JP2013182374A - Sense presenting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device that presents a perceptible sense (tactile sense) by being touched by a person, capable of presenting various types of the sense, for example, a surface shape (texture) of an object, an uneven shape, and a click feeling.SOLUTION: A sense presenting device (20) employs a laminate (10) in which electrostrictive material layers (1 and 1') are superposed along with a first electrode (3a and 3a') and a second electrode (3b and 3b') that sandwich the electrostrictive material layers therebetween.

Description

  The present invention relates to a sensation presentation apparatus, and more particularly to an apparatus that presents a sensation perceivable by human touch.

  A device that simulates a sensation perceived by a human (user) touching, that is, a (broad sense) tactile sensation, has been actively studied in fields such as virtual reality. In particular, the skin sensation of the fingertip can be grasped by tracing the surface of the object, so that the surface properties, for example, the texture (or texture) expressed by words such as “rough” and “smooth” can be grasped. There is a demand for a device that reproduces the above in a pseudo manner.

  As a conventional sensation presentation apparatus, there is a skin sensation presentation apparatus that transmits a skin sensation to a user's finger by a user operating a movable member on the fixed member with a finger (see Patent Document 1). More specifically, in this apparatus, a plurality of strip electrodes are arranged in parallel with each other on both the movable member and the fixed member, and a multiphase voltage is applied to these strip electrodes to generate a potential distribution, thereby moving the movable member. Coulomb force is applied between the fixed member and the fixed member. In this state, when the user puts his finger on the movable member and slides the movable member in a direction crossing the strip electrode with respect to the fixed member, the user feels the action of Coulomb force through the movable member on the fingertip, and By this sliding operation, the potential distribution and thus the Coulomb force change, and this makes it possible to give the user a skin sensation as if he / she perceives the texture as if he / she traced the object surface with his / her fingertip.

JP 2002-41208 A

  In recent years, sensory presentation devices have been required to present not only surface properties (for example, texture) of an object but also more complex sensations, such as reproduction by combining the uneven shape of the object and its surface property. .

  However, since the above-described conventional skin sensation presentation device presents a skin sensation using the illusion due to the change in Coulomb force, even if the surface texture of an object with relatively small irregularities can be reproduced, It is difficult to realistically reproduce even a relatively large uneven shape, or to combine and reproduce the uneven shape of an object and its surface property.

  Further, in the above-described conventional skin sensation presentation device, it is necessary to form electrode patterns on both the movable member and the fixed member, and the structure is complicated, and the direction in which the finger is moved (operation direction) depends on the arrangement of the electrode patterns. There is also the difficulty of being restricted.

  On the other hand, in the field of touch panels, various touches are fed back to the fingertips, such as giving a feeling of clicking or pushing when touching a predetermined area of the panel, or giving a stimulus for the purpose of preventing erroneous operation (so-called tactile feedback). There is a need for sensory presentation devices that can do this. As such a sensory presentation device, an oscillation device that actually vibrates the entire panel using resonance of a piezoelectric ceramic element or the like is known. However, since such a conventional oscillation device vibrates the entire panel, there is a problem that power consumption is large. Furthermore, with the rapid spread of smartphones, there is a growing demand for smaller and lighter devices.

  Then, it can be considered that the above-described conventional skin sensation presentation device is used for the touch panel instead of the conventional oscillation device. However, in the conventional skin sensation presentation device, since the user needs to place his / her finger on the movable member and move it with respect to the fixed member, do not move the finger on the movable member (in the in-plane direction of the panel). If you are, you cannot present a skin sensation. Therefore, when the user touches the touch panel, it is not possible to give a skin sensation that leads to a click feeling, a push-in feeling, or a stimulus at the place (fixed point).

  The present invention provides an apparatus that presents a sensation (tactile sensation) that can be perceived by human touch, and can present various sensations such as a surface property (texture), an uneven shape, and a click feeling of an object. For the purpose.

  According to the present invention, there is provided a sensory presentation device including a laminate in which an electrostrictive material layer is laminated with first and second electrodes sandwiching the electrostrictive material layer. When a voltage is applied between the first and second electrodes, the electrostrictive material layer sandwiched between them is distorted in the thickness direction by the application of an electric field. In the sensory presentation device of the present invention, since the electrostrictive material layers are laminated and used, the thickness per layer is reduced, and a larger electric field application can be obtained with respect to a predetermined applied voltage. A greater distortion can be obtained and a perceivable sensation can be presented by human touch. In addition, when the same electric field application condition is used, the voltage to be applied can be lowered by increasing the number of stacked layers.

