Intelligent pen

Abstract

The utility model provides an intelligent pen. The intelligent pen comprises a pen shell, a refill, a pen point, a pen point connecting shell, a pressure sensing conduction column, a camera sensor and a lens. One end of the cavity is connected with the pen point connecting shell through threads, and an installation channel is arranged in the pen point connecting shell to fix the elastic pen point. The pressure-sensitive conduction column is formed by three thin columns which are distributed in a circumferential array, one end of the pressure-sensitive conduction column is limited to the bayonet structure of the pen shell through a chuck, and the other end abuts against the refill; the surface of the thin column is provided with an arc groove and pasted with a strain gauge sensor. Three wide-angle lenses are evenly arranged on the circumference of the pen shell, and the central axes of the wide-angle lenses intersect at the center of the camera sensor. During writing, the pen point deforms to drive the refill to slightly move, the pressure sensing conduction column symmetrically disperses pressure and deforms, and the strain gauge outputs a pressure sensing signal; the three lenses synchronously collect handwriting, and blind areas are eliminated. Through cooperation of the pressure sensing conduction column structure and the multiple lenses, the problems of pressure sensing drift, weak interference resistance and unstable image acquisition of an existing intelligent pen are solved, the precision is remarkably improved, and the service life is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent pen technical field especially relates to a kind of intelligent pen based on pressure sensing conduction column structure and multi-lens collaborative image acquisition, it is specifically a kind of intelligent writing equipment that eliminates blind area by three lenses, and high-precision pressure sensing and stable handwriting collection are realized in combination with pressure sensing conduction column. BACKGROUND

[0002] With the rapid development of digital education and paperless office, intelligent writing equipment is widely used in electronic signature, online annotation, digital painting and other fields. The intelligent pen on the market currently adopts thin film pressure sensor in combination with single camera, and the tip and camera are respectively located on the two sides of the pen barrel. This design exposes significant defects in actual use: the sensitivity of thin film pressure sensor is easily affected by environmental factors such as temperature and humidity, signal drift is prone to occur after long-term use, and the anti-mechanical impact ability is poor, and drop or external force collision is prone to cause sensor failure or precision decline; single camera structure has collection blind area due to angle limitation, especially when writing obliquely or moving quickly, handwriting picture loss or track disconnection is prone to occur. SUMMARY

[0003] The utility model solves the technical problems that the existing intelligent pen is easily affected by use environment, has short service life, weak anti-interference ability and unstable handwriting picture collection, and provides a new type of intelligent pen. The intelligent pen adopts pressure sensing conduction column structure and camera sensor in combination with multi-lens image sensing structure through optimized structure design, which significantly improves the sensitivity, anti-interference ability and service life of the intelligent pen, and ensures the stability of handwriting picture collection.

[0004] The utility model discloses a technical scheme that solves its technical problem: a kind of intelligent pen, including pen shell, pen core, pen point, pen point connecting shell, pressure sensing conducting column, camera sensor and lens. Pen shell is equipped with cavity, and the inner wall of cavity is equipped with bayonet limiting structure, and the cavity is communicated with the opening of pen shell one end, and opening is provided with internal thread, and the circumferential direction of pen shell is evenly provided with three through holes, and the through hole is communicated with cavity, and the central axis of the three through holes meets with the central axis of pen shell in a point. Pen point is equipped with mounting hole, and the one end of mounting hole is communicated with the opening of pen point. Pen point connecting shell is equipped with installation channel, and installation channel both ends opening is communicated, and one end opening is equipped with external thread, and external thread is matched with the internal thread of pen shell and is connected. Pressure sensing conducting column is composed of three thin columns, and three thin columns are evenly circumferential array distribution, and one end of thin column is connected to connecting column body, and the other end is equipped with clamp respectively, and clamp is clamped with the bayonet limiting structure of pen shell. Camera sensor is arranged in the cavity of pen shell and is coaxial with the central axis of pen shell, and the intersection point of the geometric plane center point of camera sensor and the central axis of three through holes on pen shell coincides. Pen core is arranged in the mounting hole of pen point, and one end of pen core passes through the opening of pen point. Lens is fixed in the through hole of pen shell, and the central axis of lens passes through the geometric plane center point of camera sensor.

