KR20020017942A - Character input device - Google Patents

Abstract

PURPOSE: A device for inputting text messages is provided to offer the usage of small devices such as a cellular phone, a PDA(Personal Digital Assistant), or a remote controller in inputting a text by having a luminous element and a light receiving element on a pointing pen and a keypad unit receive the infrared light from the luminous element of the pointing pen, and simplifying a circuit composition. CONSTITUTION: The pointing pen comprises a power supplying unit, a switch connecting the luminous element with the power supplier, a cylinder contact-poll being able to be inserted in the pen and being exposed the end part, a cylinder conducting cover covering the exterior of the contact-poll, being cooperated with the pen, being inserted in the contact-poll, and turning the power on by contacting to the switch, a spring stopper supporting a spring, and the spring being inserted between the switch and the stopper. A keypad unit consists of few light sensors, a decoder unit scanning the sensors when one of them is turned on, a circuit board including an interface device receiving and sending key-code value from the decoder to an exterior device, and a cover having the holes confronting to a plurality of light receiving elements in order to enable each light receiving element to be inserted to the holes.

Description

Character input device

The present invention relates to a character input device, and more particularly, wherein a light emitting element and a light receiving element are separately installed in a pointing pen and a keypad unit, and the pointing pen emits light when the pointing pen is brought into contact with a key input unit formed in the keypad unit. An element is operated, and infrared rays are radiated therefrom and transmitted to the light-receiving element of the keypad so that the character can be input.

A character input device used in a mobile terminal such as a cellular phone or a small terminal device such as a PDA does not include a character button for inputting a character due to the size limitation of the main body, and is composed of a numeric button and a minimum function button. Therefore, in order to input a character, it is generally processed by the combination of the number button and the function button. This is because, in the small terminal device having a character input unit composed of key buttons similar to a keyboard of a computer, there is a difficulty due to a circuit configuration and size limitation.

However, according to the related art, it is inconvenient to operate a keypad several times while looking at a liquid crystal display window in order to input a single character. there was. In addition, the problem described above is the same for the remote control device that requires text input, such as a remote control used in a set-top box for providing the Internet through a TV.

The present invention has been made in view of the above, and an object of the present invention is to provide a text input device that can be used in a small terminal device such as a mobile phone, a PDA, a remote control, and the like. That is, according to the present invention, when the light emitting device and the light receiving device are separately installed in the pointing pen and the keypad, the light emitting device of the pointing pen operates when the pointing pen is pressed in contact with the key input unit formed in the keypad. It is an object of the present invention to provide an ultra-small and ultra-thin character input device with a simplified circuit configuration by being transmitted to the light receiving element of the keypad.

1 is a perspective view of a mobile communication terminal employing a character input device according to the present invention,

2 is an exploded perspective view showing an enlarged portion of the character keypad according to the present invention;

3 is a cross-sectional view of the character keypad portion according to the present invention.

4 is a front view of the character keypad unit according to the present invention;

5 is a cross-sectional view showing an embodiment of a pointing pen according to the present invention;

6 is a cross-sectional view showing another embodiment of a pointing pen according to the present invention;

7 is a circuit diagram illustrating a printed circuit board inside a character keypad according to the present invention;

8 is a cross-sectional view and a part sectional view showing yet another embodiment of a pointing pen according to the present invention.

<Description of Drawing Major Symbols>

Character keypad, 2. pointing pen,

5 .. printed circuit board, 6 .. light receiving element,

7 .. top cover, 8 .. hole,

9. bend, 10. battery,

11. light emitting element, 12. switch,

13. Switch, 14. Contact rod,

15 .. cylindrical cover, 16 .. stopper,

17 .. contact rod, 18. buffer,

19 .. tact switch, 20 .. thin battery,

21 .. connecting line, 22 .. top separating means,

23. Lowering means, 24. Cylindrical lens

Character input device according to the invention is characterized in that it comprises a pointing pen including a light emitting element and a keypad portion in which a plurality of light receiving elements are arranged in a matrix form.

