JP2007219723A - Electronic pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic pen, when the pen is used for writing on recording paper with dot information by a prescribed pattern absorbing infrared light recorded thereon, which is structured so as not to prevent a reception of the infrared light to reflect the handwriting from the recording paper, and so as not to get a paper surface dirty even when the tip of the pen abuts on the paper surface of necessary. <P>SOLUTION: The pen is structured to maintain a knock state of a knock member while engaging an engaging protruded part of a depressing body with en engaging groove to maintain an opening state of a chucking mechanism of a mechanical pencil body by performing pencil lead delivery by knocking the knock member with the depressing body in accordance with advancement of an operation knob ahead of a vertical hole and by rotating the knob toward a horizontal hole in a state in which the knob is advanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic pen that can leave handwriting on a recording sheet provided with dot information having a predetermined pattern that absorbs infrared light and electronically recognize the handwriting information.

  On recording paper provided with dot information by a predetermined pattern that absorbs infrared light, writing means at the writing tip of the writing unit, light emitting means for irradiating the recording paper with infrared light, and infrared reflected from the recording paper An electronic pen is known which has a light receiving means for receiving light and a processing means for recognizing dot information of a region through which the cursive body has passed based on the reflection state of infrared light and calculating as position data. For example, it is proposed by Unexamined-Japanese-Patent No. 2003-308163 etc. In addition, in order to protect the writing tip of the writing unit, electronic pens equipped with a writing body in / out mechanism that can make the writing tip in and out of the case only during use are already on the market.

  The electronic pen structure provided with the cursive appearance mechanism will be briefly described with reference to the drawings. First, when using the electronic pen, a dedicated recording sheet is required. As shown in FIG. 1, the dedicated recording paper 100 is an ink that absorbs infrared light, and is provided with dots 103 that are shifted from the intersection of the orthogonal lattices 101, 102 either up, down, left, or right. For example, as shown in FIG. 2, the schematic structure of the electronic pen 1 for writing on the recording paper is the writing of the writing unit 4 for writing on the recording paper 100 from the opening 3 a of the tip 3 arranged at the tip of the case 2. The tip 4 a is projected, and the writing tip 4 a can be projected and retracted by the writing body projecting and retracting mechanism 5 accommodated in the case 2. The cursive mechanism 5 is provided with a pressure-sensitive sensor 6 that senses pressure when writing with the writing tip 4a. The front end surface of the case 2 is provided with an infrared light irradiating / receiving hole 104 through which infrared light passes, and means for emitting infrared light behind the infrared light irradiating / receiving hole 104. And a camera 106 which is a means for receiving reflection of infrared light irradiated from the diode 105 onto the recording paper. Further, through the camera 106, processing means 107 that calculates dot information of an area through which the writing tip 4a has passed as position data, a memory (recording means) 108 that records the position data, and the position data are transmitted to the outside. And a power supply unit 110 that supplies power to the above-described units such as the diode 105, the camera 106, and the processing unit 107. The power supply unit 110 is provided with a switch 111, and electricity is supplied to the diode 105 and the camera 106 when the pressure sensor 6 reacts.

  Conventionally, in such an electronic pen, apart from electronic reading of a handwriting, a ballpoint pen in which oil-based ink is contained in a writing unit is mounted so that the handwriting written on a recording sheet can be seen. Of course, handwriting with a ballpoint pen written on paper can be made invisible with sand eraser or correction tape, but this way of erasing can damage the dots on the recording paper or make the dot information unreadable. It will end up. Recently, the usage of the electronic pen has been diversified, and there is a demand for a handwriting that can easily erase the handwriting written on the recording paper.

