CN113639904A - A membrane sensor for stylus pen - Google Patents
A membrane sensor for stylus pen Download PDFInfo
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- CN113639904A CN113639904A CN202110888047.6A CN202110888047A CN113639904A CN 113639904 A CN113639904 A CN 113639904A CN 202110888047 A CN202110888047 A CN 202110888047A CN 113639904 A CN113639904 A CN 113639904A
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- 239000012528 membrane Substances 0.000 title claims description 57
- 230000005540 biological transmission Effects 0.000 claims abstract description 66
- 230000005489 elastic deformation Effects 0.000 claims abstract description 15
- 241001422033 Thestylus Species 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 12
- 230000004927 fusion Effects 0.000 description 7
- 238000004026 adhesive bonding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
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- Measuring Fluid Pressure (AREA)
Abstract
A diaphragm sensor for a touch pen comprises an elastic deformation element, a strain gauge, a force transmission piece, an outer cylinder and a central holding part; the strain gauge is arranged on the elastic deformation element, the geometric center of the lower surface of the elastic deformation element is vertically provided with a force transmission piece, and a central holding part is fixedly sleeved on the force transmission piece; the elastic deformation element and the outer edge of the central holding component are fixedly connected with the inner side wall of the outer cylinder. The pressure sensor assembly adopts a diaphragm force measuring structure, converts the pressure of the stylus pen head contacting a writing flat plate or a panel into resistance change or tiny voltage electric signals, outputs corresponding electric signals by detecting the strain magnitude of the strain gauge adhered on the diaphragm, can accurately detect the magnitude of the pressure F of the stylus pen head by the magnitude of the electric signals, and solves the problem of large output difference of the sensor caused by writing habits.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a diaphragm sensor for a touch pen.
Background
The touch pen is used as a handwriting input tool commonly provided for electronic equipment such as a tablet, a notebook computer, a mobile phone and the like, has similar functions to the traditional writing pen, is convenient to operate and is widely applied. In order to realize the function of writing and drawing, a force sensor is usually arranged in a touch pen, the pressure during writing and drawing is transmitted to the force sensor through a pen point, and handwriting and track reappearance is realized on a screen by combining a position, an algorithm and software, so that better experience is provided. Common force measuring sensors of touch pens have the principles of capacitance, inductance, magnetoelectricity, optics and the like, have different structures, and generally have the problems of insufficient force measuring precision, poor linearity, slow response speed, slow recovery speed and the like.
Except that the writing brush body is held perpendicularly when the writing brush dips in and gets the ink and write, people all hold the writing brush body and all be certain angle (the custom is about 30 ~ 90 °) with writing surface or panel when using other pens to write, the shape design of touch-control pen is close or unanimous with the gel pen that people were used to, the nib is circular or cone, the nib will write through with the panel, contact such as dull and stereotyped, the pressure transmission of drawing is for force cell sensor, the pressure conversion of writing is the distinguishable signal of telecommunication of circuit, realize handwriting, the orbit reappears. When using the touch control pen, people can hold the pen body without fixing a single position, and the axial line of the 360-degree arbitrary position of the circular pen body can form a certain angle with a writing surface or a panel, and even the phenomenon that the pen body continuously rotates in the writing process can occur. Certainly, the holding position can be fixed by designing the shape of the pen body, and a certain angle is kept unchanged, so that the user experience is reduced, and meanwhile, the manufacturing cost is increased. Due to the habits, the inclination angle, the holding position and the circumferential angle of the holding pen body are different, so that the output difference of the sensors for measuring the same writing pressure value is large, and the force sensors cannot meet the requirements especially in occasions with high requirements on measurement accuracy, linearity and response speed or when higher experience requirements are met. The frame resistance strain force transducer is influenced by principle and structure, and still cannot solve the problem of large output difference of the transducer under the conditions of the same writing pressure value, different inclination angles and different rotation angles.
