WO2015166888A1 - タッチセンサおよびブレスレット型デバイス - Google Patents
タッチセンサおよびブレスレット型デバイス Download PDFInfo
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- WO2015166888A1 WO2015166888A1 PCT/JP2015/062535 JP2015062535W WO2015166888A1 WO 2015166888 A1 WO2015166888 A1 WO 2015166888A1 JP 2015062535 W JP2015062535 W JP 2015062535W WO 2015166888 A1 WO2015166888 A1 WO 2015166888A1
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- WIPO (PCT)
- Prior art keywords
- touch sensor
- sensor
- protective layer
- surface protective
- sensor electrode
- Prior art date
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/163—Wearable computers, e.g. on a belt
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1656—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
Definitions
- the present invention relates to a touch sensor, and more particularly to a wearable touch sensor that can be used while being worn on a part of the body, and a bracelet type device using the wearable touch sensor.
- Patent Document 1 describes a wristwatch-type wearable device. In such high-function devices, input buttons and touch sensors made of metal members are used.
- a high-function device worn and used touches the body on the back side opposite to the operation surface that operates the touch panel. Therefore, the touch sensor built into this high-function device changes the capacitance from the back side. Also sense. In particular, if the high-functional device is thin, malfunction may occur due to capacitance change due to contact or non-contact with the body on the back side. For this reason, in a high-function device that directly touches the skin, places where sensors can be arranged are limited.
- the present invention has been made to overcome these problems, and is a touch sensor that is difficult to detect a change in capacitance from the back surface side, and particularly a touch sensor that is unlikely to malfunction even when worn and used. It aims at providing the bracelet type device using this.
- a touch sensor that includes a sensor electrode layer having a plurality of sensor electrodes and includes a surface protective layer located on the operation surface side and a back surface protection layer located on the opposite side of the operation surface is opposite to the operation surface.
- a back surface protective layer is provided with a deterring member that makes it difficult to detect a change in capacitance from the side.
- the sensor electrode Since a deterrent member that makes it difficult to detect capacitance change is provided on the back side of the sensor electrode layer, even if the operator touches the back side of the touch sensor, the sensor electrode is difficult to detect change in capacitance. can do. Therefore, even if it is a bracelet-type wearable sensor, for example, when the back side of the arm is in contact with or away from the arm, it is difficult to detect a change in capacitance due to the presence or absence of arm contact. Can be made difficult. As described above, the use of the touch sensor of the present invention makes it difficult for malfunctions to occur in applications where the capacitance change is likely to occur not only on one side but also on the other side.
- the sensor electrode layer may be a touch sensor formed of a sensor sheet including a base film, a plurality of sensor electrodes formed on one surface of the base film, and a resist covering the sensor electrode. Since the sensor electrode layer is composed of a sensor sheet including a base film, a plurality of sensor electrodes formed on one surface of the base film, and a resist covering the sensor electrode, the sensor electrode layer is manufactured using a commercially available sensor sheet. Is easy, and the manufacturing process can be shortened. In addition, it is possible to easily connect to a control unit that processes sensor signals by using a terminal in which wires connected to a plurality of sensor electrodes are bundled. Further, since the sensor electrode is protected by the base film and the resist, a touch sensor having high resistance against external force such as bending and stretching can be obtained.
- the suppression member contains the insulation part whose wall thickness is 3 times or more of the surface protective layer. If the suppression member is provided with an insulating portion whose thickness is three times or more of the surface protective layer, the change in capacitance is inversely proportional to the thickness, so if the surface protective layer and the back surface protective layer are made of the same material, The change in the capacitance of the back surface with respect to the front surface can be reduced to 1/3 or less. Therefore, if there is such a difference, it is possible to distinguish the signals from the front surface and the back surface, so that the signal from the back surface can be determined as noise and the malfunction can be suppressed.
- the restraining member can be a touch sensor including an insulating portion having a dielectric constant lower than that of the surface protective layer. Since the suppressing member includes an insulating portion having a lower dielectric constant than that of the front surface protective layer, it is difficult to effectively detect a change in capacitance even if the thickness of the back surface protective layer is reduced. Therefore, it is suitable when applied to a thin device.
- the restraining member may include a conductive part positioned so as to at least partially overlap the sensor electrode in a direction perpendicular to the operation surface, and the conductive part may be a touch sensor that is insulated from the sensor electrode.
- the restraining member includes a conductive portion positioned so as to at least partially overlap the sensor electrode in a direction perpendicular to the operation surface, and since the conductive portion is in an insulating state with respect to the sensor electrode, The electrostatic action with the sensor electrode can be blocked, and malfunction can be suppressed.
- the conductive part is preferably connected to ground. By connecting the conductive part to the ground, the potential of the conductive part can be kept constant, and it is difficult for the potential change to occur, making it difficult to detect the capacitance change on the back surface protective layer side.
