Education and demonstration – Communication aids for the handicapped – Tactile reading aid
Patent
1992-10-02
1994-02-15
Wilson, John J.
Education and demonstration
Communication aids for the handicapped
Tactile reading aid
434112, 434113, 310311, G09B 2100, H01L 4104
Patent
active
052861996
ABSTRACT:
An electromechanical transducer comprise a piezoelectric transducer element (5), which is arranged in a pressurized chamber (3) filled with a fluid (4). The piezoelectric transducer element (5) can comprise a plurality of piezoceramic platelets connected with each other by thin-walled metallic contact platelets, which are also connected electrically to connector pins (10) on the outside of a housing (1) in which the pressurized chamber (3) is located. When a controlling voltage is applied to the connector pins, the transducer element (5) experiences a reversible deformation, which is transmitted to the fluid, so that an operating element (14) is raised above a contacting surface (16) according to the force on the fluid. The transducer element (5) can be separated from the fluid (4) by a membrane (17). The platelets can be connected to the connector pins via spring-like resilient conductive contact pieces for maintaining electrical contact when the piezoceramic platelets are in a deformed activated state. In the case of Braille modules for representing information for the blind the operating element (14) can be a pin detectable by touch. An array of modules of this type can be used to represent graphical information as well as letters and numbers.
REFERENCES:
patent: 3304446 (1967-02-01), Martiner et al.
patent: 4283178 (1981-08-01), Tetzlaff
patent: 4633121 (1986-12-01), Ogawa et al.
patent: 4761582 (1988-08-01), McKee
patent: 4875378 (1989-10-01), Yamazaki et al.
patent: 5165897 (1992-11-01), Johnson
Cherichetti Cindy A.
Striker Michael J.
Wilson John J.
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