Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1986-11-10
1988-10-11
Caldwell, Sr., John W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340700, 340712, 250221, 250549, 178 18, G09G 100
Patent
active
047774827
ABSTRACT:
A finger-touch coordinate input apparatus according to the present invention comprises printed circuit boards provided between a display screen and its front frame and having light-emitting and light-receiving element groups thereon, and LED filters provided outside the printed circuit boards at a predetermined distance therefrom, constituting side edges of the display screen, and having light-transmitting portions at part thereof, wherein spaces formed between the printed circuit boards and the LED filters are connected to an air supply source so that an air flow is generated in at least one space, thereby easily and properly eliminating degradation of the detection function due to dust or the like at photodetectors in which the light-emitting and light-receiving elements for coordinate position detection are arranged.
REFERENCES:
patent: 4313109 (1982-01-01), Funk et al.
patent: 4459476 (1984-07-01), Weissmueller et al.
patent: 4517559 (1985-05-01), Deitch et al.
patent: 4621257 (1986-11-01), Brown
Hikosaka Koji
Kaneko Kenichi
Katsuta Hiroichi
Caldwell Sr. John W.
Honeywell Inc.
Lenkszus D. J.
Medved A.
Queen Tyrone
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