Pressure sensing device

Abstract

A pressure sensing device according to an embodiment of the present invention comprises: an elastic dielectric part; a plurality of first electrode parts disposed on one surface of the elastic dielectric part and spaced apart from each other in a first direction; a plurality of second electrode parts disposed on the other surface of the elastic dielectric part and spaced apart from each other in a second direction; and a plurality of board parts disposed on the first electrode parts or the second electrode parts, wherein the plurality of first electrode parts and the plurality of second electrode parts form a plurality of overlap regions in a third direction perpendicular to the first direction and the second direction, and the board parts are disposed in each of the plurality of overlap regions.

Description

pressure sensing device

[0001] The present invention relates to a pressure sensing device.

[0002] Various types of sensors are being actively utilized to detect external factors and derive diverse results, such as calculations, judgments, and comparisons.

[0003] Pressure sensors are sensing modules that detect externally applied forces, capable of sensing the intensity of pressure applied to a detection area or whether pressure is being applied at all. While there are various methods for such pressure sensors, a commonly utilized approach involves placing an elastic dielectric between one electrode and another; pressure is measured based on the change in the distance between the electrodes as the elastic dielectric contracts in response to an external force applied to the electrodes.

[0004] However, there is a technical limitation in that pressure sensors based on changes in capacitance can minimize the detection area, and as a result, there is a problem in that pressure cannot be detected when pressure is applied to an area that is extremely narrow compared to the detection area, for example, a needle-like pressure.

[0005] The present invention is an invention devised to solve the problems of the aforementioned prior art, and has the objective of sensing pressure in an area significantly smaller than the sensing area.

[0006] The problems that the present invention aims to solve are not limited to those mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below.

[0007] A pressure sensing device according to an embodiment of the present invention for achieving the above-described purpose comprises an elastic dielectric portion, a plurality of first electrode portions disposed on one surface of the elastic dielectric portion and spaced apart in a first direction, a plurality of second electrode portions disposed on the other surface of the elastic dielectric portion and spaced apart in a second direction, and a plurality of board portions disposed on the first electrode portion or the second electrode portion, wherein the plurality of first electrode portions and the plurality of second electrode portions form a plurality of overlap areas in a third direction perpendicular to the first direction and the second direction, and the board portions are disposed in each of the plurality of overlap areas.

[0008] According to the present embodiment, the first electrode portion may be formed long in the second direction, and the second electrode portion may be formed long in the first direction.

[0009] According to the present embodiment, the plurality of overlap regions may be formed spaced apart in the second direction on the first electrode portion and spaced apart in the first direction on the second electrode portion.

[0010] According to the present embodiment, the area of ​​the board portion may be 0.8 times or more the area of ​​the overlap area.

[0011] According to the present embodiment, the center of the overlap area and the center of the board portion may not overlap in the third direction.

[0012] According to the present embodiment, the board portion includes a plurality of plate members, and the plurality of plate members may be spaced apart from each other on the overlap area.

[0013] According to the present embodiment, a sensing unit that senses pressure according to a change in the distance between the first electrode part and the second electrode part of the overlap area in the third direction may be further included.

[0014] According to the present embodiment, the thickness of the board portion in the third direction may be proportional to the minimum pressure value sensed by the sensing portion based on the unit area of ​​the overlap area.

[0015] According to the present embodiment, the thickness of the board portion in the third direction may be 1.5 to 2.5 times the minimum pressure value sensed by the sensing portion based on the unit area of ​​the overlap area.

[0016] According to the present embodiment, the board portion may be a non-dielectric material of a rigid material.

[0017] According to the present embodiment, a shield portion is further included that is positioned facing the plurality of first electrode portions or the plurality of second electrode portions in the third direction, and the board portion is positioned between the shield portion and the first electrode portion or the second electrode portion in the third direction.

[0018] According to the present embodiment, an adhesive may be disposed on at least one of the first contact surface of the shield portion and the board portion, and the second contact surface of the board portion and the first electrode portion or the second electrode portion.

[0019] According to the present embodiment, an adhesive may not be disposed between the board portion and the first electrode portion or the second electrode portion.

[0020] A pressure sensing device according to an embodiment of the present invention for solving the above problem may have the effect of sensing pressure in an area significantly smaller than the sensing area.

[0021] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0022] In addition, the effects of the present invention may be described in more detail in the detailed description of the present invention and are not necessarily limited to those presented above.

[0023] The summary described above, as well as the detailed description of the preferred embodiments of the present application described below, will be better understood when read in conjunction with the accompanying drawings.

[0024] Preferred embodiments are illustrated in the drawings for the purpose of illustrating the present invention.

[0025] However, it should be understood that the present application is not limited to the exact arrangement and means depicted.

[0026] FIG. 1 is a drawing illustrated for the overall explanation of a pressure sensing device according to an embodiment of the present invention;

[0027] FIG. 2 is a drawing illustrating the overlap area of ​​a pressure sensing device according to an embodiment of the present invention;

[0028] FIG. 3 is a drawing illustrating the arrangement of the board portion of a pressure sensing device according to an embodiment of the present invention;

[0029] FIG. 4 is a cross-sectional view of a pressure sensing device according to an embodiment of the present invention;

[0030] FIG. 5 is a drawing illustrating a comparison of the areas of the sensing region and the pressure region of a pressure sensing device according to the prior art;

[0031] FIG. 6 is a drawing illustrating a comparison of the areas of a sensing region and a pressure region of a pressure sensing device according to an embodiment of the present invention;

[0032] FIG. 7 is a drawing illustrating the pressure sensing measurement of a pressure sensing device according to an embodiment of the present invention compared with the prior art;

[0033] FIG. 8 is a drawing illustrating the result of FIG. 7 of a pressure sensing device according to an embodiment of the present invention; and

[0034] FIG. 9 is a drawing illustrating the board portion of a pressure sensing device according to another embodiment of the present invention.

[0035] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. In describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions may obscure the essence of the present invention.

[0036] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0037] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0038] Furthermore, throughout the specification, when the term "connected" is used, it does not mean only that two or more components are directly connected, but may also mean that two or more components are indirectly connected through other components, that they are connected not only physically but also electrically, or that they are a single unit although referred to by different names depending on their location or function.

[0039] Furthermore, when described as being formed or placed on the “top or bottom” of each component, “top or bottom” includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as “top or bottom,” it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0040] Preferred embodiments of the present invention, in which the purpose of the present invention can be specifically realized, can be explained below through the attached FIGS. 1 to 9.

[0041] Specifically, FIG. 1 is a drawing illustrating an overall description of a pressure sensing device according to an embodiment of the present invention, FIG. 2 is a drawing illustrating an overlap area of ​​a pressure sensing device according to an embodiment of the present invention, FIG. 3 is a drawing illustrating an arrangement of a board portion of a pressure sensing device according to an embodiment of the present invention, FIG. 4 is a drawing illustrating a cross-sectional view of a pressure sensing device according to an embodiment of the present invention, FIG. 5 is a drawing illustrating an area comparison between a detection area and a pressure area of ​​a pressure sensing device according to the prior art, FIG. 6 is a drawing illustrating an area comparison between a detection area and a pressure area of ​​a pressure sensing device according to an embodiment of the present invention, FIG. 7 is a drawing illustrating a pressure sensing measurement of a pressure sensing device according to an embodiment of the present invention with respect to the prior art, FIG. 8 is a drawing illustrating a result for FIG. 7 of a pressure sensing device according to an embodiment of the present invention, and FIG. 9 is a drawing illustrating a board portion of a pressure sensing device according to another embodiment of the present invention.

[0042] First, as shown in FIG. 1, a pressure sensing device according to an embodiment of the present invention may include an elastic dielectric part (100), a plurality of first electrode parts (200) disposed on one side of the elastic dielectric part (100) and spaced apart in a first direction, a plurality of second electrode parts (300) disposed on the other side of the elastic dielectric part (100) and spaced apart in a second direction, and a plurality of board parts (400) disposed on the first electrode part (200) or the second electrode part (300).