- Such a touch sensor can be used as a wearable touch sensor in which a part of the operator's body is in contact with the side opposite to the operation surface, and also includes a wearable touch sensor and a bracelet-type device including a control unit that processes sensor signals. It can be.
- the touch sensor of the present invention malfunctions are unlikely to occur even when used as a wearable touch sensor or a bracelet type device that is worn.
- FIG. 2 is a cross-sectional view of the bracelet type device of FIG. 1 in a state where the bracelet type device is cut so as to open in a strip shape on one sensor electrode. It is sectional drawing of the state cut
- FIG. 1 is a plan view of a sample 1.
- FIG. 1 shows a perspective view of a bracelet type device 10 of the present embodiment.
- the external appearance of the device 10 has a shape that can be attached to and detached from the arm by opening and closing the coupling portion 3 by having an annular belt 2 on the display portion 1 on which various indications are made.
- the touch sensor applied as the wearable touch sensor 11 and the control unit 12 the display unit 1 becomes a display unit 1) that is connected to the sensor electrode 14 of the wearable touch sensor 11 to conduct the sensor signal. Part), the band part 13 and the coupling part 3 which are other parts.
- the wearable touch sensor 11 forms one part of the belt 2 in this embodiment, and has one end coupled to the control unit 12 and the other end coupled to the coupling unit 3.
- the front surface 2a of the device 10 is an operation surface for input operation, and the opposite side is the back surface 2b.
- FIG. 2 shows a cross-sectional view of a state in which the annular device 10 is cut so as to open in a strip shape on one sensor electrode 14.
- the wearable touch sensor 11 is configured by laminating a surface protective layer 15, a sensor electrode layer 16, and a back surface protective layer 17 in this order from the surface 2 a side of the device 10.
- the sensor electrode layer 16 is composed of a sensor sheet 11a having a plurality of sensor electrodes 14 in this embodiment.
- the sensor sheet 11a is a sheet-like material having a laminated structure in which a plurality of conductive sensor electrodes 14 and wiring (not shown) are provided on the base film 11b and covered with a resist 11c. By using the sensor sheet 11a, it is easy to form an end portion and wiring connected to the control unit 12.
- the base film 11b is preferably made of a thermoplastic resin film. This is because a thermoplastic resin can be easily molded by heating. Examples of the material include polyethylene terephthalate (PET) resin, polyethylene naphthalate (PEN) resin, polycarbonate (PC) resin, polymethyl methacrylate (PMMA) resin, polypropylene (PP) resin, polyurethane (PU) resin, polyamide (PA ) Resin, polyethersulfone (PES) resin, polyetheretherketone (PEEK) resin, triacetylcellulose (TAC) resin, polyimide (PI) resin, cycloolefin polymer (COP), and the like.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PC polycarbonate
- PMMA polymethyl methacrylate
- PU polypropylene
- PA polyamide
- PA polyethersulfone
- PEEK polyetheretherketone
- TAC triacetylcellulose
- PI poly
- the thickness of the base film 11b is not particularly limited, but is preferably 10 ⁇ m to 200 ⁇ m.
- the base film 11b may be subjected to a surface treatment by providing a primer layer that enhances adhesion to the conductive polymer, a surface protective layer, an overcoat layer for the purpose of preventing static charge, or the like.
- the sensor electrode 14 includes a conductive ink or a conductive polymer. If a conductive polymer is used, it is difficult to lose conductivity with respect to expansion and contraction, and a highly transparent sensor electrode 14 can be obtained. Further, it is preferable in that a liquid coating liquid can be formed and printed, and the sensor electrode 14 can be obtained at a lower cost than ITO or the like. On the other hand, when transparency is not necessary, the sensor electrode 14 can be formed of conductive ink such as silver ink or carbon paste. Silver ink is preferable in that it can form a sensor electrode 14 having low resistance and excellent sensitivity. On the other hand, the carbon paste is preferable in that the sensor electrode 14 can be obtained at a lower cost than the conductive polymer and the weather resistance is excellent.
- the layer thickness of the sensor electrode 14 is preferably 0.04 ⁇ m to 1.0 ⁇ m, and more preferably 0.06 ⁇ m to 0.4 ⁇ m. If the layer thickness is less than 0.04 ⁇ m, the resistance value of the sensor electrode 14 may increase, and if the layer thickness exceeds 1.0 ⁇ m, the transparency may decrease.
- the layer thickness of the sensor electrode 14 can be measured using an atomic force microscope (AFM) after forming the sensor electrode 14 on the base film 11b.
- AFM atomic force microscope
- the wiring is a conductive wire that electrically connects the control unit 12 and the sensor electrode 14 and is formed from a conductive paste or conductive ink containing a highly conductive metal such as copper, aluminum, silver, or an alloy containing those metals. It is preferable. Further, among these metals and alloys, silver wiring is preferable because it has high conductivity and is less likely to be oxidized than copper.
