JP3225900U - Grip force measurement writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the restriction on writing instruments and writing media by measuring the gripping force of writing instruments and use it as a quantitative index, and to evaluate natural writing that does not give discomfort to writers, writing instrument parts and writing information. Provide the system. A shaft part (1) having a size capable of writing operation and a grip part (2) for gripping provided on a surface of the shaft part are provided, and the shaft part (1) has an insulating property at least in a contact range with the grip part (2). The grip portion 2 has at least the conductive layer 11, the conductive sponge 12, and the conductive layer 13 that is elastically deformed at the time of gripping in this order from the surface of the shaft portion. By having a function of measuring the maximum force applied to the resistance value of the conductive sponge 12, the writing medium is not limited. [Selection diagram] Figure 1

Description

  The present invention relates to a writing instrument for measuring gripping force. More specifically, the present invention relates to a writing instrument that is attached to or attached to a writing instrument and that is capable of measuring a gripping force during a writing operation and recognizing a handwritten character from the change over time.

  Currently, many writing tools or parts have been developed that measure quantitative indexes such as writing pressure, inclination of the writing tool, and coordinate position of a contact point between the writing tool and the writing object with respect to the writing operation.

  By using such a writing instrument, it is possible to convert handwritten characters into text and digitize handwriting from measured values, and it can also be used for handwriting verification and electronic signature. As an example of measuring a quantitative index from a writing instrument, there is Patent Document 1. The purpose of this writing instrument is to provide a strain gauge at the gripping portion of the writing instrument and measure the grasping pressure from the strain of the writing instrument during writing to apply it to handwriting identification or the like.

Japanese Patent Laid-Open No. 1-248224

Many of the above-mentioned writing instruments or parts for measuring the quantitative index have achieved measurement accuracy by limiting either or both of the writing instrument and the writing object for measurement. For example, the writing medium must be a special paper, the writing range is limited, and the hand must not touch the writing medium. Further, many of them measure the quantitative index only at the contact point between the writing tool and the writing medium, and the writing operation of twisting the axis of the writing tool is not reflected. These give a writer a feeling of strangeness, and there is a problem in that the font is different from the one written on paper.

  In view of the above circumstances, the present invention provides a measurement writing instrument that measures the gripping force of a writing instrument and uses it as a quantitative index to reduce the limitation of writing instruments and writing media, and to evaluate natural writing that does not give a sense of discomfort to the writer. The purpose is to provide.

A writing instrument according to a first aspect of the present invention includes a shaft portion having a size capable of performing a writing operation, and a grip portion provided on a surface of the shaft portion for gripping, and the shaft portion has an insulating property at least in a contact range with the grip portion. However, the grip part has a conductive layer, a conductive sponge, and a conductive layer that elastically deforms during gripping in this order from at least the surface of the shaft, and conducts the maximum force applied to the shaft during gripping and writing. A measuring writing instrument that does not limit the writing medium is provided by having a function of measuring the resistance value of the sex sponge.
A writing instrument according to a second aspect of the invention is characterized in that, in the first aspect of the invention, at least a piezo film insulated from another is provided at a position on the outer surface of the conductive layer that is elastically deformed when grasped.
A writing instrument according to a third aspect of the invention is characterized in that, in the second aspect, the grip portion contact area of the shaft portion has a shape of a regular triangular prism.
The writing instrument according to the fourth aspect of the invention is the writing instrument according to the third aspect of the invention, wherein the conductive layers are arranged one by one on the three side surfaces of the regular triangular prism portion of the first axial portion so that they are not in contact with each other. It is a rectangular type whose length direction and long side length match, and the center line parallel to the long side has a shape arranged on the center line of each triangular prism side surface parallel to the shaft length direction. And
The writing instrument of the fifth invention is the writing instrument according to the third invention, wherein a total of six conductive layers are arranged on the three side surfaces of the equilateral triangular prism portion of the shaft portion such that two conductive layers are not in contact with each other. It has a shape such that one sheet is placed in the range divided on the center line of each triangular prism side surface parallel to the axial direction, and at a position equidistant from the center line of each triangular prism side surface parallel to the axial direction. It is characterized by
A writing instrument according to a sixth aspect of the invention is characterized in that, in the second aspect of the invention, the grip portion contact area of the shaft portion has a true cylindrical shape.
The writing instrument according to a seventh aspect of the invention is the writing instrument according to the sixth aspect, wherein three conductive layers are arranged on the sides of the true cylindrical portion of the shaft portion at positions where they do not contact each other, and the shape is the length direction and the long side of the true cylindrical portion of the shaft portion. Are of a rectangular shape whose lengths match, the long sides of the conductive layer are parallel to the center line of the true cylinder portion, and three pieces are equidistantly located on the sides of the true cylinder portion. And
The writing instrument of the eighth invention is the writing instrument of any one of the first invention to the seventh invention, characterized in that it has a conversion device for converting a signal from the grip portion into electronic information.
A writing instrument according to a ninth aspect is the writing instrument according to any one of the first to eighth aspects, characterized in that a resin layer is provided on the outermost surface of the grip portion.
A writing instrument according to a tenth aspect of the present invention is the writing instrument according to any one of the first to ninth aspects, and is provided with the same number of resistors as the number of conductive layers, thereby having a function of outputting a voltage value fluctuation. Is characterized by.
The writing instrument component according to an eleventh aspect of the present invention is the writing instrument according to any one of the first to tenth aspects, wherein an innermost surface of the grip portion includes a grip shaft having insulation and elasticity, and the grip shaft is the shaft. A hole for inserting the portion, the hole for inserting the shaft portion is provided with a resin layer having frictional properties on the inner surface thereof so that at least the shaft portion does not slip, and does not limit the writing implement and the writing medium. Characterize.
A writing information system according to a twelfth invention comprises a writing instrument type device and a writing medium capable of measuring coordinates of a point at which the writing instrument type device comes into contact. The writing instrument type device according to any one of the first invention to the eleventh invention. A writing instrument of the invention, in which the gripping force measured by the writing instrument type device and the contact point pressure between the writing instrument type device and the writing medium, and the writing instrument type device measured by the writing medium and the writing medium contact each other It is characterized in that it has a function of measuring the coordinates of the selected points and converting them into numerical data.

