JP2016209148A - Antibacterial cloth-like transducer and bedding using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly flexible cloth-like transducer, and a device using a signal from the transducer and/or a device that functions when an electric signal is input.SOLUTION: In a bedding using a transducer including piezoelectric units arranged on roughly the same plane so that a conductive fiber B and a piezoelectric fiber A are electrically connected, the conductive fiber in the piezoelectric unit is arranged so as not to be electrically connected to the conductive fiber B and/or the piezoelectric fiber A in the other piezoelectric units. A bacteriostatic activity value of the transducer is 2.2 or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transducer that outputs an electric signal and / or changes its shape by inputting an electric signal by changing its shape due to an external force. More particularly, the present invention relates to a bedding using a fabric-like transducer characterized by being able to change shape flexibly and three-dimensionally.

In recent years, so-called wearable sensors have attracted attention, and products such as glasses and watches have begun to appear in the world. However, these devices have a feeling that they are worn, and a cloth-like shape, that is, a clothing-like shape that is the ultimate wearable is desired. As such a sensor, a sensor in which a piezoelectric element is attached to a cloth and a signal is extracted therefrom is disclosed (Patent Documents 1 and 2). However, since these require a separate structure on the surface of the woven or knitted fabric, it is difficult to adapt to a free-form surface, the touch is poor, and there is a lack of practicality such as problems in handling, workability, and workability. . In addition, there is a film-like structure made of a piezoelectric material and a conductive material (Patent Document 3), but this is also difficult to adapt to a free-form surface, has poor tactile feel, and is easy to handle. , Lack of practicality, such as causing problems in workability and workability.
Furthermore, although a sensor (Patent Document 4) for detecting resistance between conductive fibers has been proposed as a fabric sensor composed of only fibers, it detects pressure on the fabric and directly detects a change in shape. It was not a thing. Further, Patent Document 5 discloses a piezoelectric element that includes two conductive fibers and one piezoelectric fiber, which include piezoelectric units arranged on substantially the same plane while having contact with each other. ing. However, for example, when actually used as a wearable sensor in bedding such as a sheet, a pillow, or a bed, a cloth-like piezoelectric element having excellent antibacterial properties has been demanded.

Special table 2007-518886 JP-A-6-323929 JP 2002-203996 A JP 2006-284276 A International Publication No. 2014/058077

  An object of the present invention is to provide a fabric-like transducer which is rich in flexibility and excellent in antibacterial properties by using a fiber material and producing a conventional woven or knitted structure. Furthermore, it is to provide a device that uses a signal from the transducer and / or a device that functions by inputting an electric signal.

  The present inventors have discovered that the combination shape of conductive fibers and piezoelectric fibers may function as a piezoelectric element having antibacterial properties, and this can be applied to bedding such as sheets, pillows, and beds. Was completed.

That is, the present invention includes the following inventions.
1. A transducer comprising a piezoelectric unit in which conductive fibers and piezoelectric fibers are arranged in substantially the same plane so as to provide an electrical connection, wherein the conductive fibers in the piezoelectric unit are in other piezoelectric units. Bedding using a transducer which is arranged so as not to be electrically connected to the conductive fibers and / or piezoelectric fibers of the transducer and has an antibacterial activity value of 2.2 or more.
2. 2. The bedding according to 1 above, wherein 50% or more of the fibers constituting the transducer that are not in contact with the conductive fibers used as the piezoelectric unit are made of piezoelectric fibers.
3. 2. The bedding according to 1 above, wherein in the piezoelectric unit, the conductive fiber and the piezoelectric fiber have a contact point that physically contacts each other.
4). The bedding according to claim 1, wherein insulating fibers are arranged so that the conductive fibers in the piezoelectric unit are not electrically connected to conductive fibers and / or piezoelectric fibers in other piezoelectric units.
5. The bedding according to 1 above, wherein the piezoelectric fiber mainly contains polylactic acid.
6). 2. The bedding according to 1 above, wherein the piezoelectric fiber mainly contains poly-L-lactic acid or poly-D-lactic acid having an optical purity of 99% or more.
7). 2. The bedding according to 1 above, wherein the piezoelectric fibers are uniaxially oriented and include crystals.
8). The bedding according to 1 above, wherein the conductive fiber is a metal-plated fiber.
9. The bedding according to claim 1, wherein the transducer is a woven or knitted fabric containing a plurality of the piezoelectric units.
10. 10. The bedding according to 9, wherein the transducer is a woven fabric containing a plurality of the piezoelectric units, and the woven structure is any one of a plain weave, a twill weave, a satin weave, and a composite structure thereof.
11. 11. The bedding according to 10 above, wherein the transducer is a combination of a plurality of the woven and knitted fabrics.
12 The transducer;
Amplifying means for amplifying an electrical signal output from the transducer in response to an applied pressure;
Output means for outputting the electrical signal amplified by the amplification means;
The bedding according to any one of the above 1 to 11, comprising a device comprising:
13. 13. The bedding according to claim 12, wherein the device further includes transmission means for transmitting an electrical signal output from the output means to an external device.
14 The transducer;
Transmitting means for transmitting an electrical signal output from the transducer in response to an applied stress to an external device;
The bedding according to any one of the above 1 to 11, comprising a device comprising:

  According to the present invention, a fabric-like transducer having high flexibility and excellent antibacterial properties can be obtained by using a fiber material and producing a conventional woven or knitted structure. Since the transducer according to the present invention is flexible, it is possible to realize a transducer that can input and output electric signals of any shape that can be realized by a foldable cloth shape such as a handkerchief, or a cloth shape. Furthermore, a device that uses a signal from the transducer and / or a device that functions by inputting an electric signal can be realized.

1 is a schematic diagram of a circuit using the fabric of Example 1. FIG. It is a schematic diagram of the circuit using the textile fabric of Example 2. It is a schematic diagram of the circuit using the textile fabric of a comparative example. It is a schematic diagram of a sheet. It is a block diagram which shows the 1st specific example of the device using the transducer of this invention. It is a block diagram which shows the 2nd specific example of the device using the transducer of this invention.

  An object of the present invention is to provide an antibacterial transformer that outputs an electrical signal composed of a piezoelectric element including a piezoelectric unit in which conductive fibers and piezoelectric fibers are arranged on substantially the same plane so as to provide electrical connection. Achieved by a duer. Each configuration will be described below.

(Conductive fiber)
Any known conductive fibers may be used as long as they exhibit electrical conductivity. For example, metal fibers, conductive polymer fibers, carbon fibers, fibrous or granular conductive fillers are dispersed. Examples thereof include fibers made of a polymer made to be polymerized, or fibers in which a conductive layer is provided on the surface of a fibrous material. Examples of the method for providing a conductive layer on the surface of the fibrous material include a metal coat, a conductive polymer coat, and winding of conductive fibers. Among these, a metal coat is preferable from the viewpoint of conductivity, durability, flexibility and the like. Specific methods for coating the metal include vapor deposition, sputtering, electrolytic plating, and electroless plating, but plating is preferable from the viewpoint of productivity. Such a metal-plated fiber can be referred to as a metal-plated fiber.

  As a base fiber coated with a metal, a known fiber can be used regardless of conductivity, for example, polyester fiber, nylon fiber, acrylic fiber, polyethylene fiber, polypropylene fiber, vinyl chloride fiber, aramid fiber, In addition to synthetic fibers such as polysulfone fibers, polyether fibers and polyurethane fibers, natural fibers such as cotton, hemp and silk, semi-synthetic fibers such as acetate, and regenerated fibers such as rayon and cupra can be used. The base fibers are not limited to these, and known fibers can be arbitrarily used, and these fibers may be used in combination. Any metal may be used as long as the metal coated on the base fiber exhibits conductivity and exhibits the effects of the present invention.

  For example, gold, silver, platinum, copper, nickel, tin, zinc, palladium, indium tin oxide, copper sulfide, and a mixture or alloy thereof can be used. Among these, silver or copper, or a material containing silver or copper is preferable from the viewpoint of antibacterial properties.

  As the conductive fiber, a multifilament in which a plurality of filaments are bundled, or a monofilament composed of a single filament may be used. The use as a multifilament is preferable from the viewpoint of long stability of electrical characteristics. When used as a monofilament, the yarn diameter is 1 μm to 5000 μm, preferably 50 μm to 1000 μm. When used as a multifilament, the single yarn diameter is 0.1 μm to 5000 μm, preferably 2 μm to 100 μm. More preferably, it is 3 micrometers-50 micrometers. The number of filaments of the multifilament is preferably 1 to 100,000, more preferably 5 to 500, and still more preferably 10 to 100.

  If the diameter is small, the strength is lowered and handling becomes difficult, and if the diameter is large, flexibility is sacrificed. The cross-sectional shape of the conductive fiber is preferably a circle or an ellipse from the viewpoint of the design and manufacture of the piezoelectric element, but is not limited thereto.

Moreover, in order to efficiently extract the electrical output from the piezoelectric polymer, the electrical resistance is preferably low, and the volume resistivity is preferably 10 ⁻¹ Ω · cm or less, more preferably 10 ⁻² Ω · cm. cm or less, more preferably 10 ⁻³ Ω · cm or less. However, the resistivity of the conductive fiber is not limited as long as strength is obtained for signal detection.