- the thickness of the wiring is preferably 1.0 ⁇ m to 20 ⁇ m. If it is less than 1.0 ⁇ m, the resistance value of the wiring tends to increase, which may cause noise. On the other hand, if the thickness exceeds 20 ⁇ m, the level difference becomes large, so that there is a high risk that bubbles will enter when the resist 11c is applied.
- the resist 11c is an insulating coating provided to prevent conduction between the plurality of sensor electrodes 14 and to protect the sensor electrodes 14 from ultraviolet rays, scratches, and the like. Moreover, it is suitable also as a use which prevents the sulfidation of the wiring which consists of silver paste or a metal.
- a hard resin is selected as the resin used as the resist 11c. For example, acrylic resin, urethane resin, epoxy resin, polyolefin resin, and other resins can be used. If transparency is required, the resin is transparent. A compatible resin is used.
- the thickness of the resist 11c is usually 6 ⁇ m to 30 ⁇ m, preferably 10 ⁇ m to 20 ⁇ m. This is because if it exceeds 30 ⁇ m, the flexibility is poor, and if it is less than 6 ⁇ m, the sensor electrode 14 may not be sufficiently protected.
- the surface protective layer 15 is located on the operation surface side with respect to the sensor electrode layer 16 that is the sensor sheet 11a and protects the sensor electrode layer 16.
- a hard resin or an elastomer can be used as a material used for the surface protective layer 15.
- a flexible elastomer in consideration of the wearability and touch of the device 10.
- the flexible elastomer include a thermosetting rubber and a thermoplastic elastomer.
- the surface protective layer 15 is preferably made of a material having a high dielectric constant.
- the dielectric material of the surface protective layer 15 can be obtained by using a fluorine resin such as polyurethane resin having a relatively high dielectric constant or polyvinylidene fluoride, or by adding a filler that increases the dielectric constant such as barium titanate or titanium oxide. The rate can be increased.
- the thickness of the surface protective layer 15 is preferably thin as long as a desired protective effect for protecting the sensor electrode layer 16 is obtained. This is because the thinner the sensor sensitivity can be increased. Further, it is more preferably thinner than the back surface protective layer 17. This is because it is possible to increase the capacitance change when the operator touches the operation surface and to prevent malfunction.
- a decorative layer for applying a pattern, a design, or the like to the front surface or the back surface of the surface protective layer 15 can be provided.
- the decorative layer is provided on the back surface of the surface protective layer 15, the surface protective layer 15 needs to be formed of a transparent resin.
- the back surface protective layer 17 of the present embodiment is configured as an insulating portion having a lower dielectric constant than that of the front surface protective layer 15, and itself serves as a suppression member 17a.
- the restraining member 17a is a member for making it difficult to transmit the change in capacitance due to contact or non-contact with the arm on the back surface 2b to the sensor electrode 14. Examples of a method for lowering the dielectric constant of the back surface protective layer 17 serving as the suppressing member 17a include using a material having a low dielectric constant for the material itself or configuring an air layer.
- examples include a method using a silicone material, a fluorine resin such as polytetrafluoroethylene or a foam having a relatively low dielectric constant, and a method of forming an air layer by forming protrusions on the surface. be able to.
- the thickness of the back surface protective layer 17 as the restraining member 17a is set to a thickness that provides a desired protective effect. Further, it is preferably thicker than the surface protective layer 15. If the capacitance change when the operator touches the back surface protective layer 17 is smaller than the capacitance change when the operator touches the operation surface, the surface touched by the operator is set by setting a predetermined threshold. This is because it can be determined. In particular, if the difference between the dielectric constants of the surface protective layer 15 and the back surface protective layer 17 is small, it is possible to make it difficult to cause a malfunction by making a difference in thickness.
- the base film 11b of the sensor sheet 11a is disposed at a position in contact with the back surface protection layer 17, and the resist 11c of the sensor sheet 11a is disposed at a position in contact with the surface protection layer 15.
- the sensor sheet 11a is insert-molded and integrally molded with the surface protective layer 15 and the back surface protective layer 17, or the back surface protective layer 17 and the sensor sheet 11a are stacked on the surface protective layer.
- a liquid resin to be 15 can be applied, or the sensor sheet 11a can be fixed between the front surface protective layer 15 and the rear surface protective layer 17 which have been molded in advance.
- the wearable touch sensor 11 and the control unit 12 are configured as separate members, and are fixed to each other while conductively connecting a wiring extending from the sensor electrode 14 to a predetermined part of the control unit 12.
- the control unit 12 has a function of processing the output of the wearable touch sensor 11, displaying information as necessary, and inputting / outputting a signal to / from an external device. Further, the control unit 12 is provided with a display panel, which is also a display unit 1 for displaying various information.
