CN109950079B

CN109950079B - Resistance type key with adjustable conduction stroke

Info

Publication number: CN109950079B
Application number: CN201910213485.5A
Authority: CN
Inventors: 文旭光
Original assignee: Dongguan Redong Electronic Technology Co ltd
Current assignee: Dongguan Redong Electronic Technology Co ltd
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-08-28
Anticipated expiration: 2039-03-20
Also published as: CN109950079A

Abstract

The invention discloses a resistance type key with adjustable conduction stroke, which comprises a key seat, a key shaft and an upper cover; the key seat is connected with the upper cover in a buckling way and assembled into a shell, the shell is provided with a containing groove, the key shaft is arranged in the containing groove and fixedly connected with the keycap after extending out of the containing groove and the upper cover, and the shaft core of the key shaft is provided with a spring; a movable contact piece and a fixed terminal are arranged beside the matching key shaft in the accommodating groove, the movable contact piece and the fixed terminal are both electrically connected with the PCB, an arc-shaped conduction part is formed on the movable contact piece, the starting point of the arc-shaped conduction part is in contact connection with the fixed terminal, and the distance between the arc-shaped conduction part and the starting point of the contact interval arc-shaped conduction part in movable contact connection with the fixed terminal is defined as a conduction stroke; the arc conduction part is pushed against and is connected with the static terminal contact and makes the conduction stroke increase or reduce when the key shaft moves vertically, so that the resistance between the movable contact piece and the static terminal is increased or reduced, and the key is conducted when the resistance between the movable contact piece and the static terminal corresponding to the conduction stroke is matched with one of resistance threshold values of a plurality of key conduction.

Description

Resistance type key with adjustable conduction stroke

Technical Field

The invention relates to the technical field of electronic products, in particular to a resistance type key with an adjustable conduction stroke.

Background

Along with the continuous progress of the life of people, the use of computers is more and more popular in the society, and the computer is an essential article in the life of people. The keyboard is an external device of the computer, the operation performance of the keyboard is gradually improved along with continuous innovation of the technology, and the reliability and the functionality of the keyboard are better and better from mechanical to photoelectric, from photoelectric to optical, and from wired to wireless.

A mechanical keyboard switch (patent number: 201320172454.8) is disclosed in the Chinese patent, which comprises a key seat, a press handle and an upper cover, wherein a concave cavity is arranged in the key seat, a positioning column is convexly arranged at the bottom end in the key seat, a positioning groove is arranged on the positioning column, a return spring is connected on the positioning groove, one end of the return spring is connected with the positioning column, the other end of the return spring is connected with the press handle, the upper cover and the key seat are buckled to form a cavity, a static contact piece and a movable contact piece are arranged in the cavity, the static contact piece comprises an integrally formed welding piece and a contact piece, the movable contact piece comprises a fixing piece and a welding piece, and the welding piece of the static contact piece and the welding piece of the movable contact piece extend out from.

The 201320172454.8 patent discloses a conventional mechanical keyboard, but the keyboard switches in the market at present all use contact type keyboard switches formed by conducting a contact and a contact, and the keyboard switches and the contact type keyboard switches in the prior art have the disadvantages that the prior keyboard switches can only be conducted once, namely, only two groups of states of conduction and disconnection can be conducted, and the keyboard switches cannot be conducted too much, so that the keyboard input function is single and the experience feeling is not strong; meanwhile, most of the conduction strokes of the existing keyboard switches are fixed, and the conduction strokes of the keys or multipoint strokes cannot be set.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a resistance type conduction stroke adjustable key which has a compact structure, good contact and good stability and can set the conduction stroke of the key or the conduction of multiple points of strokes, aiming at the defects in the prior art.

According to a first aspect of the invention, a technical scheme adopted by the invention is that a resistance type conduction stroke-adjustable key comprises a key seat, a key shaft and an upper cover; the key seat and the upper cover are connected in a buckling manner and assembled into a shell, the shell is provided with a containing groove for embedding a key shaft, the key shaft is movably embedded in the containing groove, the top end of the key shaft extends out of the containing groove and the upper cover and then is fixedly connected with the key cap, a shaft core of the key shaft can also movably penetrate through the key seat and extend out of a PCB (printed circuit board) arranged at the bottom end of the key seat, and a spring movably connected with the key seat is sleeved on the shaft core of the key shaft; a movable contact piece and a fixed terminal are arranged beside a matching key shaft in the accommodating groove, the movable contact piece and the fixed terminal are both electrically connected with the PCB, an arc-shaped conduction part used for being in contact connection with the fixed terminal is formed in the movable contact piece, the starting point of the arc-shaped conduction part is in contact connection with the fixed terminal, and the distance between the arc-shaped conduction part and the contact point of the movable contact connection of the fixed terminal and the starting point of the arc-shaped conduction part is defined as a conduction stroke; the arc conduction part is pushed to be in contact connection with the static terminal when the key shaft moves vertically, the conduction stroke is increased or reduced, the resistance between the movable contact piece and the static terminal is increased or reduced in a matching mode, and the key is conducted when the resistance between the movable contact piece and the static terminal corresponding to the conduction stroke is matched with one of a plurality of resistance threshold values set for conducting the key.

