CN211980475U

CN211980475U - DOME membrane switch button

Info

Publication number: CN211980475U
Application number: CN202021090645.6U
Authority: CN
Inventors: 金新奇
Original assignee: Hubei Changqi Electronic Technology Co ltd
Current assignee: Hubei Changqi Electronic Technology Co ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-11-20
Anticipated expiration: 2030-06-12

Abstract

The utility model provides a DOME membrane switch key, which comprises a back glue layer, a printed circuit layer, a first isolation layer, a second isolation layer and a surface film layer which are sequentially and tightly connected from bottom to top; the upper surface of the printed circuit layer is provided with a contact, and a strip-shaped through hole is formed above the contact on the first isolating layer; a trigger reed is arranged in the strip-shaped through hole, a convex block is arranged on the lower surface of one end of the trigger reed, and the trigger reed is made of an iron-copper-plated material; a second through hole is formed in the second isolation layer, a permanent magnet is clamped in the second through hole and can completely cover the strip-shaped through hole, a third through hole is formed in the permanent magnet and is communicated with the strip-shaped through hole, a push rod is inserted into the third through hole, and the upward and downward movement of the push rod can push the reed to move; the mask layer is provided with a bulge, the inner top of the bulge is fixedly connected with a pressing sheet, and the pressing sheet is made of hard materials. The utility model has the advantages of high sensitivity, long service life and the like.

Description

DOME membrane switch button

Technical Field

The utility model belongs to the technical field of electronic information, concretely relates to DOME membrane switch button.

Background

The DOME membrane switch key is a PET thin sheet (including metal spring pieces also called metal DOME) with contacts, is used as a switch on circuit boards such as PCBs, FPCs and the like, and plays an important role of a touch switch between a user and an instrument. Compared with the traditional silica gel key, the thin film key has better hand feeling, and can indirectly improve the production efficiency of various switches using the conductive film; the structure is precise, the appearance is beautiful, and the sealing performance is good. Has the characteristics of moisture resistance, long service life and the like. The contact on the film key is positioned at the conductive part (mostly above the golden finger on the circuit board) on the PCB, when the key is pressed by external force, the central point of the contact is concave and contacts with the circuit on the PCB, thereby forming a loop, the current passes through, and the whole product can work normally. The method is widely applied to the fields of electronic communication and electronic measurement instruments, industrial control, medical equipment, automobile industry, intelligent toys, household appliances and the like.

However, in the conventional DOME membrane switch key, the size of the DOME sheet determines the size of the key operation area; when the key is too large or the operation area is too large, the sheet cannot meet the requirement of the overlarge operation area.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to design a DOME membrane switch button, through optimizing membrane switch's inner structure, make it have bigger operating area.

The purpose of the utility model can be realized by the following technical proposal: a DOME membrane switch key is characterized in that the DOME membrane switch key comprises a back glue layer, a printed circuit layer, a first isolation layer, a second isolation layer and a surface film layer which are sequentially and tightly connected from bottom to top; the upper surface of the printed circuit layer is provided with a contact, and a strip-shaped through hole is formed in the first isolation layer above the contact; a trigger reed is arranged in the strip-shaped through hole, a convex block is arranged on the lower surface of one end of the trigger reed, and the trigger reed is made of an iron-copper-plated material; a second through hole is formed in the second isolation layer, a permanent magnet is clamped in the second through hole and can completely cover the strip-shaped through hole, a third through hole is formed in the permanent magnet and is communicated with the strip-shaped through hole, a push rod is inserted in the third through hole, and the trigger reed can be pushed to move by the up-and-down movement of the push rod; the mask layer is provided with a bulge, the inner top of the bulge is fixedly connected with a pressing sheet, and the pressing sheet is made of hard materials.

This DOME membrane switch button closely accords with the structure for the multilayer, and protruding inside has been full of nitrogen gas, so makes protruding have good resilience after being pressed, can protect its interior components and parts not corroded well, makes its structure rigorous, and the appearance is pleasing to the eye, and the leakproofness is good, has characteristics such as dampproofing, long service life. When the DOME membrane switch key is not pressed, the trigger reed in the DOME membrane switch key is always kept in a state of being tightly attached to the permanent magnet under the action of the bump and the permanent magnet; when the fingers of an operator press downwards at any position of the bulge, the pressing sheet inclines or moves downwards, the ejector rod is positioned at the center of the lower surface of the pressing sheet, and the ejector rod can move downwards due to the fact that the pressing sheet inclines or moves downwards, so that one end of the trigger reed moves downwards to contact with the contact and give an electric signal; when the trigger is triggered, the pressing position is not limited to the positions of the ejector rod and the contact, and the operation area can be increased through the size of the pressing sheet, so that the trigger has a larger operation area. In the DOME membrane switch key, the lever principle (the pressing sheet, the ejector rod and the triggering reed) is utilized twice, so that the DOME membrane switch key can be triggered under a smaller pressing stroke, and the DOME membrane switch key has the characteristic of high sensitivity. The back glue layer is arranged at the bottom of the DOME membrane switch key, so that people can conveniently install the DOME membrane switch key on a required electric appliance, and the DOME membrane switch key is very convenient to use.

The utility model discloses the advantage:

1. this DOME membrane switch button closely accords with the structure for the multilayer, and protruding inside has been full of nitrogen gas, so makes protruding have good resilience after being pressed, can protect its interior components and parts not corroded well, makes its structure rigorous, and the appearance is pleasing to the eye, and the leakproofness is good, has characteristics such as dampproofing, long service life.