[0043] Here, the elastic dielectric part (100) may be a dielectric made of an elastic material, contracts due to pressure applied in a third direction, and can be restored to its original state when the pressure is removed after contraction.

[0044] Meanwhile, the first electrode part (200) and the second electrode part (300) may be respectively placed on one side and the other side of the elastic dielectric part (100), that is, on one side and the other side facing each other in a third direction, and a plurality of the first electrode part (200) may be spaced apart in a first direction on one side of the elastic dielectric part (100), and a plurality of the second electrode part (300) may be spaced apart in a second direction on the other side of the elastic dielectric part (100).

[0045] At this time, the first electrode portion (200) may be formed long in the second direction, and the second electrode portion (300) may be formed long in the first direction.

[0046] Referring to FIG. 2 for a more detailed explanation, as shown in FIG. 2, the first electrode portion (200) may be disposed on one side of the elastic dielectric portion (100), and the second electrode portion (300) may be disposed on the other side of the elastic dielectric portion (100).

[0047] Here, an overlap area (O) in which the first electrode part (200) and the second electrode part (300) overlap each other in a third direction is formed on each of the first electrode part (200) and the second electrode part (300), and the board part (400) can be placed in the aforementioned overlap area (O).

[0048] Alternatively, a plurality of first electrode portions (200) are spaced apart in a first direction and a plurality of second electrode portions (300) are spaced apart in a second direction, and since the first electrode portion (200) is formed long in the second direction and the second electrode portion (300) is formed long in the first direction, a plurality of overlap areas (O) that overlap with a plurality of second electrode portions (300) in a third direction are formed in a single first electrode portion (200), and a plurality of overlap areas (O) that overlap with a plurality of first electrode portions (200) in a third direction can also be formed in the second electrode portion (300).

[0049] At this time, a plurality of overlap regions (O) may be spaced apart in the second direction on the first electrode portion (200) and formed spaced apart in the first direction on the second electrode portion (300). That is, a plurality of overlap regions (O) may be spaced apart along the longitudinal direction of the first electrode portion (200) on the first electrode portion (200) and spaced apart along the longitudinal direction of the second electrode portion (300) on the second electrode portion (300).

[0050] Here, a plurality of board sections (400) may be disposed in each of the plurality of overlap areas (O) of the first electrode section (200) described above, or in each of the plurality of overlap areas (O) of the second electrode section (300), or in each of the plurality of overlap areas (O) of the first electrode section (200) and the second electrode section (300).

[0051] At this time, the plurality of board sections (400) disposed in the plurality of overlap areas (O) may be disposed on the first electrode section (200) when measuring changes in the first electrode section (200), disposed on the second electrode section (300) when measuring changes in the second electrode section (300), and disposed in each of the plurality of overlap areas (O) formed on the first electrode section (200) and the second electrode section (300) when measuring changes in both the first electrode section (200) and the second electrode section (300). That is, the board section (400) may be disposed in various ways depending on the intended use for measurement.

[0052] Here, the first electrode part (200) and the second electrode part (300) facing each other are arranged to intersect at one point. In the detailed description of the invention, to aid in understanding the arrangement and effect, an overlap area (O) is shown that intersects perpendicularly in a third direction. However, the second electrode part (300) may be arranged at an angle relative to the first electrode part (200) so that the overlap area (O) takes on a rhombus shape, and the arrangement is not necessarily limited to what has been mentioned and illustrated.

[0053] That is, in the pressure sensing device according to the embodiment of the present invention, the first direction, the second direction, and the third direction are described and illustrated as being perpendicular to each other, but if necessary, the first direction and the second direction may not be perpendicular to each other, and are not necessarily limited to what has been mentioned and illustrated.

[0054] Additionally, the pressure sensing device according to an embodiment of the present invention may further include a sensing unit that senses a change in capacitance according to a change in distance between a first electrode part (200) and a second electrode part (300) in a third direction, and the sensing unit may sense the presence or absence and intensity of pressure according to a change in the first electrode part (200) and the second electrode part (300).