  In general, the magnitude of the strain of the electrostrictive material layer changes in a quadratic function according to the applied electric field, and by selecting the applied electric field appropriately, it can be of any magnitude within the range of the maximum strain. Displacement can be realized. Therefore, in the sensation presentation device according to the present invention, when a voltage signal, for example, an AC voltage is applied between the first and second electrodes, the electrostrictive material layer sandwiched between them responds to fluctuations in the applied electric field. The surface properties (texture, friction characteristics, etc.) of an object perceived when a person traces the object surface with his / her finger can be reproduced in a pseudo manner by expanding and contracting in the thickness direction and then vibrating and adjusting the frequency. it can. When a pulse voltage (for example, a rectangular wave voltage) is applied between the first and second electrodes or a DC voltage is applied (or switched on / off), the upper surface of the electrostrictive material layer can be greatly moved up and down in the thickness direction. By appropriately setting the magnitude of the displacement, it is possible to actually faithfully reproduce the uneven shape (or undulation) of the object perceived when the object surface is traced with a finger. Even when an AC voltage is applied between the first and second electrodes, the upper surface of the electrostrictive material layer can be moved up and down in the thickness direction by adjusting the bias voltage, and the magnitude of the displacement can be appropriately adjusted. By setting to, it is possible to actually faithfully reproduce the uneven shape of the object perceived when the object surface is traced with a finger. Furthermore, by such vertical movement, it is possible to present a sensation that humans can perceive as a click feeling, a push-in feeling or a stimulus at a fixed point. In addition, if the voltage signal applied between the first and second electrodes is appropriately controlled, for example, if both the frequency of the alternating voltage and the bias voltage are controlled, the uneven shape of the object and its surface property are combined and reproduced. You can also Therefore, according to the sensation presentation apparatus of the present invention, it is possible to present various sensations such as the surface properties (texture, friction characteristics, etc.), uneven shape, and click feeling of the object.

  Such a sensory presentation device of the present invention has a simple structure as compared with a conventional skin sensation presentation device, and there is no limitation on the direction in which the finger is moved. Furthermore, since the sensory presentation device of the present invention can be locally incorporated in the touch panel and does not need to vibrate the entire panel, it consumes less power and is smaller and lighter than conventional oscillators. Can be realized.

  The electrostrictive material layer used in the sensory presentation device of the present invention is preferably distorted by 2% or more in the thickness direction of the electrostrictive material layer when an electric field of 100 V / μm is applied. As a result, a sensory presentation device suitable for identifying a concavo-convex shape by a human touch with a fingertip can be obtained.

  In one aspect of the present invention, the first and second electrodes may be respectively connected to an external electrode or drawn to the outside at two different end faces of the laminate. According to this aspect, it is possible to separately and easily perform external electrode formation or lead-out to the stacked first and second electrodes.

  In one embodiment of the present invention, the first and second electrodes are made of an organic conductive material. According to this aspect, it is difficult for cracks to be introduced into the electrode, and a more reliable sensory presentation device can be obtained.

  In one aspect of the present invention, the laminate is formed by winding and flattening an electrostrictive material layer in a cylindrical shape together with first and second electrodes sandwiching the electrostrictive material layer. The electrostrictive material layer can be a flexible film, and can be easily laminated by forming the first and second electrodes on the film and winding them into a cylindrical shape, and further flattening it. Thus, the volume efficiency can be increased.

  The sensory presentation device of the present invention may include a plurality of the laminates, and the plurality of laminates may be arranged in an array. Such a sensation presentation device can individually control the operation of the laminated body, so it can reproduce the discontinuous uneven shape of the object perceived when the object surface is traced with a finger, or generate multiple vibrations. The regions can be provided independently of each other, or the sensation can be presented on a relatively wide contact surface such as a human palm.

