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CN-122029584-A - Portable reading device for blind person

CN122029584ACN 122029584 ACN122029584 ACN 122029584ACN-122029584-A

Abstract

The invention relates to a portable reading device (1) for blind people, comprising a finger receptacle (3), a haptic output module (10) arranged on the finger receptacle (3) which produces tactilely perceptible characters and/or symbols on a touch surface (12), and an evaluation and control unit (19) which converts text to be output into such tactilely perceptible characters and/or symbols and controls the haptic output module (10) accordingly, wherein the haptic output module (10) comprises a plurality of movable pins (13) which are each coupled to a piston cylinder unit (14), a storage container (17) and a plurality of magnetohydrodynamic pump modules (20), wherein the piston cylinder unit (14) is in fluid connection with the storage container (17) by means of at least one associated magnetohydrodynamic pump module (20) and a channel (16), wherein the magnetohydrodynamic pump modules (20) are each implemented for pumping a conductive medium (18) from the storage container (17) into the corresponding piston cylinder unit (14) by means of the channel (16) and moving the corresponding movable pins (14) from a starting position to an ending position, or pumping the conductive medium (18) from the respective piston cylinder unit (14) into the reservoir (17) through the channel (16) and moving the respective movable pin (14) from the end position to the start position.

Inventors

  • K. A. Hanniklee
  • V. Cochrake
  • M. Astner
  • R. A. Klein
  • U. Schultz

Assignees

  • 罗伯特·博世有限公司

Dates

Publication Date
20260512
Application Date
20241008
Priority Date
20231020

Claims (15)

  1. 1. A portable reading device (1) for blind people, comprising a reading area, a haptic output module (10) arranged in the reading area, which is designed to produce a tactilely perceptible character and/or symbol on a touch surface (12), and an evaluation and control unit (19) which is designed to convert text to be output into such tactilely perceptible character and/or symbol and to control the haptic output module (10) accordingly, wherein the haptic output module (10) comprises a plurality of pins (13) which are each coupled to a piston cylinder unit (14) and are movable between a starting position and an end position, at least one reservoir (17) which stores an electrically conductive medium (18), and a plurality of magnetohydrodynamic pump modules (20) which are each assigned to one of the movable pins (13) and to a corresponding piston cylinder unit (14), wherein the piston cylinder unit (14) is each connected to a common container (17) or to one of the plurality of containers (17) by way of at least one assigned magnetohydrodynamic pump module (20) and a channel (16), wherein the respective reservoir (18) is designed to be connected to the respective fluid pump unit (14) by way of the respective reservoir (17), and moving the corresponding movable pin (14) from the starting position to the end position, or pumping the conductive medium (18) from the corresponding piston cylinder unit (14) into the respectively connected storage container (17) through the respectively assigned channel (16), and moving the corresponding movable pin (14) from the end position to the starting position.
  2. 2. Portable reading device (1) according to claim 1, characterized in that a finger receptacle (3) is arranged in the reading area such that a finger (9) can be introduced and the tactile output assembly (10) can be touched by the introduced finger.
  3. 3. Portable reading device (1) according to claim 1 or 2, characterized in that the plurality of magnetohydrodynamic pump modules (20) each comprise an electrode device (24) generating an electric current and a magnet device (26) generating a magnetic field, wherein lorentz forces are generated by the electric current and the magnetic field, which lorentz forces accelerate the electrically conductive medium (18) in the corresponding channel section.
  4. 4. A portable reading device (1) according to any one of claims 1 to 3, characterized in that six movable pins (13) are arranged in a matrix of two columns and three rows in the area of the touch surface (12) and are determined for producing the tactilely perceptible character and/or symbol in braille on the touch surface (12).
  5. 5. Portable reading device (1) according to any one of claims 1 to 4, characterized in that a communication interface (5) is provided, which is implemented for establishing a communication connection (6) with a mobile terminal device (7), which is implemented for transmitting text to be output to the evaluation and control unit (19) via the communication connection (6).
  6. 6. Portable reading device (1) according to any one of claims 2 to 5, characterized in that at least one elastic cushion (4) is arranged inside the finger receptacle (3), which is implemented for adapting an effective internal cross section to a finger (9) introduced into the finger receptacle (3), wherein the at least one elastic cushion (4) can be filled with an electrically conductive medium (18) or emptied by means of at least one magnetohydrodynamic pump module (20).
  7. 7. The portable reading device (1) according to any one of claims 1 to 6, characterized in that the tactile output assembly (10) is further implemented for recognizing a manual input, which can be achieved by a finger (9) by pressing onto the touch surface (12) and the movable pin (13).
  8. 8. Portable reading device (1) according to claims 3 and 7, characterized in that the plurality of magnetohydrodynamic pump modules (20) each function as a sensor module, wherein the electrode means (24) intercept an induced voltage on the corresponding channel section, which is generated by the interaction of the volume flow of the electrically conductive medium (5) generated by the manual input with the generated magnetic field of the magnet means (26) and which can be evaluated by the evaluation and control unit (19).
  9. 9. Portable reading device (1) according to any one of claims 1 to 8, characterized in that an optical sensor device (30) is arranged on the tactile output assembly (10) and is implemented for detecting printed text and transmitting the printed text as text to be output to the evaluation and control unit (19).
  10. 10. Portable reading device (1) according to claim 9, characterized in that the optical sensor device (30) detects the printed text when the reading device is moved over the printed character together with the tactile output assembly (10) and the optical sensor device (30), in particular by means of a finger (9) introduced into the finger receptacle (3), and the optical sensor device (30) is located just above the character.
  11. 11. Portable reading device (1) according to claim 10, characterized in that the evaluation and control unit (19) converts the detected characters into corresponding braille characters and outputs the braille characters through the movable pins (13) and the touch surface (12) of the tactile output assembly (10).
  12. 12. Portable reading device (1) according to claim 4 and 10 or 11, characterized in that above and below the matrix of movable pins (13), one movable pin (13) each embodied as a directional bar (15) is arranged in the area of the touch surface (12) and is determined for showing a guiding error of the optical sensor device (30).
  13. 13. Portable reading device (1) according to claim 12, characterized in that the movable pins (13) implemented as first orientation bars (15A) arranged above the matrix of movable pins (13) are movable from their starting position to their ending position when the optical sensor device (30) is deflected upwards during movement along the line of text, wherein the movable pins (13) implemented as second orientation bars (15B) arranged below the matrix of movable pins (13) are movable from their starting position to their ending position when the optical sensor device (30) is deflected downwards during movement along the line of text.
  14. 14. Portable reading device (1) according to any one of claims 2 to 8, characterized in that the touch surface (12) of the tactile output assembly (10) is arranged outside the finger receptacle (3) and is touchable by a further finger (9) which is not guided into the finger receptacle (3).
  15. 15. Portable reading device (1) according to any one of claims 2 to 14, characterized in that a line scanner (8) is arranged in the finger receptacle (3), which line scanner is implemented for capturing a fingerprint of the finger (9) when introduced into the finger receptacle (3).

