Membrane key capable of improving pressing feedback force

Abstract

The utility model discloses a film key capable of improving pressing feedback force, which relates to the technical field of film keys and comprises a key cap, an elastic sheet is arranged below the key cap, and the bottom of the elastic sheet is fixedly connected with an auxiliary plate; the elastic sheet comprises a connecting plate, the inner side of the connecting plate is provided with an arc-shaped sheet, and the arc-shaped sheet protrudes towards the direction of the key cap; the framework plays a role in supporting the thin film, and ensures that the contact is not attached to the terminal in an idle state; when the key cap is pressed, the thin film and the framework are pressed to move towards the arc-shaped sheet, so that the contact is contacted with the terminal on the arc-shaped sheet; at the moment, the pressing force received by the framework is transmitted to the arc-shaped piece, the arc-shaped piece moves towards the reset piece after receiving the pressing force, the arc-shaped piece protrudes towards the framework in the initial state, and jerking force can be generated due to the influence of the elastic force of the arc-shaped piece when the arc-shaped piece moves reversely under the action of the pressing force. A worker can clearly feel the jerking force generated by the arc-shaped sheet so as to know that the pressing operation on the film key is successful.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane keys, in particular to a membrane key for improving the pressing feedback force. Background Technique

[0002] A membrane key (Metal dome array) is a PET sheet with contacts (including a metal dome sheet also called a pot sheet), which is used as a switch on circuit boards such as PCBs and FPCs, and plays an important role as a tactile switch between users and instruments. Compared with traditional silicone keys, membrane keys have a better feel and a longer lifespan, and can indirectly improve the production efficiency of various types of switches using conductive films.

[0003] Chinese Patent Publication No. CN 209045415 U discloses a membrane key that can improve the pressing feel. The membrane key includes: a keycap, a spacer, and a dome sheet. The dome sheet is arranged in the middle of the spacer. The keycap includes: a substrate, a cap, a bump, and an upper circuit board. The cap is a hollow body that protrudes upward from the upper surface of the substrate. The bump protrudes downward from the lower surface of the cap. The bump is located in the middle of the cap. The upper circuit board is located on the lower surface of the bump. The cap covers the dome sheet, and the substrate is attached to the spacer. The dome sheet includes: a main body and a lower circuit board. The main body is a hollow body. The lower circuit board is located on the upper surface of the main body. The upper circuit board faces the lower circuit board.

[0004] For the above-mentioned membrane key, the dome sheet is used to increase the pressing feel of the membrane key. Although the dome sheet of the above-mentioned membrane key is arranged in an arc shape, the dome sheet is a solid integral structure. When pressing the membrane key, after the dome sheet receives a downward pressure, the pressure will be transmitted from the convex position in the middle of the dome sheet to the rest. And the arc has a strong compressive ability, so that the deformation effect of the dome sheet is weak, and a stress opposite to the direction of the pressure will be generated, thereby reducing the feedback force that the staff can feel when pressing the membrane key, making it impossible for the staff to clearly feel whether the membrane key can be used normally. Content of the Utility Model

[0005] The purpose of the utility model is to provide a membrane key for improving the pressing feedback force. The dome sheet is cross-shaped and arranged in an arc shape. When pressing the keycap, the dome sheet will deform when receiving the pressure, changing from protruding upward to protruding downward, and there will also be a sense of jerk during the deformation process, enabling the staff to clearly feel the feedback force generated by the dome sheet when pressing the keycap; to solve the technical problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A membrane key for improving the pressing feedback force includes a keycap, and a dome sheet is arranged below the keycap. The bottom of the dome sheet is fixedly connected to an auxiliary board.

[0008] The described elastic piece includes a connecting plate, and an arc-shaped piece is arranged on the inner side of the connecting plate, and the arc-shaped piece protrudes towards the keycap.

[0009] The described auxiliary plate includes a reset piece, the reset piece is located below the arc-shaped piece, and the middle of the top of the reset piece is attached to the middle of the bottom of the arc-shaped piece.

[0010] As a further technical solution of the present utility model, the keycap includes a thin film, and a skeleton is embedded in the middle of the thin film; the skeleton is arranged in an arc shape, and the thin film is also arranged in an arc shape under the support of the skeleton; the bottom of the skeleton is fixedly connected to the top of the connecting plate; a contact is installed in the middle of the bottom of the skeleton, and the contact extends below the thin film.

