CN112148108A - Pressure detection device and intelligent pen - Google Patents
Pressure detection device and intelligent pen Download PDFInfo
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- CN112148108A CN112148108A CN202011133847.9A CN202011133847A CN112148108A CN 112148108 A CN112148108 A CN 112148108A CN 202011133847 A CN202011133847 A CN 202011133847A CN 112148108 A CN112148108 A CN 112148108A
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- pressure
- pressure sensor
- sensor
- receiving member
- pen
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
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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
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of intelligent writing devices, and provides a pressure detection device and an intelligent pen. The pressure detection device of the present invention includes: the pressure receiving piece is used for transmitting the pressure to be detected to the first sensor and/or the second sensor; a first pressure sensor for detecting a pressure acting on a pressure receiving member, the pressure receiving member being detachably connected to the first pressure sensor; the second pressure sensor is used for detecting the pressure acting on the pressure-receiving piece; the controller is electrically connected with the first pressure sensor and the second pressure sensor respectively; the first pressure sensor and the second pressure sensor are connected in a synchronously pressurized manner. The intelligent pen comprises the pressure detection device, so that the power consumption of the pressure detection device and the power consumption of the intelligent pen can be greatly reduced, and the pressure detection precision can be obviously improved.
Description
Technical Field
The invention relates to the technical field of intelligent writing devices, in particular to a pressure detection device and an intelligent pen.
Background art
Along with the popularization of distance education and intelligent education, the related technology of the intelligent pen is greatly developed. The existing intelligent pen not only has the writing function of the traditional pen, but also can collect writing handwriting when a micro-image array is printed for writing, and stores and transmits the handwriting in an electronic mode. The principle of the method is that the position of a pen point relative to a printed micro-graphic array during writing is collected through a camera arranged on a pen point, and then handwriting is generated through image processing and coordinate transformation.
At present, in order to present the thickness change of a writing stroke according to the writing strength change, a pressure sensor is often needed to measure the pressure applied to a pen core during writing. At present, a film resistance strain type pressure Sensor (Force Sensor Resistor) is adopted to measure the pressure of a pen core during writing, but due to the fact that the linearity of a pressure-resistance curve of the pressure Sensor is poor, slight changes of writing pressure cannot be effectively distinguished. On the other hand, the repeatability is not good, namely the same pressure is applied after the pressure is released, the resistance value is repeatedly measured, and the variance of the resistance value is larger, so that the sensor can lead to the same writing strength and the thickness of the presented strokes to be different. At present, a bridge-type Pressure Sensor (Resistive-bridge Pressure Sensor) is also adopted to measure the Pressure of the pen core during writing, but the Pressure Sensor has a relatively flat curve of Pressure-resistance, so that the change amplitude of a voltage signal obtained by conversion is small, the voltage signal cannot be directly used as a wake-up signal of a microcontroller, the signal must be amplified before AD sampling, and zero offset calibration is required during use.
Disclosure of Invention
In view of this, embodiments of the present invention provide a pressure detection apparatus and a smart pen, so as to solve the technical problem that the pressure detection apparatus and the smart pen in the prior art cannot achieve high-precision pressure measurement under the condition of low power consumption.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a pressure detection apparatus, comprising:
the pressure receiving piece is used for transmitting the pressure to be detected to the first sensor and/or the second sensor;
a first pressure sensor for detecting a change in pressure acting on a pressure receiving member, the pressure receiving member being detachably connected to the first pressure sensor;
the second pressure sensor is used for detecting the pressure acting on the pressure-receiving piece;
the controller is electrically connected with the first pressure sensor and the second pressure sensor respectively and used for starting or finishing the processing of the electric signal of the second pressure sensor according to the detection signal of the first pressure sensor;
the first pressure sensor and the second pressure sensor are connected in a synchronously pressurized manner.
Preferably, the pressure receiving member abuts against the first pressure sensor when in a compressed state, and is separated from the first pressure sensor when in an uncompressed state.
Preferably, the device further comprises a prepressing part, and the second pressure sensor forms prepressing with the prepressing part so as to be synchronously pressed with the first pressure sensor when the first pressure sensor is pressed.
Preferably, the second pressure sensor and the prepressing part are connected through magnetic attraction.
