CN204990248U - Pressure sensor - Google Patents

Abstract

The utility model provides a pressure sensor, which comprises a sensing sheet and a flexible circuit board. The sensing sheet includes an upper protective layer, an electrode layer, a base material, a shielding layer and a lower protective layer arranged in sequence from top to bottom; the flexible circuit board There are two bonding positions on the top, one is connected to the electrode layer, and the other is connected to the shielding layer. The utility model can provide pressure monitoring function for equipment under the premise of adopting simple materials and simple production process. At the same time, the sensing sheet can also be made transparent according to usage requirements.

Description

a pressure sensor

technical field

The invention relates to a pressure sensor, which belongs to the technical field of touch control.

Background technique

At present, touch screens are widely used in mobile phones and other electronic products, but the existing touch screens can only provide the monitoring function of two-dimensional coordinates. With the development of technology and the expansion of functional applications of mobile phones and other electronic products, pressure monitoring has gradually become a market need.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a pressure sensor that can provide pressure monitoring function for equipment under the premise of using simple materials and simple production process. At the same time, transparent pressure sensor solutions can also be provided.

The present invention is achieved in this way. A pressure sensor is characterized in that it includes a sensing sheet and a flexible circuit board. The sensing sheet includes an upper protective layer, an electrode layer, a base material, a shielding layer, and a lower protective layer sequentially arranged from top to bottom There are two bonding positions on the flexible circuit board, one is connected to the electrode layer, and the other is connected to the shielding layer.

Preferably, the upper and lower protective layers are made of insulating ink or protective film.

Preferably, the material of the electrode layer and the shielding layer is indium tin oxide, silver glue, photosensitive silver, nano silver, nano carbon, conductive ink or conductive ink.

Specifically, when the sensing sheet needs to be transparent, the materials of the electrode layer and the shielding layer are preferably indium tin oxide, nano-silver or nano-carbon.

Preferably, the material of the substrate is PET.

Preferably, the induction sheet is bonded to the common ACF of the flexible circuit board.

The beneficial effect of the present invention is to provide pressure monitoring function for equipment under the premise of adopting simple materials and simple production process. At the same time, transparent pressure sensor solutions can also be provided.

Description of drawings

Figure 1 is a schematic diagram of the present invention.

In the figure 1. Induction sheet 11. Upper protective layer 12. Electrode layer 13. Substrate 14. Shielding layer 15. Lower protective layer 2. Flexible printed circuit board.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

As shown in Figure 1, a pressure sensor is characterized in that it includes a sensing sheet 1 and a flexible circuit board 2, and the sensing sheet 1 includes an upper protective layer 11, a layer of electrode layer 12, a layer of Base material 13 , a shielding layer 14 and a lower protective layer 15 ; two bonding positions are provided on the flexible circuit board 2 , one is connected to the electrode layer 12 and the other is connected to the shielding layer 14 .

As a preferred embodiment, the upper protective layer 11 and the lower protective layer 15 are made of insulating ink or a protective film (such as PET film).

As a preferred embodiment, the material of the electrode layer 12 and the shielding layer 14 is indium tin oxide, silver glue, photosensitive silver, nano-silver, nano-carbon, conductive ink or conductive ink. When the sensor sheet needs to be transparent, the electrode layer 12 The material of the shielding layer 14 is preferably indium tin oxide, nano-silver or nano-carbon.

The material of the base material 13 is PET; the induction sheet 1 is bonded with the common ACF of the flexible circuit board. The two positions of the flexible circuit board 2 are in a "Y" shape with the flexible circuit board 2, which is convenient for binding.

In practical applications, the pressure sensor needs to be used with a reference electrode. The reference electrode can be a certain electrode on the application device or an additional reference electrode. The reference electrode is parallel to the sensing sheet 1 . The electrode layer 12 of the sensing sheet 1 faces the reference electrode, and the shielding layer 14 is used to shield the electrode layer from other electromagnetic interference. In the use of the device, it is required that between the reference electrode and the sensing sheet 1, one is fixed, and the other is deformed, so that the capacitance between the reference electrode and the electrode layer 12 changes, and then passes according to a certain algorithm. The capacitance change calculates the pressure. If the pressure sensor is used in a mobile phone, it is preferable to select an electrode of a touch panel or an electrode of a display module as a reference electrode. Taking an electrode of the touch panel as a reference electrode as an example, the sensing sheet 1 is fixed at a certain position on the mobile phone, and the external pressing force of the mobile phone is required not to deform the sensing sheet 1. The sensing sheet 1 and the touch panel parallel. - When the user presses the touch panel of the mobile phone, due to the effect of force, the touch panel will have a small shape, and the distance between the reference electrode on the touch panel and the electrode layer 12 on the sensing sheet 1 will change. As a result, the capacitance of the two changes, and then through a certain algorithm, the pressing action of the finger can be calculated. The electrode layer 12, the shielding layer 14, the base material 13, etc. of the pressure sensor in the present invention are all capacitive screen production materials used, and the production process and production equipment of the capacitive screen can produce the pressure sensor. Compared with the traditional pressure sensor , the production process is greatly simplified, and the pressure sensor of the present invention has a layered structure, which is more suitable for touch screens. At the same time, since the sensor sheet 1 can be made of transparent materials, it can be placed between the mobile phone panel and the display module in practical applications. different needs.

The pressure sensor in the prior art is made of a pure flexible circuit board, which has a large amount of consumables, high cost, great pollution to the environment, and low flatness. However, in the production process of the pressure sensor of the present invention, the cost is low and the impact on the environment is low. Low pollution, high flatness

The above description is a preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Claims (8)

1. a pressure transducer, is characterized in that, comprises sensing chip and flexible circuit board, and sensing chip comprises the up-protective layer, electrode layer, base material, screen layer and the lower protective layer that set gradually from top to bottom; Flexible circuit board is provided with Liang Chu nation location, and a place is connected with electrode layer, and another place is connected with screen layer.

2. a kind of pressure transducer according to claim 1, is characterized in that, the material of described up-protective layer and lower protective layer is dielectric ink or diaphragm.

3. a kind of pressure transducer according to claim 1, is characterized in that, the material of described electrode layer and screen layer is tin indium oxide, elargol, photosensitive silver, Nano Silver, nano-sized carbon, conductive ink or electrically conductive ink.

4. a kind of pressure transducer according to claim 1, is characterized in that, the material of electrode layer and screen layer is tin indium oxide, Nano Silver or nano-sized carbon.

5. a kind of pressure transducer according to claim 1, is characterized in that, the material of described base material is PET.

6. a kind of pressure transducer according to claim 1, is characterized in that, it is fixed that described sensing chip and the general ACF of flexible circuit board carry out nation.

7. a kind of pressure transducer according to claim 1, is characterized in that, the nation location of described flexible circuit board is in " Y " type.

8. a kind of pressure transducer according to claim 2, is characterized in that, described diaphragm is PET film.