As a further elaboration of the above technical solution:

in the technical scheme, a plurality of buckling grooves are formed in the four sides of the key seat, buckling platforms are formed in the buckling grooves and close to the top end of the key seat, buckles matched with the buckling grooves in position and number are formed in the four sides of the upper cover, and each buckle is embedded in the buckling groove, enables a clamping hook of the buckle to be connected with a matched buckling platform buckle and is matched with the key seat and connected with the upper cover in a buckling mode.

In the above technical solution, the key seat is concavely provided with a lower groove, the upper cover is provided with a through groove of the upper cover, and when the key seat is connected with the upper cover in a buckling manner, the lower groove is butted with the through groove and matched to form the accommodating groove; guide grooves are formed in two side walls of the lower groove, guide portions matched with the guide grooves in structure are formed in the outer sides of the key shafts, and the guide portions are embedded in the guide grooves and matched with the key shafts and movably embedded in the containing grooves.

In the above technical scheme, the through groove inner side wall is further provided with a guide limiting groove, the guide portion is movably embedded in the matched guide limiting groove and vertically moves along the guide limiting groove, so that the key shaft can vertically move upwards, and the guide limiting groove is further used for limiting the stroke of the key shaft moving vertically upwards.

In the technical scheme, the bottom end of the lower groove is also convexly provided with a positioning guide pillar, one end of the spring is connected with the positioning guide pillar, the other end of the spring extends into a positioning hole formed in the positioning guide pillar and is connected with the key seat, and the spring is used for providing damping of vertical resilience of the key shaft; the positioning guide pillar is provided with a first through hole penetrating through the key base, when the key shaft is movably assembled in the accommodating groove, the shaft core of the key shaft can extend out along the first through hole, and the shaft core matched with the key shaft can also movably penetrate through the key base and extend out of the PCB arranged at the bottom end of the key base.

In the above technical solution, the movable contact piece includes a first pin, a first body, a first connection portion, a second connection portion and the arc conduction portion, the first pin extends vertically downward from the first body and vertically penetrates through the key base to be electrically connected to the PCB, the first connection portion is bent and extends from the other end of the first body to be parallel to the first body, the second connection portion is disposed perpendicular to the first connection portion, and the arc conduction portion extends from the end of the second connection portion to be elastically inclined downward; the static terminal is positioned between the first body and the arc-shaped conduction part on the arrangement position and comprises a terminal pin and a body which are integrally formed, and the terminal pin vertically extends downwards from the body and vertically penetrates through the key seat to be connected with the PCB; the body is shaped like a Chinese character 'Li', and the body is a contact part movably connected with the arc-shaped conduction part in a contact way.

In the above technical solution, the fixed terminal is a metal fixed terminal, the movable contact piece is a metal movable contact piece, and the spring is a pressure spring.

In the technical scheme, the system in key axle top has the cross plug, the system has the spliced pole that the downward protrusion extends on the key cap, concave system has the cross slot on the spliced pole, the cross plug card is gone into in the cross slot, the matching makes the key cap with the key hub connection.

In the above technical scheme, the key base is a plastic key base, the upper cover is a plastic upper cover, the key shaft is a plastic key shaft, and the key cap is a plastic key cap.

Compared with the prior art, the resistance type conduction stroke adjustable key has the advantages that the arc-shaped conduction part which can be movably connected with the static terminal in a contact manner is arranged on the movable contact piece, the resistance between the movable contact piece and the static terminal is determined according to the contact connection distance between the arc-shaped conduction part and the static terminal, namely the conduction stroke, and the key is matched for conduction when the arc-shaped conduction part is in contact connection with the static terminal, namely the resistance between the movable contact piece and the static terminal is matched with the set key conduction resistance threshold value; when the button is pressed, the key shaft vertically moves downwards, the arc-shaped conduction part is in contact connection with the static terminal, the conduction stroke (resistance change) is changed, the conduction condition is set by setting a plurality of conduction strokes, and the conduction stroke of the button is further set; meanwhile, the key disclosed by the invention is compact in structure and good in stability.