Preferably, still include support and first slider, first slider with the support is sliding connection, the support is kept away from the one end of pressed, first pressure sensor is located the one end that first slider is pressed towards, the one end at the fixed part of first slider orientation is installed to second pressure sensor, first slider with the fixed part is through magnetism to form the connection.
Preferably, the pre-pressing member is disposed at an end of the first slider facing the second pressure sensor, the pre-pressing member is a magnetic member, and the second pressure sensor is a pressure sensor attracted by the magnetic member.
Preferably, still include support and first slider, first slider with the support is sliding connection, the support is kept away from the one end of pressed piece is provided with the fixed part, first pressure sensor is located the one end that first slider orientation pressed piece, second pressure sensor installs at first slider orientation the one end of fixed part, first slider with the fixed part is inhaled through magnetism and is formed the connection, the setting of prepressing is in the fixed part orientation the one end of second pressure sensor.
Preferably, a contacting member is further disposed at an end of the pressure receiving member facing the first pressure sensor, and the pressure receiving member brings the contacting member into contact with the first pressure sensor when receiving a pressure.
Preferably, the pressure sensor further comprises a signal amplification circuit and an analog-to-digital conversion circuit, the signal amplification circuit is electrically connected with the second pressure sensor and the controller respectively, the analog-to-digital conversion circuit is electrically connected with the signal amplification circuit and the controller respectively, and the controller turns on or off the signal amplification circuit and the analog-to-digital conversion circuit according to a detection signal of the first pressure sensor. .
In a second aspect, the invention further provides an electric smart pen, which includes a housing and the pressure detection device of the first aspect, the pressure receiving member is used as a pen core of the smart pen, and a first chamber for accommodating the pen core is arranged in the housing.
Has the advantages that: the pressure detection device and the intelligent pen adopt the first pressure sensor with low power consumption and the second pressure sensor with high measurement precision to perform pressure detection in a coordinated mode, and the first pressure sensor and the second pressure sensor are installed and connected in a synchronous pressing mode, so that the second pressure sensor and the first pressure sensor can synchronously sense the pressure to be measured, and the mode of accurately detecting the pressure by using the second pressure sensor is conveniently and accurately opened or closed. The pressure piece is arranged in a connection mode that the pressure piece can be separated from the first pressure sensor, so that the pressure piece cannot touch the first pressure sensor by mistake when the pressure piece is not pressed, and therefore the pressure detection device and the intelligent pen have the advantages that the power consumption is greatly reduced, and the detection precision of pressure detection is remarkably improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
FIG. 1 is a structural layout diagram of the pressure detecting device of the present invention;
fig. 2 is a schematic structural diagram of a pressure detection apparatus in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a pressure detection apparatus in embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a pressure detection apparatus in embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of a smart pen according to the present invention, which employs the pressure detection apparatus in embodiment 2;
fig. 6 is a schematic structural diagram of a smart pen according to the present invention, which employs a pressure detection apparatus in embodiment 3;
fig. 7 is a schematic structural diagram of a smart pen according to the present invention, which employs the pressure detection apparatus in embodiment 4;
FIG. 8 is a block diagram of the circuit structure of the pressure detecting device of the present invention;
FIG. 9-1 is a photograph of a first set of text written with the smart pen of the present invention;
FIG. 9-2 is a diagram of a first set of text collection results written with the smart pen of the present invention;
FIGS. 9-3 are photographs of a first set of text written with a prior art smart pen;
FIGS. 9-4 are graphs of a first set of text collection results written with a prior art smart pen;
FIG. 10-1 is a photograph showing the effect of a second set of text written with the smart pen of the present invention;
FIG. 10-2 is a diagram of a second set of text collection results written with the smart pen of the present invention;
FIG. 10-3 is a photograph of a second set of text written with a prior art smart pen;
FIGS. 10-4 are graphs of a second set of text collection results written with a prior art smart pen;
parts and numbering in the figures: the pressure receiving part 10, the touch pressing part 11, the first pressure sensor 20, the second pressure sensor 30, the bracket 40, the fixing part 50, the first magnetic part 51, the second magnetic part 52, the third magnetic part 53, the conductive silicon rubber 54, the metal elastic sheet 55, the top shaft 56, the first sliding part 61, the second sliding part 62, the shell 71, the first PCB 72, the optical filter 81, the lens 82, the image sensor 83 and the power supply 90.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In case of conflict, it is intended that the embodiments of the present invention and the individual features of the embodiments may be combined with each other within the scope of the present invention.