- FIG. 3 shows a cross-sectional view of the ring-shaped device 10 cut into two parts.
- the left side is a wearable touch sensor 11 and the right side is a belt 13 formed of soft plastic, rubber material, leather, or the like.
- a control unit 12 including the display unit 1 is positioned on the upper side of the drawing, and a coupling unit 3 is formed on the lower side of the drawing.
- the wearable touch sensor 11 and the device 10 including the wearable touch sensor 11 are used by the operator unwinding the coupling portion 3 and winding the belt 2 around the arm.
- the controller 12 connected to the sensor electrode 14 detects a change in capacitance and performs necessary processing. In some cases, the result is displayed through the display unit 1.
- the device 10 wound around the arm is worn with a gap between the device and the arm 10
- the gap between the wearable touch sensor 11 and the wearable touch sensor 11 are repeatedly generated, and the capacitance change caused thereby is repeated. Is not easily transmitted to the sensor electrode 14 by the restraining member 17a, and thus malfunctions caused by this non-contact are unlikely to occur.
- the surface protective layer 15 and the back surface protective layer 17 can be made of the same material.
- the thickness of the back surface protective layer 17 is preferably at least three times that of the surface protective layer. Since the change in capacitance when the operator touches is inversely proportional to the thickness, if the thickness of the sealing member 17a is three times or more than the thickness of the surface protective layer 15, the change in capacitance also increases in thickness. This is because it can be reduced in proportion to the difference. If the change in capacitance is approximately three times or more, the signals from the operation surface and the back surface can be distinguished, so that malfunctions can be suppressed by dividing both into noise and signals.
- FIG. 4 shows a bracelet-type device 20 according to another embodiment.
- the configuration of the wearable touch sensor 21 is different, and instead of the sensor electrode layer 16 being the sensor sheet 11 a, the wearable touch sensor 21 is a single layer composed of only the sensor electrode 14.
- the wearable touch sensor 21 can be manufactured by printing the sensor electrode 14 on the back surface protective layer 17 and laminating the surface protective layer 15. Even in such an aspect, the device 20 can be configured such that malfunction does not easily occur even when the back surface 2b touches or does not touch the body.
- FIG. 5 Third Embodiment [FIG. 5] :
- FIG. 5 shows a bracelet-type device 30 according to still another embodiment.
- the wearable touch sensor 31 is different. More specifically, the entire belt 2 is a wearable touch sensor 31, and the belt 2 located on the right side of FIG. 5 is also a laminated portion of the back surface protective layer 17 and the surface protective layer 15 constituting the wearable touch sensor 31. It is configured.
- the control unit 12 is also fixed and integrated on the back surface protective layer 17. Even in such an embodiment, the device 30 is less likely to malfunction due to the back surface 2b touching or not touching the body.
- FIG. 6 shows a cross-sectional view corresponding to FIG. 2 of a bracelet type device 40 according to still another embodiment.
- This bracelet type device 40 is different from the previous embodiments in that a conductive inhibiting member 17b is provided on the back surface protective layer 17 of the wearable touch sensor 41.
- the back surface protective layer 17 has a conductive restraining member 17 b together with the insulating portion 19.
- the conductive restraining member 17b can be formed of a metal material such as copper, aluminum, or stainless steel, a conductive resin in which silver powder or copper powder is dispersed in a resin, or a conductive polymer.
- the suppressing member 17b is arranged in the outermost layer so as to be an exterior.
- the restraining member 17b is formed so as to cover at least a part of the sensor electrode 14 in the direction perpendicular to the surface 2a of the device 40, and is preferably completely covered. In the embodiment shown in FIG. 6, the entire sensor electrode 14 is covered. By covering the sensor electrode 14, it is possible to make it difficult for the sensor electrode 14 to detect a change in capacitance even when the operator touches the back surface 2 b of the device 40.
- FIG. 7 shows a cross-sectional view corresponding to FIG. 2 of a bracelet type device 50 according to still another embodiment.
- the conductive restraining member 17c is provided on the back surface protective layer 17 of the wearable touch sensor 51, but the arrangement thereof is different from that of the previous embodiment.
- the back surface protection layer 17 has a conductive restraining member 17c separately from the insulating portion 19, and the restraining member 17c is fixedly provided on the back surface of the base film 11b. Even in this case, since the sensor electrode 14 is covered with the suppressing member 17c, even if the operator touches the back surface protective layer 17, the sensor electrode 14 can be prevented from detecting a change in capacitance. .
- the restraining member 17 c needs to be insulated from the sensor electrode 14, and is embedded in the back surface protective layer 17, that is, in the insulating portion 19. Can be arranged.
