CN116301411A - Pressure-sensitive graded sensing device, pressure-sensitive sensing method and electrostatic capacitive stylus - Google Patents
Pressure-sensitive graded sensing device, pressure-sensitive sensing method and electrostatic capacitive stylus Download PDFInfo
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- CN116301411A CN116301411A CN202310598359.2A CN202310598359A CN116301411A CN 116301411 A CN116301411 A CN 116301411A CN 202310598359 A CN202310598359 A CN 202310598359A CN 116301411 A CN116301411 A CN 116301411A
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- 230000008859 change Effects 0.000 claims abstract description 9
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- 241001422033 Thestylus Species 0.000 claims abstract description 8
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0441—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention provides a pressure-sensing graded sensing device, a pressure-sensing method and an electrostatic capacitive touch pen. The pressure-sensitive graded sensing device is used for sensing and outputting stress generated by the pen tip part based on the force applied by writing in the sliding process of the writing medium surface, namely pressure-sensitive output. The pressure-sensing grading induction device comprises a crankshaft, a first supporting part, an elastic limiting mechanism, a second supporting part, a first polar plate, a second polar plate, a capacitance measuring part and a nib pressure-sensing measuring part, and can realize the induction of nib stress load based on the polar plate distance change between the first polar plate and the second polar plate, so that the electrostatic capacitance type pressure-sensing grading induction output of the stylus with reliable structure and accurate measurement is realized. The pressure-sensitive grading induction device has simple and reliable structural design and high assembly precision, is not damaged by overload, and can improve the pressure-sensitive grading effect.
Description
Technical Field
The invention relates to the technical field of electrostatic capacitive touch pens, in particular to a pressure sensing technology of a pen point, and specifically relates to a pressure sensing grading sensing device, a pressure sensing method and an electrostatic capacitive touch pen.
Background
The touch pen is one of the input modes with the most matched capacitive screen and one of the input modes which is most fit with human writing logic. The touch pen product commonly used at present can not sense the pressing force of a user during writing and further output different handwriting if the pressure sensing grading function of the pen point part is not provided, and only the touch and basic writing effect can be achieved.
A few touch pen products with a pressure-sensitive grading function are based on the strain effect of a strain resistor body made of metal or semiconductor, the strain effect is realized by a stress transmission structure arranged in the pen body of the touch pen, the pressure-sensitive strain gauge is pressed to deform in the use process of the touch pen, the change of the resistance value of the pressure-sensitive strain gauge is detected, and then sampling and conversion are carried out through a high-resolution analog-digital converter (ADC), so that the handwriting with the grading of 4096 is output.
The stress transmission structure of the aforementioned resistive strain scheme is relatively complex in structural design, for example, the pressure sensing assembly and the stylus disclosed in the patent application publication No. CN114201063a are provided with a spring plate, a main shaft, a support and a strain sensor, the main shaft is rigidly connected with the pen point and passes through the support to be abutted to the abutting body position of the spring plate, the strain sensor is attached to the attaching body position of the spring plate, and the abutting body position is spaced from the attaching body position and is connected through an intermediate connector. Therefore, after the nib receives the pressure of the screen, the main shaft can move, so that the supporting body is pushed to move in the direction away from the attaching body, and the attaching body is relatively fixed with the support, the attaching body can deform at the moment, and the output signal of the strain sensor can change along with the different deformation of the attaching body, so that the writing pressure is detected.
It should be noted that in nib pressure-sensing designs employing resistive strain mode, one basic premise that piezoresistive strain gauges are used to make stress measurements is that: the presence of an elastomer (such as the attachment of the dome used in CN114201063 a) is also known as encapsulation of piezoresistive strain gauges on rigid structures made of special materials and structures, and thus allowing complete recovery after strain has occurred. In other words, in the nib structure of the stylus, due to the lack of the elastomer, the pressure-sensitive strain gauge scheme is difficult to completely recover in a short time after being stressed or overloaded for a long time (frequently), so that creep, fatigue and even structural damage are very easy to occur, and the measurement stability is poor. Meanwhile, in a narrow touch pen space, the assembly difficulty of assembling 2 groups or 4 groups of miniature piezoresistive strain gauges is high, and the assembly precision can greatly influence the measurement precision of the nib pressure sensing, so that the pressure sensing grading effect is influenced.