According to the first aspect, since the electric resistance value of the conductive sponge changes with the maximum force in the direction perpendicular to the shaft portion, it is possible to evaluate the maximum gripping force when gripping the writing instrument. In addition, if the maximum gripping force is measured with time, the single lowercase alphabet can be recognized.
According to the second invention, when the piezo film is provided, the piezo film output voltage rises at each break between characters when writing a character string. Therefore, by measuring the piezo film output voltage at the same time as the gripping force changes, It is possible to distinguish between written characters and recognize consecutive characters.
According to the third aspect, when the grip portion contact area of the shaft portion has the shape of a regular triangular prism, the fingers to be grasped and the grasping positions are unified, so that individual differences in the grasping force can be evaluated.
According to the fourth aspect, when the conductive layer is provided on each side surface of the regular triangular prism, the gripping force of each finger to be gripped is measured, so that the gripping force of each finger can be compared with each other.
According to the fifth invention, when two conductive layers are provided on each of the three side surfaces of the regular triangular prism portion, a total of six conductive layers, the gripping force is measured at two locations for one finger. Also, it becomes possible to measure the twisting motion.
According to the sixth aspect, when the contact portion of the grip portion of the shaft portion has a true cylindrical shape, the gripping form is given an arbitrary shape, and the gripping force for natural writing can be measured.
According to the seventh invention, if the three conductive layers are provided, the grip force distribution for natural writing can be measured, so that the handwriting recognition performance can be improved.
According to the eighth aspect, since the gripping force can be converted into electronic information, it becomes a new quantitative index in computerization of handwriting, and the performance of character recognition and handwriting recognition can be improved.
According to the ninth aspect, when the resin layer is provided on the outermost surface of the grip portion, the conductive sponge and the conductive layer can be protected and the operability in the gripped state can be improved.
According to the tenth aspect, since the change in the resistance value of the conductive sponge corresponding to the change in the gripping force corresponds to the change in the voltage value, the gripping force can be evaluated by the change in the voltage value.
According to the eleventh aspect, when the grip shaft is provided, the grip portion has a shape independent of the shaft portion, so that it can be attached to and detached from any writing instrument.
According to the twelfth invention, it is possible to provide synchronized numerical values of the gripping force, the coordinate value, and the writing pressure as a quantitative index for the writing operation.

