CN217687608U - Film type pressure sensing piece - Google Patents

Abstract

The utility model discloses a film type pressure sensing piece, including sensing material layer, electrode layer and articulamentum, the electrode layer has at least one electrode unit, the articulamentum sets up between sensing material layer and electrode layer so that keep certain clearance under initial condition between sensing material layer and the electrode layer, the electrode unit constitutes a sensing unit rather than the sensing material that just corresponds; the elastic insulating material is adopted to manufacture the bulges; the bulges are arranged between the sensing material layer and the electrode layer and are arranged in a staggered mode with the electrode units, and the thickness of the bulges is smaller than that of the connecting layer. The utility model discloses can realize adjusting the measuring range of film formula pressure sensor piece under the condition that does not change film formula pressure sensor material.

Description

Film type pressure sensing piece

Technical Field

The utility model relates to a pressure sensor technical field especially relates to a film formula pressure sensing piece.

Background

With the development of industrial technology, the thin film pressure sensor is widely applied to pressure detection of industrial equipment, such as wearable electronic equipment, robots, industrial detection, scientific research, and the like, due to its advantages of being light and thin and having good flexibility and ductility. In some industrial measurements, the pressure to be measured is large, and a large range of thin film pressure sensors is often needed. In order to enable the thin film type pressure sensor to measure a larger pressure, it is usually realized by changing the thin film material of the thin film type pressure sensor, which is not favorable for manufacturing.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a film type pressure sensing piece through set up a plurality of insulating archs on film type pressure sensing piece to the realization is adjusting film type pressure sensing piece's measuring range under the condition that does not change film type pressure sensor material.

The technical scheme of the utility model as follows:

a thin film type pressure sensing sheet comprises a sensing material layer, an electrode layer and a connecting layer, wherein the electrode layer is provided with at least one electrode unit, the connecting layer is arranged between the sensing material layer and the electrode layer so as to keep a certain gap between the sensing material layer and the electrode layer in an initial state, and the electrode unit and a sensing material which is right corresponding to the electrode unit form a sensing unit; the elastic insulating material is adopted to manufacture the bulges; the bumps are arranged between the sensing material layer and the electrode layer and are arranged in a staggered manner with respect to the sensing units.

As a preferable scheme, the electrode layer comprises a plurality of electrode units, and the electrode units are provided with signal transmission lines; when a cross point exists between any two signal transmission lines, at least one bulge is arranged at the cross point and clamped between the two signal transmission lines.

Preferably, the cross-sectional outer contour of the protrusion is larger than the outer contour of the intersection point.

As a preferable scheme, the protrusions are arranged in an annular array or a rectangular array; or the arrangement mode of the bulges is the same as that of the electrode units.

Preferably, the elastic insulating material is at least one of polyurethane and epoxy resin.

Preferably, the thickness of the protrusion is smaller than the thickness of the connection layer.

Preferably, the thickness of the protrusions is between 1 μm and 1 mm.

Preferably, the thickness of the protrusions is between 50 μm and 500. Mu.m.

Preferably, the cross section of the protrusion is rectangular, circular, semicircular, elliptical, triangular or regular polygonal.

Preferably, the cross section of the protrusion is square.

Preferably, the protrusions are formed on the sensing material layer or the electrode layer by injection molding, spraying or printing, or are disposed on the sensing material layer or the electrode layer by adhesion.

Has the advantages that:

(1) The utility model discloses a plurality of elastic insulation that set up on film formula pressure sensing piece are protruding, change film formula pressure sensing piece and sense material layer and electrode unit's area of contact change when the pressurized, and then change the specific pressure measurement scope of film formula pressure sensing piece, increase film formula pressure sensing piece's measuring range.

(2) The utility model discloses the accessible is established protruding clamp between the crosspoint of the signal transmission line of electrode unit, not only can play the effect that increases measuring range, can also play the isolated effect of positive negative electrode. (3) The utility model discloses compare in the mode that modes such as change film materials adjusted the measuring range, only need make a small amount of adjustments to the structural of film formula pressure sensing piece, increase protruding structure promptly, and simple, with low costs, the facilitate promotion of preparation technology.

Drawings

FIG. 1 is a schematic structural diagram of a thin film pressure sensing chip 1 according to an embodiment;

FIG. 2 is a schematic structural diagram of a thin film pressure sensing chip according to an embodiment 2;

in fig. 3: (a) is a schematic diagram of an electrode layer structure; (b) is a partial enlarged schematic diagram of a bulge in the electrode layer; and (c) is a cross-sectional view of the projection in the electrode layer.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

Referring to fig. 1, an embodiment of the present invention provides a thin film pressure sensing sheet, the thin film pressure sensing sheet mainly includes a sensing material layer 1, an electrode layer 2 and a connection layer 4, the connection layer 4 is disposed between the sensing material layer 1 and the electrode layer 2 to keep a certain gap between the sensing material layer 1 and the electrode layer 2 in an initial state, a plurality of array electrode units 21 are disposed on the electrode layer 2, the sensing material layer 1 and the electrode layer 2 are overlapped with each other to form a pressure sensing unit, that is, each electrode unit 21 and its opposite sensing material form a sensing unit. After the film-type pressure sensing sheet is deformed under pressure, the sensing material layer 1 contacts the electrode unit 21 and generates interface capacitance or impedance which changes along with the change of the contact area, and further generates an electrical signal responding to the change of the interface capacitance or impedance.

It can be understood that the film-type pressure sensing sheet reflects the pressure condition by the contact between the sensing material layer 1 and the electrode unit 21 in the electrode layer 2 and the generation of interface capacitance or impedance which varies with the change of the contact area, and the larger the pressure applied to the same film-type pressure sensing sheet, the larger the contact area between the sensing material layer 1 and the electrode unit 21. However, within a certain stress interval, the variation range of the contact area between the sensing material layer 1 and the electrode unit 21 is limited, that is, the pressure range that can be measured by a film-type pressure sensing chip prepared by the same preparation process and material is specific.

In order to adjust the pressure detection range of the above-mentioned film type pressure sensing piece, refer to fig. 2, the utility model discloses well film type pressure sensing piece further is provided with a plurality of elastic protrusions 3, and a plurality of protrusions 3 set up on sensing material layer 1 or electrode layer 2 arbitrary one and place in between sensing material layer 1 and electrode layer 2 and with the dislocation set of sensing unit, guarantee from this that can also increase the measuring range under the condition that does not influence the sensing unit response.

It will be appreciated that the projections 3 are of a resilient material and will deform resiliently when compressed. When an object with pressure to be measured is pressed on the film type pressure sensing piece, the sensing material layer 1 and the electrode layer 2 are stressed to be close to each other, and the bulge 3 is arranged in the gap between the sensing material layer 1 and the electrode layer 2 and can resist a part of pressure acting between the sensing material layer 1 and the electrode layer 2, so that the change of the contact area of the sensing material layer 1 and the electrode unit on the film type pressure sensing piece is smaller than that under the condition that the bulge is not arranged, and the specific pressure measurement range of the film type pressure sensing piece can be changed. Meanwhile, the bulge 3 has a certain supporting function when resisting a part of pressure acting between the sensing material layer 1 and the electrode layer 2, so that the thin film type pressure sensing piece is more stable in long-term use. Because arch 3 sets up between sensing material layer 1 and electrode layer 2, can also play the guard action to arch 3 through sensing material layer 1 and electrode layer 2 like this, prolong protruding 3's life.

It can be understood that the size, arrangement and arrangement density of the protrusions 3 may affect the pressure detection range of the thin film pressure sensing chip to some extent, and the thickness of the protrusions 3 may also affect the pressure detection range of the thin film pressure sensing chip. The effect is less obvious then to protruding 3's thickness is too thin, and protruding 3's thickness is too thick then can influence the testing result the utility model discloses in, protruding 3's thickness is less than the thickness of articulamentum 4. Preferably, the thickness of the protrusions 3 is set between 1 μm and 1mm, and typically between 50 μm and 500 μm may be selected, and more particularly, the thickness of the protrusions 3 is any one of 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, or 500 μm. In other embodiments, the thickness of the protrusion 3 may be equal to or greater than the thickness of the connection layer 4.

In the utility model, when a plurality of bulges 3 are needed to be arranged between the sensing material layer 1 and the electrode layer 2, as an implementation mode, the bulges 3 are uniformly distributed in a circumferential or array mode, and the thin film type pressure sensing piece can be stressed more uniformly by adopting the uniform distribution mode; as another embodiment, the plurality of protrusions 3 may be arranged in the same manner as the plurality of electrode units 21, for example, may be arranged at the same position around each electrode unit, and such an arrangement may ensure the uniformity of the pressure measurement range of each sensing unit on the film-type pressure sensing strip, so as to make the detection result more accurate.

The utility model discloses do not specifically limit to protruding 3's shape, protruding 3's cross sectional shape can be square, circular, triangle-shaped, polygon or other shapes. Preferably, the cross section of the protrusion 3 is square, and the square protrusion is convenient to process and manufacture and is also convenient to ensure the size consistency of the protrusion 3 during processing and manufacturing.

The utility model discloses do not do specific restriction to protruding 3's material, as long as the object body of the pressure that awaits measuring can resist partly when pressing on film formula pressure sensing piece and act on the pressure between sensing material layer 1 and the electrode layer 2 can. Preferably, the protrusion 3 is preferably an insulating plastic material, such as polyurethane, epoxy, or the like. The bulge 3 is made of insulating plastic materials, so that on one hand, the bulge is prevented from being conducted with the electrode to further interfere the signal output of the sensing unit, and on the other hand, the elastic deformation of the plastic when stressed is more prominent, and the practical application is more facilitated.

