EP1456739A2 - Keypad integrated into textile items comprising a capacitive readout circuit - Google Patents

Keypad integrated into textile items comprising a capacitive readout circuit

Info

Publication number
EP1456739A2
EP1456739A2 EP20020799739 EP02799739A EP1456739A2 EP 1456739 A2 EP1456739 A2 EP 1456739A2 EP 20020799739 EP20020799739 EP 20020799739 EP 02799739 A EP02799739 A EP 02799739A EP 1456739 A2 EP1456739 A2 EP 1456739A2
Authority
EP
European Patent Office
Prior art keywords
key
input device
input
means
device according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20020799739
Other languages
German (de)
French (fr)
Inventor
Stefan Jung
Christl Lauterbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FUTURE-SHAPE GMBH
Original Assignee
Infineon Technologies AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE10161598 priority Critical
Priority to DE10161598 priority
Priority to DE2002120642 priority patent/DE10220642A1/en
Priority to DE10220642 priority
Application filed by Infineon Technologies AG filed Critical Infineon Technologies AG
Priority to PCT/EP2002/013748 priority patent/WO2003052541A2/en
Publication of EP1456739A2 publication Critical patent/EP1456739A2/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00Woven fabrics characterised by the material or construction of the yarn or other warp or weft elements used
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00Woven fabrics designed to make specified articles
    • D03D1/0088Fabrics having an electronic function
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00Woven fabrics characterised by the material or construction of the yarn or other warp or weft elements used
    • D03D15/02Woven fabrics characterised by the material or construction of the yarn or other warp or weft elements used the warp or weft elements being of stiff material, e.g. wire, cane, slat
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making or -braking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making or -braking characterised by the way in which the control signal is generated
    • H03K17/96Touch switches
    • H03K17/962Capacitive touch switches
    • H03K17/9622Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00Inorganic fibres
    • D10B2101/20Metallic fibres
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00Physical properties
    • D10B2401/16Physical properties antistatic; conductive
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00Form of contacts
    • H01H2203/008Wires
    • H01H2203/0085Layered switches integrated into garment, clothes or textile
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00Miscellaneous
    • H01H2239/006Containing a capacitive switch or usable as such
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making or -braking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making or -braking characterised by the way in which the control signal is generated
    • H03K17/96Touch switches
    • H03K2017/9602Touch switches characterised by the type or shape of the sensing electrodes
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K2217/00Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96Touch switches
    • H03K2217/9607Capacitive touch switches
    • H03K2217/960755Constructional details of capacitive touch and proximity switches
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/25Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256Heavy metal or aluminum or compound thereof

Abstract

The invention relates to an input device provided with at least one textile fabric carrier (10), at least one flexible, wire-type or thread-type electrical conductor (12) comprising at least one weft thread and/or warp thread (S, K) of the fabric carrier (10), and at least one electroconductive, flexible keypad (14) which is electrically connected to a key connection of the conductor (12), said conductor (12) being designed in such a way that it can be connected to an evaluation device (20).

Description

Keypad in textiles with kapazativer readout circuit

description

The invention relates to an input device according to claim 1 and a method for manufacturing an input device according to claim 17th

The integration of electronic components in textile commodities such as clothing, requires besides the implementation of the electronic circuitry, the implementation of a device for inputting data, in particular a tactile user interface. Despite ever more sophisticated ways of voice control systems in many applications, a key input is still necessary or desirable as are of limited use for a voice control systems in many situations and are there for other key inputs are often more reliable, faster and easier to perform. For example, is not convenient to realize by means of voice control systems, variable volume control.

Prior art attempts, keyboards, input devices integrate into a textile environment, and in particular include the incorporation or sewing in the conventional flexible keyboards in a textile fabric carrier. Further, multilayer fabric structures are known in which by mechanical actuating an electrical contact or

can be generated approximately in the multilayer structure and read resistive or capacitive. Finally, keyboards have been proposed, were stitched their keys as well as supply lines or sewn from conductive and non-conductive strip. Although input devices which have a multi-layered fabric structure, well suited for the realization of localized high-resolution touch sensor (touch pads), since a predetermined by the textile structure array structure is read out. However, a disadvantage is that these systems consist of multi-layered fabrics and that partly a large number of terminals of an electronic evaluation device has to be supplied at the edge of the input surface. Although also known way of input keys of a keypad in particular by embroidery or sewing to be attached to the textile carrier allows a large degree of freedom in the design and arrangement of key devices, however, has the disadvantage that this is downstream, consuming a the textile manufacturing process and thus is costly manufacturing step.