Disclosure of Invention
The present invention is directed to a diaphragm sensor for a stylus pen to solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a diaphragm sensor for a touch pen comprises an elastic deformation element, a strain gauge, a force transmission piece, an outer cylinder and a central holding part; the strain gauge is arranged on the elastic deformation element, the geometric center of the lower surface of the elastic deformation element is vertically provided with a force transmission piece, and a central holding part is fixedly sleeved on the force transmission piece; the elastic deformation element and the outer edge of the central holding component are fixedly connected with the inner side wall of the outer cylinder.
Further, the elastic deformation element comprises a first diaphragm and a fixing piece; the fixing piece is in a cylindrical shape with two open ends, the first membrane covers one end of the fixing piece in a sealing mode, and the force transmission piece is in close contact with or connected with the geometric center of the first membrane.
Further, the fixing piece is a round cylinder or a rectangular cylinder; the wall thickness of the fixing part is 0.05 mm-0.6 mm, and the height is 3.0 mm-25.0 mm.
Furthermore, the end of the force transmission piece is tightly contacted or connected with the center of the first membrane; the force transmission piece is in surface contact, point contact or line contact with the first diaphragm; the force transmission piece and the fixing piece are arranged on the same surface of the elastic diaphragm deformation element.
Further, the central holding part is a sleeve, a corrugated pipe, elastic rubber or a second diaphragm; the thickness of the second membrane is less than or equal to that of the first membrane.
Furthermore, when the central holding component is a second membrane, a strain gauge is arranged on the second membrane, and the force transmission piece penetrates through the center of the second membrane and is vertically connected with the center of the first membrane.
Furthermore, the force transmission piece is a cylinder, and the diameter of the section of the cylinder is 0.5 mm-4.0 mm.
Furthermore, a pen point is fixedly arranged at the end part of the force transmission piece.
Compared with the prior art, the invention has the following technical effects:
the pressure sensor assembly of the invention adopts a diaphragm force measuring structure to convert the pressure of the stylus pen head contacting a writing flat plate or a panel into resistance change or a tiny voltage electric signal, and is mainly characterized in that: the pen point is connected with the pen point, the main shaft is fixed to move up and down along with the pressure of the pen point at a certain distance to drive the loading point to enable the diaphragm to generate uniform deformation, tensile stress and tensile strain are generated on the upper surface of the diaphragm in the circumferential direction, tensile stress and tensile strain are generated on the radial ray center of the diaphragm, and compressive stress and compressive strain are integrally generated on the edge of the diaphragm, so that a stable diaphragm deformation force-measuring loading structure is formed, and the pressure of the pen point is accurately reflected. When using, the diaphragm is fixed all around, and when the F power was used in on the diaphragm, the diaphragm can produce circumference and radial elastic deformation, and through the size of the strainometer size of meeting an emergency of pasting on the diaphragm in the detection, the corresponding signal of telecommunication of output just can accurate detection nib pressure F's size through the signal of telecommunication size, solves the big problem of sensor output difference that the custom of writing brought.
The central holding part can make the force transferring part move along the direction of the main shaft along with the pressure, the relative verticality and the coaxiality are kept fixed, and the force transferring is stable and uniform.
Drawings
FIG. 1 is a schematic diagram of the basic principle of the present invention;
FIG. 2 is a schematic structural diagram of a single-diaphragm sensor of a stylus according to the present invention;
FIG. 3 is a schematic view of the contact between a single diaphragm and a force-transmitting member according to the present invention;
FIG. 4 is a schematic view of the connection of the force-transmitting member to the component provided by the present invention;
FIG. 5 is a schematic view of the connection between the single membrane and the pen container provided by the invention;
FIG. 6 is a schematic structural diagram of a dual-diaphragm sensor according to the present invention;
FIG. 7 is a schematic view of the connection between the double membrane and the pen container provided by the invention;
FIG. 8 is a schematic view of a circular diaphragm structure;
fig. 9 is a schematic view of a rectangular diaphragm structure.
