CN216133790U

CN216133790U - Light touch key switch

Info

Publication number: CN216133790U
Application number: CN202122908627.5U
Authority: CN
Inventors: 林志明
Original assignee: Zhejiang Chenming Electronics Co ltd
Current assignee: Zhejiang Chenming Electronics Co ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-03-25
Anticipated expiration: 2031-11-24

Abstract

The utility model provides a light-touch key switch, which comprises a base, an upper cover, a key structure, a static contact piece structure and a movable contact piece structure, wherein the static contact piece structure consists of a first contact piece and two second contact pieces, the first contact piece and the two second contact pieces are arranged on the base in an extending way along the length direction of the base and respectively provided with a first output piece and a second output piece which are arranged in an extending way along the width direction of the base, the first output piece and the second output piece are arranged on a positioning surface of the base in a penetrating way, the movable contact piece structure is kept in contact with the two second contact pieces through two supporting contact pieces, an arc-shaped elastic piece and the first contact piece are oppositely arranged up and down, the first contact piece and the first output piece and the two second contact pieces are integrated into a whole, the structure is good in stability, the contact resistance is reduced, the forming and the manufacturing are convenient, the installation structure is simplified, and the integrated injection molding mode can be directly adopted to be embedded on the base, the electrical performance of the touch key switch is improved.

Description

Light touch key switch

Technical Field

The utility model relates to the technical field of switches, in particular to a light-touch key switch.

Background

The light touch switch is an electronic switch, also called a key switch, when in use, the switch can be switched on by lightly pressing the switch, when the hand is released, the switch is switched off, the internal structure of the light touch switch realizes the on-off by the elastic force of a metal elastic sheet (movable contact sheet), the light touch switch has the advantages of small contact resistance load, accurate operation force error, diversified specifications and the like, and is widely applied to the aspects of electronic equipment, white household appliances and the like.

The existing light touch switch mainly comprises a base, a metal cover plate, a spring plate structure and a button, wherein the spring plate structure and the button are arranged between the base and the metal cover plate, at least two conductive terminals are arranged at the bottom of the base, the light touch switch is welded on a circuit board in a surface mounting mode of the conductive terminals, in order to realize circuit conduction between the spring plate structure and the two conductive terminals, two contacts electrically connected with the two conductive terminals are arranged inside the base, and the conductive terminals are embedded on the base, so that the inner ends of the conductive terminals are in contact with or welded together with the contacts in an abutting mode, the installation and connection are complex, the structural stability is poor, the contact resistance is easy to increase, and the electrical performance of the light touch switch is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the problems that the inner end of the conductive terminal is in butt contact with or welded with the contact of the light touch switch in the prior art, the installation and connection are complex, the structural stability is poor, and the electrical performance of the light touch switch is influenced.

In order to solve the above technical problem, the present invention provides a tact key switch, including:

the base is provided with an installation inner cavity and a positioning surface which is arranged at one side of the base and is used for connecting the circuit board;

the upper cover is fixed on the base through a connecting structure, and a key structure is movably arranged between the upper cover and the base;

the static contact piece structure comprises a first contact piece and two second contact pieces, wherein the first contact piece extends along the length direction of the base and is arranged at the center of the bottom of the mounting inner cavity, and the two second contact pieces are arranged on two sides of the first contact piece in parallel; the first contact piece is provided with a first output piece which extends and is formed along the width direction of the base, a second output piece which is parallel to the first output piece is integrally formed between the two second contact pieces, and the first output piece and the second output piece are respectively provided with a first end pin and a second end pin which are arranged on the positioning surface in a penetrating mode at the same side;

the movable contact piece structure is arranged in the installation inner cavity and comprises an arc-shaped elastic piece and two supporting contact pieces, wherein the arc-shaped elastic piece is vertically and oppositely arranged with the first contact piece, the two supporting contact pieces are positioned on two sides of the arc-shaped elastic piece and are respectively in contact with the two second contact pieces in an attaching mode, and the arc-shaped elastic piece is in contact with the first contact piece under the driving of the key structure.

As a preferred scheme, two strip-shaped grooves suitable for mounting the first output sheet and the second output sheet are arranged on two sides of the bottom of the mounting inner cavity, and one ends of the two strip-shaped grooves extend onto the positioning surface, so that the first end pin and the second end pin are arranged on the same side of the positioning surface.