Furthermore, as another usage of this electronic pen, for example, by bringing the writing tip of the electronic pen into contact with a map provided with dot information similar to the above recording paper on a paper on which a world map is printed, There is also a system in which the electronic pen recognizes the country on the map that touches and emits the country name by voice. In such a usage, since the map is to be used permanently, it is not preferable to attach the ink of the ballpoint pen attached to the electronic pen. Therefore, depending on the purpose, there is a demand for a stylus pen that can be used without leaving a handwriting even when the writing tip is brought into contact with the paper surface.
JP 2003-308163 A

  In view of the above facts, the present invention prevents handwriting from receiving infrared light reflected from the recording paper when writing is performed on the recording paper provided with dot information having a predetermined pattern that absorbs infrared light. In addition, an object of the present invention is to obtain an electronic pen having a structure capable of preventing the paper surface from being soiled even if the writing tip is brought into contact with the paper surface as necessary.

  First of all, the present invention is an electronic pen equipped with a so-called side knock-type writing body projecting and retracting mechanism having an operation knob for extending the writing tip on the side of the case, which is a product already sold as shown in the following conventional figure. It is important to use a structure. Next, the cursive mechanism of the conventional electronic pen used in the present invention will be described in detail with reference to the drawings. FIG. 3 is a front view of a conventional electronic pen. FIG. 4 is a side view of FIG. 3 with a part of the case removed. FIG. 5 is an internal mechanism diagram in the state of FIG. 3, and FIG. 6 is a diagram of the state in which the ballpoint pen body of FIG. 5 is removed. FIG. 7 is a view of a ballpoint pen unit, FIG. 7A is a front view, and FIG. 7B is a view of FIG. 7A viewed from the side. As shown in FIGS. 3 and 4, a front end 3 that can be attached and detached by a screw is disposed in the front portion of the case 2 that forms the outer shell of the electronic pen 1, and an axial center is provided on the side of the case 2. Is provided with an operation hole 2c including a vertical hole 2a that opens in a direction along the vertical direction and a horizontal hole 2b that is orthogonal to the front of the vertical hole 2a, and an operation knob 16a of the pressing body 16 disposed inside the case 2 is provided. It protrudes from the operation hole 2c.

Further, the ballpoint pen body 17 is held by a holding portion 18a of a holding member 18 disposed in the case 2, and the writing tip 17a is accommodated in the front end 3 as shown in FIG. The front end of the front end 3 is brought into contact with the inner surface of the front end 3 to restrict the forward movement, and the knock member 17c disposed at the rear of the shaft tube 17b is brought into contact with the front part of the pressing body 16 provided with the operation knob 16a. I am letting. Although not shown, a spring is disposed inside the ballpoint pen body 17 so that the knock member 17c is always urged rearward. Further, an annular member 19 is attached to the rear portion 16b of the pressing body 16, and a coil spring 20 is attached between the projection 16c formed at the rear end of the pressing body 16 and the annular member 19, and pressed. The body 16 is constantly biased backward.
Further, as shown in FIG. 7, a cam surface 17d is formed on the side surface of the knock member 17c of the ballpoint pen body 17, and the cam surface 17d is formed on the front portion of the pressing body 16 as shown in FIG. The knock member 17c is moved back and forth as the operation knob 16a is moved back and forth, and the knock member 17c is turned as the operation knob 16a is turned.

  Further, a slide hole 17g comprising a vertical slit 17e along the axis and a horizontal slit 17f orthogonal to the front of the vertical slit 17e is formed on the side surface of the shaft cylinder 17b of the ballpoint pen body 17, and the knock member A protrusion 17h formed on the side surface of 17c is inserted through the slide hole 17g. When the writing tip 17a of the ball-point pen body 17 is in the tip 3, the projection 17h is positioned behind the vertical slit 17e of the slide hole 17g, and the operation knob when the projection 17h is in this state. As shown in FIG. 3, 16a is located behind the vertical hole 2a of the operation hole 2c. FIG. 8 is a view of the cursive mechanism in the state of FIG. 3 as seen from the back side. As shown in FIG. 8, the rear portion of the holding member 18 is formed with a sliding groove 18d composed of a longitudinal groove 18b along the axial center and an engaging groove 18c widened in the lateral direction in front of the longitudinal groove 18b. In addition, an engagement protrusion 16e formed on the opposite side of the operation knob 16a of the pressing body 16 is inserted into the sliding groove 18d. When the operation knob 16a is at the position shown in FIG. 3, the engaging protrusion 16e is located at the rear of the vertical groove 18b of the sliding groove 18d.

