CN106876204B - Mining instrument thin film key switch and manufacturing method of shielding layer thereof - Google Patents
Mining instrument thin film key switch and manufacturing method of shielding layer thereof Download PDFInfo
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- CN106876204B CN106876204B CN201710247612.4A CN201710247612A CN106876204B CN 106876204 B CN106876204 B CN 106876204B CN 201710247612 A CN201710247612 A CN 201710247612A CN 106876204 B CN106876204 B CN 106876204B
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- layer
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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
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
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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
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/86—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the casing, e.g. sealed casings or casings reducible in size
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- 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
- H05K1/0224—Patterned shielding planes, ground planes or power planes
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
- H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/07—Electric details
- H05K2201/0707—Shielding
- H05K2201/0715—Shielding provided by an outer layer of PCB
Abstract
The invention discloses a mining instrument thin film key switch and a manufacturing method of a shielding layer thereof, wherein the thin film key switch consists of a printed circuit board and a thin film key panel covered on the printed circuit board; the printed circuit board comprises a ground plane, a power layer and a plurality of signal layers from bottom to top in sequence; a TVS power supply protector is connected between the ground plane and the power supply layer; the thin film key panel sequentially comprises from top to bottom: the key comprises a first protective layer, a PET substrate, a pattern layer, a shielding layer, a second protective layer, a conductive adhesive layer and a key cushion layer; and the ground layer of the printed circuit board is connected with the shielding layer of the thin film key panel. The TVS power supply protection device is connected between the power supply layer and the ground layer in parallel to reduce the electromagnetic interference generated instantly, and the protection key membrane switch is protected.
Description
Technical Field
The invention relates to a mining instrument thin film key switch and a manufacturing method of a shielding layer thereof.
Background
Along with the continuous use of intelligent electronic products in coal mines, the types of electronic products adopting a membrane key switch as an operation panel are increasing. When the traditional membrane key switch is used as an operation panel, because the membrane key switch has two defects, one of the two defects has a large number of gaps, which brings great problems to the shielding of electronic products, and circuits and components of the two switch parts are easily interfered by radio frequency and static electricity, which causes misoperation of key operation. In addition, if the membrane switch is applied to mines, electromagnetic shielding interference resistance measures are difficult.
For mining electrical products, the explosion-proof safety of the mining electrical products is very important. The safety type of the current mining explosion-proof electrical product mainly takes explosion-proof type and intrinsic safety type as main materials. The intrinsic safety design is to strictly control the electric spark energy generated by each part of the circuit, so the electromagnetic shielding interference problem is fully considered in the design.
Disclosure of Invention
The invention provides a mining instrument membrane key switch.
The technical scheme for realizing the first object of the invention is that the mine instrument thin film key switch consists of a printed circuit board and a thin film key panel covered on the printed circuit board; the printed circuit board comprises a ground plane, a power layer and a plurality of signal layers from bottom to top in sequence; a TVS power supply protector is connected between the ground plane and the power supply layer;
the film key panel sequentially comprises from top to bottom: the key comprises a first protective layer, a PET (polyethylene terephthalate) base material, a pattern layer, a shielding layer, a second protective layer, a conductive adhesive layer and a key cushion layer; at least one process through hole is formed in the PET base material, the pattern layer, the shielding layer, the second protective layer and the conductive adhesive layer, and the shielding layer is connected with the conductive adhesive layer;
and the ground layer of the printed circuit board is connected with the shielding layer of the thin film key panel.
The first protective layer and the second protective layer are UV printing ink; the shielding layer is made of conductive paste.
The area of the conductive adhesive layer is larger than that of each layer on the upper part of the conductive adhesive layer.
The second objective of the present invention is to provide a method for manufacturing a shielding layer of a thin film keypad.