[0011] As a further technical solution of the present utility model, the connecting plate is in a circular ring shape; the arc-shaped piece is in a cross shape, and multiple ends of the arc-shaped piece are welded to the inner side of the connecting plate; a terminal is installed in the middle of the top of the arc-shaped piece, and the position of the terminal corresponds to the position of the contact.

[0012] As a further technical solution of the present utility model, the reset piece is in a cross shape, and the position of the reset piece corresponds to the position of the arc-shaped piece; each end of the reset piece is inclined, and the middle of the reset piece protrudes towards the arc-shaped piece.

[0013] As a further technical solution of the present utility model, multiple ends of the reset piece are welded to the inner side of the bottom plate, a circular through groove is arranged in the middle of the bottom plate, and the reset piece is located in the circular through groove of the bottom plate; the bottom of the connecting plate is welded to the top of the bottom plate.

[0014] As a further technical solution of the present utility model, a cross plate is welded to the inner bottom of the bottom plate, and the length of the cross plate is the same as the diameter of the middle through groove of the bottom plate; a limit seat is welded to the middle of the top of the cross plate, and the limit seat is located below the reset piece and corresponds to the protruding position of the reset piece.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] In the present utility model, the skeleton plays a role in supporting the thin film, keeping the thin film in a protruding state all the time, ensuring that the contact does not fit with the terminal in the idle state; when pressing the keycap, the thin film and the skeleton move towards the arc-shaped piece under pressure, making the contact contact with the terminal on the arc-shaped piece; at this time, the pressing force received by the skeleton is transmitted to the arc-shaped piece, and after the arc-shaped piece receives the pressure, it will move towards the reset piece. The initial state of the arc-shaped piece is protruding towards the skeleton. When moving in the reverse direction under the action of the pressing force, due to the influence of the elastic force of the arc-shaped piece itself, a jerky force will be generated, and the staff can clearly feel the jerky force generated by the arc-shaped piece, so as to know that the pressing operation on the thin film key is successful.

[0017] In the present utility model, during the deformation and movement of the arc-shaped piece, the reset piece will be driven to move synchronously. The reset piece plays a role in supporting the arc-shaped piece. Under the action of the pressing force, the arc-shaped piece deforms and bulges towards the direction of the reset piece. When the staff no longer presses the skeleton, the skeleton resets under the action of its own elastic force. Since the deformation degree of the arc-shaped piece is relatively large, it cannot reset itself. At this time, the elastic force generated by the reset piece can drive the arc-shaped piece to move towards the direction of the skeleton, so that the arc-shaped piece returns to its original state again. The limit seat plays a role in restricting the movement range of the reset piece, and further restricts the movement range of the arc-shaped piece, preventing the arc-shaped piece from being unable to be driven by the reset piece to recover due to excessive deformation. Description of the Drawings

[0018] Figure 1 is the three-dimensional structural schematic diagram of the present utility model.

[0019] Figure 2 is in the present utility model Figure 1 another perspective view.

[0020] Figure 3 is in the present utility model Figure 1 top view.

[0021] Figure 4 is in the present utility model Figure 3 A-A cross-sectional view.

[0022] Figure 5 is the three-dimensional structural schematic diagram of the keycap of the present utility model.

[0023] Figure 6 is in the present utility model Figure 5 internal structural schematic diagram.

[0024] Figure 7 is the three-dimensional structural schematic diagram of the elastic piece of the present utility model.

[0025] Figure 8 is in the present utility model Figure 7 side view.

[0026] Figure 9 is the three-dimensional structural schematic diagram of the auxiliary plate of the present utility model.

[0027] Figure 10 is in the present utility model Figure 9 bottom view.