Example 1:
as shown in fig. 1, the present embodiment provides a pressure detection apparatus including:
a pressure receiving member 10 for transmitting a pressure to be detected to the first sensor and/or the second sensor;
a first pressure sensor 20 for detecting a pressure applied to the pressure receiving member 10, the pressure receiving member 10 being detachably connected to the first pressure sensor 20;
wherein the first pressure sensor 20 may be a thin film resistance strain gauge pressure sensor. The pressure-resistance curve dynamic range of the sensor is large, the change of the resistance can be directly used as a startup awakening signal without amplification after being converted into a voltage signal, the automatic startup function of writing is supported, and the AD sampling digitization can also be directly provided.
The pressure receiving member 10 functions to transmit pressure, and pressure to be detected is transmitted to the first pressure sensor 20 and the second pressure sensor 30 through the pressure receiving member 10, so as to be detected. In the present embodiment, the pressure receiving member 10 abuts against the first pressure sensor 20 when in a compressed state, and is separated from the first pressure sensor 20 when the pressure receiving member 10 is in an uncompressed state. The present embodiment uses the pressure change detected by the first pressure sensor 20 to decide whether to start or end the processing and collecting of the signal detected by the second pressure sensor 30. When the pressure is not applied, the pressure receiving member 10 is separated from the first pressure sensor 20, so that the pressure receiving member 10 is prevented from contacting the first pressure sensor 20 to generate pressure on the first pressure sensor 20, and the pressure detection result is not accurate.
A second pressure sensor 30 for detecting the magnitude of the pressure acting on the pressure receiving member 10;
wherein the second pressure sensor 30 may be a bridge type pressure sensor. On one hand, the sensor has good linearity of a pressure-resistance curve and can well distinguish slight change of writing pressure. On the other hand, the repeatability is good, namely the same pressure is applied after the pressure is released, the resistance is repeatedly measured, the variance of the resistance value is small, and the effect of good consistency of stroke thickness presented by the same writing force can be achieved by adopting the sensor.
A controller electrically connected to the first pressure sensor 20 and the second pressure sensor 30, respectively;
the pressure detection device of this embodiment makes pressure piece 10 and first pressure sensor 20 butt when pressurized, can make first pressure sensor 20 in time detect pressure change, triggers detection device and handles and gather the signal of telecommunication of second sensor, makes pressure can in time transmit for second pressure sensor 30 simultaneously, lets detection device can in time accurately measure the pressure size of waiting to detect according to the signal that second pressure sensor 30 detected.
The controller receives the electrical signal of the first pressure sensor 20, and the first pressure sensor 20 adopts a pressure sensor with a large dynamic range of a pressure-resistance curve, so that the voltage signal of the first pressure sensor 20 can be directly sent to the controller without amplification, the controller controls related equipment to start and wake up according to the voltage signal of the first pressure sensor 20, and also can control whether to process and collect the electrical signal of the second pressure sensor 30 according to the voltage signal of the first pressure sensor 20. Because this embodiment has adopted the mode of first pressure sensor 20 and second pressure sensor 30 collaborative work, through adopting the operating mode that the pressure variation that the little first pressure sensor 20 of energy consumption detected controls pressure detection device, make pressure detection device only adopt the second pressure sensor 30 that detects the precision height and good repeatability to accurately obtain the pressure value that waits to detect when satisfying the settlement condition, only adopt first pressure sensor 20 to detect the pressure variation when not satisfying the condition, so both make pressure detection device's consumption greatly reduced, the detection precision of pressure detection device who shows the improvement again.
The first pressure sensor 20 and the second pressure sensor 30 are connected in a synchronously pressurized manner.
The synchronous pressure connection is a connection structure or a connection form that is sufficient to enable the second pressure sensor 30 and the first pressure sensor 20 to synchronously sense the pressure to be detected. This connection or connection configuration allows the force-bearing surface of the first pressure sensor 20 and the force-bearing surface of the second pressure sensor 30 to remain rigidly connected in a fixed relative position even when the pressure detection device is not subjected to the pressure to be measured. For the synchronously stressed connection structures or connection forms, see examples 2 to 4.