(Piezoelectric fiber)
The piezoelectric fiber is a fiber having piezoelectricity. The piezoelectric fiber is preferably made of a piezoelectric polymer. As the piezoelectric polymer, any polymer exhibiting piezoelectricity such as polyvinylidene fluoride and polylactic acid can be used, but it is preferable that polylactic acid is mainly contained. Polylactic acid is easily oriented by stretching after melt spinning and exhibits piezoelectricity, and is excellent in productivity in that it does not require an electric field alignment treatment required for polyvinylidene fluoride and the like. Furthermore, the piezoelectric fiber made of polylactic acid has a small polarization due to its tensile or compressive stress in the axial direction, and it is difficult to function as a piezoelectric element, but a relatively large electrical output can be obtained depending on the shear stress, This is preferable in the piezoelectric element of the present invention having a structure that can easily apply a shear stress to the piezoelectric polymer.

  The piezoelectric polymer preferably contains mainly polylactic acid. “Mainly” means preferably 90 mol% or more, more preferably 95 mol% or more, and still more preferably 98 mol% or more.

  As polylactic acid, depending on its crystal structure, poly-L-lactic acid obtained by polymerizing L-lactic acid and L-lactide, D-lactic acid, poly-D-lactic acid obtained by polymerizing D-lactide, and those There are stereocomplex polylactic acid having a hybrid structure, and any of them can be used as long as it exhibits piezoelectricity. From the viewpoint of high piezoelectricity, poly-L-lactic acid and poly-D-lactic acid are preferable. Since poly-L-lactic acid and poly-D-lactic acid are reversed in polarization with respect to the same stress, they can be used in combination according to the purpose.

  The optical purity of polylactic acid is preferably 99% or more, more preferably 99.3% or more, and further preferably 99.5% or more. When the optical purity is less than 99%, the piezoelectricity may be remarkably lowered, and it may be difficult to obtain a sufficient electric output due to the shape change of the piezoelectric fiber. The piezoelectric polymer mainly contains poly-L-lactic acid or poly-D-lactic acid, and the optical purity thereof is preferably 99% or more.

  The piezoelectric fiber is preferably uniaxially oriented in the fiber axis direction of the fiber and contains crystals, more preferably uniaxially oriented polylactic acid having crystals. This is because polylactic acid exhibits large piezoelectricity in its crystalline state and uniaxial orientation.

  Since polylactic acid is a polyester that hydrolyzes relatively quickly, a known hydrolysis inhibitor such as an isocyanate compound, an oxazoline compound, an epoxy compound, or a carbodiimide compound may be added when heat and moisture resistance is a problem. . Further, if necessary, the physical properties may be improved by adding an antioxidant such as a phosphoric acid compound, a plasticizer, a photodegradation inhibitor, and the like.

  Polylactic acid may be used as an alloy with other polymers, but if polylactic acid is used as the main piezoelectric polymer, it contains at least 50% by weight or more based on the total weight of the alloy. It is preferably 70% by weight or more, and most preferably 90% by weight or more.

  Examples of the polymer other than polylactic acid in the case of alloy include polybutylene terephthalate, polyethylene terephthalate, polyethylene naphthalate copolymer, polymethacrylate, and the like, but the invention is not limited thereto. Any polymer may be used as long as the desired piezoelectricity is exhibited.

  As the piezoelectric fiber, a multifilament in which a plurality of filaments are bundled or a monofilament composed of a single filament may be used. The use as a multifilament is preferable from the viewpoint of long stability of electrical characteristics. When used as a monofilament, the yarn diameter is 1 μm to 5000 μm, preferably 50 μm to 1000 μm. When used as a multifilament, the single yarn diameter is 0.1 μm to 5000 μm, preferably 2 μm to 100 μm. More preferably, it is 3 micrometers-50 micrometers. The number of filaments of the multifilament is preferably 1 to 100,000, more preferably 5 to 500, and still more preferably 10 to 100.

  In order to make the above-mentioned piezoelectric polymer into a piezoelectric fiber, any known method for fiberizing the polymer can be adopted as long as the effect of the present invention is achieved, and the piezoelectric polymer is extruded. Molding and fiberizing technique, Piezoelectric polymer melt spinning and fiberizing technique, Piezoelectric polymer fiberizing process by dry or wet spinning, Piezoelectric polymer fiberizing process by electrostatic spinning Etc. can be adopted. As these spinning conditions, a known method may be applied according to the piezoelectric polymer to be employed, and a melt spinning method that is industrially easy to produce is usually employed.

  As described above, when the piezoelectric polymer is polylactic acid, the fiber is preferably stretched because it is uniaxially stretched and exhibits greater piezoelectricity when it contains crystals.

(Almost on the same plane)
In the piezoelectric element of the present invention, the conductive fiber and the piezoelectric fiber are arranged on substantially the same plane. Here, “substantially on the same plane” means that the fiber axes of the fibers are arranged on a substantially plane, and “substantially” means that a thickness is generated at the intersection of the fibers. is there.