Object of the invention is accordingly to provide an input device which can be integrated in a simple manner in a textile environment and which is amenable to large-scale manufacturing process. Further, it is an object of the invention to provide a method for producing such an input device.

These objects are achieved by an input device with the mentioned in claim 1 and a method having the steps mentioned in claim 17. Preferred embodiments are subject of the dependent claims.

According to the invention, an input device includes at least one textile fabric support; at least one flexible, wire- and / or thread-like electric conductor, which includes at least one weft and / or warp thread of the fabric support; at least one electrically conductive, flexible key device, which is electrically connected to a button terminal of the conductor; wherein the conductor is adapted to be connected to an evaluation device.

The wire-like and / or thread-like electrical conductor is formed through which the signal line of the input device or keyboard, is an integral part of the textile fabric substrate in which it includes at least one electrically conductive weft and / or warp thread of the fabric carrier. Under the textile fabric support a fabric of two, in particular at right angles intersecting thread systems is understood, which - are referred to as warp and weft - as usual. The chain is

Longitudinal direction of the weaving process runs while the weft direction transversely to the weaving direction. The at least one weft and / or warp thread of the fabric carrier, which imparts its conductivity to the electrical conductor, preferably consists of electrically insulating fibers, particularly synthetic fibers, which are spun with a particular electrically insulated, the thin metal wire. Alternatively, it is possible to form the electrical conductor as a thread-like thin metal wire which constitutes a weft or warp thread of the fabric carrier. This thus introduced in the tissue carrier signal line may be formed directly in the manufacturing process of the fabric support, so that no subsequent cost-intensive additional process must be performed. Further, a printed circuit designed in this way is also no foreign matter in the textile environment, as is the case in conventional textile fabric mounted on carriers conventional key devices.

The conductor is electrically connected to an electrically conductive flexible key device. The key means is preferably fixed directly to the textile fabric carrier, wherein the electrical contact between the key means and conductor via an electrical connection terminal of the key with the key device takes place. The head further comprises an evaluation device which is for connection to an evaluation device, in particular an integrated circuit, is designed. The evaluation device can also be connected through the interposition of additional conductors with the Auswerteanschluß.

Preferably the key means comprises a conductive adhesive, in particular a conductive silicone. Preferably, a polyorganosiloxane is used, which has been formed electrically conductive by adding electrically conductive constituents, in particular of carbon or carbon black. Such a key means can advantageously be by means of a printing process, in particular a screen printing process, attach to the textile fabric carrier.

Preferably the key device for a key layer whose thickness is small compared to dimensions of the key sheet in the layer plane and which is fixed flat against the tissue carrier. The key sheet is thus a thin, plate-like layer which is preferably the entire surface attached to the textile fabric carrier. The thickness of the key sheet is small compared to its lateral dimensions. Thus, the key device contributes little to over the textile fabric carrier so that it does not represent a foreign body in the textile environment. Preferably, the conductors on an electrical insulation which can be locally removed for electrical connection with the key device. Preferably, the insulation is thereby removed in a window-like area, at or on which the key device or the keys layer is applied. The removing step can be carried out in particular by thermal or chemical attack, in particular by means of an etching step or Laserabiation.

Preferably, the input apparatus comprises a plurality of, in particular linear or arrayed-key devices. Particularly preferred is a matrix-like arrangement in which the key means assume a regular, grid-like aligned arrangement.

According to a preferred embodiment, the electrically connected to the key devices conductors are electrically connected at intersections with this substantially perpendicular Umkontaktierungsleitern, each of which at least one electrically conductive Schußbzw. include warp thread of the fabric carrier. This "Umkontaktieren" of the conductors, which serve as signal lines for the key means, with substantially perpendicular thereto Umkontaktierungsleitern allows the often relatively far and irregularly spaced conductors on closely adjacent and regularly arranged Umkontaktierungsleiter divert from each other. The often necessary to form a textile "keyboard" large spacing between the conductors can thus be adapted to the typically an order of magnitude smaller contact or guide period of electronic components. The evaluation device is connected in this case to the Umkontaktierungsleiter. Are as head, for example, electrically conductive warp threads of the textile

Tissue carrier is used, the Umkontaktierungsleiter may be formed by weft threads, which have points of intersection with these warp threads. Preferably, the Umkontaktierungsleiter are evenly spaced from each other in the fabric backing disposed. This regular arrangement of Umkontaktierungsleiter simplifies the connection of external components, in particular external electronic components to the Umkontaktierungsleiter. The period of Umkontaktierungsleiter may further be adapted to the typical contact spacings of the evaluation device.

