WO2013061168A2 - Tactile signalling device, especially for providing picture and graphical information for the visually impaired - Google Patents

Tactile signalling device, especially for providing picture and graphical information for the visually impaired Download PDF

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Publication number
WO2013061168A2
WO2013061168A2 PCT/IB2012/002990 IB2012002990W WO2013061168A2 WO 2013061168 A2 WO2013061168 A2 WO 2013061168A2 IB 2012002990 W IB2012002990 W IB 2012002990W WO 2013061168 A2 WO2013061168 A2 WO 2013061168A2
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WO
WIPO (PCT)
Prior art keywords
carrying body
conducting layer
signalling
membrane members
membrane
Prior art date
Application number
PCT/IB2012/002990
Other languages
French (fr)
Other versions
WO2013061168A3 (en
Inventor
Attila ÁGOSTON
Jacek Baborowski
Sándor FAZEKAS
Yit-Shun LEUNG-KI
Schahrazede MOUAZIZ
Philipp N!EDERMANN
Thomas Overstolz
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Tacmonco Limited
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Publication date
Application filed by Tacmonco Limited filed Critical Tacmonco Limited
Publication of WO2013061168A2 publication Critical patent/WO2013061168A2/en
Publication of WO2013061168A3 publication Critical patent/WO2013061168A3/en

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B21/00—Teaching, or communicating with, the blind, deaf or mute
    • G09B21/001—Teaching or communicating with blind persons
    • G09B21/003—Teaching or communicating with blind persons using tactile presentation of the information, e.g. Braille displays
    • G09B21/004—Details of particular tactile cells, e.g. electro-mechanical or mechanical layout

Definitions

  • Tactile signalling device especially for providing picture and graphical information for the visually impaired
  • the invention relates to a tactile signalling device, especially for providing picture and graphical information for the visually impaired, which contains a carrying body, movable signalling elements arranged on the carrying body, and the signalling elements are connected to a drive unit for moving the signalling elements.
  • Publication document no US 2005/0131490 describes a MEMS device, which contains light-pressure transducers that can be fitted to the retina of the eye, and a membrane capable of deformation. Depending on the intensity of the perceived light the device is able to exert a pressure on the retina, as a result of which it can be suitable for creating a picture in the visually impaired user's brain.
  • the disadvantage of the solution is that the incorporation of the device requires a complicated and expensive surgical intervention, which makes it available only for a few people.
  • a further disadvantage is that it can only be used in the case of certain visually impaired persons, which restricts the possibility of wide use even further.
  • the devices developed for wide usability are based on that they contain a tactile display unit, on the tactile surface of which there are surface parts that can be moved independently from each other. These surface parts can be lifted out from the entire display surface with the hel of some mechanism, and so visually impaired persons are able to sense the picture with the help of this mechanical converting surface, by touching.
  • our aim with the solution according to the invention is to overcome the deficiencies of such known tactile display devices and to create a version, which, due to its simple structural construction can be manufactured at a favourable cost even in a large size, can be operated with a low energy input, can be favourably sensed by touching, and has a high resolution display surface.
  • Another aim was that besides displaying written texts, the device should also be suitable for displaying pictures that can be favourably sensed by the visually impaired by touching.
  • the displaying device - similarly to touch- screens - should also function as an interactive input unit.
  • the invention was based on the recognition that if membrane members that have appropriate mechanical characteristics and are suitable for flexible deformation are attached to a carrier that can be regarded rigid in such a way that the space between the carrier and the membrane member - isolated from the environment with gastight sealing - is tilled with a medium using a novel method other than the ordinary, practically with the help of a pressure difference, but controlled by one single pressure source, and the same' medium is removed from this space in such a way that depending on the control of the membrane member realized by a suitably constructed electrostatic fixation, is unable to move, then with the help of several such membrane members arranged next to each other an optional picture can be displayed in a simple way and with a low energy input depending on whether the individual membrane members could move or not, and in accordance with this, as a result of the different extents to which the individual membrane members protrude from the basic plane, a graphical picture can be created that can be sensed in space by touching, as a result of which the task can be solved.
  • the tactile signalling device especially for providing picture and graphical information for the visually impaired, - which contains a carrying body, movable signalling elements arranged on the carrying body, and the signalling elements are com ected to a drive unit for moving the signalling elements, - is constructed in such a way that medium channels are arranged in the carrying body, and the access-opening of at least some of the medium channels comes out onto the surface of the carrying body in the environment of the signalling elements
  • the drive unit has a source unit for muving gas and/or liquid driving medium in the medium channels, where the regulator opening of the source unit is connected to at least some of the medium channels directly or indirectly via a transfer-passage in a way allowing flow of the medium, and at least some of the signalling elements are formed by membrane members made of a flexible material, at least some of the membrane members are attached to the surface of the carrying body with gastight sealing, while movement regulator bodies are inserted between the membrane members and the carrying body, where the individual movement regulator bodies have
  • a further characteristic of the signalling device according to the invention may be that at least a part of the second conducting layer at least partly surrounds the access-opening of the medium channel coming out onto the surface of the carrying body.
  • the membrane members are arranged on a membrane body consisting of one single material, and the individual membrane members are attached to the carrying body with independent gastight sealing, separated from the other membrane members.
  • the second conducting layer situated on the surface of the carrying body allocated to the individual membrane members and/or in its environment is divided into a lead-through member and an intervention member separated from it. At least some of the lead-through members that belong to the second conducting layer situated on the surface of the carrying body allocated to the individual membrane members and/or in its environment form a network in which they are connected to each other in an electrically conducting way.
