Dot-matrix magnetic control convex point braille displayer

Abstract

The invention provides a dot-matrix magnetic control convex point braille displayer. The displayer comprises a surface shell, a contact array formed by contact modules and a circuit board, wherein each contact module comprises a contact shell, a base, a coil, an iron core, an ejector rod, a permanent magnet, a positioning pin, a contact and a spring; under the action of the driving force provided by an external circuit, change and lock of slip sheets of the positioning pins on the bases are realized under the combined action of the acting force generated by pushing the permanent magnets with an electromagnet and the acting force of the springs, thus realizing transition of the contact states between smooth and projection and lock of the contact states; elastic metal sheets on the bases form a feedback path which can be used for feeding back the states of the contacts; and the friction generated when the components move is reduced by spraying polytetrafluoroethylene on the surfaces of the contact cases, the bases, the ejector rods, the permanent magnets, the positioning pins, the contacts and the springs, thus shortening the reaction time of the contacts and reducing the error display rate. The displayer can be used on various braille display equipment.

Description

technical field [0001] The invention belongs to the field of braille reading tools, in particular to the fields of braille and graphic displays. Background technique [0002] The key technology of the braille display is the conversion and locking of the raised and flat states of the braille contact, so as to realize the display of braille text. [0003] The common braille display technology mainly controls the deformation of the material through magnetism, electricity or temperature, so as to control the transition of the braille contact between raised and flat. [0004] Patent No. CN03256935.1 and Patent No. CN200510105242.8 both use stepped piezoelectric sheets arranged in parallel to control the movement of Braille contacts. However, such Braille displays have complex mechanical structures, many moving parts, low strength of the overall structure, inconvenient replacement of piezoelectric sheets, complex production process, high cost of parts and difficult processing. ...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantages of existing Braille display devices, such as high production difficulty, high material cost, and difficulty in locking the contact state, the present invention uses magnetic force as the driving force, and uses a simple mechanical device to realize the state of the contact between convex and flat. State-locked device enabling Braille display

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