CN113760109A - Active stylus - Google Patents

Abstract

The invention provides an active stylus. The tapping sound when the active stylus is in contact with the input surface is reduced, the input to the digitizer can be performed comfortably, and the abrasion of the input tip itself is reduced. An active stylus having a pointed tip, the tip being coated with a coating member made of a material different from that of the tip, particularly a coating member made of a fiber material impregnated with a binder containing particles.

Description

Active stylus

Technical Field

The present invention relates to an active stylus for use as an input means for a digitizer.

Background

In recent years, pointing devices such as a digitizer that performs input by physical contact on a screen have been widely used. That is, the position pointer formed in a pen shape is brought into contact with the input surface of the plate-like input device provided with the position detection device to detect the contact position.

As a position indicator used for such a digitizer, there is a position indicator such as a so-called active stylus disclosed in patent document 1 below. Since a metal member capable of generating static electricity in an amount detectable by the position detection device is attached near the input tip of the active stylus pen, the input tip can be made as sharp as a common writing instrument such as a ball-point pen or a mechanical pencil.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-142318

Disclosure of Invention

Problems to be solved by the invention

When the active stylus is used to input an input to the digitizer, when the tip of the active stylus is brought into contact with an input surface (typically using tempered glass) of the digitizer, a tapping sound may be generated at the tip to tap the input surface. The tapping sound sometimes gives an uncomfortable feeling to the user or the surrounding people.

In view of the above problems, an object of the embodiments of the present disclosure is to reduce a click sound when an active stylus is in contact with an input surface and to comfortably input to a digitizer. In addition, the wear of the input tip itself is reduced.

Means for solving the problems

An active stylus according to claim 1 of the present disclosure has a pointed input tip, and the input tip is covered with a covering member made of a material different from that of the input tip. Here, the thin front end of the active stylus means that the front end of the active stylus has a smaller diameter than the barrel, and has the smallest diameter in the entire active stylus.

Solution 2 of the present disclosure, in addition to having the features of solution 1, the sheathing member is formed of a fiber raw material. The fiber material includes, for example, cloth and nonwoven fabric.

Claim 3 of the present disclosure is characterized in that, in addition to the features of claim 2, the fiber raw material is impregnated with a synthetic resin as a binder. The binder is a synthetic resin impregnated into a fiber raw material for the purpose of reinforcing the fiber raw material and imparting shaping properties and smoothness. The resin used for the binder is not particularly limited as long as it has physical properties that enable impregnation into the fiber material, and a polyethylene resin or a polypropylene resin can be used, but a resin having excellent wear resistance, such as a polyimide resin or a polytetrafluoroethylene resin, is preferably used.

In addition to the features of embodiment 3, claim 4 of the present disclosure includes particles in the binder. The particles are added to aid in the properties of the binder. For example, in the case where the binder is a relatively soft resin such as a polyethylene resin or a polypropylene resin, it is desirable to contain, for example, carbon particles or ceramic particles to impart wear resistance and sliding resistance to the cladding member. In addition, when a resin excellent in wear resistance and sliding resistance, such as a polyimide resin or a polytetrafluoroethylene resin, is used as the binder, for example, rubber particles may be added to impart a soft touch to the covering member.

ADVANTAGEOUS EFFECTS OF INVENTION

The embodiments of the present disclosure are configured as described above, and therefore, it is possible to reduce the click sound when the active stylus is in contact with the input surface, and to comfortably input to the digitizer. In addition, the wear of the input tip itself can be reduced.

Drawings

Fig. 1 is a front view of an active stylus of an embodiment.

FIG. 2 is a front view of an active stylus prior to installation of a cladding member.

Fig. 3 is a front perspective view of the input tip.

Fig. 4 is a front cross-sectional view of the input front end of fig. 3.

Fig. 5 is a sectional view showing a front end portion of the barrel.

Fig. 6 is a cross-sectional view illustrating a front end portion of the active stylus of fig. 2.

Fig. 7 is a perspective view of an installation tool for installing cladding members to the active stylus of fig. 2.

Fig. 8 is a group diagram showing an exploded state of the mounting tool of fig. 7.

Fig. 9 is a perspective view showing a state in which a covering member is mounted on the mounting tool of fig. 7.

Fig. 10 is a cross-sectional view showing an example of a method of attaching the cover member to the active stylus.

Fig. 11 is a cross-sectional view showing an example of a method of attaching the sheathing member to the active stylus.

Fig. 12 is a cross-sectional view illustrating a front end portion of the active stylus of fig. 1.

Fig. 13 is a graph showing a frequency spectrum of a click sound generated in association with an input to the digitizer of the active stylus according to the present embodiment.