- the conductive restraining member 17 c can be electrically isolated (floating) in the back surface protective layer 17 and can be connected to the ground (GND) provided in the control unit 12. By doing so, even if the operator touches the back surface 2b of the device 50, the potential of the restraining member 17c is kept constant, so that the capacitance change from the back surface 2b can be further prevented from being detected. .
- the above embodiment is an example of the present invention, and is not limited to such a form, and includes changes and replacements of the shape, material, manufacturing method, and the like of each member as long as they do not contradict the gist of the present invention.
- the back surface protective layer 17 can be formed of a low dielectric constant material and a thick film, and the suppression members 17a to 17c can be applied to different embodiments.
- the sensor electrode layer 16 formed with the sensor sheet 11a can be used as a single layer of the sensor electrode 14 and vice versa.
- the control unit 12 has the display unit 1, the control unit 12 may not include the display unit 1, and the control unit 12 is formed so that processing data in the control unit 12 can be displayed on a PC or the like. May be.
- the touch sensor has been described as an example where the wearable touch sensors 11 to 51 are applied to the bracelet type devices 10 to 50.
- the touch sensor is not limited to the devices 10 to 50, and is not limited to the glass type device or the globe type device.
- any device can be used as long as one surface is an operation surface and the other surface touches an operator.
- the surface to be touched with a finger is referred to as “front surface”
- the contact surface such as an arm is referred to as “back surface”.
- the surface can be a “front surface” and the opposite surface can be a “back surface”.
- a change in the capacitance of the back surface may be detected by the sensor electrode layer of the part.
- sample 1 shown below that imitates a wearable touch sensor was produced.
- a plan view of the sample 1 is shown in FIG. First, a sensor sheet (sensor electrode layer) (11a) in which a sensor electrode (14) and a resist (11c) were laminated on one surface of a strip-like polyethylene terephthalate film (base film (11b)) having a thickness of 100 ⁇ m was produced.
- conductive portions serving as sensor electrodes (14) having a width of 15 mm and a length of 25 mm are formed with a transparent conductive ink on the surface of a base film (11b) having a width of 20 mm and a length of 180 mm.
- a wiring (20) extending from each sensor electrode (14) to one end of the base film (11b) was formed, and a resist (11c) was formed thereon using a transparent polyurethane resin ink. At this time, the one end of the wiring was not covered with the resist (11c), and carbon ink was overlapped to form the terminal (21).
- the sensor electrode (14), wiring (20), resist (11c), and terminal (21) were all formed by screen printing.
- a surface protective layer (15) made of a silicone rubber layer with a thickness of 1 mm is provided on the surface of the sensor sheet (11a) on the resist (11c) side so that the terminal (21) is exposed, and the surface on the base film side is thick.
- a back surface protective layer (17) made of a 1 mm thick silicone rubber layer was provided. In this way, a sample 1 imitating a wearable touch sensor was produced.
- Sample 2 was prepared in the same manner as Sample 1 except that the back protective layer was a 1 mm thick silicone foam layer.
- Sample 3 was prepared in the same manner as Sample 1, except that the back surface protective layer was a 3 mm thick silicone rubber layer.
- Sample 4 was prepared in the same manner as Sample 1, except that the back surface protective layer was composed of an insulating portion made of a silicone rubber layer having a thickness of 1 mm and a deterring member made of an aluminum foil having a thickness of 12 ⁇ m provided on the outer surface thereof.
- the suppression member aluminum foil
- the back surface protective layer is composed of a suppression member made of 12 ⁇ m thick aluminum foil provided on the back surface of the sensor sheet, and an insulating portion made of a 1 mm thick silicone rubber layer so as to cover the suppression member.
- Sample 6 was produced in the same manner as Sample 1, except for the above. In sample 6, the sensor electrode and the restraining member are in an insulated state via a polyethylene terephthalate film.
- Sample 7> In Sample 6, Sample 7 was prepared in the same manner as Sample 6 except that the suppression member (aluminum foil) was connected to the ground (earth) of the measuring device.
- Sensitivity test 1 Changes in sensitivity were measured when the surface (surface protective layer side, the same applies hereinafter) was touched with a finger while each sample was placed on an insulating sample stage. This measured value is defined as S1.
- Sensitivity test 2 Each sample was mounted on the arm so that the back surface was in contact with the bare skin, and the change in sensitivity before and after the mounting was measured. This measured value is N (noise).
- Sensitivity test 3 For each sample, a change in sensitivity was measured when the surface was touched with a finger in the state of being worn on the arm of sensitivity test 2. This measured value is defined as S2.
- S / N ratio The S / N ratio was calculated with the change in sensitivity when the surface was touched with a finger as a signal (S1, S2) and the change in sensitivity when the back surface was in contact with the arm as noise (N). The above results are shown in Table 1 below.