Disclosure of Invention
In view of the drawbacks of the prior art, according to a first aspect of the present invention, there is provided a pressure-sensitive grading sensing device of an electrostatic capacitive stylus having a shaft portion and a pen tip portion protruding from a front end of the shaft portion, the pressure-sensitive grading sensing device comprising:
a crankshaft arranged along the longitudinal axis direction of the pen body part and provided with a body, a first shaft end and a second shaft end which are positioned at two ends of the body; the first shaft end of the crankshaft is connected with the pen point part and can synchronously move with the pen point part, the second shaft end opposite to the crankshaft is sleeved in a central hole of a first supporting part in a sliding way, and the first supporting part is positioned in the pen body part and positioned at the tail part;
an elastic limit mechanism arranged between the body of the crankshaft and the first supporting part and used for accumulating force when the pen point part is pressed to enable the crankshaft to move towards the first supporting part, so that the crankshaft moves towards an initial position when the pressing is weakened or relieved;
the second supporting part is in a position fixing relation with the pen body part and is positioned in a cavity formed by the body of the crankshaft;
the first polar plate and the second polar plate are arranged in parallel between the second supporting part and an inner wall surface of the cavity, one polar plate is fixed on the surface of the second supporting part, and the other polar plate is fixed on the surface of the inner wall surface;
the capacitance measuring part is connected with the first polar plate and the second polar plate and is used for detecting the capacitance of the first polar plate and the second polar plate at different polar plate intervals;
and a pen tip pressure sensing measurement unit electrically connected to the capacitance measurement unit and configured to obtain a corresponding pen tip stress based on a value of the capacitance output from the capacitance measurement unit.
In some embodiments, the first and second support portions are configured as part of the body portion and remain relatively stationary with respect to the body portion.
In some embodiments, the first and second support portions are configured as separate members that are secured to the body portion and that remain relatively stationary with respect to the body portion.
In some embodiments, the first and second support portions are each block members perpendicular to the longitudinal axis of the barrel portion.
In some embodiments, the cavity formed by the body of the crankshaft is configured as a U-shaped cavity having a surface along one of two inner wall surfaces of the body in the longitudinal axis direction for mounting the first plate or the second plate. In particular, a surface of the other of the two inner wall surfaces is provided with a guide portion along which the body is provided to be movable.
In some embodiments, the resilient stop mechanism includes at least one spring, such as a coil spring, disposed about the outer peripheral surface of the second shaft end.
In some embodiments, the body portion, tip portion, first shaft end of the crankshaft, and second shaft end, first support portion, second support portion, and elastic limit mechanism are arranged concentrically.
According to a second aspect of the present invention, there is also provided a method for sensing pressure based on the aforementioned capacitive stylus pressure-sensing hierarchical sensing device, the method comprising the steps of:
the nib slides on the surface of the writing medium, the nib retracts towards the inside of the pen body based on the force applied by the writing, and the crankshaft moves synchronously;
based on the change of the plate spacing between the first plate and the second plate caused by the crank motion, the capacitance measuring part detects the capacitance at different plate spacings; and
and the nib pressure sensing measuring part obtains nib stress under the distance of the corresponding polar plates according to the value of the electrostatic capacity output by the capacitance measuring part.
According to a third aspect of the present invention, there is also provided a capacitive stylus using the pressure-sensitive graded induction device.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of claimed subject matter are considered part of the disclosed inventive subject matter.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an electrostatic capacitive stylus according to an embodiment of the invention.
Fig. 2 is a front view of the capacitive stylus of the embodiment of fig. 1, wherein the internal structure of the stylus body is partially exemplified.
Fig. 3 is a cross-sectional view of the capacitive stylus of the embodiment of fig. 1, showing an example of a pressure-sensitive stage sensing mechanism.