  • the membrane members forming the signalling elements are arranged next to each other in rows situated at a permanent distance from each other and in columns separated from each other by permanent spacing, e.g. in a matrix arrangement, and they are connected to the carrying body-.
  • the carrying body is supplemented with a supporting member, in the supporting member there are guiding cavities, movement transfer pieces are inserted in at least some of the guiding cavities in a movable way, and at least some of the movement transfer pieces are connected to the membrane members of the signalling elements.
  • the drive unit is supplemented with a tank for storing the driving medium, and the ank is connected to the source unit in a way allowing material flow.
  • the material of the carrying body contains a polymer or ceramic component, or in a given case it is made of a polymer- ceramic composite.
  • the tactile signalling device has numerous favourable characteristics. The most important one of these is that due to its membrane-carrying structure of a specific construction and linking, and due to the novel combination of pneumatic electric signal control other than the ordinary, a signalling device can be created, which is much thinner than the known solution, and in the case of which, in spite of it being thin, the emerging height of the membrane members can be as much as 1 mm in a given case.
  • a further advantage is that as a result of the novel construction, due to the optional auxiliary pressure the force raising the membrane member from the basic plane can be adjusted thus the hardness of the membrane sensed by the user when touching the signalling points, and in this way the characteristics of the signalling device can be adjusted to suit the given user the best, which facilitates the safe use of the signalling device.
  • Another significant advantage which is also due to the structural arrangement is that especially in the case of larger display surfaces the signalling device can be manufactured at a much more favourable cost than the known solutions.
  • Another advantage deriving from the structural arrangement and the mode of operation is that due to the electrostatic movement regulator bodies it is much simpler to control the lifting of the individual membrane members than in the case of the known versions, because it is not the independent pressure change exerted on the individual membrane member that moves the membrane members - as the pressure change occurs at the same time on all membrane members but the tension exerted on the given electrostatic movement regulator body, as a result of which the movement of the individual membrane members by pressure is either allowed or hindered by the movement regulator body.
  • the signalling device has an electronic tactile display unit constructed with a significantly cheaper technology than the presently known similar solutions, which, apart from texts written in Braille, can also make figures, such as illustrations, maps, graphic images tactile with raised points, accessible for the touch sense, which can be favourably sensed by visually impaired persons.
  • the surface of the display unit itself can be used as an interactive input device at the same time - similarly to touch-screens - on electronic user surfaces. All the above is realised with the invention.
  • a further advantage deriving from the above is that the signalling device according to the invention favourably facilitates the participation of the visually impaired in the traditional and on-line education system, and it increases the employment chances of visually impaired persons by making it possible for them to acquire knowledge based on seeing.
  • the solution according to the invention enables the "recoding" of flat images and information shown on graphic screens widely used today for displaying information, at a favourable price, by converting visible picture information into tactile information in space.
  • the construction of the carrying body and the drive unit for operating the membrane members of the membrane body forming the signalling element of the signalling device according to the invention results in greater operating safety and simpler operation, and the manufacturing costs are favourable even in the case of display units with a large surface.
  • FIG. 1 shows the view of a possible version of the signalling device according to the invention, partly in section,
  • figure 2 shows an enlarged part of the connection between the carrying body and the signalling element
  • figure 3 shows a part of the surface of the carrying body
  • figure 4 shows a part of the signalling element viewed from the internal side.
  • FIG. 1 shows a version of the signalling device according to the invention with a large signalling element 20 favourably of the size of a computer monitor.
  • the signalling device has a carrying body 10 and a signalling element 20 situated on and attached to the surface 1 1 of the carrying body 10.
  • the supporting member 90 contains movement transfer pieces 92 inside its guiding cavities 91. The movement transfer pieces 92 lean against the external side 22e of the membrane members 22 forming the membrane body 21 of the signalling element 20 opposite the internal side 22a.
  • the membrane members 22 are made of a material capable of flexible deformation, while the carrying body 10 is made of a more rigid materials, e.g. polymer, ceramic, maybe polymer-ceramic composite, or from a different material having an insulating surface.
  • the movement transfer pieces 92, and obviously the membrane members 22 situated below the individual movement transfer pieces 92 are arranged in the supporting member 90 or on the membrane body 21 of the signalling element 20 in an organised way.
  • the neighbouring membrane members 22 are arranged in straight rows separated from each other by a "T" distance, and the individual rows run parallel with respect to each other, spaced at an "O" distance from each other.
  • the carrying body 10 contains the medium channels 12 and the passages 13 linking them to form a single network.
  • the access-openings 12a of the individual medium channels 12 come out onto the surface 1 1 of the carrying body 10 below each membrane member 22, above which surface part there is the closed space part 22d of the given membrane member 22.
  • Each of the membrane members 22 constructed on the membrane body 21 forming the signalling element 20 and made of one single piece in this case is connected to the surface 11 of the carrying body 10 with a separate gastight sealing, and in this way a given membrane member 22 and the part of the carrying body 10 below the given membrane member 22 together surround the closed space part 22d, which is connected to the environment only and exclusively via the medium channel 12.
  • the passage 13 of the carrying body 10 is connected to the regulator opening 31a of the source unit 31 of the drive unit 30 in a way allowing flow.
  • the drive unit 30 is also connected to the tank 32.
  • the tank 32 may contain the driving medium 40, which can be gas or liquid. Obviously, if the driving medium 40 is air, there is no need for a tank 32.
  • the source unit 31 is a pneumatic cylinder, but obviously the source unit 31 can also have a different construction.
