CN216851936U - Capacitance switch - Google Patents

Abstract

A circuit printing layer is provided with a silver paste layer and a conductive oil layer which are used for realizing circuit conduction, and the front surface of a printing plate. The printing plate is provided with a plurality of conductive oil layers. The edge of each conductive oil layer is provided with a silver paste layer. The edge silver paste layer of each conductive oil layer is connected to the lead outlet through the silver paste layer as wiring. The electrostatic shielding layer is on the back of the printing plate. And the ground wire at the outlet of the lead wire is connected with the electrostatic shielding layer at the back through the tank hole silver paste layers in at least two tank holes on the printing plate to realize electric conduction. The front surface is provided with a circuit insulating layer, and the outlet of the lead is provided with a carbon paste layer. The electrostatic shielding layer is provided with parallelogram grid grooves. The shielding layer circuit is in four-way and eight-way, can quickly transfer static electricity, and is independently designed, so that a large amount of space is saved, and the product area is not increased. The printing defects are reduced, the production difficulty is reduced, the key interference is reduced, the static electricity of a human body is eliminated, and the production efficiency of the product is improved.

Description

Capacitance switch

Technical Field

The utility model belongs to the technical field of the capacitance switch makes, especially, relate to a capacitance switch can use jar hole technology to make, is used in the automobile apron.

Background

With the improvement of living standard and the development of production technology, the traditional membrane switch is gradually eliminated, and more household appliances and automobile dial plate products are turned to the development of a capacitive touch switch. The capacitive touch switch is relatively simple in structure and small in occupied area. Meanwhile, since the area of the capacitor product is small, when the multi-key function is realized, the problem of insufficient space position when the wiring is arranged appears, as shown in fig. 1 below. Wherein 1 is a silver paste layer, 2 is a conductive oil layer, 3 is a UV insulating layer, 4 is a carbon paste layer, 5 is a shielding layer. As can be seen in fig. 1, the underlying wiring is very tight and can interfere with each other.

The traditional circuit of the membrane switch arrangement can solve the problem of insufficient wiring position through a printed jumper wire mode, but a capacitance switch cannot. Conduction principle of the capacitive switch: when a human finger approaches the touch key, the total induction capacitance value is increased by the induction capacitance formed by the human finger and the ground and the induction capacitance formed by the sensor in parallel connection with the ground. After the capacitance touch key IC detects that the value of the induction capacitance of a certain key changes, a determination signal that the certain key is pressed is output, and therefore conduction is achieved. Meanwhile, due to the fact that the wiring position is not enough, wiring distance is short, and the problem of key string can occur to the keys. When the function of the key A is pressed, the key B is conducted. In addition, the product area is small, so that the position of a shielding wire is small, and the surface static electricity of the product is large and reaches over 10 KV.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of insufficient positions of the circuits arranged on the circuit panel, the panel product is narrow, but the product to be realized has more functions, more keys and more wires on the product, so that the circuit wires are dense, the keys are in series connection, the surface static electricity of the product is large, and the customer's use is seriously influenced

The problem of the effect. The utility model provides a simple structure, convenient operation's a capacitance switch.

The technical scheme is as follows:

a capacitive switch includes a printed board, a wiring printed layer, and an electrostatic shielding layer.

The technical key points are as follows:

the circuit printing layer is provided with a silver paste layer and a conductive oil layer for realizing circuit conduction and is arranged on the front surface of the printing plate.

The printing plate is provided with a plurality of conductive oil layers.

The edge of each conductive oil layer is provided with a silver paste layer.

The edge silver paste layer of each conductive oil layer is connected to the lead outlet through the silver paste layer as wiring.

The electrostatic shielding layer is disposed on the back surface of the printed board.

And the ground wire in the wiring at the outlet of the lead wire is connected with the electrostatic shielding layer on the back through the tank hole silver paste layers in at least two tank holes on the printing plate to realize the electric conduction.

Furthermore, the periphery of the silver paste layer is used for protecting a line insulating layer of the silver paste layer.

