Writing device

Abstract

The utility model provides a writing device which can be prevented from being damaged due to overlarge pressure. The writing device comprises a shell, a refill module and a sensing module. The refill module is arranged on the shell and comprises a refill, a connecting piece, an overpressure protection piece and an abutting piece. The refill is detachably connected to the connecting piece, the abutting piece is movably connected to the connecting piece, the connecting piece and the abutting piece jointly form a cavity, and the overpressure protection piece is arranged in the cavity. The sensing module is arranged on the shell, and the abutting piece abuts against the sensing module. When the refill module bears external force larger than or equal to overload pressure, the connecting piece and the abutting piece move relatively, the length of the horizontal projection area of the cavity to the shell is changed, and the overpressure protection piece only transmits part of the external force to the sensing module so as to protect the sensing module.

Description

Technical Field

[0001] The utility model relates to a device, in particular to a writing device. Background Art

[0002] Current writing devices (such as styluses) include a refill and a pressure sensor. When the refill is subjected to force, it will displace and exert pressure on the pressure sensor to obtain a pressure sensing signal. When the external force applied to the refill is too large, the displacement of the refill is too large, resulting in too much pressure exerted by the refill on the pressure sensor, and the pressure sensor is easily damaged, causing the writing device to fail. Summary of the Utility Model

[0003] The utility model provides a writing device that can avoid being damaged due to excessive pressure.

[0004] A writing device of the utility model includes a housing, a refill module and a sensing module. The refill module is arranged in the housing. The refill module includes a refill, a connecting member, an overpressure protection member and an abutting member. The refill is detachably connected to the connecting member, the abutting member is movably connected to the connecting member, the connecting member and the abutting member jointly form a cavity, and the overpressure protection member is arranged in the cavity. The sensing module is arranged in the housing, and the abutting member abuts against the sensing module. When the refill module bears an external force greater than or equal to the overload pressure, the connecting member and the abutting member move relative to each other, so that the length of the horizontal projection area of the cavity on the housing changes, and the overpressure protection member only transmits part of the external force to the sensing module. When the refill module is not yet subjected to force, the length of the horizontal projection area of the cavity on the housing is the same as the length of the horizontal projection area of the cavity on the housing when the refill module bears a force less than the overload pressure.

[0005] Based on the above, when the refill module of the writing device of the utility model is subjected to an external force greater than or equal to the overload pressure, the overpressure protection member can bear part of the external force and only transmit part of the external force to the sensing module to protect the sensing module. Thus, the writing device can be avoided from being damaged due to excessive pressure.

[0006] To make the above features and advantages of the utility model more obvious and understandable, the following specific embodiments are given and described in detail in conjunction with the accompanying drawings. Description of the Drawings

[0007] Figure 1 is a schematic diagram of a writing device according to an embodiment of the utility model;

[0008] Figure 2 is a schematic diagram of a writing device according to another embodiment of the utility model;

[0009] Figure 3 is a schematic diagram of a writing device according to still another embodiment of the utility model. Detailed Description of the Embodiment

[0010] Figure 1 is a schematic diagram of a writing device according to an embodiment of the present utility model. Refer to Figure 1 , the writing device 100a includes a housing 110a, a refill module 120a, and a sensing module 130. The housing 110a includes an accommodation space 112 and an opening 116. The refill module 120a is partially disposed in the accommodation space 112 of the housing 110a. The refill module 120a includes a refill 121, a connecting member 122, an overpressure protection member 124a, and an abutting member 127. The refill 121, the connecting member 122, the overpressure protection member 124a, and the abutting member 127 are arranged along a moving axis L, and the connecting member 122, the overpressure protection member 124a, and the abutting member 127 are located in the accommodation space 112. The moving axis L is the central axis of the writing device 100a. The refill 121 is detachably connected to the connecting member 122 and is exposed from the housing 110a through the opening 116. The abutting member 127 is movably connected to the connecting member 122. The connecting member 122 and the abutting member 127 together form a cavity 123, and the overpressure protection member 124a is disposed in the cavity 123.

[0011] The sensing module 130 is disposed in the accommodation space 112 of the housing 110a. The sensing module 130 includes a pressure sensor 132 and a circuit board 134, and the pressure sensor 132 is connected to the circuit board 134. The abutting member 127 abuts against the pressure sensor 132 of the sensing module 130. When an external force F is applied to the refill module 120a, the refill module 120a moves along the moving axis L toward the sensing module 130 and presses the pressure sensor 132. The pressure sensor 132 is compressed to generate a signal, and the signal is transmitted to the circuit board 134. Figure 1 The external force F applied along the moving axis L is schematically shown, but the actual direction of the external force F is not limited to this embodiment.