  • the main point is only that it should be able to provide appropriate medium flow for lifting out the selected membrane members 22 of the membrane body 21 of the signalling element 20 from the plane of the signalling element 20 and, if necessary, draw back the medium used for lifting from the closed space part 22d below the raised membrane members 22, or even generate a pressure drop, if necessary, in the closed space parts 22d between the carrying body 10 and the signalling element 20.
  • the signalling device also contains an electric energy source 70 and a control unit 80.
  • the task of the electric energy source 70 is to supply appropriate electric energy for the control unit 80 needed for operation, and, if necessary, for the drive unit 30 too.
  • the electric energy source 70 also supplies energy for the movement regulator body 50 shown in figure 2, which is at least partly inserted between the carrying body 10 and the membrane body 21 of the signalling element 20.
  • the construction and structure of the movement regulator body 50 itself can be seen more favourably in figure 2. It can be seen here that - in the case of this form of execution - the first conducting layer 22b forming apart of the movement regulator body 50 is situated on the internal side 22a of the membrane members 22 of the membrane body 21 forming the signalling element 20. The second conducting layer 14 forming another part of the movement regulator body 50 is situated on the surface 1 1 of the carrying body 10.
  • the second conducting layer 14 belonging to the movement regulator body 50 consists of patterns created from lead-through members 14b and intervention members 14c Several lead-through members 14b form one single electrically conductive pattern, while the intervention members 14c form independent patterns.
  • the task of the lead-tluough member 14b is to transfer electric current from the surface 1 1 of the carrying body 10 to the independent circular piece of the first conducting layer 22b situated on the internal side 22a of the membrane member 22 of the signalling unit 20.
  • the task of the intervention piece 14c is to hold the first conducting layer 2.2b situated on the internal side 22a of the given membrane member 22 - and also the membrane member - when it is switched on, with electrostatic force.
  • the intervention member 14c of the second conducting layer 14 is constructed as a circular ring surface surrounding the access-opening 12a of the medium channel 12. In this way, on the surface of the first conducting layer 22b of the membrane member 22 it can exert an evenly distributed electrostatic force onto the membrane members 22 of the membrane body 21 of the signalling element, when it needs to be retained on the surface 1 1 of the carrying body 10 against the pressure of the driving medium 40 pushing to flow in through the openings 12a of the medium channel 12.
  • Figure 4 shows the pattern of the first conducting layer 22b. It can be seen here that the membrane members 22 of the membrane body 21 of the signalling element 20 have a circular shaped first conducting layer 22b each, on their internal side 22a, separated from each other by the insulating material of the membrane body 21 , and the free surface 22c of the first conducting layer 22b can be partly provided with an insulating coating 60.
  • the insulating coating 60 is not situated on the free surface 22c of the first conducting layer 22b, but on the free surface 14a of the second conducting layer 14.
  • the membrane members 22 of the signalling element 20 made of a flexible material are constructed from one single membrane body 21. In the position shown in figure 2 the membrane member 22 on the left is raised, pushed up, while the membrane member 22 to its right is in resting position, let down.
  • the lead-through member 14b of the second conducting layer 14 of the movement regulator body 50 runs in the closed space part 22d of the membrane member 22 along the line where membrane member 22 joins the surface 1 1 of the carrying body 10, while the intervention member 14c of the second conducting layer 14 surrounds the access-opening 12a of the medium channel 12 coming out onto the surface 1 1 of the carrying body 10.
  • the first conducting layer 22b is also situated in the closed space part 22d and on the internal side 22a of the membrane member 22, and here it completely covers the internal side 22a of the membrane member 22. It can be seen here that when the membrane member 22 is in resting position, the first conducting layer 22b covering the internal side 22a of the membrane member 22 contacts the lead-through member 14b situated on the surface 11 of the carrying body 10, as a result of which electric energy can be transferred from the lead- through member 14b onto the first conducting layer 22b too.
  • the first conducting layer 22b of the membrane member 22 can be supplied with electric energy in a different way too.
  • the second conducting layer 14 does not need to have a lead-through member 14b, it only needs the intervention member 14c.
  • the arrangement of the movement regulator body 50 shown in figure 2 is favourable from the aspect of manufacturing technology and electric conduction.
  • the membrane members 22 can also be independent components that can be attached to the surface 11 of the carrying body 10 separately, for example with the help of a rigid structural element. However, membrane members 22 constructed from one single member body 21 are easier to mount on the surface 1 1 of the carrying body 10.
  • the signalling device according to the invention shown in the figures operates as described below.
  • the control unit 80 After entering the information to be displayed on the signalling element 20 of the signalling device, the control unit 80 processes the received information - with the help of a computer program not described here in detail and after converting the information, on the one hand it sends an instruction to the source unit 31 of the drive unit 30 to push the driving medium 40 through the pipe 33 and through the regulator opening 3 1a into the passage 13 of the carrying body 10, from where it is forwarded to the medium channels 12 and at the access-opening 12a of the medium channel 12 it appears on the internal side 22a of each membrane member 22. On the other hand, it forwards the electric current of the electric energy source 70 to the first conducting layers 22b situated on the selected membrane members 22 of the signalling element 20 and to the second conducting layers 14 situated on the surface 11 of the carrying body 10.
  • the electrostatic tension generated by the electric current because of the assistance of the insulating coating 60 between the first conducting layer 22b of the selected membrane member 22 and the intervention member 14c belonging to the given membrane member 22 but situated on the surface 1 1 of the carrying body keeps the given membrane member 22 or membrane members 22 pressed down on the surface 1 1 of the carrying body 10.