It is a schematic explanatory drawing of the holding force measuring writing instrument of this embodiment, (A) is the whole writing instrument which the grip part 2 was comprised in the shaft part 1, (B) is sectional drawing of the grip part 2, C) is a block diagram of a writing force measuring writing instrument. It is a figure showing the gripping force measurement principle, (A) is an explanatory view of the gripping force measurement principle, and (B) is a mimetic diagram of an obtained gripping force waveform. It is a schematic explanatory drawing of the writing instrument which added the piezo film 15 to the component of the holding force measuring writing instrument of FIG. 1, (A) is sectional drawing of the grip part 2 which comprises the piezo film 15, (B) is a piezo. A block diagram including the film 15, (C) is a schematic diagram of the obtained gripping force waveform. FIG. 4A is a schematic explanatory view of a writing instrument in which the shaft portion 1 of the constituent elements of the gripping force measuring writing instrument of FIG. 3 is changed to a regular triangular prism type and the conductive layer 11 is divided into three, and (A) is three regular triangular prism type conductive layers. It is sectional drawing of the grip part 2 of a structure, (B) is a schematic diagram of the obtained gripping force waveform. It is a schematic explanatory drawing of the gripping force measuring writing instrument which added or changed the component of the gripping force measuring writing instrument, (A) divides the conductive layer 11 of the gripping force measuring writing instrument of FIG. 4, and adds the resin layer 16 to it. FIG. 4B is a cross-sectional view of the grip part 2 in which the conductive layer 11 of the gripping force measuring writing instrument of FIG. 3 is divided and a resin layer 16 is added. It is a schematic explanatory drawing of the gripping force measuring writing instrument which added / changed the component of the gripping force measuring writing instrument, (A) adds the resin layer 16 to the gripping force measuring writing instrument of FIG. 3, and grips the shaft part 1. It is sectional drawing of the components of the gripping force measuring writing instrument which changed into the axis | shaft 17, (B) is sectional drawing of the component of the gripping force measuring writing instrument which changed the shaft part 1 of FIG. 5 (B) into the grip shaft 17. This is an embodiment of the amplification and filter circuit 23, which is an amplification circuit using an operational amplifier (BU7421). Gripping Force Measurement It is a waveform of the gripping force for two persons from the single lower case alphabetic letters a to d measured in the example of the parts of the writing instrument. Gripping Force Measurement It is a gripping force waveform for two persons from single lower case alphabets e to h measured in the example of the parts of the writing instrument. Gripping Force Measurement It is a gripping force waveform for two persons from the single lower case alphabetic letters i to 1 measured in the example of the parts of the writing instrument. Gripping Force Measurement It is a gripping force waveform for two persons from a single lower case alphabet m to p measured in an example of a writing instrument part. Gripping Force Measurement It is a gripping force waveform for two persons from a single lower case alphabetic letter q to t measured in an example of a writing instrument part. Gripping force measurement It is a gripping force waveform for two persons from the single lower case alphabets u to x measured in the example of the writing instrument part. Gripping Force Measurement It is a gripping force waveform for two persons from the single lower case alphabets y to z measured in the examples of the parts of the writing instrument. Gripping Force Measurement The gripping force and the output voltage waveform of the piezo film of continuous lower case alphabet measured in the example of the parts of the writing instrument, (A) is the measurement waveform when the continuous lower case alphabet "student" is written, (B) is a diagram in which the waveform of (A) is divided at the spike occurrence points of the output voltage of the piezo film.

The gripping force measuring writing instrument of the present embodiment is a writing instrument that measures the gripping force during a writing operation, and the gripping force is evaluated using a conductive sponge, and the gripping force is used as a quantitative index for handwritten character recognition. The feature is that
Hereinafter, the gripping force measuring writing instrument of the present embodiment will be described with reference to the drawings.

  In FIG. 1 (A), the writing force measuring writing instrument is composed of a shaft portion 1 and a grip portion 2. The shaft portion 1 plays a role of determining a gripping posture of the user and serving as a frame for keeping the shape and electric characteristics of the grip portion 2 constant. Therefore, by making the material of the shaft portion 1 an insulator such as plastic or sandwiching an insulating film between the shaft portion 1 and the grip portion 2, a contact portion between the grip portion 2 and the shaft portion 1 is formed. As long as it has an insulating property, there is no limitation on the size, material, shape, and function of containing ink, etc. within a range in which the writing operation can be performed. As shown in the cross-sectional view of FIG. 1 (B), the grip portion 2 is composed of a conductive layer 11, a conductive sponge 12 and a deformable conductive layer 13 in this order from the outer surface of the shaft portion 1.