  ADVANTAGE OF THE INVENTION According to this invention, the sensory presentation apparatus which can perceive and touch a human being and can show a various sensation is provided by using an electrostrictive material layer by laminating | stacking.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the sensory presentation apparatus in one embodiment of this invention, Comprising: (a) is a perspective view, (b) And (c) is a partial exploded sectional view of XX direction, Electrostrictive material layer And arrangement examples of the first and second electrodes are shown. In the embodiment of FIG. 1, it is a schematic diagram explaining the manufacturing method of the sensory presentation apparatus which concerns on the example of arrangement | positioning of FIG.1 (b), Comprising: (a) is a perspective view, (b) is an AA direction cross section. FIG. It is a schematic diagram explaining the manufacturing method of the sensory presentation apparatus which concerns on the example of arrangement | positioning of FIG.1 (b) among embodiment of FIG. In the embodiment of FIG. 1, it is a schematic diagram explaining the manufacturing method of the sensory presentation apparatus which concerns on the example of arrangement | positioning of FIG.1 (c), Comprising: (a) is a perspective view, (b) is a BB direction cross section. FIG. It is a schematic diagram explaining the manufacturing method of the sensory presentation apparatus in embodiment of FIG. 1, Comprising: (a) is a perspective view which shows the process of flattening a substantially cylindrical laminated body in the arrow direction, (b). These are top views which show the process of forming an external electrode in the laminated body obtained by this. (A)-(c) shows the graph (right side) which shows the relationship between the input voltage and time in the Example of this invention, and the image figure (left side) of the object surface perceived from the sense of a fingertip. In the Example of this invention, the graph of the voltage input into the sensory presentation apparatus from the power supply and the graph of the position display value which measured the laminated body upper surface position simultaneously with this are shown.

  A sensory presentation device according to one embodiment of the present invention will be described in detail below with reference to the drawings.

  With reference to Fig.1 (a), the sensory presentation apparatus 20 of this embodiment contains the laminated body 10 on which the electrostrictive material layer was laminated | stacked with the 1st and 2nd electrode which pinches | interposes an electrostrictive material layer. . The sensory presentation device 20 includes an external electrode 11a connected to the first electrode and two external electrodes connected to the second electrode on two different end surfaces of the laminate 10 (two opposing end surfaces in the illustrated embodiment). 11b, and these external electrodes 11a and 11b are connected to a power source V.

  The first and second electrodes may be disposed so that the electrostrictive material layer is sandwiched between them and the first and second electrodes are not in direct contact with each other. For example, as shown in FIG. 1 (b), the first electrodes 3a and 3a ′ are present in a total of two layers between the adjacent electrostrictive material layers 1 and 1 ′, and the second electrodes 3b and 3 ′ 3b ′ may be present in a total of two layers. In this case, the first electrodes 3a and 3a ′ are connected to the external electrode 11a at one end face of the multilayer body 10, and the second electrodes 3b and 3b ′ are connected to the external electrode 11b at another end face of the multilayer body 10. Connected. Also, for example, as shown in FIG. 1C, the first electrode 3a exists in one layer and the second electrode 3b exists in one layer between the adjacent electrostrictive material layers 1a and 1b. You can do it. These arrangement examples will be described later in detail in relation to the method for manufacturing the sensory presentation device of the present embodiment. In this case, the first electrode 3 a is connected to the external electrode 11 a at one end face of the multilayer body 10, and the second electrode 3 b is connected to the external electrode 11 b at another end face of the multilayer body 10.

  The electrostrictive material layers 1, 1 ', 1a, and 1b are formed from a polymer electrostrictive material. The polymer electrostrictive material is not particularly limited as long as it is a polymer material having a permanent dipole. Examples of the polymer electrostrictive material include PVDF (polyvinylidene fluoride), a PVDF copolymer, for example, a copolymer such as P (VDF-TrFE) and P (VDF-VF), and P (VDF-TrFE). -CFE), P (VDF-TrFE-CTFE), P (VDF-TrFE-CDFE), P (VDF-TrFE-HFA), P (VDF-TrFE-HFP), P (VDF-TrFE-VC), etc. Terpolymers (P is poly, VDF is vinylidene fluoride, TrFE is trifluoroethylene, CFE is chlorofluoroethylene, CTFE is chlorotrifluoroethylene, CDFE is chlorodifluoroethylene, and HFA is hexa. Fluoroacetone, HFP is hexafluoropropylene, VC is vinyl chloride The, VF denotes a vinyl fluoride). Among these, P (VDF-TrFE-CFE) is particularly preferable in that a large distortion can be obtained. The thickness of the electrostrictive material layers 1, 1 ′, 1 a, and 1 b may be set as appropriate, but may be, for example, about several μm to 100 μm. The electrostrictive material layers 1, 1 ′, 1 a, and 1 b may have different polymer electrostrictive materials and thicknesses for each arrangement example, but are preferably the same.