Description of the reference numerals

10. An active stylus; 20. a pen holder; 21. a tapered portion; 22. a recessed portion; 23. a signal transmission unit; 24. a connecting protrusion; 25. an external thread; 30. inputting a front end; 31. a contact portion; 32. a connecting portion; 33. an electric field generating section; 34. a connection space; 35. an internal thread; 40. a covering member; 50. installing a tool; 51. a cover portion; 51A, a fixing hole; 52. an insertion portion; 52A, an insertion port; 53. positioning a plate; 53A, a positioning window; 53B, through holes; 55. a placement part; 56. a carrying surface; 56A, a fixed protrusion; 57. and inserting the groove.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the side of the active stylus 10 that is in contact with the input screen of the digitizer during use will be referred to as the "front end", and the opposite side will be referred to as the "rear end".

As shown in the front view of fig. 1, the active stylus 10 according to the present embodiment is formed in a pen shape with a tapered tip. That is, the tip of the substantially cylindrical barrel 20 is a tapered portion 21 having a narrow tip, and a substantially conical input tip 30 having a rounded tip is attached to the tip of the tapered portion 21. The surface of the input leading end 30 is covered with the covering member 40. Various electronic components not shown for realizing the function of the active stylus 10, and their wiring, etc. are housed in the barrel 20, but the description thereof is omitted in the present disclosure.

Fig. 2 illustrates, in front view, the active stylus 10 of fig. 1 prior to installation of the cladding member 40. The input tip 30 having a substantially conical shape with rounded corners at the tip is attached to the tip of the tapered portion 21, which is the tip of the barrel 20, in a state where the material is exposed to the surface.

Fig. 3 is a front perspective view of the input tip 30. The input front end 30 is integrally molded with a contact portion 31 having a substantially conical shape and on the front end side contacting the input screen of the digitizer, and a connection portion 32 having a substantially cylindrical shape on the rear end side, using a synthetic resin such as polyacetal.

Fig. 4 shows the input tip 30 of fig. 3 in a front sectional view. The contact portion 31 has a tapered shape with a narrow tip. An electric field generating portion 33 made of stainless steel is insert-molded together with the contact portion 31 in the tip of the contact portion 31. Further, a connection space 34 from the rear end to the electric field generating portion 33 is provided inside the input tip 30. An internal thread 35 is cut in the inner peripheral surface of the rear end portion of the connecting space 34.

Fig. 5 shows a front end portion of the cartridge 20 in a sectional view. In addition, the internal construction of the barrel 20 is omitted. A recess 22 is formed at the front end of the tapered portion 21 of the barrel 20. A substantially cylindrical coupling protrusion 24 is formed from the bottom surface of the recess 22 toward the distal end, and a male screw 25 is cut on the outer peripheral surface of the coupling protrusion 24. A rod-shaped signal transmission section 23 is provided to protrude from the tip of the connection projection 24.

Fig. 6 is a cross-sectional view showing a state where the input tip 30 is inserted into the tip of the barrel 20. When the signal transmission part 23 is inserted into the connection space 34 and the male screw 25 (see fig. 5) of the connection protrusion 24 and the female screw 35 (see fig. 4) of the connection space 34 are screwed to each other, the signal transmission part 23 is brought into contact with the electric field generating part 33 while the connection part 32 is inserted into the recess 22. In this state, the active stylus 10 shown in fig. 2 is obtained.

Fig. 7 is a perspective view of an installation tool 50 for installing the cladding member 40 on the surface of the input tip 30 of the active stylus 10 shown in fig. 2. An insertion portion 52 having an insertion opening 52A formed at the center thereof protrudes from the top surface of the lid portion 51 of the attachment tool 50. Two fixing holes 51A for fixing a positioning plate 53 (see fig. 8) described later are provided on the top surface of the lid 51 via the insertion portion 52. In addition, only the lid portion 51 is visible when the mounting tool 50 is viewed in a plan view, and the placement portion 55 (see fig. 9) covered by the lid portion 51 is not visible in this state.

Fig. 8 is a block diagram of the installation tool 50 of fig. 7. In fig. 7, a rectangular placement surface 56, which is the top surface of the placement portion 55 covered with the cover 51, has a fixing projection 56A projecting from a position corresponding to the fixing hole 51A of the cover 51. The mounting surface 56 is divided into two by an insertion groove 57 which is a groove having a V-shaped cross section and is provided at a position where the long side is divided into two. The width of the insertion groove 57 gradually decreases toward the bottom surface side. The inclination of the groove surface of the insertion groove 57 is substantially equal to the inclination of the tapered shape of the contact portion 31 of the input tip 30. A positioning plate 53 is placed on the placement surface 56, and a positioning window 53A having a rectangular opening is formed in the center of the positioning plate 53. The positioning plate 53 has a through hole 53B formed at a position corresponding to the fixing projection 56A.

