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Browse Prior Art Database

Keyboard Encoder

IP.com Disclosure Number: IPCOM000094641D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Funk, HL: AUTHOR [+2]

Abstract

The upper drawing shows an exploded view of a portion of a keyboard encoder. The lower drawing shows a side view of the encoder as it is constructed. Each encoder key 10 has three conical projections on its lower side. These projections align with three index positions for each key of the encoder sandwich. The sandwich consists of an upper substrate 12 having three conducting strips 14, one for each of the projections on keys 10, plated on its underside. The conducting strips pass through the index positions, shown as phantom line circles, to which they correspond.

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Keyboard Encoder

The upper drawing shows an exploded view of a portion of a keyboard encoder. The lower drawing shows a side view of the encoder as it is constructed. Each encoder key 10 has three conical projections on its lower side. These projections align with three index positions for each key of the encoder sandwich. The sandwich consists of an upper substrate 12 having three conducting strips 14, one for each of the projections on keys 10, plated on its underside. The conducting strips pass through the index positions, shown as phantom line circles, to which they correspond.

Under substrate 12 is insulating layer 16 having cutouts selectively formed in it corresponding to the various index positions. Under layer 16 is substrate 18 having three conducting strips 14' on its upper surface and three conducting strips 20 on its lower side. Strips 14' and 20 are identical in configuration to the strips 14. Under substrate 18 is another insulating layer 22 having openings selectively formed in it at various ones of the index positions. The bottom sandwich layer is substrate 24 having conducting strips 20' on its upper side. These strips are identical in configuration to conducting strips 20.

In operation, when a key 10 is depressed, the projections on it cause such of the strips 14 and 14' as are adjacent to openings in layer 16 to be brought into contact with each other. Also, such of the strips 20 and 20' as are adjacent to openings in layer 22 to be brought in...