The technical scheme for realizing the second purpose of the invention is a method for manufacturing a shielding layer of a film key panel, which comprises the following steps:
the method comprises the following steps: preparing a PET (polyethylene terephthalate) base material, and printing a pattern layer on the PET base material;
step three: manufacturing a shielding layer on the pattern layer;
a. cutting a process through hole for connecting positive and negative conductive substances of the PET substrate on a laser cutting machine, and sending the PET substrate to a screen printing machine after cutting;
b. replacing a screen printing plate provided with a shielding layer pattern on a screen printing machine, wherein the distance between the screen printing plate and a printing machine table is 4-5 mm;
c. the scraper selects right-angle type frictioning with Shore hardness of 70 degrees, and is arranged on a scraper frame of a screen printing machine to form an angle of 75 degrees with the screen printing plate; using conductive paste on the left side of the screen printing plate, operating a ink returning cutter on the screen printing machine, and uniformly pushing and leveling the silver paste on the screen printing plate once;
d. b, taking the PET material obtained in the step b after the screen printing plate is lifted, placing the color printing ink face upwards on the table top of the screen printing machine, sucking the PET material by using air suction holes in the table top, and cleaning dust on the surface of the material by using a dust removal roller;
e. operating a screen printer to put down a screen printing plate, moving a scraper, and enabling conductive silver paste to pass through a pattern area on the screen printing plate to leave a shielding layer on the color ink surface of the pattern layer;
f. stopping air suction, moving the PET plate with the pattern layer and the shielding layer from the printing table top to a conveyor belt of a 98 +/-2 ℃ hot drying channel, carrying out pre-drying treatment for 3.5min, placing the PET plate on a net car, and then sending the PET plate into a hot oven for carrying out hot curing treatment at the temperature of 130 +/-3 ℃ for 30 min.
The specific method of the first step comprises the following steps: printing color ink on a PET substrate with the thickness of 0.35mm to obtain a pattern layer, carrying out pre-drying treatment on the pattern layer for 2.5min by a hot drying channel with the temperature of 100 +/-2 ℃, and placing the pattern layer on a net car for later use.
The diameter of the process through hole is a circular hole of 0.12mm, the pattern of the shielding layer is a circular hole with the line width of 1.0mm and the line space ratio of 1: 3.2 rectangular grid.
In the second step, when the silver paste is used for shielding signals larger than 50MHZ, silver paste with the solid content of 59%, the density of 1.84kg/L, the viscosity of 4600-7400 and the weight of 100-200 g is adopted; when the conductive paste is used for shielding signals larger than 1000KHZ, silver-copper conductive paste with the solid content of 45%, the density of 1.3kg/L, the viscosity of 4600-7400 and the weight of 100-150 g is adopted; when the conductive paste is used for magnetic shielding, the conductive paste is nickel conductive paste with the solid content of 48%, the density of 1.4kg/L, the viscosity of 4600-7400 and the weight of 100-180 g.
After the technical scheme is adopted, the invention brings the following beneficial effects: (1) the TVS power supply protection device is connected between the power supply layer and the ground layer in parallel to reduce the electromagnetic interference generated instantly, and the protection key membrane switch is protected.
(2) According to the invention, the shielding layer and the conductive adhesive layer are connected through the plurality of process through holes arranged on the periphery of the key frame and then connected with the metal shell through the conductive adhesive layer, so that a tight shielding cavity is formed with the integral shell of the equipment, components in the cavity are integrally protected, and stable production of the components under the condition of no radio frequency and static interference can be ensured.
(3) The invention arranges a key cushion layer between the printed circuit board and the film key panel to isolate the conductive adhesive layer from the copper foil signal layer on the circuit board.
(4) The process can ensure the electromagnetic shielding effect, has high conductivity and high electromagnetic shielding efficiency, and achieves the shielding efficiency on different electromagnetic wave frequencies by controlling the type, thickness, linearity and shape of the silk-screen material.
(5) The process of the invention effectively reduces the manufacturing cost of the membrane key switch and is suitable for mass production. The EMI shielding device can be widely applied to EMI shielding of the operation key panel of the measuring equipment for the coal mine.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
Fig. 1 is a front view of a membrane key switch of the present invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a circuit diagram of the present invention.
The reference numbers in the drawings are as follows:
the circuit board comprises a printed circuit board 1, a ground plane 11, a power supply layer 12, a signal layer 13, a thin film key panel 2, a first protective layer 21, a PET substrate 22, a pattern layer 23, a shielding layer 24, a second protective layer 25, a conductive adhesive layer 26, a key pad layer 27 and a process via hole 28.