Description of reference numerals:
1-strain gauge; 2-a first membrane; 3, fixing parts; 4-force transmission piece; 5, an outer cylinder; 6-a second membrane;
7-a pen point; 8-central holding member.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the invention provides a novel force measuring structure sensor based on a resistance strain type principle. This pressure sensor subassembly adopts diaphragm dynamometry structure, and the pressure conversion who writes flat board or panel with the contact of stylus pen nib is resistance change or tiny voltage electricity signal, and the leading features is: the pen point is connected with the pen point, the main shaft is fixed to move up and down along with the pressure of the pen point at a certain distance to drive the loading point to enable the diaphragm to generate uniform deformation, tensile stress and tensile strain are generated on the upper surface of the diaphragm in the circumferential direction, tensile stress and tensile strain are generated on the radial ray center of the diaphragm, and compressive stress and compressive strain are integrally generated on the edge of the diaphragm, so that a stable diaphragm deformation force-measuring loading structure is formed, and the pressure of the pen point is accurately reflected.
The pressure sensor assembly at least comprises an elastic diaphragm deformation element, a strain gauge, a fixing element and a force transmission element. The elastic diaphragm deformation element forms a stress-strain concentration area when stressed, and the strain gauge is adhered to the strain concentration area of the elastic diaphragm deformation element; the fixing piece is used for fixing the elastic diaphragm deformation element; the force transmission piece accurately transmits the pressure transmitted by the pen point to the elastic diaphragm deformation element when the touch pen is used, so that the elastic diaphragm deformation element deforms.
The elastic diaphragm deformation element can be of a single diaphragm structure, is welded with the fixing piece and can be firmly bonded with the fixing piece through bonding glue, and the plane of the elastic diaphragm deformation element is perpendicular to the central main shaft of the fixing piece. When the elastic diaphragm deformation unit is a circular diaphragm, the fixing piece is a thin-wall circle or a cylinder, and the fixing piece form a deformation structure with the circular diaphragm as a closed end face. The elastic diaphragm deformation unit can also be a rectangular diaphragm, the fixing piece is a thin-wall rectangular frame or a rectangular barrel, and the elastic diaphragm deformation unit and the fixing piece form a deformation structure with the rectangular diaphragm as a closed end face.
When the elastic diaphragm deformation element is a circular diaphragm, the size is between 2.0mm and 15.0mm, the wall thickness is between 0.05mm and 0.6mm, and the height of the thin-wall circle or cylinder is between 3.0mm and 25.0 mm. When the elastic diaphragm deformation element is a rectangular diaphragm, the size is 2.0mm multiplied by 2.0mm to 15.0mm multiplied by 15.0mm, the wall thickness is 0.05mm to 0.6mm, and the height of the thin-wall rectangular frame or the rectangular barrel is 3.0mm to 25.0 mm.
The elastic diaphragm deformation element and the fixing piece can be integrally processed and formed, and the shape and the size are consistent with those of the elastic diaphragm deformation element and the fixing piece.
The pressure is transmitted to the elastic diaphragm deformation element by the pen point through the force transmission piece to cause deformation, the force transmission piece is a cylinder, the size of the section of the cylinder is phi 0.5 mm-4.0 mm, the end head of the cylinder is tightly contacted or connected with the center of the diaphragm of the elastic diaphragm deformation element in a point contact mode, a surface contact mode or a line contact mode, and the connection mode can be welded or bonded or screwed or nested with the center of the diaphragm or processed into a whole with the diaphragm. The force transmission piece and the fixing piece are arranged on the same surface of the elastic diaphragm deformation element.
In order to ensure that the axis of the force transmission piece keeps vertical and coaxial with the surface of the deformation element of the elastic diaphragm when the force transmission piece is stressed to move, a position is determined relative to the diaphragm in the cylindrical length direction of the force transmission piece, and a sleeve, a corrugated pipe, elastic rubber and the like are arranged, so that the force transmission piece can move along the main shaft direction along with pressure, the relative vertical degree and the coaxiality are kept fixed, and the force transmission is stable and uniform.
