An electromagnetic pen

Abstract

The invention discloses an electromagnetic pen, comprising a shell and a pen body located in the shell, the shell comprising a front shell and a rear shell, the pen body comprising a refill, a first iron core, an iron core cabin and a PCBA circuit board, a coil is wound around the first iron core, the first iron core is fixed to one end of the iron core cabin close to the tip of the refill, a second iron core is arranged in the iron core cabin, the refill passes through the center of the first iron core and then pushes the second iron core to move; an elastic structure is arranged between the PCBA circuit board and the iron core cabin, a card slot is arranged on the PCBA circuit board, and an end portion matched with the card slot is arranged on the rear shell. The invention adds an elastic structure between the iron core cabin of the front shell and the PCBA circuit board, and through the elastic margin of the elastic structure, the actual size of the electromagnetic pen when it leaves the factory is equal to the standard size, which is conducive to mass production, while reducing the probability of parts being damaged due to mechanical impact or wear, and extending the service life of the electromagnetic pen. The invention can be widely used in the field of information input equipment.

Description

Technical Field

[0001] The invention relates to the field of information input equipment, in particular to an electromagnetic pen. Background Art

[0002] With the rapid development of computer technology, various hardware devices are also changing with each passing day. Among input devices, in order to facilitate the needs of handwriting and drawing input, various handwriting and drawing input devices have emerged, including handwriting tablets, drawing tablets, etc., which can be collectively referred to as "drawing tablets".

[0003] Drawing boards can be technically divided into resistive, capacitive, electromagnetic, surface acoustic wave, optical (infrared), etc. Among them, the electromagnetic type is the most widely used and has been recognized by the market. Electromagnetic drawing boards are divided into active and passive types. Correspondingly, the electromagnetic pens contained in the electromagnetic drawing board system are also divided into active and passive types. The frequency change of the passive electromagnetic pen can be achieved through variable capacitance technology or variable inductance technology. In the electromagnetic drawing board system using the passive electromagnetic pen variable inductance technology, at the beginning, the changed inductance is connected in parallel with the capacitor on the PCBA, and the antenna board will emit a frequency to charge the pen; when the antenna board stops transmitting, the pen will change from receiving energy to transmitting energy. When the inductance on the pen changes, it is connected in parallel with the fixed capacitor on the PCBA, which will change the frequency of the pen transmission, so that the antenna board can obtain different pen frequencies and produce different pen pressure values ​​(reflecting the weight of writing).

[0004] The variable inductance technology of passive electromagnetic pens is mostly used in wound solenoids. The inductance value is changed by moving the iron core in the solenoid; or in two iron cores on the same axis, one is wound and the other is not wound, and the inductance value is changed by changing the distance between the two iron cores. The former has to be wound on the screw tube, so the pen diameter will be thicker than the latter; and the former, the coil is wound on the screw tube, which increases the distance between the coil and the iron core, making the energy loss of the former greater than the latter.

[0005] However, the electromagnetic pen with the structure of the two cores in a far-near relationship is composed of multiple parts, each of which has its own manufacturing error and is made of different materials, so there is often a problem of inconsistent size during assembly and production, resulting in the actual size of the electromagnetic pen being smaller or larger than the standard size when it leaves the factory, which is not conducive to mass production. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide an electromagnetic pen with good dimensional consistency.

[0007] The technical solution adopted by the present invention is: an electromagnetic pen, including a shell and a pen body located in the shell, the shell including a front shell and a rear shell, the pen body including a pen core, a first iron core, an iron core cabin and a PCBA circuit board, a coil is wound around the outside of the first iron core, the first iron core is fixed to one end of the iron core cabin close to the pen core tip, a second iron core is arranged in the iron core cabin, the pen core passes through the center of the first iron core and then pushes the second iron core to move; an elastic structure is arranged between the PCBA circuit board and the iron core cabin, a card slot is arranged on the PCBA circuit board, and an end portion matching the card slot is arranged on the rear shell.

[0008] Furthermore, a screw column is provided at the rear of the core cabin, a screw hole is provided on the PCBA circuit board, and the screw column is fixed to the screw hole by a screw.

[0009] Furthermore, a film sheet is provided between the first iron core and the second iron core.