  The first electrode 3a, 3a 'and the second electrode 3b, 3b' may be formed of any appropriate conductive material as long as they can function as electrodes. As such a conductive material, an organic conductive material is preferable because cracks are hardly introduced. Examples of the organic conductive material include PEDOT (polyethylenedioxythiophene), PPy (polypyrrole), PANI (polyaniline) and the like, and these are appropriately organic sulfonic acid compounds such as polyvinyl sulfonic acid and polystyrene sulfonic acid. , Dopants such as polyallyl sulfonic acid, polyacryl sulfonic acid, polymethacryl sulfonic acid, poly-2-acrylamido-2-methylpropane sulfonic acid, polyisoprene sulfonic acid can be doped. Among these, poly (3,4-ethylenedioxythiophene) doped with polystyrene sulfonic acid (PEDOT-PSS) is preferable. However, the present invention is not limited to this, and other conductive materials such as Ni (nickel), Pt (platinum), Pt—Pd (platinum-palladium alloy), Al (aluminum), Au (gold), Au—Pd. It is also possible to use a metal material such as (gold palladium alloy). The thicknesses of the first electrodes 3a, 3a 'and the second electrodes 3b, 3b' may be appropriately set according to the conductive material used, but may be, for example, about 20 nm to 10 µm. The first electrode 3a, 3a 'and the second electrode 3b, 3b' may have different conductive materials and thicknesses for each arrangement example, but are preferably the same.

  Next, an example of manufacturing the sensory presentation device according to this embodiment will be described. The following example demonstrates the case where the laminated body 10 is comprised by winding and flattening an electrostrictive material layer with a 1st and 2nd electrode in a cylinder shape.

  First, the electrostrictive material layer, together with the first and second electrodes, is sandwiched between the first electrode and the second electrode so that the electrostrictive material layer is substantially cylindrical (cylindrical or substantially A substantially cylindrical laminate 7 (see FIG. 5A) is formed by winding and stacking in a cylindrical shape (the same applies to the following).

  More specifically, first, two sheets in which at least one of the first and second electrodes is formed on the surface of the electrostrictive material layer are produced, and the first and second electrodes are in direct contact and short-circuited. These two sheets are overlapped so that there is no.

  More specifically, in the case of the arrangement example shown in FIG. 1B, two sheets are overlapped as follows. First, referring to FIG. 2, a sheet in which the first electrode 3a and the second electrode 3b are respectively formed on both surfaces of the electrostrictive material layer 1, and the first electrode 3a ′ on both surfaces of the electrostrictive material layer 1 ′. And a sheet on which the second electrode 3b ′ is formed. Note that these sheets may be produced at the same time (for example, separated from one sheet). Then, these two sheets are overlaid with the first electrodes 3a and 3a 'facing each other or the second electrodes 3b and 3b' facing each other (FIG. 1 (b) shows the latter case as an example). . In this case, since the first and second electrodes are sufficiently in contact with one electrostrictive material layer from both surfaces, loss due to the air layer can be prevented.

  Further, in the case of the arrangement example shown in FIG. 1C, two sheets are overlapped as follows. First, referring to FIG. 4, a sheet in which the first electrode 3a is formed on one side of the electrostrictive material layer 1a and a sheet in which the second electrode 3b is formed on one side of the electrostrictive material layer 1b are prepared. Note that these sheets may be produced at the same time (for example, separated from one sheet). Then, these two sheets are overlapped so that the first electrode 3a and the second electrode 3b are alternately arranged via the electrostrictive material layers 1a and 1b. In this case, since only one of the first and second electrodes has to be formed for one electrostrictive material layer, it can be manufactured with fewer steps.

  The formation of electrodes on the electrostrictive material layer can vary depending on the material used. For example, when an organic conductive material as described above is used as the electrode material, a mask is disposed on the electrostrictive material layer, and an organic conductive material-containing liquid (for example, ink or paint is commercially available from the top). A uniform electrode pattern can be formed by spraying, and drying and / or heating as appropriate, and then removing the mask. Note that, depending on the viscosity of the liquid containing the organic conductive material, inkjet, brush coating, screen printing, or the like is also applicable. However, the present embodiment is not limited to this. For example, when the metal material as described above is used as the electrode material, vapor deposition, sputtering, or the like can be applied.