In order to further promote power transmission structure stability and reliability, carry out structural improvement with the pressure sensor subassembly, form two diaphragm structures, the main characteristics are: the force measuring device comprises two diaphragms which can be stressed and deformed, wherein the diameters or the lengths and the widths of the diaphragms are consistent, the two diaphragms are fixedly supported at the periphery simultaneously, a loading point is arranged at the center of the first diaphragm, a loading main shaft transmits force to the first diaphragm through the loading point, the loading main shaft penetrates through the center of the second diaphragm and is tightly connected with the second diaphragm, the main shaft is connected with a pen point, the main shaft is fixed to move up and down along with the pressure of the pen point at a certain distance and drives the first diaphragm and the second diaphragm to follow up to generate uniform deformation, the magnitude and the direction of stress strain of the first diaphragm and the second diaphragm are the same and are basically consistent with those of the single diaphragm, the absolute value of the stress strain is slightly smaller, and a more stable diaphragm deformation loading structure is formed.
The pressure sensor assembly at least comprises a first group of elastic diaphragm deformation elements, a second group of elastic diaphragm deformation elements, a strain gauge, a fixing element and a force transmission element. The elastic diaphragm deformation element forms a stress-strain concentration area when stressed, and the strain gauge is stuck to the strain concentration area of the elastic element, can be stuck to the surface of the first diaphragm, can be stuck to the surface of the second diaphragm, and can be stuck to the surfaces of the first diaphragm and the second diaphragm simultaneously; the fixing piece is used for fixing the elastic diaphragm deformation element; the force transmission piece accurately transmits the pressure transmitted by the pen point to the elastic diaphragm deformation element when the touch pen is used, so that the elastic diaphragm deformation element deforms.
The first diaphragm can be integrally processed and formed with the fixing piece, the second diaphragm is welded with the opening end of the fixing piece and can be firmly bonded with the opening end of the fixing piece through bonding glue, and the planes of the first diaphragm and the second diaphragm are perpendicular to the central axis of the fixing piece and are coaxial. When the elastic diaphragm deformation unit is a circular diaphragm, the fixing piece is a thin-wall circle or a cylinder, and the fixing piece form a deformation structure with the circular diaphragm as a closed end face. The elastic diaphragm deformation unit can also be a rectangular diaphragm, the fixing piece is a thin-wall rectangular frame or a rectangular barrel, and the elastic diaphragm deformation unit and the fixing piece form a deformation structure with the rectangular diaphragm as a closed end face.
The first membrane, the second membrane and the fixing piece are consistent with the size.
The first membrane, the second membrane and the fixing piece can be integrally processed and formed, and the shape and the size are consistent with those of the first membrane, the second membrane and the fixing piece.
Further, the force transfer member is shaped, dimensioned, contacted or connected in a manner and position etc. in accordance with the foregoing. The force transmission piece, the fixing piece and the second membrane are arranged on the same surface of the first membrane.
The force transmission piece penetrates through the center of the second elastic diaphragm deformation unit and is tightly connected with the second elastic diaphragm deformation unit in a welding mode, a bonding mode, an injection molding mode, a riveting mode, a thread fastening mode and the like, and the force transmission piece can be provided with a sleeve, and the sleeve is connected with the second diaphragm through the mode.
The force transmission piece is in central contact or connection with the second elastic diaphragm deformation unit and is consistent with the single elastic diaphragm deformation unit.
Furthermore, the two structures comprise elastic diaphragm deformation elements, the fixing pieces and the force transmission pieces, the elastic diaphragm deformation elements are combined to form a whole body as required, the fixing pieces are fixed with the pen container structure body, the fixing pieces are fixedly supported, force transmission movement of the force transmission pieces is facilitated, the elastic diaphragm deformation elements generate deformation, strain gauges sense deformation and output electric signals through a Wheatstone bridge, and the requirements of the touch control pen on performance and functions are met. The fixing piece and the pen container structure body can be fixed through welding, bonding, threaded connection, riveting and the like.