Detailed Description
(example 1)
Referring to fig. 1 and fig. 2, the mining instrument membrane key switch of the present embodiment is composed of a printed circuit board 1 and a membrane key panel 2 covering the printed circuit board 1; the printed circuit board 1 comprises a ground plane 11, a power plane 12 and a plurality of signal layers 13 from bottom to top in sequence; the thin film key panel 2 is sequentially from top to bottom: the key pad comprises a first protective layer 21, a PET substrate 22, a pattern layer 23, a shielding layer 24, a second protective layer 25, a conductive adhesive layer 26 and a key pad layer 27; at least one process through hole 28 is formed in the PET substrate 22, the pattern layer 23, the shielding layer 24, the second protective layer 25 and the conductive adhesive layer 26 to connect the shielding layer 24 and the conductive adhesive layer 26; the ground plane 11 of the printed circuit board 1 is connected to the shielding layer 24 of the thin film keypad 2. The first protective layer 21 and the second protective layer 25 are UV ink; the shielding layer 24 is a conductive paste. The layer of conductive adhesive 26 is larger in area than the layers on top of it for contact with the chassis.
The manufacturing method of the thin film key shielding layer of the mining instrument comprises the following steps:
the method comprises the following steps: preparing a PET substrate 22, and printing a pattern layer 23 on the PET substrate 22; printing color ink on a PET substrate 22 with the thickness of 0.35mm to obtain a pattern layer 23, pre-drying the pattern layer by a 100 +/-2 ℃ hot drying channel for 2.5min, and placing the pattern layer on a net car for later use
Step three: manufacturing a shielding layer 24 on the pattern layer 23;
a. cutting a process through hole 28 for connecting the positive and negative conductive substances of the PET substrate on a laser cutting machine, and sending the PET substrate to a screen printing machine after cutting;
b. replacing a screen printing plate provided with a shielding layer pattern on a screen printing machine, wherein the distance between the screen printing plate and a printing machine table is 4-5 mm;
c. the scraper selects right-angle type frictioning with Shore hardness of 70 degrees, and is arranged on a scraper frame of a screen printing machine to form an angle of 75 degrees with the screen printing plate; using conductive paste on the left side of the screen printing plate, operating a ink returning cutter on the screen printing machine, and uniformly pushing and leveling the silver paste on the screen printing plate once; when the silver paste is used for shielding signals larger than 50MHZ, silver paste with the solid content of 59%, the density of 1.84kg/L, the viscosity of 4600-7400 and the weight of 100-200 g is adopted; when the conductive paste is used for shielding signals larger than 1000KHZ, silver-copper conductive paste with the solid content of 45%, the density of 1.3kg/L, the viscosity of 4600-7400 and the weight of 100-150 g is adopted; when the conductive paste is used for magnetic shielding, the conductive paste is nickel conductive paste with the solid content of 48%, the density of 1.4kg/L, the viscosity of 4600-7400 and the weight of 100-180 g.
d. B, taking the PET material obtained in the step b after the screen printing plate is lifted, placing the color printing ink face upwards on the table top of the screen printing machine, sucking the PET material by using air suction holes in the table top, and cleaning dust on the surface of the material by using a dust removal roller;
e. operating the screen printer to put down the screen printing plate, moving the scraper, and allowing the conductive silver paste to pass through the pattern area on the screen printing plate to leave the shielding layer 24 on the color ink surface of the pattern layer 23;
f. stopping air suction, moving the PET plate with the pattern layer 23 and the shielding layer 24 from the printing table top to a conveyor belt of a 98 +/-2 ℃ hot drying channel, carrying out pre-drying treatment for 3.5min, placing the PET plate on a net car, and then sending the PET plate into a hot oven for carrying out hot curing treatment at the temperature of 130 +/-3 ℃ for 30 min.
The diameter of the process through hole 28 is a circular hole of 0.12mm, and the pattern of the shielding layer 24 is a circular hole with a line width of 1.0mm and a line space ratio of 1: 3.2 rectangular grid. The smaller the space ratio of the spacing lines is, the more favorable the shielding of high-frequency electromagnetic waves is, and conversely, the larger the space ratio of the spacing lines is, the more favorable the shielding of low-frequency electromagnetic waves is.
