Key structure and printer

Abstract

The utility model discloses a button structure and a printer. The button structure comprises a housing, a circuit board, a trigger switch, a cantilever and a pressing part. The circuit board is arranged on the shell; the trigger switch is arranged on the circuit board; one end of the cantilever is connected with the casing, and the other end is arranged on one side of the circuit board provided with the trigger switch at intervals and is provided with a pressing end face close to the trigger switch; the pressing part comprises a trigger bone and a limiting bone which are arranged on the pressing end face, the trigger bone can abut against the trigger switch when the pressing end is pressed, the limiting bone falls out of the trigger switch when the trigger bone abuts against the trigger switch, and the distance between the limiting bone and the circuit board is smaller than or equal to 0.2 mm. According to the scheme, the trigger switch can be prevented from being damaged due to the fact that the borne load exceeds the limit, the service life of the key structure is prolonged, the structure is simple, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of printer buttons, in particular to a button structure and a printer. Background Art

[0002] Keys are a common and important component of digital products. As digital products become increasingly popular, the demand for lightweight design is increasing, leaving less and less space for keys. Patent CN 218497975 U discloses a cantilevered key and its terminal device. Both the cantilever and the key have a certain degree of elasticity, and the two are fixedly connected by a snap-fit ​​mechanism. The cantilever is limited in the upper and lower directions by the first and second steps of a three-pronged structure, respectively, ensuring a secure connection and preventing the key from falling off.

[0003] However, when the user applies too much pressure, the pressure column on the press key in the patent directly presses against the trigger switch on the PCB (circuit board), which can easily cause the trigger switch to be damaged due to the load exceeding its working limit. Utility Model Content

[0004] The purpose of the present utility model is to overcome the above-mentioned technical deficiencies and to propose a key structure and a printer to solve the technical problem in the prior art that when the pressing force applied by the user is too large, the pressure column on the press key directly presses against the trigger switch, which easily causes the trigger switch to be damaged due to the load exceeding its working limit.

[0005] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a key structure, comprising:

[0007] chassis;

[0008] a circuit board, disposed in the housing;

[0009] a trigger switch, provided on the circuit board;

[0010] a cantilever, one end of which is connected to the housing, the other end of which is spaced apart from the side of the circuit board where the trigger switch is provided, and has a pressing end surface close to the trigger switch; and

[0011] The pressing portion includes a trigger bone and a limiting bone provided on the pressing end surface. The trigger bone can press against the trigger switch when the cantilever is pressed. The limiting bone falls outside the trigger switch when the trigger bone presses against the trigger switch, and the distance between the limiting bone and the circuit board is less than or equal to 0.2 mm.

[0012] In some embodiments, there are multiple limiting bones, and the multiple limiting bones are spaced and arranged around the trigger bone.

[0013] In some embodiments, the trigger bone includes two trigger ribs, one end of the two trigger ribs is connected to the pressing end surface, and the middle parts of the two are connected and cross-arranged.

[0014] In some embodiments, the limiting bone includes a limiting rib plate and a limiting rib bar, the limiting rib plate is connected to the pressing end surface, and one side faces the trigger bone, and the limiting rib bar is connected to the pressing end surface and connected to the side of the limiting rib plate away from the trigger bone.

[0015] In some embodiments, the cantilever includes a pressing plate and a plurality of arm bodies, wherein the plurality of arm bodies are spaced apart and arranged around the periphery of the trigger switch, and each arm body has a connecting end and a hanging end at both ends, wherein the connecting end is connected to the housing, and the hanging end is suspended on a side of the circuit board where the trigger switch is provided and is opposite to the trigger switch, and the pressing plate is connected to the plurality of hanging ends;

[0016] Wherein, the pressing end surface is formed on a side of the pressing plate close to the trigger switch.

[0017] In some embodiments, the arm is arranged in an arc shape and gradually moves away from the pressing plate from the suspension end to the connection end.

