CN106847590A - A kind of preparation method of film key switch and thin-film key panel - Google Patents
A kind of preparation method of film key switch and thin-film key panel Download PDFInfo
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- CN106847590A CN106847590A CN201710247388.9A CN201710247388A CN106847590A CN 106847590 A CN106847590 A CN 106847590A CN 201710247388 A CN201710247388 A CN 201710247388A CN 106847590 A CN106847590 A CN 106847590A
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- layer
- screen
- film key
- thin
- half tone
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
- H01H13/14—Operating parts, e.g. push-button
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0254—High voltage adaptations; Electrical insulation details; Overvoltage or electrostatic discharge protection ; Arrangements for regulating voltages or for using plural voltages
- H05K1/0257—Overvoltage protection
- H05K1/0259—Electrostatic discharge [ESD] protection
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Push-Button Switches (AREA)
Abstract
The invention discloses a kind of film key switch and the preparation method of thin-film key panel, thin-film key panel of the film key switch by printed circuit board (PCB) and covering on a printed circuit is constituted；Printed circuit board (PCB) is followed successively by ground plane, bus plane and some signals layers from the bottom to top；TVS power supply protectors are connected between ground plane and bus plane；ESD electrostatic impedors are connected between the ground plane and some signals layers；Thin-film key panel is from top to bottom followed successively by：First protective layer, antistatic backing, pet substrate, patterned layer, screen layer, the second protective layer, conductive adhesive layer and button bed course；The ground plane of the printed circuit board (PCB) is connected with the screen layer of thin-film key panel and antistatic backing.The present invention using between bus plane and ground plane and connect TVS power protection devices come reduce moment produce electromagnetic interference; using between holding wire and ground wire and connecing ESD electrostatic impedors and reducing the electrostatic phenomenon produced because touch is acted on, protection button thin film switch is protected in itself.
Description
Technical field
The present invention relates to a kind of film key switch and the preparation method of thin-film key panel.
Background technology
It is easy to operate and attractive in appearance big bringing using film key switch as guidance panel on current many electronic products
While square, the problem of electromagnetic shielding and electrostatic interference is also encountered：On the one hand because film key switch leaves largely in itself
Space, the shielding of this electron product brings the circuit and component of very big problem, another aspect switch sections easily to receive
The interference of radio frequency and electrostatic, causes the misoperation of operation, therefore it is particularly critical to solve its shielding problem.
The content of the invention
First purpose of the invention is to provide a kind of film key switch.
The technical scheme for realizing first purpose of the invention is a kind of film key switch, by printed circuit board (PCB) and is covered in
Thin-film key panel composition on printed circuit board (PCB)；
The printed circuit board (PCB) is followed successively by ground plane, bus plane and some signals layers from the bottom to top；The ground plane and electricity
TVS power supply protectors are connected between active layer；ESD electrostatic impedors are connected between the ground plane and some signals layers；
The thin-film key panel is from top to bottom followed successively by：First protective layer, antistatic backing, pet substrate, patterned layer, screen
Cover layer, the second protective layer, conductive adhesive layer and button bed course；First protective layer, antistatic backing, pet substrate, patterned layer,
One transparent window is set on screen layer, the second protective layer and conductive adhesive layer；The antistatic backing, pet substrate, patterned layer, screen
Cover and at least one technique via is set on layer, the second protective layer and conductive adhesive layer, antistatic backing, screen layer and conductive adhesive layer are connected
Connect；
The ground plane of the printed circuit board (PCB) is connected with the screen layer of thin-film key panel and antistatic backing.
The antistatic backing is electrically conducting transparent ink；First protective layer and the second protective layer are UV ink；The screen
Layer is covered for silver paste.
Each layer of the conductive adhesive layer area more than portion disposed thereon.
Second object of the present invention is to provide a kind of preparation method of thin-film key panel.
