are described. The transparent sheet having the dot pattern thus produced was irradiated with light in the infrared region at a wavelength of 830 nm, and fluorescence was read as an image with a CMOS camera of a writing type writing apparatus. The fluorescence of the dot pattern was weaker than that of the transparent sheet, and it was difficult to detect the dot pattern of the comparative example. From this result, it was found that the fluorescent material in the above example was more suitable for the above writing type writing apparatus than the fluorescent material in the comparative example.

FIG. 1 is a schematic configuration diagram of a writing type writing system according to an embodiment. FIG. 2 is a block diagram of the writing type writing system according to the embodiment. FIG. 3 is an internal configuration diagram of the writing type writing apparatus shown by cutting out a part of the writing type writing apparatus according to the embodiment. FIG. 4 is a schematic view of the vicinity of the light emitting diode and the CMOS camera of the writing type writing apparatus according to the embodiment. FIG. 5 is a vertical sectional view of the transparent sheet according to the embodiment. FIG. 6 is a plan view of the transparent sheet according to the embodiment. FIG. 7 is an emission spectrum of the fluorescent material according to the embodiment. FIG. 8 is a flowchart showing an operation state of the writing type writing system according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Writing type writing system, 2 ... Transparent sheet, 3 ... Writing type writing apparatus, 21 ... Base material, 22 ... Dot pattern, 31a ... Pen tip, 32 ... Light emitting diode, 33 ... CMOS camera, 34 ... Image processing Part 39 ... filter 100 ... information processing apparatus 102 ... display.

Claims (9)

  1. A writing-type writing device comprising: a light irradiating unit for irradiating light onto a transparent writing medium having a coordinate recognition pattern containing a luminescent material to emit the luminescent material; and a reading unit for reading light from the luminescent material. A writing medium used in the apparatus,
    The sensitivity wavelength region of the reading unit is a wavelength of 950 nm or less,
    The light emitting material has a light emission peak having a maximum light emission intensity within a sensitivity wavelength region of the reading unit,
    The writing medium, wherein the light emitting material contains at least one of Na 5 Nd (MoO 4 ) 4 and Na 5 (0.15Nd, 0.85Y) (MoO 4 ) 4 .
  2.   The writing medium according to claim 1, wherein the emission peak of the luminescent material exists in an infrared region.
  3.   The writing medium according to claim 1, wherein the reading unit is a CMOS camera.
  4. The light irradiation unit irradiates the 850nm light below wavelength equal to or more than 750 nm, and wherein the emission peak of the light emitting material is present in a wavelength range of 950nm or less than a wavelength 850nm, to any one of claims 1 to 3 The written medium described.
  5. It is disposed in front of the reader, to transmit light from the light emitting material, and further comprising a filter for blocking light from the light irradiation unit, the according to any one of claims 1 to 4 Written medium.
  6. The writing medium according to claim 5 , wherein the filter blocks light having a wavelength of 850 nm or less.
  7. The writing medium according to any one of claims 1 to 6 , wherein the writing medium is a transparent sheet.
  8. Wherein the writing medium is mounted on a display or image plane of the portable terminal display having an information processing function of the information processing apparatus, the writing medium according to any one of claims 1 to 7.
  9. A writing medium according to any one of claims 1 to 8 ,
    A writing type writing apparatus comprising: a light irradiating unit configured to irradiate the writing medium with light to emit the light emitting material; and a reading unit configured to read light from the light emitting material. Built-in writing system.
JP2007334837A 2007-12-26 2007-12-26 Writing medium and writable writing system Expired - Fee Related JP5163108B2 (en)

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KR101109610B1 (en) * 2011-04-25 2012-01-31 주식회사 네오랩컨버전스 A film recorded with code, reader used therefor, electronic device equipped with display covered with the film
JP2015501481A (en) * 2012-04-03 2015-01-15 インテレクチュアル ディスカバリー カンパニー リミテッド Electronic device comprising a film on which a code is recorded, a reader for reading the film on which the code is recorded, and a display device on which the film on which the code is recorded is attached
WO2014038118A1 (en) * 2012-09-07 2014-03-13 パナソニック株式会社 Display device and display control system

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JP2003256122A (en) * 2002-02-28 2003-09-10 Kokuyo Co Ltd Write object, handwriting input equipment, form, white board, display and transparent sheet
JP2007226439A (en) * 2006-02-22 2007-09-06 Sharp Corp Display device and electronic apparatus

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