  • the membrane members 22 onto the first conducting layer 22b of which no tension was exerted and/or onto the intervention member 14c of the second conducting layer 14 that belongs to them no tension was exerted do not remain stuck to the surface 1 1 of the carrying body 10.
  • the driving medium 40 flowing through the medium channel 12 gets into the closed space part 22d surrounded by the internal side 22a of the membrane member 22 that remained free and by the surface 1 1 of the carrying body 10 through the opening 12a of the medium channel, and it forces the flexible membrane member 22 to become deformed and pushes it out from the surface 11 of the carrying body 10.
  • This process takes place in the case of each membrane member 22 of the signalling element 20, as a result of which some of the membrane members 22 emerge from the surface 1 1 of the carrying body 10 and some of them remain there, creating by this a pattern in space, which contains tactile information.
  • the control unit 80 switches over the source unit 31 of the drive unit 30, which now pulls out the driving medium 40 from the closed space part 22d of the membrane members 22 that remain free.
  • the source unit 31 of the drive unit 30 creates a small vacuum in the closed space part 22d of the membrane members 22 that remain free in ol der to pull back deformable membrane members 22 into their rest position, that is onto the surface 1 1 of the carrying body 10.
  • the protrusions of the membrane body 21 of the signalling element 20 disappear and the following information to be displayed can be entered into the control unit 80. Obviously, in this position of the signalling element 20 there is no need for tension either on the first conducting layer 22b or on the second conducting layer 14.
  • the signalling device according to the invention can be favourably used in cases when visual information in plane needs to be displayed in a tactile form in space, especially when such visual information needs to be provided for visually impaired persons.

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  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
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Abstract

The invention relates to a tactile signalling device, especially for providing picture and graphical information for the visually impaired, which contains a carrying body (10), movable signalling elements (20) arranged on the carrying body (10), and the signalling elements (20) are connected to a drive unit (30) for moving the signalling elements (20). The characteristic feature of the invention is that medium channels (12) are arranged in the carrying body (10), and the access-opening (12a) of at least some of the medium channels (12) comes out onto the surface (11) of the carrying body (10) in the environment of the signalling elements (20), the drive unit (30) has a source unit (31) for moving gas and/or liquid driving medium (40) in the medium channels (12), where the regulator opening (31a) of the source unit (31) is connected to at least some of the medium channels (12) directly or indirectly via a transfer-passage (13) in a way allowing flow, and at least some of the signalling elements (20) are formed by membrane members (22) made of a flexible material, at least some of the membrane members (22) are attached to the surface (11) of the carrying body (10) with gastight sealing, while movement regulator bodies (50) are inserted between the membrane members (22) and the carrying body (10), where the individual movement regulator bodies (50) have a first conducting layer (22b) situated on the internal side (22a) of the membrane members (22) facing the carrying body (10) and/or in its environment, and a second conducting layer (14) placed on the surface (11) of the carrying body (10) facing the membrane members (22) and/or in its environment, and on a part of the free surface (22c) of the first conducting layer (22b) and/or on a part of the free surface (14a) of the second conducting layer (14) there is an insulating coating (60), and the first conducting layer (22b) and/or the second conducting layer (14) is connected to an electric energy source (70), and the electric energy source (70), the drive unit (30) and the movement regulator bodies (50) are connected to the control unit (80).

Description

Tactile signalling device, especially for providing picture and graphical information for the visually impaired
The invention relates to a tactile signalling device, especially for providing picture and graphical information for the visually impaired, which contains a carrying body, movable signalling elements arranged on the carrying body, and the signalling elements are connected to a drive unit for moving the signalling elements.
Numerous assistive devices have been developed for the visually impaired to enable them to more or less to compensate the lack of visually sensing picture information that can be seen, such as the size and position of the ground objects of the environment, or other figures, texts, etc.
Recently it has become especially important to provide a solution with the help of which visually impaired persons can be provided with textual and graphical information in a simple way. Publication document no US 2005/0131490 describes a MEMS device, which contains light-pressure transducers that can be fitted to the retina of the eye, and a membrane capable of deformation. Depending on the intensity of the perceived light the device is able to exert a pressure on the retina, as a result of which it can be suitable for creating a picture in the visually impaired user's brain.
However, the disadvantage of the solution is that the incorporation of the device requires a complicated and expensive surgical intervention, which makes it available only for a few people.
A further disadvantage is that it can only be used in the case of certain visually impaired persons, which restricts the possibility of wide use even further.
The devices developed for wide usability are based on that they contain a tactile display unit, on the tactile surface of which there are surface parts that can be moved independently from each other. These surface parts can be lifted out from the entire display surface with the hel of some mechanism, and so visually impaired persons are able to sense the picture with the help of this mechanical converting surface, by touching. Such devices are described for example in the lecture by Makoto Takamiya - Tsuyoshi Sekitani - Yusaku Kato - Hiroshi Kawaguchi - Takao Someya - Takayasu Sakurai entitled "An Organic FET SRAM for Braille Sheet Display with Back Gate to Increase Static Noise Margin" (2006 IEEE International Solid-State Circuits Conference; ISSCC 2006/session 156 organic devices and circuits/ 15.4), and in the essay by Akio Yamamoto - Shuichi Nagasawa - Hiroaki Yamamoto - Toshiro Higuchi entitled "Electrostatic Tactile Display with Thin Film Slider and Its Application to Tactile Telepresentation Systems" (IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS, VOL. 12, NO. 2, MARCH/APRIL 2006).
