CN212516990U

CN212516990U - Light touch on type keyboard membrane switch

Info

Publication number: CN212516990U
Application number: CN202021486286.6U
Authority: CN
Inventors: 陆一兵; 姚应海
Original assignee: Nanjing Continental Hao Film Switch Technology Co Ltd
Current assignee: Nanjing Continental Hao Film Switch Technology Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-02-09
Anticipated expiration: 2030-07-24

Abstract

The utility model provides a light touch on-type keyboard membrane switch, including the membrane switch main part, the membrane switch main part includes the bottom plate, be equipped with the PCB board on the bottom plate, be equipped with protruding fixed contact on the PCB board, still be equipped with the insulating platform on the PCB board, be equipped with the spacing groove on the insulating platform; a spring is arranged on the periphery of the fixed contact, the top end of the spring is clamped on an elastic sheet contact, the elastic sheet contact is arranged on a metal elastic sheet, limiting blocks are arranged at two ends of the metal elastic sheet, and the limiting blocks are arranged in the limiting grooves; the metal elastic sheet upper layer is provided with a flexible circuit sheet, the flexible circuit sheet upper layer is provided with a flexible film for water and moisture prevention, the flexible film upper layer is provided with a rubber cap, the rubber cap top layer is provided with a plastic top plate, the plastic top plate is provided with a round hole, the protruding part of the rubber cap penetrates into the round hole, and the plastic top plate is further provided with a hook-shaped elastic sheet.

Description

Light touch on type keyboard membrane switch

Technical Field

The utility model belongs to the technical field of the membrane switch, concretely relates to dab switch-on formula keyboard membrane switch.

Background

The membrane switch is also called a touch keyboard, adopts an integral sealing structure formed by combining a plurality of layers of planes, is a novel electronic component integrating light collection, electricity and machines by sealing a key switch, a panel, a mark, a symbol display and a lining plate together, has the advantages of good sealing performance, light weight, small volume, low voltage and low current, water resistance, dust resistance, long service life and the like, is widely applied to electronic products such as office equipment, household appliances and the like, and is a fundamental change of the appearance structure of the electronic product. The membrane switch is formed by that after a plurality of touch parts respectively positioned on the inner surfaces of two opposite membranes are extruded by external force, a contact of an upper circuit deforms downwards and is in contact conduction with a polar plate of a lower circuit, so that the circuit is conducted; after the external force is removed, the upper circuit contact rebounds, the circuit is disconnected, and the loop triggers a signal, so that the switch with the expected switching function is achieved.

The existing membrane switch is usually made of rubber or plastic materials and made of elastic sheets, and because the membrane or an internal switch structure on the membrane switch is easy to damage and the elastic sheets are easy to curl and deform after the membrane switch is used for a period of time due to frequent pressing, the resilience force is reduced, so that the contact is insensitive to pressing or lifting, even the switch function is invalid, and the service life of the switch is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a dab switch-on formula keyboard membrane switch can solve current membrane switch and can produce deformation and shorten practical life's problem under long-term the use.

The utility model provides a following technical scheme:

a light-touch on-type keyboard membrane switch comprises a membrane switch main body, wherein the membrane switch main body comprises a bottom plate, a PCB is arranged on the bottom plate, a raised fixed contact is arranged on the PCB, an insulating table is further arranged on the PCB, and a limit groove is arranged on the insulating table; a spring is arranged on the periphery of the fixed contact, the top end of the spring is clamped on an elastic sheet contact, the elastic sheet contact is arranged on a metal elastic sheet, limiting blocks are arranged at two ends of the metal elastic sheet, and the limiting blocks are arranged in the limiting grooves; the metal elastic sheet upper layer is provided with a flexible circuit sheet, the flexible circuit sheet upper layer is provided with a flexible film for water and moisture prevention, the flexible film upper layer is provided with a rubber cap, the rubber cap top layer is provided with a plastic top plate, the plastic top plate is provided with a round hole, the protruding part of the rubber cap penetrates into the round hole, and the plastic top plate is further provided with a hook-shaped elastic sheet.

Preferably, the keyboard comprises a keyboard cap, a middle shaft column is arranged at the bottom of the keyboard cap, a segmented plate is arranged on the middle shaft column, and the segmented plate is clamped with the hook-shaped elastic sheet.

Preferably, the fixed contact is not in contact with the insulating block.

Preferably, the spring is an insulating spring.

Preferably, the contact surfaces of the fixed contact and the elastic sheet contact are spherical surfaces.

The utility model has the advantages that: the insulating spring is used for effectively assisting the elastic sheet to rebound, so that the problem that the switch performance is influenced due to the deformation of the elastic sheet after long-term use is avoided, the waterproof and moistureproof effects are achieved, and the service life of the membrane switch is effectively prolonged; the switch can be operated by lightly pressing, which is more beneficial to protecting the health of fingers; keyboard cap and plastics roof can dismantle, and the use scene is many.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention when no external force is applied;

FIG. 2 is a schematic view of the overall structure of the present invention when an external force is applied;

FIG. 3 is a schematic structural view of the limiting block of the present invention in two states in the limiting groove;

fig. 4 is a schematic view of the two structures of the sectional plate and the hook-shaped elastic sheet of the present invention.

