CN216852547U

CN216852547U - Ultra-thin conductive adhesive steel sheet reinforcement pressfitting structure

Info

Publication number: CN216852547U
Application number: CN202122967960.3U
Authority: CN
Inventors: 张子云; 厉长江
Original assignee: Kunshan Complex Micro Interconnection Co ltd
Current assignee: Kunshan Complex Micro Interconnection Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-06-28
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses an ultrathin conductive adhesive steel sheet reinforcing and laminating structure which comprises a lower glass fiber cloth layer, a lower TPX layer, an FPC (flexible printed circuit) board and an upper glass fiber cloth layer, wherein the lower glass fiber cloth layer is placed at the top of a machine table; go up the fine cloth layer bottom of glass and be equipped with the last TPX layer of crimping FPC board, the surface of FPC board is equipped with a plurality of contact slots that expose the copper foil layer, the steel sheet subassembly has been placed at the top that the surface of FPC board is located the contact slot, and the steel sheet subassembly includes the steel sheet, coats in the conductive adhesive layer of steel sheet bottom, and the conductive adhesive layer corresponds the laminating with the contact slot position of FPC board, go up TPX layer high temperature high pressure and act on steel sheet and conductive adhesive layer, copper foil layer atress upwards arches contact conductive adhesive layer and solidification in the contact slot. The utility model realizes that the ultrathin conductive adhesive steel sheet avoids the problem of resistance value out of specification.

Description

Ultra-thin conductive adhesive steel sheet reinforcement pressfitting structure

Technical Field

The utility model belongs to the technical field of FPC products, and particularly relates to an ultrathin conductive adhesive steel sheet reinforcing and laminating structure.

Background

Along with electronic product's continuous upgrading, FPC board thickness is more and more thin, and corresponding reinforcement thickness also thins, can not cancel the reinforcement because of the operation requirement to special position, and the rear end of FPC board needs the reinforcement to support just can guarantee that the plug uses the number of times up to standard, avoids plug stress to cause the leg to receive the power of bending to produce tin and splits. The rear end reinforcement of the FPC board is divided into an FR4 reinforcement board and a steel sheet reinforcement board, wherein the steel sheet reinforcement board is conducted with the ground wire of the FPC board, the traditional steel sheet and the FPC are pressed by a vacuum fast press, after a period of high temperature and high pressure, the conductive adhesive on the steel sheet is bonded with the FPC, and then the adhesive is cured by baking. The vacuum fast press adopts an air bag inflation mode to generate pressure on the surface of the FPC board, and is influenced by the pressure borne by the air bag, so that the relative pressure value is limited, and the pressure is about 23kgf generally; the gasbag is made for the silica gel material, and is softer relatively, and the gasbag has the fillibility during the pressfitting, and when steel sheet thickness and FPC board thickness were close or when thinner, the plasticity of steel sheet itself is not enough, causes the slight deformation of pressfitting process steel sheet, through stove high temperature effect, the steel sheet bounce-back causes conductive adhesive and FPC's copper foil layer to take place the micro-separation on the steel sheet for conductive adhesive and FPC board contact resistance grow influence FPC board's performance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems and provides a reinforcing and laminating structure for an ultrathin conductive adhesive steel sheet, so that the problem of resistance value overstep of the ultrathin conductive adhesive steel sheet is solved. In order to achieve the purpose, the technical scheme of the utility model is as follows:

the ultrathin conductive adhesive steel sheet reinforced pressing structure comprises a lower glass fiber cloth layer placed at the top of a machine table, a lower TPX layer arranged at the top of the lower glass fiber cloth layer, a FPC (flexible printed circuit) board arranged at the top of the lower TPX layer and an upper glass fiber cloth layer arranged above the FPC board and capable of being lifted and moved; go up the fine cloth layer bottom of glass and be equipped with the last TPX layer of crimping FPC board, the surface of FPC board is equipped with a plurality of contact slots that expose the copper foil layer, the steel sheet subassembly has been placed at the top that the surface of FPC board is located the contact slot, and the steel sheet subassembly includes the steel sheet, coats in the conductive adhesive layer of steel sheet bottom, and the conductive adhesive layer corresponds the laminating with the contact slot position of FPC board, go up TPX layer high temperature high pressure and act on steel sheet and conductive adhesive layer, copper foil layer atress upwards arches contact conductive adhesive layer and solidification in the contact slot.

Specifically, the lower TPX layer and the upper TPX layer are both rigid layers made of transparent plastics.

Specifically, the plurality of contact grooves comprise L-shaped first contact grooves and T-shaped second contact grooves which are arranged at intervals.

Specifically, two ends of the steel sheet extend out of the edges of two sides of the FPC board.

Specifically, the FPC board is in an arched structure due to high-temperature compression deformation at the position of the contact groove, and the conductive adhesive layer is in high-temperature compression contact with the top end of the arched structure.

Compared with the prior art, the ultrathin conductive adhesive steel sheet reinforcement pressing structure has the following beneficial effects:

the deformation of the FPC board during pressing is increased, the plasticity of the steel sheet during pressing is guaranteed, the steel sheet is kept not to rebound and deform during pressing, the conductive adhesive layer and the copper foil layer of the FPC board are not changed, and the performance of stable contact resistance is achieved.

Drawings

FIG. 1 is a schematic view of a laminated structure before lamination according to an embodiment of the present invention;

FIG. 2 is a schematic view of a laminated structure after lamination according to the present embodiment;

FIG. 3 is a schematic view of a pressing deformation structure of the FPC board according to the present embodiment;

FIG. 4 is a schematic top view of the FPC board and the steel plate of the present embodiment;

the figures in the drawings represent:

glass fiber cloth layer under 1, TPX layer under 2, 3FPC board, 31 copper foil layer, 32 contact groove, 33 arc structures, glass fiber cloth layer on 4, TPX layer on 5, 6 steel sheets, 61 conductive adhesive layer.

