JP2007299234A - Nib holding structure for electronic pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce assembly operation time for an input pen in which the nib can be exchanged. <P>SOLUTION: A cylindrical bearing with a nib holder is provided with a plurality of slitting grooves so as to be elastic in the axis direction, and a rotation shaft which slides in the cylindrical inside is provided with a difference between projections of insertion beginning and end parts so as to be a taper convex shape. Thereby, insertion operations can be performed with a comparatively weak force without straining the slitting groove elastic part, and a part which engages to a ring recessed part to engage the sliding rotation shaft that is provided in the cylindrical inside of the slitting grooves can be made to be large, so that a drawing prevention effect can be achieved. Furthermore, when the sliding rotation shaft and the cylindrical bearing is engaged, the sliding rotation shaft covers the slitting groove peripheral part of the cylindrical bearing, so that the slitting grooves are expanded and the sliding rotation shaft cannot be drawn. In addition, a space is provided between the inside of the cylindrical bearing and the peripheral surface of the sliding rotation shaft that is to be inserted, so that the cylindrical bearing and the sliding rotation shaft can be rotated in the diameter direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pen tip holding structure for a signal detection input pen used in a tablet input device.

This will be described with reference to FIG. The signal detection input pen used in the tablet input device is an input pen used to detect an electrical signal by bringing the pen tip close to the tablet and display the coordinate position of the tablet on the display screen.
The pen tip 82 of the input pen 80 is rotated 89 in the radial direction in consideration of the deviation of the tip generated during writing and the ease of replacement of the pen tip 82, and the pen tip 82 protrudes from the inside of the pen body 81 and is stored. A structure that is movable in the direction 85 is required. The pen tip 82 has a columnar shape, and the bearing 83 that holds the pen tip 82 has a cylindrical shape, and is press-fitted and fixed to the cylindrical inner surface so as to be replaceable in the tip direction. The rear end of the bearing 83 that holds the pen tip 82 projects and slides on a rotating shaft 86 that is movable in the storage direction 85 and is screwed with a screw. Since the input pen 80 receives vibration and impact during writing, the screw is fixed with an adhesive so that the screw of the rotating shaft 86 sliding with the bearing 83 does not loosen.
The rotating shaft 86 that slides is pushed toward the pen tip 82 by the spring 88 through the guide 90 from the rear end so that the pen tip 82 pushed in the storing direction by the external pressure by writing returns. A structure in which a stable length protrudes from the main body 81 is adopted. The guide 90 is twisted and distorted when the spring 88 is rotated, and the pen tip 82 cannot be protruded by a stable amount, so that the spring 88 and the rotating shaft 86 are in direct contact with each other so that the spring 88 does not rotate. The structure is provided with a guide 90 formed of a material having good slidability for buffering.
Japanese Patent Application Laid-Open No. 09-109589. JP2003-168539A.

  However, in the structure of an input pen with a replaceable pen tip, the torque management by screwing to screw the bearing holding the pen tip and the sliding rotating shaft, the amount of adhesive by adhesive application, and the curing time There are problems that it is difficult to manage and there are parts that are twisted and not distorted by the rotation of the spring, and it takes time to assemble.

  The present invention has been made in view of the above problems, and is an electronic pen for detecting coordinates of a coordinate input device or a cylindrical type provided in the electronic pen in an electronic pen for inputting coordinate data to a coordinate input device. A pen tip holding structure of an electronic pen having a slide shaft to be inserted into the chuck portion, and a tip hole into which a replaceable pen tip can be inserted into the cylindrical chuck portion. A rear hole for inserting the slide shaft is provided, a plurality of slit grooves are provided on the outer periphery of the chuck portion in the direction in which the slide shaft is inserted, and an inner surface of the cylindrical chuck portion is provided toward the cylindrical axis. Protrusions and tapered recesses are provided, the slide shaft is provided with a taper convex portion, a terminal end portion of the taper convex portion has a rotation shaft portion, and the slide shaft is inserted into the chuck portion when the slide shaft is inserted. The taper concave portion provided on the slide shaft and the taper convex portion provided on the slide shaft are connected, and the protrusion provided in the chuck portion toward the cylindrical axis can be appropriately attached to the rotary shaft portion provided on the slide shaft. The present invention proposes a pen tip holding structure for an electronic pen in which a chuck portion and a slide shaft are rotatable.

  Since no adhesive is used to assemble the cylindrical bearing with the nib holder and the sliding rotating shaft, it can be assembled easily and a gap can be provided between the bearing and the sliding shaft, allowing rotation. Therefore, it is possible to reduce the number of parts for eliminating the twisting and distortion of the spring generated by the rotation.