[0005] Further, the lens is fixed in the through hole by thread or buckle.

[0006] Further, one end of the pen point is inserted into the installation channel of the pen point connecting shell, and the opening end of the pen point is aligned with the other end opening of the installation channel of the pen point connecting shell.

[0007] Further, the surface of the thin column of the pressure sensing conducting column is provided with a circular arc groove, and the depth of the circular arc groove is 0.5mm.

[0008] Further, one end of the three thin columns of the pressure sensing conducting column is commonly connected to a conducting column connecting column body, and a circular arc groove is provided on the thin column body.

[0009] Further, the concave surface of the circular arc groove is pasted with a strain gauge sensor, and the strain gauge sensor is connected with a circuit board through a lead wire.

[0010] Further, one end of the pen core close to the cavity abuts against the connecting column body of the pressure sensing conducting column, and the axial displacement of the pen core drives the pressure sensing conducting column to deform.

[0011] Further, the light-sensitive surface of the camera sensor faces the through hole.

[0012] The utility model discloses an advantageous effect is: the utility model discloses through optimizing the structure design of intelligent pen, adopts the image sensing structure of pressure sensing conducting column structure and camera sensor and multi -lens cooperation, the sensitivity, anti -interference ability and service life of intelligent pen are improved obviously, ensure the stability of handwriting picture collection. Specifically, pressure sensing conducting column structure is evenly distributed through three thin columns, effective conduction pressure, reduce environmental disturbance, improve the pressure sensing accuracy;The image sensing structure of camera sensor and multi -lens cooperation is evenly set through three lenses, eliminates the collection blind area, ensures the integrity and stability of handwriting picture collection. In addition, the compact structure of intelligent pen, easy installation, long service life, be applicable to various writing and drawing scene, have extensive application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structure schematic diagram of the utility model;

[0014] Figure 2 It is the partial structure schematic diagram of the utility model;

[0015] Figure 3 It is the front view of the utility model;

[0016] Figure 4 It is the bottom view of the utility model;

[0017] Figure 5 It is the top view of the utility model;

[0018] All the drawings, same drawing mark explains: lens 1, pen nib connecting shell 2, pen nib 3, pen core 4, pen shell 5, pressure sensing conducting column 6, strain gauge 7, circuit board 8, camera sensor 9, connecting column body 10, arc recess 11, chuck 12, bayonet limit structure 13, through -hole 14. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is further detailed to the utility model with the drawings and examples. It should be understood that the specific examples described here are only for explaining the utility model, and are not used to limit the protection scope of the utility model.

[0020] The structure of intelligent pen is as shown in Figures 1 to 5 Including pen shell 5, pen nib connecting shell 2, pen nib 3, pen core 4, pressure sensing conducting column 6, camera sensor 9, strain gauge sensor 7, three lenses 1, and each component cooperates and realizes pressure sensing and multi -view image collection function.

[0021] The pen shell 5 is made of high-strength ABS material and is injection molded. The pen shell has a cavity inside, which is in communication with the opening at one end of the pen shell. The opening is provided with internal threads for matching and connecting with the external threads of the pen tip connecting shell 2. The inner wall of the cavity is provided with a bayonet limiting structure 13 for clamping and fixing the clamping head 12 of the sensing and conducting column 6. The pen shell 5 is uniformly provided with three through holes 14 in the circumferential direction. The central axes of the through holes 14 intersect with the central axis of the pen barrel at the geometric center of the camera sensor 9, ensuring that the light path of the lens 1 converges accurately on the camera sensor.

[0022] The pen tip 3 is made of elastic plastic material (such as thermoplastic polyurethane TPU) and has an installation hole inside for fixing the pen core 4. The front end of the pen tip 3 extends out of the pen core 4 by about 2mm, and the rear end is inserted into the installation channel of the pen tip connecting shell 2 through interference fit, and the opening end face is flush with the opening at one end of the installation channel (including internal threads) of the pen tip connecting shell 2.

