Patent Application
20240402024
The present invention relates generally to a sensor, and more specifically, to a sensor with plurality of sensor elements arranged regularly on a flexible substrate for frequently stretching, deforming application and circumstance.
Force sensors or pressure sensors are used in equipment required by long-term care or ergonomics application like medical mattress, cushion or back cushion for detecting and recording forces or pressures exerted and distributed on contact surfaces by disabled or physically challenged people, in order to prevent bedsore due to long-time pressure applied to soft tissue resulting in completely or partially obstructed blood flow to the soft tissue. The sensor may be formed on a thin, flat and flexible substrate, including multiple individual sensor elements arranged in rows and columns on the substrate. Forces acting at the sensor elements cause a corresponding change in the electrical resistance of the pressure sensitive ink, which may be subsequently detected by a control circuit through conductive traces electrically coupled to the sensor elements.
Since this kind of pressure sensor is applied in detecting pressure distribution on soft objects like mattress, cushion or pad, the flexible substrate with sensor elements distributed thereon is inevitably subject to irregular local deformation (e.g., curved, non-planar, etc.) resulted from the pressure exerted by users, which may affect the precision and accuracy of pressure detection. In addition, the flexible substrate is also required to have sufficient stretch property in order to provide comfort experience for a long time use. Currently, there are certain pattern designs in prior art, such as mesh design, spiral design, interlocking design or perforated design, to improve the stretchability of flexible substrate as well as minimize the impact of substrate deformation. Nevertheless, in actual implementation, it is very difficult to achieve excellent ability of stretch and anti-deformation at the same time even when using the aforementioned designs. Accordingly, those of skilled in the art still need to improve the design of flexible substrate and sensors in order to aid with the conformability of the sensor.
In the light of the aforementioned disadvantages in prior art, the present invention hereby provides a novel sensor with multiple sensor elements arranged on a flexible substrate for frequently stretching, deforming application, with features of perforations and open-ended moat-like cut-out areas arranged in a staggered array to create regular, alternating perforated patterns and patterns for active regions immune to the stretch and deformation of the flexible substrate, provided with both the advantages of mesh-type and spiral-type pattern designs.
The objective of present invention is to provide a sensor with plurality of sensor elements arranged on a flexible substrate, including a flexible substrate, multiple perforations formed in the flexible substrate, multiple open-ended moat-like cut-out areas formed in the flexible substrate, wherein the perforations and the open-ended moat-like cut-out areas are arranged in a staggered array on the flexible substrate, and each open-ended moat-like cut-out area defines an active area nearly enclosed by one open-ended moat-like cut-out area and connecting the flexible substrate through a bridge feature not enclosed by the open-ended moat-like cut-out area, and multiple sensor elements, wherein each sensor element is set on one active area.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
It should be noted that all the figures are diagrammatic. Relative dimensions and proportions of parts of the drawings have been shown exaggerated or reduced in size, for the sake of clarity and convenience in the drawings. The same reference signs are generally used to refer to corresponding or similar features in modified and different embodiments.
Reference will now be made in detail to exemplary embodiments of the invention, which are illustrated in the accompanying drawings in order to understand and implement the present disclosure and to realize the technical effect. It can be understood that the following description has been made only by way of example, but not to limit the present disclosure. Various embodiments of the present disclosure and various features in the embodiments that are not conflicted with each other can be combined and rearranged in various ways. Without departing from the spirit and scope of the present disclosure, modifications, equivalents, or improvements to the present disclosure are understandable to those skilled in the art and are intended to be encompassed within the scope of the present disclosure.
It should be readily understood that the meaning of “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner such that “on” not only means “directly on” something but also includes the meaning of “on” something with an intermediate feature or a layer therebetween, and that “above” or “over” not only means the meaning of “above” or “over” something but can also include the meaning it is “above” or “over” something with no intermediate feature or layer therebetween (i.e., directly on something). Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature relationship to another element(s) or feature(s) as illustrated in the figures.
In general, terminology may be understood at least in part from usage in context. For example, the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a,” “an,” or “the,” again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. Additionally, the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors, but may allow for the presence of other factors not necessarily expressly described, again depending at least in part on the context.
It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
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In the embodiment of present invention, perforations 104 formed in the flexible substrate 100 may provide flexible substrate 100 excellent and uniform stretchability. The active areas 100a defined by the open-ended moat-like cut-out area 102 are partially isolated and independent from the flexible substrate 100 with only a small bridge feature 100b partially connecting them with the flexible substrate 100, so that the active areas 100a (including the sensor elements to be formed thereon later) may be nearly unaffected or even immune to the deformation of surrounding flexible substrate 100 through the rotation and shift movement of active areas 100a. In addition, the arrangement of perforations 104 uniformly around every active area 100a may further improve this anti-deformation property.
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It should be appreciated that although in the embodiment described above, movement of each sensor element is substantially independent of movement of an adjacent sensor element, the present invention is not limited in this respect. For example, groups of two or more sensor elements may be constrained to move together, yet movement of a particular group of sensor elements is substantially independent of the movement of an adjacent sensor element or group of sensor elements.
In the embodiment of present invention, the conductive traces 108, 110 may be formed using any suitable technique. For example, methods for making flexible printed circuits may be employed. In this respect, the upper conductive trace 108 may be applied to the top substrate layer by directly printing an electrically conductive ink. Other methods may be used to fabricate the conductive trace including photo-etching copper or gold laminated to the flexible substrate or other suitable substrate material. Screen printing may also be used. The sensor elements 106 on the conductive traces 108, 110 may be formed by coating a pressure-sensitive ink. Pressure-sensitive inks are materials which can be printed or otherwise applied in a thin coating which serves to limit the current flowing therethrough. When forming the sensor to detect other parameters, such as temperature, other types of sensitive coatings, such as a temperature sensitive coating, may be employed.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