Fig. 4 is a schematic structural diagram of a crankshaft of a capacitive stylus according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a matching structure of a crankshaft and two supporting parts of a capacitive stylus according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a pressure-sensitive graded sensing device of a capacitive stylus according to an embodiment of the invention.
The reference numerals have the following meanings:
100-electrostatic capacity type touch pen; 10-a pen body part; 20-pen tip; 30-crank shaft; 31-body; 32-a first axial end; 33-a second axial end; 35-cavity; 36-a guide; 40-a first support; 50-an elastic limiting mechanism; 60-a second support; 101-a first polar plate; 102-a second plate; 200-capacitance measuring part; 300-nib pressure sensing measurement portion.
Description of the embodiments
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a number of ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
The capacitive stylus 100 of the embodiment shown in fig. 1-6 includes a body portion 10, a tip portion 20, and a pressure-sensitive stage sensing device located inside the body portion 10. The pressure-sensitive graded sensing means is used to sense and output the stress generated by the tip 20 based on the force applied by writing during the sliding of the writing medium surface, i.e., the pressure-sensitive output. Thus, a processor disposed within the capacitive stylus 100 and/or writing medium may implement various controls and switches based on the pressure-sensitive output, such as controlling different thicknesses of handwriting.
As shown in fig. 2, the body portion 10 is typically made of a suitable material, such as plastic, ceramic, or a composite material, and particularly has a matte finish on the outer surface, a Li Yuliang good grip. The nib 20 may be arranged to be coupled to the interior of the body 10 by a shaft.
As shown in fig. 1 and 2, for convenience of description, two ends of the pen body 10 are defined as a front end 11 (i.e., a head) and a rear end 12 opposite to the front end, respectively. The nib 20 protrudes from the front end 11 of the body 10, for example from the body 10 on an axis basis. In an alternative example, the writing tip of nib 20 is typically of a pom material, having a soft feel, to facilitate writing.
As shown in fig. 2 to 4, a crankshaft 30 is disposed in the longitudinal axis direction of the pen body 10 inside the pen body 10, and the crankshaft 30 has a body 31 and first and second shaft ends 32 and 33 at both ends of the body 31, as shown in fig. 3 and 4.
The first shaft end 32 of the crankshaft 30 is coupled to the nib 20, such as by threads, keyed connections, etc., such that a rigid, fixed connection is formed therebetween.
The second opposite end 33 of the crankshaft 30 is slidably received in a central bore 41 of a first support portion 40. As shown in FIG. 3, the first support portion 40 is positioned within the body portion 10 at a rearward position, and a central bore 41 is disposed in the longitudinal axial direction thereof coaxially with the axis of the body portion 10, the central bore 41 extending toward the rearward end 12 of the body portion 10.
In an alternative embodiment, the first support 40 is configured as part of the pen body 10.
In an alternative embodiment, the first shaft end 32 and the second shaft end 33 have the same cross-sectional shape and dimensions, for example involving an elongate cylindrical shaft, facilitating sliding movement and guiding at both ends. The second axial end 33 has a length that is greater than the length of the first axial end 32 in the direction along the aforementioned longitudinal axis.
In the example shown in fig. 3 and 5, the first shaft end 32 of the crank shaft 30 is connected to the pen tip 20, so that when the pen tip 20 of the capacitive stylus 100 performs writing sliding on the surface of the writing medium (for example, a display screen of a tablet computer device configured with a capacitive screen), the pen tip 20 is subjected to writing pressure to generate movement in the direction of the tail end 12, thereby pushing the crank shaft 30 to perform synchronous movement, and the second shaft end 33 of the crank shaft 30 slides in the direction of the tail end 12 in the central hole 41.
As shown in fig. 3 and 5, an elastic stopper mechanism 50, for example, a coil spring as shown, is disposed between the main body 31 of the crankshaft 30 and the first support portion 40, and is fitted around the outer periphery of the second shaft end 33 of the crankshaft 30, and when the pen tip 20 is pressed to move the crankshaft 30 toward the first support portion 40, the force is accumulated to move the crankshaft 30 toward the initial position when the pressing is weakened or released.