Example 2
As shown in fig. 2 and 3, in the present embodiment, the pressure detecting apparatus further includes a preload member for providing a preload to the second pressure sensor 30, the second pressure sensor 30 abutting against the preload member to be pressed in synchronization with the first pressure sensor 20 when pressed. In the present embodiment, the second pressure sensor 30 is in a pre-compression state with a small force by the pre-compression member, so that the second pressure sensor 30 can be reliably abutted against the pre-compression member even in a state that the pressure receiving member 10 is not pressed and the first pressure sensor 20 is separated from each other, and the second pressure sensor 30 has no space capable of freely moving. When the pressed part 10 is pressed and abutted against the first pressure sensor 20, the second pressure sensor 30 and the pre-pressing part are always kept in an abutting state, so that the pressure transmitted by the pressed part 10 can be immediately transmitted to the stressed surface of the second pressure sensor 30 through the pre-pressing part, and the second pressure sensor 30 and the first pressure sensor 20 can synchronously sense the pressure action of the pressed part 10.
As a preferred example, the second pressure sensor 30 is connected to the pre-pressing member by magnetic attraction. The magnetic connection means that the second pressure sensor 30 is kept in contact with the pre-pressing member by the action of a magnetic field, using the opposite attraction of the magnetic members. The magnetic coupling method of the present embodiment can provide the second pressure sensor 30 with an accurate pre-compression pressure, compared to the method of maintaining the pre-compression state by using an elastic member such as a spring, and the pressure of the set value can be stably maintained for a long period of time without being changed after a plurality of times of pressure bearing as in the case of the elastic member.
In order to ensure that the first pressure sensor 20 and the second pressure sensor 30 can be synchronously pressed, the pressure detection device of the embodiment further comprises a support 40 and a first sliding part 61, the first sliding part 61 is connected with the support 40 in a sliding manner, one end of the support 40, which is far away from the pressed part 10, is provided with a fixing part 50, the first pressure sensor 20 is located at one end of the first sliding part 61, which faces the pressed part 10, the second pressure sensor 30 is installed at one end of the fixing part 50, which faces the first sliding part 61, and the first sliding part 61 and the fixing part 50 are connected through magnetic attraction.
The present embodiment mounts the first pressure sensor 20 and the second pressure sensor 30 on the first slider 61 and the fixing portion 50 of the bracket 40, respectively. The first pressure sensor 20 can slide together with the first slider 61 relative to the bracket 40. Because the first sliding part 61 and the fixing part 50 are connected through magnetic attraction, the first sliding part 61 tends to be pressed against the fixing part 50 under the action of a magnetic field, and because the second pressure sensor 30 is installed at one end of the fixing part 50 facing the first sliding part 61, the end of the first sliding part 61 facing the fixing part 50 is pressed against the stressed surface of the second pressure sensor 30 under the action of the magnetic field, so as to generate a pre-pressing action on the second pressure sensor 30, and at this time, the pressed part of the first sliding part 61 and the second pressure sensor 30 is used as the pre-pressing part. Because the first pressure sensor 20 is fixed on the first slider 61 and moves synchronously with the first slider 61, when the pressure-receiving member 10 is pressed to move to abut against the first pressure sensor 20 to generate pressure on the first pressure sensor 20, the first slider 61 is pushed to further press and contact the second sensor towards the second pressure sensor 30, and because the second pressure sensor 30 is always pressed against the first slider 61 under the pre-pressing action, the pressure of the pressure-receiving member 10 is transmitted to the second pressure sensor 30 while the first slider 61 is pushed by the pressure-receiving member 10, so that the pressure-receiving member can be synchronously pressed with the first pressure sensor 20.
In order to connect the first sliding member 61 and the fixing portion 50 by magnetic attraction, in this embodiment, the fixing portion 50 is provided with a first magnetic member 51, and the first sliding member 61 is provided with a second magnetic member 52 attracted to the first magnetic member 51. By respectively arranging two magnetic pieces which are mutually attracted on the fixing part 50 of the first sliding piece 61, the first sliding piece 61 is driven to be tightly abutted against the fixing part 50 by the attraction effect of the two magnetic pieces to form magnetic attraction connection, so that the first sliding piece 61 generates a pre-compression effect on the second pressure sensor 30. In an implementation, a mounting groove is formed on the first sliding member 61, the second magnetic member 52 is mounted in the mounting groove, a mounting groove is formed on the fixing portion 50, and the first magnetic member 51 is mounted in the mounting groove. The magnetic member may be made of a magnetic material (Fe, Co, Ni element and alloy thereof).