Preferably, the input device comprises an evaluation device for detecting an actuation of at least one of the key devices.

Preferably, a first group of key devices for reference key devices and a second group of

designed key devices as input key devices.

An actuation of a key device is present only when the electric potential of a control-key device from that of a

Reference key device by an external action, for example by electrically connecting ( "shorting") by a

Finger changed.

Preferably, the evaluation device is designed for evaluation of the electrical potential difference or the electrical resistance between one of the input key means and at least one of the reference key devices. Each control-key device is preferably directly electrically connected to the evaluation device, so that the wiring complexity grows linearly with the number of input keys facilities. The reference key devices can be placed on a same electric potential as the electric potential of the input key devices by means of a threshold-value is determined relative to the potential of the reference key devices. An inevitable leakage current between the input and reference key devices can be met by performing "Refresh" cycles, which regenerate the electric potential of the input key devices.

Preferably, the input key devices are connected in series and a high impedance low impedance connected by a carrier arranged in the fabric guide with an input terminal of the evaluation device and the reference key means with a reference terminal of the evaluation device. This makes it possible to evaluate the operation of a control-key device by an analog measuring method, wherein the number of measuring lines of the irrespective of the number

is key devices. The high impedance input connected key devices form a resistive voltage divider, which is formed similarly to the principle of a slide potentiometer. If a control-key device is operated with a reference key means by bringing a finger, so is the key devices touching finger the "sliding contact" of the sliding potentiometer. Preferably, the evaluation device to a detection of an actuation of an input key devices by evaluating the electrical resistance between the input and the reference terminal designed.

According to a further preferred embodiment, the evaluation device is designed to output a control signal when it detects an actuation of at least two of the key devices in a predetermined time sequence. Such a "dynamic pattern recognition" can be advantageously used as a measure against unintentional activation processes of key devices. Traditionally, only reinforcements or stiffening of the textile carrier material to protect against folding operations, which could cause erroneous keystrokes known. And input devices were previously positioned in textile environments such places where they can get as little as possible with foreign objects in contact. According to the invention an accidental triggering of switching operations can be prevented or minimized that the evaluation is not (for example, pressing a button device) waits for a point-like activity, but "dynamic pattern" refers to a. A switching operation or the triggering of a control signal is activated only when a plurality of key devices have been operated in a predetermined sequence in time. For example,

Input methods similar to the "Graffiti alphabet" conventional electronic organizer (Palm PDA) are used, with the difference that no alphanumeric data, but control commands to query.

According to another particularly preferred embodiment, the evaluation device is designed for at least one of the key devices to a capacitive sensing actuation. The evaluation device thus represents a capacitance sensor, which is adapted for detecting changes in the capacitance of the key means to the environment. For example, the capacitance sensor is adapted to detect the change in capacitance of the key device, which is associated with the approach of an object (eg, a finger) to these. Key device and

Evaluation device, thus forming a capacitive proximity switch, which may in particular detect the non-contact actuation of a key device. Particularly preferred is an evaluation device which evaluates not only the capacity of the key means to its surroundings, but also the time rate of change of capacity (dC / dt). This allows the realization of a capacitive

Proximity switch which comprises a dynamic detection or sensing distance (distance finger - key means) having. The greater the speed of approach of the object to the key device, the greater the detection distance. Such as the proximity switch "Mini Probe MTO .2" electronic GmbH, Lauchhammer, Germany, proved - to be particularly suitable have capacitive proximity switches from EDISEN.