The strain of the elastic diaphragm deformation element in the strain gauge attaching area is controlled to be 50 mu epsilon-2000 mu epsilon.
Furthermore, the elastic diaphragm deformation element can be formed by punching and welding in a split mode.
Further, a pressure measurement sensor for a stylus is provided, a diaphragm pressure sensor assembly based on strain gauge principle.
The general description above, as well as the specific embodiments described below, include sensors of similar construction and are not intended to limit the scope of the claimed invention.
The principle of the invention is schematically shown in figure 1. When the pen nib pressure detection device is used, the periphery of the diaphragm is fixed, when the force F acts on the diaphragm, the diaphragm can generate circumferential and radial elastic deformation, the strain size of the strain gauge attached to the diaphragm is detected, a corresponding electric signal is output, and the pen nib pressure F can be accurately detected through the electric signal size.
According to the principle, the invention forms embodiment one. In one embodiment, the sensor for the stylus pen has a single diaphragm structure, and only one diaphragm of the sensor performs pressure sensing and deformation. The periphery of the first membrane 2 and the fixing piece 3 are fixed by laser fusion welding, and the fixing mode can also adopt other modes of fusion welding, glue joint and the like. The force transmission piece 4 penetrates through the component 8 to be tightly contacted or connected with the center of the first diaphragm 2, and the first scheme adopts circular arc point contact, surface contact and line contact, and can also adopt welded connection or adhesive connection or threaded connection or nested connection with the center of the diaphragm 2. The part 8 is arranged at a position opposite to the first membrane 2, the part 8 is used for keeping the force transmission part 4 to be coaxial with the center of the first membrane 2 when moving up and down, and the part 8 can be a sleeve, a corrugated pipe, elastic rubber and the like. When the force transmission piece 4 senses pressure, the up-and-down movement drives the first diaphragm 2 to deform, the deformation on the first diaphragm 2 is tested by the strain gauge, and the deformation is converted into a required electric signal through a circuit, so that the accurate sensing and measurement of the pressure of the pen point are realized. Embodiment a single-diaphragm sensor structure schematic diagram of realization is shown in fig. 2.
In the first embodiment, the first membrane 2 is a circular membrane, the fixing member 3 is a thin-walled circle or a cylinder structure, and the first membrane 2 and the fixing member 3 form a deformation structure with the circular membrane as a closed end face by laser fusion welding. The first membrane 2 can also adopt a rectangular membrane, the fixing piece 3 correspondingly adopts a thin-wall rectangular frame or a rectangular barrel, and the thin-wall rectangular frame or the rectangular barrel are welded to finally form a deformation structure with the rectangular membrane as a closed end face.
The first membrane 2 and the fixing member 3 may be integrally formed, and the shape and the size are consistent with the embodiment. The dimensions of the force transfer member 4 remain the same and will not be described in detail.
In the embodiment, the first membrane 2 and the force transmission piece 4 are in arc point contact, specifically, the contact end face of the force transmission piece 4 and the first membrane 2 is made into a spherical shape, the contact position of the first membrane 2 and the force transmission piece 4 is made into a spherical pit-shaped pit, and the two parts realize point contact and positioning. The contact between the first diaphragm 2 and the force-transmitting member 4 may also be surface contact, point contact or line contact as shown in fig. 3, but is not limited to the contact described in this patent, and the similar or similar contact is also within the scope of the present invention.
In order to keep the force-transmitting member 4 perpendicular and concentric with the center of the first membrane 2, in an embodiment, a member 8 is arranged at a position opposite to the first membrane 2, and the member 8 may be a sleeve, a bellows, an elastic rubber, etc., and may be deformed synchronously with the first membrane 2 or not affected by the deformation. Embodiment one part 8 adopts the muff coupling, and part 8 edge carries out laser butt fusion with mounting 3, forms the coaxial body with mounting 3, also can bond with gluing and fix, and of course, part 8 also can be directly fixed in the pen container, as long as keep keeping coaxial with mounting 3. The other connecting modes of the component 8 are fixed in a similar mode and method of the first embodiment. Several attachment means are schematically shown in fig. 4.