The conductive layer 11, the conductive sponge 12, and the conductive layer 13 having a deformability are stacked in this order in a state of being in contact with each other, and thus have a role like a variable resistance whose resistance value changes according to a gripping force. The gripping force can be evaluated with a value.
In the gripping force measuring writing instrument having the above configuration, the resistance value can be measured by the following device, for example. As shown in FIG. 1C, a power source 21, a conductive layer 11, a conductive sponge 12, a conductive layer 13 having a deformability, and a resistor 14 are connected in series, and according to Ohm's law and Kirchhoff's law. It is desirable to evaluate the gripping force by acquiring the voltage value of the resistor 14 based on the measurement device 22. Further, at this time, if the power source 21 and the resistor 14 are configured on the surface or inside of the shaft portion 1 like the grip portion 2 and the data is transmitted to the external measuring device 22 by wireless communication, writing by wiring or the like is possible. The user's discomfort with respect to can be eliminated.

By using the above-mentioned gripping force measuring writing tool at the time of writing, the maximum gripping force when gripping the writing tool can be evaluated. Further, if the maximum gripping force is measured with time, it becomes possible to recognize a single lower case alphabet.
The details of this measurement principle will be described below.

The gripping force measurement utilizes the characteristics of the conductive sponge 12. As the name implies, the conductive sponge 12 is a conductive sponge and has a resistance value of several MΩ to several tens MΩ. This resistance value changes when the sponge is compressed, and the resistance value decreases as the sponge is compressed. Utilizing this characteristic, the present invention has a relationship in which a variable resistor including the conductive layer 11, the conductive sponge 12, and the conductive layer 13 having a deformability is installed at the position of the finger gripping the writing instrument. There is.
For example, when a device as shown in FIG. 1C is configured and a writing operation is performed in an energized state, the finger compresses the conductive sponge 12 as shown in FIG. 2A. At this time, the resistance value is the resistance value from the most compressed point of the conductive sponge 12 to the shaft portion in terms of current characteristics. That is, the resistance value corresponds to the maximum force in the direction perpendicular to the shaft. This maximum force changes from moment to moment depending on the writing pressure of the writer and the letters written, and accordingly, the resistance value of the conductive sponge 12 changes. If the resistance value of the conductive sponge 12 changes, the voltage applied to the resistor 14 connected in series will change according to Kirchhoff's law. That is, the voltage change of the resistor 14 depends on the gripping force during the writing operation.
From the above, the maximum gripping force of the finger can be measured based on the voltage change of the resistor 14.

  The voltage value corresponding to the maximum gripping force obtained by the above principle can be continuously recorded with time by using a general measuring device 22. When this is plotted for each letter of the lower case alphabet, the waveform of the gripping force change as shown in FIG. 2B can be obtained. The waveform of FIG. 2B has different shapes (number of peaks, relative size / positional relationship between peaks, etc.) depending on the written lowercase alphabets. When the same letter is written, the waveform is almost the same. Become. In addition, even if the writer is different, the waveform shapes when the same character is written are almost the same, so by analyzing the characteristics of the waveform pattern for each character by reinforcement learning, etc., character recognition is possible regardless of the writer.

  By adding or changing the configuration of the above-mentioned gripping force measuring writing instrument, it is possible to improve accuracy and use it for various measurements. The additional configuration, contents, and effects will be described below.

  FIG. 3 (A) is a writing tool in which a piezo film 15 is added to the writing force measuring writing tool of FIG. The piezo film 15 is disposed on the outer surface of the conductive layer 13 having at least the deformability. The piezo film 15 generates a voltage in accordance with a slight change in gripping force between one character during the writing operation of continuous characters, and thus plays the role of a break sensor between characters when writing a character string. Since the piezo film 15 generates a voltage, it needs to be in an insulating state from other things so as not to affect the resistance value and the like of the conductive sponge 12. For example, the insulating property can be maintained by winding an insulating film around the piezo film 15 itself. Further, since the piezo film 15 can react even with a minute strain, it is not necessary to completely cover the outer periphery of the conductive layer 13 having deformability, and it is sufficient that the piezo film 15 is partially configured as shown in FIG. .

  Since the output voltage of the piezo film 15 is small and environmental noise is easily added, it is desirable to input it to the measuring device 22 via the amplification and filter circuit 23 operated by the power source 21 as shown in FIG. 3B.

By using the gripping force measuring writing instrument having the above configuration at the time of writing, it becomes possible to distinguish between the written characters and the continuous character content from the obtained gripping force waveform.
The details of this measurement principle will be described below.