As a preferable scheme, one end of the first contact piece is integrally connected to the first output piece, and one ends of the two second contact pieces are respectively integrally connected to the second output piece; the first contact piece and the first output piece, and the second contact piece and the second output piece are respectively embedded in the base through integral injection molding.

Preferably, the end portions of the first and second terminal pins are bent to extend a distance to the lower side of the positioning surface.

Preferably, the two supporting contact pieces are of concave structures, and a height difference is formed between the supporting contact pieces and the arc-shaped elastic pieces.

As a preferable scheme, a clamping table structure or a clamping groove structure is oppositely arranged on the side wall of the installation inner cavity, so that two ends of the movable contact spring structure, which are bent in an arc shape, are respectively positioned and abutted on the clamping table structure or the clamping groove structure.

As a preferred scheme, two positioning columns are arranged on the positioning surface, two L-shaped fixing feet positioned on two sides of the positioning surface are respectively formed on two sides of the upper cover, and one side edge of each of the two L-shaped fixing feet is flush with the positioning surface.

As a preferred scheme, the connecting structure comprises two mounting bosses which are oppositely arranged at the top of the base and two mounting jacks which are correspondingly arranged on the upper cover and are in close fit connection with the fixing bosses.

As a preferred scheme, two the installation boss is located installation inner chamber's port both sides to have and extend to installation inner chamber port department's spacing wall portion, the upper cover corresponds to be equipped with the cooperation joint in installation jack one side is in the spacing fixture block of spacing wall portion bottom surface.

As a preferred scheme, the key structure comprises a key part which penetrates out of the upper cover and is in a trapezoid table shape, a touch pressing part with the bottom in the trapezoid table shape, and a limit baffle connected between the key part and the touch pressing part.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. the utility model provides a light-touch key switch, wherein a static contact piece structure consists of a first contact piece and two second contact pieces, the first contact piece and the two second contact pieces are arranged at the bottom of an installation cavity in an extending manner along the length direction of a base and respectively provided with a first output piece and a second output piece which are arranged in an extending manner along the width direction of the base, the first output piece and the second output piece are arranged on a positioning surface in a penetrating manner, a first end pin and a second end pin are attached and welded on a circuit board, and the movable contact piece structure is in contact with the two second contact pieces through two supporting contact pieces, the matching contact surface is large and is stably stressed, as long as an arc-shaped elastic piece is driven by the key structure to be in contact with the first contact piece, a conductive loop between the first contact piece and the two contact pieces can be connected, and electric signals are output through the first end pin and the second end pin The integral type structural stability is good, reduces contact resistance, and the shaping is made conveniently, has simplified mounting structure, can directly adopt integrative mode of moulding plastics to inlay and inlay on the base, and the overall arrangement mode of this kind of static contact structure is favorable to the area of contact between increase and the movable contact structure, and electric contact performance is good, promotes the electric property and the life that dabs key switch.

2. According to the light-touch key switch provided by the utility model, the two strip-shaped grooves suitable for mounting the first output sheet and the second output sheet are arranged on the two sides of the bottom of the mounting inner cavity, and one ends of the two strip-shaped grooves extend to the positioning surface.

3. In the light-touch key switch provided by the utility model, the end parts of the first end pin and the second end pin are respectively bent to extend to the lower side of the positioning surface for a certain distance, so that the first end pin and the second end pin are not completely shielded by the positioning surface, and the pasting and welding operation of the first end pin and the second end pin on a circuit board is facilitated.

4. According to the light-touch key switch provided by the utility model, the upper cover is positioned and installed on the base through the matching of the installation jack and the installation boss, the limit wall part extending to the port of the installation inner cavity is arranged according to the installation boss, and after the installation boss is inserted into the installation jack, the upper cover is clamped on the bottom surface of the limit wall part through the limit clamping block, so that the installation boss is limited to be separated from the installation jack, the limit and anti-loosening effects are realized on the upper cover, the upper cover and the base are reliably connected, the matching and the fixation are reliable, and the installation stability is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a tact key switch provided in the present invention;

FIG. 2 is a schematic plan view of the tact key switch according to the present invention;

FIG. 3 is a schematic view of a split structure of the tact key switch of the present invention;

FIG. 4 is a schematic view of a mounting structure of the conductive sheet structure of the present invention;