  For example, a form in which one piezoelectric fiber is further arranged in parallel between two parallel conductive fibers is a form on substantially the same plane. Further, even if the fiber axis of the one piezoelectric fiber is tilted in a state that is not parallel to the two parallel conductive fibers, they are substantially on the same plane. Furthermore, it is assumed that one conductive fiber and one piezoelectric fiber are aligned in parallel, and the other conductive fiber is crossed with the aligned conductive fiber and piezoelectric fiber. Are also on the same plane.

  By being arranged on a substantially flat surface, it is easy to form a cloth-like piezoelectric element by combining the piezoelectric units, and using a cloth-like piezoelectric element increases the degree of freedom in designing the shape of the transducer. Can do. Examples of the type of fabric include woven fabric, knitted fabric, and non-woven fabric.

  The relationship between the piezoelectric fiber and the conductive fiber is appropriately selected depending on the shape change to be detected.

(Arrangement order)
The arrangement of the fibers in the piezoelectric unit is not particularly limited as long as the conductive fibers and the piezoelectric fibers are arranged to provide an electrical connection. For example, when the piezoelectric unit is a piezoelectric unit including two conductive fibers and one piezoelectric fiber, the conductive fiber, the piezoelectric fiber, and the conductive fiber may be arranged in this order. preferable. By arranging in this way, the two conductive fibers of the piezoelectric unit do not come into contact with each other, and the piezoelectric material can be obtained without applying other means such as a technique such as coating an insulating material. It can function effectively as a unit.

  At this time, it is desirable that the conductive fiber and the piezoelectric fiber have a contact point that physically contacts each other. However, if the distance between the conductive fiber and the piezoelectric fiber is within 4 mm, An electrical connection can be provided without contact. The distance between the conductive fiber and the piezoelectric fiber is more preferably 3 mm or less, further preferably 2 mm or less, further preferably 1 mm or less, and most preferably 0.5 mm or less. If this distance exceeds 4 mm, the electrical output accompanying the shape change of the piezoelectric fiber becomes small, making it difficult to use as a transducer.

  As a form, for example, two conductive fibers are arranged in parallel, and one piezoelectric fiber is further arranged in parallel between the two conductive fibers, or two conductive fibers. Are arranged in parallel, and one piezoelectric fiber may be arranged so as to cross these two conductive fibers. Further, two conductive fibers may be arranged as warps (or wefts), and one piezoelectric fiber may be arranged as wefts (or warps). In this case, it is preferable that the two conductive fibers are not in contact with each other, and preferably, an insulating substance, for example, an insulating fiber is interposed between the two conductive fibers. It is also possible to adopt a form in which an insulating material is coated only on the surface that is easily contacted so that the conductive fiber is in direct contact with the piezoelectric fiber.

(Fiber not in contact with conductive fiber used as piezoelectric unit)
In the present invention, there is a fiber that does not contact the conductive fiber used as the piezoelectric unit. Any fiber can be used as this fiber, but at least 50%, preferably 70%, and more preferably 90% of the total number of the fibers needs to be piezoelectric fibers. Thus, by increasing the ratio of the piezoelectric fibers, not only piezoelectric performance but also antibacterial properties can be imparted, and the antibacterial properties can be increased. In some cases, a part of the conductive fiber is not used as a piezoelectric unit, but it is not treated as a “conductive fiber used as a piezoelectric unit” here.

(Insulating fiber)
The piezoelectric unit of the present invention includes an insulating fiber, and the insulating fiber includes a conductive fiber and a piezoelectric fiber so that the conductive fiber in the piezoelectric unit is not in contact with other conductive fibers and the piezoelectric fiber. May be placed between. In this case, the insulating fiber may be a stretchable material or a fiber having a shape for the purpose of improving the flexibility of the fabric. In addition, the conductive fiber in the piezoelectric unit may be arranged not to contact the conductive fiber and the piezoelectric fiber in the other piezoelectric unit.

  By disposing the insulating fibers in the piezoelectric units in this way, even when a plurality of piezoelectric units are combined, the conductive fibers do not come into contact, and the performance as a transducer can be improved.

As such an insulating fiber, it can be used if the volume resistivity is 10 ⁶ Ω · cm or more, more preferably 10 ⁸ Ω · cm or more, and further preferably 10 ¹⁰ Ω · cm or more.

  Insulating fiber such as polyester fiber, nylon fiber, acrylic fiber, polyethylene fiber, polypropylene fiber, vinyl chloride fiber, aramid fiber, polysulfone fiber, polyether fiber, polyurethane fiber, cotton, hemp, silk, etc. Natural fibers, semi-synthetic fibers such as acetate, and regenerated fibers such as rayon and cupra can be used. It is not limited to these, A well-known insulating fiber can be used arbitrarily. Furthermore, these insulating fibers may be used in combination, or may be combined with a fiber having no insulating property to form a fiber having insulating properties as a whole.