The piezo film 15 is a film-shaped piezoelectric element and can generate a voltage according to the magnitude of strain. That is, the piezo film 15 has a voltage generated at the moment of deformation and at the moment of returning to its original shape. When the voltage is maintained in the deformed state, the voltage gradually converges to zero. When the piezo film 15 is provided in the grip portion 2 by utilizing this, no voltage is generated while the writing instrument is held, but a voltage is generated because a person increases the holding force of the writing instrument at the start of writing. A large voltage is not generated when writing is continued, and a voltage is generated again because the force is relaxed when moving to the second stroke or the next character. At this time, the operation of moving to the next character is generally larger than the operation of moving to the second stroke. Therefore, the voltage generated by the piezo film 15 also increases at the breaks in the characters.
From the above, by tracing the voltage generated by the piezo film 15, a waveform as shown in FIG. 3C can be obtained, and it becomes possible to determine the breaks in the characters. Since the waveform of the gripping force by the conductive sponge 12 and the waveform of the character break determination by the piezo film 15 are synchronized, the gripping pressure waveform can be decomposed character by character based on the voltage waveform of the piezo film 15. Then, by analyzing the waveform pattern for each character, the contents of consecutive characters can be recognized.

  In FIG. 4, the contact range between the shaft portion 1 and the grip portion 2 in FIG. 3 is changed to a regular triangular prism type, and the conductive layers 11 are arranged on the three side surfaces of the regular triangular prism portion so that they do not contact each other one by one. It is a force measurement writing instrument. By making the contact area of the grip portion 2 into a regular triangular prism shape, the user generally grips the thumb, forefinger, and middle finger so as to support each surface. Positions can be unified and individual differences in gripping force can be evaluated. Further, the three conductive layers 11 are of a rectangular shape in which the length direction of the triangular prism shape of the shaft portion 1 matches the length of the long side, and the center line parallel to the long side is each triangular prism parallel to the longitudinal direction of the shaft portion. When the conductive layers 11 are arranged so as to be located on the center lines of the side surfaces, the conductive layers 11 are arranged in the center of each surface without contacting each other, as shown in FIG. When the writing operation is performed with this writing instrument, since the conductive sponge 12 is one and the conductive layer is three, the gripping force of each of the thumb, the index finger, and the middle finger can be measured as shown in FIG. 4B. . In this case, the resistors 14 are arranged by the number of the conductive layers 11 and the closed loops are formed by the resistors 14, so that the gripping force of each finger can be measured.

By using the gripping force measuring writing instrument having the above configuration at the time of writing, as shown in FIG. 4 (B), the gripping force varies depending on the finger even at the same time, that is, by comparing the gripping force by each finger, the gripping and writing can be performed. Therefore, it becomes possible to evaluate which finger is mainly working at that time. In addition, since the obtained quantitative index increases, it becomes easier to capture the waveform characteristics of the writing of a specific character, and it is possible to improve the character recognition accuracy. In addition, since the gripping postures have been standardized, it is possible to compare between users, and the obtained quantitative index can be used for character evaluation and personal identification based on the strength of gripping force and the writing speed. there is a possibility.

The shape of the shaft portion 1 and the structure of the grip portion 2 may be the following structures (FIGS. 5 and 6).
FIG. 5 (A) is a writing instrument in which the number of conductive layers 11 on each side of FIG. 4 is changed from three to two on each of the three side surfaces to a total of six at positions not contacting each other, and two conductive layers 11 on each side are , One each in the range divided on the center line of each triangular prism side surface parallel to the lengthwise direction of the shaft part 1, equidistant from the centerline of each triangular prism side surface parallel to the lengthwise direction of the shaft part 1 There is. Since the number of conductive layers is 6, the gripping force can be measured at two locations for one finger. Therefore, by associating the positional relationship of the conductive layer 11 with the gripping force, the gripping force distribution and the twisting motion can be measured. Is possible. By measuring the grip force distribution and the twisting motion, it is possible to record not only the handwriting and character recognition but also the shape and posture of the written character itself such as stopping, splashing, and flapping. At this time, by shortening the length of the conductive layers 11 in the width direction, it is possible to increase the distance between the conductive layers 11 while keeping the conductive layers 11 at equal intervals within the triangular prism range, and improve the accuracy of gripping force distribution evaluation. You can Although it is possible to arrange six or more conductive layers 11 based on the above concept, it is preferable that the total number of conductive layers 11 is about six, that is, two sheets on each side of the triangular prism in view of the size and use of the writing instrument.