Drawings

Fig. 1 is a perspective view of a resistive type key with adjustable conduction stroke according to the present embodiment;

FIG. 2 is an exploded view of the resistive conducting stroke adjustable button according to the present embodiment;

fig. 3 is a structural view of a key pad of the resistive on-stroke adjustable key according to the present embodiment;

fig. 4 is a structural view of the upper cover of the resistance type conduction stroke adjustable key of the embodiment;

fig. 5 is a structural view of the movable contact piece of the present embodiment;

fig. 6 is a cross-sectional view of the resistive conducting stroke adjustable key of the present embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiments described by referring to the drawings are exemplary and intended to be used for explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a lesser level than the second feature

Fig. 1-6 illustrate an embodiment of the present invention, and referring to fig. 1-6, a resistive type conduction stroke adjustable key includes a key base 1, a key shaft 2, and an upper cover 3; the key base 1 and the upper cover 3 are connected in a buckling manner and assembled into a shell, in practice, the key base 1 is fixed on the fixing plate 9, the shell is provided with a containing groove 001 for containing and embedding the key shaft 2, the key shaft 2 is movably embedded in the containing groove 001, and the top end of the key shaft 2 extends out of the containing groove 001 and the upper cover 3 and then is fixedly connected with the keycap 4; a movable contact piece 7 and a fixed terminal 8 are arranged beside the matching key shaft 2 in the containing groove 001, the movable contact piece 7 and the fixed terminal 8 are both electrically connected with the PCB 6, in practice, pins of the movable contact piece 7 and the fixed terminal 8 are welded on the PCB 6, an arc conduction part 71 for contacting and connecting with the fixed terminal 8 is formed on the movable contact piece 7, a starting point of the arc conduction part 71 is in contact connection with the fixed terminal 8, a distance between a contact point (a point far away from the starting point and at which the foremost end of the arc conduction part 71 is in contact with the fixed terminal 8) in movable contact connection with the fixed terminal 8 and a starting point of the arc conduction part 71 is defined as a conduction stroke, it should be noted that in practice, the starting point is a point at which the arc conduction part 71 is in initial contact connection with the fixed terminal 8, the contact point is a real-time contact point at which the arc conduction part 71 is in contact with the fixed terminal 8, and the contact position can be changed along, the movable contact piece 7 and the fixed terminal 8 of the key in the embodiment are always kept in contact connection, and the conduction of the key is determined according to the resistance determined by the conduction stroke between the movable contact piece 7 and the fixed terminal 8; the arc-shaped conduction part 71 is pushed to be in contact connection with the fixed terminal 8 when the key shaft 2 moves vertically, the conduction stroke is increased (vertically moves downwards) or decreased (vertically rebounds upwards), the resistance between the movable contact piece 7 and the fixed terminal 8 is increased or decreased in a matching mode, and the key is conducted when the resistance between the movable contact piece 7 and the fixed terminal 8 corresponding to the conduction stroke is matched with one of a plurality of resistance thresholds of the key conduction; when the key shaft 2 is released, the compression amount of the spring 5 is provided with the power for the key shaft 2 to rebound vertically and upwards by the key shaft 2 in the downward movement process, wherein the vertical movement of the shaft core 21 can act on the arc-shaped conducting part 71, and the stroke distance (contact area) for the contact connection of the arc-shaped conducting part 71 and the static terminal 8 is changed, so that the equivalent resistance between the movable contact piece 7 and the static terminal 8 is changed along with the change of the arc-shaped conducting part, when the resistance between the movable contact piece 7 and the static terminal 8 is matched with the conducting resistance corresponding to the set function, the corresponding function is correspondingly keyed in response, and when the key shaft 2 is released; when the key of this embodiment is assembled on a keyboard and used, different functions can be set on the same key according to pressing strokes as required, for example, the first function, the second function and the third function are respectively set as the conducting and blocking strokes of the arc-shaped conducting part 71 and the fixed terminal 8 are respectively 2mm, 4mm and 5mm (the control part of the keyboard detects between the movable contact 7 and the fixed terminal 8), when the key is pressed downwards and the shaft core 21 moves downwards and the conducting stroke is 2mm, the first function is responded, and when the conducting stroke of the key is continued to be 4mm and 5mm, the second function and the third function are responded correspondingly; of course, in practice, a plurality of functions may be set according to the pressing stroke (on stroke), so that the functionality and the user experience of the key may be enhanced.

