EP 0322515 A3 19900912 - KEYBOARD VENTING
Title (en)
KEYBOARD VENTING
Publication
Application
Priority
US 13941587 A 19871230
Abstract (en)
[origin: EP0322515A2] A keyboard (10) (e.g. for a calculator) is described including a base member having a plurality of channels (14) or a chamber, circuitry defining a plurality of switches (17) in a pattern, and optionally a plurality of domes (24) in registry with the switch sites. When a dome is depressed or deflected downwardly, the air under the dome passes into a channel or a chamber where it is distributed away from the switch site. A vent aperture (14B) communicating between the channel or chamber and the atmosphere may also be included. Membrane switches can also be used in such a keyboard.
IPC 1-7
IPC 8 full level
H01H 13/52 (2006.01); H01H 13/702 (2006.01); H01H 13/712 (2006.01)
CPC (source: EP)
H01H 13/702 (2013.01); H01H 2203/02 (2013.01); H01H 2213/002 (2013.01); H01H 2213/01 (2013.01); H01H 2213/014 (2013.01); H01H 2215/006 (2013.01); H01H 2227/006 (2013.01); H01H 2227/018 (2013.01); H01H 2227/022 (2013.01)
Citation (search report)
- [X] US 3995126 A 19761130 - LARSON WILLIS AUGUST
- [Y] US 4423294 A 19831227 - WALSER RICHARD J [US], et al
- [A] GB 2191340 A 19871209 - AMALGAMATED WIRELESS AUSTRALAS
- [A] EP 0051749 A1 19820519 - PREH ELEKTRO FEINMECHANIK [DE]
- [A] US 4463234 A 19840731 - BENNEWITZ WILLIAM W [US]
- [A] GB 2183401 A 19870603 - MORSE NENA
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0322515 A2 19890705; EP 0322515 A3 19900912; JP H01209616 A 19890823
DOCDB simple family (application)
EP 88115128 A 19880915; JP 32032888 A 19881219