[0023] The pen tip connecting shell 2 is made of hard plastic material (such as polycarbonate PC) and has a through installation channel inside. One end is connected to the pen shell 5 through external threads, and the other end is fixed to the pen tip 3 through adhesive.

[0024] The pressure sensing and conducting column 6 is composed of three nickel-titanium alloy thin columns arranged in a 120° circumferential array (spring steel material can also be selected). One end of the thin column is fixed to the connecting column 10 by laser welding, and the other end is provided with a clamping head 12. In order to generate a larger deformation (improve the detection accuracy of the strain gauge sensor), the surface of the thin column is processed with a circular arc groove 11 with a depth of 0.5mm. The strain gauge sensor 7 is pasted on one side of the circular arc groove 11 of the pressure sensing and conducting column 6.

[0025] The camera sensor 9 selects a 5 million pixel CMOS module. The geometric center point of the camera sensor 9 coincides with the intersection of the central axes of the three through holes 14, ensuring synchronous collection of multi-view images.

[0026] Assembly of the pen tip connecting shell and the pen shell. The installation channel of the pen tip connecting shell 2 is screwed into the opening of the cavity of the pen shell 5 through external threads until the opening end faces of the two are flush. The pen tip 3 is inserted into the installation channel of the pen tip connecting shell 2 through interference fit, and epoxy resin glue is applied to the connection part to enhance the fixation. The pen core 4 is inserted into the installation hole of the pen tip 3, and the front end extends out of the pen tip opening by about 2mm, and the rear end abuts against the end face of the connecting column 10 of the pressure sensing and conducting column 6.

[0027] Installation of the pressure sensing and conducting column. Align the clamping head 12 of the pressure sensing and conducting column 6 with the bayonet limiting structure 13 in the cavity of the pen shell 5, and apply axial pressure to make it clamped into the limiting groove, ensuring that the pressure sensing and conducting column 6 is coaxial with the pen core 4. The strain gauge sensor 7 is made of a metal foil strain gauge and is pasted on one side of the circular arc groove 11 of the pressure sensing and conducting column 6 through epoxy resin glue, and is connected to the circuit board 8 through a flexible printed circuit (FPC) lead.

[0028] Camera and lens configuration. The camera sensor 9 is fixed in the cavity of the pen shell 5, with its photosensitive surface facing the opening direction of the pen shell and coplanar with the optical axes of the three lenses 1. The three lenses 1 are screwed into the through hole 14 of the pen shell 5 (or can be fixed by clamping), and the lenses are selected as 120° wide-angle lenses, with their optical axes converging at the center of the photosensitive surface of the camera sensor 9, forming a three-view angle acquisition system with no blind area.

[0029] Circuit integration. The circuit board 8 integrates a signal amplification module, an AD converter, and a Bluetooth 5.0 communication module, converts the analog signal of the strain gauge sensor 7 into 4096-level digital pressure data, and transmits it to an external device in real time.

[0030] Pressure sensing and conducting mechanism working principle. During writing, the elastic pen tip 3 is deformed under pressure, pushing the pen core 4 to move slightly (displacement of about 0.1-0.3mm) into the pen shell 5, and the rear end of the pen core 4 presses against the connecting column 10 of the pressure sensing and conducting column 6. The three thin columns symmetrically disperse the pressure and produce elastic deformation, and the strain gauge sensor 7 pasted on one side of the circular arc groove 11 of the pressure sensing and conducting column 6 detects the deformation, outputting an electric signal proportional to the pressure.

[0031] Image acquisition mechanism working principle. The three lenses 1 synchronously capture the contact area between the pen tip 3 and the writing surface, and the camera sensor 9 eliminates the blind area through multi-frame image fusion algorithm, and restores the handwriting trajectory combined with the pressure data. The camera sampling frequency is 120Hz, ensuring smooth dynamic writing; the lens coating layer can reduce glare interference.

[0032] Anti-interference design working principle. The three-column symmetric structure of the pressure sensing and conducting column 6 suppresses lateral force interference; the high elastic modulus of the nickel-titanium alloy material reduces the influence of temperature and humidity on precision. The stiffness gradient formed by the hard PC material of the pen tip connecting shell 2 and the elastic TPU material of the pen tip 3 further buffers impact and vibration.

