JP3929297B2 - Shaft tube for writing instrument or input pen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft for a writing instrument or an input pen.
[0002]
[Prior art]
In recent years, in writing instruments and input pens for personal digital assistants, electronic members such as barcode readers, pen pressure sensors, and pressure sensors have been attached to the rear end of the barrel to improve convenience. Is desired. In addition, for example, a shaft with respect to a so-called magnetic panel in which a dispersion liquid in which a magnetic material having a south pole surface colored green and a north pole surface white is dispersed in a liquid having a yield value is sealed between a transparent front plate and a back plate is used. In the so-called magnetic pen, which displays the writing line by bringing the writing magnet attached to the tip of the cylinder close, the width of the rear end of the shaft cylinder has a magnetic pole at the tip of the writing tool magnet and a rear end of a different polarity. It is desired to install a wide erasing magnet to facilitate the erasing workability.
[0003]
[Problems to be solved by the invention]
By the way, recently, as a shape of a writing instrument, an input pen, and the like, a shape in which a curved surface shape is frequently used as an outer surface shape along the longitudinal direction of the shaft tube can be seen. When a heavy member such as a bar code reader or a magnet as described above is attached to the rear end of a shaft cylinder such as a writing instrument or input pen having such a shape, when the shaft cylinder is laid on a desktop or other plane As shown in FIG. 3, the curved surface portion may come into contact with the top surface of the desk and the shaft tube may oscillate, or in particular, a bulging curved surface converging toward the shaft core may be formed at the rear portion of the shaft tube. In addition, the front part of the shaft cylinder floats with the bulging curved surface as the contact point with respect to the desk surface due to the weight of the rear part, becomes unstable, the shaft cylinder rotates and rolls by a slight impact on the shaft cylinder, and falls from the desk There was a problem of doing.
[0004]
In view of these facts, the present invention has a bulging curved surface converging toward the axis at the rear part, and the front part is rearward when lying on a flat surface even if the rear end part is heavier than the front end part. An object of the present invention is to propose a writing instrument or an input pen shaft cylinder that does not float with a bulging curved surface as a contact point with respect to a flat surface due to the weight of the part.
[0005]
[Means for Solving the Problems]
Next, the present invention devised to solve the above problems will be described.
“1. It has a bulging curved surface converging toward the axis at the rear part, and the rear part is heavier than the front part, and when lying on the plane, the front part has a bulging curved surface with respect to the plane with the weight of the rear part. In a writing instrument or an input pen shaft cylinder that floats as a contact point, the front surface of the shaft cylinder is lifted by always contacting the outer surface of the shaft cylinder with the shaft cylinder lying on a plane. Protrusions for preventing this are provided .
2. The shaft cylinder has a shape in which a protruding piece is provided in the rear part, which is orthogonal to the axis of the axis cylinder and orthogonal to an imaginary line connecting the convex part and the axis. "
[0006]
In the present invention, by providing a convex portion on the outer surface of the shaft tube, when the shaft tube is laid on a flat surface, the bulging curved surface comes into contact with the flat surface due to the weight of the rear portion, and the shaft tube is inclined rearward. However, the convex portion in the present invention prevents the bulging curved surface from coming into contact with the flat surface or prevents swinging to the rear end side of the shaft cylinder even if it comes into contact. There is no particular limitation on the shape, size, position, and the like except for the limitation that the convex portion must contact the flat surface when the shaft cylinder is laid down.
[0007]
In addition, the projecting piece that is orthogonal to the axial center of the axial cylinder and orthogonal to the imaginary line that connects the convex part and the axial core is provided at the rear portion of the axial cylinder because the outer shape of the axial cylinder is round and easy to roll. However, since the protruding piece serves as a support and prevents the shaft cylinder from rotating, the convex portion can contact the plane without rolling and escaping, and the front portion of the shaft cylinder can be prevented from rising.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, in order to facilitate understanding of the present invention, description will be made with reference to the drawings. In the present embodiment, the shaft of a magnetic pen provided with a writing magnet and an erasing magnet for erasing the magnetic panel will be described. However, the present invention is limited to the shaft of a magnetic pen. Not a thing. It can be used for a ballpoint pen, a mechanical pencil, or an input pen of a portable information terminal. In the present embodiment, the direction with the writing magnet of the magnetic pen is expressed as the front, and the direction with the erasing magnet is expressed as the rear. When the same member and the same part are shown, the same code | symbol is attached | subjected.
[0009]