[0055] Meanwhile, as shown in FIG. 3, a board portion (400) is placed in the overlap area (O), and the first electrode portion (200) and the second electrode portion (300) can be freely placed on the overlap area (O) where they overlap in a third direction.

[0056] That is, as shown in FIG. 3, the center point (C) of the overlap area (O) and the center point (C-1) of the board part (400) may be positioned in the exact center so as to overlap each other, or the center point (C) of the overlap area (O) and the center point (C-1) of the board part (400-1) may be positioned eccentrically without overlapping in the third direction.

[0057] To explain this in more detail, the center (C) of the overlap area (O) in the form of a center-arranged shape and the center (C) of the board part (400) form the same center (C). However, if the board part (400-1) is eccentrically arranged with respect to the overlap area (O), the center (C) of the overlap area (O) and the center (C-1) of the board part (400-1) may not overlap in a third direction and may be arranged in different areas. That is, if the board part (400-1) is placed on the overlap area (O), even if the center (C-1) of the board part (400-1) and the center (C) of the overlap area (O) are misaligned with each other, the change in capacitance according to the change in distance between the first electrode part (200) and the second electrode part (300) can be easily sensed.

[0058] However, it is preferable that the area of ​​the board portion (400) be at least 80% of the area of ​​the overlap area (O), and at least 80%, preferably 85%, and more preferably 90%. This will be explained further through the drawings described later.

[0059] Meanwhile, as shown in FIG. 4, when looking at the cross-sectional view of the pressure sensing device according to an embodiment of the present invention, the first electrode part (200) is spaced apart in the first direction with respect to the elastic dielectric part (100), the second electrode part (300) is spaced apart in the second direction, and the board part (400) can be placed on the overlap area (O) where the first electrode part (200) and the second electrode part (300) overlap in the third direction.

[0060] At this time, in order to facilitate a smoother understanding, the detailed description of the present invention describes that a plurality of board portions (400) are respectively arranged in each of the overlap areas (O), more specifically in the plurality of overlap areas (O) formed on the first electrode portion (200) and the plurality of overlap areas (O) formed on the second electrode portion (300), but as described above, it may not be limited thereto.

[0061] As illustrated in FIG. 4, the board portion (400) placed on the first electrode portion (200) is described as the first board portion (410), and the board portion (400) placed on the second electrode portion (300) is described as the second board portion (420). When the first board portion (410) and the second board portion (420) are placed as described above, the first board portion (410) and the second board portion (420) can also be placed so as to overlap in the third direction. This may be because the board portion (400) is placed on the overlap area (O).

[0062] At this time, if an object applying pressure comes into direct contact with the board part (400), the probability of damage to the board part (400) is high, and if pressure is applied to an area where the first electrode part (200) and the second electrode part (300) do not intersect, which is not the overlap area (O), pressure cannot be sensed, so a shield part (500) can be placed on the upper part of the board part (400).

[0063] More specifically, based on the elastic dielectric part (100), the first electrode part (200), the first board part (410), and the first shield part (510) may be sequentially stacked in a third direction on the upper surface of the elastic dielectric part (100), and the second electrode part (300), the second board part (420), and the second shield part (520) may be arranged in a third direction on the other surface of the elastic dielectric part (100).

[0064] Alternatively, if the direction toward the first shield part (510) is described as the 3-1 direction and the direction toward the second shield part (520) is described as the 3-2 direction based on the elastic dielectric part (100), the elastic dielectric part (100), the first electrode part (200), the first board part (410), and the first shield part (510) may be sequentially arranged in the 3-1 direction, and the elastic dielectric part (100), the second electrode part (200), the second board part (420), and the second shield part (520) may be sequentially arranged in the 3-2 direction. That is, the first board part (410) may be placed between the first shield part (510) and the first electrode part (200) in the 3-1 direction, and the second board part (420) may be placed between the second shield part (520) and the second electrode part (300) in the 3-2 direction.