Referring to fig. 3, a TVS power supply protector is connected between the ground plane 11 and the power plane 12; the ground plane 11 of the printed circuit board 1 is connected to the shielding layer 24 of the thin film keypad 2. Ground plane 11, power plane 12 and a plurality of signal layer 13 of printed circuit board 1 are all electrically conductive, face a lot of interference, have 50 HZ's power frequency interference on power plane 12, can concatenate the different interference signal of all kinds of frequency composition on the signal layer 13, to the power plane, adopt to connect TVS power protection device in parallel between power plane and ground plane, because transient state high voltage and current interference are the leading cause that causes the circuit to damage. The adoption of TVS in the membrane key switch is a good means for resisting electromagnetic interference. When the two ends of the TVS power protector are impacted by instantaneous high energy, the TVS power protector can cause the impedance to be suddenly reduced at a very high speed (up to 1/(10^12) seconds), and simultaneously absorb interference current and clamp the voltage of the two ends of the TVS power protector at a preset value, thereby ensuring that the following circuit elements are prevented from being damaged by interference impact. During wiring, the ground wire is distributed to the greatest extent or the reserved space of the printed circuit board is filled with the ground wire, so that the interference generated by the resistance of the lead wire is reduced or the reserved space is treated as a shielding layer.
Then the shielding layer 24 and the conductive adhesive layer 26 are connected through a plurality of process through holes 28, the conductive adhesive layer 26 and the key cushion layer 27 are bonded, a thin film key panel can be formed, hot press forming treatment is carried out, a key cavity space is formed, therefore, the hand feeling pressing effect is improved, and finally the thin film key switch for the mining instrument is connected with the printed circuit board 1 to obtain the thin film key switch for the mining instrument.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A manufacturing method of a thin film key shielding layer of a mining instrument is characterized by comprising the following steps:
the mining instrument thin film key switch consists of a printed circuit board (1) and a thin film key panel (2) covered on the printed circuit board (1);
the printed circuit board (1) is sequentially provided with a ground plane (11), a power supply layer (12) and a plurality of signal layers (13) from bottom to top; a TVS power supply protector is connected between the ground plane (11) and the power supply layer (12);
film keypad (2) is from top to bottom in proper order: the key pad comprises a first protective layer (21), a PET base material (22), a pattern layer (23), a shielding layer (24), a second protective layer (25), a conductive adhesive layer (26) and a key pad layer (27); at least one process through hole (28) is formed in the PET substrate (22), the pattern layer (23), the shielding layer (24), the second protective layer (25) and the conductive adhesive layer (26) to connect the shielding layer (24) and the conductive adhesive layer (26);
the ground layer (11) of the printed circuit board (1) is connected with the shielding layer (24) of the thin film key panel (2);
the method comprises the following steps:
the method comprises the following steps: preparing a PET base material (22), and printing a pattern layer (23) on the PET base material (22);
step two: manufacturing a shielding layer (24) on the pattern layer (23);
a. cutting a process through hole (28) for connecting the positive and negative conductive substances of the PET substrate on a laser cutting machine, and sending the PET substrate to a screen printing machine after the cutting is finished;
b. replacing a screen printing plate provided with a shielding layer pattern on a screen printing machine, wherein the distance between the screen printing plate and a printing machine table is 4-5 mm;
c. the scraper selects right-angle type frictioning with Shore hardness of 70 degrees, and is arranged on a scraper frame of a screen printing machine to form an angle of 75 degrees with the screen printing plate; using conductive paste on the left side of the screen printing plate, operating a ink returning cutter on the screen printing machine, and uniformly pushing and leveling the silver paste on the screen printing plate once;
d. b, lifting the screen printing plate, taking the PET substrate obtained in the step b, placing the color printing ink face upwards on the table top of the screen printing machine, sucking the PET substrate by using air suction holes in the table top, and cleaning dust on the surface of the material by using a dust removal roller;
e. the screen printer is operated to lay down the screen, the doctor blade is moved and the conductive silver paste passes through the pattern areas on the screen, leaving a screen layer (24) on the colour ink side of the pattern layer (23).
2. The manufacturing method of the mining instrument thin film key shielding layer according to claim 1, characterized by comprising the following steps:
the specific method of the first step comprises the following steps: printing color ink on a PET substrate (22) with the thickness of 0.35mm to obtain a pattern layer (23), carrying out pre-drying treatment on the pattern layer by a 100 +/-2 ℃ hot drying channel for 2.5min, and placing the pattern layer on a net car for later use.
3. The manufacturing method of the mining instrument thin film key shielding layer according to claim 2, characterized by comprising the following steps: the second step further comprises: f. stopping air suction, moving the PET substrate with the pattern layer (23) and the shielding layer (24) from the printing table top to a conveyor belt of a 98 +/-2 ℃ hot drying channel, carrying out pre-drying treatment for 3.5min, placing the PET substrate on a net car, and then sending the PET substrate into a hot drying oven for carrying out hot curing treatment at the temperature of 130 +/-3 ℃ for 30 min.
4. The manufacturing method of the mining instrument thin film key shielding layer according to claim 3, characterized by comprising the following steps: in the second step, the diameter of the process through hole (28) is a circular hole of 0.12mm, the pattern of the shielding layer (24) is a line width of 1.0mm, and the line space ratio is 1: 3.2 rectangular grid.
5. The manufacturing method of the mining instrument thin film key shielding layer according to claim 4, characterized by comprising the following steps: in the second step, when the silver paste is used for shielding signals larger than 50MHZ, silver paste with the solid content of 59%, the density of 1.84kg/L, the viscosity of 4600-7400 and the weight of 100-200 g is adopted; when the conductive paste is used for shielding signals larger than 1000KHZ, silver-copper conductive paste with the solid content of 45%, the density of 1.3kg/L, the viscosity of 4600-7400 and the weight of 100-150 g is adopted; when the conductive paste is used for magnetic shielding, the conductive paste is nickel conductive paste with the solid content of 48%, the density of 1.4kg/L, the viscosity of 4600-7400 and the weight of 100-180 g.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247612.4A CN106876204B (en) | 2017-04-14 | 2017-04-14 | Mining instrument thin film key switch and manufacturing method of shielding layer thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247612.4A CN106876204B (en) | 2017-04-14 | 2017-04-14 | Mining instrument thin film key switch and manufacturing method of shielding layer thereof |
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| Publication Number | Publication Date |
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| CN106876204A CN106876204A (en) | 2017-06-20 |
| CN106876204B true CN106876204B (en) | 2020-03-06 |
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| CN106876204B (en) * | 2017-04-14 | 2020-03-06 | 常州信息职业技术学院 | Mining instrument thin film key switch and manufacturing method of shielding layer thereof |
| CN111935967B (en) * | 2020-08-18 | 2024-02-20 | 无锡华测电子***有限公司 | Method for installing electromagnetic shielding structure of multichannel tile type transceiver component |
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| CN106876204A (en) * | 2017-04-14 | 2017-06-20 | 常州信息职业技术学院 | A kind of preparation method of mining instrument thin-film key switch and its screen layer |
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| CN1965562A (en) * | 2004-06-04 | 2007-05-16 | 韩郁情报技术有限公司 | El sheet and dome keypad using the same |
| CN101189930A (en) * | 2005-06-20 | 2008-05-28 | 东丽株式会社 | Method for producing electromagnetic wave shielding sheet, electromagnetic wave shielding sheet produced by such method, and filter and display employing same |
| CN1870881A (en) * | 2006-05-25 | 2006-11-29 | 七二国际股份有限公司 | Electromagnetic shielded film and its manufacturing method |
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Effective date of registration: 20200612 Address after: No.120 Xihu Road, Wujin national high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee after: CHANGZHOU PULIMAI ELECTRONIC DEVICES Co.,Ltd. Address before: 213164 Changzhou Province, the city of Jiangsu City University Road, No. 22 Patentee before: CHANGZHOU College OF INFORMATION TECHNOLOGY |