Referring to fig. 3 and 5, as the second shaft end 33 of the crankshaft 30 slides in the direction of the tail portion 12 within the central hole 41, the elastic stopper mechanism 50 (for example, a coil spring) is compressed and accumulated, whereby, when the pressure is released or relieved, the elastic stopper mechanism 50 based on the accumulated force will drive the crankshaft 30 to move toward the front end 11, and return to its original position.
As shown in connection with fig. 3, 4 and 5, the body 31 of the crankshaft 30 is formed with a cavity 35, particularly a U-shaped cavity. In this U-shaped cavity design, a surface of one of two inner wall surfaces thereof along the longitudinal axis direction of the body portion 10 is used for mounting the first plate 101 or the second plate 102. The other plate is mounted on the surface of the second support 60 in the U-shaped cavity and the plates are held in face-to-face distribution.
A second support portion 60 disposed within the U-shaped cavity, wherein the second support portion 60 is configured as part of the pen body portion 10, thereby maintaining a fixed positional relationship with the pen body portion 10. And, a certain gap is left between the sidewall surface of the second supporting portion 60 and the sidewall surface of the cavity 35, so as to facilitate the installation of two capacitor plates.
It is particularly preferable that the surface of the second supporting portion 60 and the surface of the inner wall surface of the cavity 35 are flat surfaces, so that the capacitor plate can be mounted.
In connection with the illustration, the surface of the other of the two inner wall surfaces of the U-shaped cavity is provided with a guide portion 36, whereby the body 31 can move along the guide portion 36.
In the example shown in fig. 3, 5, and 6, the first electrode plate 101 and the second electrode plate 102 are disposed in pairs, and are respectively located on a pair of inner wall surfaces of the second support portion 60 opposite to the cavity 35, and in the example shown in fig. 3, the first electrode plate 101 and the second electrode plate 102 are fixed by adhesion. The first and second electrode plates 101 and 102 are installed in the right-side space between the second support 60 and the cavity 35, respectively.
Based on the relative stationary state (relative position is unchanged) of the second support portion 60 and the pen body portion 10, when the pen tip portion 20 is pressed to cause displacement of the crankshaft 30 in the direction toward the tail portion 14, the plate spacing between the first plate 101 and the second plate 102 will be changeddThereby changing the capacitance value between the first plate 101 and the second plate 102.
In connection with the illustrated example, when pen tip 20 is displaced under pressure, first shaft end 32 and second shaft end 33 both move in the same direction in synchronization. In the example shown in fig. 3, the second shaft end 33 is displaced in the aforementioned center hole 41, and is guided by the center hole 41 so as to be kept moving in the direction of the center axis of the pen body 10.
In an alternative example, the front end 11 of the body portion 10 is at least partially in nested guiding relationship with the first axial end 32 of the crankshaft 30 such that the first axial end 32 of the crankshaft 30 is guided during movement and is maintained in movement along the central axis of the body portion 10.
In an alternative example, the first support 40, the second support 60 are configured as separate members fixed to the pen body 10 and both remain relatively stationary with respect to the pen body 10, thereby causing the plate spacing between the first plate 101 and the second plate 102 based on the change in the spacing between the inner wall surface of the cavity of the crankshaft 30 and the second support 60 during movement of the crankshaft 30 therebetweendThe capacitance value between the first plate 101 and the second plate 102 changes.
Of course, in other embodiments, the relationship between the first support 40, the second support 60 and the crankshaft 30 may be configured in other suitable manners, so that one of the capacitor plates (for example, the first plate 101) can be rigidly connected to the pen tip 20 and synchronously move, and can be limited by a spring to avoid overload; meanwhile, the other capacitor plate (for example, the second plate 102) is rigidly connected with the housing of the pen body 10 or is a part of the housing, and is always in a relatively static state with the pen body 10.
In some examples, the first support 40, the second support 60 are each block members perpendicular to the longitudinal axis of the barrel 10.