A significant advantage of a capacitive

Evaluation is the ability to operate key devices without electrical contact connection between finger and key device. Preferably, the evaluation device is designed such that an actuation of a key device can be detected without this - must be touched - for example by a finger. In a capacitive evaluation of key operations, the key devices can thus be covered by an electrical insulator. For example, the capacitive detection method of keystrokes works even by relatively thick electrically non-conductive materials covering the key device (s). As already described above, the entire input device may / be cleaned sealed tight, for example, plastic (eg, a textile-melt adhesive, as used in the textile industry standard) encapsulated and isolated, mechanically stabilized and machine washable.

Preferably, the input device includes an electrical shielding which is designed for electrical shielding, at least one of the key devices from one side of the textile fabric substrate. The shielding is designed electrical or electromagnetic Störein Lüsse from the side of the textile fabric to prevent the support from which no actuation of the

is to be key means. If the input device, for example, integrated into a garment, the shielding prevented from accidental operation of the key means of the body side of the wearer of the garment. accidental

Actuations of the keys means that could be triggered by a variation in the distance between the garment and the wearer's body can be avoided by a body-mounted shielding device.

Preferably, the shielding means is a thin conductive layer to the at least one key device is arranged spaced from and substantially parallel running. Preferably, the shielding device on a thin, electrically conductive layer which is preferably flexible. For example, the conductive layer is a metal-coated plastic film, a textile fabric with a high proportion of electrically conductive filaments, a metal foil or a printed conductive ink with textile material. The conductive layer is preferably in the range of the key device (s) arranged on the textile fabric carrier. Preferably, the shielding and the conductive layer is connected to ground.

According to the invention includes a method for the preparation of an input device, preferably an input device in accordance with the previously described embodiments, the steps of: providing a textile fabric substrate, which "comprises a flexible, wire- and / or thread-like electrical conductor, at least, the at least one weft and / or warp thread of the fabric carrier comprises, - making an electrically conductive flexible

Key means, which of the keys with a terminal

is electrically connected to the conductor; and

Connecting an evaluation to the head.

Preferably, the attachment of the key device takes place by a printing method, in particular a screen printing method. This allows easy, mass production accessible production of key devices which are well embedded in the textile environment fixed to the textile fabric carrier.

Preferably, an electrical insulation of the conductor prior to the step of attaching the key device is removed locally.

The invention is described below with reference to accompanying drawings of preferred embodiments by way of example. It shows:

Figure 1 is a schematic plan view of an embodiment of an input device according to the invention, wherein the conductors are fed by means of an evaluation device Umkontaktierungsleitern. Fig. 2 is a schematic circuit diagram of a preferred evaluation and their voltage time diagram;

Figure 3 is a schematic plan view of another preferred embodiment of an input device according to the invention with the equivalent circuit diagram. Fig. 4 is a schematic principle illustration of a preferred pattern recognition according to the invention; and Fig. 5 is a schematic cross-sectional view of a preferred embodiment of an input device of the invention with a capacitive evaluation device.

In Fig. 1 a first preferred embodiment of an input device according to the invention. 10 with a textile fabric carrier is referred to, which has a plurality of warp yarns and weft yarns K S. The warp and weft yarns K, S consist preferably largely of electrically insulating synthetic fibers and are thus insulators. However, some of these synthetic fibers selected have Webbed thin metal wires which are electrically insulated. In this way, these selected warp and weft threads is imparted an electrical conductivity so as wire- and / or thread-like electrical conductor 12 constitute. The electrically conductive warp and weft yarns K, S, each of which forms a conductor 12 in the embodiment shown in Fig. 1, are highlighted in Fig. 1 by a thicker line width. It can be connected together to an electrical conductor 12 for redundancy reasons, more particularly adjacent electrically conductive warp and weft threads.

On the fabric support 10 arrayed key devices are set 14 (for example of silicone leifähigem) which are each electrically connected to a conductor extending in the warp direction 12th In the manufacturing process for this purpose was the electrical insulation of the conductors 12, which associated with the

Key means 14 are connected, located in a highlighted in Fig. 1, window-like area, so that a key sheet of the key means can come into direct contact with the thin conductive metal wire 14. Likewise, however, it is possible to provide to improve the electrical contact between the conductors 12 and the associated key means 14 auxiliary electric contact devices on the printed circuit 12 in the region of the key devices fourteenth

The illustrated in Fig. 1 3x3 key arrangement typically has a direction indicated by the arrow lateral dimension of 2 to 10 cm, preferably 5 cm. Since the key means 14 preferably consist of a thin, flexible material which is attached directly to the fabric backing 10, and no external signal lines are required in addition to the conductors 12, the result is an input device which is excellent embedded in the textile environment. The nine extending in the warp direction of conductor 12 are, as shown in Fig. 1, are electrically connected at points of intersection 16 with Umkontaktierungsleitern 18, which extend in the weft direction of the fabric support 10. The selective electrical connection of the conductor 12 with the Umkontaktierungsleitern 18 at the crossing points 16 predetermined electrical connections between the horizontally and vertically extending conductive threads can be produced. This allows the spaced irregularly and lying far apart in part to deflect conductor 12 to closely adjacent, periodically arranged Umkontaktierungsleiter 18th This allows the terminal of an evaluation device 20 is greatly simplified.

If it is a capacitive evaluation device (a capacitance sensor) is in the evaluating device 20, preferably a shielding AE is provided which prevents unwanted capacitive operation of the key means 14 from one side of the fabric carrier 10th The shielding AE (dashed line in Fig. 1) may include a conductive layer which is electrically insulated from the key means and extends substantially parallel thereto. It is sufficient to arrange the shielding AE in a range of the input device, in which the

Key devices are placed fourteenth The evaluation device 20 is connected via conductor 19, preferably by conductive threads, with a (not shown) power supply and actuation inputs (not shown) electronic components.

In Fig. 2 shows a possible preferred evaluation device 20 is shown schematically. When in Fig. 2 (a) embodiment shown, the conductors 12 are directly connected without Umkontaktierungsleiter 18 to the evaluation device 20th A first group of in Fig. 2 (a) key means 14 shown may be placed over the conductor 12 to a defined electric potential, for example ground potential, to act as a reference key devices 14R. A second group of key devices 14 may be directly connected to the active part of the transmitter and is so-called input key means 14E.

The input key means 14E may controlled by a periodic signal Vcharge via a PMOS transistor 22 and a resistor R are charged to the potential Vdd. Furthermore, the source contact of the transistor 22 and the bias resistor R is connected to a functioning as a threshold value buffer 24, which has a high impedance input. The input of the buffer 24 is at the potential Vkey, while the output buffer is at the potential Vdata. The buffer converts the analog signal into a binary signal Vdata Vkey to carry threshold value. If there is no activation of the key devices 14, that is in particular no finger 26 on the key means 14, then the input key devices 14E discharge over time due to unavoidable leakage currents. As long as Vkey but does not fall below a predetermined threshold of the buffer 24, is located on the buffer output signal Vdata an =. 1 Touches a finger 26, which possesses a certain electric conductivity, the key means 14 and includes a key device with a 14E

Reference input key device 14R short, this control-key device is discharged quickly in time 14E, so that within the "Refresh" period, which is shown in Fig. 2 (b) by running perpendicular dashed lines, the potential Vkey under the set threshold value of the buffer 24 falls , The signal Vdata to the buffer output therefore changes from Vdata = Vdata to 1 = 0, with which an actuation of the control-key device is displayed fourteenth

This time course of signals Vdata, and Vkey Vcharge is schematically shown in a voltage-time diagram in Fig. 2 (b). The controlled by the signal Vcharge periodic "refresh" operations are sufficient for the typical leakage current of the otherwise "floating"

keep input key devices 14E from the node Vkey above the threshold limit of the buffer 24th however, by the short circuit between the key devices 14E and 14R, the control-key device 14E is discharged so rapidly that the signal voltage Vdata is set to 0.

With this in connection with FIG. 2 embodiment described a possible evaluation device, each key means 14 is directly related to the

Evaluating device 20 are connected so that the Verdrahtungsund circuit complexity grows linearly with the number of key means. Alternatively, the matrix-like arrangement of the key means 14 can be evaluated by means of an analog measuring method but also the number of measurement lines is independent of the key device number. The embodiment shown in Fig. 3 has two input leads, the terminals of which are denoted by Vref and Vm. Here, the key means 14 as in the illustrated in Fig. 2 embodiment in

Reference key devices 14R and input key device 14E split.