[0012] In this embodiment, the connecting member 122 includes a first part P1 and a second part P2. The first part P1 is connected to the refill 121, a part of the first part P1 is located in the second part P2, and the cavity 123 is located in the second part P2. The abutting member 127 includes a head P3 and a neck P4, and the width of the head P3 is greater than the width of the neck P4. The head P3 extends into the connecting member 122. One end of the neck P4 is connected to the head P3, and the other end of the neck P4 passes through a hole 129 of the connecting member 122 and is exposed outside the connecting member 122 and abuts against the pressure sensor 132. The width of the hole 129 is smaller than the width of the head P3, so that the head P3 cannot exit the connecting member 122. A surface S1 of the first part P1 of the connecting member 122, a surface S2 of the head P3 of the abutting member 127, and an inner wall S3 of the second part P2 together form the cavity 123. The volume of the cavity 123 changes with the movement of the connecting member 122 relative to the abutting member 127. Figure 1Schematically shows the cavity 123 of the refill module 120a when not under force.

[0013] The overpressure protection member 124a includes a spring 125. When the refill module 120a is not under force, the spring 125 has a pre-pressure. In other words, the spring 125 is compressed within the cavity 123 when the refill module 120a is not under force. The spring 125 abuts against the first part P1 (connector 122) and the head P3 (abutment 127). The pre-pressure of the spring 125 is equal to an overload pressure. The overload pressure is less than the maximum detection force of the pressure sensor 132.

[0014] The writing device 100a of this embodiment is, for example, a stylus. The stylus can be forced to display a writing trace on a display device (e.g., a touchpad). The thickness of the writing trace of the stylus changes with the change of the external pressure. In other words, different thicknesses of the writing trace correspond to different pressure values. The pressure corresponding to the thickest writing trace is a full-scale pressure. The overload pressure can be equal to the full-scale pressure. For example, the maximum detection force of the pressure sensor 132 is, for example, 5 Newtons (N), and the full-scale pressure is, for example, 500 grams-force (gf). The overload pressure (i.e., the pre-pressure of the spring 125) is, for example, 500 grams-force, but is not limited thereto.

[0015] During the use of the writing device 100a, the width of the cavity 123 perpendicular to the movement axis L remains unchanged, and the change in the horizontal projection area of the cavity 123 on the housing 110a depends on the change in the length of the cavity 123 along the movement axis L (i.e., the length of the horizontal projection area). When the external force F applied to the refill module 120a is less than the pre-pressure of the spring 125 (i.e., the overload pressure), the external force F is not sufficient to resist the pre-pressure of the spring 125, so that the spring 125 will not deform due to the external force F, and the connector 122 and the abutment 127 do not move relative to each other, and the horizontal projection area of the cavity 123 on the housing 110a remains unchanged (meaning that the length of the cavity 123 along the movement axis L remains unchanged). It can be seen from this that the horizontal projection area of the cavity 123 of the refill module 120a when not under force is equal to the horizontal projection area of the cavity 123 of the refill module 120a when the external force F less than the overload pressure is applied. At this time, the entire refill module 120a is pushed by the external force F and moves along the movement axis L towards the sensing module 130, and the refill module 120a presses against the sensing module 130 to generate a pressure sensing signal.

[0016] When the refill module 120a is subjected to an external force F greater than or equal to the overload pressure, in addition to the external force F being able to push the refill module 120a (the abutting member 127) to move, the external force F can also resist the pre-pressure of the spring 125 and cause the spring 125 to deform. The external force F greater than or equal to the overload pressure includes two component forces. One component force is the deformation force absorbed by the spring 125 to cause the spring 125 to deform, and the other component force is the moving force used to move the refill module 120a (the abutting member 127). Specifically, a part of the external force F (i.e., the deformation force) pushes the connecting member 122, the connecting member 122 presses against the spring 125 and the pressure sensor 132 abuts against the abutting member 127, so that the spring 125 absorbs a part of the external force F (the deformation force) and deforms, the spring 125 is further compressed, and the connecting member 122 moves relative to the abutting member 127. Another part of the external force F (i.e., the moving force) pushes the abutting member 127 to move.

[0017] Since the magnitude of the force received by the component is positively correlated with the movement amount of the component, and the spring 125 (the overpressure protection member 124a) absorbs a part of the external force F (the deformation force), actually only another part of the external force F (the moving force) can be used to move the abutting member 127. The force (the moving force) actually received by the abutting member 127 is less than the external force F, and the movement amount of the abutting member 127 is reduced.