However, the disadvantage of these known solutions is that because of their structural construction they are expensive to manufacture, they are space demanding and they have a large electric energy consumption, which makes their operation more difficult too, which significantly restricts the possibility of wide use.
Our aim with the solution according to the invention is to overcome the deficiencies of such known tactile display devices and to create a version, which, due to its simple structural construction can be manufactured at a favourable cost even in a large size, can be operated with a low energy input, can be favourably sensed by touching, and has a high resolution display surface. Another aim was that besides displaying written texts, the device should also be suitable for displaying pictures that can be favourably sensed by the visually impaired by touching. Furthermore, the displaying device - similarly to touch- screens - should also function as an interactive input unit.
The invention was based on the recognition that if membrane members that have appropriate mechanical characteristics and are suitable for flexible deformation are attached to a carrier that can be regarded rigid in such a way that the space between the carrier and the membrane member - isolated from the environment with gastight sealing - is tilled with a medium using a novel method other than the ordinary, practically with the help of a pressure difference, but controlled by one single pressure source, and the same' medium is removed from this space in such a way that depending on the control of the membrane member realized by a suitably constructed electrostatic fixation, is unable to move, then with the help of several such membrane members arranged next to each other an optional picture can be displayed in a simple way and with a low energy input depending on whether the individual membrane members could move or not, and in accordance with this, as a result of the different extents to which the individual membrane members protrude from the basic plane, a graphical picture can be created that can be sensed in space by touching, as a result of which the task can be solved.
In accordance with the set aim, the tactile signalling device according to the invention, especially for providing picture and graphical information for the visually impaired, - which contains a carrying body, movable signalling elements arranged on the carrying body, and the signalling elements are com ected to a drive unit for moving the signalling elements, - is constructed in such a way that medium channels are arranged in the carrying body, and the access-opening of at least some of the medium channels comes out onto the surface of the carrying body in the environment of the signalling elements, the drive unit has a source unit for muving gas and/or liquid driving medium in the medium channels, where the regulator opening of the source unit is connected to at least some of the medium channels directly or indirectly via a transfer-passage in a way allowing flow of the medium, and at least some of the signalling elements are formed by membrane members made of a flexible material, at least some of the membrane members are attached to the surface of the carrying body with gastight sealing, while movement regulator bodies are inserted between the membrane members and the carrying body, where the individual movement regulator bodies have a first conducting layer situated on the internal side of the membrane members facing the carrying body and/or in its environment, and a second conducting layer placed on the surface of the carrying body facing the membrane members and/or in its environment, and on a part of the free surface of the first conducting layer and/or on a part of the free surface of the second conducting layer there is an insulating coating, and the first conducting layer and/or the second conducting layer is connected to an electric energy source, and the electric energy source, the drive unit and the movement regulator bodies are connected to the control unit.
A further characteristic of the signalling device according to the invention may be that at least a part of the second conducting layer at least partly surrounds the access-opening of the medium channel coming out onto the surface of the carrying body. In the case of another version of the signalling device the membrane members are arranged on a membrane body consisting of one single material, and the individual membrane members are attached to the carrying body with independent gastight sealing, separated from the other membrane members.
In the case of an even further different construction of the invention, the second conducting layer situated on the surface of the carrying body allocated to the individual membrane members and/or in its environment is divided into a lead-through member and an intervention member separated from it. At least some of the lead-through members that belong to the second conducting layer situated on the surface of the carrying body allocated to the individual membrane members and/or in its environment form a network in which they are connected to each other in an electrically conducting way.
In the case of a favourable design variant of the signalling device the membrane members forming the signalling elements are arranged next to each other in rows situated at a permanent distance from each other and in columns separated from each other by permanent spacing, e.g. in a matrix arrangement, and they are connected to the carrying body-.
From the aspect of the invention it may be favourable, if the medium channels form together one single continuous network.
In the case of another different design variant of execution of the signalling device the carrying body is supplemented with a supporting member, in the supporting member there are guiding cavities, movement transfer pieces are inserted in at least some of the guiding cavities in a movable way, and at least some of the movement transfer pieces are connected to the membrane members of the signalling elements.
In the case of a further design variant of execution of the invention the drive unit is supplemented with a tank for storing the driving medium, and the ank is connected to the source unit in a way allowing material flow. in the case of an even different version of the invention the material of the carrying body contains a polymer or ceramic component, or in a given case it is made of a polymer- ceramic composite.
The tactile signalling device according to the invention has numerous favourable characteristics. The most important one of these is that due to its membrane-carrying structure of a specific construction and linking, and due to the novel combination of pneumatic electric signal control other than the ordinary, a signalling device can be created, which is much thinner than the known solution, and in the case of which, in spite of it being thin, the emerging height of the membrane members can be as much as 1 mm in a given case.
A further advantage is that as a result of the novel construction, due to the optional auxiliary pressure the force raising the membrane member from the basic plane can be adjusted thus the hardness of the membrane sensed by the user when touching the signalling points, and in this way the characteristics of the signalling device can be adjusted to suit the given user the best, which facilitates the safe use of the signalling device.
Another significant advantage which is also due to the structural arrangement is that especially in the case of larger display surfaces the signalling device can be manufactured at a much more favourable cost than the known solutions.
Another advantage deriving from the structural arrangement and the mode of operation is that due to the electrostatic movement regulator bodies it is much simpler to control the lifting of the individual membrane members than in the case of the known versions, because it is not the independent pressure change exerted on the individual membrane member that moves the membrane members - as the pressure change occurs at the same time on all membrane members but the tension exerted on the given electrostatic movement regulator body, as a result of which the movement of the individual membrane members by pressure is either allowed or hindered by the movement regulator body.