  A plurality of slotted grooves and a sliding rotation shaft inserted into the inner surface of the cylindrical bearing to give elasticity in the axial direction to the cylindrical bearing provided with the pen tip holding portion have a tapered shape, and the later The sliding convex shaft provided on the inner surface of the slot groove provided in the cylindrical bearing allows the insertion work with a relatively weak force without giving large distortion to the slot groove by adopting a tapered convex shape that becomes thicker. Since the portion locked to the annular taper recess for fitting can be increased, an effect of preventing the removal can be obtained. Furthermore, when the rotating shaft that slides and the cylindrical bearing are fitted together, the rotating shaft that slides the outer periphery of the slit groove of the cylindrical bearing covers the outside so that the slit groove is intentionally expanded from the outside, and the sliding shaft slides. The structure cannot be removed. Further, by providing a clearance between the inner surface of the cylindrical bearing and the outer peripheral surface of the sliding rotating shaft to be inserted, the cylindrical bearing and the rotating rotating shaft are configured to be rotatable in the radial direction.

  Hereinafter, the details of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an input pen 1 for signal detection used in a tablet input device. When the pen tip 2 touches the tablet top 21 and the pen tip 2 is pressed, the input pen 1 starts to operate, and coordinates 21x, The metal shaft 2a (see FIG. 2) in the nib 2 senses the position of 21y as an electrical signal, the chuck 30 and the connected slide shaft 40 are transmitted to the spring 3, and the positions of the coordinates 21x and 21y on the tablet 21 described above are detected. The spring 3 connected to the pen substrate 4 as an electric signal is transmitted to a circuit (not shown) in the pen substrate 4 as an electric signal. An electrical signal processed by a circuit (not shown) is transmitted through the cables 6a and 6b, passes through the pen cable 5 covering each cable, and is connected to the tablet substrate 22 via the connector 23. The position of the pen tip 2 of the input pen 1 is displayed on the display screen (not shown) from the tablet substrate 22.

FIG. 2 is a cross-sectional view showing the configuration of each part of the input pen as an example of the present invention. The pen tip 2 of the input pen 1 detects a signal by integrally forming an input portion 2b of insulating resin (ABS, POM, PC, etc.) on a shaft 2a of conductive metal (aluminum, brass, iron, stainless steel, etc.) It is configured as possible. The nib 2 is held by a metallic chuck 30 and has a replaceable shape. The chuck 30 is connected to a slide shaft 40 formed of metal, and the slide shaft 40 is held by a holder 7 formed of insulating resin and is always pressed by the spring 3 in the tip direction on the pen tip 2 side.
The holder 7 holds the sensor 8 and the spring 3 and is provided with a groove 7 a for determining the position of the pen substrate 4, so that the positions of the holder 7 and the pen substrate 4 can be determined by inserting the pen substrate 4.

When the pen tip 2 is pushed with pressure by writing, the slide shaft 40 connected to the chuck 30 moves in the holder 7, and the rear end portion of the slide shaft 40 enters the sensor 8 and starts the operation of the input pen 1. When the pressure applied to the pen tip 2 is released, the slide shaft 40, the chuck 30, and the pen tip 2 are returned to their original positions by the spring 3. The spring 3 is formed of metal and joined to the pen substrate 4 with solder. The pen substrate 4 is provided with a circuit (not shown) for processing a plurality of electrical signals and a ground (not shown), and each signal and ground are controlled by the signal cables 6a and 6b and the ground cable 6c. A connector 23 is connected to the connector 22.
The attachment ring 9 has a shape in which the rear end portion of the inner cylinder 10 can be inserted without a gap, and the pen substrate 4 can be inserted into the groove 9a. The rear end side of the mounting ring 9 is formed by press-welding a pen cable 5 formed of a soft resin (PE, polyvinyl chloride, etc.) so that the signal cables 6 a and 6 b pass through the pen cable 5. The tail plug 11 has a shape into which the pen cable 5 and the attachment ring 9 can be inserted, and is screwed into the input pen 1.

FIG. 3 is a perspective view of the chuck and the slide shaft according to the present invention. A chuck 30 formed of metal in a cylindrical shape is provided with a tip hole 31 through which the pen tip 2 can be attached and detached at the tip, and a rear hole 32 for inserting the slide shaft 40 at the rear end. A plurality of slits 34 and a cylindrical inner surface 35 are provided in the cylindrical portion 33 from the rear end portion of the chuck 30 and a concave portion 37 having a shape 36 for fitting and locking the shape of the insertion portion 41 of the slide shaft 40.
The tip portion 42 of the insertion portion 41 of the slide shaft 40 is a taper convex with a gentle angle that is smaller than the diameter 35 of the inner surface of the chuck 30 to be inserted into the rear hole 32 and increases in diameter toward the rear end portion 43 of the insertion portion 41. It has a shape and an insertion portion 41 shape that fits and locks into the recess 34. When the slide shaft 40 is fitted into the chuck 30, the outer periphery of the cylindrical portion 33 of the chuck 30 is covered with the flange portion 44, and the holder portion 45 is provided with the flange portion 45 so that the slit 30 is not forcibly widened or deformed by an external force. The configuration was as follows.

  4 and 5 are sectional views showing the mounting method of the present invention. A method for attaching the slide shaft 40 to the chuck 30 will be described. By inserting the tip end portion 42 of the slide shaft 40 into the rear hole 32 (see FIG. 3) of the chuck 30 and pushing the insertion portion 41 in the direction of the tip hole 31, the slit groove 34 is expanded in diameter. When the slide rear end portion 43 is incorporated in the recess 37 and inserted into the locking portion 36 with a gap, the enlarged slot groove 34 is elastically restored to its original shape, and at the same time, the holder 45 of the slide shaft 40 is moved. The outer periphery of the cylindrical portion 33 is covered and connected by the flange portion 44. Since a gap 46 is provided between the incorporated concave portion 37 and the outer peripheral surface of the insertion portion 41 of the slide shaft 40, it is possible to rotate in the radial direction 48 around the rotation shaft portion 47 of the slide shaft 40.

  FIG. 6 shows a second embodiment. The slide shaft 40 can be connected with a light insertion force by reducing the slit wall thickness 50 provided in the chuck 30 and weakening the elasticity of expanding the diameter. The slide shaft 40 is inserted through a rear hole 51 provided in the chuck 30 and pushes the slit groove 52 wide. When the first protrusion 54 larger than the inner surface 53 of the chuck 30 is inserted toward the tip of the chuck 30, the rear hole 51 widens as shown in FIG. 7 and the second protrusion 55 larger than the first protrusion 54. Can be inserted easily. The slot 50 can be inserted with a light force by reducing the thickness 50 and separating the positions where the protrusions are provided.

Configuration diagram of tablet input device Cross-sectional view showing the configuration of each part of the input pen Perspective view of chuck and slide shaft First sectional view showing the mounting method Second sectional view showing the mounting method First sectional view of the second embodiment Second sectional view of the second embodiment Illustration of background art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input pen 2 Pen tip 3 Spring 4 Pen board 5 Pen cable 6a Signal cable 6b Signal cable 6c Ground cable 7 Holder 8 Sensor 9 Mounting ring 9a Groove 10 Inner cylinder 11 Tail plug 21 Tablet 21x coordinate 21y coordinate 22 Tablet board 23 Connector 24 Connector 25 Ground 30 Chuck 31 Lead hole 32 Rear hole 33 Cylindrical portion 34 Slot groove 35 Cylindrical inner surface 36 Shape that can be locked 37 Recess 40 Slide shaft 41 Insertion portion 42 Front end portion 43 Rear end portion 44 Grow 45 Holder 46 Gap 47 Rotating shaft 48 Radial direction at the center 50 Slot wall thickness 51 Rear hole 52 Slot groove 53 Inner surface 54 First projection 55 Second projection 80 Input pen 81 Pen body 82 Pen tip 83 Bearing 85 Projection, storage direction 86 Rotating shaft 88 Slide 89 Diameter 90 guides

Claims (1)

An electronic pen for detecting coordinates of a coordinate input device or an electronic pen for inputting coordinate data to a coordinate input device, comprising: a cylindrical chuck portion provided in the electronic pen; and a slide shaft inserted into the chuck portion. A pen tip holding structure for an electronic pen, wherein the cylindrical chuck portion is provided with a tip hole into which a replaceable pen tip can be inserted and a rear hole into which a slide shaft is inserted. A plurality of slit grooves are provided in the direction in which the slide shaft is inserted, and an inner surface of the cylindrical chuck portion is provided with a protrusion and a tapered recess provided toward the cylindrical axis, and the slide shaft is provided with a tapered protrusion. A taper recess provided on the inner surface of the chuck portion and a slide shaft provided when the slide shaft is inserted into the chuck portion. A super-convex part is connected, and a protrusion provided toward the cylindrical axis in the chuck part can be appropriately attached to the rotary shaft part provided on the slide shaft, and the chuck part and the slide shaft can be rotated. An electronic pen nib holding structure characterized by