The input key devices 14E are electrically contacted by electrically conductive weft threads S and the reference key devices 14R by electrically conductive warp yarns K. By suitable electrical connections at the crossing points 16 of the electrically conductive warp and weft yarns K, S, a circuit is constructed, which is shown in a simplified equivalent circuit diagram in Fig. 3 (b). The contacting of the conductive weft and warp threads in the fabric support 10 is in this case that a resistive voltage divider is formed similar to the principle of a slide potentiometer chosen so. This touching finger serves as a "wiper", the position of

Finger on the matrix of the key means 14 can be determined by a simple resistance measurement between Vref and Vm, because the input key devices 14E are connected in series.

The reference key devices 14R are placed over electrically conductive warp yarns, which are configured together on a low-potential Vref. The input key devices 14E are connected by very high resistance electrically conductive weft threads S in series. In Fig. 3 (b) resistance R indicated here is the unit resistance of the high resistance electrically conductive weft threads S based on the length of the distance of the key devices 14E. The resulting by the skin conductance of the touching finger electric resistance is referred to in Fig. 3 (b) with Rf. The "short-circuit resistance" between adjacent input and

Reference key devices 14E, 14R is thus R f, wherein R f is much smaller than the unit resistance R. The finger touches a key device 14E together with a reference key means 14R and closes briefly with a short circuit resistance R f, then the position can this actuated

Key device 14R measured by a resistance measurement between nodes Vref and Vm and assign them.

In Fig. 4 are schematic diagrams of an embodiment of an analysis device are shown in which an accidental activation or actuation of a switching operation of a key device can be prevented by a "dynamic pattern recognition". The evaluation device used in this case is designed to detect the temporal order in which the individual keys of the keypad devices 14 are activated. Only when the key means are actuated in a predetermined chronological order, ie in a certain fixed pattern 14 and is detected, a corresponding control signal is output or carried out an associated function. Each of the in Fig. 4 (a) and (b) illustrated key means 14 can in this case each consist of a control-key device 14E and a reference key means consist 14R.

As an example, in Fig. 4 (a) and (b) a variant of a dynamic pattern recognition of a 3X3 keypad specified, which can be used for example for controlling a device for audio reproduction. The arrows each represent the expected for a particular control action by the system strike directions of the finger or actuation sequences of the key matrix. As an example, the volume control (by volume and VOL +), and the forward and rewind (previous next,) was selected here. Recognizes the evaluation of other, not predetermined input pattern, for example, an input pattern, which is shown by the oblique arrow in FIG. 4 (a), there is no output of a control signal. Instead, such non-predetermined pattern to be rejected by the evaluation device and interpreted as an unintended actuations.

Fig. 5 shows a schematic cross-sectional view through a preferred embodiment of an input device having a capacitive evaluation means 20. In the cross section of the electrical connection of one of the key means 14 to the evaluation device 20 is shown by means of electrical connections 16 via an electrically conductive thread 28. The conductive thread 28 is isolated by electrical insulation 30 from the key means 14 and the shielding AE which is a ground plane. The capacitive evaluation means 20, that is, the capacitance sensor is connected via conductor 19 with a (not shown) power supply and external circuits, which process the output signals of the evaluation device 20th For mechanical and chemical protection, the entire

Device may be provided with a water-resistant casing 32, on the surface of a textile top layer is preferably arranged 34th Due to the capacitive coupling between the finger 26 and the key device 14 has no electrically conductive connection between the finger 26 and the key device 14 for operating the key device 14 is required.

In addition to the application of the preferred input devices previously described for data input or control in garments also have applications as a general touch sensors are also conceivable, which can be found, for example, in fabric coatings in the interior equipment, furniture, wall coverings, etc. use. The keys are in this case preferably carried out "invisible" in that they are made of a transparent conductive silicone adhesive. Only the operable dynamic patterns are visually represented for example by the arrows by means of a color print on the fabric support. The user does not notice in this case the underlying matrix structure of the key devices.