[0065] In addition, the 3-1 direction was explained based on the elastic dielectric part (100), but it may be preferable to interpret the direction from the lower side to the upper side as the 3-1 direction and the direction from the upper side to the lower side as the 3-2 direction based on FIG. 4. However, since the 3rd direction includes both the 3-1 direction and the 3-2 direction, even if explained as the 3rd direction, it may be preferable to interpret it according to the arrangement relationship of the pressure sensing device according to the embodiment of the present invention with reference to the drawings among the 3-1 direction and the 3-2 direction.

[0066] At this time, if the second board part (420) is not placed, the second electrode part (300) and the second shield part (520) may come into contact in a third direction.

[0067] Here, the thickness (T) of the first board part (410) and the thickness (T) of the second board part (420) in the third direction may differ from each other, but may be 1.3 to 2.8 times the minimum pressure value in proportion to the minimum pressure value sensed by the sensing part based on the unit area of ​​the overlap area (O). More preferably, it may be 1.5 to 2.5 times, and even more preferably, 1.8 to 2.2 times.

[0068] For example, the unit of pressure is kgf / cm^2, and if the minimum pressure value is 0.3 kgf / cm^2, the minimum pressure value that can be sensed per unit area cm^2 is 0.3 kgf, so it can be 0.45T to 0.75T, which is 1.5 to 2.5 times 0.3. More preferably, it can be 0.54T to 0.66T, which is 1.8 to 2.2 times the minimum pressure value sensed per unit area. Here, T used as the unit of thickness (T) can be mm.

[0069] This is because if the thickness (T) of the board portion (400) is not sufficiently thick, the minimum pressure applied to the board portion (400) may not sufficiently press the first electrode portion (200) due to the excessively low thickness (T), or the pressure may be offset on the board portion (400) side due to the excessively thick thickness (T), so the thickness (T) of the board portion (400) that satisfies the above-described range is the most desirable.

[0070] For a specific comparison regarding this, refer to FIG. 5 and FIG. 6. When the board portion (400) is not placed, if the pressure area (PA) is excessively small compared to the area (SA) of the overlap area (O), the pressure transmitted from the pressure body (P) is concentrated only on a part of the first electrode portion (200), and due to the elasticity of the elastic dielectric portion (100), the change in the first electrode portion (200) is small, so the pressure may not be properly sensed, or a problem may occur where a pressure that is too low compared to the applied pressure is sensed.

[0071] That is, since this is a problem that occurs because the pressure area (PA) of the pressure body (P) is excessively small compared to the area (SA) of the overlap area (O) which is the sensing area, a method of minimizing the overlap area (O) by reducing the area of ​​the first electrode part (200) and the second electrode part (300) and a method of reducing the thickness of the elastic dielectric part (100) in the third direction can be utilized.

[0072] However, reducing the width of the first electrode part (200) and the second electrode part (300) requires advanced technical skills and high expertise and precision in the assembly process, and if the thickness of the elastic dielectric part (100) in the third direction is reduced, it may cause problems in detecting high pressure, so there may be issues with simply using the methods described above to solve the problem.

[0073] On the other hand, in the pressure sensing device according to the embodiment of the present invention, even if the pressure area (PA) of the pressurizing body (P) is excessively small compared to the area (SA) of the overlap area (O), the pressure applied to the board part (400) is transmitted to the entire first electrode part (200) on the overlap area (O), so that low pressure can be effectively sensed. To this end, it may be preferable for the board part (400) to be a non-dielectric material of a rigid material.

[0074] In other words, to achieve this effect, it is desirable that the area of ​​the board part (400) be 80% or more of the area of ​​the overlap area (O) as explained in FIG. 3 above. Even if the center points (C) do not overlap each other, the pressure is distributed and transmitted throughout the overlap area (O), so it can be said to be more effective as it does not require an assembly process that requires a high level of concentration, technical skill, and expertise.

