Browse Prior Art Database

Thermal Braille Transducer

IP.com Disclosure Number: IPCOM000104538D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Affinito, FJ: AUTHOR [+2]

Abstract

Disclosed is a method by which braille characters can be produced for use in a real time output device [*].

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 92% of the total text.

Thermal Braille Transducer

      Disclosed  is  a  method  by which braille characters can be
produced for use in a real time output device [*].

      Currently braille cells are produced via electro-mechanical
means.  These mechanical systems are often costly and complicated to
produce.  This invention describes a simple system which does not
rely on cams, switches, solenoids, or other mechanical systems to
move braille pins.

      This invention produces braille by coupling a moving pin (which
is sensed by the user as a single braille dot) to a thermal snap
disc.  Six or more may be used concurrently to form braille
characters and with proper arrangement one could envision large
arrays which could produce a full screen display in braille.

      The braille pins are attached to the center of the snap disc as
shown in the figure.  When current is applied to the heater the disc
snaps and the pin is pushed beyond the cover the desired amount
(depends on the size snap disc selected).

      Due to the small distance above the cover the pin must be
raised to meet the braille standard (.019"  .001") this is well
within the limits of snap disc technology.  The snap discs are
thermally coupled to a substrate (ceramic or other suitable
material) which contains heating elements (e.g., resistive heaters).
As the disc(s) are heated they produce the desired movement of the
braille pin.  This method also eliminates the EMI encountered when
using solenoi...