Browse Prior Art Database

Test Probe

IP.com Disclosure Number: IPCOM000044064D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Mayborg, CC: AUTHOR [+4]

Abstract

A keyboard membrane switch assembly is tested at one station in approximately five seconds of cycle time through using a test probe for each key, with each probe having a linear actuator applying an accurately programmed small force over a small distance. Each of a plurality of keys 1 (Fig. 1) of a keyboard membrane switch assembly 2 has a separate probe 3 associated therewith. Each of the probes 3 includes a spindle 4 attached to a flexure 5 (Fig. 2), which is supported in a permanent magnet 6 adjacent the bottom thereof. The permanent magnets 6 of all of the probes 3 are mounted in a fixture having the same curvature as the keyboard membrane switch assembly 2 (Fig. 1). Each of the magnets 6 (Fig. 2) is supported on an upper portion 7 of a support 8, which has a post 9 extending downwardly from the upper portion 7.

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Test Probe

A keyboard membrane switch assembly is tested at one station in approximately five seconds of cycle time through using a test probe for each key, with each probe having a linear actuator applying an accurately programmed small force over a small distance. Each of a plurality of keys 1 (Fig. 1) of a keyboard membrane switch assembly 2 has a separate probe 3 associated therewith. Each of the probes 3 includes a spindle 4 attached to a flexure 5 (Fig.
2), which is supported in a permanent magnet 6 adjacent the bottom thereof. The permanent magnets 6 of all of the probes 3 are mounted in a fixture having the same curvature as the keyboard membrane switch assembly 2 (Fig. 1). Each of the magnets 6 (Fig. 2) is supported on an upper portion 7 of a support 8, which has a post 9 extending downwardly from the upper portion 7. A coil 10, which is a speaker-type voice coil, is disposed in an air gap 11 formed between the post 9 and the inner surface of the magnet 6. The coil 10 is mounted on the flexure 5 and extends upwardly therefrom. The large air gap 11 enables tilting of the probe 3 when it is mounted in its support structure since the keyboard membrane switch assembly 2 (Fig. 1) is curved. The large air gap 11 (Fig. 2) prevents any engagement of the coil 10 with the post 9 or the magnet 6.

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