[0028] In the figure: 1-keycap, 2-elastic piece, 3-auxiliary plate;

[0029] 11-film, 12-skeleton, 13-contact, 21-connecting plate, 22-arc-shaped piece, 23-terminal, 31-bottom plate, 32-reset piece, 33-horizontal plate, 34-limit seat. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] Please refer to Figure 1-10 , in the embodiment of the present invention, a membrane key for improving the pressing feedback force includes a keycap 1, a shrapnel 2 is arranged below the keycap 1, and the bottom of the shrapnel 2 is fixedly connected to an auxiliary plate 3;

[0032] The shrapnel 2 includes a connecting plate 21, and an arc-shaped piece 22 is arranged inside the connecting plate 21, and the arc-shaped piece 22 protrudes towards the keycap 1;

[0033] The auxiliary plate 3 includes a reset piece 32, the reset piece 32 is located below the arc-shaped piece 22, and the middle of the top of the reset piece 32 is attached to the middle of the bottom of the arc-shaped piece 22;

[0034] The keycap 1 includes a film 11, and a skeleton 12 is embedded in the middle of the film 11; the skeleton 12 is arc-shaped, and the film 11 is also arc-shaped under the support of the skeleton 12; the bottom of the skeleton 12 is fixedly connected to the top of the connecting plate 21; a contact 13 is installed in the middle of the bottom of the skeleton 12, and the contact 13 extends below the film 11;

[0035] The connecting plate 21 is circular; the arc-shaped piece 22 is cross-shaped, and multiple ends of the arc-shaped piece 22 are welded to the inner side of the connecting plate 21; a terminal 23 is installed in the middle of the top of the arc-shaped piece 22, and the position of the terminal 23 corresponds to the position of the contact 13;

[0036] By adopting the above technical solutions, the skeleton 12 plays a role in supporting the film 11, keeping the film 11 always in a convex state, ensuring that the contact 13 does not fit with the terminal 23 in the idle state; when pressing the keycap 1, the film 11 and the skeleton 12 move towards the arc-shaped piece 22 under pressure, so that the contact 13 contacts the terminal 23 on the arc-shaped piece 22; at this time, the pressing force received by the skeleton 12 is transmitted to the arc-shaped piece 22, and the arc-shaped piece 22 will move towards the reset piece 32 after receiving the pressure. The initial state of the arc-shaped piece 22 is convex towards the skeleton 12. When moving in the reverse direction under the action of the pressing force, a jerky force will be generated due to the influence of the elasticity of the arc-shaped piece 22 itself. The operator can clearly feel the jerky force generated by the arc-shaped piece 22, so as to know that the pressing operation on the membrane key is successful.

[0037] In this embodiment, the reset piece 32 is cross-shaped, and the position of the reset piece 32 corresponds to the position of the arc piece 22; each end of the reset piece 32 is inclined, and the middle of the reset piece 32 protrudes towards the arc piece 22;

[0038] Multiple ends of the reset piece 32 are welded to the inner side of the bottom plate 31. A circular through groove is provided in the middle of the bottom plate 31, and the reset piece 32 is located in the circular through groove of the bottom plate 31; the bottom of the connecting plate 21 is welded to the top of the bottom plate 31;

[0039] A cross plate 34 is welded to the inner bottom of the bottom plate 31. The length of the cross plate 34 is the same as the diameter of the middle through groove of the bottom plate 31; a limit seat 34 is welded to the middle of the top of the cross plate 34. The limit seat 34 is located below the reset piece 32 and corresponds to the protruding position of the reset piece 32;

[0040] By adopting the above technical solution, during the deformation and movement of the arc piece 22, the reset piece 32 will be driven to move synchronously. The reset piece 32 plays a role in supporting the arc piece 22. The arc piece 22 deforms under the action of the pressing force and protrudes towards the reset piece 32. When the staff no longer presses the skeleton 12, the skeleton 12 resets under its own elastic force. Since the arc piece 22 has a large deformation degree and cannot reset itself, the elastic force generated by the reset piece 32 can drive the arc piece 22 to move towards the skeleton 12, so that the arc piece 22 returns to its original state again; the limit seat 34 plays a role in restricting the movement range of the reset piece 32, and further restricts the movement range of the arc piece 22, preventing the arc piece 22 from being unable to be driven by the reset piece 32 to recover due to excessive deformation.