[0018] In some embodiments, the arm body further includes an elastic segment located between the connecting end and the suspension end, the connecting end, the elastic segment and the suspension end are connected in sequence, and the size of the connecting end and the suspension end is larger than the size of the elastic segment.

[0019] In some embodiments, the housing has a mounting opening communicating with the inner cavity thereof, the circuit board is mounted in the inner cavity of the housing, and the trigger switch is located on a side of the circuit board close to the mounting opening and facing the mounting opening;

[0020] The button structure also includes a mounting frame, which is detachably mounted on the inner wall of the casing and is arranged around the mounting opening. The multiple connection ends are respectively connected to the mounting frame and are located in the same horizontal plane. The end of the pressing plate away from the trigger switch extends out of the inner cavity of the casing from the mounting opening.

[0021] In some embodiments, a mounting groove is provided on an end surface of the pressing plate away from the trigger switch, and the cantilever further includes a pressing flexible pad, which is placed in the mounting groove.

[0022] In a second aspect, the present invention further provides a printer comprising a key structure as described in any one of the above items.

[0023] Compared to the prior art, the key structure provided by the present invention forces the trigger bone, also provided with the pressing end surface, to approach and press against the trigger switch when the user presses the end of the cantilever with the pressing end surface. Because the spacing between the stop bone and the circuit board is less than or equal to 0.2 mm when the trigger bone is just pressing against the trigger switch, if the user applies excessive pressure, the trigger bone will continue to press the trigger switch downward by up to 0.2 mm. The stop bone will then press against the circuit board, preventing the trigger bone from further pressing the trigger switch, thus preventing damage to the trigger switch due to excessive load. This extends the service life of the key structure, and the structure is simple and cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a key structure provided by an embodiment of the present utility model;

[0025] Figure 2 yes Figure 1 A partial cross-sectional view of the middle button structure;

[0026] Figure 3 yes Figure 2 Exploded view of the middle circuit board, trigger switch, cantilever, and pressing part;

[0027] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle circuit board, trigger switch, cantilever and pressing part;

[0028] Figure 5 yes Figure 4 A cross-sectional view of the middle circuit board, trigger switch, cantilever, and pressing portion;

[0029] Figure 6 yes Figure 4 Schematic diagram of the circuit board and trigger switch;

[0030] Figure 7 yes Figure 4 Schematic diagram of the structure of the middle cantilever and pressing part;

[0031] Figure 8 yes Figure 7 Schematic diagram of the middle cantilever and pressing part from another angle;

[0032] Figure 9 yes Figure 1 Schematic diagram of the mid-case;

[0033] Figure 10 yes Figure 8 The middle cantilever is not shown as a schematic diagram of pressing the flexible pad.

[0034] Description of reference numerals:

[0035] 1. Casing; 1a. Mounting port; 2. Circuit board; 3. Trigger switch; 4. Cantilever; 41. Pressing end face; 42. Pressing plate; 42a. Mounting slot; 43. Arm body; 431. Connecting end; 432. Suspension end; 433. Elastic section; 44. Pressing flexible pad; 5. Pressing portion; 51. Trigger bone; 511. Trigger rib; 52. Limiting bone; 521. Limiting rib; 522. Limiting rib; 6. Mounting frame. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] In order to solve the technical problem in the prior art that when the pressing force applied by the user is too large, the pressure column on the press key directly presses against the trigger switch, which easily causes the trigger switch to be damaged due to the load exceeding its working limit, the utility model provides a key structure that can prevent the trigger switch from being damaged due to the load exceeding the limit, extend the service life of the key structure, and has a simple structure and low cost.

[0038] It should be noted that the button structure described in the present invention is used for but not limited to printers, etc. For the sake of convenience, in the present invention, only the button structure applied to a printer is used as an example for explanation. The principle of applying the button structure to other types of equipment is essentially the same as that applied to a printer, and will not be described in detail here.