The technical scheme for realizing second purpose of the invention is a kind of preparation method of thin-film key panel, including following step
Suddenly：
Step one：Determine the structure of thin-film key panel；
Step 2：Prepare PET base material, and the printing pattern layer in PET base material；
Step 3：Screen layer is made in patterned layer；
Step 4：Antistatic backing is made using silk-screen printing in the another side of PET base material；
Step 5：The second protective layer is covered on the shielding layer；The first protective layer is covered on antistatic backing；In the second protection
Conductive adhesive layer and button bed course are pasted on layer successively.
The specific method of the step 2 is：Printing color ink obtains patterned layer in the thick PET base materials of 0.2mm, passes through
98 DEG C of ± 2 DEG C of hot drying tunnel 2.5min preliminary drying dry-cure are crossed, then the colored ink face cladding thickness in patterned layer is 0.06mm indigo plants
Color LK-820B diaphragms；
The specific way of the step 3 is：
A, the material that step 2 is obtained is delivered into puncher, punch and obtain diameter 2mm location holes；
B, punched material is sent to laser cutting machine, is aligned using location hole on laser cutting machine, the company of cutting out
The technique via of the positive and negative conductive materials of PET base material is connect, screen process press is delivered to after the completion of cutting；
C, the half tone equipped with shielding layer pattern is changed on screen process press, the spacing of half tone and printing machine platform for 4~
5mm；
D, scraper from shore hardness be 70 degree of perpendicular type frictioning, and on screen process press doctor blade holder with half tone into
75 degree of angles；It is left in half tone from solid content 59%, density 1.84kg/L, viscosity 4600~7400, the silver paste of 100~200g of weight
Side, the returning blade tool on operation screen process press, uniformly silver paste is bulldozed on half tone；
E, half tone take the PET material that step b is obtained after rising, and colored ink is faced up and is placed in silk-screen printing machine table top,
The blue LK-820B diaphragms on PET are held using the wind inlet on table top, and it is with dedusting roller that the dust of material surface is clear
Except clean；
F, operation screen process press put down half tone, move scraper, and conductive silver paste passes through the area of the pattern on half tone, in pattern
The colored ink face of layer leaves screen layer；
G, stopping air draught, 98 DEG C of ± 2 DEG C of hot drying tunnels are moved on to from printing table by the PET sheet material with patterned layer and screen layer
Conveyer belt on, be placed on net car by after 3.5min preliminary drying dry-cure.
In the step 3, the circular hole of a diameter of 0.12mm of technique via, the pattern of screen layer is line width 1.0mm, line
Sky compares 1：4.2 rectangular mesh.
The specific method of the step 4 is：
A, the half tone equipped with antistatic backing pattern is changed on screen process press, the spacing of half tone and printing machine platform for 4~
5mm；
B, from scraper shore hardness be 70 degree of perpendicular type frictioning, be installed on screen process press doctor blade holder and half tone
Into 70 degree of angles；From 15~60dPas of viscosity, the electrically conducting transparent ink of sheet resistance value≤700ohm, in centrifuge with 1500 turns/
Minute stirring is used after 30 minutes, then operates the uniform electrically conductive ink that is bulldozed on half tone of the returning blade on screen process press to starch；
C, half tone take the PET sheet material that step 3 is obtained after rising, and screen layer is placed in silk-screen printing machine table top down, using platform
Wind inlet on face holds PET, and is removed the dust of material surface with dedusting roller clean；
E, operation screen process press put down half tone, and mobile scraper, electrically conducting transparent ink slurry passes through the area of the pattern on half tone,
The pattern of antistatic backing is left on PET base material surface；
F, stopping air draught moving on to PET sheet material on 98 DEG C of conveyer belts of ± 2 DEG C of hot drying tunnels from printing table, pre- by 2min
It is placed into after drying and processing on net car；
G, the panel that will be molded send into 130 DEG C ± 3 DEG C of oven heat baking, wait 30min curing process；After heat cure
The surface of PET sheet material is the anti-quiet layer to be formed；
H, test whether PET base material two sides has been turned on resistance measuring instrument, the panel for passing through will be tested and be re-fed into 130 DEG C
± 3 DEG C of oven heat baking, wait 20min curing process；PET base material front is the thickness of full paving for 4um is transparent after heat cure
The antistatic backing of conductive materials, the back side is that thickness is the screen layer of 6um silver paste grids.