Further, the circuit insulating layer covers the silver paste layer.

Further, a carbon slurry layer is arranged at the outlet of the lead.

Furthermore, the electrostatic shielding layer is provided with parallelogram grid grooves.

The advantages are that:

this scheme adopts parallelogram structure's shielding net, and the circuit leads to eight reaches, can shift static fast, effectively solves the big problem of car apron circuit electric capacity product static. Meanwhile, the electrostatic shielding layer is designed independently, so that a large amount of space is saved, the trend of the circuit is smoother, and the series connection phenomenon of the capacitors of the keys is effectively avoided. The wiring is neater and more beautiful in the circuit design, the route is shorter, and the whole is more sensitive. The method solves the problems by printing circuits on the front side and the back side of the material without increasing the product area.

Be equipped with circuit layer region and electrostatic shielding layer region on jar hole capacitive switch product, the circuit printing region mainly realizes product button service function. The circuit layer printing area is mainly printed with a silver paste layer for realizing circuit conduction and conductive oil at the key for connecting the key conduction. And a carbon paste conducting layer which is used for increasing pulling and inserting resistance, abrasion resistance and service life is printed on a silver paste circuit for connecting a panel plastic shell at the lead outlet. And the UV circuit insulating layer which is used for protecting the silver paste, preventing the ink of the silver paste circuit from being oxidized and playing a role of protection can be printed on the silver paste circuit in a full-page manner. The other side of the product is printed with a shielding layer for preventing signal interference and eliminating static electricity, and the shielding layer is printed with full-page conductive silver. The pot hole silver which plays a role in conduction is arranged between the electrostatic shielding layer and the circuit layer, the printing mode reduces the bad printing, reduces the production difficulty, reduces the key interference, eliminates the static electricity of a human body, and improves the production efficiency of products.

Drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a front projection view of the wiring layer of the switch.

Fig. 3 is a front projection view of the shielding layer circuit of the switch.

FIG. 4 is an effect diagram of each printing layer.

1-conductive silver paste layer, 2-conductive oil layer, 3-circuit insulating layer, 4-carbon paste layer, 5-electrostatic shielding layer, 6-tank hole silver paste, lead outlet 7, tank hole 8 and grid groove 9.

Detailed Description

A capacitive switch includes a printed board, a wiring printed layer, and an electrostatic shielding layer 5.

The front surface of the printing plate is a circuit printing layer, and the back surface of the printing plate is an electrostatic shielding layer 5.

The circuit printing layer mainly realizes the product application function.

The circuit printing layer is provided with a silver paste layer 1 for realizing circuit conduction, a conductive oil layer 2 and a circuit insulating layer 3, and is arranged on the front surface of the printing plate.

The printed board is provided with a plurality of conductive oil layers 2 (as buttons).

The edge of each conductive oil layer 2 is provided with a silver paste layer 1.

The edge silver paste layer 1 of each conductive oil layer 2 is connected to the position of a lead outlet 7 through the corresponding silver paste layer 1 serving as wiring.

The electrostatic shielding layer 5 is printed on the back surface to prevent signal interference and eliminate static electricity.

The electrostatic shielding layer 5 is a silver paste layer.

The ground in the wiring at the lead outlet 7 is electrically conductive through the can hole silver paste layer in at least two can holes 8 on the printed board to connect the back shield layer 5.

In this embodiment, there are nine conductive oil layers 2 (buttons) and two pot holes 8.

Furthermore, a circuit insulating layer 3 (UV oil, polyurethane ultraviolet curing coating) for protecting the silver paste layer 1 is arranged around the silver paste layer 1, and is used for protecting the silver paste layer 1 and preventing the silver paste layer 1 from being oxidized.

Furthermore, a carbon slurry layer 4 is arranged at the lead outlet 7 and used for protecting the silver slurry layer 1 and prolonging the service life of friction.

Further, the line insulating layer 3 may cover the silver paste layer 1.

The printing plate is a tank hole line printing base, and can be a PET plate.

Further, a parallelogram grid groove 9 is arranged on the electrostatic shielding layer 5.