LIST OF REFERENCE NUMBERS

10 Gewebeträger

12 Head

14-key device 14E input key device

14R reference key device

16 cross point electrical connection

18 Umkontaktierungsleiter

19 head of evaluation device to external circuits,

20 evaluation

22 transistor

24 threshold value or Buffer

26 fingers 28 of electrically conductive yarn

30 insulation 32 encapsulation

34 textile uppers

AE shielding or conductive layer resistor R

Rf finger resistance

K warp

S weft

Claims

claims
First input device
- at least a textile fabric carrier (10);
- at least one flexible, wire- and / or thread-like electrical conductor (12), which at least one weft and / or warp thread (S, K) of the tissue support (10) comprises;
- at least one electrically conductive flexible key means (14) which is electrically connected to a button terminal of the conductor (12); wherein the conductor (12) for connection to an evaluation device (20) is designed.
2. An input device according to claim 1, wherein said key means (14) comprises a conductive adhesive, and in particular comprises a conductive silicone.
3. An input device according to claim 1 or 2, wherein said key means (14) comprises a key sheet whose thickness is small compared to dimensions of the key sheet in the layer plane and which is fixed flat against the tissue support (10).
4. An input device according to any preceding claim, wherein the conductor (12) having an electrical insulation which is locally removed for electrical connection with the key means (14).
5. An input device according to any preceding claim, wherein the input device comprises a plurality of, in particular linear or matrix-like arrangement of key means (14).
6. An input device according to claim 5, wherein with the key means (14) electrically connected conductor (12) at crossover points in each case (16) substantially perpendicular Umkontaktierungsleiteren (18) are electrically connected to each of which at least respectively one electrically conductive weft . warp thread (S, K) comprise the tissue support (10).
7. An input device according to claim 6, wherein the
Umkontaktierungsleiter (16) evenly spaced from each other in the tissue support (10) are arranged.
8. An input device according to any preceding claim, wherein the input device is a
Evaluation means (20) for detecting an actuation of at least one of the key devices (14).
9. An input device according to claim 8, wherein a first group of key devices as
Reference key means (14R) and a second group of key devices are designed as input key means (14E).
10. An input device according to claim 9, wherein the
Evaluating device (20) is adapted for evaluation of the electrical potential difference or the electrical resistance between one of the input key means (14E) and at least one of the reference key means (14R).
11. An input device according to claim 9 or 10, wherein said input key means (14E) arranged by a in the tissue support (10) conductors (12) in series and a high impedance to an input terminal of the evaluation device (20) and the reference key devices (14R) niederohming to a reference terminal of the evaluation means (20) are connected.
12. An input device according to claim 11, wherein the evaluation device (20) to a detection of an actuation of an input key means (14E) is designed by evaluating the electrical resistance between the input and the reference terminal.
13. An input device according to any one of claims 8 to 12, wherein the evaluation device (20) is adapted to output a control signal when it detects a '' actuation of at least two of the key means (14) in a predetermined time sequence.
14. An input device according to claim 8, wherein the evaluation device (20) is adapted to a capacitive sensing an actuation of at least one of the key devices (14).
15. An input device according to claim 14, wherein the input device includes an electrical shielding means (AE) which is designed for electrical shielding, at least one of the key devices (14) from one side of the textile fabric substrate (10).
16. An input device according to claim 15, wherein the shielding means (AE) is a thin conductive layer which is spaced from and substantially parallel to extend the at least one key means (14).
17. A method for manufacturing an input device comprising the steps of: - providing a textile fabric substrate (10) having at least one flexible, wire- and / or thread-like electrical conductor (12), the at least one weft and / or warp thread (S, K) of the tissue support (10) comprises;
Attaching an electrically conductive flexible key means (14) which is electrically connected to a button terminal of the conductor (12); and
Connecting an evaluation device (20) to the conductor (12).
18. The method of claim 17, wherein the attachment of the key means (14) by a printing process, in particular a screen printing method is performed.
19. The method of claim 17 or 18, wherein an electrical insulation of the conductor (12) prior to the step of attaching the key means (14) is removed locally.
EP20020799739 2001-12-14 2002-12-04 Keypad integrated into textile items comprising a capacitive readout circuit Withdrawn EP1456739A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE10161598 2001-12-14
DE10161598 2001-12-14
DE2002120642 DE10220642A1 (en) 2001-12-14 2002-05-08 Keypad in textiles with kapazativer readout circuit
DE10220642 2002-05-08
PCT/EP2002/013748 WO2003052541A2 (en) 2001-12-14 2002-12-04 Keypad integrated into textile items comprising a capacitive readout circuit

Publications (1)

Publication Number Publication Date
EP1456739A2 true EP1456739A2 (en) 2004-09-15

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EP (1) EP1456739A2 (en)
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US20050069695A1 (en) 2005-03-31
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