In FIG. 5B, the contact area of the grip portion 2 of the shaft portion 1 of FIG. 3 is changed to a true cylindrical shape, and three conductive layers 11 are provided on the side surfaces of the true cylindrical portion of the shaft portion 1 so as not to contact each other. It is a writing instrument provided. At this time, the conductive layer 11 has a rectangular shape in which the length direction of the true cylindrical portion of the shaft portion 1 matches the length of the long side, and the long side of the conductive layer 11 is positioned parallel to the center line of the true cylindrical portion. The sheets are installed at equal angular intervals so that they are located on the side surface of the true column. Since the shape of the shaft 1 is a true cylinder, the gripping posture of the user is not restricted and the gripping / writing can be done in any gripping posture like a general writing instrument, so the gripping force for natural writing can be measured. Becomes The quantitative index obtained in this way may be applicable to handwriting recognition technology for each individual such as handwriting identification and electronic signature used for personal identification.
In addition, since the conductive layers 11 are positioned on the side surface of the true columnar portion at equal angular intervals of three sheets, the gripping force distribution for natural writing can be measured, which has the effect of improving the accuracy of handwriting recognition. Then, it is desirable to determine the position of one of the fingers to be gripped (by marking the gripped portion, etc.) for comparison between users and improvement of reproducibility. Also, the number of conductive layers 11 is not limited as long as they do not contact each other, and the more the number of conductive layers 11 becomes, the more detailed the gripping force distribution becomes.

  6A is a writing instrument of FIG. 4 and FIG. 6B is a writing instrument of FIG. 5B. A grip shaft 17 is provided in the innermost layer of the grip portion 2, and a gripping force measuring writing instrument detachable from the shaft portion 1 is provided. It is an example in which it is used as a part. The grip shaft 17 plays a role of a frame that maintains the shape and electric characteristics of the grip part 2 in place of the shaft part 1. Further, the grip shaft 17 has a hole at the center thereof through which the shaft portion 1 can be inserted and removed. As a result, the shaft portion 1 can be attached to and detached from the grip portion 2, so that one grip portion 2 can be used for a plurality of shaft portions 1 having matching hole diameters such as a pencil, a ballpoint pen, a stylus pen, and a brush.

  The grip shaft 17 needs an insulating property to keep the electric characteristics of the grip part 2 constant, and needs elasticity so that the shape does not change before and after attaching and detaching the shaft part 1 so that the shaft part 1 can be attached and detached. Further, the hole provided at the center of the grip shaft 17 preferably has a resin portion 18 in order to prevent the shaft portion 1 from slipping. However, there is no restriction on the hole diameter and shape, the thickness of the resin portion 18, and the installation position as long as there is no slippage with the shaft portion 1 and the size of the entire component can be held and written. For example, if a general pencil or a ballpoint pen is used as the shaft portion 1, the grip shaft 17 is made of a highly rigid rubber material or lightweight plastic, and the resin portion 18 is made of a highly rigid rubber material. If the grip shaft 17 is made of plastic, it is desirable to coat it with a resin having a large friction coefficient.

  By attaching the parts of the gripping force measuring writing instrument of the above configuration to the writing instrument and using it during writing, it is possible to measure the gripping force with any writing instrument, and it is possible to measure the gripping force while changing the writing instrument depending on the writing medium. Become. This allows, for example, the writing medium to be paper and the writing tool to be a ballpoint pen, so that the characters written on the paper can be immediately converted into text, or the writing tool such as a stylus pen can be converted into electronic information for grasping. Since force becomes a new quantitative index in computerization of handwriting, it has the effect of improving the performance of conventional character recognition and handwriting recognition technology.

  As shown in FIGS. 5 and 6, the resin layer 16 may be provided on the outermost surface of the grip portion 2. By providing such a resin layer 16, the conductive sponge 12 and the piezo film 15 can be protected, and at the same time, the texture of the user's grip can be made closer to the grip of a general writing instrument, so that natural writing is possible. It is possible to improve the operability in the gripped state such that Although the thickness of the resin layer 16 is not limited, it is desirable to use a thin resin layer 16 (for example, up to 1 mm) because the main purpose is to measure the gripping force.

  As the writing medium of the writing instrument equipped with the gripping force measurement writing instrument and the grasping force measurement writing instrument having the above-described configuration, the coordinates and the contact pressure of the contact point with the contact object, such as an electrostatic or pressure-sensitive panel, are measured. What can be converted into numerical data may be used. Examples include smartphones and pen tablets. As a result, it is possible to evaluate the quantitative indexes related to the three synchronized writing actions of gripping pressure, contact point coordinates and pressure as numerical data, so it is possible to improve the recognition performance of handwriting and the recording of the handwriting content by comparing each index. Becomes In addition, since the amount of information for personal handwriting increases by recording it as numerical data, there is a possibility that the handwriting identification and the recognition accuracy of the electronic signature can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are examples for embodying the technical idea of the present invention, and the present invention is not limited to the following contents.

(Example 1)
In FIG. 6A, when the mechanical pencil (shaft diameter 7 mm) is used as the shaft portion 1, the grip shaft 17 is formed of PLA resin having an insulating property, and the conductive layer 11 of the copper foil tape (0.07 mm) is used. , Conductive sponge 12 (thickness 5 mm), conductive cloth tape (thickness 0.3 mm, surface resistance value 0.05 Ω / 25 mm or less) with conductive layer 13 and insulating film (thickness 0.05 mm) with both deformability Was formed into an insulated piezo film 15 (nickel copper, thickness 28 μm), and the resin layer 16 of a rubber sheet having a thickness of 0.5 mm and having an insulating property was compressed and fixed to 3 mm from the surface of the grip shaft 17. , A component of a gripping force measuring writing instrument that is detachable from the shaft 1. The hole diameter of the grip shaft 17 is 8 mm, and a rubber sheet having a thickness of 0.5 mm and having an insulating property is attached to the inner surface to form the resin portion 18.

  8 to 14 are diagrams showing the power source 21 (DC 3 V), the resistor 14 (10 MΩ carbon film resistor) one for each conductive layer 11, and the amplification and filter circuit 23 in the first embodiment. The amplifier circuit using the operational amplifier (BU7421) shown in 7 is connected with a vinyl-coated conductor wire having a diameter of 1 mm as shown in FIG. 3 (B), and the lowercase alphabets a to z are actually entered one by one with the data logger as the measuring device 22. 6 is a graph in which the gripping force of each finger is measured. At this time, the practitioners are two people who do not know the structure of the present invention, and write each character within 10 seconds.

  It can be seen from FIGS. 8 to 14 that the waveform is different for each character. In addition, since the writing speed and the gripping force differ depending on the experimenter, the waveforms seem to be different at first glance, but it can be recognized that the same letter is written because the relative sizes and numbers of the mountains are the same. Then, it can be observed that a difference in gripping force is generated for each finger.

(Example 2)
In FIG. 6B, when a mechanical pencil (shaft diameter 7 mm) is used as the shaft portion 1, the grip shaft 17 is formed of a 0.5 mm-thick insulating rubber sheet, and a copper foil tape (0. 07 mm) conductive layer 11, conductive sponge 12 (thickness 5 mm), conductive cloth tape (thickness 0.3 mm, surface resistance value 0.05 Ω / 25 mm or less) with a deformable conductive layer 13 and insulating film (thickness) (0.05 mm) both sides are insulated to form a piezo film 15 (nickel copper, thickness 28 μm), and a resin layer 16 of an insulating rubber sheet having a thickness of 0.5 mm is 3 mm from the surface of the grip shaft 17. It is a component of a gripping force measuring writing instrument that is compressed and fixed as described above and is detachable from the shaft portion 1. The hole diameter of the grip shaft 17 is 7 mm, and the material of the rubber sheet forming the grip shaft 17 is the resin portion 18.

  FIG. 15 shows the power supply 21 (DC 3 V), the resistor 14 (10 MΩ carbon film resistor), one for each conductive layer 11, and the amplification and filter circuit 23 in FIG. An amplifier circuit using an operational amplifier (BU7421) is connected with a vinyl-coated conductor wire having a diameter of 1 mm as shown in FIG. 3 (B), and the gripping force when the actual continuous alphabet “student” is written on the data logger as the measuring device 22. It is the figure which measured the waveform and the piezo film output waveform, and verified whether it could be divided for every character. The measurement targets are the gripping force of the thumb and the output voltage value of the piezo film, which are time-synchronized.

  From FIG. 15, it can be seen that a continuous gripping force waveform is observed, and eight spikes can be observed although they are in the negative direction. The continuous gripping force waveform can be divided into seven by this spike, and the divided waveforms are the waveforms of “s”, “t”, “u”, “d”, “e”, and “n” in FIGS. 8 to 14. You can see that they are very similar. Therefore, it is possible to distinguish between the written characters and to recognize consecutive characters by measuring the grasping force at the same time as the change. At this time, a spike is generated even in a character having two or more strokes, but it is distinctly possible since it is clearly smaller than the spike of a character break.

  The gripping force measuring writing instrument of the present invention provides gripping force as a quantitative index in writing operation. Therefore, by statistically analyzing the gripping force waveform of a specific character, it is possible to discover the difference between beautiful characters and other characters. Therefore, it can be used as a correction index for characters. In addition, since the gripping force can be provided as personal identification information of handwriting verification or electronic signature, it can be used in the field of security and the like.

1 Shaft Part 2 Grip Part 11 Conductive Layer 12 Conductive Sponge 13 Conductive Layer 14 with Deformability Resistor 15 Piezo Film 16 Resin Layer 17 Grip Shaft 18 Resin Part 21 Power Supply 22 Measuring Equipment 23 Amplification and Filter Circuit

Claims (12)

Shaft part,
And a grip portion for gripping provided on the surface of the shaft portion,
The shaft is
Has insulating properties at least in the contact area with the grip,
The grip part is
A writing instrument having at least a conductive layer, a conductive sponge, and a conductive layer elastically deformed when gripped in this order from the surface of the shaft portion. The writing instrument according to claim 1,
A writing instrument comprising a piezo film that is in an insulating state from another at least at a position on the outer surface of the deformable conductive layer. The writing instrument according to claim 1 or 2, wherein
The writing instrument characterized in that the grip portion contact range of the shaft portion has a regular triangular prism shape. The writing instrument according to claim 3,
The conductive layer is
Arranged one by one on the three side surfaces of the regular triangular prism portion of the shaft portion so as not to contact each other,
The conductive layer on each side is
A rectangular type in which the length direction of the shank triangular prism type matches the length of the long side,
The center line parallel to the long side is located on the center line of each triangular prism side surface parallel to the shaft length direction,
A writing instrument characterized by having a shape. The writing instrument according to claim 3,
The conductive layer is
Two pieces are provided on each of the three side surfaces of the regular triangular prism portion of the shaft portion, and a total of six pieces are provided at positions not contacting each other
The two conductive layers on each side are
One each in the range divided on the center line of each triangular prism side surface parallel to the axial length direction,
A writing instrument which is provided at a position equidistant from the center line of each side surface of each triangular prism parallel to the axial direction of the shaft. The writing instrument according to claim 1 or 2, wherein
The writing instrument, wherein the grip portion contact area of the shaft portion has a true cylindrical shape. The writing instrument according to claim 6,
The conductive layer is
There are three pieces on the side surface of the true cylindrical portion of the shaft portion in a position where they do not contact each other,
A rectangular type in which the length direction of the true cylinder part of the shaft part and the length of the long side match.
The long side of the conductive layer is located parallel to the center line of the true cylinder,
A writing instrument characterized in that three pieces are provided so as to be positioned on the side surface of a true cylindrical portion at equal angular intervals. The writing instrument according to any one of claims 1 to 7,
A writing instrument having a conversion device for converting a signal from the grip portion into electronic information. The writing instrument according to any one of claims 1 to 8,
A writing instrument comprising a resin layer on the outermost surface of the grip portion. The writing instrument according to any one of claims 1 to 9,
With the same number of resistors as the number of conductive layers,
A writing instrument characterized in that it outputs a voltage value variation. A part of the writing instrument according to any one of claims 1 to 10, wherein:
The grip shaft provided on the innermost surface of the grip portion has insulation and elasticity,
The grip shaft has a hole for inserting the shaft portion,
A component of a writing instrument, wherein the hole for inserting the shaft portion is provided with a resin layer having frictional properties on the inner surface thereof so that at least the shaft portion does not slip. A writing instrument type device,
Equipped with a writing medium that can measure the coordinates of the point where the writing instrument type device touches,
The writing instrument type device is the writing instrument according to any one of claims 1 to 11,
The gripping force of the writing instrument type device measured by the writing instrument type device and the contact point pressure between the writing instrument type device and the writing medium, and the coordinates of the point at which the writing medium type writing instrument device and the writing medium contact the writing medium,
A writing information system that has the function of measuring and converting numerical data.