Detailed Description

The technical solutions in the embodiments of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

The embodiment is as follows:

referring to fig. 1-4, the embodiment is an ultra-thin conductive adhesive steel sheet reinforced press-fit structure, which includes a lower glass fiber cloth layer 1 disposed on the top of a machine table, a lower TPX layer 2 disposed on the top of the lower glass fiber cloth layer 1, a FPC board 3 disposed on the top of the lower TPX layer 2, and an upper glass fiber cloth layer 4 disposed above the FPC board 3 and capable of being lifted and moved; go up 4 bottoms on fine cloth layer of glass and be equipped with last TPX layer 5 of crimping FPC board 3, FPC board 3's surface is equipped with a plurality of contact slots 32 that expose copper foil layer 31, the steel sheet subassembly has been placed at the top that the surface of FPC board 3 is located contact slots 32, the steel sheet subassembly includes steel sheet 6, coat in the conducting resin layer 61 of 6 bottoms of steel sheet, the conducting resin layer 61 corresponds the laminating with the contact slots 32 position of FPC board 3, go up 2 high temperature high pressure actions on steel sheet 6 and conducting resin layer 61 on the TPX layer, the contact slots 32 is upwards arched to contact conducting resin layer 61 and solidification in the 31 atress of copper foil layer.

Lower TPX layer 2 and last TPX layer 5 are the stereoplasm layer of transparent plastics, can guarantee the stability of crimping process.

In this embodiment, the FPC board 3 is 0.2mm, the conductive adhesive layer 61 is 0.04mm, and the steel sheet 6 is 0.05 mm.

Go up fine cloth layer 4 and be connected with the drive arrangement who drives TPX layer 5 on its drive, drive arrangement is conventional cylinder, or goes up fine cloth layer 4 and be fixed in the board through the mode of coupling, goes up fine cloth layer 4 swivelling joint board of glass, makes through the fine cloth layer 4 of rotatory glass go up TPX layer 5 crimping in the 6 surfaces of steel sheet. The pressure of the upper glass fiber cloth layer 4 was controlled to be 100kgf and the temperature was 185 ℃.

The surface of the FPC board 3 is provided with a plurality of contact grooves 32 which remove the protective layer and expose the copper foil layer 31, and the contact grooves 32 comprise L-shaped first contact grooves and T-shaped second contact grooves which are arranged at intervals. Two ends of the steel sheet 6 extend out of the two side edges of the FPC board 3.

The FPC board 3 is deformed under high temperature pressure at the position of the contact groove 32 into an upwardly arched structure 33. The layer of conductive adhesive 61 is in high temperature compressive contact with the top of the arcuate structure 33.

When the embodiment is applied, the steel sheet assembly is placed on the FPC board 3, the upper glass fiber cloth layer 4 drives the upper TPX layer 5 to be in compression joint with the steel sheet, the steel sheet 6 keeps not deformed, and when the steel sheet is subjected to SMT high-temperature furnace temperature, deformation occurs at high temperature due to ductility of the copper foil layer 31 of the FPC board 3, the upper TPX layer 5 is stable when being in contact with the steel sheet 6 made of hard materials, the contact resistance value is not changed due to the fact that the conductive adhesive layer 61 on the steel sheet 6 is not changed when being in contact with the copper foil layer 31 of the FPC board 3.

In this embodiment, the deformation of the FPC board 3 during pressing is increased, so that the plasticity of the steel sheet 6 during pressing is ensured, the steel sheet 6 is kept from rebounding and deforming during pressing, the conductive adhesive layer 61 and the copper foil layer 31 of the FPC board 3 are not changed, and the stable contact resistance is achieved.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the utility model.

Claims

1. Ultra-thin conducting resin steel sheet reinforcement pressfitting structure, its characterized in that: the glass fiber cloth layer is arranged on the top of the machine table, the lower TPX layer is arranged on the top of the lower glass fiber cloth layer, the FPC board is arranged on the top of the lower TPX layer, and the upper glass fiber cloth layer is arranged above the FPC board and can be lifted and moved; go up the fine cloth layer bottom of glass and be equipped with the last TPX layer of crimping FPC board, the surface of FPC board is equipped with a plurality of contact slots that expose the copper foil layer, the steel sheet subassembly has been placed at the top that the surface of FPC board is located the contact slot, and the steel sheet subassembly includes the steel sheet, coats in the conductive adhesive layer of steel sheet bottom, and the conductive adhesive layer corresponds the laminating with the contact slot position of FPC board, go up TPX layer high temperature high pressure and act on steel sheet and conductive adhesive layer, copper foil layer atress upwards arches contact conductive adhesive layer and solidification in the contact slot.

2. The ultra-thin conductive adhesive steel sheet reinforcement pressing structure of claim 1, characterized in that: and the lower TPX layer and the upper TPX layer are both hard layers made of transparent plastics.

3. The ultra-thin conductive adhesive steel sheet reinforcement pressing structure of claim 1, characterized in that: the plurality of contact grooves comprise L-shaped first contact grooves and T-shaped second contact grooves which are arranged at intervals.

4. The ultra-thin conductive adhesive steel sheet reinforcement pressing structure of claim 1, which is characterized in that: two ends of the steel sheet extend out of the edges of two sides of the FPC board.

5. The ultra-thin conductive adhesive steel sheet reinforcement pressing structure of claim 1, which is characterized in that: the FPC board is in an arched arc structure due to high-temperature compression deformation at the position of the contact groove, and the conductive adhesive layer is in high-temperature compression contact with the top end of the arc structure.