- Sample 3 in which the thickness of the back surface protective layer was three times the thickness of the front surface protective layer had an S1 / N ratio and an S2 / N ratio of 2 or more. From this, it was found that when the same material or a material with similar dielectric properties is used, the thickness is preferably three times or more. On the other hand, the comparison between Sample 2 and Sample 1 shows that the influence of arm contact with the back surface can be reduced by using a material having a low dielectric constant such as a foam material even if the thickness is the same.
- both the S1 / N ratio and S2 / N ratio are increased by connecting the deterring member to the ground. I found it to improve.
- Sample 5 and sample 7 were particularly large in both S1 / N ratio and S2 / N ratio, and it was found that a configuration in which the restraining member is connected to the ground is preferable as a wearable touch sensor.
Abstract
Description
即ち、複数のセンサ電極を有するセンサ電極層を備え、操作面側に位置する表面保護層と操作面とは反対面側に位置する裏面保護層とが積層したタッチセンサについて、操作面とは反対側からの静電容量変化を感知し難くする抑止部材を裏面保護層に設けたタッチセンサである。
センサ電極層が、ベースフィルムと、そのベースフィルムの一方面に形成された複数のセンサ電極と、そのセンサ電極を覆うレジストとを備えるセンサシートからなるため、市販のセンサシート等を利用すれば製造が容易であり、製造工程を短くすることができる。また、複数のセンサ電極と接続する配線を束ねた端子を利用して、センサ信号を処理する制御部への接続を簡単に行うことができる。また、センサ電極がベースフィルムとレジストとで保護されているため、曲げ伸ばし等の外力に対して耐性が強いタッチセンサとすることができる。
抑止部材に、肉厚が表面保護層の3倍以上の絶縁部を設ければ、静電容量の変化は厚みに反比例することから、表面保護層と裏面保護層とを同材料とすれば、表面に対して裏面の静電容量の変化を1/3以下とすることができる。したがって、この程度の差があれば表面と裏面の信号を区別できるため裏面からの信号をノイズと判別して誤動作を抑止することができる。
抑止部材に、表面保護層に比べて誘電率が低い絶縁部を含むため、裏面保護層の厚みを薄くしても効果的に静電容量の変化を検出し難くすることができる。よって、薄型の機器に適用する場合に好適である。
抑止部材に、操作面に対する垂直方向においてセンサ電極に少なくとも一部が重なるように位置した導電部を含み、かつこの導電部はセンサ電極に対して絶縁状態にあるため、裏面保護層の外表面とセンサ電極との間の静電作用を遮ることができ、誤動作を抑制することができる。
第1実施形態[図1~図3]:
表面保護層15と裏面保護層17との間に加飾層(図示せず)を設けるような場合は、センサシート11aに透明性が要求されるため、ベースフィルム11bも透明性のある樹脂フィルムを用いることが好ましい。
ベースフィルム11bには、導電性高分子との密着性を高めるプライマー層や、表面保護層、帯電防止等を目的とするオーバーコート層などを設けて表面処理を施すこともできる。
センサ電極14の層厚は、0.04μm~1.0μmが好ましく、0.06μm~0.4μmがさらに好ましい。層厚が0.04μm未満であるとセンサ電極14の抵抗値が高くなるおそれがあり、層厚が1.0μmを超えると透明性が低くなるおそれがある。
なお、センサ電極14の層厚は、ベースフィルム11bにセンサ電極14を形成して原子間力顕微鏡(AFM)を用いて測定することができる。
配線の厚さは1.0μm~20μmとすることが好ましい。1.0μm未満では配線の抵抗値が上昇しやすく、ノイズの原因になるおそれがある。一方、20μmを超えると、段差が大きくなることから、レジスト11cを塗布するときに気泡が入るおそれが高くなる。
レジスト11cとなる樹脂には、硬質の樹脂が選択され、例えば、アクリル系やウレタン系、エポキシ系、ポリオレフィン系の樹脂、その他の樹脂を用いることができ、透明性が要求される場合には透明性のある樹脂が用いられる。