In this embodiment, a top shaft 56 may be provided at an end of the first slider 61 facing the fixing portion 50 as a pre-pressing member, and the top shaft 56 is used to abut against the second pressure sensor 30 under the magnetic attraction effect and generate a pre-pressing effect on the second pressure sensor 30. The top shaft 56 may also be made of a magnetic material, so that the top shaft 56 is tightly pressed against the second pressure sensor 30 under the attraction of the first magnetic member 51. In the present embodiment, a conductive silicone rubber 54 may be further disposed below the position of the bracket 40 corresponding to the first slider 61, and the conductive silicone rubber 54 makes an electrical connection between the first PCB board 72 and the first pressure sensor 20. A metal spring 55 is disposed below the fixing portion 50, and the metal spring 55 electrically connects the first PCB 72 and the second pressure sensor 30.
Example 3
As shown in fig. 3, in this embodiment, the pressure detection apparatus further includes a bracket 40 and a first sliding member 61, the first sliding member 61 is slidably connected to the bracket 40, a fixing portion 50 is disposed at an end of the bracket 40 away from the pressure receiving member 10, the first pressure sensor 20 is located at an end of the first sliding member 61 facing the pressure receiving member 10, the second pressure sensor 30 is mounted at an end of the fixing portion 50 facing the first sliding member 61, and the first sliding member 61 and the fixing portion 50 are connected by magnetic attraction. Wherein the first slider 61 is provided with a top shaft 56 as a pre-pressing member toward the first end of the fixing portion 50, wherein the top shaft 56 is a magnetic member made of a magnetic material. The second pressure sensor 30 is a pressure sensor that can be attracted by a magnetic member, i.e., the top shaft 56, and is made of a material that can be attracted by a magnetic member. Thus, the top shaft 56 and the second pressure sensor 30 are attracted to each other by the magnetic field, so that the top shaft 56 and the second pressure sensor 30 are kept in contact. In the manner described above, the top shaft 56 can form a pre-compression effect on the second pressure sensor 30, thereby ensuring that the second pressure sensor 30 and the first pressure sensor 20 can be synchronously compressed. The structure of this embodiment has avoided adding extra magnetic part owing to utilized the effect of inhaling of apical axis 56 and second pressure sensor 30 self, makes pressure measurement device's structure simpler, greatly reduced the cost, it is more convenient to make. In the present embodiment, a conductive silicone rubber 54 may be further disposed below the position of the bracket 40 corresponding to the first slider 61, and the conductive silicone rubber 54 makes an electrical connection between the first PCB board 72 and the first pressure sensor 20. A metal spring 55 is disposed below the fixing portion 50, and the metal spring 55 is electrically connected between the first PCB 72 and the second pressure sensor 30.
Example 4
As shown in fig. 4, in the present embodiment, the pressure detecting apparatus further includes a bracket 40 and a first sliding member 61, the first sliding member 61 is slidably connected to the bracket 40, a fixing portion 50 is disposed at an end of the bracket 40 away from the pressure receiving member 10, the first pressure sensor 20 is located at an end of the first sliding member 61 facing the pressure receiving member 10, the second pressure sensor 30 is mounted at an end of the first sliding member 61 facing the fixing portion 50, the first sliding member and the fixing portion 50 are connected by magnetic attraction, and the pre-pressing member is disposed at an end of the fixing portion 50 facing the second pressure sensor 30.