In the example shown in fig. 6, the capacitance measuring unit 200 is connected to the first electrode plate 101 and the second electrode plate 102, respectively, and is configured to detect the capacitance between the first electrode plate 101 and the second electrode plate 102 at different plate pitches.
Therefore, the pressure-sensing graded sensing mechanism consisting of the crankshaft 30, the first supporting part 40, the elastic limiting mechanism 50 (taking a coil spring as an example), the second supporting part 60, the first polar plate 101 and the second polar plate 102 according to the embodiment of the invention can realize sensing of the stress load of the pen point based on the change of the polar plate distance between the first polar plate 101 and the second polar plate 102, and realize capacitive pressure-sensing graded sensing output of the stylus pen with reliable structure and accurate measurement.
As a preferred example, the pen body 10, the pen tip 20, the first shaft end 32 of the crankshaft 30, the second shaft end 33, the first support 40, the second support 60, and the elastic stopper mechanism 50 are arranged concentrically.
Referring to fig. 3 and 6, the pressure-sensitive graded sensing mechanism according to the embodiment of the present invention is configured such that the plate pitches in the idle, loaded, full and overload states are as follows:
no load: d=d 0 ，d 0 Represents the plate spacing under no load, d 0 =0；
And (3) carrying: d=d σ ，d σ Represents the plate spacing under load, d σ= sigma/E, wherein sigma is nib stress, E is Young's modulus of the elastic limiting mechanism and is a constant;
full load: d=d, where D is the maximum compression of the elastic limit mechanism, i.e. the number of diameter turns, is a constant;
overload: because the spring limiting mechanism exists, overload cannot be generated, and therefore destructive influence on the electrostatic capacity type pressure sensing hierarchical structure cannot be generated, and the spring limiting mechanism plays a role in protection.
Thus, in the embodiment of the invention, the coil spring is in a relatively free state in the idle state, and the two capacitance plates (i.e. the first plate 101 and the second plate 102) are closely contacted, and the electrostatic capacitance is outputCNear infinity. Because the touch pen is more in a non-input state in the life cycle, the pressure-sensitive hierarchical sensing mechanism can better protect the measuring structure.
Meanwhile, in the loaded state, the coil spring is continuously compressed, the first polar plate 101 and the second polar plate 102 are separated and gradually pulled away, the electrostatic capacity output C is continuously reduced, and the high-reliability and high-stability linear relation with the compression ratio of the coil spring is maintained, so that the nib pressure feeling can be graded in a high resolution way, such as 4096 or higher.
Further, when the electrostatic capacitive stylus 100 provided by the invention falls carelessly, the first polar plate 101 and the second polar plate 102 will not damage the pressure sensing device due to instant impact due to the dual limit protection of the elastic limit mechanism 50 and the second support portion 60, so that the anti-falling performance and reliability of the electrostatic capacitive stylus are greatly improved.
As described above, in the embodiment of the present invention, the distance between the first polar plate 101 and the second polar plate 102 increases with the increase of the detected pressure at the nib, as shown in the drawing, the second polar plate 102 is fixed on the side wall of the cavity 35 formed by the body 31 of the crankshaft 30, and with the increase of the pressure at the nib, the distance between the second polar plate 101 and the first polar plate 101 fixed to the second supporting part 60 (for example, formed as a part of the pen body) is continuously increased, so that the capacitance output detection and the pressure detection are realized, and meanwhile, the design of the pressure-sensing graded sensing device and the measurement mode according to the present invention shown in fig. 2 and 3 is combined, because the elastic limiting mechanism 50 (such as a coil spring) located between the crankshaft 30 and the first supporting part 40 is limited and limited by the maximum deformation amount of the elastic limiting mechanism 50, the overload condition is not generated, so that the damage to the capacitive pressure-sensing graded structure is not generated, and the capacitive pressure-sensing graded structure is not damaged, and the capacitive sensing graded structure and the pressure-sensing device is not damaged by the instantaneous pressure sensing device due to accidental drop or other reasons.
It should be appreciated that the aforementioned resilient limiting mechanism 50 for overload protection may also be designed in other suitable ways, and is not limited to coil springs, e.g. wave springs, etc. may also be used.
