Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1984-11-20
1987-09-22
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340712, 250221, G08C 2100
Patent
active
046958274
ABSTRACT:
An electromagnetic energy interference seal arrangement is provided for use in light beam touch panel systems. The electromagnetic energy interference seal includes the use of waveguides associated with the light beam sources and detectors to improve light beam touch panel performance. The waveguide size is selected so that it operates as a waveguide above cutoff frequency for the light beams but operates as a waveguide below cutoff frequency for blocking electromagnetic energy interference. The waveguides improve the light beam signal to noise ratio since they shade the detectors from reflections and from extraneous light such as from overhead room lighting. Bonding of part of the electromagnetic energy interference seal is effected by an electrically conductive compound which enables nondestructive disassembly when required. Environmental sealing strips are provided to cover the waveguide apertures to protect against dust, liquids and other environmental contaminants.
REFERENCES:
patent: 2636125 (1953-04-01), Southworth
patent: 3673327 (1972-06-01), Johnson et al.
patent: 3764813 (1973-10-01), Clement et al.
patent: 3775560 (1973-11-01), Ebeling et al.
patent: 3860754 (1975-01-01), Johnson et al.
patent: 3907403 (1975-09-01), Maeda
patent: 3924239 (1975-12-01), Fletcher et al.
patent: 4198623 (1980-04-01), Misek et al.
patent: 4243879 (1981-01-01), Carroll et al.
patent: 4247737 (1981-01-01), Johnson
patent: 4357771 (1982-11-01), Olds
patent: 4381421 (1983-04-01), Coats et al.
patent: 4384201 (1983-05-01), Carroll et al.
patent: 4402574 (1983-09-01), McConnel
patent: 4417824 (1983-11-01), Paterson et al.
patent: 4459476 (1984-07-01), Weissmueller et al.
patent: 4484179 (1984-11-01), Kasday
patent: 4517559 (1985-05-01), Deitch et al.
patent: 4591710 (1986-05-01), Komadina et al.
U.S. patent application, Ser. No. 06/673,306 entitled Integrated Touch Panel System for Display, A. H. Beining, filed Nov. 20, 1984.
International Search Report for International Application Nos. PCT/US85/02182 and PCT/US85/02183.
Wescon Technical Paper--"Designing Business Machine Cabinets for Optimal EMI Shielding", vol. 26, Sep. 1982.
Beining August H.
Dial Larry A.
Rieck Gene W.
Smith William A.
Caldwell Sr. John W.
Fatahi-Yar Mahmoud
Hughes Aircraft Company
Karambelas Anthony W.
Runk Thomas A.
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