FIG. 5 is a schematic cross-sectional view of a tact key switch according to the present invention;

description of reference numerals: 1. a base; 11. installing an inner cavity; 12. positioning the surface; 13. a strip-shaped groove; 2. an upper cover; 21. an L-shaped fixing leg; 22. installing a jack; 3. a static contact structure; 31. a first contact piece; 32. a second contact piece; 33. a first output sheet; 34. a second output sheet; 35. a first terminal pin; 36. a second terminal pin; 4. a movable contact spring structure; 41. an arc-shaped elastic sheet; 42. supporting the contact piece; 5. mounting a boss; 51. a limiting wall part; 6. a key structure; 61. a key section; 62. a pressing part; 7. a positioning column; 8. and a limiting clamping block.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Examples

The present embodiment provides a tact key switch as shown in fig. 1 to 5, including:

a base 1 having a mounting cavity 11 and a positioning surface 12 provided at one side thereof for connecting a circuit board;

the upper cover 2 is fixed on the base 1 through a connecting structure, and a key structure 6 is movably arranged between the upper cover 2 and the base 1;

the static contact piece structure 3 comprises a first contact piece 31 extending along the length direction of the base 1 and arranged at the center of the bottom of the mounting inner cavity 11, and two second contact pieces 32 arranged on two sides of the first contact piece 31 in parallel; the first contact piece 31 is provided with a first output piece 33 extending along the width direction of the base 1, a second output piece 34 parallel to the first output piece 33 is integrally formed between the two second contact pieces 32, and the first output piece 33 and the second output piece 34 are respectively provided with a first end pin 35 and a second end pin 36 which penetrate through the positioning surface 12 at the same side;

the movable contact spring structure 4 is arranged in the installation cavity 11 and comprises an arc-shaped elastic sheet 41 and two supporting contact sheets 42, wherein the arc-shaped elastic sheet 41 is arranged opposite to the first contact sheet 31 in the vertical direction, the two supporting contact sheets 42 are positioned on two sides of the arc-shaped elastic sheet 41 and are respectively in contact with the two second contact sheets 32 in an attaching mode, and the arc-shaped elastic sheet 41 is driven by the key structure 6 to be in contact with the first contact sheet 31.

The above-mentioned embodiment is the core technical solution of this embodiment, according to the first contact piece 31 and the two second contact pieces 32 extending along the length direction of the base 1 and being arranged at the bottom of the installation cavity 11, and having the first output piece 33 and the second output piece 34 extending along the width direction of the base 1, respectively, the first end pin 35 and the second end pin 36 of the first output piece 33 and the second output piece 34 penetrating the positioning surface 12 are mounted and welded on the circuit board, and according to the movable contact piece structure 4, the two second contact pieces 32 are kept in contact with each other through the two supporting contact pieces 42, the matching contact surface is large and is stably supported by force, as long as the arc-shaped elastic piece 41 is driven by the key structure 6 to contact with the first contact piece 31, the conductive loop between the first contact piece 31 and the two contact pieces can be connected, and the electrical signals can be output through the first end pin 35 and the second end pin 36, according to this technical solution, the first contact piece 31 and the first output piece 33, and the two second contact pieces 32 and the second output piece 34 are respectively As an organic whole structural design, integral type structural stability is good, reduces contact resistance, and the shaping is made conveniently, has simplified mounting structure, can directly adopt integrative mode of moulding plastics to inlay and adorn on the base, and this kind of static contact structure 3's overall arrangement mode is favorable to increasing and the area of contact between the movable contact structure 4, and electric contact performance is good, promotes the electric property and the life that dabs key switch.

As a preferred embodiment, two strip grooves 13 suitable for mounting the first output piece 33 and the second output piece 34 are disposed on two sides of the bottom of the mounting cavity 11, and this structure is configured to perform a limiting mounting function on the first output piece 33 and the second output piece 34 through the two strip grooves 13, and reduce the mounting height of the first output piece 33 and the second output piece 34 at the bottom of the mounting cavity 11, so that the movable contact piece structure 4 does not contact the first output piece 33 and the second output piece 34, and one end of each of the two strip grooves 13 extends to the positioning surface 12, so that the first end pin 35 and the second end pin 36 extend out of one end of each of the two strip grooves 13 and are disposed on the same side as the positioning surface 12. The light-touch key switch is operated by side pressing, and when the light-touch key switch is installed, the positioning surface 12 and the two end pins are only required to be attached to a circuit board, and the two end pins are attached to the circuit board in a welding mode, so that the light-touch key switch can be electrically connected with the circuit board.