  FIG. 9 is a diagram showing a state in which the operation knob is operated. FIG. 10 is an internal mechanism diagram in the state of FIG. Moreover, FIG. 11 is the figure which looked at the cursive appearance mechanism in the state of FIG. 9 from the back surface. As shown in FIG. 9, in the conventional writing body retracting mechanism, the writing tip 17a of the ballpoint pen body 17 projects from the opening 3a of the tip 3 by moving the operation knob 16a forward of the vertical hole 2a of the operation hole 2c. Further, the protruding state of the writing tip 17a can be maintained by further rotating the operation hole 2c in the direction of the lateral hole 2b. At this time, inside the case 2, as shown in FIG. 10, the pressing body 16 knocks the knock member 17 c by the advancement of the operation knob 16 a and compresses a spring (not shown) disposed inside the ball-point pen body 17. However, the writing tip 17a is projected. Further, as the pressing body 16 advances, the projection 17h provided on the side surface of the knock member 17c moves to the front of the slide hole 17g, and the cam surface 16d is turned to the cam surface 17d of the knock member 17c by the rotation of the operation knob 16a. And the protrusion 17h is locked to the lateral slit 17f of the slide hole 17g. At this time, on the back side of the pressing body 16, the engaging protrusion 16e of the pressing body 16 advances forward of the sliding groove 18d, and the engaging protrusion 16e engages with the engaging groove 18c by the rotation of the operation knob 16a. As long as the operation knob 16a is not rotated in the opposite direction, the engagement state is maintained, and the writing body retracting mechanism 5 that can perform writing with the protruding writing tip 17a writing is provided. The ball-point pen body 17 has a structure in which a protrusion 18e formed on the holding member 18 is engaged with a slit 17i provided on a side surface of the shaft cylinder 17b, and the shaft cylinder 17b does not rotate even if the operation knob 16a is rotated. Therefore, the ballpoint pen body 17 can only rotate the knock member 17c. Further, as shown in FIG. 10, when the writing tip 17a of the ballpoint pen body 17 is projected, the writing pressure during writing is applied to the shaft cylinder 17b, and the shaft cylinder 17b is disposed on the outer periphery of the knock member 17c. The cylinder 21 is pressed and the pressure sensor 6 mounted on the holding member 18 is pressed and reacted by a flange 21a formed on the cylinder 21.

  Although not shown, infrared light irradiation / light receiving holes are provided at the positions C indicated by broken lines in FIG. 4 to enable infrared light irradiation / light reception, and means for emitting infrared light. A certain diode and a camera as a means for receiving reflection of infrared light from the recording paper based on irradiation of infrared light from the diode are arranged. Further, at the rear part of the case 2, processing means for calculating dot information of a region through which the writing tip has passed as position data, a memory (recording means) for recording the position data, and transmission means for transmitting the position data to the outside And a power supply unit for supplying power to each of the above-described means such as the diode, camera, and processing means.