[0039] See also Figures 1 to 6 , Figures 1 to 6 This is a structural schematic diagram of a key structure in an embodiment of the present invention, which includes a housing 1, a circuit board 2, a trigger switch 3, a cantilever 4 and a pressing portion 5; the circuit board 2 is provided in the housing 1; the trigger switch 3 is provided on the circuit board 2; one end of the cantilever 4 is connected to the housing 1, and the other end is spaced apart from the side of the circuit board 2 where the trigger switch 3 is provided, and has a pressing end surface 41 close to the trigger switch 3; the pressing portion 5 includes a trigger bone 51 and a limiting bone 52 provided on the pressing end surface 41. The trigger bone 51 can press against the trigger switch 3 when the cantilever 4 is pressurized. The limiting bone 52 falls outside the trigger switch 3 when the trigger bone 51 presses against the trigger switch 3, and the distance between the trigger bone 51 and the circuit board 2 is less than or equal to 0.2 mm.

[0040] In the key structure provided by the present invention, when a user presses one end of the cantilever 4 provided with a pressing end surface 41, the trigger bone 51 provided with the pressing end surface 41 is driven to approach and press against the trigger switch 3. Because when the trigger bone 51 just presses against the trigger switch 3, the distance between the limit bone 52 and the circuit board 2 is less than or equal to 0.2 mm; therefore, when the pressing force applied by the user is too large, the trigger bone 51 continues to squeeze the trigger switch 3 and moves down by up to 0.2 mm. The limit bone 52 will press against the circuit board 2, preventing the trigger bone 51 from continuing to squeeze the trigger switch 3, preventing the trigger switch 3 from being damaged due to the load exceeding the limit, extending the service life of the key structure, and having a simple structure and low cost. It should be noted that the specific structure and principle of the trigger switch 3 and the circuit board 2 are existing technologies and will not be elaborated here. The trigger switch 3 is triggered when it is pressed against the trigger bone 51.

[0041] In one embodiment, see Figures 3 to 5 There are multiple limiting bones 52, and the multiple limiting bones 52 are arranged at intervals around the trigger bone 51.

[0042] In this embodiment, multiple stoppers 52 are spaced around the trigger bone 51 to prevent uneven force between the stoppers 52 and the circuit board 2, which could cause the trigger bone 51 to deviate and squeeze the trigger switch 3. This further reduces the risk of damage to the trigger switch 3 due to excessive force on the trigger bone 51. Specifically, in the example shown in the accompanying drawings, four stoppers 52 are provided.

[0043] In one embodiment, see Figure 7 The trigger bone 51 includes two trigger ribs 511 , one end of the two trigger ribs 511 is connected to the pressing end surface 41 , and the middle parts of the two are connected and cross-arranged.

[0044] In this embodiment, the two trigger ribs 511 are cross-arranged to improve the force uniformity between the trigger bone 51 and the trigger switch 3, ensure that the trigger bone 51 can stably trigger the trigger switch 3, and reduce the risk of damage to the trigger switch 3 due to excessive concentration of force on the trigger bone 51.

[0045] In one embodiment, the limiting bone 52 includes a limiting rib 521 and a limiting rib 522. The limiting rib 521 is connected to the pressing end surface 41 and one side faces the trigger bone 51. The limiting rib 522 is connected to the pressing end surface 41 and is connected to the side of the limiting rib 521 away from the trigger bone 51.

[0046] In this embodiment, the limiting bone 52 is set in the form of a limiting rib plate 521 and a limiting rib 522. On the one hand, the strength of the limiting bone 52 is improved, and on the other hand, the limiting bone 52 can stably protect the trigger bone 51 to prevent the trigger bone 51 from deviating from applying a load to the trigger switch 3 or applying an excessive load.

[0047] In one embodiment, see Figure 8 The cantilever 4 includes a pressing plate 42 and a plurality of arm bodies 43. The plurality of arm bodies 43 are arranged at intervals around the trigger switch 3. Each arm body 43 has a connecting end 431 and a hanging end 432 at both ends. The connecting end 431 is connected to the housing 1, and the hanging end 432 is suspended on the side of the circuit board 2 where the trigger switch 3 is provided, and is opposite to the trigger switch 3. The pressing plate 42 is connected to the plurality of hanging ends 432; wherein, the pressing end surface 41 is formed on the side of the pressing plate 42 close to the trigger switch 3.