It must also be regarded as an advantage that the signalling device according to the invention has an electronic tactile display unit constructed with a significantly cheaper technology than the presently known similar solutions, which, apart from texts written in Braille, can also make figures, such as illustrations, maps, graphic images tactile with raised points, accessible for the touch sense, which can be favourably sensed by visually impaired persons. Furthermore, the surface of the display unit itself can be used as an interactive input device at the same time - similarly to touch-screens - on electronic user surfaces. All the above is realised with the invention.
A further advantage deriving from the above is that the signalling device according to the invention favourably facilitates the participation of the visually impaired in the traditional and on-line education system, and it increases the employment chances of visually impaired persons by making it possible for them to acquire knowledge based on seeing. The solution according to the invention enables the "recoding" of flat images and information shown on graphic screens widely used today for displaying information, at a favourable price, by converting visible picture information into tactile information in space.
It is also favourable that the construction of the carrying body and the drive unit for operating the membrane members of the membrane body forming the signalling element of the signalling device according to the invention results in greater operating safety and simpler operation, and the manufacturing costs are favourable even in the case of display units with a large surface.
Below the signalling device according to the invention is described in greater detail in connection with a construction example, on the basis of drawings. In the drawings figure 1 shows the view of a possible version of the signalling device according to the invention, partly in section,
figure 2 shows an enlarged part of the connection between the carrying body and the signalling element,
figure 3 shows a part of the surface of the carrying body,
figure 4 shows a part of the signalling element viewed from the internal side.
Figure 1 shows a version of the signalling device according to the invention with a large signalling element 20 favourably of the size of a computer monitor. It can be seen that the signalling device has a carrying body 10 and a signalling element 20 situated on and attached to the surface 1 1 of the carrying body 10. In the case of this form of execution there is also a supporting member 90 on the side of the signalling element 20 opposite the carrying body 10, and the supporting member 90 contains movement transfer pieces 92 inside its guiding cavities 91. The movement transfer pieces 92 lean against the external side 22e of the membrane members 22 forming the membrane body 21 of the signalling element 20 opposite the internal side 22a.
The membrane members 22 are made of a material capable of flexible deformation, while the carrying body 10 is made of a more rigid materials, e.g. polymer, ceramic, maybe polymer-ceramic composite, or from a different material having an insulating surface.
The movement transfer pieces 92, and obviously the membrane members 22 situated below the individual movement transfer pieces 92 are arranged in the supporting member 90 or on the membrane body 21 of the signalling element 20 in an organised way. In this case it means that the neighbouring membrane members 22 are arranged in straight rows separated from each other by a "T" distance, and the individual rows run parallel with respect to each other, spaced at an "O" distance from each other.
In the present case the carrying body 10 contains the medium channels 12 and the passages 13 linking them to form a single network. The access-openings 12a of the individual medium channels 12 come out onto the surface 1 1 of the carrying body 10 below each membrane member 22, above which surface part there is the closed space part 22d of the given membrane member 22. Each of the membrane members 22 constructed on the membrane body 21 forming the signalling element 20 and made of one single piece in this case is connected to the surface 11 of the carrying body 10 with a separate gastight sealing, and in this way a given membrane member 22 and the part of the carrying body 10 below the given membrane member 22 together surround the closed space part 22d, which is connected to the environment only and exclusively via the medium channel 12.
It can also be seen in figure 1 that here the passage 13 of the carrying body 10 is connected to the regulator opening 31a of the source unit 31 of the drive unit 30 in a way allowing flow. In the present case the drive unit 30 is also connected to the tank 32. The tank 32 may contain the driving medium 40, which can be gas or liquid. Obviously, if the driving medium 40 is air, there is no need for a tank 32. In the case of the present form of execution the source unit 31 is a pneumatic cylinder, but obviously the source unit 31 can also have a different construction. The main point is only that it should be able to provide appropriate medium flow for lifting out the selected membrane members 22 of the membrane body 21 of the signalling element 20 from the plane of the signalling element 20 and, if necessary, draw back the medium used for lifting from the closed space part 22d below the raised membrane members 22, or even generate a pressure drop, if necessary, in the closed space parts 22d between the carrying body 10 and the signalling element 20.
The signalling device also contains an electric energy source 70 and a control unit 80. The task of the electric energy source 70 is to supply appropriate electric energy for the control unit 80 needed for operation, and, if necessary, for the drive unit 30 too.
The electric energy source 70 also supplies energy for the movement regulator body 50 shown in figure 2, which is at least partly inserted between the carrying body 10 and the membrane body 21 of the signalling element 20.
The construction and structure of the movement regulator body 50 itself can be seen more favourably in figure 2. It can be seen here that - in the case of this form of execution - the first conducting layer 22b forming apart of the movement regulator body 50 is situated on the internal side 22a of the membrane members 22 of the membrane body 21 forming the signalling element 20. The second conducting layer 14 forming another part of the movement regulator body 50 is situated on the surface 1 1 of the carrying body 10.