[0010] Furthermore, a core clamp is provided in the core cabin, and the core clamp is located behind the second core.

[0011] Furthermore, the tail end of the pen core is provided with a step.

[0012] Furthermore, a first through hole is formed at the center of the first iron core, a second through hole is formed at the center of the second iron core, and a diameter of the first through hole is greater than a diameter of the second through hole.

[0013] Furthermore, the outer diameter of the first core is smaller than the outer diameter of the second core.

[0014] Furthermore, the elastic structure adopts a silicone ring.

[0015] Furthermore, the screw column is a cylinder, and the screw hole is an elliptical hole.

[0016] The beneficial effects of the present invention are as follows: the electromagnetic pen of the present invention has a card slot on the PCBA circuit board of the pen body, and an end portion matched with the card slot on the rear shell. When the front shell and the rear shell are combined, the rear shell pushes the pen body toward the front shell through the cooperation of the card slot and the end portion, so that the front shell and the rear shell can be closely fitted or connected; an elastic structure is added between the iron core cabin of the front shell and the PCBA circuit board, and the manufacturing errors of various parts of the axial direction from the pen tip to the pen tail of the pen core are eliminated through the elastic margin of the elastic structure, so that the actual size of the electromagnetic pen when leaving the factory is equal to the standard size, which is conducive to mass production. At the same time, the elastic structure can also play a buffering role, reduce the probability of parts being damaged due to mechanical impact or wear, and extend the service life of the electromagnetic pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the electromagnetic pen of the present invention;

[0018] Figure 2 It is a three-dimensional exploded view of the electromagnetic pen of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the PCBA circuit board of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure of the electromagnetic pen after the pen body of the present invention is assembled. DETAILED DESCRIPTION

[0021] The present invention will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments.

[0022] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 An electromagnetic pen comprises a shell and a pen body 7 located in the shell, wherein the shell comprises a front shell 8 and a rear shell 9, the pen body 7 comprises a refill 1, a first iron core 2, an iron core cabin and a PCBA circuit board, a coil 21 is wound around the outside of the first iron core 2, the first iron core 2 is fixed to one end of the iron core cabin close to the tip of the refill 1, a second iron core 42 is arranged in the iron core cabin, the refill 1 passes through the center of the first iron core 2 and thus pushes the second iron core 42 to move; an elastic structure 5 is arranged between the PCBA circuit board and the iron core cabin, a card slot 62 is arranged on the PCBA circuit board, and an end 91 matching the card slot 62 is arranged on the rear shell 9.

[0023] The prior art uses an electromagnetic pen with a structure of two cores with a distance relationship, generally adopting a structure in which the core without a winding coil is close to the tip of the pen; the tip of the pen presses against the core without a winding coil, and when the tip of the pen is subjected to force, the core without a winding coil is forced to approach the core with a winding coil, causing a change in inductance; but this structure often results in the distance between the two cores not being too far, so only an elastic element made of very thin elastic material can be placed. After long-term use, the elastic element will fatigue, causing the distance between the two cores to be out of control, and the electromagnetic pen will not work normally.

[0024] The electromagnetic pen of the present invention also uses the structure of the distance relationship between the two iron cores to cause the inductance change, but the difference in structure is that the iron core with the winding coil (i.e., the first iron core) is close to the tip of the pen, and the pen core passes through the center of the first iron core to push the iron core without the winding wire (i.e., the second iron core). This structure allows enough space behind the second iron core, and can be used to design the pen core clamp, internal elastic components and other structures, so that the pen tip has excellent force feedback performance. Moreover, compared with the variable inductance structure of the coil wound on the solenoid, the pen has a thinner diameter, so the pen appearance can be made thinner and more beautiful; the energy obtained by the pen is also greater than that of the structure wound on the solenoid; there is no overly thin elastic component, and the product life is good. In the present invention, when the second iron core is pushed, the inductance value on the winding coil will change, and the changed inductance is connected in parallel with the capacitor on the PCBA circuit board. The antenna board will emit a frequency to charge the pen. When the antenna board stops transmitting, the pen will change from receiving energy to transmitting energy, and the winding inductance on the pen will change and be connected in parallel with the fixed capacitor on the PCBA circuit board, which will change the frequency of the pen transmission, thereby enabling the antenna board to obtain different pen frequencies and produce different changes in pen pressure values.

[0025] The PCBA circuit board is electrically connected to the coil 21 to convert the changing inductance into the changing frequency, so that the antenna board can obtain different pen frequencies and generate different pen pressure values. Specifically, the PCBA circuit board is located behind the core cabin and can be fixedly connected to the core cabin by screws or the like.

[0026] like Figure 2 As shown, the first iron core 2 and the second iron core 42 of the present invention are both hollow structures, which can accommodate the pen core 1 to move axially inside; and the pen tip of the pen core 1 is on the left and the pen tail is on the right. Figure 2 As shown, the core cabin includes a front portion 41 and a bottom portion 44 that cooperate with each other. The first core 2 is fixed on the front portion 41 of the core cabin from the direction of the pen tip; and the second core 42 is installed in the core cabin from the direction of the pen tail; the first core 2 is fixed, and the second core 42 can be pushed by the pen core 1 in the core cabin. The bottom portion 44 can be combined with the front portion 41 in a rotatable manner to form the core cabin.

[0027] The card slot 62 is mainly used for fixing, and can realize the close fit or connection between the front shell and the rear shell. The card slot 62 is located in the middle and rear part of the PCBA circuit board (i.e., the rear end of the pen body 7), and can be snap-fitted with the end 91 of the rear shell 9. Figure 1 and Figure 3 As shown, when the front shell 8 and the rear shell 9 are combined, the end 91 of the rear shell 9 will be fixed by the card slot 62 through card connection, thereby pushing the entire pen body 7 toward the front shell 8.

[0028] The elastic structure 5 has a certain elastic margin, which is used to eliminate the error of absorbing the electromagnetic pen tip to the pen tail axis direction, so that the actual size of the electromagnetic pen is equal to the standard size when it leaves the factory. In addition, the elastic structure 5 can also play a buffering role to prevent the back shell and the iron core cabin and other parts from being damaged due to mechanical impact or wear, thereby extending the service life. The elastic structure 5 can be implemented by a rubber ring (such as a silicone ring), an elastic metal sheet, a film sheet and other elastic structures.

[0029] Reference Figure 2 and Figure 3 As a further preferred embodiment, a screw column 45 is provided at the rear of the core cabin, a screw hole 61 is provided on the PCBA circuit board, and the screw column 45 is fixed to the screw hole 61 by means of screws.

[0030] Reference Figure 2 As a further preferred embodiment, a film sheet 3 is further provided between the first core 2 and the second core 42 .

[0031] The first iron core 2 and the second iron core 42 of the present invention must maintain a fixed and accurate distance when the pen core 1 is not writing, so a film sheet 3 with a precise thickness is sandwiched between them to ensure the distance between the two iron cores.

[0032] Reference Figure 2 As a further preferred embodiment, a core clamp 43 is further provided in the core cabin, and the core clamp 43 is located behind the second core 42 .

[0033] The refill clamp 43 of the present invention is used for clamping the refill 1 .

[0034] Reference Figure 2 As a further preferred embodiment, a step 11 is provided at the tail end of the pen core 1 .

[0035] The step 11 is used to push the second iron core 42 .

[0036] Reference Figure 2 As a further preferred embodiment, a first through hole is opened at the center of the first iron core 2, a second through hole is opened at the center of the second iron core 42, and the diameter of the first through hole is larger than the diameter of the second through hole of the second iron core 42.

[0037] The first through hole of the first iron core 2 of the present invention has a larger diameter than the second through hole of the second iron core 42 , so that the pen core 1 can push the second iron core 42 through the step 11 at the rear end of the pen core 1 .

[0038] As a further preferred embodiment, the outer diameter of the first core is smaller than the outer diameter of the second core.

[0039] The outer diameter of the second iron core without winding wires of the present invention is larger than that of the first iron core with winding wires; the outer diameter of the second iron core decreases near one end of the first iron core, so that the overall appearance of the pen will not be abrupt due to the presence of the second iron core without winding wires inside, and the overall appearance consistency is better.

[0040] Reference Figure 1 and Figure 2 As a further preferred embodiment, the elastic structure 5 adopts a silicone ring.