[0075] Based on this, and with reference to FIG. 3, the board portion (400) is positioned between the shield portion (500) and the first electrode portion (200) in the third direction, the board portion (400) is in contact with the shield portion (500) in the third-1 direction and with the first electrode portion (200) in the third-2 direction, and since the center point (C-1) of the board portion (400-1) does not necessarily have to be the same as the center point (C) of the overlap area (O), the board portion (400) and the first electrode portion (200) are not bonded to each other during the assembly process, and only the first electrode portion (200) and the elastic dielectric portion (100), and the shield portion (500) and the board portion (400) can be bonded to each other.

[0076] That is, an adhesive is placed and bonded to at least one of the contact surface between the shield portion (500) and the board portion (400), or the contact surface between the board portion (400) and the first electrode portion (200) or the second electrode portion (300), but if necessary, an adhesive may not be placed on the contact surface between the board portion (400) and the first electrode portion (200) or the contact surface between the board portion (400) and the second electrode portion (300).

[0077] Through this, the board portion (400) can effectively sense low pressure, so there is no need to require technical skills to make the width of the first electrode portion (200) and the second electrode portion (300) extremely narrow or to make the thickness of the elastic dielectric portion (100) thin, and there is no need for the center point (C) of the overlap area (O) and the center point (C-1) of the board portion (400-1) to be aligned equally, so there is no need to require technical skills, which has the advantage of high productivity and a low probability of defective products.

[0078] Meanwhile, to more effectively compare the present invention with the prior art, refer to FIGS. 7 and FIGS. 8. It can be seen that the pressure sensing device according to the embodiment of the present invention, in which the board part (400) is arranged as shown in FIGS. 7, and the pressure sensing device according to the prior art, in which the board part (400) is not arranged, have the same result as FIGS. 8.

[0079] To explain in more detail, when the same pressure is applied, FIG. 7(a) is a pressure sensing device according to the prior art in which a pressure body (P) with a large area is applied to the overlap area (O), and this can be interpreted as the first electrode part (200) being substantially pressed by the pressure body (P) even though the first shield part (510) exists. FIG. 7(b) is a pressure sensing device according to an embodiment of the present invention in which a pressure body (P) with a large area is applied to the overlap area (O), and this can be interpreted as the board part (400) being preferentially pressed by the pressure body (P) before the first electrode part (200) is pressed.

[0080] Additionally, FIG. 7(c) shows a pressure sensing device according to the prior art in which a pressure body (P) with a narrow area pressurizes the overlap area (O), and this can be interpreted as the first electrode part (200) being pressurized by the pressure body (P) even though the first shield part (510) exists. FIG. 7(d) shows a pressure sensing device according to an embodiment of the present invention in which a pressure body (P) with a narrow area pressurizes the overlap area (O), and this can be interpreted as the board part (400) being pressurized by the pressure body (P) preferentially before the first electrode part (200) is pressurized.

[0081] That is, there may be a difference between a pressure sensing device according to the prior art and a pressure sensing device according to an embodiment of the present invention regarding which configuration receives pressure preferentially when pressure is substantially applied.

[0082] In this regard, as shown in FIG. 8, FIG. 7(a) for a pressure sensing device according to the prior art has a capacitance of 11.91 pF before pressurization, but after pressurization by a large-area pressurizing body (P), it can be seen that it has a change in dielectric constant of 17.05 pF, and the rate of change in capacitance is 43.16%, indicating that pressure change detection was easy.

[0083] In addition, FIG. 7(b) regarding the pressure sensing device according to the embodiment of the present invention shows that it has a capacitance of 11.85 pF before pressurization, but has a dielectric constant change of 17.03 pF after being pressurized by a large-area pressurizing body (P). It can be seen that the change rate of the capacitance is 43.71%, indicating that pressure change detection was easy. Although a relatively higher change rate occurred compared to FIG. 7(a), considering this to be within an error range of 5%, it can be seen that in the case of a large area, both the pressure sensing device according to the embodiment of the present invention and the pressure sensing device according to the prior art have no difficulty in sensing pressure.