[0048] In this embodiment, multiple arms 43 are provided to ensure uniform distribution of spring force on the keys of the pressing plate 42, resulting in a uniform feel, and to prevent excessive key deflection and resulting in key sticking when pressing the key edges. Specifically, in the example shown in the accompanying drawings, four arms 43 are provided, and the four arms 43 are spaced apart along the circumference of the pressing plate 42.

[0049] In one embodiment, the arm 43 is arranged in an arc shape and gradually moves away from the pressing plate 42 from the suspension end 432 to the connection end 431 .

[0050] In this embodiment, each arm 43 is set to an arc shape in the above-mentioned form, so that the arc-shaped arm 43 can increase the length of the cantilever 4 as much as possible within a limited space, avoiding the phenomenon that the cantilever 4 is too short and the key feel is too hard, thereby reducing the occupied space while improving the user experience.

[0051] In one embodiment, the arm body 43 further includes an elastic section 433 located between the connecting end 431 and the suspension end 432. The connecting end 431, the elastic section 433 and the suspension end 432 are connected in sequence, and the dimensions of the connecting end 431 and the suspension end 432 are larger than those of the elastic section 433.

[0052] In this embodiment, the sizes of the connecting end 431 and the suspension end 432 are increased to improve the connection strength between the arm 43 and the housing 1 and the pressing plate 42, while also ensuring that the cantilever 4 has sufficient elasticity to improve the user's pressing feel.

[0053] In one embodiment, see Figure 8 and Figure 9 The housing 1 has a mounting opening 1a connected to its inner cavity, the circuit board 2 is installed in the inner cavity of the housing 1, and the trigger switch 3 is located on the side of the circuit board 2 close to the mounting opening 1a and facing the mounting opening 1a; the button structure also includes a mounting frame 6, which is detachably mounted on the inner wall of the housing 1 and is arranged around the mounting opening 1a. Multiple connecting ends 431 are respectively connected to the mounting frame 6 and are located in the same horizontal plane. The end of the pressing plate 42 away from the trigger switch 3 extends out of the inner cavity of the housing 1 from the mounting opening 1a.

[0054] In this embodiment, a mounting frame 6 is added, and the connecting ends 431 of the multiple arms 43 are connected to the mounting frame 6. Ensuring the flatness of the mounting frame 6 allows the multiple arms 43 to be aligned horizontally, thereby preventing the pressing plate 42 from twisting and facilitating installation. Furthermore, in this embodiment, the mounting frame 6 is removably connected to the inner wall of the housing 1, allowing for easy replacement of the mounting frame 6 and cantilever 4 as needed, resulting in improved practicality. Specifically, the mounting frame 6 is removably connected to the inner wall of the housing 1 via bolts, resulting in a simple and reliable structure.

[0055] In one embodiment, see Figure 10 The end surface of the pressing plate 42 away from the trigger switch 3 is provided with a mounting groove 42a, and the cantilever 4 further includes a pressing flexible pad 44, which is placed in the mounting groove 42a.

[0056] In this embodiment, a flexible pressing pad 44 is further provided on the pressing plate 42 to further enhance the user experience. Furthermore, the flexible pressing pad 44 is installed through the mounting slot 42a, making it easier for the user to install, clean, and replace the pad, thereby providing better practicality.

[0057] In addition, the present invention further provides a printer, comprising any one of the above-described key structures. It should be noted that the detailed structure of the printer's key structure can be referenced to the aforementioned key structure embodiments and will not be further described here. Since the aforementioned key structure is used in the printer of the present invention, the embodiments of the printer of the present invention include all technical solutions of all the aforementioned key structure embodiments, and the technical effects achieved are identical, and will not be further described here.

