Computer Graphics Plotter for the Blind
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Feb-02
Computer Graphics for the blind are currently generated in two ways. The first and most common (also the most expensive) way is to produce metal plates with the image, one positive and one negative. A sheet of paper is then placed between the plates and the plates are pressed together to form a raised image that the blind person would read in much the same way Braille is read. The other way is to use the 'period' on a standard printer or certain combination of dots on a Braille printer. These methods are either very costly or they cannot mix Braille text and graphic images because of the dot spacing of the Braille cell. The system described in this publication lends itself to reproduction of line drawings, graphs, and charts, and does so at low cost compared to existing methods.