JPH064297Y2 - Writing instrument for gripping pressure measurement - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a writing instrument for measuring a gripping pressure during writing.

[Prior art and its problems]

Writing instruments are written by being held by the thumb, forefinger, middle finger, and shoulder of the hand at four points. The gripping pressure of each part differs depending on the writer, and the difference in the handwriting of each person also depends on this gripping pressure. Often derived from differences. Therefore, if the gripping pressure at each part of the writing instrument can be accurately analyzed, it can be used for handwriting recognition first, and further, three-dimensional control such as character practice and correction when habiting, fingertip rehabilitation, robot precision control, etc. It can be applied to a wide range of fields. However, conventionally, there is no writing instrument that can accurately analyze the gripping pressure, and therefore, the handwriting has not been identified based on the analysis result of the gripping pressure.

[Purpose of device]

Therefore, the object of the present invention is to provide a writing pressure measuring writing instrument capable of accurately analyzing the holding pressure of each part of the shaft of the writing instrument and widely applicable to various fields including handwriting identification. It is what

[Construction of the Invention] The writing instrument for gripping pressure measurement of the present invention is formed by dividing the shaft cylinder into three elastic pieces by inserting three slits at approximately equal intervals in the longitudinal direction of the shaft cylinder made of an elastic material. A resistance wire strain gauge is attached to each elastic piece, and a waveform corresponding to the amount of deformation of the elastic piece during writing is recorded, and the gripping pressure during writing is analyzed from this waveform.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows a perspective view of a use state. The shaft cylinder 1 is a cylindrical shape made of a thin elastic material, and a writing portion 2 such as a ballpoint pen is attached to the tip of the shaft cylinder 1 for writing. .
The shaft cylinder 1 has three slits 11 at equal intervals in the longitudinal direction. As shown in FIG. 2, three elastic pieces are provided.
12 are formed, and the elastic tube 12 constitutes the barrel 1. Therefore, at the time of writing, the thumb, forefinger, and middle finger are brought into contact with the respective elastic pieces 12 to elastically deform them, and the resistance wire strain gauge 3 is attached to the back side of these abutting portions. Further, the rear portion of the elastic piece 12 comes into contact with the shoulder of the hand, and the strain gauge 3 is also attached to this portion.

Each of these strain gauges 3 is incorporated in a normal Wheatstone bridge circuit shown in FIG. 3, and the waveform of the change in its resistance value is read by the oscilloscope 4 and the waveform is recorded by the printer. FIG. 4 shows an example of the waveforms of the thumb A and the index finger B. These waveforms correspond to changes in the gripping pressure of each finger during writing.

Although various methods are conceivable for analyzing this waveform, CA
By calculating the area of each waveform by D (Computer Aided Design) and measuring the area ratio B / A, the waveform becomes a measured value. And as a result of various investigations,
The waveforms are considerably different if the writer is different, but if the same person writes, there is a high degree of accuracy and reproducibility, and it is possible to judge that the same person has a very high probability. However, if the amount of information is small, such as a sign with a single letter, it is difficult to put it on CAD,
In addition, there is a problem that the information changes because the individual characteristics are not fixed in the brain except adults, but it is estimated that the change in the sign with time will be extremely small within 3 years. , It was found that the writing instrument of the present invention can be used for handwriting appraisal on the premise that it is "handwriting within a short period of time for an adult." Further, the present invention is not limited to handwriting appraisal, and as described above, the present invention can be applied to various fields including correction of how to write characters.

[Effect of device]

As described above, the writing instrument for gripping pressure measurement of the present invention is
By forming three slits at equal intervals in the longitudinal direction of the shaft cylinder made of elastic material, the shaft cylinder is divided into three elastic pieces and formed.
Since a resistance wire strain gauge was attached to each elastic piece to record a waveform corresponding to the amount of deformation of the elastic piece during writing, CAD can be used to accurately analyze the gripping pressure during writing. It is possible to provide a writing instrument for gripping pressure measurement that can be widely applied to various fields including handwriting identification.

[Brief description of drawings]

FIG. 1 is a perspective view of a use state of an embodiment of the present invention, FIG. 2 is a sectional view, FIG. 3 is an explanatory diagram of a circuit, and FIG. 4 is an explanatory diagram of waveforms. 1 …… Shaft cylinder, 11 …… Slit, 12 …… Elastic piece 3 …… Strain gauge

Claims (1)

[Scope of utility model registration request] 1. A shaft cylinder made of an elastic material is formed by dividing the shaft cylinder into three elastic pieces by inserting three slits at substantially equal intervals in the longitudinal direction, and each elastic piece has a resistance line strain. A writing instrument for measuring a gripping pressure, characterized in that a gauge is attached to record a waveform corresponding to a deformation amount of an elastic piece at the time of writing, and the gripping pressure at the time of writing is analyzed from the waveform.