[0018] When the spring 125 deforms and the connecting member 122 and the abutting member 127 move relative to each other, the connecting member 122 moves along the movement axis L towards the abutting member 127, the surface S1 of the first part P1 approaches the surface S2 of the head P3, the length of the cavity 123 along the movement axis L changes, and the horizontal projection area of the cavity 123 on the housing 110a changes. The horizontal projection area of the cavity 123 on the housing 110a when the refill module 120a is not subjected to force is greater than the horizontal projection area of the cavity 123 on the housing 110a when the refill module 120a is subjected to an external force F greater than or equal to the overload pressure.

[0019] When the existing writing device without an overpressure protection member is subjected to an external force, the external force can directly push the refill module to pressurize the pressure sensor. Therefore, when subjected to an excessive external force, the movement amount of the refill module is too large, resulting in an excessive pressure applied by the refill module to the pressure sensor, and the pressure sensor is damaged. The existing writing device will set rubber for buffering, but the rubber will deform as soon as it is subjected to force (a large actuation stroke is required to reach the pressure level), and the rubber's response to pressure is relatively dull and cannot effectively absorb the instantaneous external force. Therefore, the rubber cannot effectively protect the sensing module.

[0020] Compared with a writing device without an overpressure protection component, when an external force F greater than or equal to the overload pressure is applied, the overpressure protection component 124a (spring 125) of the writing device 100a in this embodiment absorbs part of the external force F (deformation force), and the movement amount of the abutting member 127 decreases, and only part of the external force F (movement force) is transmitted to the sensing module 130 (pressure sensor 132). Thus, the effect of reducing the movement amount of the abutting member 127 to protect the sensing module 130 can be achieved. Since the movement amount of the abutting member 127 is reduced, the length of the housing 110a along the movement axis L can be reduced, thereby reducing the overall size of the writing device 100a.

[0021] The housing 110a further includes a retaining wall 114, and the refill module 120a further includes a protrusion 128. The retaining wall 114 is located on the movement path of the protrusion 128. When an external force F is applied to the refill module 120a, the protrusion 128 moves towards the retaining wall 114. When the external force F is too large (for example, much greater than the overload pressure), the retaining wall 114 can stop the protrusion 128 so that the refill module 120a cannot continue to apply pressure to the sensing module 130 (that is, the refill module 120a cannot move towards the sensing module 130), to prevent the sensing module 130 from being damaged due to excessive pressure.

[0022] When no external force F is applied, a distance B1 between the protrusion 128 and the retaining wall 114 is smaller than a length B2 of the cavity 123 along the movement axis L (that is, the distance between the surface S2 of the head P3 and the surface S1 of the first part P1). Specifically, the distance B1 is smaller than the maximum movement amount of the overpressure protection component 124a (that is, the maximum deformation amount of the spring 125).

[0023] The protrusion 128 of this embodiment is provided on the connecting member 122, but is not limited thereto. The protrusion 128 is connected to the first part P1 of the connecting member 122 (the protrusion 128 can also be provided on the second part P2), and the extending direction of the protrusion 128 is perpendicular to the movement axis L. The retaining wall 114 is located in the accommodating space 112 and extends towards the connecting member 122 in a direction perpendicular to the movement axis L. The retaining wall 114 is located on the movement path of the protrusion 128.

[0024] In addition, the writing device 100a further includes an elastic member 140. The elastic member 140 is, for example, a spring. The elastic member 140 is connected to the refill module 120a so that the refill module 120a abuts against the sensing module 130 when not under force, to avoid an idle stroke between the refill module 120a and the sensing module 130. The elastic member 140 of this embodiment can also be used to transmit the TX1 signal, but is not limited thereto.

[0025] Figure 2 It is a schematic diagram of a writing device according to another embodiment of the present invention. Please refer to Figure 1 and Figure 2, the writing device 100b of this embodiment is similar to the previous embodiment. The difference between the two is that the overpressure protection member 124b of the refill module 120b of this embodiment includes two magnetic members 126 with mutually repulsive magnetic polar faces. The convex portion 128 of the refill module 120b is provided on the second part P2 of the connecting member 122. One magnetic member 126 is provided on the first part P1 of the connecting member 122, and the other magnetic member 126 is provided on the head P3 of the abutting member 127.

[0026] When the refill module 120b is not under force, there is a magnetic repulsive force between the two magnetic members 126, and the magnetic repulsive force is equal to the overload pressure. The distance B1 is smaller than the length B2 of the cavity 123 and smaller than the maximum movement amount of the overpressure protection member 124b (i.e., a distance B3 between the two magnetic members 126). When the external force F applied to the refill module 120b is smaller than the magnetic repulsive force (overload pressure), the connecting member 122 does not move relative to the abutting member 127. When the external force F applied to the refill module 120b is greater than or equal to the magnetic repulsive force, at least part of the external force F counteracts the magnetic repulsive force to make the two magnetic members 126 approach each other, thereby reducing the horizontal projection area of the cavity 123 on the housing 110a. The writing device 100b of this embodiment has the same effect as the previous embodiment.