[0058] In order to better understand the present invention, the following Figures 1 to 10 The technical solution of the utility model is described in detail:

[0059] In this solution, four arms 43 are evenly arranged above the pressing plate 42. The use of curved arms 43 maximizes the length of the cantilever 4 within a limited space, preventing the cantilever 4 from being too short and resulting in a hard feel when pressing the keys. Furthermore, the four arms 43 ensure even distribution of the elastic force of the pressing plate 42, resulting in a uniform feel, and prevent excessive tilting of the pressing plate 42 when pressing the edge of the pressing plate 42, which can cause the key to become stuck. Furthermore, by adding a mounting frame 6 and securing the connecting end 431 of the arm 43 to the mounting frame 6 to ensure flatness of the installation, the four arms 43 are positioned on the same horizontal plane.

[0060] The key structure's stopper 52 acts as a stop against the PCB, ensuring a 0.2mm gap between the stopper 52 and the PCB when the trigger rib 51 triggers the trigger switch 3. As the pressing plate 42 continues to press downward, the stopper 52 contacts the PCB, preventing further depression of the key and preventing damage to the touch switch.

[0061] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A key structure, characterized in that: include: chassis; a circuit board, disposed in the housing; a trigger switch, provided on the circuit board; a cantilever, one end of which is connected to the housing, the other end of which is spaced apart from the side of the circuit board where the trigger switch is provided, and has a pressing end surface close to the trigger switch; and The pressing portion includes a trigger bone and a limiting bone provided on the pressing end surface. The trigger bone can press against the trigger switch when the cantilever is pressed. The limiting bone falls outside the trigger switch when the trigger bone presses against the trigger switch, and the distance between the limiting bone and the circuit board is less than or equal to 0.2 mm.

2. The key structure according to claim 1, characterized in that: There are multiple limiting bones, and the multiple limiting bones are spaced and arranged around the circumference of the triggering bone.

3. The key structure according to claim 2, characterized in that: The trigger bone includes two trigger ribs, one end of the two trigger ribs is connected to the pressing end surface, and the middle parts of the two are connected and cross-arranged.

4. The key structure according to claim 2 or 3, characterized in that: The limiting bone includes a limiting rib plate and a limiting rib bar. The limiting rib plate is connected to the pressing end surface and one side faces the trigger bone. The limiting rib bar is connected to the pressing end surface and connected to the side of the limiting rib plate away from the trigger bone.

5. The key structure according to claim 1, characterized in that: The cantilever includes a pressing plate and a plurality of arm bodies, wherein the plurality of arm bodies are spaced apart and arranged around the circumference of the trigger switch, and each arm body has a connecting end and a hanging end at both ends, wherein the connecting end is connected to the housing, and the hanging end is suspended on a side of the circuit board where the trigger switch is provided and is directly opposite to the trigger switch, and the pressing plate is connected to the plurality of hanging ends; Wherein, the pressing end surface is formed on a side of the pressing plate close to the trigger switch.

6. The key structure according to claim 5, characterized in that: The arm is arranged in an arc shape and gradually moves away from the pressing plate from the suspension end to the connection end.

7. The key structure according to claim 5, characterized in that: The arm body further includes an elastic section located between the connecting end and the suspension end. The connecting end, the elastic section and the suspension end are connected in sequence, and sizes of the connecting end and the suspension end are larger than sizes of the elastic section.

8. The key structure according to claim 5, characterized in that: The housing has a mounting opening communicating with the inner cavity thereof, the circuit board is mounted in the inner cavity of the housing, and the trigger switch is located on a side of the circuit board close to the mounting opening and facing the mounting opening; The button structure also includes a mounting frame, which is detachably mounted on the inner wall of the casing and is arranged around the mounting opening. The multiple connection ends are respectively connected to the mounting frame and are located in the same horizontal plane. The end of the pressing plate away from the trigger switch extends out of the inner cavity of the casing from the mounting opening.

9. The key structure according to claim 5, characterized in that: An end surface of the pressing plate away from the trigger switch is provided with a mounting groove, and the cantilever further includes a pressing flexible pad, and the pressing flexible pad is placed in the mounting groove.

10. A printer, characterized in that: Comprising the key structure according to any one of claims 1 to 9.

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