JP2015077745A - Pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pencil which allows writing and inputting to an electrostatic input device with a simple structure at low cost so that many school children can use it.SOLUTION: A lead 2 formed by baking-solidification of clay and graphite is disposed on groove parts 40a, 50a disposed on plural shaft members 4, 5 forming a shaft body 3, and the plural shaft members 4, 5 are coupled for holding the lead 2 by the shaft body 3, thereby a pencil 1 is constructed. A conductive sheet 60 having conductivity is sandwiched by the plural shaft members 4, 5 in a contact state, and an inside edge N of the conductive sheet 6 is disposed continuously to the lead 2, and an outside edge G of the conductive sheet 6 is exposed from an outer surface 3a of the shaft body 3.

Description

  The present invention relates to a pencil including a core obtained by baking graphite and clay and a shaft body that holds the core.

  Pencils are offered at a low price because of their simple structure, and are used in a considerable proportion, especially for elementary school children and other schoolchildren. Pencils are designated for use at school exams and public exams. In many cases, the demand is high even now that the computerization has progressed.

  On the other hand, a thin touch panel type input device used by hand as described in Patent Document 1 has gained popularity in the market, and the input screen of an electrostatic input type input device is touched with a fingertip. As disclosed in Patent Document 2, the input screen of the input device is handled in the same way as paper with an input pen provided with an input portion made of conductive rubber in front of the input screen. There is a growing demand for input pens that can draw pictures and write letters on them.

  In recent years, it has been considered that the touch panel type input device described above can be used by displaying electronic textbook data on the screen of the input device in classes at school, in addition to use for work or hobbies. . Considering the added value of pencils that have been used for a long time under such circumstances, although it is in a situation where innovative performance improvement is not so much expected due to improvement in writing taste, etc., it is a long time to write on paper In contrast to technology, it is necessary to consider a new added value of a pencil only in the present age when a new technology of inputting to an input device with an input pen is widely spread.

JP 2011-81825 A Japanese Patent No. 4142276

  The inventors of the present application have focused on the fact that the core of the pencil is an insulator because it is generally molded from wood, but the graphite and clay core is a good conductor that conducts electricity, Utilizing such a property of pencils, it is possible to provide a pencil that can be written and input to an electrostatic input type input device with a simple structure at a low cost so that many school children can use it. Aimed.

The present invention
“1. A structure in which a core obtained by baking and hardening graphite and clay is arranged in a groove provided in a plurality of shaft members forming a shaft body, and the plurality of shaft members are coupled to hold the core by the shaft body In this pencil, the conductive sheet having conductivity is held in contact with the plurality of shaft members, and the inner edge of the conductive sheet is connected to the core, and the outer edge of the conductive sheet The pencil is characterized in that the portion is exposed from the outer surface of the shaft body.
2. 2. The pencil according to item 1, wherein the conductive sheet has flexibility and machinability. It is.

  The shaft member forming the shaft body in the present invention is preferably formed of a material having good cutting properties such as wood or a resin material so that the core can be exposed by cutting the tip portion of the shaft body into a tapered shape. In addition, if wood used in general pencils is used for the shaft member, not only can it provide a particularly inexpensive one, but the writing comfort at the time of writing is close to that of general pencils. This makes it suitable for school children. In addition, the hardness of the lead is preferably 2B or softer so as not to damage the operation area which is the input screen of the input device.

  In addition, the conductive portion in the present invention has a full length of the shaft body so that the user can touch the conductive portion regardless of where the user grips the shaft body or the pencil is shortened by shaving the shaft body. It is preferable to expose the outer edge of the conductive part across the conductive sheet, such as a metal foil or a carbon sheet, sandwiched in contact with the surface of the core and the shaft member, What is necessary is just to comprise so that an outer edge part may be exposed from the outer surface of a shaft. In this case, when the conductive sheet is sandwiched between the shaft members, it is preferable that the conductive sheet has flexibility so as to become familiar with the shape of the columnar core and the semicircular groove portion in which the core of the shaft member is disposed. Like the shaft body, it is preferable to have a machinability that can be sharpened with a pencil sharpener.

  In the present invention, writing on paper can be performed with the core exposed by shaving the shaft body, and the user's hand touches the conductive portion exposed from the outer surface of the shaft body, so that the tip of the core connected to the conductive portion can be used. A pencil that can be input to an electrostatic input device can be obtained with a simple structure.

FIG. 1 is a perspective view of a pencil in the first embodiment. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a diagram showing a manufacturing process of the pencil shown in FIG. FIG. 4 is a diagram showing a state where writing is performed on paper with the pencil shown in FIG. FIG. 5 is a diagram showing a state in which the pencil shown in FIG. 1 is used for input to the capacitance type input device.