[0027] Figure 3 is a schematic diagram of a writing device according to still another embodiment of the present invention. Please also refer to Figure 1 and Figure 3 , the writing device 100c of this embodiment is similar to the previous embodiment. The difference between the two is that the convex portion 128 of the refill module 120c of this embodiment is provided on the refill 121 and moves along with the refill 121. The convex portion 128 is exposed from the opening 116 to the outside of the housing 110b. The retaining wall 114 surrounds the opening 116 of the housing 110b and faces the convex portion 128. The housing 110b is located on the movement path of the convex portion 128. Specifically, the retaining wall 114 is the surface of the housing 110b facing the convex portion 128, and the convex portion 128 and the retaining wall 114 are located outside the accommodation space 112. The convex portion 128 may be integrated with the refill 121, but is not limited thereto. The writing device 100c of this embodiment has the same effect as the previous embodiment.

[0028] Since the movement amount of the refill module 120c of the writing device 100c is reduced, the distance B1 between the convex portion 128 and the retaining wall 114 (the surface of the housing 110b) is shortened, and the refill 121 and the housing 110b can be arranged more compactly, thereby improving the aesthetics of the appearance of the writing device 100c. The user can set the overpressure protection members 124a, 124b, the convex portion 128, and the retaining wall 114 according to their needs.

[0029] In summary, when the pen core module of the writing device of the present utility model is subjected to an external force greater than or equal to the overload pressure, the overpressure protection member can bear part of the external force and only transmit part of the external force to the sensing module to protect the sensing module. Thus, the writing device can be prevented from being damaged due to excessive pressure.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A writing device, characterized in that: include: case; A refill module is arranged in the housing, the refill module comprises a refill, a connecting piece, an overpressure protection piece and an abutting piece, the refill is detachably connected to the connecting piece, the abutting piece is movably connected to the connecting piece, the connecting piece and the abutting piece jointly form a cavity, and the overpressure protection piece is arranged in the cavity; as well as A sensing module is disposed in the housing, and the abutting member abuts against the sensing module. When the core module is subjected to an external force greater than or equal to the overload pressure, the connecting member and the abutting member move relative to each other, thereby changing the length of the horizontal projection area of ​​the cavity on the shell, and the overpressure protection member only transmits part of the external force to the sensing module to protect the sensing module. When the core module is not subjected to force, the length of the horizontal projection area of ​​the cavity on the shell is the same as the length of the horizontal projection area of ​​the cavity on the shell when the core module is subjected to a force less than the overload pressure.

2. The writing device according to claim 1, characterized in that The sensing module includes a pressure sensor, the abutment member abuts against the pressure sensor, and the overload pressure is less than or equal to the maximum detection force of the pressure sensor.

3. The writing device according to claim 1, characterized in that The overpressure protection member comprises a spring. When the core module is not subjected to force, the spring has a pre-pressure, and the pre-pressure is equal to the overload pressure.

4. The writing device according to claim 1, characterized in that The overpressure protection component includes two magnetic components. When the core module is not subjected to force, there is a magnetic repulsion force between the two magnetic components, and the magnetic repulsion force is equal to the overload pressure.

5. The writing device according to claim 1, characterized in that The shell includes a retaining wall, the core module includes a protrusion, the retaining wall is located on the movement path of the protrusion, the core, the connecting piece, the overpressure protection piece and the abutment piece are arranged along the moving axis, the distance between the protrusion and the retaining wall is smaller than the length of the cavity along the moving axis, and the retaining wall is suitable for stopping the protrusion.

6. The writing device according to claim 5, characterized in that The shell includes a containing space, the sensing module and the retaining wall are located in the containing space, the core module is partially located in the containing space, the protrusion is arranged on the connecting piece, and the extending direction of the protrusion is perpendicular to the moving axis.

7. The writing device according to claim 5, characterized in that The shell comprises an opening, the convex part is arranged on the pen core and exposed to the shell from the opening, the retaining wall surrounds the opening and faces the convex part, and the shell is located on the action path of the convex part.

8. The writing device according to claim 1, characterized in that It also includes an elastic member, wherein the elastic member is connected to the core module so that the core module abuts against the sensing module when no force is applied.

9. The writing device according to claim 1, characterized in that The sensing module includes a pressure sensor and a circuit board. The pressure sensor is connected to the circuit board, and the abutting member abuts against the pressure sensor.

10. The writing device according to claim 1, characterized in that The connecting piece comprises a first part and a second part, the first part is connected to the pen core, and the cavity is located in the second part.

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