As a specific structure, as shown in fig. 3-4, one end of the first contact piece 31 is integrally connected to the first output piece 33, and one ends of the two second contact pieces 32 are respectively integrally connected to the second output pieces 34; the first contact piece 31 and the first output piece 33, and the second contact piece 32 and the second output piece 34 are respectively embedded in the base 1 through integral injection molding, that is, the first output piece 33 and the second output piece 34 are embedded in the two strip-shaped grooves 13 in an insert injection molding mode, so that the binding force between the first output piece 33 and the second output piece 34 and the base is increased, and the first contact piece 31 and the second contact piece 32 are ensured to be stable in the installation position of the installation cavity 11, and the advantages of short molding and processing period, high production efficiency and good structural stability are achieved. The end portions of the first terminal pin 35 and the second terminal pin 36 are bent to extend to the lower side of the positioning surface 12 for a certain distance, so that the first terminal pin 35 and the second terminal pin 36 are not completely covered by the positioning surface 12, which is beneficial for the paste welding operation of the first terminal pin 35 and the second terminal pin 36 on the circuit board.

As shown in fig. 2-4, the movable contact spring structure 4 includes two separation holes disposed between two supporting contact springs 42 and the arc-shaped elastic sheet 41, the two supporting contact springs 42 are in a concave structure, and a height difference is formed between the supporting contact springs 42 and the arc-shaped elastic sheet 41, so that the two supporting contact springs 42 are just in contact with the two second contact springs 32, and the arc-shaped elastic sheet 41 has a certain triggering distance from the first contact spring 31, and is in pressing contact with the first contact spring 31 when the arc-shaped elastic sheet 41 is elastically deformed by pressure. In order to connect the two ends of the movable contact spring structure 4 in the installation cavity 11 in a positioning manner, a clamping table structure or a clamping groove structure is relatively arranged on the side wall of the installation cavity 11, so that the two ends of the movable contact spring structure 4 bent in an arc shape are respectively positioned and abutted against the clamping table structure or the clamping groove structure, and thus the two ends of the movable contact spring structure 4 are prevented from being abutted against and contacted with the first output piece 33 or the second output piece 34.

In order to guarantee the installation stability of the light touch key switch on the circuit board, two positioning columns 7 are arranged on the positioning surface 12, two L-shaped fixing pins 21 located on two sides of the positioning surface 12 are formed on two sides of the upper cover 2 respectively, one side edge of each of the two L-shaped fixing pins 21 is flush with the positioning surface 12, and the structure is arranged, so that when the base is used for attaching the positioning surface 12 to the circuit board, the two positioning columns 7 are correspondingly inserted into the insertion holes of the circuit board to play a role in positioning and installation, and then the two L-shaped fixing pins 21 are welded and fixed on the circuit board when the two end pins are welded, the installation structure strength of a product is enhanced, and the installation stability is good.

In this embodiment, as shown in fig. 5, according to the above-mentioned upper cover 2 and the base are kept fixedly connected through a connection structure, the connection structure includes two installation bosses 5 oppositely disposed on the top of the base 1, and two installation insertion holes 22 correspondingly disposed on the upper cover 2 and forming a tight fit connection with the installation bosses, and the upper cover 2 and the base are kept fixed in relative position through the cooperation of the installation bosses 5 and the installation insertion holes 22. In order to further improve the installation steadiness between upper cover 2 and the base, two installation boss 5 is located the port both sides of installation inner chamber 11 to have and extend to spacing wall portion 51 of installation inner chamber 11 port department, upper cover 2 corresponds to be equipped with the cooperation joint in installation jack 22 one side spacing fixture block 8 of spacing wall portion 51 bottom surface, this kind of structural design, when installation boss 5 inserts completely behind installation jack 22, upper cover 2 passes through spacing fixture block 8 joint in spacing wall portion 51 bottom surface to restriction installation boss 5 deviates from installation jack 22, plays spacing locking effect to upper cover 2, makes upper cover 2 and base 1 keep reliably being connected, and the cooperation is fixed reliable, and installation stability is good.