The present embodiment mounts the first pressure sensor 20 and the second pressure sensor 30 at both ends of the first slider 61, respectively, wherein the first pressure sensor 20 faces the pressure receiving member 10, and the second pressure sensor 30 faces the fixing portion 50. Since the first pressure sensor 20 and the second pressure sensor 30 are both provided on the first slider 61. And because the first slider and the fixing part 50 are connected through magnetic attraction, the prepressing piece and the second pressure sensor 30 are always kept in a prepressing state, when the pressed piece 10 is in contact with the first pressure sensor 20, the first slider 61 is pushed, the first slider 61 drives the second pressure sensor 30 to generate a trend of moving towards the fixing part 50, the second pressure sensor 30 can immediately sense the pressure generated by the prepressing piece on the second pressure sensor 30, and therefore the second pressure sensor 30 and the first pressure sensor 20 are synchronously pressed. The pre-pressing member disposed on the fixing portion 50 may be a third magnetic member 53, and the second pressure sensor 30 may be a self-magnetic pressure sensor. The first magnetic member 51 and the second magnetic member 52 may be provided on the fixed portion 50 and the first slider 61, respectively. In this embodiment, a metal spring 55 may be further disposed below the position of the bracket 40 corresponding to the first sliding member 61, and the metal spring 55 is electrically connected between the first PCB 72 and the second pressure sensor 30. An electrically conductive silicone rubber 54 is provided at the rear end of the pressure receiving member 10, and the electrically conductive silicone rubber 54 makes an electrical connection between the first PCB board 72 and the first pressure sensor 20.
Example 5
As shown in fig. 2 to 4, this embodiment is further optimized based on the foregoing embodiments, and a touching member 11 is further disposed at an end of the pressure receiving member 10 facing the first pressure sensor 20, and the pressure receiving member 10 brings the touching member 11 into touch with the first pressure sensor 20 when receiving a pressure. The touch pressing member 11 may be made of elastic materials such as silicone, plastic, rubber, and steel. The member may be provided at the rear end of the pressure receiving member 10, and when the pressure receiving member 10 is pressed, the member contacts and presses the first pressure sensor 20, so that the first pressure sensor 20 can sense the pressure applied to the pressure receiving member 10. The pressure receiving member 10 is easy to shake in the moment of contact and separation of the first pressure sensor 20, and the pressure receiving member 11 is made of a material with certain elasticity, so that when the pressure receiving member 10 is under pressure, the pressure receiving member 11 can be more fully and reliably pressed on the first pressure sensor 20, and the reliability and accuracy of the pressure detection device are further improved. In order to achieve abutment of the pressure receiving member 10 with the first pressure sensor 20 in a compressed state and separation from the first pressure sensor 20 in a non-compressed state. The present embodiment is further provided with a second slider 62, the second slider 62 being connected in a slidable manner with respect to the bracket 40. The pressure receiving member 10 is connected with the second sliding member 62, so that the pressure receiving member 10 can slide relative to the bracket 40, when the pressure receiving member 10 is pressed, the pressure receiving member can slide to a position abutting against the first pressure sensor 20, when the sliding member is in a non-pressed state, the pressure receiving member can slide to one end far away from the fixing part 50, and the first pressure sensor 20 is fixed at one end close to the fixing part 50 of the bracket 40 due to the magnetic attraction effect, so that the separation from the first pressure sensor 20 is realized. The second slider 62 may be mounted at the rear of the pressure receiving member 10, and the aforementioned member may be mounted at the end of the second slider 62 facing the first pressure sensor 20, so that when the pressure receiving member 10 is subjected to the pressure to be detected, the second slider 62 is pushed to slide, and the second sliding strip contacts and presses the first pressure sensor 20.