  The present invention removes the ball-point pen body in the above-mentioned conventional electronic pen writing mechanism, and attaches a mechanical pencil body containing a core that transmits infrared light and can be erased with an eraser to the writing body protruding mechanism. The structure is as follows. Specifically, the writing unit of the writing body feeding mechanism is a mechanical pencil body that contains a core that transmits infrared light and can be erased with an eraser inside the shaft cylinder, and the tip of the mechanical pencil body is the tip of the case. Mount the mechanical pencil body on the case so that it protrudes more constantly, bring the knock member of the mechanical pencil body into contact with the pressing body of the writing body retracting mechanism, and advance the operation knob that protrudes from the side of the case to knock it with the pressing body Knocking out the lead, feeding the lead, and rotating the operation knob at the position where the operation knob has advanced, the engagement protrusion provided on the pressing body is engaged with the engagement groove provided in the case. The knock member is maintained in the knocked state to maintain the open state of the chuck mechanism of the mechanical pencil body. In addition, carbon is contained in a general core, and this carbon absorbs infrared light. Therefore, when writing on the recording paper using this core, accurate dot information can be read by handwriting. It becomes impossible to perform the handwriting information reading function as an electronic pen. Therefore, it is a necessary condition that the core used in the present invention does not absorb infrared light. As a core that does not have carbon and can be erased with an eraser, a kneaded mixture of boron nitride, clay, and an organic polymer compound is extruded to form a color core material. When firing in, the organic polymer compound is removed from the color core material by using an oxidizing atmosphere for part or all of the firing step, and further the color core material of the white porous sintered body A color core obtained by impregnating with ink is disclosed in Japanese Patent Publication No. 51-41376.

  Also, a slide hole comprising a vertical slit along the axial center and a horizontal slit orthogonal to the front of the vertical slit is provided on the side surface of the shaft cylinder of the mechanical pencil body, and a protrusion provided on the side surface of the knock member is provided in the slide hole. When the operation knob is advanced forward of the operation hole, the knock member protrusion advances the vertical slit of the slide hole and rotates the operation body in the lateral hole direction of the operation hole. At this time, the protrusion of the knock member is engaged with the lateral slit of the slide hole, and the chuck mechanism of the mechanical pencil body is kept open.

  Further, a chuck member for sandwiching the core in the chuck mechanism of the mechanical pencil body is formed of a resin material.

  The tip of the mechanical pencil body is formed of a resin material.

  The present invention can provide an electronic pen that can easily carry out the lead-out of the mechanical pencil body by utilizing the above-described conventional electronic pen structure. Because the core uses a core that transmits infrared light and is erasable with an eraser, the handwritten handwriting can be visually recognized and the handwriting can be easily erased with an eraser. The handwriting information can be read as an electronic pen without damaging the dot information on the recording paper. In addition, by maintaining the mechanical pencil chuck in an open state, if the core is retracted in that state, it can be used like a stylus pen without soiling the paper, and a color core with characteristics that make it easier to break is used. However, if the chuck is open, the chuck is open even if it is subjected to an impact caused by dropping or carrying, so that it is difficult to place a burden on the core, and there is an effect of preventing the core from breaking.

  In the invention according to claim 2, since the mechanical mechanism can be kept open even with the mechanical pencil alone as the operation knob is operated, the mechanical pencil body, which is the writing unit, is removed from the case of the electronic pen and stored. If the mechanical pencil chuck is opened, the core housed in the mechanical pencil body is less likely to break.

  In the invention according to claim 3, since the chuck member for clamping the core in the chuck mechanism of the mechanical pencil body is formed of a resin material, even when a color core having a characteristic of being easily broken is clamped by the chuck member, it is applied to the core. The burden can be reduced.

  In the invention according to claim 4, since the tip portion of the mechanical pencil body is formed of a resin material, even when the electronic pen is used like a stylus pen, the contacted surface is damaged by the tip of the mechanical pencil body. It will be difficult.

  Next, embodiments of the electronic pen of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In addition, the same members and the same parts in the drawings are denoted by the same reference numerals. In the present embodiment, the side with the writing tip is expressed as the front.