  The insulating fiber may be a multifilament in which a plurality of filaments are bundled, or may be a monofilament composed of a single filament. The use as a multifilament is preferable from the viewpoint of long stability of the insulating characteristics. When used as a monofilament, the yarn diameter is 1 μm to 5000 μm, preferably 50 μm to 1000 μm. When used as a multifilament, the single yarn diameter is 0.1 μm to 5000 μm, preferably 2 μm to 100 μm. More preferably, it is 3 micrometers-50 micrometers. The number of filaments of the multifilament is preferably 1 to 100,000, more preferably 5 to 500, and still more preferably 10 to 100.

  In addition, for the purpose of imparting flexibility to the fabric, any known shape of fiber can be used.

(Piezoelectric unit combination form)
In the present invention, a woven or knitted fabric containing a plurality of parallel piezoelectric units is preferable. With such a configuration, it is possible to improve the degree of deformation (flexibility) of the shape as a piezoelectric element.

  Such a woven or knitted fabric shape includes a plurality of piezoelectric units, and there is no limitation as long as it functions as a piezoelectric element. In order to obtain a woven or knitted shape, knitting and weaving may be performed with a normal loom or knitting machine. In the case of introducing a plurality of piezoelectric units into one piece of fabric, it may be produced continuously during weaving or knitting, or may be produced by joining a plurality of separately produced fabrics.

  Examples of the woven structure of the woven fabric include a three-layer structure such as plain weave, twill weave, and satin weave, a change structure, a single double structure such as a vertical double weave and a horizontal double weave, and a vertical velvet.

  The type of knitted fabric may be a circular knitted fabric (weft knitted fabric) or a warp knitted fabric. Preferable examples of the structure of the circular knitted fabric (weft knitted fabric) include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, floating knitting, single-sided knitting, lace knitting, and bristle knitting. Examples of the warp knitting structure include single denby knitting, single atlas knitting, double cord knitting, half tricot knitting, back hair knitting, jacquard knitting, and the like. The number of layers may be a single layer or a multilayer of two or more layers. Further, it may be a napped woven fabric or a napped knitted fabric composed of a napped portion made of a cut pile and / or a loop pile and a ground tissue portion.

  When the piezoelectric unit is incorporated in a woven or knitted structure, the piezoelectric fiber itself has a bent portion. However, in order to efficiently exhibit the piezoelectric performance as a piezoelectric element, the bending of the piezoelectric fiber is necessary. Smaller portions are preferred. Therefore, the woven fabric is preferred for the woven fabric and the knitted fabric.

  Even in this case, as described above, the piezoelectric fiber is more efficiently expressed when the bending portion of the piezoelectric fiber is smaller. Therefore, the twill weave is preferable to the plain weave as the weave structure, and the satin weave (salmon weave) than the twill weave. Is preferred. In particular, among satin woven (red satin weave), when the number of jumps is in the range of 3 to 7, it is preferable because the retention of the woven structure and the piezoelectric performance are exhibited at a high level.

  The woven structure is appropriately selected depending on the shape change to be detected. For example, when it is desired to detect bending, it is preferable that the plain weave structure and the piezoelectric fiber and the conductive fiber have a parallel relationship. When torsion detection is desired, the satin weave structure, the piezoelectric fiber and the conductive fiber are A direct relationship is preferred.

In addition, since polylactic acid, which is a piezoelectric fiber, is easily charged, it may easily malfunction. In such a case, the piezoelectric fiber from which a signal is to be taken out can be grounded (grounded). As a method of grounding (grounding), it is preferable to dispose conductive fibers separately from the conductive fibers from which signals are extracted. In this case, the volume resistivity of the conductive fiber is preferably 10 ⁻¹ Ω · cm or less, more preferably 10 ⁻² Ω · cm or less, and still more preferably 10 ⁻³ Ω · cm or less.

(Multiple piezoelectric elements)
It is also possible to use a plurality of piezoelectric elements side by side. The arrangement may be one-dimensionally arranged in one step, two-dimensionally stacked, and may be knitted into a cloth or used as a braid. Thereby, a cloth-like or string-like piezoelectric element can be realized. In forming a cloth or string, as long as the object of the present invention is achieved, the fibers may be combined with other fibers other than the piezoelectric element and mixed, woven, knitted, etc., or incorporated into a resin or the like. You may use it.

(Applied technology for piezoelectric elements)
Regardless of the mode of the transducer of the present invention, contact with the surface, pressure, and shape change can be output as an electrical signal. FIG. 5 is a block diagram showing a first specific example of a device using the transducer of the present invention. For example, the transducer 11 of the present invention, an amplifying unit 12 for amplifying an electric signal output from the transducer 11 in accordance with an applied pressure, and an output unit 13 for outputting the electric signal amplified by the amplifying unit 12 If the device 101 including the transmission unit 14 for transmitting the electrical signal output from the output unit 13 to an external device (not shown) is configured, the device 101 is output by contact with the surface of the transducer 11, pressure, or shape change. Since the electrical signal can be easily taken out, it can be applied to various applications. Whether the transmission method by the transmission means 14 is wireless or wired may be appropriately determined according to the device to be applied.