After employing above-mentioned technical proposal, present invention offers following beneficial effect：(1) present invention is using in bus plane
Between ground plane and connect TVS power protections device and reduce the electromagnetic interference of moment generation, using holding wire and ground wire it
Between and connect ESD electrostatic impedors come reduce due to touch act on and produce electrostatic phenomenon；Ensure circuit element below from
The impact of transient state high-energy and damage, it is to avoid electrostatic belt come maloperation or button malfunction, protect protection button film open
Pass is in itself.
(2) present invention by antistatic backing, screen layer and conductive adhesive layer by being arranged on multiple technique mistakes of button frame surrounding
Hole is connected, then is connected with metal chassis by conductive adhesive layer so that and equipment monolithic case forms a tight shielding cavity, makes
The component obtained in chamber is subject to Global Macros, can guarantee that component steady production under the conditions of no radio frequency and electrostatic interference.
(3) present invention sets one layer of button bed course between printed circuit board (PCB) and thin-film key panel, can isolate conduction
Copper Foil signals layer on glue-line and circuit board.
(4) technique of the invention can guarantee that effectiveness, with high conductivity and electromagnetic shielding efficiency high, by control
The species of wire printing material processed, thickness, linear and shape reach the shield effectiveness to different wave frequencies.
(5) antistatic backing of the invention employs transparent conductive coating silk-screen in transparent window area, both meets viewfinder area
Display effect, while the efficiency of antistatic can also be reached.
(6) technique of the invention significantly reduces the manufacturing cost of film key switch, is suitable to produce in enormous quantities, can answer
For the EMI shieldings of Aero-Space, mine ocean and fine measuring instrument equipment operation key panel.
Brief description of the drawings
In order that present disclosure is easier to be clearly understood, it is right below according to specific embodiment and with reference to accompanying drawing
The present invention is described in further detail, wherein
Fig. 1 is the front view of film key switch of the invention.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is circuit diagram of the invention.
In accompanying drawing marked as：
Printed circuit board (PCB) 1, ground plane 11, bus plane 12, some signals layers 13, thin-film key panel 2, the first protective layer
21st, antistatic backing 22, pet substrate 23, patterned layer 24, screen layer 25, the second protective layer 26, conductive adhesive layer 27, button bed course 28,
Transparent window 29, technique via 210, button 211.
Specific embodiment
(embodiment 1)
See Fig. 1 and Fig. 2, a kind of film key switch of the present embodiment by printed circuit board (PCB) 1 and is covered in printed circuit board (PCB)
Thin-film key panel 2 on 1 is constituted；Printed circuit board (PCB) 1 is followed successively by ground plane 11, bus plane 12 and some signals layers from the bottom to top
13.Thin-film key panel 2 is from top to bottom followed successively by：First protective layer 21, antistatic backing 22, pet substrate 23, patterned layer 24, screen
Cover layer 25, the second protective layer 26, conductive adhesive layer 27 and button bed course 28；In the first protective layer 21, antistatic backing 22, pet substrate
The 23rd, one transparent window 29 is set on patterned layer 24, screen layer 25, the second protective layer 26 and conductive adhesive layer 27；Antistatic backing 22,
At least one technique via is set on pet substrate 23, patterned layer 24, screen layer 25, the second protective layer 26 and conductive adhesive layer 27
210, antistatic backing 22, screen layer 25 and conductive adhesive layer 27 are connected；Antistatic backing 22 is electrically conducting transparent ink；First protective layer
21 and second protective layer 26 be UV ink；Screen layer 25 is silver paste.The area of conductive adhesive layer 27 is used more than each layer in portion disposed thereon
In with chassis contact.