  FIG. 12 is a front appearance of the electronic pen of this embodiment. FIG. 13 is an internal mechanism diagram in the state of FIG. FIG. 14 is a view of a mechanical pencil body alone, FIG. 14A is a front view, and FIG. 14B is a view of FIG. 14A viewed from the side. An electronic pen 1A shown in FIG. 13 is obtained by removing the tip 3 of the conventional electronic pen 1 from which the ball-point pen body in the state shown in FIG. 6 is removed and mounting the mechanical pencil body shown in FIG. Therefore, description of members, parts, and structures similar to those of the above-described conventional electronic pen is omitted. As shown in FIG. 13, in the electronic pen 1 </ b> A, the mechanical pencil body 27 is mounted on the holding portion 18 a of the holding member 18 and the tip portion 27 a made of a resin material is projected from the opening 3 a of the tip 3. The mechanical pencil body 27 abuts the front portion thereof on the inner surface of the front opening 3 to restrict the forward movement, and the knock member 27c disposed at the rear portion of the shaft tube 27b is pressed by the operation knob 16a. The body 16 is in contact with the front portion.

  Although not shown, the mechanical pencil body 27 is provided with a chuck mechanism in which a resin chuck member and a spring for repelling the chuck member and pinching the core 28 are provided. 27c is always biased backward. In this example, 45 parts by weight of silica as a core was dispersed in about 50 to 100 parts by weight of water, and then 45 parts by weight of boron oxide and 10 parts by weight of polyvinyl alcohol dissolved in about 50 parts by weight of water. In addition, kneading while evaporating water and extruding into a thin line to form a color core material, drying the color core material at 105 ° C., then raising the temperature to 600 ° C. in an oxidizing atmosphere, and oxidizing and firing. Next, the sintered body obtained by heating up to 1100 ° C. in argon gas and baked was immersed in the blue ink, and the blue ink produced by impregnating the blue ink into the pores of the sintered body It is housed inside the shaft cylinder 27b of the mechanical pencil body 27 using a color core.

  As shown in FIG. 14, a cam surface 27d is formed on the side surface of the knock member 27c of the mechanical pencil body 27, and the cam surface 16d is formed on the front portion of the pressing body 16 as shown in FIG. The knock member 27c moves back and forth as the operation knob 16a moves back and forth, and the knock member 27c rotates as the operation knob 26a turns. In the mechanical pencil body 27, the protruding portion 18e formed on the holding member 18 is locked to the slit 27i provided on the side surface of the shaft tube 27b, and the shaft tube 27b does not rotate even when the operation knob 16a is rotated. Because of the structure, the mechanical pencil body 27 can only rotate the knock member 27c. Further, on the side surface of the shaft cylinder 27b of the mechanical pencil body 27, a slide hole 27g comprising a vertical slit 27e along the axis and a horizontal slit 27f orthogonal to the front of the vertical slit 27e is formed. A protrusion 27h formed on the side surface of the member 27c is inserted through the slide hole 27g. In the electronic pen 1A of this embodiment, the operation knob 16a shown in FIG. 12 is moved forward of the vertical hole 2a of the operation hole 2c, so that the knock member 27c is knocked by the pressing body 16 and the lead 28 is extended. This is a writing in / out mechanism 5A. In addition, when writing is performed with the lead 28 extended from the mechanical pencil body 27, the writing pressure during writing is applied to the shaft cylinder 27b of the mechanical pencil body 27, and the shaft cylinder 27b is disposed on the outer periphery of the knock member 17c. The cylinder 21 is pressed and the pressure sensor 6 mounted on the holding member 18 is pressed and reacted by a flange 21a formed on the cylinder 21.