Description

Portable reading device for blind person Technical Field The invention relates to a portable reading device for blind people. Background Magnetohydrodynamic (MHD) is a branched area of physics. It describes the behavior of a conductive fluid traversed by a magnetic and an electric field. In a narrow sense, magneto-dynamics relates to liquids, in particular plasmas, which are described as fluids in the context of MHD. Typical fields of application of magneto-mechanics are flow effects and flow measurements in metallurgy and semiconductor single crystal growth. From DE 10 2017 214 173 A1, a hydraulic actuator, a temperature control device, a sensor device and a hydraulic system for a hydraulic system filled with an electrically conductive medium are known, as well as a method for realizing a pressure increase in at least one partial volume of a hydraulic system filled with an electrically conductive medium, a method for controlling an electrically conductive medium in a hydraulic system and a method for acquiring information about the flow speed of an electrically conductive medium in a hydraulic system. The hydraulic actuating device is arranged or can be arranged on and/or in the hydraulic system and comprises at least one actuator module, which is in each case designed such that at least a part of the electrically conductive medium can be accelerated into at least one partial volume of the hydraulic system as a result of its interaction with the current generated by means of the respective actuator module and/or with the magnetic field generated by means of the respective actuator module. Thus, a pressure increase in at least one partial volume of the hydraulic system may be achieved. A portable reading device for blind persons is known from DE 697 23 565 T2. The portable reading device comprises an optical sensor capable of detecting printed text and an electronic device in which software is implemented and implemented for recognizing the printed characters and converting said characters into braille characters, and a touch surface. The reading device consists of a micro unit fixed on a sleeve which is inserted onto the end of the index finger of the blind person according to the thimble mode. The micro-unit has a matrix of optical sensors provided with lenses and an electromagnetic unit designed to output the recognized printed character as a braille character on the touch surface once the index finger of the blind is slid over the printed character and when the index finger is located just above the character. Six electromagnets determined for reproducing braille characters and two further electromagnets determined for showing a guidance error to the blind person are integrated into the electromagnetic unit. When the blind person uses his index finger to deflect downwards or upwards, the last mentioned electromagnet is activated when the blind person moves the index finger along the line of text. Disclosure of Invention A portable reading device for the blind with the features of independent claim 1 has the advantage that a lower supply voltage is required for the magnetohydrodynamic pump module than for the electromagnet or the piezo actuator. Furthermore, the magnetohydrodynamic pump module has no mechanical components and therefore has a longer service life. Embodiments of the present invention provide a portable reading device for blind persons, having a reading area, a haptic output component arranged in the reading area, which is embodied for producing a tactilely perceptible character and/or symbol on a touch surface, and an evaluation and control unit, which is embodied for converting text to be output into such tactilely perceptible character and/or symbol and for controlling the haptic output component accordingly. The haptic output assembly comprises a plurality of pins, each coupled to a piston-cylinder unit, movable between a start position and an end position, at least one reservoir for storing an electrically conductive medium, and a plurality of magnetohydrodynamic pump modules, each assigned to one of the movable pins and to a corresponding piston-cylinder unit. The piston cylinder units are each fluidically connected to a common reservoir or to one of a plurality of reservoirs via at least one associated magnetohydrodynamic pump module and channel. The magnetohydrodynamic pump modules are each used to pump the electrically conductive medium from the respectively connected common reservoir into the respective piston-cylinder unit via the respectively assigned channel and to move the respective movable pin from the starting position to the end position, or to pump the electrically conductive medium from the respective piston-cylinder unit into the respectively connected reservoir via the respectively assigned channel and to move the respective movable pin from the end position to the starting position. Thus, different implementation possibilities exist in the connection of the piston-cyl