See Fig. 3, TVS power supply protectors are connected between ground plane 11 and bus plane 12；Ground plane 11 and some signals layers 13
Between connect ESD electrostatic impedors；The ground plane 11 of printed circuit board (PCB) 1 and the screen layer 25 of thin-film key panel 2 and antistatic
Layer 22 is connected.The ground plane 11 of printed circuit board (PCB) 1, bus plane 12 and some signals layers 13 are all conductive, face many interference,
The Hz noise of 50HZ is there are on bus plane 12, the different interference signal of all kinds of frequency contents can be sealed on signals layer 13,
For bus plane, using between bus plane and ground plane and TVS power protection devices are connect, because transient high voltages and electric current are done
It is the main cause for causing circuit to damage to disturb.Using TVS it is a kind of good electromagnetism interference means in film key switch.
When TVS power supply protectors two ends are subject to moment high energy impact events, it can be made with high speed (up to 1/ (10^12) second)
Its impedance is reduced suddenly, while interference electric current is absorbed, by its both end voltage clamp in a predetermined value, so that it is guaranteed that below
Circuit element is damaged from interference impact.Try one's best ground wire cloth is wide in wiring or ground is filled up in the place of leaving a blank of printed circuit board (PCB)
Line, to reduce interference that conductor resistance produces in itself or the place of leaving a blank is processed as screen layer.For signal line layer, using
Between holding wire and ground wire and connect ESD electrostatic impedors, on the surface of film key switch, due to touch effect, will produce
Electrostatic phenomenon；Due to potential difference can be produced on button wire, the device breakdown being connected on the lead can be caused to damage.Using
ESD electrostatic impedors eliminate the electrostatic effect of key switch panel, and effect is fine.To be tried one's best low-and high-frequency in cloth holding wire
Signal is separated, and modulus signal is separate, to avoid various types of signal from interfering.
Preparation method on thin-film key panel, is also the key of the present embodiment.Comprise the following steps：
Step one：Determine the structure of thin-film key panel 2 as depicted in figs. 1 and 2；
Step 2：Prepare PET base material 23, and the printing pattern layer 24 in PET base material 23；Specific method is：It is thick in 0.2mm
PET base material 23 on printing color ink obtain patterned layer 24, by 98 DEG C of ± 2 DEG C of hot drying tunnel 2.5min preliminary drying dry-cure, so
The colored ink face cladding thickness in patterned layer 24 is 0.06mm blueness LK-820B diaphragms afterwards；
Step 3：Screen layer 25 is made in patterned layer 24；
A, the material that step 2 is obtained is delivered into puncher, punch and obtain diameter 2mm location holes；
B, punched material is sent to laser cutting machine, is aligned using location hole on laser cutting machine, the company of cutting out
The technique via 210 of the positive and negative conductive materials of PET base material is connect, screen process press is delivered to after the completion of cutting；The diameter of technique via 210
It is the circular hole of 0.12mm.
C, the half tone equipped with shielding layer pattern is changed on screen process press, the spacing of half tone and printing machine platform for 4~
5mm；, the pattern of screen layer 25 is line width 1.0mm, line sky compares 1：4.2 rectangular mesh；
D, scraper from shore hardness be 70 degree of perpendicular type frictioning, and on screen process press doctor blade holder with half tone into
75 degree of angles；It is left in half tone from solid content 59%, density 1.84kg/L, viscosity 4600~7400, the silver paste of 100~200g of weight
Side, the returning blade tool on operation screen process press, uniformly silver paste is bulldozed on half tone；
E, half tone take the PET material that step b is obtained after rising, and colored ink is faced up and is placed in silk-screen printing machine table top,
The blue LK-820B diaphragms on PET are held using the wind inlet on table top, and it is with dedusting roller that the dust of material surface is clear
Except clean；
F, operation screen process press put down half tone, move scraper, and conductive silver paste passes through the area of the pattern on half tone, in pattern
The colored ink face of layer 24 leaves screen layer 25；
G, stopping air draught, 98 DEG C of ± 2 DEG C of heat are moved on to from printing table by the PET sheet material with patterned layer 24 and screen layer 25
On the conveyer belt of drying tunnel, it is placed on net car by after 3.5min preliminary drying dry-cure.
Step 4：Antistatic backing 22 is made using silk-screen printing in the another side of PET base material 23；
A, the half tone equipped with antistatic backing pattern is changed on screen process press, the spacing of half tone and printing machine platform for 4~
5mm；
B, from scraper shore hardness be 70 degree of perpendicular type frictioning, be installed on screen process press doctor blade holder and half tone
Into 70 degree of angles；From 15~60dPas of viscosity, the electrically conducting transparent ink of sheet resistance value≤700ohm, in centrifuge with 1500 turns/
Minute stirring is used after 30 minutes, then operates the uniform electrically conductive ink that is bulldozed on half tone of the returning blade on screen process press to starch；
C, half tone take the PET sheet material that step 3 is obtained after rising, and screen layer 25 is placed in silk-screen printing machine table top down, utilize
Wind inlet on table top holds PET, and is removed the dust of material surface with dedusting roller clean；
E, operation screen process press put down half tone, and mobile scraper, electrically conducting transparent ink slurry passes through the area of the pattern on half tone,
The pattern of antistatic backing is left on the surface of PET base material 23；
F, stopping air draught moving on to PET sheet material on 98 DEG C of conveyer belts of ± 2 DEG C of hot drying tunnels from printing table, pre- by 2min
It is placed into after drying and processing on net car；
G, the panel that will be molded send into 130 DEG C ± 3 DEG C of oven heat baking, wait 30min curing process；After heat cure
The surface of PET sheet material is the anti-quiet layer 22 to be formed；
H, test whether PET base material 23 two sides has been turned on resistance measuring instrument, the panel for passing through will be tested and be re-fed into 130
DEG C ± 3 DEG C of oven heat baking, wait 20min curing process；The front of PET base material 23 is that the thickness of full paving is 4um after heat cure
The antistatic backing 22 of transparent conductive material, the back side is that thickness is the screen layer 25 of 6um silver paste grids.
The antistatic backing and screen layer of film key switch are tried one's best and accomplish design all over the screen, can be adopted at the transparent place of thin film switch
Applied with whole face or silk-screen, be coated using electrically conducting transparent ink or silk-screen, thickness is typically at 3~6 microns.In impermeable daylight
Can be printed using silk screen printing process, be printed as latticed, the rectangle net trellis that pattern is, (can be Saint Andrew's cross or positive cross
Intersect)；Line width 0.5-2.5, septal line is empty than controlling 1：1.2—1：4.2, i.e. septal line are empty to be more conducive to high-frequency electrical than smaller
The shielding of magnetic wave, on the contrary i.e. septal line is empty than more big more be conducive to the shielding of low-frequency electromagnetic wave.Applied thickness control is micro- 3~15
Rice
Step 5：The second protective layer 26 is covered on screen layer 25；The first protective layer 21 is covered on antistatic backing 22；
Conductive adhesive layer 27 and button bed course 28 are pasted on second protective layer 26 successively.
Then antistatic backing 22, screen layer 25 and conductive adhesive layer 27 are passed through into multiple technique vias 210 to be connected, then is bonded and leads
Electric glue-line 27, button bed course 28, you can form thin-film key panel, then carry out hot-forming treatment, form button cavity space, by
This lifting feel pressing effect, finally connects with printed circuit board (PCB) 1 and just obtained film key switch again.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail bright, should be understood that and the foregoing is only specific embodiment of the invention, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., should be included in guarantor of the invention
Within the scope of shield.
Claims (9)
1. a kind of film key is switched, by printed circuit board (PCB) (1) and the thin-film key panel being covered on printed circuit board (PCB) (1)
(2) constitute；It is characterized in that：
The printed circuit board (PCB) (1) is followed successively by ground plane (11), bus plane (12) and some signals layers (13) from the bottom to top；It is described
TVS power supply protectors are connected between ground plane (11) and bus plane (12)；The ground plane (11) and some signals layers (13) it
Between connect ESD electrostatic impedors；
The thin-film key panel (2) is from top to bottom followed successively by：First protective layer (21), antistatic backing (22), pet substrate
(23), patterned layer (24), screen layer (25), the second protective layer (26), conductive adhesive layer (27) and button bed course (28)；Described
One protective layer (21), antistatic backing (22), pet substrate (23), patterned layer (24), screen layer (25), the second protective layer (26) and
One transparent window (29) is set on conductive adhesive layer (27)；The antistatic backing (22), pet substrate (23), patterned layer (24), screen
Cover and at least one technique via (210) is set on layer (25), the second protective layer (26) and conductive adhesive layer (27), by antistatic backing
(22), screen layer (25) and conductive adhesive layer (27) are connected；
The ground plane (11) of the printed circuit board (PCB) (1) and the screen layer (25) of thin-film key panel (2) and antistatic backing (22)
Connection.
2. a kind of film key according to claim 1 is switched, it is characterised in that：The antistatic backing (22) is led for transparent
Electric ink；First protective layer (21) and the second protective layer (26) are UV ink；The screen layer (25) is silver paste.
3. a kind of film key according to claim 2 is switched, it is characterised in that：Conductive adhesive layer (27) area is more than
Each layer in portion disposed thereon.
4. a kind of preparation method of thin-film key panel, it is characterised in that comprise the following steps：
Step one：Determine the structure of thin-film key panel (2) as stated in claim 3；
Step 2：Prepare PET base material (23), and the printing pattern layer (24) in PET base material (23)；
Step 3：Screen layer (25) is made in patterned layer (24)；
Step 4：Antistatic backing (22) is made using silk-screen printing in the another side of PET base material (23)；
Step 5：The second protective layer (26) is covered on screen layer (25)；The first protective layer is covered on antistatic backing (22)
(21)；Paste conductive adhesive layer (27) and button bed course (28) successively on the second protective layer (26).
5. the preparation method of a kind of thin-film key panel according to claim 4, it is characterised in that：
The specific method of the step 2 is：Printing color ink obtains patterned layer in the thick PET base materials (23) of 0.2mm
(24), by 98 DEG C of ± 2 DEG C of hot drying tunnel 2.5min preliminary drying dry-cure, then in the colored ink face cladding thickness of patterned layer (24)
It is 0.06mm blueness LK-820B diaphragms；
The specific way of the step 3 is：
A, the material that step 2 is obtained is delivered into puncher, punch and obtain diameter 2mm location holes；
B, punched material is sent to laser cutting machine, is aligned using location hole on laser cutting machine, cut out connection PET
The technique via (210) of the positive and negative conductive materials of base material, delivers to screen process press after the completion of cutting；
C, half tone of the replacing equipped with shielding layer pattern on screen process press, half tone are 4~5mm with the spacing of printing machine platform；
D, scraper from shore hardness be 70 degree of perpendicular type frictioning, and on screen process press doctor blade holder with half tone into 75 degree
Angle；From solid content 59%, density 1.84kg/L, viscosity 4600~7400, the silver paste of 100~200g of weight on the left of half tone,
Returning blade tool on operation screen process press, uniformly silver paste is bulldozed on half tone；
E, half tone take the PET material that step b is obtained after rising, and colored ink is faced up and is placed in silk-screen printing machine table top, utilize
Wind inlet on table top holds the blue LK-820B diaphragms on PET, and is removed the dust of material surface with dedusting roller dry
Only；
F, operation screen process press put down half tone, move scraper, and conductive silver paste passes through the area of the pattern on half tone, in patterned layer
(24) colored ink face leaves screen layer (25).