表面保護層15の厚みは、センサ電極層16を保護する所望の保護効果が得られる範囲で薄い方が好ましい。薄い方がセンサ感度を高めることができるからである。また、裏面保護層17よりも薄いことがより好ましい。操作者が操作面を触れたときの静電容量変化を大きくし、誤動作を起こし難くすることができるためである。
抑止部材17aとする裏面保護層17の誘電率を低くする方法としては、素材自体に誘電率の低い材料を用いたり、空気層を構成することを例示することができる。より具体的には、誘電率が比較的低い、シリコーン系の材料やポリテトラフルオロエチレン等のフッ素系樹脂や発泡体を用いる方法、表面に突起を形成して空気層を形成させる方法などを挙げることができる。
変形例:
このように、表面保護層15と裏面保護層17の誘電率差を利用する場合には、表面保護層15と裏面保護層17を別材質とすることが容易であるが、表面保護層15と裏面保護層17を同材質としてもその厚みを変えることで調整できる。
第2実施形態[図4]:
ウェアラブルタッチセンサ21の製造は、裏面保護層17上にセンサ電極14を印刷形成し、表面保護層15を積層して行うことができる。
こうした態様としても、裏面2bが身体に触れたり触れなかったりといったことが起きても誤動作が起こりにくいデバイス20とすることができる。
第3実施形態[図5]:
より詳細に説明すれば、ベルト2の全体がウェアラブルタッチセンサ31であり、図5右側に位置するベルト2も、ウェアラブルタッチセンサ31を構成する裏面保護層17と表面保護層15との積層部分で構成されている。また、制御部12も裏面保護層17の上に固着されて一体となっている。
こうした態様としても、裏面2bが身体に触れたり触れなかったりすることによる誤動作が起こりにくいデバイス30とすることができる。
第4実施形態[図6]:
裏面保護層17は、絶縁部19とともに導電性の抑止部材17bを有している。導電性の抑止部材17bは、銅やアルミニウム、ステンレス等の金属材料、銀粉末や銅粉末を樹脂に分散した導電性樹脂、あるいは導電性高分子で形成することができる。図6では、抑止部材17bが外装となるように最外層に配置している。
第5実施形態[図7]:
裏面保護層17は、絶縁部19とは別に導電性の抑止部材17cを有し、抑止部材17cは、ベースフィルム11bの裏面に固着して設けられている。このようにしても、センサ電極14は抑止部材17cで覆われているので、裏面保護層17に操作者が触れても、センサ電極14が静電容量の変化を検出しないようにすることができる。
例えば、裏面保護層17を、低誘電率の材質で且つ厚膜に形成することもできるし、抑止部材17a~17cはそれぞれ別の実施形態にも適用できる。また、センサシート11aでセンサ電極層16を形成したところをセンサ電極14の単独層とすることができ、また、その逆も可能である。
さらに、制御部12に表示部1を有するものとしたが、表示部1を備えないものであっても良く、制御部12での処理データをPC等で表示できるように制御部12を形成しても良い。
上述の説明では、指でタッチ操作する面を「表面」、腕などの接触する面を「裏面」としたが、腕などとの接触を検知する用途に用いる場合には、腕などに接触する面を「表面」とし、その反対側の面を「裏面」とすることができる。
また、裏面の一部に抑止部材を設けない部位を備えることで、その部位のセンサ電極層によって裏面の静電容量の変化を検知するようにしても良い。
1.各試料の作製
<試料1>:
ウェアラブルタッチセンサを模した以下に示す試料1を作製した。試料1の平面図を図8で示す。
まず、帯状で厚さ100μmのポリエチレンテレフタレートフィルム(ベースフィルム(11b))の一方面にセンサ電極(14)およびレジスト(11c)が積層したセンサシート(センサ電極層)(11a)を作製した。より具体的には、幅が20mmで、長さが180mmのベースフィルム(11b)の表面に透明導電性インキで幅15mm×長さ25mmのセンサ電極(14)となる導電部を6つ形成し、各センサ電極(14)からベースフィルム(11b)の一方端まで伸びる配線(20)を形成し、その上に透明なポリウレタン系樹脂インキを用いてレジスト(11c)を形成した。このとき配線の前記一方端はレジスト(11c)で覆わず、カーボンインキを重ねて端子(21)とした。センサ電極(14)、配線(20)、レジスト(11c)、端子(21)は、ともにスクリーン印刷で形成した。
裏面保護層を厚さ1mmのシリコーン発泡層とした以外は、試料1と同様にして試料2を作製した。
<試料3>:
裏面保護層を厚さ3mmのシリコーンゴム層とした以外は、試料1と同様にして試料3を作製した。
裏面保護層を、厚さ1mmのシリコーンゴム層からなる絶縁部と、その外側表面に設けた厚さ12μmのアルミニウム箔からなる抑止部材とで構成した以外は、試料1と同様にして試料4を作製した。
<試料5>:
試料4において、抑止部材(アルミニウム箔)を測定装置のグラウンド(アース)に接続した以外は、試料4と同様にした試料5を作製した。
裏面保護層を、センサシートの裏面に積層して設けた厚さ12μmのアルミニウム箔からなる抑止部材と、抑止部材を覆うように設けた厚さ1mmのシリコーンゴム層からなる絶縁部とで構成した以外は、試料1と同様にして試料6を作製した。試料6は、センサ電極と抑止部材とは、ポリエチレンテレフタレートフィルムを介して絶縁状態となっている。
<試料7>:
試料6において、抑止部材(アルミニウム箔)を測定装置のグラウンド(アース)に接続した以外は、試料6と同様にした試料7を作製した。
