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1. (WO2018197052) TACTILE DISPLAY HAVING A MAGNETICALLY BISTABLE AXIALLY SYMMETRICAL LINEAR ACTUATOR HAVING A POLE CONTOUR AND SWITCHING MATRIX, AND OPTICAL-TACTILE SEEING AID HAVING SAME

Pub. No.:    WO/2018/197052    International Application No.:    PCT/EP2018/025133
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Sat Apr 28 01:59:59 CEST 2018
IPC: G06F 3/01
G09B 21/00
Applicants: GREINER, Luitpold
Inventors: GREINER, Luitpold
Title: TACTILE DISPLAY HAVING A MAGNETICALLY BISTABLE AXIALLY SYMMETRICAL LINEAR ACTUATOR HAVING A POLE CONTOUR AND SWITCHING MATRIX, AND OPTICAL-TACTILE SEEING AID HAVING SAME
Abstract:
The invention relates to a tactile display having a magnetically bistable axially symmetrical linear actuator having a pole contour and a switching matrix, and to an optical-tactile seeing aid having same. In order, proceeding from the known tactile displays having linear magnetic actuators, to provide such an electromagnetic actuator for tactile applications, in particular for tactile pins in Braille script displays and graphical surface displays, by means of which electromagnetic actuator an inexpensive bistable electromagnetic linear drive unit of simple mechanical design can be realized, the bar (1) of the actuator (A), proceeding from the preamble of claim 1, consists of a material having very high coercivity, i.e. the polarity thereof cannot be changed, the bar being axially enclosed by a hard magnetic sleeve (2) having at most the same length and having considerably lower coercivity, i.e. the polarity thereof can be changed, and the bar being freely movable in the axial direction and the actuation distance of the bar (1) being defined by the excess length (h) of the bar in comparison with the length of the hard magnetic sleeve (2), such that an auxiliary pole (1a) is formed at one end of the bar (1) and a planar main pole (1b) is formed at the opposite end. The invention lies in the field of tactile displays and optical-tactile seeing aids.