[0033] As an optimization scheme, the following improvements are added based on the first embodiment:

[0034] Buffer structure. A 0.5mm thick silicone buffer pad is added between the rear end of the pen core 4 and the connecting column 10 of the pressure sensing and conducting column 6, reducing the damage to the sensor caused by drop impact.

[0035] Replaceable lens. The lens 1 adopts a clamping type detachable design, and users can replace different focal lengths (such as 60° standard lens or 150° ultra-wide-angle lens) according to their needs.

[0036] Dual-material pressure sensing and conducting column. The connecting column 10 of the pressure sensing and conducting column 6 is made of spring steel, and the thin column part is made of nickel-titanium alloy, connected by riveting process, balancing strength and sensitivity.

[0037] The above embodiments are only preferred embodiments of the present application, and those skilled in the art can adjust the material (such as the carbon fiber composite material used for the pen shell), the size (such as the pen core extension length adjustment range of 1-3mm) or the circuit configuration (such as the increase of the pressure calibration module) within the range defined by the claims, and such variations all fall within the protection scope of the present application.

Claims

1. A smart pen, characterized by The utility model relates to a kind of intelligent pen, including: Pen shell (5), the pen shell (5) is equipped with cavity inside, the inner wall of the cavity is equipped with bayonet limiting structure (13), the cavity is open with pen shell (5) one end intercommunication, the opening is provided with internal thread;The circumferential direction of the pen shell (5) is evenly provided with three through holes (14), the through hole (14) is communicated with cavity, and the central axis of the three through holes (14) and the central axis of pen shell (5) meet at a point; Pen point (3), the pen point (3) is equipped with mounting hole inside, the one end of the mounting hole is communicated with the opening of pen point; Pen point connecting shell (2), the pen point connecting shell (2) is equipped with installation channel inside, the installation channel both ends open intercommunication, one end opening is equipped with external thread, the external thread is matched with the internal thread of the pen shell (5) and is connected; Pressure sensing conducting column (6), the pressure sensing conducting column (6) is composed of three thin columns, the three thin columns are evenly circumferential array distribution, one end of the thin column is connected to connecting column body (10) in common, the other end is equipped with clamp (12) respectively, the clamp (12) is clamped with the bayonet limiting structure (13) of the pen shell (5); Camera sensor (9), the camera sensor (9) is set in the cavity and is coaxial with the central axis of the pen shell (5), the intersection point of the geometric plane center point of the camera sensor (9) and the central axis of the three through holes (14) coincides; Pen core (4), the pen core (4) is equipped in the mounting hole of the pen point, one end of the pen core (4) passes through the opening of the pen point (3); Lens (1), the lens (1) is fixed in the through hole (14) of the pen shell (5), and the central axis of the lens (1) passes through the geometric plane center point of the camera sensor (9).

2. The smart pen of claim 1, wherein: The lens (1) is fixed in the through hole (14) by thread or buckle.

3. The intelligent pen of claim 1, wherein: one end of the pen point (3) is inserted into the installation channel of the pen point connecting shell (2), and the opening end of the pen point (3) is aligned with the other end opening of the installation channel of the pen point connecting shell (2).

4. The intelligent pen of claim 1, wherein: the surface of the thin column of the pressure sensing conducting column (6) is provided with a circular-arc groove (11), and the depth of the circular-arc groove (11) is 0.5 mm.

5. The intelligent pen of claim 4, wherein: the concave surface of the circular-arc groove (11) is pasted with a strain gauge sensor (7), and the strain gauge sensor (7) is connected with a circuit board (8) through a lead wire.

6. The intelligent pen of claim 1, wherein: one end of the pen core (4) close to the cavity is in abutment with the connecting column body (10) of the pressure sensing conducting column (6), and the axial displacement of the pen core (4) drives the deformation of the pressure sensing conducting column (6).

7. The intelligent pen of claim 1, wherein: the light-sensitive surface of the camera sensor (9) faces the through hole (14).

Images