JP2003256121A - Signal detecting pin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the assembling workability for acquiring the insulating property of a tail plug and a cable guide while satisfying the slip-off preventing strength and locking strength of the cable guide. <P>SOLUTION: A ring having a plurality of projections on the inner circumference, and a plurality of cutouts in the axial direction, is inserted in the cable guide which is pressed into the tail plug. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an input pen of a coordinate tablet, and more particularly to an input pen for protecting a cable attached to a tail plug so as not to come off. The present invention relates to a signal detection pen equipped with a ring having a protrusion on the circumference. 2. Description of the Related Art Conventionally, as a method of fixing a cable guide made of a metal spiral tube over which a resin tube is covered, a resin tube is cut out from an end face of the spiral tube by an amount to be screwed into a tail plug. Is exposed and a screw is used to screw it into a metal tail plug using a small screw from the side. In this state, the tail plug and the helical tube serving as the cable guide are in an electrically conductive state. Some signal detection pens that detect coordinates on the tablet board require insulation between the tail plug and the cable guide to reduce the effects of noise. Therefore, even if the cable guide is fixed, an insulation film such as electrodeposition coating is applied to the entire tail plug including the internal screw part so that insulation can be obtained, and an adhesive is applied to the threaded part inside the tail plug, and the adhesive is also used. An insulating layer was also provided. For screwing the cable guide on the side to prevent rotation, a resin sheet is inserted into the screw hole, and an insulating layer of the resin sheet is provided between the tip of the small screw and the spiral tube, and screwed. [0003] However, in the above prior art, the insulating film formed by electrodeposition coating or the like is very thin, and the metal may be exposed at the thread edge portion inside the tail plug. Insulation was unstable. In addition, fixing with an adhesive that also serves as an insulating layer takes time for spreading and fixing the adhesive to the threads and valleys, and the workability is poor, and improvement in yield cannot be expected. SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and a plurality of protrusions are provided on the inner circumference of the cable guide outside the resin tube of the cable guide on the tail plug of the signal detection pen. There is a signal detection pen that inserts a retaining ring with multiple notches in the axial direction, presses it into the tapered tail plug, and fixes the cable guide. is there. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A retaining ring is inserted into a metal helical tube covered with a resin tube, which is a cable guide of a signal detection pen, and pressed into a tail plug. According to the present invention, since the retaining ring having a plurality of projections on the inner circumference and a plurality of notches in the axial direction bites the resin-coated spiral tube itself, the cable guide and It is insulated from the tail plug, and it is difficult for the cable guide to pull out due to the protrusion on the circumference when pulled.The edge of the notch in the axial direction cuts into the resin tube in the left and right rotation direction as a stopper. Has an action. The details of the present invention will be described with reference to the accompanying drawings.
Reference numeral 1 denotes a signal detection pen used in the coordinate detection device 2. In order to perform coordinate input, the tip of the signal detection pen 1 is brought into contact with the surface of the tablet 2 so that each electrode in the tablet 2 can be input. Line and coordinate detection axis 21 of signal detection pen 1
The conductor (not shown) is capacitively coupled, and the electric signal transmitted from each electrode wire in the tablet 2 is processed by the signal processing unit 3 so that the coordinates of the tip of the signal detection pen 1 on the tablet 2 board surface can be calculated. To detect. Next, the tail plug 3 of the signal detection pen 1 of the present invention.
The (rear end) structure will be described. FIG. 2 is a sectional view of a main part of the signal detection pen 1 of the present invention. Cable guide 19
The resin tube 5 is formed integrally with the outer periphery of the metal spiral tube 6 constituting the above. A signal cable 7 is inserted into the spiral tube 6 with a gap from the spiral tube 6. A metal retaining ring 4 is inserted into the outer periphery of the resin tube 5 and is press-fitted along a tapered portion 8 inside the tail plug 3. At a position after the retaining ring 4 is press-fitted, a rib 10 is formed on the circumference to prevent the retaining ring 4 from being pushed back and removed. A resin sheet 1 is provided on the bottom inside the retaining ring 4.
The end surface of the spiral tube 6 directly hits the retaining ring 4 to prevent electrical conduction. The retaining ring 4 has a plurality of protrusions 11 at the same interval as the pitch of the helical tube 6 on the inner surface side circumference, and the shape of the protrusions 11 is such that the direction in which the cable guide 19 is set inside the ring is
An inclination is provided so that it can be inserted smoothly, and conversely, when it is attempted to pull out from the retaining ring 4, the projection is shaped to be caught on the resin tube. Further, the retaining ring 4 has a plurality of notches formed in the ring axial direction side so that the outer diameter becomes smaller along the tapered portion 8 when the retaining ring 4 is press-fitted along the tapered portion 8 inside the tail plug. [0009] The cable guide 1 now out of the tail plug
When the puller 9 is pulled, a plurality of protrusions 11 on the inner circumference of the retaining ring 4 bite into the resin tube 5 formed on the outer periphery of the spiral tube 6 so that the cable guide 19 does not come off. Also, since the inside of the tail plug 3 is tapered with respect to the pulling direction, even if the tail plug 3 and the mounting ring have play in the axial direction, if the cable guide 19 is pulled, the ring will be in the resin tube of the cable guide 19. 5
The force acts in the direction of biting into the body, making it harder to slip out.
On the contrary, when a force is applied in the pushing direction, the retaining ring 4 hits the rib 10 on the circumference formed inside the tail plug so that it is not pushed further. When a force is applied in the direction in which the cable guide 19 is twisted, the edges 13 and 14 of the axial cutout portions formed in the retaining ring 4 do not bite into the resin tube 5. FIG. 4 shows another embodiment of the retaining ring 4.
If the notch position is shifted from the center of the axis and processed, the edge shape of the notched end surface becomes a sharp edge so that the gable guide is easily bitten when turned. The direction of the edge is such that the edge bites in either the left or right direction. FIG. 5 shows another embodiment of the retaining ring 4.
The base of the cutout portion is larger than the cutout width, and one cutout book is easily bent in the torsion direction of the cable guide 19. This makes it easier for the retaining ring to bite into the resin tube in the torsion direction of the cable guide 19.
FIG. 6 is a sectional view of a conventional main part. As can be seen from the above description, the present invention has a simple structure in which the retaining ring 4 is press-fitted and fixed to the inside of the tail plug 3 so that the cable guide 19 can be prevented from coming off and the rotation can be stopped. The insulation of the guide 19 is provided. In addition, although the mounting ring is press-fitted against slippage of the tail plug 3 and the mounting ring, there is sufficient anti-slip strength. May be applied. Although the tail plug 3 and the mounting ring have been described as being made of metal, they may be made of resin regardless of metal. In the case of resin, a vertical rib is formed on the axial side inside the tail plug, and a groove corresponding to the rib is formed. It is also possible to prevent the tail plug 3 and the retaining ring 4 from slipping in the rotational direction by forming the retaining ring 4 on the retaining ring 4 and matching the press-fitting. According to the signal detection pen of the present invention, the resin tube of the cable guide can be held by using the retaining ring, and insulation from the tail plug can be achieved. In addition, it can be fixed by a simple operation of simply press-fitting a cable guide in which a retaining ring is set inside the tail plug. While maintaining the insulation properties, the cable guide is expected to have a fixed strength against pulling out and twisting, and at the same time, the workability is improved and the yield is improved.

[Brief description of the drawings] FIG. 1 is a configuration diagram of a capacitively coupled coordinate detection device. FIG. 2 is a sectional view of a main part of the present invention. FIG. 3 is a longitudinal sectional view of the retaining ring of the present invention. FIG. 4 is a longitudinal sectional view of a retaining ring according to another embodiment. FIG. 5 is a longitudinal sectional view of a retaining ring according to another embodiment. FIG. 6 is a sectional view of a conventional main part. [Explanation of symbols] 1 signal detection pen 2 tablets (coordinates) 3 tail plug 4 retaining ring 5 Resin tube 6 spiral tube 7 Signal cable 8 Tapered part 9 Resin sheet 10 ribs 11 Projection 12 Incline 13 Edge 14 Edge 15 holes 16 Small screw 17 Resin sheet 18 Adhesive 19 Gable Guide 20 Pen rubber 21 Coordinate detection axis

Claims (1)

Claims: 1. A signal detecting pen for detecting coordinates on a tablet board surface, wherein a cable guide formed by a spiral tube having a resin tube covered on a tail plug of the signal detecting pen is fixed. As means, a plurality of protrusions are provided on the inner surface side circumference on the outer side of the resin tube, and a retaining ring provided with cutouts at a plurality of positions in the axial direction is inserted, and the ring is tapered. A signal detection pen, which is press-fitted along the inside of the stopper to fix a cable guide.