各試料について、センサ電極と接続した配線をPSoC IC(サイプレス社製マイコン CY8C24894)に接続して感度(Diff)を測定した。PSoC ICのパラメータ設定は、Resolution(分解能)を13bit(8192)、Ref Valueを4、Rb抵抗を3.3KΩとした。
感度試験2: 各試料を、裏面が素肌に接触するように腕に装着して、装着前後の感度の変化を測定した。この測定値をN(ノイズ)とする。
感度試験3: 各試料について、感度試験2の腕に装着した状態で、表面を指で触ったときの感度の変化を測定した。この測定値をS2とする。
S/N比: 表面を指で触れたときの感度の変化をシグナル(S1、S2)、裏面が腕に触れたときの感度の変化をノイズ(N)としてS/N比を計算した。
以上の結果を次の表1に示す。
試料1は、S1/N比およびS2/N比が共に1.0未満であった。すなわち、シグナルよりノイズの方が大きいため、シグナルを識別できないという結果であった。試料2~試料7は、何れもS1/N比およびS2/N比が共に1を超え、シグナルを識別できる結果となった。
2 ベルト
2a 表面
2b 裏面
3 結合部
10,20,30,40,50 ブレスレット型デバイス
11,21,31,41,51 ウェアラブルタッチセンサ(タッチセンサ)
11a センサシート
11b ベースフィルム
11c レジスト
12 制御部
13 帯部
14 センサ電極
15 表面保護層
16 センサ電極層
17 裏面保護層
17a,17b,17c 抑止部材
19 絶縁部
20 配線
21 端子
Claims (8)
- 複数のセンサ電極を有するセンサ電極層を備え、操作面側に位置する表面保護層と操作面とは反対面側に位置する裏面保護層とが積層したタッチセンサにおいて、
操作面とは反対側からの静電容量変化を感知し難くする抑止部材を裏面保護層に設けたことを特徴とするタッチセンサ。 - センサ電極層が、ベースフィルムと、そのベースフィルムの一方面に形成された複数のセンサ電極と、そのセンサ電極を覆うレジストとを備えるセンサシートからなる請求項1記載のタッチセンサ。
- 抑止部材に、肉厚が表面保護層の3倍以上の絶縁部を含む請求項1または請求項2記載のタッチセンサ。
- 抑止部材に、表面保護層に比べて誘電率が低い絶縁部を含む請求項1~請求項3何れか1項記載のタッチセンサ。
- 抑止部材に、操作面に対する垂直方向においてセンサ電極に少なくとも一部が重なるように位置した導電部を含み、かつこの導電部はセンサ電極に対して絶縁状態にある請求項1~請求項4何れか1項記載のタッチセンサ。
- 導電部をグラウンドに接続した請求項5記載のタッチセンサ。
- 操作面とは反対面側に操作者の身体の一部が接触するウェアラブルタッチセンサである請求項1~請求項6何れか1項記載のタッチセンサ。
- 請求項1~請求項7何れか1項記載のタッチセンサと、前記センサ電極と導通接続してセンサ信号を処理する制御部とを備えるブレスレット型デバイス。
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WO2017047519A1 (ja) * | 2015-09-17 | 2017-03-23 | ポリマテック・ジャパン株式会社 | 弾性配線部材 |
JP2017076496A (ja) * | 2015-10-14 | 2017-04-20 | サクサ株式会社 | 静電容量型タッチスイッチ及び電話機 |
WO2019139038A1 (ja) * | 2018-01-15 | 2019-07-18 | オムロン株式会社 | ベルト、血圧測定装置、及びベルトの製造方法 |
JP2019122510A (ja) * | 2018-01-15 | 2019-07-25 | オムロン株式会社 | ベルト、血圧測定装置、及びベルトの製造方法 |
JP2020036870A (ja) * | 2018-08-31 | 2020-03-12 | Toto株式会社 | 便座装置 |
JP7179261B2 (ja) | 2018-08-31 | 2022-11-29 | Toto株式会社 | 便座装置 |
WO2020137475A1 (ja) * | 2018-12-27 | 2020-07-02 | オムロンヘルスケア株式会社 | 血圧測定装置 |
JP2020103630A (ja) * | 2018-12-27 | 2020-07-09 | オムロンヘルスケア株式会社 | 血圧測定装置 |
JP7202886B2 (ja) | 2018-12-27 | 2023-01-12 | オムロンヘルスケア株式会社 | 血圧測定装置 |
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US20170038797A1 (en) | 2017-02-09 |
JPWO2015166888A1 (ja) | 2017-04-20 |
US10754378B2 (en) | 2020-08-25 |
CN106255946B (zh) | 2019-06-28 |
CN106255946A (zh) | 2016-12-21 |
JP6601803B2 (ja) | 2019-11-06 |
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