The utility model discloses do not do concrete restriction to protruding 3's manufacture craft equally. The bumps 3 may be formed on the sensing material layer or the electrode layer by injection molding, spraying, printing, or the like, or may be disposed on the sensing material layer or the electrode layer by adhesion.

Further, as shown in fig. 3a to 3c, the electrode layer 2 includes a plurality of electrode units 21 arranged in an array, the electrode units 21 are provided with two signal transmission lines 22, i.e., a positive signal transmission line and a negative signal transmission line, and when there is a cross point 23 between any two signal transmission lines 22, at least one protrusion 3 is disposed at the cross point 23 and is sandwiched between the two signal transmission lines 22, as shown in fig. 3b to 3c, so as to prevent the two signal transmission lines 22 from physically crossing and being conducted with each other. For example, when the electrode layer 2 is provided with a plurality of electrode units 21, in order to avoid crossing between the two signal transmission lines 22 and thereby causing signal communication between the two electrode units 21, a larger area on the film-type pressure sensing sheet is usually required to be reserved for arranging each signal transmission line 22; in order to make the arrangement between the signal transmission lines 22 more compact, the signal transmission lines 22 of the two electrode units 21 may pass through the same position, and a cross point 23 may be formed at the position, and if the cross positions are not separated, the signals of the two electrode units 21 may be communicated with each other. The utility model discloses set up the crosspoint 23 between two signal transmission line 22 in protruding 3 department, perhaps set up protruding 3 in crosspoint 23 department, specifically arrange crosspoint 23 department and press from both sides and establish between two signal transmission line. Therefore, the conduction of the two signal transmission lines at the intersection 3 can be isolated through the protrusion 3, so that the arrangement among the signal transmission lines 22 can be more compact, and meanwhile, other insulating materials are not required to be arranged to separate the two signal transmission lines 22. Further, the utility model discloses in, protruding 3's cross-sectional area is greater than the area of crosspoint 23 between two criss-cross signal transmission lines 22, like this through protruding 3 can be better completely cut off switch on between two signal transmission lines 22.

To sum up, the utility model discloses a set up a plurality of insulating archs with sensing unit dislocation place between the sensing material layer of film sense piece and the electrode layer, further can also press from both sides at the signal transmission line cross point department of electrode unit and establish at least one arch, the switching on of two signal transmission lines of accessible arch on the one hand in cross point department, the arch can also resist partial pressure in order to change the measurement range of film sense piece simultaneously.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can be considered to be within the technical scope of the present invention, and all equivalent substitutions or changes according to the technical solution of the present invention and the inventive concept thereof are also included in the scope of the present invention.

Claims (10)

1. A film type pressure sensing sheet comprises a sensing material layer, an electrode layer and a connecting layer, wherein the electrode layer is provided with at least one electrode unit, the connecting layer is arranged between the sensing material layer and the electrode layer so as to enable a certain gap to be kept between the sensing material layer and the electrode layer in an initial state, and the electrode unit and a sensing material which is right corresponding to the electrode unit form a sensing unit; it is characterized by also comprising a plurality of bulges made of elastic insulating materials; the bumps are arranged between the sensing material layer and the electrode layer and are arranged in a staggered manner with respect to the sensing units.

2. The thin film pressure sensing chip according to claim 1, wherein the electrode layer comprises a plurality of electrode units provided with signal transmission lines; when a cross point exists between any two signal transmission lines, at least one bulge is arranged at the cross point and clamped between the two signal transmission lines.

3. The thin film pressure sensing chip of claim 2, wherein a cross-sectional outer profile of the protrusion is larger than an outer profile of the intersection.

4. The thin film pressure sensing chip of claim 1, wherein the protrusions are arranged in a circular array or a rectangular array; or the arrangement mode of the bulges is the same as that of the electrode units.

5. The thin film pressure sensing chip of any one of claims 1 to 4, wherein the elastic insulating material is at least one of polyurethane and epoxy.

6. The thin film pressure sensor chip according to any one of claims 1 to 4, wherein the thickness of the protrusion is less than the thickness of the connection layer; the thickness of the projection is between 1 μm and 1 mm.

7. The thin film pressure sensing sheet of claim 6, wherein the thickness of the protrusion is between 50 μm-500 μm.

8. The thin film pressure sensing chip according to any one of claims 1 to 4, wherein the cross-section of the protrusion is rectangular, circular, semicircular, elliptical, triangular or regular polygonal.

9. The thin film pressure sensing chip of any one of claims 1 to 4, wherein the protrusion has a square cross-section.

10. The film-type pressure sensing chip according to any one of claims 1 to 4, wherein the protrusions are formed on the sensing material layer or the electrode layer by injection molding, spray coating or printing, or are disposed on the sensing material layer or the electrode layer by adhesion.

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