[0041] As a further preferred embodiment, the screw column is a cylinder, and the screw hole is an elliptical hole.

[0042] The screw hole on the PCBA circuit board of the present invention is an elliptical hole, and the screw column of the core cockpit is a cylinder, so the PCBA circuit board can be moved a small distance toward the tip or tail of the pen after the screw is locked (the characteristic of the elliptical hole), which is convenient for position adjustment during installation and reduces installation errors.

[0043] The working principle of the electromagnetic pen of the present invention is as follows: when the pen core is subjected to force when writing, the pen core passes through the center of the first iron core and the center of the second iron core and is clamped by the pen core clamp, and the second iron core is pushed to move axially through the step at the tail end of the pen core, thereby forming different distances between the first iron core and the second iron core, so that the inductance value on the coil changes, and the changed inductance is connected in parallel with the fixed capacitor on the PCBA circuit board, thereby changing the frequency of the pen emission and generating different changes in the pen pressure value. In addition, a card slot is provided on the PCBA circuit board of the pen body of the present invention, and an end portion matched with the card slot is provided on the rear shell. Through the cooperation of the card slot and the end portion, when the front shell and the rear shell are combined, the rear shell pushes the pen body toward the front shell, so that the front shell and the rear shell can be tightly fitted or connected; an elastic structure is added between the iron core cabin of the front shell and the rear shell, and the elastic margin of the elastic structure is used to eliminate the manufacturing errors of various parts of the axial direction from the pen tip to the pen tail of the pen core, so that the actual size of the electromagnetic pen when leaving the factory is equal to the standard size, which is conducive to mass production and improves the production pass rate; at the same time, the elastic structure can also play a buffering role, reduce the probability of parts being damaged due to mechanical impact or wear, and extend the service life of the electromagnetic pen.

[0044] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An electromagnetic pen, characterized in that: The pen body comprises a shell and a pen body located in the shell, wherein the shell comprises a front shell and a rear shell, the pen body comprises a pen core, a first iron core, an iron core cabin and a PCBA circuit board, a coil is wound around the first iron core, the first iron core is fixed to one end of the iron core cabin close to the pen tip of the pen core, a second iron core is arranged in the iron core cabin, and the pen core passes through the center of the first iron core to drive the second iron core to move; An elastic structure is provided between the PCBA circuit board and the iron core cabin, and the elastic structure is used to eliminate and absorb the error of the electromagnetic pen tip toward the pen tail axis and reduce the damage of the rear shell and the iron core cabin caused by mechanical impact or wear. A card slot is provided on the PCBA circuit board, and an end portion matching the card slot is provided on the rear shell; A core fixture is also provided in the core cabin, and the core fixture is located behind the second core; The tail end of the pen core is provided with a step; The pen core passes through the center of the first iron core and the center of the second iron core and is clamped by the pen core clamp. The second iron core is pushed to move axially through the step at the tail end of the pen core, thereby forming different distances between the first iron core and the second iron core, so that the inductance value on the coil changes. The changed inductance is connected in parallel with the fixed capacitor on the PCBA circuit board, thereby changing the frequency of pen emission and producing different changes in pen pressure values.

2. The electromagnetic pen according to claim 1, characterized in that: A screw column is provided at the rear of the core cabin, a screw hole is provided on the PCBA circuit board, and the screw column is fixed on the screw hole by means of a screw.

3. The electromagnetic pen according to claim 1, characterized in that: A film sheet is also provided between the first iron core and the second iron core.

4. An electromagnetic pen according to any one of claims 1 to 3, characterized in that: A first through hole is formed at the center of the first iron core, a second through hole is formed at the center of the second iron core, and a diameter of the first through hole is greater than a diameter of the second through hole.

5. An electromagnetic pen according to any one of claims 1 to 3, characterized in that: An outer diameter of the first core is smaller than an outer diameter of the second core.

6. An electromagnetic pen according to any one of claims 1 to 3, characterized in that: The elastic structure adopts a rubber ring, an elastic metal sheet or a film sheet.

7. The electromagnetic pen according to claim 2, characterized in that: The screw column is a cylinder, and the screw hole is an elliptical hole.

Images