The printing process is to print the front side and the back side of the material.

After the capacitor switch product printing PET (poly terephthalic acid) substrate punching hole (tank hole 8) is processed, silver paste needs to be filled in the tank hole 8, the conductive effect between two surfaces is achieved, the silver paste requirement of the tank hole is uniform all around, and the silver paste is connected with positive and negative two-surface lines to be smooth, bubble-free and pinhole-free.

The silver paste layer 1 is mainly used for wiring the line current and has the function of connecting the key switch. And a conductive ink layer 2 with a conductive function is printed at each key position in the circuit. In the circuit layer, the whole printing can be carried out on the silver paste layer 1 to form an insulating layer 3 for protecting the silver paste, preventing the silver paste from being oxidized and increasing the winding and folding resistance. At the 7 exit positions of capacitive switch lead wire for on the circuit layer silver thick liquid circuit of connecting the panel and moulding the shell, it inserts to still print to increase resistant pulling out, and wear resistant increases life's electrically conductive carbon thick liquid 4. On the other side of the circuit layer material, an electrostatic shielding layer 5 for eliminating static electricity is printed, and the electrostatic shielding layer 5 is a printed whole-plate conductive silver paste. Between the electrostatic shielding layer 5 and the circuit layer, the silver paste in the tank hole 8 plays a role of conducting silver paste circuits on the front side and the back side.

Compared with a circuit before improvement in a combined mode, the circuit is shown in figure 1, the whole wiring direction interval is large, clean and tidy, bad printing is reduced, production difficulty is reduced, key interference is reduced, static electricity of a product is eliminated, and production efficiency of the product is improved.

In the manufacturing process, the present invention is explained with reference to fig. 2 and 3, as shown in fig. 2, dust, impurities, bubbles, etc. are not allowed on the printing surface of the whole circuit layer, otherwise, the stability and sensitivity of the electric conduction can be affected. Simultaneously, the tank hole 8 is the key point, and the uneven silver paste of the tank hole can cause the failure of the function of the whole circuit.

After the capacitive switch product is printed, punching processing is needed, and LED lamps can be arranged in openings above the four switches on the right side of the figure 2.

Claims (9)

1. A capacitive switch comprises a printed board, a wiring printed layer and an electrostatic shielding layer (5); the method is characterized in that:

the circuit printing layer is provided with a silver paste layer (1) and a conductive oil layer (2) for realizing circuit conduction and is arranged on the front surface of the printing plate;

a plurality of conductive oil layers (2) are arranged on the printing plate;

the edge of each conductive oil layer (2) is provided with a silver paste layer (1),

the edge silver paste layer (1) of each conductive oil layer (2) is connected to a lead outlet (7) through the silver paste layer (1) serving as a wiring;

an electrostatic shielding layer (5) is arranged on the back of the printing plate;

the ground wire in the wiring at the lead outlet (7) is connected with the electrostatic shielding layer (5) on the back through the tank hole silver paste layers in at least two tank holes (8) on the printed board to realize the electric conduction.

2. A capacitive switch according to claim 1, wherein:

the electrostatic shielding layer (5) is a silver paste layer.

3. A capacitive switch according to claim 1, wherein:

the periphery of the silver paste layer (1) is used for protecting the circuit insulating layer (3) of the silver paste layer (1).

4. A capacitive switch according to claim 3, wherein:

the circuit insulating layer (3) is a UV oil layer.

5. A capacitive switch according to claim 3, wherein:

the circuit insulating layer (3) covers the silver paste layer (1).

6. A capacitive switch according to claim 1, wherein:

a carbon slurry layer (4) is arranged at the lead outlet (7).

7. A capacitive switch according to claim 1, wherein:

the printing plate is a PET plate.

8. A capacitive switch according to claim 1, wherein:

nine conductive oil layers (2) are provided, and two tank holes (8) are provided.

9. A capacitive switch according to claim 1, wherein:

the electrostatic shielding layer (5) is provided with parallelogram grid grooves (9).

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