Referring to fig. 1-6, in this embodiment, a plurality of grooves 101 are formed on the peripheral side of the key base 1, a plurality of fastening bases 102 are formed in each groove 101 near the top end of the key base 1, fasteners 301 matched with the grooves 101 in terms of position and number are formed on the peripheral side of the upper cover 3, and each fastener 301 is embedded in the groove 101, and the hook 302 thereof is fastened with the matched fastening base 102 to match the fastening connection between the key base 1 and the upper cover 3.

Referring to fig. 1 to 6, in this embodiment, a lower groove 103 is recessed on the key seat 1, a through groove 303 of the upper cover 3 is formed in the upper cover 3, and when the key seat 1 is connected to the upper cover 3 in a snap-fit manner, the lower groove 103 is abutted to and matched with the through groove 303 to form the receiving groove 001; guide grooves 104 are formed in two side walls of the lower groove 103, guide parts 22 matched with the guide grooves 104 in structure are formed in the outer sides of the key shafts 2, the guide parts 22 are embedded in the guide grooves 104, and the matched key shafts 2 are movably embedded in the accommodating grooves 001; referring to fig. 2-6, in this embodiment, the inner side wall of the through groove 303 is further formed with a guide limiting groove 304, the guide portion 22 is movably embedded in the matched guide limiting groove 304 and vertically moves along the guide limiting groove 304, so that the key shaft 2 can vertically move upwards, and the guide limiting groove 304 is further used for limiting the stroke of the vertical upwards movement of the key shaft 2, that is, the key shaft 2 can upwards move along the guide limiting groove 304, but the top end of the guide limiting groove 304 is closed, so that when the key shaft 2 upwards moves to the set position, the key shaft is limited by the guide limiting groove 304 and moves in the vertical direction; referring to fig. 2-5, in this embodiment, the bottom end of the lower groove 103 is further provided with a positioning guide pillar 105 in a protruding manner, one end of the spring 5 is connected to the shaft core 21, and actually, the spring 5 is sleeved on the shaft core 21, and the other end of the spring extends into a positioning hole (not numbered in the drawing) formed in the positioning guide pillar 105 and is connected to the key base 1, and the spring 5 is used for providing damping of vertical springback of the key shaft 2; the positioning guide post 105 is provided with a first through hole 106 penetrating through the key base 1, when the key shaft 2 is movably assembled in the accommodating groove 001, the shaft core 21 of the key shaft 2 can extend out along the first through hole 106, the shaft core 21 matched with the key shaft 2 can also movably penetrate through the key base 1 and the PCB 6 arranged at the bottom end of the key base 1, and in practice, the shaft core 21 extends out and returns back along the first through hole 106, so that the key shaft 2 has enough stroke in the vertical direction to move vertically in a matching mode, and key pressing operation is carried out in a matching mode.

Referring to fig. 1 to 6, in this embodiment, the movable contact 7 includes a first pin 72, a first body 73, a first connection portion 74, a second connection portion 75 and the arc-shaped conduction portion 71, the first pin 72 extends vertically downward from the first body 73 and vertically penetrates through the key seat 1 to be electrically connected to the PCB 6, the first connection portion 74 is bent and extends from the other end of the first body 73 to be parallel to the first body 73, the second connection portion 75 is disposed perpendicular to the first connection portion 74, and the arc-shaped conduction portion 71 extends from the end of the second connection portion 75 to be inclined and downward; the static terminal 8 is located between the first body 73 and the arc-shaped conduction part 71 in the arrangement position, the static terminal 8 comprises a terminal pin 81 and a body 82 which are integrally formed, and the terminal pin 81 vertically extends downwards from the body 82 and vertically penetrates through the key seat 1 to be connected with the PCB 6; the body 82 is a T-shaped body, and the body 82 is a contact part movably connected with the arc-shaped conduction part 71 in a contact way; in this embodiment, the fixed terminal 8 is a metal fixed terminal, the movable contact piece 7 is a metal movable contact piece, and the spring 5 is a compression spring.

Referring to fig. 1-6, in this embodiment, a cross plug 24 is formed at the top end of the key shaft 2, a connecting column 41 protruding downward is formed on the keycap 4, a cross slot 42 is formed on the connecting column 41 in a concave manner, and the cross plug 24 is clamped into the cross slot 42 to match and connect the keycap 4 and the key shaft 2; in this embodiment, the key pad 1 is a plastic key pad, the upper cover 3 is a plastic upper cover, the key shaft 2 is a plastic key shaft, and the key cap 4 is a plastic key cap.

The technical scope of the present invention is not limited to the above embodiments, and any modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are still within the scope of the novel technical solution.