Next, specific examples of embodiments of the present invention (hereinafter referred to as examples) will be described with reference to the drawings, but the present invention is not limited to the following examples.
In addition, in order to make the explanation easy to understand, the same numbers are given to the same members and the same parts in the drawings.

The present embodiment will be described with reference to FIGS.
FIG. 1 is a perspective view of the pencil of this embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
The pencil 1 has a structure in which a core 2 made of baked graphite and clay is held by a shaft 3 having a hexagonal cross section formed of wood, and the tip of the shaft 3 is sharpened into a conical shape by pencil sharpening. The tip part 2a of 2 is exposed.
Between the two shaft members 4 and 5 forming the shaft body 3, a conductive portion 6 made of a carbon sheet 60 having conductivity is provided. The carbon sheet 60 is bonded by applying an adhesive between the core 2 and the shaft members 4 and 5, and the conductive portion 6 made of the carbon sheet 60 is located between the core 2 and the shaft member 4. It has a semicircular portion 6 a and a flat portion 6 b located between the shaft member 4 and the shaft member 5.
Further, the outer edge G of the flat portion 6 b of the conductive portion 6 is exposed from the outer surface 3 a of the shaft cylinder 3 over the entire length of the shaft body 3, and the user's hand holding the shaft body 3 on the conductive portion 6. Is to touch. Since the inner edge N of the conductive portion 6 (plane portion 6b) is electrically connected to the core 2, the core 2 and the outer edge G of the conductive portion 6 are electrically connected. Conducted to.

Next, the manufacturing process of the pencil of a present Example is demonstrated using FIG. 3 shows the cross-sectional direction of the pencil as in FIG. 2. In FIG. 3A, the plate member 40 forming the shaft member 4 shown in FIG. 2 is provided with a plurality of semicircular groove portions 40a. . A plurality of semicircular groove portions 50a are provided on the plate member 50 forming the shaft member 5 shown in FIG.
A core 2 made of baked and hardened graphite and clay is disposed in a gap between the groove portion 40a and the groove portion 50a, and a flexible carbon sheet 60 is disposed between the plate material 50 and the core 2, so that the plate materials 40, 50 are disposed. Adhesive (not shown) is applied to the contact surfaces of the core 2 and the core 2 and the carbon sheet 60, and the plate 40 and the plate 50 are overlapped to bond the plate 40, the plate 50, the core 2 and the carbon sheet 60 It is as a unity.
3B, by cutting the V grooves 40c and 50c above and below the plate material 40 and the plate material 50, the pencil 1 as shown in FIG. 2 is formed. In this embodiment, the thickness T2 of the plate material 50 is made thinner than the plate thickness T1 of the plate material 40 in consideration of the thickness of the carbon sheet 60 so that the pencil 1 becomes a regular hexagon in the state of FIG. 3C. The radius R2 of the semicircular groove portion 50a is larger than the radius R1 of the semicircular groove portion 40a of the plate member 40.

  Next, the state of writing on the paper surface with the pencil 1 of the present embodiment will be described with reference to FIG. As shown in the drawing, the pencil 1 was able to write a character 110 a on the paper 110 at the tip 2 a of the core 2.

  Next, with reference to FIG. 5, a state in which the pencil 1 of this embodiment inputs to the capacitance type input device will be described. As shown in the drawing, when the pencil 1 is slid while the tip 2a of the lead 2 is brought into contact with the operation area 110a of the capacitive input device 110, the conductive part 6 of the shaft body 3 gripped by the user is connected. An electrostatic change was generated in the operation area 110a through the core 2, and a line 110b could be drawn on the screen of the image creation software.

DESCRIPTION OF SYMBOLS 1 ... Pencil, 2 ... Core, 2a ... Tip part, 3 ... Shaft, 3a ... Outer surface,
4 ... shaft member, 5 ... shaft member,
40 ... Plate material, 40a ... Semicircular groove, 40b ... V groove,
50 ... Plate material, 50a ... Semicircular groove, 50b ... V groove,
6 ... conductive portion, 60 ... carbon sheet,
N ... inner edge, G ... outer edge,
100 ... paper, 100a ... characters,
110 ... input device, 110a ... operation area, 110b ... line.

Claims (2)

In a pencil having a structure in which a core obtained by baking and hardening graphite and clay is arranged in a groove portion provided in a plurality of shaft members forming a shaft body, and the core is held by the shaft body by connecting the plurality of shaft members. The conductive sheet having conductivity is held in contact with the plurality of shaft members, the inner edge of the conductive sheet is connected to the core, and the outer edge of the conductive sheet is connected to the core. A pencil configured to be exposed from the outer surface of the shaft body. The pencil according to claim 1, wherein the conductive sheet has flexibility and machinability.

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