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Spring and Magnet Keyboard Actuator

IP.com Disclosure Number: IPCOM000048388D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 86K

Publishing Venue

IBM

Related People

Lennon, KA: AUTHOR

Abstract

A keyboard actuator includes a spring mounted keybutton and a magnet mounted switching member arranged to provide an easily assembled keyboard arrangement.

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Spring and Magnet Keyboard Actuator

A keyboard actuator includes a spring mounted keybutton and a magnet mounted switching member arranged to provide an easily assembled keyboard arrangement.

A cross section of a portion of a keyboard is depicted in Fig. 1. Keybutton 11 is mounted to the end of flat spring steel keylever 12 which is mounted onto retaining member 13. Member 13 is a molded part having channels 14 which hold magnets 15. The magnets extend across the entire keyboard, there being four such magnets, one for each keyboard row. as depicted in Fig. 2. Corresponding to each keybutton 11 is a T shaped switching plate 17 which is held in place by a magnet 15. Depression of keybutton 11 (to the phantom line position) causes it to push on plate 17, causing end 19 to leave magnet 15 while forcing end 21 to contact circuit board 23 having a switching member 25 mounted thereon. The contact of ends 21 with switching member 25 may be capacitively or resistively sensed. When keybutton 11 is released, it is returned by keylever 12 to its initial position. Additionally, magnet 15 pulls end 19 of plate 17 to its rest position against magnet 15.

Fig. 3 shows the keylevers 12 for the various rows of keybuttons and how they are formed from a single sheet 31. Members 33, 34, 35 and 36 are respectively located in different keyboard rows. Members 37 and 38 receive the spacebar of a typical keyboard. It is noted that all four rows of keybuttoms have this same length keylever...