  FIG. 15 is a diagram of the internal mechanism in a state where the operation knob is rotated. Moreover, FIG. 16 is the figure which looked at the cursive appearance mechanism in the state of FIG. 15 from the back surface. In the electronic pen 1A of this embodiment, the operation knob 16a is moved forward and rotated in the direction of the lateral hole 2b of the operation hole 2c, whereby the engagement protrusion 16e slides on the back surface of the pressing body 16 as shown in FIG. It advances forward of the moving groove 18d, and engages with the engaging groove 18c by the rotation of the operation knob 16a. Further, as shown in FIG. 15, in the mechanical pencil body 27, the protrusion 27h of the knock member 27c is engaged with the lateral slit 27f of the slide hole 27g of the shaft cylinder 27b, and the chuck mechanism of the mechanical pencil body 27 is maintained open. To do. The mechanical pencil body 27 has a structure in which 18e formed on the holding member 18 is engaged with a slit 27i provided on a side surface of the shaft cylinder 27b, and the shaft cylinder 27b does not rotate even when the operation knob 16a is rotated. Therefore, the mechanical pencil body 27 can only rotate the knock member 27c. If the lead 28 is pushed into the tip 27a of the mechanical pencil body 27 in this state, the lead does not protrude and the electronic pen 1A can be used as a stylus pen. Even when the core 28 is used while being pulled into the mechanical pencil body 27, the writing pressure is applied to the shaft cylinder 27b of the mechanical pencil body 27, and the cylinder body 21b is disposed on the outer periphery of the knock member 17c. The pressure sensor 6 mounted on the holding member 18 is pressed and reacted by a flange 21a formed on the cylindrical body 21. When the operation knob 16a is rotated in the opposite direction, the engagement protrusion 16e of the pressing body 16 is disengaged from the engagement groove 18c, the protrusion 27h of the knock member 27c is disengaged from the lateral slit 27f, and the operation knob 16a is mechanical pencil. Since the operation knob 16a is moved to the rear of the operation hole 2c by the spring force of the body 27 (not shown) and the coil spring 20 disposed on the pressing body 16, the protrusion 27h of the knock member 2c is moved to the lateral slit 27f. The mechanical pencil body could be removed while the chuck mechanism of the mechanical pencil body 27 was kept open by detaching the tip 3 attached to the tip of the case 2 while being locked.

Since the electronic pen of the present invention can easily erase the handwriting written on the dedicated paper with an eraser, for example, when the recording paper is used as an answer column for a problem as an application for infants and children, In addition to being able to rewrite the answer in the answer column as many times as possible, the final answer can be recorded as a record on the recording paper, and electronic data can be recorded. Also, unlike a ballpoint pen, a mechanical pencil does not have to worry about ink flowing back into the electronic pen even when it is subjected to an impact such as dropping. There is no worry that the writing quality will deteriorate even when writing is performed, and the mechanical pencil core is not adversely affected by heat unlike ball-point pen ink, so it can be used under severe conditions.

Conceptual diagram of recording paper Electronic pen structure with conventional cursive mechanism. It is the front external appearance of the conventional electronic pen. FIG. 3 is a side view of the case with a part of the case removed. It is an internal mechanism figure in the state of FIG. It is a figure of the state which removed the ball-point pen body of FIG. FIG. 7A is a front view and FIG. 7B is a view of FIG. 7A viewed from the side. It is the figure which looked at the cursive appearance mechanism in the state of FIG. 3 from the back surface. It is a figure of the state which operated the operation knob. It is an internal mechanism figure in the state of FIG. It is the figure which looked at the cursive appearance mechanism in the state of FIG. 9 from the back surface. It is a front external appearance of the electronic pen of a present Example. It is an internal mechanism figure in the state of FIG. FIG. 14A is a front view and FIG. 14B is a view of FIG. 14A viewed from the side. These are figures of an internal mechanism in the state where the operation knob was rotated. It is the figure which looked at the cursive appearance mechanism in the state of FIG. 15 from the back surface.