Example 5
As shown in fig. 5, 6 and 7, the present embodiment provides a smart pen, which includes a housing 71 and the pressure detection device described in the previous embodiments, the pressure receiving member 10 serves as a pen core of the smart pen, and a first chamber for accommodating the pen core is provided in the housing 71. The smart pen in this embodiment is one of the pressure detection devices in the foregoing embodiments, and has an application mode. The cartridge as the pressure receiving member 10 may be mounted in a sliding groove defined by the housing 71 and the holder 40, and the cartridge may slide in the sliding groove. The first pressure sensor 20, the second pressure sensor 30 and the like in the pressure detection device with one end of the pen core used for writing extending out of the shell 71 are installed inside the shell 71. The first pressure sensor 20 in the pressure detection means may be used as a write-to-trigger power-on. That is, when the pressure detected by the first pressure sensor 20 exceeds the set threshold, the controller controls the smart pen to be in the power-on state. The first pressure sensor 20 may also be used to determine pen-down and pen-up of writing, for example, when the pressure detected by the first pressure sensor 20 is greater than a set threshold, the controller determines that writing is in a pen-down state, and when the pressure detected by the first pressure sensor 20 is less than the set threshold, the controller determines that writing is in a pen-up state. When the controller judges that the pen is dropped through the detection signal of the first pressure sensor 20, the signal amplifying circuit of the second pressure sensor 30 is started, the signal acquired by the second pressure sensor 30 is amplified, the AD sampler can be started to sample the output signal of the amplifying circuit, the sampling result is used for controlling the thickness of the stroke display, and after the controller judges that the pen is lifted through the first pressure sensor 20, the signal amplifying circuit of the second pressure sensor 30 is closedAnd the signal amplifying circuit stops AD sampling, so that the aim of saving power consumption is fulfilled. In the embodiment, the passive first pressure sensor 20 is used as a starting trigger signal and a pen-down and pen-up indicating signal, so that the power consumption of the whole machine can be saved; the writing pressure of the pen point is acquired with high precision by using the second pressure sensor 30, and the thickness change of the written handwriting is restored with high fidelity. The controller collects the AD output values of the second pressure sensors 30 for N times each time the controller detects a pen-up signal, calculates an average value as the output zero offset value of the second pressure sensor 30 of the next stroke, and subtracts the zero offset value from the output value of the second pressure sensor 30 to obtain the calibrated output value of the second pressure sensor 30, so that the writing 'pen front' effect can be reproduced. The controller can also judge the pen lifting state and the pen falling state of the intelligent pen according to the detection signal of the first pressure sensor, wherein the controller can eliminate the zero offset of the second pressure sensor when the intelligent pen writes according to the pressure value detected by the second pressure sensor when the pen lifting state is last time. For example, when the smart pen is lifted, the pressure value of the second pressure sensor is P0(P0Either positive or negative), the controller will control P0Recording, dropping the intelligent pen to contact with the writing medium, and detecting the pressure value P by the second pressure sensor1Let the pressure value after eliminating zero offset be PrThen P isr＝P1-P0
Because the pressure detection device in this embodiment adopts the aforementioned synchronous pressure connection structure, the second pressure sensor 30 is pre-compressed with a small force, and the force-bearing surface of the first pressure sensor 20 and the force-bearing surface of the second pressure sensor 30 have no free space in the pen-lifting state, so that the pressure applied to the first pressure sensor 20 is inevitably applied to the second pressure sensor 30, thereby ensuring that the pressure between the pen point and the paper surface is simultaneously transmitted to the first pressure sensor 20 and the second pressure sensor 30. Since the pressure detection device in the smart pen magnetically positions the first pressure sensor 20 and the second pressure sensor 30 at one end of the bracket 40, gravity in the pen-up state causes the pen core and the second sliding member 62 clamping the pen core to be located at the other side of the sliding slot. Therefore, the tail of the pen core is separated from the two sensors when the intelligent pen is lifted, the pen lifting and falling state can be accurately judged, and wrong connection of strokes, such as wrong connection of the tail of one independent stroke and the head of the next independent stroke, is effectively avoided. In addition, this embodiment still is provided with power 90, and power 90 is connected with the controller electricity to along with each components and parts power supply of smart pen. The smart pen of this embodiment is further provided with an image capturing device, which includes an optical filter 81, a lens 82 and an image sensor 83, wherein the image sensor 83 is electrically connected to the first PCB 72. The image acquisition device is used for acquiring images during writing. Light rays of an image to be collected are filtered by the optical filter 81 and then focused to the image sensor 83 through the lens 82, and the image sensor 83 converts optical signals into electric signals and sends the electric signals to the controller.
The comparison of the acquisition effect of the writing of the intelligent pen can be seen in fig. 9-1, 9-2, 9-3, 9-4, 10-1, 10-2, 10-3 and 10-4. From the foregoing figures, it can be seen that the effect of the variation of the stroke shape and the stroke weight of the characters collected by the intelligent pen of the present invention in fig. 9-2 and fig. 10-2 is better than that of the variation of the stroke shape and the stroke weight of the characters collected by the prior art intelligent pen in fig. 9-4 and fig. 10-4.