  Next, the two sheets superposed as described above are wound around the substantially cylindrical core 5 and laminated, for example, as shown in FIG. Form. The winding core 5 may be hollow or solid as long as it can be held during winding. And after forming a laminated body, the core 5 is extracted from a laminated body, and the substantially cylindrical laminated body 7 as shown to Fig.5 (a) is obtained. The dimensions and number of layers of the laminate may vary depending on the desired use and specification of the sensory presentation device.

  Then, by applying at least one of an external force and heat to the substantially cylindrical laminated body 7, it is flattened in the direction of the arrow shown in FIG. The external force is applied manually or mechanically, or by vacuum suction (for example, a method in which the laminated body 7 is put in a pack or bag, the inside is evacuated, and crushed by air pressure from the outside), etc. May be. Heat can act on the electrostrictive material layer and can be molded. For example, heat of around 100 ° C. can be applied.

  Thereby, the laminated body 10 by which the electrostrictive material layer was laminated | stacked with the 1st and 2nd electrode is obtained. When the laminated body 10 is configured by winding and flattening the electrostrictive material layer together with the first and second electrodes into a cylindrical shape as in this production example, bending when flattening is performed. On the end face of the laminated body 10 corresponding to the portion (in FIG. 5B, the upper and lower end faces of the laminated body 10 located on the upper, lower, left and right sides), the laminated structure is not secured in the height direction of the laminated body 10. As shown to 1 (a), in order to show a feeling by putting a finger | toe on the upper surface approximate center of the laminated body 10, it does not interfere.

  Next, in the laminate 10 obtained as described above, the external electrodes 11a and 11b are respectively connected to the first electrodes 3a and 3a ′ and the second electrodes 3b and 3b ′ as shown in FIG. 5B. Connect and form. The material of the external electrodes 11a and 11b is not particularly limited, and any appropriate electrode material may be used. For example, by using a conductive paste, this is applied to a predetermined end face (end face where the edge portions of the first and second electrodes are respectively located) of the laminate 10 and subjected to heat treatment, whereby the external electrode 11a. , 11b can be connected to the first electrodes 3a, 3a ′ and the second electrodes 3b, 3b ′, respectively. The external electrodes 11a and 11b are connected to a power source V when the sensory presentation device 20 is used, as shown in FIG.

  Alternatively, instead of the external electrodes 11a and 11b, the first electrodes 3a and 3a ′ and the second electrodes 3b and 3b ′ are led out of the stacked body 10 and connected to the power source V using lead wires. May be.

  As described above, the sensory presentation device 20 of the present embodiment is manufactured. However, the manufacturing method of the sensory presentation device 20 of the present embodiment is not limited to such a manufacturing example. For example, a plurality of flattened laminates may be produced and used by overlapping them. Further, for example, according to the arrangement example shown in FIG. 1B or 1C, the laminate 10 may be manufactured by sequentially laminating the electrostrictive material layer and the first and second electrodes. Further, for example, the ends of two sheets in which at least one of the first and second electrodes is formed on the surface of the electrostrictive material layer are overlapped so that the longitudinal directions thereof are orthogonal to each other, and the first and second The laminate 10 may be produced by alternately laminating and folding these sheets alternately so that the electrodes do not directly contact and cause a short circuit.

  The sensory presentation device 20 according to the present embodiment is small, lightweight, and has low power consumption. In addition, the sensory presentation device 20 according to the present embodiment has a high impact resistance and is broken if a polymer material is used for the electrostrictive material layer and an organic conductive material is used for the first and second electrode materials. The advantage that it is difficult is obtained.

  Next, although the example of the usage method (operation | movement) of the sensation presentation apparatus 20 is demonstrated, the sensation presentation apparatus of this invention is not limited to this usage method.