In the embodiment of the present invention, the capacitance measuring unit 200 is configured, for example, as a high-resolution capacitance measuring chip, which is electrically connected to the pen tip pressure sensing unit 300 disposed in the pen body 10, and the corresponding pen tip stress is obtained based on the value of the capacitance outputted from the capacitance measuring unit 200.
In an alternative embodiment, the nib pressure sensing measurement 300 is arranged to obtain the nib stress according to the following manner:
σ = E*d σ = E*(kε 0 A)/C
wherein σ represents the nib stress, d σ Representing the plate spacing between the first plate 101 and the second plate 102 in the loaded state; e represents Young's modulus of the elastic limit mechanism 50, A represents plate areas of the first plate 101 and the second plate 102, k represents relative dielectric constant ε 0 The dielectric constant of the vacuum is indicated,Cthe capacitance value output from the capacitance measuring unit 200 is shown.
Wherein the vacuum dielectric constant ε 0 The general value is 8.854187817 multiplied by 10 -12 F/m. When the medium between the electrode plates is air, the relative dielectric constant k takes on a value of about 1.
Since the two first plates 101 and the second plate 102 are designed in the same way, the plate area a is determined by the design size and is constant.
Therefore, the nib stress sigma is highly linearly related to the measurement result 1/C, and compared with the linear piezoresistive strain gauge scheme, the linearity of the measurement result is only influenced by the Young modulus of the elastic limiting mechanism 50, so that an extremely high regression coefficient can be obtained, the value of the electrostatic capacitance output C can be obtained by stably and accurately measuring the change of the pole plate distance, the high-precision nib stress induction output can be realized, and the nib pressure sense can be graded with high resolution.
Compared with the existing design, the pressure-sensitive grading sensing device of the electrostatic capacitive stylus has the advantages of simple and reliable structural design, easy realization of assembly space and process, high precision, no overload damage and improvement of the pressure-sensitive grading effect. Meanwhile, compared with the scheme that the design of 2 or 4 groups of piezoresistive strain gauges is converted through a high-resolution analog-digital converter ADC, the invention can realize measurement by using a single capacitance measurement chip and simple calculation, and has low cost and better assembly precision.
It should be appreciated that the illustrations and the foregoing embodiments are intended to be exemplary descriptions of the design of a pressure-sensitive hierarchical sensing device of a capacitive stylus and its implementation principles, with the following components/modules also optionally included within the capacitive stylus 100: the electronic device comprises a lead for realizing electric connection, a battery module and/or a charge-discharge module for realizing power supply, a PCB board integrated with one or more functional circuits/chips, a communication module for realizing communication between the electrostatic capacitance type stylus 100 and external equipment, and a display module for realizing information characterization (including but not limited to a small display screen, an LED lamp group and the like).
In combination with the pressure-sensitive graded sensing device of the capacitive stylus disclosed in the embodiment of the invention, the process of the pressure-sensitive sensing method based on the pressure-sensitive graded sensing device comprises the following steps:
during sliding of nib 20 over the surface of the writing medium, nib 20 is caused to retract toward the interior of body 10 based on the force applied by the writing, and crankshaft 30 is caused to move synchronously;
based on the change of the plate spacing between the first plate 101 and the second plate 102 caused by the movement of the crankshaft 30, the capacitance at the different plate spacing is detected by the capacitance measuring section 200; and
the pen tip stress at the corresponding pad pitch is obtained by the pen tip pressure sensing measurement unit 300 from the value of the capacitance output from the capacitance measurement unit 200.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (12)
1. A pressure-sensitive hierarchical sensing device of an electrostatic capacity type stylus having a body portion (10) and a tip portion (20) extending from a front end of the body portion (10), the pressure-sensitive hierarchical sensing device comprising:
a crankshaft (30) arranged along the longitudinal axis direction of the pen body (10) and having a body (31), a first shaft end (32) and a second shaft end (33) at both ends of the body (31); the first shaft end (32) of the crankshaft (30) is connected with the pen tip (20) and can synchronously move with the pen tip (20), the second shaft end (33) opposite to the crankshaft (30) is slidably sleeved in a central hole (41) of a first supporting part (40), and the first supporting part (40) is positioned in the pen body (10) and positioned at the tail part;
an elastic limit mechanism (50) arranged between the body (31) of the crankshaft (30) and the first support part (40) and configured to store a force when the pen tip part (20) is pressed to move the crankshaft (30) toward the first support part (40) so as to move the crankshaft (30) toward an initial position when the pressing is weakened or released;
a second support portion (60) in fixed positional relationship with the pen body portion (10) and located within a cavity (35) formed by a body (31) of the crankshaft (30);
the first polar plate (101) and the second polar plate (102) are arranged in parallel between the second supporting part (60) and an inner wall surface of the cavity (35);
a capacitance measurement unit (200) connected to the first electrode plate (101) and the second electrode plate (102) and configured to detect the capacitance between the first electrode plate (101) and the second electrode plate (102) at different plate pitches;
and a pen tip pressure sensing unit (300) electrically connected to the capacitance measuring unit (200) and configured to obtain a corresponding pen tip stress based on the value of the capacitance output from the capacitance measuring unit (200).