[0041] The working principle of the present utility model is: the skeleton 12 plays a role in supporting the thin film 11, keeping the thin film 11 always in a convex state, ensuring that the contact 13 does not contact the terminal 23 in the idle state; when pressing the key cap 1, the thin film 11 and the skeleton 12 receive pressure and move towards the arc piece 22, so that the contact 13 contacts the terminal 23 on the arc piece 22; at this time, the pressing force received by the skeleton 12 is transmitted to the arc piece 22. After receiving the pressure, the arc piece 22 will move towards the reset piece 32. The initial state of the arc piece 22 is convex towards the skeleton 12. When moving in the reverse direction under the action of the pressing force, a jerky force will be generated due to the influence of the elastic force of the arc piece 22 itself. The staff can clearly feel the jerky force generated by the arc piece 22, so as to know that the pressing operation on the membrane key is successful;

[0042] During the deformation movement of the arc-shaped piece 22, the reset piece 32 will be driven to move synchronously. The reset piece 32 plays a role in supporting the arc-shaped piece 22. Under the action of the pressing force, the arc-shaped piece 22 deforms to bulge towards the reset piece 32. When the staff no longer presses the skeleton 12, the skeleton 12 resets under the action of its own elastic force. Since the arc-shaped piece 22 has a large deformation degree and cannot reset itself, at this time, the elastic force generated by the reset piece 32 can drive the arc-shaped piece 22 to move towards the skeleton 12, so that the arc-shaped piece 22 returns to its original state again; the limit seat 34 plays a role in restricting the movement range of the reset piece 32, and further restricts the movement range of the arc-shaped piece 22, preventing the arc-shaped piece 22 from being unable to be driven by the reset piece 32 to recover due to excessive deformation.

[0043] In addition, it should be understood that although this specification is described according to the embodiments, not each embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A membrane key for improving pressing feedback strength, characterized in that: It comprises a key cap (1), a spring sheet (2) is provided below the key cap (1), and the bottom of the spring sheet (2) is fixedly connected to an auxiliary plate (3); The spring sheet (2) comprises a connecting plate (21), an arc-shaped sheet (22) is provided on the inner side of the connecting plate (21), and the arc-shaped sheet (22) protrudes in the direction of the key cap (1); The auxiliary plate (3) comprises a reset plate (32), the reset plate (32) being located below the arc-shaped plate (22), and the middle of the top of the reset plate (32) being in contact with the middle of the bottom of the arc-shaped plate (22).

2. The membrane key for improving the pressing feedback force according to claim 1, characterized in that: The keycap (1) comprises a film (11), wherein a frame (12) is embedded in the middle of the film (11); the frame (12) is arranged in an arc shape, and the film (11) is also arranged in an arc shape under the support of the frame (12); the bottom of the frame (12) is fixedly connected to the top of the connecting plate (21); a contact (13) is installed in the middle of the bottom of the frame (12), and the contact (13) extends to the bottom of the film (11).

3. The membrane key for improving the pressing feedback force according to claim 2, characterized in that: The connecting plate (21) is in the shape of a ring; the arc-shaped piece (22) is in the shape of a cross, and multiple ends of the arc-shaped piece (22) are welded to the inner side of the connecting plate (21); a terminal (23) is installed in the middle of the top of the arc-shaped piece (22), and the position of the terminal (23) corresponds to the position of the contact (13).

4. The membrane key for improving the pressing feedback force according to claim 3, characterized in that: The reset piece (32) is cross-shaped, and the position of the reset piece (32) corresponds to the position of the arc-shaped piece (22); each end of the reset piece (32) is inclined, and the middle of the reset piece (32) protrudes in the direction of the arc-shaped piece (22).

5. The membrane key for improving the pressing feedback force according to claim 4, characterized in that: The multiple ends of the reset sheet (32) are welded to the inner side of the bottom plate (31); a circular through groove is provided in the middle of the bottom plate (31); the reset sheet (32) is located in the circular through groove of the bottom plate (31); and the bottom of the connecting plate (21) is welded to the top of the bottom plate (31).

6. The membrane key for improving the pressing feedback force according to claim 5, characterized in that: A transverse plate (33) is welded to the inner bottom of the bottom plate (31), and the length of the transverse plate (33) is the same as the diameter of the middle through groove of the bottom plate (31); a limit seat (34) is welded to the middle of the top of the transverse plate (33), and the limit seat (34) is located below the reset plate (32) and corresponds to the protruding position of the reset plate (32).

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