The above is a detailed description of the pressure detection device and the smart pen provided by the embodiment of the present invention.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (11)
1. Pressure detection device, its characterized in that includes:
the pressure receiving piece is used for transmitting the pressure to be detected to the first sensor and/or the second sensor;
a first pressure sensor for detecting a change in pressure acting on a pressure receiving member, the pressure receiving member being detachably connected to the first pressure sensor;
the second pressure sensor is used for detecting the pressure acting on the pressure-receiving piece;
the controller is electrically connected with the first pressure sensor and the second pressure sensor respectively and used for starting or finishing the processing of the electric signal of the second pressure sensor according to the detection signal of the first pressure sensor;
the first pressure sensor and the second pressure sensor are connected in a synchronously pressurized manner.
2. The pressure detection device according to claim 1, wherein the pressure receiving member abuts against the first pressure sensor when the pressure receiving member is in a compressed state, and is separated from the first pressure sensor when the pressure receiving member is in an uncompressed state.
3. The pressure detecting apparatus according to claim 1, further comprising a pre-pressing member, the second pressure sensor being pre-pressed with the pre-pressing member to be pressed in synchronization with the first pressure sensor when the first pressure sensor is pressed.
4. The pressure detecting device according to claim 3, wherein the second pressure sensor is connected to the pre-pressing member by magnetic attraction.
5. The pressure detection device according to claim 4, further comprising a bracket and a first sliding member, wherein the first sliding member is slidably connected to the bracket, a fixing portion is disposed at an end of the bracket away from the pressure receiving member, the first pressure sensor is located at an end of the first sliding member facing the pressure receiving member, the second pressure sensor is mounted at an end of the fixing portion facing the first sliding member, and the first sliding member and the fixing portion are connected by magnetic attraction.
6. The pressure detecting device according to claim 5, wherein the pre-pressing member is provided at an end of the first slider facing the second pressure sensor, the pre-pressing member is a magnetic member, and the second pressure sensor is a pressure sensor that is attracted by the magnetic member.
7. The pressure detection device according to claim 5, further comprising a bracket and a first sliding member, wherein the first sliding member is slidably connected to the bracket, a fixing portion is disposed at an end of the bracket away from the pressure receiving member, the first pressure sensor is located at an end of the first sliding member facing the pressure receiving member, the second pressure sensor is mounted at an end of the first sliding member facing the fixing portion, the first sliding member and the fixing portion are connected by magnetic attraction, and the pre-pressing member is disposed at an end of the fixing portion facing the second pressure sensor.
8. The pressure detecting apparatus according to claim 1, wherein a pressing member is further provided at an end of the pressure receiving member facing the first pressure sensor, the pressure receiving member bringing the pressing member into pressing contact with the first pressure sensor when being pressed.
9. The pressure detecting device according to any one of claims 1 to 8, further comprising a signal amplifying circuit and an analog-to-digital converting circuit, the signal amplifying circuit being electrically connected to the second pressure sensor and the controller, respectively, the analog-to-digital converting circuit being electrically connected to the signal amplifying circuit and the controller, respectively, the controller turning on or off the signal amplifying circuit and the analog-to-digital converting circuit in accordance with a detection signal of the first pressure sensor.
10. The smart pen is characterized by comprising a housing and the pressure detection device of any one of claims 1 to 9, wherein the pressure receiving member serves as a refill of the smart pen, and the housing is provided with a first chamber for accommodating the refill.
11. The smart pen of claim 10, wherein the controller is configured to determine a pen-up status and a pen-down status of the smart pen according to the detection signal of the first pressure sensor, and the controller is further configured to eliminate a zero offset of the second pressure sensor during writing of the smart pen according to a pressure value detected by the second pressure sensor during a last pen-up status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011133847.9A CN112148108A (en) | 2020-10-21 | 2020-10-21 | Pressure detection device and intelligent pen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011133847.9A CN112148108A (en) | 2020-10-21 | 2020-10-21 | Pressure detection device and intelligent pen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061588A (en) * | 2022-07-08 | 2022-09-16 | 深圳市学之友科技有限公司 | Dot matrix digital pen and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061588A (en) * | 2022-07-08 | 2022-09-16 | 深圳市学之友科技有限公司 | Dot matrix digital pen and manufacturing method thereof |
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