2. The capacitive stylus pressure-sensitive hierarchical sensing device according to claim 1, wherein the first support portion (40) and the second support portion (60) are configured as part of the stylus body portion (10) and remain relatively stationary with respect to the stylus body portion (10).
3. The capacitive stylus pressure-sensitive hierarchical sensing device of claim 1, wherein the first support portion (40), the second support portion (60) are configured as separate members that are secured to the body portion (10) and that remain relatively stationary with respect to the body portion (10).
4. A pressure-sensitive grading sensor according to claim 2 or 3, characterized in that the first and second support parts (40, 60) are block-shaped members perpendicular to the longitudinal axis of the body part (10).
5. The capacitive stylus pressure-sensitive graded induction device according to claim 1, wherein the surface of the second support portion (60) and the surface of the inner wall surface are both flat surfaces.
6. The pressure-sensitive stepped induction device of a capacitive stylus according to claim 1, wherein the cavity (35) formed by the body (31) of the crankshaft (30) is configured as a U-shaped cavity, a surface of which along one of two inner wall surfaces in a longitudinal axis direction of the stylus body portion (10) is used for mounting the first plate (101) or the second plate (102).
7. The capacitive stylus pressure-sensitive graded induction device according to claim 6, wherein a guide (36) is provided on a surface of the other of the two inner wall surfaces, and the body (31) is provided so as to be movable along the guide (36).
8. The capacitive stylus pressure-sensitive grading sensing device of claim 1, wherein the elastic limiting mechanism (50) comprises at least one spring.
9. The pressure-sensitive graded sensing device of the capacitive stylus according to claim 1, wherein the elastic limiting mechanism (50) is sleeved on the outer peripheral surface of the second shaft end (33).
10. The pressure-sensitive graded sensing device of a capacitive stylus according to claim 1, wherein the body portion (10), the nib portion (20), the first shaft end (32) of the crankshaft (30) and the second shaft end (33), the first support portion (40), the second support portion (60), and the elastic limit mechanism (50) are arranged concentrically.
11. A pressure-sensitive sensing method based on the pressure-sensitive graded sensing device of the capacitive stylus according to any one of claims 1 to 10, characterized by comprising the steps of:
the nib (20) of the electrostatic capacity type stylus slides on the surface of the writing medium, the nib (20) retracts towards the inside of the pen body (10) based on the force applied by writing, and the crank shaft (30) moves synchronously;
based on the change of the plate spacing between the first plate (101) and the second plate (102) caused by the movement of the crankshaft (30), the capacitance measuring part (200) detects the capacitance at different plate spacing; and
the nib pressure sensing unit (300) obtains nib stress at the corresponding plate pitch from the value of the capacitance output from the capacitance measuring unit (200).
12. An electrostatic capacitive stylus using the pressure-sensitive hierarchical sensing device of any one of claims 1-10.
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| CN116301411B (en) | 2023-08-04 |
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