  In the sensation presentation device 20, when a voltage signal is applied between the first and second electrodes from the power source V, the electrostrictive material layer positioned between them is distorted by the electrostrictive effect caused by the electric field application. 10 is deformed to cause displacement. Therefore, the laminated body 10 can be understood as a laminated electrostrictive actuator. The strain direction of the electrostrictive material layer with respect to the electric field direction is 31 directions (direction perpendicular to the electric field direction, in other words, in-plane direction of the electrostrictive material layer) and 33 directions (direction parallel to the electric field direction, In other words, the thickness direction of the electrostrictive material layer may be present, but in the present invention, the strain is preferably in the 33 direction, in other words, the thickness direction of the electrostrictive material layer. The strain in the 31 direction of the electrostrictive material layer can be selected by providing an anisotropy in a predetermined direction in advance by stretching the electrostrictive material layer.

  More preferably, the electrostrictive material layer is distorted by 2% or more in the thickness direction of the electrostrictive material layer when an electric field of 100 V / μm is applied. The polymer electrostrictive material described above as the material of the electrostrictive material layer can be shrunk by 2% or more in the thickness direction of the electrostrictive material layer by applying an electric field of 100 V / μm. When the surface of an object in contact with a human fingertip is deformed (causes displacement), the finger itself is deformed by the contact reaction force, and the sensory organs inside the finger are stimulated and perceived as a tactile sensation. . In general, it is said that the tactile sensation of a human fingertip can identify an uneven shape if there is a displacement of 300 μm. Assuming that an electric field of 100 V / μm is actually applied to the electrostrictive material layer, if the total thickness of the laminated electrostrictive material layers is 15 mm or more, a displacement of 2%, that is, 300 μm or more is obtained. When the user traces the upper surface of the laminate 10 with a fingertip, or the user places a finger on the laminate 10 as shown in FIG. 1A, the laminate 10 is placed on an arbitrary plane (not shown). By sliding with, the user can perceive the uneven shape. The voltage applied to obtain such displacement is not particularly limited as long as the level of the voltage signal changes greatly. For example, application of a pulse voltage such as a rectangular wave voltage, switching of DC voltage on / off, bias voltage with respect to AC voltage Adjustments can be used.

Moreover, although the polymer electrostrictive material described above depends on the applied electric field and other conditions, a force of about 0.3 MPa (about 30 g / mm ² ) can be generated. In general, it is said that the lower limit of the tactile sensation at a human fingertip is 3 g / mm ² . Therefore, if such a polymer electrostrictive material is used, a force capable of sufficiently perceiving pressure (contact reaction force) can be generated, and when the user touches the upper surface of the laminate 10, the spot (fixed point) Thus, it is possible to perceive a feeling of clicking or pushing.

  On the other hand, the surface texture (texture) of the object can be detected by the fingerprint of the finger, and the surface texture (texture) is perceived by vibration at several Hz or more, depending on the speed of moving the finger (tracing the object surface). For example, at several tens of Hz, it is said that it can be perceived with an amplitude of several μm. The frequency that gives a rough sensation can be, for example, about several Hz to several tens of Hz (5 to 50 Hz), and the frequency that gives a smooth sensation can be higher than that, for example, about 100 to 200 Hz. Therefore, if a voltage signal having such a frequency, for example, an AC voltage is applied, the user traces the upper surface of the laminate 10 with a fingertip, or the user places a finger on the laminate 10 as shown in FIG. By sliding the laminated body 10 on an arbitrary plane (not shown), the user can perceive the surface property of the object that is simulated.

  The sensory presentation device and the method of using the sensor presentation device in one embodiment of the present invention have been described in detail above, but the present invention can be modified in various ways. For example, a plurality of laminates as described above may be produced and arranged in an array, and such a sensory presentation device can be used by being embedded in the panel surface.

  On a carrier film made of PET (polyethylene terephthalate), P (VDF-TrFE-CFE) as a vinylidene fluoride resin material is cast with a thickness of 10 μm, and peeled from the carrier film, thereby fluorinated as an electrostrictive material layer. A sheet of vinylidene resin material was prepared. Then, a commercially available PEDOT-PSS solution is sprayed on both sides of the electrostrictive material layer through a mask and dried to form electrodes having a thickness of 0.2 μm. Thus, electrodes are formed on both sides of the electrostrictive material layer. Two sheets were formed (see FIG. 2A). Next, the two sheets are overlapped (see FIG. 2B), wound around a cylindrical core (see FIG. 3), the core is removed, and a substantially cylindrical laminate. (See FIG. 5A). The obtained substantially cylindrical laminate is heated to 60 to 80 ° C., crushed at a pressure of about 98 MPa, and thermocompression bonded to flatten the substantially cylindrical laminate so that the electrostrictive material layer is about A laminated body having an area of 10 mm × 10 mm and a height of about 5 mm laminated with 500 layers was produced. An external electrode-forming Ag paste (Ag powder dispersed with a thermosetting resin such as an epoxy resin) is applied to both end faces of the laminated body where the edges of the electrodes are located, and 60 to 70 An external electrode was formed by thermosetting at a temperature of 0 ° C. (see FIG. 5B). An annealed copper wire as a lead wire is joined to the external electrode, and this is connected to an external power source (programmable power source) so that a voltage signal can be applied to the laminate, thereby producing the sensory presentation device of the present invention (FIG. 1A )reference).