  Further, not only the amplification means but also known signal processing means such as noise removing means and means for processing in combination with other signals can be used in combination. The order of connection of these means can be appropriately changed according to the purpose. Of course, the electrical signal output from the transducer 11 may be signal-processed after being transmitted to the external device as it is.

  Specific examples include touchscreens, human and animal surface pressure sensors, joint and bends, torsion, and expansion / contraction in the form of clothing, supporters, handkerchiefs, including hats, gloves, and socks. Sensor. For example, when used for humans, it can be used as an interface for detecting contact and movement, collecting information on movement of joints and the like for medical purposes, amusement purposes, and moving lost tissues and robots. In addition, it can be used as a stuffed animal that imitates animals and humanoids, a surface pressure sensor of a robot, a sensor that detects bending, twisting, and expansion / contraction of a joint. In addition, it can be used as a surface pressure sensor or shape change sensor for bedding such as sheets, pillows and beds, shoe soles, gloves, chairs, rugs, bags and flags.

  In particular, it is very useful to incorporate a device including the transducer of the present invention into a bed sheet such as a sheet, a pillow, a pillow cover, a bed, a futon, and a futon cover. For example, in nursing homes, the presence or absence of a patient on a bed is sensed to prevent the patient from wrinkling, and this is done with a sheet or pillow using the transducer of the present invention. Is very useful. In addition, due to the recent increase in health consciousness, products that monitor daily sleep status by sensing body movements during sleep have been released, but the sheets, pillows, and beds of the present invention are also applicable to this application. it can. However, the bedding including the device including the transducer of the present invention includes a configuration in which the device is a bedding.

  The excellent antibacterial property of the transducer of the present invention is also very suitable for incorporation into bedding such as sheets, pillows / pillow covers, beds, duvets / futon covers. Bedding comes in contact with the human body, so-called bad bacteria such as Staphylococcus aureus adhere to it, and it grows on the fabric using sweat components and dirt as nutrients. Cause a bad odor. Staphylococcus aureus is also suspected as a cause of inflammation such as atopic dermatitis. Since the transducer of the present invention is excellent in antibacterial properties, it is possible to suppress the growth of bacteria such as Staphylococcus aureus and thereby suppress the generation of malodor.

  The transducer fabric of the present invention also has excellent washing durability. In addition, the transducer of the present invention is not a surface treatment such as applying antibacterial processing to the fabric, but the transducer itself has high antibacterial properties, so that the antibacterial properties do not decrease even after repeated washing. .

  Furthermore, since the sensor of the present invention is in the form of a cloth, it has stretchability and flexibility, so that it can be used as a surface pressure sensor or a shape change sensor by pasting or covering all or part of the surface of any structure. be able to.

  In addition, since the transducer of the present invention can take out an electrical signal as an output, it can also be used as a power generation element such as a power source for storing other devices or storing electricity. FIG. 6 is a block diagram showing a second specific example of a device using the transducer of the present invention. For example, the transducer 11 of the present invention, an amplifying unit 12 for amplifying an electric signal output from the transducer 11 in accordance with an applied pressure, and an output unit 13 for outputting the electric signal amplified by the amplifying unit 12 If the device 102 consisting of the above is configured, the electrical signal output by the contact with the surface of the transducer 11, the pressure, and the shape change is used as a power source for moving other devices, or is stored in the power storage device. Can do. If such a device is incorporated into a bedding such as a sheet or a pillow, it can be used as a power source for moving other devices incorporated in the bedding such as a sheet or a pillow, or can be incorporated into a bedding such as a sheet or a pillow. Can be stored in the stored power storage device.

  Further, not only the amplification means but also known signal processing means such as noise removing means and means for processing in combination with other signals can be used in combination. The order of connection of these means can be appropriately changed according to the purpose. Of course, the electrical signal output from the transducer 11 may be signal-processed after being transmitted to the external device as it is.

  Hereinafter, the present invention will be described more specifically by way of examples. However, the present invention is not limited to these examples.