As shown in fig. 8, the covering member 40 has a planar shape in which two fan-shaped portions are connected at respective apex portions. The covering member 40 is formed of a material different from that of the input tip 30, and specifically, the covering member 40 is formed by impregnating a nonwoven fabric fiber material as a base material, with a binder, the nonwoven fabric fiber material including natural fibers such as wool or cotton, chemical fibers such as polypropylene or polyester, or inorganic fibers such as glass fibers or carbon fibers, the binder including liquid polyurethane, epoxy resin, polyimide, polyamide, silicone, or the like, and being cured on polymer particles, inorganic particles, or synthetic resins having surfaces thereof plated or coated, the polymer particles being wear resistant or highly heat resistant. Further, a rubber-based, acrylic-based, or silicone-based adhesive is applied to one surface of the covering member 40, whereby the covering member 40 is joined to the input tip 30.

Fig. 9 is a perspective view showing a state where the covering member 40 is placed on the placement surface 56. The positioning plate 53 is placed on the placement surface 56 such that the fixing projection 56A passes through the through hole 53B. In this state, the covering member 40 is placed in the vicinity of the center of the positioning window in the center of the positioning plate 53 so as to straddle the insertion groove 57. At this time, the adhesive faces upward. When the cap 51 is attached to the mounting portion 55 from this state so that the fixing projection 56A passes through the fixing hole 51A, the attachment tool 50 is brought into the state shown in fig. 7 and is ready for use.

Next, a method of attaching the sheathing member 40 to the active stylus 10 is shown in cross-sectional views of fig. 10 and 11. However, the internal structure of the active stylus 10 is omitted. The sheathing member 40 is attached to the inside of the installation tool 50 as described above. In this state, as shown in fig. 10, the tip of the active stylus 10 is inserted into the insertion port 52A of the insertion portion 52, and the tip of the input tip 30 is brought into contact with the adhesive surface of the covering member 40. When the active stylus 10 is further pressed from here, the input tip 30 is fitted into the insertion groove 57 as shown in fig. 11 while pressing the covering member 40 downward toward the bottom surface. In this state, the covering member 40 is pressed against the surface of the input tip 30 by the insertion groove 57, and the covering member 40 is adhered with the adhesive in a state in which it is not wrinkled and is not loosened such that the two fan-shaped portions cover half of the side surfaces of the contact portion 31, respectively. Then, when the active stylus 10 is pulled out of the insertion portion 52, the active stylus 10 becomes the active stylus 10 shown in fig. 1.

As shown in the cross-sectional view of fig. 12, the active stylus 10 has a layer of cladding member 40 formed on the surface of the input front end 30. In this way, since the covering member 40 made of a fiber material as a base material is attached to the input tip 30, a click sound generated by contact with an input screen of the digitizer can be reduced at the time of input, and input can be performed comfortably. Further, by reducing the wear of the input tip 30, the input tip 30 can be made longer in life. Further, when the covering member 40 is worn, a new covering member 40 can be mounted by using the mounting tool 50 again. Further, by releasing the screw engagement between the input tip 30 and the barrel 20, the input tip 30 itself can be replaced.

[ examples ] A method for producing a compound

The effect of reducing the click sound when the active stylus pen of this embodiment is input to the digitizer will be described with reference to examples. In the present embodiment, an input to the input screen of the digitizer is actually attempted using the active stylus shown in fig. 1.

That is, a covering member formed of a polyester fiber containing a binder including a polyurethane resin and a resin based on japanese industrial standard JIS K7367-3: 1999 the obtained ultra high molecular weight polyethylene particles having a viscosity average molecular weight of 100 ten thousand or more.

With the active stylus pen of the embodiment thus configured, an input operation is performed on the input surface made of tempered glass of the digitizer. The tap sound generated at the time of the input operation was supplied to a smartphone application "Sonic Tools SVM" (developer: Rikki Systems Inc.) for spectrum analysis. As a comparative example, a spectrum analysis was similarly performed for an active stylus not equipped with a coating member. The results are shown in the graph of fig. 13.

The broken line in the graph of fig. 13 represents the frequency spectrum of the comparative example, and the solid line represents the frequency spectrum of the example. As shown in the graph, in the case of the active stylus pen according to the embodiment, a decrease in sound pressure can be observed over the entire frequency band of the tapping sound, and particularly, a decrease of about 20 to 35dB can be observed for sound pressures in the unvoiced range of about 2kHz to about 5kHz shown by a dotted line in the figure. Therefore, it is found that the attachment of the covering member is effective for reducing the uncomfortable beating sound.

Industrial applicability

The present invention can be applied to a stylus pen used for input to a digitizer.

Claims (4)

1. An active stylus, wherein,

the active stylus has a tapered input front end, and the input front end is covered by a covering member made of a material different from the input front end.

2. The active stylus of claim 1,

the sheathing member is formed of a fiber raw material.

3. The active stylus of claim 2,

the fiber material is impregnated with a synthetic resin as a binder.

4. The active stylus of claim 3,

the binder contains particles.

Images