[0084] Meanwhile, Figure 7(c) regarding a pressure sensing device according to the prior art shows that it has a capacitance of 11.84 pF before pressurization, but has a dielectric constant change of 12.44 pF after pressurization by a pressure body (P) with a narrow area, and it can be seen that the rate of change in capacitance is 5.07%, indicating that pressure change detection is significantly low.

[0085] In contrast, FIG. 7(d) for a pressure sensing device according to an embodiment of the present invention can be seen to have a capacitance of 11.97 pF before pressurization, but a change in dielectric constant of 15.23 pF after pressurization by a pressure body (P) of a narrow area, and it can be seen that the change rate of capacitance was 27.23%, making it easy to detect pressure changes.

[0086] It can be confirmed that there is a significant difference in the rate of change when compared to the prior art. While the prior art has a problem in sensing the pressure of a pressure body (P) in a narrow area, the present invention effectively overcomes this and can be confirmed to have a significant effect in sensing the pressure of a pressure body (P) in a narrow area.

[0087] Meanwhile, as illustrated in FIG. 9, in another embodiment of the present invention, the pressure sensing device may include a board portion (400) comprising a plurality of plate members (430), and the plurality of plate members (430) may be arranged on a single overlap area (O). The total area of ​​the plurality of plate members (430) may also have a total area of ​​80% relative to the area of ​​the overlap area (O). When the plurality of plate members (430) have a total area of ​​80% relative to the overlap area on the overlap area (O), they may not necessarily be spaced apart by the same distance or arranged in a regular manner.

[0088] We have examined preferred embodiments according to the invention, and it is obvious to those skilled in the art that, in addition to the embodiments described above, the invention may be embodied in other specific forms without departing from the spirit or scope thereof.

[0089] Therefore, the embodiments described above should be regarded as exemplary rather than limiting, and accordingly, the present invention is not limited to the description above but may be modified within the scope of the appended claims and their equivalents.

Claims

1. Elastic dielectric; A plurality of first electrode portions disposed on one surface of the above-mentioned elastic dielectric portion and spaced apart in a first direction; A plurality of second electrode portions disposed on the other surface of the above-mentioned elastic dielectric portion and spaced apart in a second direction; and It includes a plurality of board portions disposed on the first electrode portion or the second electrode portion, and The plurality of first electrode portions and the plurality of second electrode portions form a plurality of overlap regions in a third direction perpendicular to the first direction and the second direction, and The above board portion is a pressure sensing device disposed in each of the plurality of overlap regions.

2. In Paragraph 1, The first electrode portion is formed to be elongated in the second direction, and The above second electrode portion is a pressure sensing device formed long in the above first direction.

3. In Paragraph 2, The plurality of overlap regions are formed spaced apart in the second direction on the first electrode portion, and A pressure sensing device formed spaced apart in the first direction on the second electrode portion.

4. In Paragraph 1, A pressure sensing device in which the area of ​​the board portion is at least 0.8 times the area of ​​the overlap area.

5. In Paragraph 4, A pressure sensing device in which the center of the above-mentioned overlap area and the center of the above-mentioned board part do not overlap in the above-mentioned third direction.

6. In Paragraph 1, A pressure sensing device further comprising a sensing unit that senses pressure according to a change in the distance between the first electrode part and the second electrode part of the overlap area in the third direction.

7. In Paragraph 6, A pressure sensing device in which the thickness of the board portion in the third direction is proportional to the minimum pressure value sensed by the sensing portion based on the unit area of ​​the overlap area.

8. In Paragraph 7, A pressure sensing device in which the thickness of the board portion in the third direction is 1.5 to 2.5 times the minimum pressure value sensed by the sensing portion based on the unit area of ​​the overlap area.

9. In Paragraph 1, It further includes a shield portion disposed facing the plurality of first electrode portions or the plurality of second electrode portions in the third direction, and The above board portion is a pressure sensing device disposed between the shield portion and the first electrode portion or the second electrode portion in the above third direction.

10. In Paragraph 9, A pressure sensing device in which an adhesive is disposed on at least one of the first contact surface of the shield portion and the board portion, and the second contact surface of the board portion and the first electrode portion or the second electrode portion.

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