Explanation of symbols

100 ... recording paper, 101, 102 ... lattice, 103 ... dot,
1,1A ... Electronic pen,
2 ... Case, 2a ... Vertical hole, 2b ... Horizontal hole, 2c ... Operation hole,
3 ... front entrance, 4 ... writing unit, 4a ... writing tip,
5,5A ... Cursive appearance mechanism,
6 ... Pressure-sensitive sensor, 104 ... Infrared light irradiation / light-receiving hole, 105 ... Diode,
106 ... Camera, 107 ... Processing means 107, 108 ... Memory (recording means),
109 ... transmission means, 110 ... power supply, 111 ... switch,
16 ... Pressing body, 16a ... Control knob, 16b ... Rear part, 16c ... Protrusion part,
16d: cam surface, 16e: engagement protrusion,
17 ... Ball-point pen body, 17a ... Writing tip, 17b ... Shaft cylinder, 17c ... Knock member,
17d ... Cam surface, 17e ... Vertical slit, 17f ... Horizontal slit,
17g ... slide hole, 17h ... projection, 17i ... slit,
18 ... holding member, 18a ... holding portion, 18b ... vertical groove, 18c ... engaging groove,
18d ... sliding groove, 18e ... projection, 19 ... annular member,
20 ... coil spring, 21 ... cylindrical body, 21a ... flange,
27 ... mechanical pencil body, 27a ... tip, 27b ... shaft cylinder,
27c ... knock member, 27d ... cam surface, 27e ... vertical slit,
27f ... Horizontal slit, 27g ... Slide hole, 27h ... Projection, 27i ... Slit,
28 ... Core.

Claims (4)

  An operation hole comprising a vertical hole along the axis and a lateral hole orthogonal to the front of the vertical hole is provided outside, and includes a vertical groove along the axis and an engagement groove widened in front of the vertical groove. A pressing body having an operation knob that slides in the operation hole and an engagement protrusion that slides in the engagement groove is repelled rearward by a coil spring in a case having a sliding groove formed therein. Then, by advancing the operation knob to the front of the operation hole, the writing tip of the writing unit detachably mounted in the case was protruded from the tip opening screwed to the tip of the case, and the operation knob was advanced. The writing body in / out structure has a structure that maintains the protruding state of the writing tip of the writing unit by engaging the engaging protrusion of the pressing body with the engaging groove in the case by rotating in the horizontal hole direction of the operation hole at the position On the recording paper with the mechanism and dot information with a predetermined pattern that absorbs infrared light When writing at the writing tip of the writing unit, the light emitting means for irradiating the recording paper with infrared light, the light receiving means for receiving the infrared light reflected from the recording paper, and the reflection state of the infrared light are also included. In addition, the electronic pen is provided with processing means for recognizing dot information of the area where the writing tip has passed and calculating as position data, and the writing unit transmits infrared light inside the shaft tube and is erased with an eraser. A mechanical pencil body containing a possible core, the mechanical pencil body is mounted on the case so that the tip always protrudes from the tip, and the knock member of the mechanical pencil body is brought into contact with the front of the pressing body, When the knob is advanced forward of the vertical hole, the knock member is knocked by the pressing body to feed out the core, and the operation knob is rotated in the direction of the horizontal hole while the operation knob is advanced. Electronic pen, characterized in that the structure to maintain the open state of the mechanical pencil of the chuck mechanism to maintain a more knock state of the knocking member causes the engaging projection of the pressing member engaged with the engaging groove.   The mechanical pencil body is provided with a slide hole including a vertical slit along the axial center and a horizontal slit orthogonal to the front of the vertical slit on the side surface of the shaft cylinder, and the protrusion provided on the side surface of the knock member in the slide hole When the operation knob is advanced forward of the operation hole, the protrusion of the knock member advances the vertical slit of the slide hole, and the operation body is moved in the direction of the horizontal hole of the operation hole. 2. The structure according to claim 1, wherein when the pivot member is rotated, the protrusion of the knock member is engaged with the lateral slit of the slide hole to maintain the chuck mechanism of the mechanical pencil body in an open state. Electronic pen.   The electronic pen according to claim 1 or 2, wherein a chuck member for sandwiching the core in the chuck mechanism of the mechanical pencil body is formed of a resin material. The electronic pen according to any one of claims 1 to 3, wherein a tip portion of the mechanical pencil body is formed of a resin material.

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