In the above character input apparatus, the pointing pen may be provided with switch means for turning on / off a light emitting element.

In the character input apparatus, the switch means is turned on when the pointing pen is pressed against each key input part of the keypad and turned off when it is separated from the key input part.

In the character input apparatus, the switch means is a tact switch.

In addition, according to another aspect of the character input apparatus according to the present invention, the pointing pen includes a power supply unit for supplying power; A switch connected to the power supply unit and the light emitting element; A transparent cylindrical contact rod which is partially exposed to the outside of the pointing pen and can be inserted into the pointing pen; A conductive cylindrical cover surrounding the outside of the contact rod and interlocked with the pointing pen so that the contact rod is inserted together when the contact rod is inserted into the pointing pen, the end of which is in contact with the switch to turn on the light emitting element; A spring stopper formed to protrude outwardly in a longitudinal position of the cylindrical cover to support the spring; And a spring installed to surround the outer periphery of the cylindrical cover at a position between the spring stopper and the switch, wherein the keypad unit is one of the plurality of light receiving elements and the plurality of light receiving elements. A substrate including a decoder to scan the keycode value by analyzing the same, and an interface means for receiving the keycode value from the decoder and transferring the keycode value to an external device; And an upper cover in which a hole is formed so that each light receiving element can be inserted corresponding to the plurality of light receiving elements.

In addition, according to another aspect of the character input apparatus according to the present invention, the pointing pen includes a power supply unit for supplying power; A transparent cylindrical contact rod which is partially exposed to the outside of the pointing pen and can be inserted into the pointing pen; A transparent cylindrical lens in contact with the cylindrical contact rod and the light emitting element; A buffer band in contact with the light emitting element and the tact switch; A tact switch connected to the power source and the light emitting device to turn on the light emitting device by being turned on by a force inserted into the pointing pen by the transparent cylindrical contact rod; And a connection line connecting the power supply unit and the light emitting element, wherein the keypad unit is configured to scan a keycode value when any one of the plurality of light receiving elements and the plurality of light receiving elements is turned on, and interprets a key code value; A substrate including interface means for receiving a keycode value from the decoder and transferring the keycode value to an external device; And an upper cover in which a hole is formed so that each light receiving element can be inserted corresponding to the plurality of light receiving elements.

Hereinafter, with reference to the embodiments of the accompanying drawings will be described in detail the configuration and operation of the present invention.

1 is a perspective view of a mobile communication terminal employing a character input device according to the present invention. In Fig. 1, other parts except for the character keypad 1 and the pointing pen 2 are the same as those of the conventional mobile communication terminal.

As shown in FIG. 1, the character input device according to the present invention includes a character keypad portion 1 having the same arrangement as that of a standard keyboard layout used for a computer or the like under the number and function keypad portion 4 of the mobile communication terminal. It comprises a pointing pen 2 which contacts each key input part of the said character keypad part 1, and inputs a character.

The character keypad portion 1 has a light receiving element at each key input portion, and the pointing pen 2 has a light emitting element. In addition, the pointing pen 2 is connected to the terminal by the connecting line 3 to prevent loss.

The operation of the character input device according to the present invention having such a configuration will be described generally below. That is, the pointing pen 2 includes a switch and a light emitting element operated by contact, and a light receiving element is provided inside each key of the character keypad 1 so that when the character is input, When the end is contacted with the key input part of the character keypad part 1 and pressure is applied, infrared rays are radiated from the light emitting element while the switch is operated, and the emitted infrared rays are transmitted to the light receiving element of the character keypad part 1 while the light receiving element is operated. To print the key code value.

Hereinafter, the configuration of the character keypad 1 and the pointing pen 2 which are the key features of the character input apparatus according to the present invention will be described in detail.

2 is an exploded perspective view showing an enlarged portion of the character keypad 1 according to the present invention, and FIG. 3 is a cross-sectional view of the character keypad 1 according to the present invention.