As it is shown in figure 3, the second conducting layer 14 belonging to the movement regulator body 50 consists of patterns created from lead-through members 14b and intervention members 14c Several lead-through members 14b form one single electrically conductive pattern, while the intervention members 14c form independent patterns. The task of the lead-tluough member 14b is to transfer electric current from the surface 1 1 of the carrying body 10 to the independent circular piece of the first conducting layer 22b situated on the internal side 22a of the membrane member 22 of the signalling unit 20. As opposed to this, the task of the intervention piece 14c is to hold the first conducting layer 2.2b situated on the internal side 22a of the given membrane member 22 - and also the membrane member - when it is switched on, with electrostatic force. On the free surface 14a of the intervention member 14c of the second conducting layer 14 there is an insulating coating.60. in order to retain the membrane member 22 in its initial position efficiently, the intervention member 14c of the second conducting layer 14 is constructed as a circular ring surface surrounding the access-opening 12a of the medium channel 12. In this way, on the surface of the first conducting layer 22b of the membrane member 22 it can exert an evenly distributed electrostatic force onto the membrane members 22 of the membrane body 21 of the signalling element, when it needs to be retained on the surface 1 1 of the carrying body 10 against the pressure of the driving medium 40 pushing to flow in through the openings 12a of the medium channel 12.
Figure 4 shows the pattern of the first conducting layer 22b. It can be seen here that the membrane members 22 of the membrane body 21 of the signalling element 20 have a circular shaped first conducting layer 22b each, on their internal side 22a, separated from each other by the insulating material of the membrane body 21 , and the free surface 22c of the first conducting layer 22b can be partly provided with an insulating coating 60.
However, in the case shown in figure 2 the insulating coating 60 is not situated on the free surface 22c of the first conducting layer 22b, but on the free surface 14a of the second conducting layer 14.
On returning to figure 2, we can see the individual membrane members 22 of the membrane body 21 of the signalling element 20 and the carrying body 10 situated in its environment, and the position of the first conducting layer 22b and second conducting layer 14 situated between them, belonging to the movement regulator body 50, with respect to each other. Here the membrane members 22 of the signalling element 20 made of a flexible material are constructed from one single membrane body 21. In the position shown in figure 2 the membrane member 22 on the left is raised, pushed up, while the membrane member 22 to its right is in resting position, let down. la the case of this design variant of execution of the signalling device according to the invention the lead-through member 14b of the second conducting layer 14 of the movement regulator body 50 runs in the closed space part 22d of the membrane member 22 along the line where membrane member 22 joins the surface 1 1 of the carrying body 10, while the intervention member 14c of the second conducting layer 14 surrounds the access-opening 12a of the medium channel 12 coming out onto the surface 1 1 of the carrying body 10. On the free surface 14a of the intervention member 14c there is an insulating coating 60.
The first conducting layer 22b is also situated in the closed space part 22d and on the internal side 22a of the membrane member 22, and here it completely covers the internal side 22a of the membrane member 22. It can be seen here that when the membrane member 22 is in resting position, the first conducting layer 22b covering the internal side 22a of the membrane member 22 contacts the lead-through member 14b situated on the surface 11 of the carrying body 10, as a result of which electric energy can be transferred from the lead- through member 14b onto the first conducting layer 22b too.
It must be pointed out here that the first conducting layer 22b of the membrane member 22 can be supplied with electric energy in a different way too. In this case the second conducting layer 14 does not need to have a lead-through member 14b, it only needs the intervention member 14c. However, the arrangement of the movement regulator body 50 shown in figure 2 is favourable from the aspect of manufacturing technology and electric conduction.
It is important to emphasise that it is not compulsory to construct the signalling element 20 from one single membrane body 21. The membrane members 22 can also be independent components that can be attached to the surface 11 of the carrying body 10 separately, for example with the help of a rigid structural element. However, membrane members 22 constructed from one single member body 21 are easier to mount on the surface 1 1 of the carrying body 10.
The signalling device according to the invention shown in the figures operates as described below. After entering the information to be displayed on the signalling element 20 of the signalling device, the control unit 80 processes the received information - with the help of a computer program not described here in detail and after converting the information, on the one hand it sends an instruction to the source unit 31 of the drive unit 30 to push the driving medium 40 through the pipe 33 and through the regulator opening 3 1a into the passage 13 of the carrying body 10, from where it is forwarded to the medium channels 12 and at the access-opening 12a of the medium channel 12 it appears on the internal side 22a of each membrane member 22. On the other hand, it forwards the electric current of the electric energy source 70 to the first conducting layers 22b situated on the selected membrane members 22 of the signalling element 20 and to the second conducting layers 14 situated on the surface 11 of the carrying body 10.
The electrostatic tension generated by the electric current because of the assistance of the insulating coating 60 between the first conducting layer 22b of the selected membrane member 22 and the intervention member 14c belonging to the given membrane member 22 but situated on the surface 1 1 of the carrying body keeps the given membrane member 22 or membrane members 22 pressed down on the surface 1 1 of the carrying body 10. As opposed to this, the membrane members 22 onto the first conducting layer 22b of which no tension was exerted and/or onto the intervention member 14c of the second conducting layer 14 that belongs to them no tension was exerted do not remain stuck to the surface 1 1 of the carrying body 10. As a result of this, the driving medium 40 flowing through the medium channel 12 gets into the closed space part 22d surrounded by the internal side 22a of the membrane member 22 that remained free and by the surface 1 1 of the carrying body 10 through the opening 12a of the medium channel, and it forces the flexible membrane member 22 to become deformed and pushes it out from the surface 11 of the carrying body 10. This process takes place in the case of each membrane member 22 of the signalling element 20, as a result of which some of the membrane members 22 emerge from the surface 1 1 of the carrying body 10 and some of them remain there, creating by this a pattern in space, which contains tactile information.