Detailed Description

As shown in the figures, for the utility model provides a touch switch-on keyboard membrane switch, including the membrane switch main part, the membrane switch main part includes bottom plate 1, be equipped with PCB board 2 on bottom plate 1, be equipped with protruding fixed contact 3 on PCB board 2, the fixed contact 3 top surface is the hemisphere structure, still be equipped with insulating station 4 on PCB board 2, fixed contact 3 and insulating station 4 middle contactless, fixed contact 3 periphery is equipped with spring 6, spring 6 is insulating spring, the joint of spring 6 top is on shell fragment contact 7, shell fragment contact 7 is located on metal shrapnel 8, metal shrapnel 8 both ends are equipped with stopper 9, insulating station 4 middle is equipped with spacing groove 5, stopper 9 is located in spacing groove 5, stopper 9 can slide in spacing groove 5; the upper layer of the metal elastic sheet 8 is provided with a flexible circuit sheet 10, the upper layer of the flexible circuit sheet 10 is provided with a flexible film 11 used for water and moisture prevention, the upper layer of the flexible film 11 is provided with a rubber cap 12, the top layer of the rubber cap 12 is provided with a plastic top plate 13, the plastic top plate 13 is provided with a round hole, the protruding part of the rubber cap 12 is arranged in the round hole in a penetrating manner, and the plastic top plate 13 is further provided with a hook-shaped elastic sheet 14.

A light-touch on-type keyboard membrane switch further comprises a keyboard cap 15, a middle shaft column 16 is arranged at the bottom of the keyboard cap 15, a segmented plate 17 is arranged on the middle shaft column 16, and the segmented plate 17 is detachably clamped with a hook-shaped elastic sheet 14.

The contact surfaces of the elastic sheet contact 7 and the fixed contact 3 are spherical surfaces, so that the switch action can be finished through the fastest contact under the action of external force at any angle, the insulating spring 6 can assist the resilience of the metal elastic sheet 8 to prevent the metal elastic sheet 8 from deforming in long-term use so as to influence the service life of the switch, and can ensure that the contact angle of the elastic sheet contact 7 and the fixed contact 3 cannot generate overlarge offset; the insulating spring 6 and the metal elastic sheet 8 are combined for use, so that the hardness of the metal elastic sheet 8 can be properly reduced, and the pressure of the key is relieved; the plastic top plate 13 can be detached, the rubber cap 13 and the lower layer part of the rubber cap 13 are directly used, external force directly acts on the rubber cap 13, and the pressing pressure can be further reduced without the plastic top plate 13 and the keyboard cap 15; the flexible film 11 can effectively prevent moisture and water, and prevent the switch from being damaged due to moisture.

Along with the keyboard cap 15 is pressed downwards by force, the clamping point of the segmented plate 17 and the hook-shaped elastic sheet 14 is staggered, so that the middle shaft column 16 presses the rubber cap 12 penetrating through the round hole in the plastic top plate 13 downwards, the pressure is transmitted to the flexible film 11 and the flexible circuit sheet 10 through the rubber cap 12 in sequence and is finally transmitted to the metal elastic sheet 8, the metal elastic sheet 8 deforms by force, the limiting block 9 slides towards two ends along the limiting groove 5, the elastic sheet contact 7 on the metal elastic sheet 8 compresses the insulating spring 6 and contacts with the top end of the fixed contact 3 to form a closed loop, and the opening action of the switch is completed; after the external force is cancelled, the metal elastic sheet 8 returns to the bending state under the combined action of the tension of the elastic extension of the insulating spring 6 and the resilience force of the metal elastic sheet 8, the elastic sheet contact 7 compresses the insulating spring 6 to be separated from the fixed contact 3, the circuit is disconnected, and the closing action of the switch is completed.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The light-touch switch-on keyboard membrane switch is characterized by comprising a membrane switch main body, wherein the membrane switch main body comprises a bottom plate (1), a PCB (2) is arranged on the bottom plate (1), a raised fixed contact (3) is arranged on the PCB (2), an insulating table (4) is further arranged on the PCB (2), and a limiting groove (5) is arranged on the insulating table (4); a spring (6) is arranged on the periphery of the fixed contact (3), the top end of the spring (6) is clamped on the elastic sheet contact (7), the elastic sheet contact (7) is arranged on the metal elastic sheet (8), limiting blocks (9) are arranged at two ends of the metal elastic sheet (8), and the limiting blocks (9) are arranged in the limiting grooves (5); the waterproof and moistureproof plastic spring plate is characterized in that a flexible circuit sheet (10) is arranged on the upper layer of the metal spring plate (8), a flexible film (11) used for waterproof and moistureproof is arranged on the upper layer of the flexible circuit sheet (10), a rubber cap (12) is arranged on the upper layer of the flexible film (11), a plastic top plate (13) is arranged on the top layer of the rubber cap (12), a round hole is formed in the plastic top plate (13), a protruding part of the rubber cap (12) penetrates through the round hole, and a hook-shaped spring plate (14) is further arranged on the plastic top plate (13).

2. The light touch on-type keyboard membrane switch according to claim 1, further comprising a keyboard cap (15), wherein a central shaft column (16) is arranged at the bottom of the keyboard cap (15), a segmented plate (17) is arranged on the central shaft column (16), and the segmented plate (17) is clamped with the hook-shaped elastic sheet (14).

3. The membrane switch of the touch-on keyboard according to claim 1, characterized in that there is no contact between the fixed contact (3) and the insulating stage (4).

4. The light touch on keyboard membrane switch according to claim 1, characterized in that the spring (6) is an insulating spring.

5. The membrane switch of claim 1, wherein the contact surfaces of the fixed contact (3) and the dome contact (7) are spherical.