After the first diaphragm 2, the fixing member 3, the force transmission member 4, the component 8 and the like are assembled and connected, the touch control pen device is formed and is required to be connected with a pen container and the like to form a whole, and the structure of the single-diaphragm sensor and the pen container after being assembled is shown in detail in fig. 5. The structure comprises a strain gauge 1, a first diaphragm 2, a fixing part 3, a force transmission part 4, a pen container 5, a pen point 7 and a component 8. The strain gauge 1 is fixedly arranged on the upper surface of the first diaphragm 2 by means of pasting or other methods by a patch adhesive, the deformation of the first diaphragm 2 is sensed, the peripheral edge of the first diaphragm 2 is fixed with the fixing piece 3, and the edges of the first diaphragm and the fixing piece form a fixed support structure. For further fixing, the fixing member 3 is further fixed to the inner side wall of the pen container 5 by laser welding, and other fixing modes such as welding, gluing and the like can also be adopted. The nib 7 is located at the other end of the force-transmitting member 4, opposite the end of the force-transmitting member 4 contacting the first membrane 2. The force transmission piece 4 penetrates through the center of the component 8 and is perpendicular to the center of the first diaphragm 2 and in close contact with or connected with the center of the first diaphragm 2 to transmit the pressure of the pen point, so that the first diaphragm 2 is deformed, and the deformation of the first diaphragm 2 and the pressure of the pen point are basically linear through structural design and control. The force transmission element 4 can also be connected to the first membrane 2 by welding or gluing or screwing or nesting in the center of the membrane.
Compared with a single-chip structure, the double-diaphragm structure can further improve the stability and reliability of the sensor, and the stylus sensor with the double-diaphragm structure is invented, specifically see embodiment two provided by fig. 6. The basic structure of the sensor with the double-diaphragm structure is basically similar to that of the single-diaphragm structure, and the component 8 in the single-diaphragm structure is transformed into the second diaphragm 6 to be deformed synchronously or asynchronously with the first diaphragm 2. The second structure of the embodiment comprises a strain gauge 1, a first diaphragm 2, a force transmission piece 4, a pen container 5 and a second diaphragm 6. The strain gauge 1 is adhered or fixed on the upper surface of the first diaphragm 2 in other modes, the peripheral edges of the first diaphragm 2 and the second diaphragm 6 are fixed with the inner side wall of the pen container 5 to form a complete closed fixing and supporting structure, and the fixing mode can be fusion welding, adhesive bonding and the like. The force transmission piece 4 is tightly connected and coaxial through the center of the second diaphragm 6, is vertically and coaxially tightly contacted or connected with the center of the first diaphragm 2, and is connected in a manner similar to the single-diaphragm structure embodiment. Embodiment second diaphragm 6 is in accordance with the first diaphragm 2, and second diaphragm 6 may be of a lower thickness than first diaphragm 2, and second diaphragm 6 may also be in the form of a bellows diaphragm.
The first diaphragm 2 and the second diaphragm 6 in the second embodiment have a circular structure, and may have a rectangular shape. When the first diaphragm 2 and the second diaphragm 6 are circular diaphragms, the fixing parts 3 can also be used for fixing, and the fixing parts 3 are thin-wall circles or cylinders, so that the circular diaphragms are used as deformation structures of the closed end faces. The first membrane 2 and the second membrane 6 can also be rectangular membranes, and the fixing piece 3 is a thin-wall rectangular frame or a rectangular barrel, and the three form a deformation structure with the rectangular membranes as closed end faces.
In the second embodiment, the first diaphragm 2 and the second diaphragm 6 are the same as those of the first embodiment, and the shape, size, contact or connection mode and position of the force transmission member 4 are the same as those of the first embodiment, and thus the description thereof is omitted.