As a preferred embodiment, the key structure 6 includes a key portion 61 that protrudes outside the upper cover 2 and is in a trapezoid table shape, a pressing portion 62 that is arranged at the bottom of the key portion 61 and is in a trapezoid table shape, and a limit baffle connected between the key portion 61 and the pressing portion 62, the upper cover 2 is provided with a through hole through which the key portion 61 can protrude, and the through hole is abutted by the limit baffle to the inner side of the through hole, so as to limit the key structure 6 from coming out between the upper cover 2 and the base 1, and ensure the reliability of the operation of the key structure.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A tact key switch, comprising:

a base (1) having an installation cavity (11) and a positioning surface (12) provided at one side thereof for connecting a circuit board;

the upper cover (2) is fixed on the base (1) through a connecting structure, and a key structure (6) is movably arranged between the upper cover (2) and the base (1);

the static contact piece structure (3) comprises a first contact piece (31) extending along the length direction of the base (1) and arranged at the center of the bottom of the installation inner cavity (11), and two second contact pieces (32) arranged on two sides of the first contact piece (31) in parallel; the first contact piece (31) is provided with a first output piece (33) extending and forming along the width direction of the base (1), a second output piece (34) parallel to the first output piece (33) is integrally formed between the two second contact pieces (32), and the first output piece (33) and the second output piece (34) are respectively provided with a first end pin (35) and a second end pin (36) which penetrate through the positioning surface (12) at the same side;

the movable contact piece structure (4) is arranged in the installation inner cavity (11) and comprises an arc-shaped elastic piece (41) and two supporting contact pieces (42), wherein the arc-shaped elastic piece (41) is vertically and oppositely arranged with the first contact piece (31), the two supporting contact pieces (42) are positioned on two sides of the arc-shaped elastic piece (41) and are respectively in contact with the two second contact pieces (32), and the arc-shaped elastic piece (41) is in contact with the first contact piece (31) under the driving of the key structure (6).

2. The tact key switch according to claim 1, wherein: the bottom both sides of installation inner chamber (11) are provided with and are fit for the installation two bar groove (13) of first output piece (33) and second output piece (34), two bar groove (13) one end extends to on locating surface (12), so that first end foot (35) and second end foot (36) with locating surface (12) homonymy sets up.

3. The tact key switch according to claim 2, wherein: one end of the first contact piece (31) is integrally connected to the first output piece (33), and one ends of the two second contact pieces (32) are respectively and integrally connected to the second output piece (34); the first contact piece (31) and the first output piece (33) as well as the second contact piece (32) and the second output piece (34) are respectively embedded in the base (1) through integral injection molding.

4. The tact key switch according to claim 3, wherein: the end parts of the first end pin (35) and the second end pin (36) are respectively bent and extend to the lower side of the positioning surface (12) for a certain distance.

5. The tact key switch according to claim 1, wherein: the two supporting contact pieces (42) are of concave structures, and a height difference is formed between the supporting contact pieces (42) and the arc-shaped elastic pieces (41).

6. The tact key switch according to claim 5, wherein: the side wall of the installation inner cavity (11) is relatively provided with a clamping table structure or a clamping groove structure, so that two ends of the movable contact spring structure (4) which are bent in an arc shape are respectively positioned and abutted against the clamping table structure or the clamping groove structure.

7. The tact key switch according to claim 1, wherein: be provided with two reference column (7) on locating surface (12), upper cover (2) both sides shaping respectively have and are located two L shape fixed foot (21) of locating surface (12) both sides, one side of two L shape fixed foot (21) with locating surface (12) parallel and level.

8. The tact key switch according to any one of claims 1 to 7, wherein: the connecting structure comprises two mounting bosses (5) which are oppositely arranged at the top of the base (1) and two mounting insertion holes (22) which are correspondingly arranged on the upper cover (2) and are connected with the fixing bosses in a tight fit manner.

9. The tact key switch according to claim 8, wherein: two installation boss (5) are located the port both sides of installation inner chamber (11), and have and extend to spacing wall portion (51) of installation inner chamber (11) port department, upper cover (2) correspond in installation jack (22) one side and are equipped with the cooperation joint and be in spacing fixture block (8) of spacing wall portion (51) bottom surface.

10. The tact key switch according to claim 9, wherein: the key structure (6) comprises a key part (61) which penetrates and extends out of the upper cover (2) and is in a trapezoid table shape, a pressing part (62) which is arranged at the bottom of the key part and is in a trapezoid table shape, and a limit baffle connected between the key part (61) and the pressing part (62).