Claims

1. A resistance type key with adjustable conduction stroke is characterized by comprising a key seat, a key shaft and an upper cover; the key seat and the upper cover are connected in a buckling manner and assembled into a shell, the shell is provided with a containing groove for embedding a key shaft, the key shaft is movably embedded in the containing groove, the top end of the key shaft extends out of the containing groove and the upper cover and then is fixedly connected with the key cap, a shaft core of the key shaft can also movably penetrate through the key seat and extend out of a PCB (printed circuit board) arranged at the bottom end of the key seat, and a spring movably connected with the key seat is sleeved on the shaft core of the key shaft; a movable contact piece and a fixed terminal are arranged beside a matching key shaft in the accommodating groove, the movable contact piece and the fixed terminal are both electrically connected with the PCB, an arc-shaped conduction part used for being in contact connection with the fixed terminal is formed in the movable contact piece, the starting point of the arc-shaped conduction part is in contact connection with the fixed terminal, and the distance between the arc-shaped conduction part and the contact point of the movable contact connection of the fixed terminal and the starting point of the arc-shaped conduction part is defined as a conduction stroke; the arc-shaped conduction part is pushed to be in contact connection with the static terminal when the key shaft vertically moves, the conduction stroke is increased or reduced, the resistance between the movable contact piece and the static terminal is increased or reduced in a matching mode, and the keys are conducted when the resistance between the movable contact piece and the static terminal corresponding to the conduction stroke is matched with one of resistance thresholds of the multiple keys; the movable contact piece comprises a first pin, a first body, a first connecting part, a second connecting part and an arc conducting part which are integrally formed, the first pin vertically extends downwards from the first body and vertically penetrates through the key seat to be electrically connected with the PCB, the first connecting part is elastically bent and extends from the other end of the first body to be parallel to the first body, the second connecting part is arranged perpendicular to the first connecting part, and the arc conducting part elastically inclines and extends downwards from the tail end of the second connecting part; the static terminal is positioned between the first body and the arc-shaped conduction part on the arrangement position and comprises a terminal pin and a body which are integrally formed, and the terminal pin vertically extends downwards from the body and vertically penetrates through the key seat to be connected with the PCB; the body is shaped like a Chinese character 'Li', and the body is a contact part movably connected with the arc-shaped conduction part in a contact way.

2. A resistive conducting stroke adjustable key according to claim 1, wherein a plurality of grooves are formed around the key base, a plurality of locking platforms are formed in each groove near the top of the key base, and a plurality of fasteners are formed around the top cover and matched with the grooves in terms of position and number, and each of the fasteners is embedded in the groove and has a hook thereof engaged with the corresponding locking platform fastener to match the key base and the top cover for locking connection.

3. A resistive conducting stroke adjustable key according to claim 2, wherein a lower groove is recessed in the key base, a through groove of the upper cover is formed in the upper cover, and when the key base is fastened to the upper cover, the lower groove and the through groove are butted and matched to form the accommodating groove; guide grooves are formed in two side walls of the lower groove, guide portions matched with the guide grooves in structure are formed in the outer sides of the key shafts, and the guide portions are embedded in the guide grooves and matched with the key shafts and movably embedded in the containing grooves.

4. A resistive conducting stroke adjustable key according to claim 3, wherein the inside wall of the through groove is further formed with a guiding limiting groove, the guiding portion is movably embedded in the matching guiding limiting groove and vertically moves along the guiding limiting groove, so as to enable the key shaft to vertically move upwards, and the guiding limiting groove is further used for limiting the stroke of the key shaft moving vertically upwards.

5. The key of claim 4, wherein a positioning guide post is further protruded from a bottom end of the lower groove, one end of the spring is connected to the shaft core, and the other end of the spring extends into a positioning hole formed in the positioning guide post and is connected to the key seat, and the spring is used for damping vertical springback of the key shaft; the positioning guide pillar is provided with a first through hole penetrating through the key base, when the key shaft is movably assembled in the accommodating groove, the shaft core of the key shaft can extend out along the first through hole, and the shaft core matched with the key shaft can also movably penetrate through the key base and extend out of the PCB arranged at the bottom end of the key base.

6. The key of claim 1, wherein the fixed terminal is a metal fixed terminal, the movable contact piece is a metal movable contact piece, and the spring is a compression spring.

7. A resistive conducting stroke adjustable key according to claim 1, wherein a cross plug is formed at the top end of the key shaft, a connecting column protruding downwards is formed on the key cap, a cross slot is formed on the connecting column in a concave manner, the cross plug is clamped into the cross slot, and the key cap is connected with the key shaft in a matching manner.

8. The key of claim 1, wherein the key pad is a plastic key pad, the top cover is a plastic top cover, the key shaft is a plastic key shaft, and the key cap is a plastic key cap.