The sensor component with the double-diaphragm structure is formed after the first diaphragm 2, the second diaphragm 6, the force transmission piece 4, the pen container 5 and the like are assembled and connected, the touch control pen device is formed and is also required to be connected with the pen container and the like to form a whole, and the structural schematic diagram of the double-diaphragm sensor and the assembled pen container in the embodiment is shown in detail in fig. 7. The touch pen sensing part with the double-diaphragm structure comprises a strain gauge 1, a first diaphragm 2, a force transmission piece 4, a pen container 5, a second diaphragm 6 and a pen point 7. The strain gauge 1 is adhered to the first diaphragm 2, the peripheral edges of the first diaphragm 2 and the second diaphragm 6 are fixed with the inner side wall of the pen container 5 in a fusion welding mode, an adhesive bonding mode and the like. The pen point 7 is arranged at the other end of the force transmission piece 4, the force transmission piece 4 passes through the center of the second diaphragm 6 and is vertical to the center of the first diaphragm 2 and is in close contact with or connected with the center of the first diaphragm, and the basic structure and the connection mode are basically similar to the embodiment.
In order to further improve the reliability of the sensor with the dual-diaphragm structure and simplify the process and flow, the first diaphragm 2, the second diaphragm 6 and the fixing member 3 may be integrally formed in advance. When the force transmission piece 4 is used specifically, a through hole with a corresponding size is processed in the center of a certain diaphragm according to the size of the force transmission piece 4, so that the force transmission piece 4 can be in close contact with another diaphragm through the diaphragm, the edge of the through hole is connected with the force transmission piece 4 through fusion welding, and the two diaphragms and the main shaft are kept concentric and coaxial. When the sensor is manufactured, the strain gauges are arranged on the upper surfaces of the diaphragms without the through holes to sense deformation, and two groups of strain gauges can be arranged on the outer side surfaces of the two diaphragms through design to form strain difference test, so that the accuracy of the sensor is further improved. FIG. 8 is a schematic view of a circular diaphragm and a fully-closed one-step formed circular double-diaphragm structure.
The diaphragm can also be a rectangular or totally-enclosed one-step formed rectangular double-diaphragm structure, the forming and the method are similar to those of a round double-diaphragm structure and are not repeated, and the structure is schematically shown in FIG. 9.
Claims (8)
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| CN202110888047.6A CN113639904A (en) | 2021-08-03 | 2021-08-03 | A membrane sensor for stylus pen |
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| CN202110888047.6A CN113639904A (en) | 2021-08-03 | 2021-08-03 | A membrane sensor for stylus pen |
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| CN113639904A true CN113639904A (en) | 2021-11-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009714A (en) * | 2023-03-29 | 2023-04-25 | 荣耀终端有限公司 | Stylus, electronic equipment and pressure detection device |
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| CN109313093A (en) * | 2016-05-31 | 2019-02-05 | 微软技术许可有限责任公司 | For the force snesor used in stylus |
| CN107526453A (en) * | 2016-06-20 | 2017-12-29 | 群光电子股份有限公司 | Touch control pen |
| CN206399577U (en) * | 2017-01-10 | 2017-08-11 | 北京中航兴盛测控技术有限公司 | High-precision diaphragm pressure sensor |
| CN107636572A (en) * | 2017-06-26 | 2018-01-26 | 深圳市汇顶科技股份有限公司 | Pressure-detecting device and stylus |
| CN215893846U (en) * | 2021-08-03 | 2022-02-22 | 中航电测仪器股份有限公司 | Diaphragm sensor for touch control pen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009714A (en) * | 2023-03-29 | 2023-04-25 | 荣耀终端有限公司 | Stylus, electronic equipment and pressure detection device |
| CN116009714B (en) * | 2023-03-29 | 2023-08-01 | 荣耀终端有限公司 | Touch pen, electronic equipment and pressure detection device |
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