Each physical property was measured by the following methods.
(1) Optical purity of polylactic acid:
Collect 0.1 g of polylactic acid fiber (one bundle in the case of multifilament) constituting the fabric, add 1.0 mL of 5 mol / liter sodium hydroxide aqueous solution / 1.0 mL of methanol, and bring to 65 ° C. Set in a set water bath shaker, hydrolyze for about 30 minutes until the polylactic acid becomes a homogeneous solution, and further add 0.25 mol / liter sulfuric acid to the hydrolyzed solution to neutralize it. 0.1 mL of the decomposition solution was collected, diluted with 3 mL of high-performance liquid chromatography (HPLC) mobile phase solution, and filtered through a membrane filter (0.45 μm). This adjustment solution was subjected to HPLC measurement, and the ratio of L-lactic acid monomer to D-lactic acid monomer was quantified. When the amount of one polylactic acid fiber is less than 0.1 g, the amount of other solution used is adjusted according to the amount that can be collected, and the concentration of polylactic acid in the sample solution used for HPLC measurement is 100 minutes from the above. It was made to be in the range of 1.
<HPLC measurement conditions>
Column: “Sumichiral (registered trademark)” OA-5000 (4.6 mmφ × 150 mm) manufactured by Sumika Chemical Analysis Co., Ltd.
Mobile phase: 1.0 mmol / liter copper sulfate aqueous solution Mobile phase flow rate: 1.0 ml / min Detector: UV detector (wavelength 254 nm)
Injection amount: 100 microliters When the peak area derived from the L-lactic acid monomer is S _LLA and the peak area derived from the D-lactic acid monomer is S _DLA , S _LLA and S _DLA are the molar concentrations M _LLA and L-lactic acid monomer. Since it was proportional to the molar concentration M _DLA of the D-lactic acid monomer, the larger value of S _LLA and S _DLA was taken as S _MLA , and the optical purity was calculated by the following formula (1).
[Equation 1]
Optical purity (%) = S _MLA / (S _LLA + S _DLA ) × 100 (1)

(2) Antibacterial evaluation The antibacterial evaluation was conducted using a staphylococcus aureus test according to the JIS L1902 bacterial solution absorption method. The bacteriostatic activity value obtained here is calculated by the following calculation method. If the bacteriostatic activity value is> 2.2, it is considered to have an antibacterial effect.
Bacteriostatic activity value S = Mb-Mc
Mb: Common logarithm of the number of viable bacteria 18 hours after the reference cloth (cotton) Mc: Common logarithm of the number of viable bacteria 18 hours after the test cloth

(3) Washing durability test The washing durability test was performed 50 times of washing (L50) according to the dyeing fastness test method A-1 method for washing. Piezoelectricity measurements before and after the washing durability test were performed on the fabrics produced in Examples 1 and 2 and Comparative Examples described later.

The fabric for the transducer was manufactured by the following method.
(Manufacture of polylactic acid)
The polylactic acid used in the examples was produced by the following method.
To 100 parts by weight of L-lactide (manufactured by Musashino Chemical Laboratory, Inc., optical purity 100%), 0.005 part by weight of octylate is added, and 180 ° C. in a reactor equipped with a stirring blade in a nitrogen atmosphere. Then, 1.2 times equivalent of phosphoric acid was added to tin octylate, and then the remaining lactide was removed under reduced pressure at 13.3 Pa to obtain chips to obtain poly-L-lactic acid (PLLA1). . The resulting PLLA1 had a weight average molecular weight of 152,000, a glass transition point (Tg) of 55 ° C., and a melting point of 175 ° C.

(Piezoelectric fiber)
PLLA1 melted at 240 ° C. was discharged from a 24-hole cap at 20 g / min and taken up at 887 m / min. This unstretched multifilament yarn was stretched 2.3 times at 80 ° C. and heat-set at 100 ° C. to obtain a 84 dTex / 24 filament multifilament uniaxially stretched yarn, which was designated as piezoelectric fiber A.

(Conductive fiber)
The silver-plated nylon product name “AGposs” made by Mitsuji Fuji Textile Industry was used. The volume resistivity of this fiber was 1.1 × 10 ⁻³ Ω · cm. This fiber was designated as conductive fiber B.

(Insulating fiber)
Polyethylene terephthalate melted at 280 ° C. was discharged from a 24-hole cap at 45 g / min and taken up at 800 m / min. This undrawn yarn was drawn at 80 ° C. and 2.5 times, and heat-fixed at 180 ° C. to obtain a multifilament drawn yarn of 84 dTex / 24 filament.

Example 1
As shown in FIG. 1, a plain woven fabric was produced in which insulating fibers C were arranged on the warp and piezoelectric fibers A and conductive fibers B were alternately arranged on the weft. At this time, the piezoelectric fibers A were all used as the fibers R not in contact with the piezoelectric unit P. That is, 100% of the total number of fibers not in contact with the conductive fiber B used as the piezoelectric unit P was the piezoelectric fiber A. And as shown in FIG. 4, the sheet 110 was produced using this plain fabric.

  A pair of conductive fibers B sandwiching the piezoelectric fiber A in the sheet 110 is used as signal lines to the oscilloscope 1 (digital oscilloscope DL6000 series product name “DL6000” manufactured by Yokogawa Electric Corporation) via the evaluation wirings 2 and 3. Connected. In this state, when the sheet 110 was bent in a direction perpendicular to the piezoelectric fiber A, a potential difference of 3 mV was detected from the oscilloscope 1. Moreover, the bacteriostatic activity value of this plain fabric was 3.8. Further, the ratio of the potential difference of the potential difference after the selective durability test to the potential difference before the washing durability test of the sheet 110, that is, the maintenance ratio of the potential difference was 97%.