As shown in Figs. 2 and 3, the character keypad 1 includes a printed circuit board 5, a plurality of infrared light receiving elements 6 arranged in a matrix shape inside the printed circuit board 5, The upper lid 7 is provided with a hole 8 into which each of the light receiving elements 6 can be inserted, corresponding to each of the plurality of light receiving elements 6.

The upper cover 7 is a double structure composed of an upper plate 71 of a transparent material and a lower plate 72 of an opaque material. The dual structure is formed in such a way that, for example, white letters can be printed inside the upper plate 71 of the transparent material so as to identify each key input unit. Here, the lower plate 72 of the opaque material in the configuration of the upper cover 7 is preferably made of an acrylic plate of a color that can block ultraviolet rays.

In addition, it is preferable to form a concave downward curved portion 9 in each of the key input portions corresponding to each light receiving element 6 on the upper plate 71 of the upper lid 7. This is to prevent the malfunction by pointing the pen 2 to be accurately guided to the center when it touches each key input unit of the character keypad 1.

The assembly of the character keypad 1 of this structure is made as follows. First, a plurality of infrared light receiving elements 6 are arranged in a matrix shape on the printed circuit board 5 in the same manner as the standard keyboard keyboard arrangement, and molding between the respective light receiving elements 6 is molded. Next, the character keypad portion 1 is completed by covering the lower plate 72 and the upper plate 71 in order so that the respective holes 8 correspond to the respective light receiving elements 6.

FIG. 4 is a front view of the character keypad 1 according to the present invention, and shows an example of an arrangement of key input units used in a standard keyboard.

In the example of FIG. 4, the diameter of each keyboard is about 3 mm, the overall width of the keypad portion is about 36 mm (3 x 12), and the vertical height is about 18 mm (3 x 6). The thickness of the keypad part is about 1 mm for the upper cover and about 2 mm for the lower printed circuit board, and the total thickness is 3 mm or less. Therefore, each light receiving element is preferably at most 1.5 mm or less.

5 is a cross-sectional view showing an embodiment of the pointing pen 2 according to the present invention.

The pointing pen 2 includes a battery 10 for supplying power, an infrared light emitting element 11, a switch 12 connected to the battery 10 and the light emitting element 11, and an outside of the pointing pen 2. A portion of the furnace end is exposed and is formed to surround the outer cylindrical surface of the transparent cylindrical contact rod 14 which can be inserted into the pointing pen 2 and the contact rod 14, while interlocking with the pointing pen 2, When the contact rod 14 is inserted into the pointing pen 2, the inner cylindrical insert 15 is inserted into the inside and the end portion thereof contacts the switch 12 to operate the light emitting element 11, and the cylindrical The spring stopper 16 is formed to protrude outwardly in a longitudinal position of the cover 15 and surrounds the outer circumference of the cylindrical cover 13 at a position between the spring stopper 16 and the switch 12. It is composed of a spring 13 installed in the form.

In addition, the end of the pointing pen 2 is provided with a connecting line 3 connected to the main body of the terminal device to prevent loss.

As shown in FIG. 5, the switch 12 is connected to the battery 10 and the light emitting element 11, respectively, and a part thereof is short-circuited, and the cylindrical cover 15 has a pointing pen 2. As the retracted inside, the termination portion is in contact with the short-circuit portion of the switch 12 to operate the light emitting element 11. The conductive cylindrical cover 15 is made of a material such as copper, for example.

The cylindrical contact rod 14 is made of a transparent material to transmit the light from the light emitting element 11 to the light receiving element 6 through the curved portion 9 of the character keypad portion 1, the downward curved portion is formed It is preferable to have a convex end portion so as to be able to accurately contact the curved portion 9 of the upper plate 71 of the character keypad portion 1.

The spring 13 is supported by a spring stopper 16 such that the cylindrical contact rod 14 is compressed when the cylindrical contact rod 14 is inserted into the pointing pen 2 and the contact rod 14 at the key input of the keypad portion 1. When dropped, the cylindrical contact rod 14 is returned to its original position by elasticity.

On the other hand, the body of the pointing pen 2 uses an infrared ray blocking material to shield the reflected light from the light emitting element 11 and the cylindrical contact rod 14, and although not shown in the figure, the upper and lower portions are configured separately and separated. It is preferable to adopt a structure that can be combined with and to replace the internal parts such as the battery 10 or the contact rods 14.

The pointing pen 2 of this configuration operates as follows. First, if any key input unit arranged on the character keypad 1 for character input is pressed with the transparent cylindrical contact rod 14 of the pointing pen 2, the contact rod 14 and the cylindrical cover 15 interlocked with it. Is inserted into the pointing pen 2 together, and the end of the cylindrical cover 15 comes into contact with the switch 12. Next, the power is connected by the contact, and the light emitting element 11 is operated to emit light, and the emitted light is received by the corresponding key input unit of the keypad 1 through the transparent cylindrical contact rod 14. 6) is delivered. After the operation for inputting a desired character, the cylindrical contact rod 14 and the pointing pen 2 return to their original positions by the elasticity of the spring 13 which was suppressed by removing the pointing pen 2 from the keypad 1. do.

6 shows a cross-sectional view of another embodiment of the pointing pen 2 according to the invention.

The pointing pen 2 of FIG. 6 has the same basic principle as the embodiment of FIG. 5, but is characterized by a point using a tact switch 19 and a point using a buffer 18.

The pointing pen 2 of FIG. 6 includes a thin battery 20 for supplying power, a light emitting element 11, and a portion of a terminal exposed to the outside of the pointing pen 2, and can be inserted into the pointing pen 2. A transparent cylindrical contact rod 17, a transparent cylindrical lens 24 connected to the cylindrical contact rod 17 and the light emitting element 11, and a buffer connected to the light emitting element 11 and the tact switch 19. A tact switch 19 connected to the base 18 and the battery 20 and the light emitting element 11 and turned on by a force of inserting the transparent cylindrical contact rod 17 into the pointing pen 2; It is composed of a connecting line 21 connecting the battery 20 and the light emitting element (11).

The transparent cylindrical contact rod 17 is substantially the same structure as the contact rod 14 of FIG. 5, but is connected in direct contact with the cylindrical lens 24, and there is no difference in that there is no stopper 16 and a spring 13. have.

The transparent cylindrical lens 24 is inserted together when the contact rod 17 is inserted to transmit a force to the tact switch 19 through the light emitting element 11 and the buffer 18, the light emitting element ( 11) is responsible for transmitting the light emitted from the contact rod (17).

The buffer 18 is a means for preventing damage that may occur when the contact rod 17 is pressed hard, preferably made of a rubber or the like.

The tact switch 19 is a switch used for a mouse or the like as a switch that is operated by eliminating an internal short circuit by the addition of a force and then turned off when the addition of the force is released. The use of such a small tact switch 19 eliminates the need for a spring 13 as in FIG. 5, thus simplifying the construction of the pointing pen 2. The tact switch 19 is connected to the light emitting element 11 and the thin battery 20, respectively, and is operated by a force generated when the transparent cylindrical contact rod 17 presses the keypad 1. ) And the thin battery 20 are connected.

Referring to the operation of another embodiment of the present invention having the above configuration is as follows. That is, the cylindrical contact rod 17, the transparent cylindrical lens 24, the light emitting element 11, and the buffer 18 are connected to each other so as to move back and forth together, so that the contact rod 17 is connected to the character keypad portion 2; When pressed to the key input of the retreat together to press the tact switch 19, when the force is transmitted to the tact switch 19, the switch is turned on, the power is transferred from the battery 20 to the light emitting element 11, the light emitting element 11 Infrared rays are emitted. The emitted infrared rays are transmitted to the light receiving element 6 of the corresponding key input portion of the keypad 2 pressed through the transparent cylindrical lens 24 and the cylindrical contact rod 17. Subsequent operations are the same as described in the embodiment of FIG.

On the other hand, the pointing pen 2 of FIG. 6 is provided with a lower separating means 23 at the lower end of the pointing pen 2 so that the battery can be replaced, and at the upper end thereof, the contact rod 17, the cylindrical lens 24, The upper separating means 22 is provided to replace parts such as the light emitting element 11. The lower separating means 23 or the upper separating means 22 is preferably a screwing means consisting of a female screw and a male thread or a fitting means consisting of a recess and a protrusion.

8 shows a cross-sectional view and a cross-sectional view of a part of another embodiment of the pointing pen 2 according to the invention.

The pointing pen 2 of FIG. 8 has the same basic principle as the embodiment of FIG. 6, but does not include a small battery therein and is started by an external power source.

As shown in the figure, the pointing pen 2 in this embodiment includes a main body, a fixed electrode part 30, a moving electrode part 40, and a lens part 50 constituting the inside of the main body. .

The lens unit 50 is composed of a transparent cylindrical lens 24 and a contact rod 17, as in the embodiment of FIG. As one end of the transparent cylindrical lens 24, a light emitting element insertion groove 55 is formed at an opposite position of the contact rod 17 to form an inward groove.

The movable electrode portion 40 includes a cylindrical negative electrode 42 made of a conductive material, a movable electrode insulation portion 44 surrounding the outer circumference of the cylindrical negative electrode 42, and an outer circumference of the movable electrode insulation portion 44. The surrounding cylindrical positive electrode 46 and the light emitting element 11 are integrally coupled to each other through a penetrating structure. Two wires are embedded in the moving electrode insulation unit 44, one end of which is connected to the light emitting element 11, and the other end of which is connected to the cylindrical negative electrode 42. One line is connected to the cylindrical positive electrode 46.

The fixed electrode part 30 is composed of a fixed insulating part 32, a spring electrode 34 and a fixed cylindrical electrode 36. The fixed insulating part 32 is a cylindrical shape in which one side is closed and the other side is opened. The lower end of the cylindrical portion 33, which is the closed side, is made of a conductive material, but the cylindrical side end is made of a fixed insulating portion 32 of an insulating material. In addition, a wire is connected to the lower end of the cylinder 33 and extends to the outside of the pointing pen 2. In addition, a spring electrode 34 is seated inside the fixed insulation portion 32 inside the lower end portion 33 of the cylinder, and a fixed cylindrical electrode 36 is positioned on the outer circumference of the fixed insulation portion 32. do. The fixed cylindrical electrode 36 is composed of a conductor, and a wire is connected to one end thereof and extends to the outside of the pointing pen 2.

The lens unit 50, the moving electrode unit 40, and the fixed electrode unit 30 having the configuration as described above are positioned in the same order as above in the pointing pen 2, The members are spaced at regular intervals.

Also in the embodiment of FIG. 8, the upper and lower stage separating means as in FIG. 6 may be provided.

The operation of another embodiment of the present invention having the configuration as described above will be described.

The lens unit 50 and the moving electrode unit 40 are spaced apart from each other by a predetermined distance, but are configured to be movable back and forth, so that the contact rod 17 of the pointing pen 2 is input for character input. When pressed against the key input portion of the keypad portion 2, the light emitting element 11 of the movable electrode portion 40 retreats along with the transparent cylindrical lens 24 and the light emitting element insertion groove 55 below the lens portion 50. The force is applied downwards as it is inserted into the.

By the addition of the downward force, the entire moving electrode part 40 moves together and comes into contact with the fixed electrode part 30. At this time, the cylindrical negative electrode 42 of the movable electrode portion 40 is electrically connected to the lower end portion 33 of the cylinder through the spring electrode 34 of the fixed electrode portion 30, the cylindrical of the movable electrode portion 40 The positive electrode 46 is electrically connected to the fixed cylindrical electrode 36 on the outer circumference of the fixed electrode unit 30.

Therefore, the power source from the outside is connected to the light emitting element 11 through the anode side of the external power source, the fixed cylindrical electrode 36, and the cylindrical positive electrode 46 on the side of the anode, and the cathode side and the cylinder of the external power source on the side of the cathode. Since the lower end 33, the spring electrode 34, and the cylindrical negative electrode 42 are connected to the light emitting element 11, the light emitting element 11 emits light according to the application of power. The light emitted as described above reaches the light receiving element 6 of the character keypad 1 through the transparent cylindrical lens 24 and the contact rod 17.

When the pointing pen 2 is spaced apart from the character keypad 1 in order to end an operation for inputting a character, the fixed electrode part 30 is caused by the elasticity of the spring electrode 34 mounted on the fixed electrode part 30. The moving electrode portion 40 and the lens portion 50 are spaced apart from each other, thereby shorting the electrical connection.

7 illustrates a circuit configuration connected to a light receiving element inside a printed circuit board of a character keypad portion. As shown in FIG. 7, each of the light receiving elements is arranged in a matrix form, and when any key input portion of the character keypad is pressed with a pointing pen, the light emitting element inside the pointing pen is turned on, and thus the corresponding light receiving element is turned on. The signal of the turned on light receiving element is scanned and interpreted by the decoder 91 so that the key code value is transmitted to the keyboard interface unit 92.

The key code value transmitted to the keyboard interface unit 92 is, for example, a mobile communication terminal device, which is transmitted to the terminal device control unit to be displayed on the display device. It will be delivered to the receiving device at the remote location.

As described above with reference to the preferred embodiment of the present invention, it will be apparent to those skilled in the art that various modifications and applications are possible in the embodiment.

For example, the character input device according to the present invention can be used for any small terminal device that requires a character input keyboard such as a remote controller or a PDA terminal used in a set top box.

According to the present invention, the light-emitting element and the light-receiving element are separately provided in the pointing pen and the keypad to form the character input device, thereby providing an ultra-thin and ultra-small character input device with a simple configuration.

That is, according to the present invention, the light emitting element of the pointing pen operates when the light emitting element and the light receiving element are separately installed on the pointing pen and the keypad, and the pointing pen is brought into contact with the key input formed on the keypad. The radiation is transmitted to the light receiving element of the keypad unit so that characters can be input, thereby providing an ultra-thin and ultra-small character input device.

In addition, according to the present invention, since the contactless method using the light-emitting and light-receiving elements when inputting the character key is superior in durability than the conventional apparatus of the contact switch type.

In addition, according to the present invention, by forming a concave curved portion that can contact the pointing pen in the keypad portion, it is possible to prevent a typo, the light receiving element of the keypad is driven with a very small current and the light emitting element is only in contact with the pointing pen Since it is turned on, the current consumption is extremely low and economical.

In addition, by using the character input device according to the present invention by using a mobile communication terminal such as a cellular phone, a PDA, a TV remote control, and the like, it is possible to provide various terminal devices that can easily and easily input characters.

Claims (11)

A pointing pen including a light emitting element; And A keypad unit in which a plurality of light receiving elements are arranged in a matrix form Character input device comprising a. The method of claim 1, And the pointing pen comprises a switch means for turning on / off a light emitting element. The method of claim 2, And the switch means is turned on when the pointing pen is brought into contact with each key input of the keypad and pressed and turned off when it is separated from the key input. The method of claim 3, And said switch means is a tact switch. The method of claim 1, The pointing pen, A power supply unit supplying power; A switch connected to the power supply unit and the light emitting element; A transparent cylindrical contact rod which is partially exposed to the outside of the pointing pen and can be inserted into the pointing pen; A conductive cylindrical cover surrounding the outside of the contact rod and interlocked with the pointing pen so that the contact rod is inserted together when the contact rod is inserted into the pointing pen, the end of which is in contact with the switch to turn on the light emitting element; A spring stopper formed to protrude outwardly in a longitudinal position of the cylindrical cover to support the spring; And A spring installed to surround the outer circumference of the cylindrical cover at a position between the spring stopper and the switch Including; The keypad unit, A decoder unit for scanning a key code value by scanning the plurality of light receiving elements and any one of the plurality of light receiving elements when they are turned on; and an interface means for receiving a key code value from the decoder and transmitting the received key code value to an external device. A substrate comprising a; And An upper cover having a hole formed therein so as to allow insertion of each light receiving element in correspondence with the plurality of light receiving elements; Character input device comprising a. The method of claim 1, The pointing pen, A power supply unit supplying power; A transparent cylindrical contact rod which is partially exposed to the outside of the pointing pen and can be inserted into the pointing pen; A transparent cylindrical lens in contact with the cylindrical contact rod and the light emitting element; A buffer band in contact with the light emitting element and the tact switch; A tact switch connected to the power source and the light emitting device to turn on the light emitting device by being turned on by a force inserted into the pointing pen by the transparent cylindrical contact rod; And A connection line connecting the power supply unit and the light emitting element Including; The keypad unit, A decoder unit for scanning a key code value by scanning the plurality of light receiving elements and any one of the plurality of light receiving elements when they are turned on; and an interface means for receiving a key code value from the decoder and transmitting the received key code value to an external device. A substrate comprising a; And An upper cover having a hole formed therein so as to allow insertion of each light receiving element in correspondence with the plurality of light receiving elements; Character input device comprising a. The method of claim 1, The pointing pen includes a fixed electrode part, a moving electrode part, and a lens part, The lens unit is composed of a transparent cylindrical lens and a contact rod provided with a light emitting element insertion groove, The movable electrode unit is integrally combined with a cylindrical negative electrode made of a conductive material, a movable electrode insulating unit surrounding the outer circumference of the cylindrical negative electrode, a cylindrical positive electrode surrounding the outer circumference of the moving electrode insulating unit, and a light emitting element inserted therethrough. Two wires are embedded in the movable electrode insulation portion, one end of which is connected to both of the light emitting elements, and the other end of which is connected to the cylindrical negative electrode and the other of the wires to the cylindrical positive electrode. The fixed electrode part includes a fixed insulating part, a spring electrode and a fixed cylindrical electrode, wherein the fixed insulating part has a cylindrical shape in which one side is closed and the other side is opened, and a cylindrical lower end of a conductive material is formed on the closed side, and An electric wire is connected to extend to the outside of the pointing pen, and a spring electrode is seated inside the fixed insulating portion inside the lower end of the cylinder, and a fixed cylindrical electrode is positioned on the outer circumference of the fixed insulating portion. The electrode is composed of a conductor, one end of the wire is connected to extend to the outside of the pointing pen, In a normal situation, the lens unit, the moving electrode unit, and the fixed electrode unit are spaced apart from each other with a predetermined gap. The keypad unit, A decoder unit for scanning a plurality of light receiving elements and any one of the plurality of light receiving elements when they are turned on, and interpreting a key code value, and interface means for receiving a key code value from the decoder and transferring the received key code value to an external device; A substrate comprising a; And An upper cover having a hole formed therein so as to allow insertion of each light receiving element in correspondence with the plurality of light receiving elements; Character input device comprising a. The method according to any one of claims 5 to 7, And an end of the transparent cylindrical contact portion protrudes convexly toward the outside, and the upper cover includes a curved portion which is concave downward. The method according to any one of claims 5 to 7, The upper cover is a character input device, characterized in that consisting of the upper plate of the transparent material and the lower plate of the opaque material. The method of claim 9, Character input device, characterized in that the cannibal character is printed on the back of the upper plate of the transparent material. The method according to any one of claims 5 to 7, The pointing pen is a character input device, characterized in that provided with a separation means for separating the pointing pen.