The shaft cylinder of the magnetic pen according to the present embodiment will be described with reference to FIGS. FIG. 1 is a figure of the magnetic pen of the present embodiment, and FIG. 2 is a cross-sectional view showing a state when the magnetic pen is laid on the surface plate of the magnetic panel. In the magnetic pen 1, a writing magnet 5 made of a small cylindrical magnet is mounted on the front portion 3 of the shaft cylinder 2 via a receiving member 4. Further, a projecting piece 7 that expands rearward is connected to the rear portion 6 of the shaft cylinder 2, and the rear end opening 7 a of the projecting piece 7 is an erasure made of a wide rectangular magnet. A magnet 8 is attached. The writing magnet 5 and the erasing magnet 8 are for erasing the magnetic panel 10 shown in FIG. 2. For example, the writing magnet 5 has the front end 5a as the S pole, and the erasing magnet 8 has the rear end. 8a is an N pole.
[0010]
The shaft cylinder 2 has a conical portion 2a that gradually increases in diameter from the front portion 3 toward the base portion 7b of the protruding piece 7 formed in the rear portion 6, and the rearward from the maximum diameter portion 2b of the conical portion 2a to the shaft core. The bulging curved surface 2c converges toward the surface. A hemispherical convex portion 9 is formed in the vicinity of the maximum diameter portion 2b in front of the bulging curved surface 2b.
[0011]
Next, the magnetic panel 10 will be briefly described with reference to FIG. The magnetic panel 10 of FIG. 2 schematically represents the panel structure, and the scale ratio is different from the actual one. The magnetic panel 10 includes a transparent surface plate 14 and a back plate, which are obtained by dispersing a magnetic material 11 having an S pole face green and an N pole face white in a liquid 12 having a yield value to form a dispersion liquid 13. 15 and a partition wall 16 provided between the plates. Further, in the drawing, the magnetic body 11 gives an N-pole magnetic force from the surface plate 14 side, and the S pole surface is arranged on the surface plate 14 side, and the surface plate 14 side of the magnetic panel 10 is in a green state. is there.
[0012]
Although not shown in the drawing, writing is performed by bringing the front end 5a (S pole) of the writing magnet 5 of the magnetic pen 1 closer to the surface plate 14 in a green state, whereby the magnetic body 11 is inverted, A white N pole surface appears on the surface plate 14 side, and a white writing line is drawn on a green background. Further, by bringing the rear end 8a (N pole) of the erasing magnet 8 of the magnetic pen 1 closer to the white writing line, the magnetic body 11 is re-inverted so that the green S pole surface faces the surface plate 14 side. Appears again and becomes a green panel. Thus, since the erasing magnet 8 is used as an eraser, it is preferable that the contact area with the surface plate 14 is large, and the rear end 8a is wide, so that the volume is large and heavy. .
[0013]
Next, the operation when the magnetic pen of the present embodiment is laid on a plane will be described. FIG. 3 is a comparative view for facilitating understanding of the operation of the magnetic pen of the present embodiment, and is the same as the magnetic pen 1 of the present embodiment except that there is no convex portion in front of the bulging curved surface. It is. When the magnetic pen 101 shown in FIG. 3 is laid on the surface plate 14 (in a broken line state), the shaft cylinder 2 falls backward due to the weight of the erasing magnet, and the bulging curved surface 2c comes into contact with the surface plate 14 As a point, the front part is in an unstable state (solid line state). On the other hand, as shown in FIG. 2, the magnetic pen 1 according to the present embodiment has the convex portion 9 in front of the bulging curved surface 2c, thereby preventing the bulging curved surface 2c from contacting the surface plate 14. The cylinder 2 does not swing to the erasing magnet 8 side, and the front portion 3 is prevented from floating. Further, in the present embodiment, the projecting piece 7 is formed orthogonal to the axis of the shaft cylinder 2 and orthogonal to a virtual line (not shown) connecting the convex portion 9 and the axis. Even if the cylinder 2 is likely to rotate in the circumferential direction of the shaft, the protruding piece 7 supports and prevents the rotation of the shaft cylinder, and the convex portion 9 is reliably brought into contact with the surface plate 14.
[0014]
【The invention's effect】
Since the present invention has the structure as described above, it has a bulging curved surface converging toward the axial center in the rear part, and even if the rear end part is a heavier cylinder than the front end part, No longer floated.
[Brief description of the drawings]
FIG. 1 is a view of a magnetic pen showing an embodiment of a shaft cylinder of the present invention.
FIG. 2 is a cross-sectional view showing a state when a magnetic pen is laid on a surface plate of a magnetic panel.
FIG. 3 is a comparative diagram for facilitating understanding of the operation of the magnetic pen according to the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Magnetic pen, 2 ... Shaft cylinder, 2a ... Conical part, 2b ... Maximum diameter part, 2c ... A bulging curved surface,
3 ... front part, 4 ... receiving member, 5 ... writing magnet, 5a ... front end,
6 ... rear part, 7 ... projecting piece, 8 ... erasing magnet, 8a ... rear end, 9 ... convex part.

Claims (2)

It has a bulging curved surface converging toward the axis at the rear part, and the rear part is heavier than the front part. In a shaft for a writing instrument or an input pen that is in a floating state, in order to prevent the front portion of the shaft tube from being lifted by being always in contact with the outer surface of the shaft tube while the shaft tube is laid on a plane. A writing tube or a shaft cylinder for an input pen , characterized in that a convex portion is provided . 2. The shape according to claim 1, wherein the shaft tube has a shape in which a projecting piece is provided at a rear portion, which is orthogonal to an axis of the shaft tube and orthogonal to a virtual line connecting the convex portion and the shaft core. Shaft tube for writing instruments or input pens.

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