6. the preparation method of a kind of thin-film key panel according to claim 5, it is characterised in that：In the step 3 also
Including：G, stopping air draught, 98 DEG C ± 2 DEG C are moved on to from printing table by the PET sheet material with patterned layer (24) and screen layer (25)
On the conveyer belt of hot drying tunnel, it is placed on net car by after 3.5min preliminary drying dry-cure.
7. the preparation method of a kind of thin-film key panel according to claim 6, it is characterised in that：In the step 3,
The circular hole of a diameter of 0.12mm of technique via (210), the pattern of screen layer (25) is line width 1.0mm, line sky compares 1：4.2 square
Shape grid.
8. the preparation method of a kind of thin-film key panel according to claim 7, it is characterised in that：
The specific method of the step 4 is：
A, half tone of the replacing equipped with antistatic backing pattern on screen process press, half tone are 4~5mm with the spacing of printing machine platform；
B, from scraper shore hardness be 70 degree of perpendicular type frictioning, be installed on screen process press doctor blade holder and half tone into 70
Degree angle；From 15~60dPas of viscosity, the electrically conducting transparent ink of sheet resistance value≤700ohm, with 1500 revs/min in centrifuge
Stirring is used after 30 minutes, then operates the uniform electrically conductive ink that is bulldozed on half tone of the returning blade on screen process press to starch；
C, half tone take the PET sheet material that step 3 is obtained after rising, and screen layer (25) is placed in silk-screen printing machine table top down, using platform
Wind inlet on face holds PET, and is removed the dust of material surface with dedusting roller clean；
E, operation screen process press put down half tone, and mobile scraper, electrically conducting transparent ink slurry passes through the area of the pattern on half tone,
PET base material (23) surface leaves the pattern of antistatic backing；
F, stopping air draught moving on to PET sheet material on 98 DEG C of conveyer belts of ± 2 DEG C of hot drying tunnels from printing table, by 2min prebakes
It is placed into after treatment on net car；
G, the panel that will be molded send into 130 DEG C ± 3 DEG C of oven heat baking, wait 30min curing process；PET sheet after heat cure
The surface of material is the anti-quiet layer (22) to be formed.
9. the preparation method of a kind of thin-film key panel according to claim 8, it is characterised in that：The step 4 is also wrapped
Include：H, test whether PET base material (23) two sides has been turned on resistance measuring instrument, the panel that passes through will be tested and be re-fed into 130 DEG C
± 3 DEG C of oven heat baking, wait 20min curing process；PET base material (23) front is that the thickness of full paving is 4um after heat cure
The antistatic backing (22) of transparent conductive material, the back side is that thickness is the screen layer (25) of 6um silver paste grids.
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| CN107799347A (en) * | 2017-10-30 | 2018-03-13 | 武汉理工大学 | A kind of in-mould injection thin film switch |
| CN108789925A (en) * | 2018-06-14 | 2018-11-13 | 成都兴旺发塑胶有限公司 | A kind of production method of electrostatic prevention plastic material products |
| CN109481841A (en) * | 2018-10-29 | 2019-03-19 | 晶晨半导体(上海)股份有限公司 | A method of improving Electro-static Driven Comb performance |
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| CN112951635A (en) * | 2021-03-05 | 2021-06-11 | 于都县燕龙电子有限公司 | Energy-saving and environment-friendly membrane switch production process flow |
| CN114023496A (en) * | 2021-11-06 | 2022-02-08 | 厦门鑫铭科技股份有限公司 | Flexible color conductive display film and preparation method thereof |
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Effective date of registration: 20190809 Address after: 528467 Area C, First Floor, Building A, Phase 3 Longtang Hengjie, Tanzhou Town, Zhongshan City, Guangdong Province Patentee after: Zhongshan Chuanguang Electronic Technology Co., Ltd. Address before: 213164 Changzhou Province, the city of Jiangsu City University Road, No. 22 Patentee before: Changzhou College of Information Technology |
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