  When the input voltage from the external power source to the sensory presentation device is controlled so as to change the bias voltage (which may be originally zero) and the frequency in the middle, the laminate is distorted and its upper surface position is displaced. Schematically, referring to the graph on the right side of FIG. 6A, for example, after the bias voltage is increased halfway while maintaining a certain relatively low frequency (about 5 to 50 Hz) for the input voltage. If the control is performed so that the original bias voltage is restored, the distortion (displacement) also changes in the same manner. While performing such control, when a finger is placed on the top surface of the laminate and the laminate is moved with the finger and slid on the plane, the change in distortion is traced with the finger, and the left side of FIG. As shown in the image of, it seems that there are rough projections on the rough surface. For example, referring to the graph on the right side of FIG. 6B, the input voltage is set to a certain bias voltage and a relatively low frequency (about 5 to 50 Hz), and the bias voltage is increased and a higher frequency (100 to In this case, as shown in the image diagram on the left side of FIG. 6 (b), there is a convex portion that is smooth on the rough surface. felt. For example, referring to the graph on the right side of FIG. 6C, the input voltage is alternately switched between a low frequency (about 5 to 50 Hz) and a high frequency (about 100 to 200 Hz) while maintaining a certain bias voltage. If controlled in this way, in this case, as shown in the image on the left side of FIG. 6C, it is felt that the rough surface and the smooth surface are alternately arranged.

  Specifically, the input voltage shown in FIG. 7 was applied as a voltage signal to the sensory presentation device produced above, and at the same time, the position of the top surface of the laminate was measured using a laser displacement meter. More specifically, the upper surface position of the laminate is measured while changing the bias electric field from 0V → 800V → 0V and applying a voltage signal by superimposing a sine wave with a frequency of about 5 Hz and a peak-to-peak voltage difference Vp−p = 150V. did. The measurement result of the position display value is also shown in FIG. As can be understood from FIG. 7, a displacement similar to the strain shown on the right side of FIG. 6 (a) can be applied to the laminate. During this time, a finger is placed on the top surface of the laminate, and the laminate is moved with the finger on the plane. When slid, the sensation of having a rough convex part on the rough surface was obtained.

  The sensory presentation device of the present invention is not particularly limited, but can be incorporated into a virtual reality device, a touch panel, etc., and widely used in various fields such as medical care, welfare, robot industry, entertainment industry, mechatronics, chemistry, and electricity. Can be used.

DESCRIPTION OF SYMBOLS 1, 1 ', 1a, 1b Electrostrictive material layer 3a, 3a' 1st electrode 3b, 3b '2nd electrode 5 Core 7 Substantially cylindrical laminated body 10 Laminated body 11a, 11b External electrode 20 Sensory presentation apparatus V power supply

Claims (6)

  A sensory presentation device including a laminate in which an electrostrictive material layer is laminated together with first and second electrodes sandwiching the electrostrictive material layer.   The sensory presentation device according to claim 1, wherein the electrostrictive material layer is distorted by 2% or more in the thickness direction of the electrostrictive material layer when an electric field of 100 V / μm is applied.   3. The sensory presentation device according to claim 1, wherein the first and second electrodes are respectively connected to external electrodes or drawn out to the outside at two different end faces of the laminate.   The sensory presentation device according to claim 1, wherein the first and second electrodes are made of an organic conductive material.   5. The laminate according to claim 1, wherein the laminate is formed by winding and flattening an electrostrictive material layer in a cylindrical shape together with first and second electrodes sandwiching the electrostrictive material layer. Sensory presentation device.   The sensory presentation device according to any one of claims 1 to 5, comprising a plurality of the stacked bodies, wherein the plurality of stacked bodies are arranged in an array.

Images