DE2608659A1 - Bistable tactile pin for forming braille symbols - has induction coil with adjustable magnetic core giving fast response time - Google Patents

Abstract

The bistable tactile pin with mechanical interlock is for representation of braille symbols and employs an electromagnetically controlled vertical tilting or flexing effect. The bistable condition is achieved by the tilting of a mechanical element. The condition may also be achieved by tilting of two mechanical elements, flexing of a leaf spring or a combination of these motions. The motion may be produced by one or more moving magnet cores in the force field of an induction coil (solenoid), or by an impolarisable fixed magnet in this field.

Description

3description

Bistable tactile pen with mechanical locking for illustration Braille symbols 1. State of the art Electrically / electronically controllable Output units for Braille are of great benefit to blind people at work and private sector increasingly important. By being able to use Braille magnetically to save unic nit to reproduce relatively high output speeds, raises the requirement to design an output terminal that can handle these output speeds has grown.

Such an output took place according to the technology previously possible via electromagnetically operated Braille strip printer. Besides the disadvantages a relatively high paper consumption and annoying work noises arose above all, a major limitation in terms of the output speed that can be achieved. In addition, solc'Le Braille strip printers are due to their spatial volume Can only be integrated into electronic systems to a limited extent (e.g. Braillophone, 3raillex).

In recent years there have been several sound receptions at home and abroad a fast working tactile output unit has been developed, however have not led to a satisfactory solution to date.

A major obstacle, for example, was that tactile pens had to remain lifted during the reading process by electromagnetic forces; This resulted in significant problems with regard to the energy consumption required and the heat development. with more recent developments, they are parallel to each other related to magnetic pens, there are usually difficulties regarding the realization of the permissible outer diameter (approx. 2.5 mm).

In the following description an alternative concept is used offered, which is mainly in terms of space requirements and the Number of moving elements result in advantages.

2. Task It was to develop a bistable tactile pen, which, designed as a module, meets the following requirements: 2.1 Small outer diameter (2.5 mm) to enable the assembly to the flodul of a Braille cell (6 pins or 8 pins).

2.2 Secure mechanical interlocking to prevent the occurrence of tactile reading To withstand contact pressure.

2.3 Short activation times to enable quick setting and deletion of the To enable Braille cell or Braille reading bar.

2.4 Clearly definable position of the stylus for immediate To enable overwriting with a new Braille text.

2.5 As little mechanical effort as possible to meet the necessary conditions to take operational safety into account.

3. Description The desired effect of setting a fast tactile point with mechanical locking with a stroke of 0.5 to 1 mm in the presented concept achieved by the electromagnetically controlled vertical Tilting of a mechanical carrier element (groups A, B, C of the graphic Illustration), the vertical tilting of 2 mechanical support elements (group D) or by kinking a leaf spring element (group E). Due to the vertical position this tilted or kinked support element is inevitably a stroke of the Generated stylus that corresponds to the conditions of tactile reading. In both Positions a clear mechanical locking is achieved.

The energy required to achieve these effects is electromagnetic forces removed, which are essentially generated as follows: 3.1 Movement of a magnetized pen in the force field of an induction coil, 3.2 attractive or repulsive forces of a reversible electromagnet in the area of the tilting or Spring element.

The above-mentioned forces can be used individually or in combination to be brought. There are different chamber shapes for the tilting or buckling element possible here. Realization examples based on the principle presented above are shown in the drawing appendix.

L e r s e i t e

Claims (7)

3 stable tactile pen with mechanical locking for illustration of Braille symbols A n p r ü c h e Bistable tactile pen with mechanical Lock for the display of Braille symbols on the electromagnetic basis controlled vertical tilting or buckling effects, 1. characterized in that that the mechanically bistable state of the stylus by tilting a mechanical Carrier element is reached (groups A, 3 and C). 2. characterized in that the mechanically bistable state of the Stylus is achieved by tilting two mechanical support elements (group D). characterized in that the mechanically bistable state of the Stylus is achieved by kinking a leaf spring element (group E). 4. characterized in that the nechanically bistable state of the Stylus achieved by coupling changes in position according to claims 1, 2 and 3 will. 5. after response 1 to 4, characterized in that the change in position by one or more movable magnetic cores in the force field of an induction coil (Solenoid) is effected. 6. according to claims 1 to 4, characterized in that the change in position caused by a repolarizable fixed magnet in the force field of an induction coil will. 7. according to claims 1 to 4, characterized in that the change in position is effected by the interaction of electromagnets according to claims 5 and 7.