2. When the DOME membrane switch key is triggered, the pressing position is not limited to the positions of the ejector rod and the contact, and the operation area can be increased through the size of the pressing sheet, so that the DOME membrane switch key has a larger operation area.

3. In the DOME membrane switch key, the principle of a seesaw (a pressing sheet, an ejector rod and a triggering reed) is utilized twice, so that the DOME membrane switch key can be triggered under a smaller pressing stroke, and the DOME membrane switch key has the characteristic of high sensitivity.

4. The back glue layer is arranged at the bottom of the DOME membrane switch key, so that people can conveniently install the DOME membrane switch key on a required electric appliance, and the DOME membrane switch key is very convenient to use.

Drawings

Fig. 1 is an exploded view of the three-dimensional structure of the DOME membrane switch button.

Fig. 2 is a sectional structure diagram of the DOME membrane switch key.

In the figure, 1, a back glue layer; 2. a printed circuit layer; 3. a first isolation layer; 31. a strip-shaped through hole; 4. a second isolation layer; 41. a second through hole; 5. a mask layer; 51. a protrusion; 6. triggering the reed; 61. a bump; 7. a permanent magnet; 71. a third through hole; 8. a top rod; 9. pressing the sheet.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, a DOME membrane switch key comprises a back glue layer 1, a printed circuit layer 2, a first isolation layer 3, a second isolation layer 4 and a surface film layer 5 which are tightly connected from bottom to top in sequence; the upper surface of the printed circuit layer 2 is provided with a contact, and a strip-shaped through hole 31 is formed above the contact on the first isolating layer 3; a trigger reed 6 is arranged in the strip-shaped through hole 31, a convex block 61 is arranged on the lower surface of one end of the trigger reed 6, and the trigger reed 6 is made of an iron-copper plating material; a second through hole 41 is formed in the second isolation layer 4, a permanent magnet 7 is clamped in the second through hole 41, the permanent magnet 7 can completely cover the strip-shaped through hole 31, a third through hole 71 is formed in the permanent magnet 7, the third through hole 71 is communicated with the strip-shaped through hole 31, a push rod 8 is inserted into the third through hole 71, and the trigger reed 6 can be pushed to move by the up-and-down movement of the push rod 8; the facial mask layer 5 is provided with a bulge 51, the inner top of the bulge 51 is fixedly connected with a pressing sheet 9, and the pressing sheet 9 is made of hard material.

This DOME membrane switch button closely accords with the structure for the multilayer, and protruding 51 is inside to be full of nitrogen gas, so makes protruding 51 have good resilience after being pressed, can protect the components and parts in it not corroded well, makes its structure rigorous, and the appearance is pleasing to the eye, and the leakproofness is good, has characteristics such as dampproofing, long service life. When the DOME membrane switch key is not pressed, the trigger reed 6 in the DOME membrane switch key is always kept in a state of being tightly attached to the permanent magnet 7 under the action of the bump 61 and the permanent magnet 7; when the fingers of an operator press downwards at any position of the bulge 51, the pressing sheet 9 tilts or moves downwards, the ejector rod 8 is positioned at the center of the lower surface of the pressing sheet 9, the ejector rod 8 can move downwards due to the fact that the pressing sheet 9 tilts or moves downwards, one end of the trigger reed 6 moves downwards, contacts with the contact, and gives an electric signal; when the trigger is triggered, the pressing position is not limited to the positions of the ejector 8 and the contact, and the operation area can be increased by the size of the pressing sheet 9, so that the operation area is larger. In the DOME membrane switch key, the lever principle (the pressing sheet 9, the ejector rod 8 and the trigger reed 6) is utilized twice, so that the DOME membrane switch key can be triggered in a smaller pressing stroke, and the DOME membrane switch key has the characteristic of high sensitivity. The back glue layer 1 is arranged at the bottom of the DOME membrane switch key, so that people can conveniently install the DOME membrane switch key on a required electric appliance, and the DOME membrane switch key is very convenient to use.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A DOME membrane switch key is characterized in that the DOME membrane switch key comprises a back glue layer (1), a printed circuit layer (2), a first isolation layer (3), a second isolation layer (4) and a surface film layer (5) which are sequentially and tightly connected from bottom to top; the upper surface of the printed circuit layer (2) is provided with a contact, and a strip-shaped through hole (31) is formed in the first isolation layer (3) above the contact; a trigger reed (6) is arranged in the strip-shaped through hole (31), a convex block (61) is arranged on the lower surface of one end of the trigger reed (6), and the trigger reed (6) is made of an iron copper-plated material; a second through hole (41) is formed in the second isolation layer (4), a permanent magnet (7) is connected in the second through hole (41) in a clamping mode, the permanent magnet (7) can completely cover the strip-shaped through hole (31), a third through hole (71) is formed in the permanent magnet (7), the third through hole (71) is communicated with the strip-shaped through hole (31), a push rod (8) is inserted into the third through hole (71), and the trigger reed (6) can be pushed to move by the up-and-down movement of the push rod (8); the mask layer (5) is provided with a bulge (51), the inner top of the bulge (51) is fixedly connected with a pressing sheet (9), and the pressing sheet (9) is made of hard materials.