After the person using the signalling device has felt the entire surface of the signalling element 20 and by this obtained all the information displayed, on the basis of another command the control unit 80 switches over the source unit 31 of the drive unit 30, which now pulls out the driving medium 40 from the closed space part 22d of the membrane members 22 that remain free. Practically the source unit 31 of the drive unit 30 creates a small vacuum in the closed space part 22d of the membrane members 22 that remain free in ol der to pull back deformable membrane members 22 into their rest position, that is onto the surface 1 1 of the carrying body 10. At this point the protrusions of the membrane body 21 of the signalling element 20 disappear and the following information to be displayed can be entered into the control unit 80. Obviously, in this position of the signalling element 20 there is no need for tension either on the first conducting layer 22b or on the second conducting layer 14.
The signalling device according to the invention can be favourably used in cases when visual information in plane needs to be displayed in a tactile form in space, especially when such visual information needs to be provided for visually impaired persons.
List of references 0 carrying body 11 surface
12 medium channel 12a access-opening
13 transfer-passage
14 second conducting layer 14a free surface
14b lead-through member 14c intervention member 0 signalling element 21 membrane body
22 membrane member
22a internal side
22b first conducting layer
22c free surface
22d closed space part
22e external side 0 drive unit 31 source unit
3 la regulator opening
32 tank
33 pipe 0 driving medium 0 movement regulator body 0 insulating coating 0 electric energy source
80 control unit
90 supporting member 91 guiding cavity
92 movement transfer piece
"O" spacing "T" distance

Claims

1. Tactile signalling device, especially for providing picture and graphical information for the visually impaired, which contains a carrying body (10), movable signalling elements (20) arranged on the carrying body (10), and the signalling elements (20) are connected to a drive unit (30) for moving the signalling elements (20), characterised by that medium channels (12) are arranged in the carrying body (10), and the access-opening (12a) of at least some of the medium channels (12) comes out onto the surface (1 1) of the carrying body (10) in the environment of the signalling elements (20), the drive unit (30) has a source unit (31 ) for moving gas and/or liquid driving medium (40) in the medium channels ( 12). where the regulator opening (3 la) of the source unit (31) is connected to at least some of the medium channels (12) directly or indirectly via a transfer-passage (13) in a way allowing flow, and at least some of the signalling elements (20) are formed by membrane members (22) made of a flexible material, at least some of the membrane members (22) are attached to the surface (1 1) of the carrying body (10) with gastight sealing, while movement regulator bodies (50) are inserted between the membrane members (22) and the carrying body (10), where the individual movement regulator bodies (50) have a first conducting layer (22b) situated on the internal side (22a) of the membrane members (22) facing the carrying body (10) and/or in its environment, and a second conducting layer (14) placed on the surface (11) of the carrying body (10) facing the membrane members (22) and/or in its environment, and on a part of the free surface (22c) of the first conducting layer (22b) and/or on a pail of the free surface (14a) of the second conducting layer (14) there is an insulating coating (60), and the first conducting layer (22b) and/or the second conducting layer ( 14) is connected to an electric energy source (70), and the electric energy source (70), the drive unit (30) and the movement regulator bodies (50) are connected to the control unit (80).
2. Signalling device as in claim 1 , characterised by that at least a part of the second conducting layer (14) at least partly surrounds the access-opening (12a) of the medium channel (12) coming out onto the surface (1 1) of the carrying body (10).
3. Signalling device as in claim 1 or 2, characterised by that the membrane members (22) are arranged on a membrane body (21) consisting of one single material, and the individual membrane members (22) are attached to the carrying body (10) with independent gastight sealing, separated from the other membrane members (22).
4. Signalling device as in any of claims 1-3, characterised by that the second conducting layer ( 14) situated on the surface (11) of the carrying body (10) allocated to the individual membrane members (22) and/or in its environment is divided into a lead- through member (14b) and an intervention member (14c) separated from it.
5. Signalling device as in claim 4, characterised by that at least some of the lead- through members (14b) that belong to the second conducting layer (14) situated on the surface (11 ) of the carrying body (10) allocated to the individual membrane members (22) and/or in its environment form a network in which they are connected to each other in an electrically conducting way.
6. Signalling device as in any of claims 1-5, characterised by that the membrane members (22) forming the signalling elements (20) are arranged next to each other in rows situated at a permanent distance (T) from each other and in columns separated from each other by permanent spacing (O), e.g. in a matrix arrangement, and they are connected to the carrying body (10).
7. Signalling device as in any of claims 1-6, characterised by that the medium channels ( 12) together form one single continuous network.
8. Signalling device as in any of claims 1-7, characterised by that the carrying body ( 10) is supplemented with a supporting member (90), in the supporting member (90) there are gui ding cavities (91), movement transfer pieces (92) are inserted in at least some of the guiding cavities (91) in a movable way, and at least some of the movement transfer pieces (92) are connected to the membrane members (22) of the signalling elements (20).
9. Signalling device as in any of claims 1-8, characterised by that the drive unit (30) is supplemented with a tank (32) for storing the driving medium (40), and the tank (32) is connected to the source unit (31 ) in a way allowing material flow.
10. Signalling device as in any of claims 1-9, characterised by that the material of the carrying body (10) contains a polymer component.
1 1. Signalling device as in any of claims 1-10, characterised by that the material of the carrying body (10) contains a ceramic component.
PCT/IB2012/002990 2011-10-28 2012-10-26 Tactile signalling device, especially for providing picture and graphical information for the visually impaired WO2013061168A2 (en)

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HU1100601A HUP1100601A2 (en) 2011-10-28 2011-10-28 Signalling device sensible by touch for providing image or graphic information especially for visually handicapper persons
HUHUP1100601 2011-10-28

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