(Example 2)
As shown in FIG. 2, a plain woven fabric was produced in which insulating fibers C were arranged on the warp and piezoelectric fibers A and conductive fibers B were alternately arranged on the weft. At this time, 57% of the fibers R not in contact with the piezoelectric unit P used the piezoelectric fibers A. That is, 57% of the total number of fibers not in contact with the conductive fiber B used as the piezoelectric unit P was the piezoelectric fiber A. And as shown in FIG. 4, the sheet 110 was produced using this plain fabric.

  A pair of conductive fibers B sandwiching the piezoelectric fiber A in the sheet 110 were connected as signal lines to the oscilloscope 1 (same as above) via evaluation wires 2 and 3. In this state, when the sheet 110 was bent in a direction perpendicular to the piezoelectric fiber A, a potential difference of 3 mV was detected from the oscilloscope 1. Moreover, the bacteriostatic activity value of this plain fabric was 2.3. Further, the maintenance ratio of the potential difference before and after the washing durability test of the sheet 110 was 97%.

(Comparative example)
As shown in FIG. 3, a plain woven fabric was produced in which insulating fibers C were arranged on the warps and piezoelectric fibers A and conductive fibers B were arranged alternately on the wefts. At this time, 43% of the fibers R not in contact with the piezoelectric unit P used the piezoelectric fibers A. That is, 43% of the total number of fibers not in contact with the conductive fiber B used as the piezoelectric unit P was the piezoelectric fiber A. And as shown in FIG. 4, the sheet 110 was produced using this plain fabric.

  A pair of conductive fibers B sandwiching the piezoelectric fiber A in the sheet 110 were connected as signal lines to the oscilloscope 1 (same as above) via evaluation wires 2 and 3. In this state, when the sheet 110 was bent in a direction perpendicular to the piezoelectric fiber A, a potential difference of 3 mV was detected from the oscilloscope 1. Moreover, the bacteriostatic activity value of this plain fabric was 1.3. Further, the maintenance ratio of the potential difference before and after the washing durability test of the sheets was 96%.

A Piezoelectric fiber B Conductive fiber C Insulating fiber 1 Oscilloscope 2 Evaluation wiring 3 Evaluation wiring 11 Transducer 12 Amplifying means 13 Output means 14 Transmitting means 101, 102 Device 110 Sheet

Claims (14)

  A transducer comprising a piezoelectric unit in which conductive fibers and piezoelectric fibers are arranged in substantially the same plane so as to provide an electrical connection, wherein the conductive fibers in the piezoelectric unit are in other piezoelectric units. Bedding using a transducer which is arranged so as not to be electrically connected to the conductive fibers and / or piezoelectric fibers of the transducer and has an antibacterial activity value of 2.2 or more.   The bedding according to claim 1, wherein 50% or more of the number of fibers constituting the transducer that are not in contact with the conductive fibers used as the piezoelectric unit are made of piezoelectric fibers.   The bedding according to claim 1, wherein in the piezoelectric unit, the conductive fiber and the piezoelectric fiber have contacts that physically contact each other.   The bedding according to claim 1, wherein insulating fibers are arranged so that the conductive fibers in the piezoelectric unit are not electrically connected to conductive fibers and / or piezoelectric fibers in other piezoelectric units. .   The bedding according to claim 1, wherein the piezoelectric fibers mainly contain polylactic acid.   The bedding according to claim 1, wherein the piezoelectric fiber mainly contains poly-L-lactic acid or poly-D-lactic acid having an optical purity of 99% or more.   The bedding according to claim 1, wherein the piezoelectric fibers are uniaxially oriented and include crystals.   The bedding according to claim 1, wherein the conductive fiber is a metal-plated fiber.   The bedding according to claim 1, wherein the transducer is a woven or knitted fabric containing a plurality of the piezoelectric units.   The bedding according to claim 9, wherein the transducer is a woven fabric containing a plurality of the piezoelectric units, and the woven structure is any of a plain weave, a twill weave, a satin weave, and a composite structure thereof.   The bedding according to claim 10, wherein the transducer is a combination of a plurality of the woven and knitted fabrics. The transducer;
Amplifying means for amplifying an electrical signal output from the transducer in response to an applied pressure;
Output means for outputting the electrical signal amplified by the amplification means;
The bedding according to any one of claims 1 to 11, comprising a device comprising:   The bedding according to claim 12, wherein the device further includes transmission means for transmitting an electrical signal output from the output means to an external device. The transducer;
Transmitting means for transmitting an electrical signal output from the transducer in response to an applied stress to an external device;
The bedding according to any one of claims 1 to 11, comprising a device comprising: