Browse Prior Art Database

Method of Forming a Curved Membrane Assembly Having a Concave Top Layer

IP.com Disclosure Number: IPCOM000043477D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 3 page(s) / 36K

Publishing Venue

IBM

Related People

Mayborg, CC: AUTHOR [+3]

Abstract

A method is disclosed for manufacturing a curved keyboard assembly having a membrane switch assembly. An alternative method is also discussed. A top layer 1 of a membrane assembly has its surface 2, which is its top surface during use, disposed on a convex surface 3 of a vacuum fixture 4. The vacuum fixture 4 has a pair of locating pins 5 (one shown) mounted thereon and spaced from each other in a direction normal to the drawing. The locating pins 5 extend through two locating holes 6 (one shown) in the top layer 1 to properly orient the top layer 1 on the vacuum fixture 4. The top layer 1 is formed of MYLAR* having a silver ink pattern on its surface 7, which is its bottom surface in use but its top surface during assembly.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 3

Method of Forming a Curved Membrane Assembly Having a Concave Top Layer

A method is disclosed for manufacturing a curved keyboard assembly having a membrane switch assembly. An alternative method is also discussed. A top layer 1 of a membrane assembly has its surface 2, which is its top surface during use, disposed on a convex surface 3 of a vacuum fixture 4. The vacuum fixture 4 has a pair of locating pins 5 (one shown) mounted thereon and spaced from each other in a direction normal to the drawing. The locating pins 5 extend through two locating holes 6 (one shown) in the top layer 1 to properly orient the top layer 1 on the vacuum fixture 4. The top layer 1 is formed of MYLAR* having a silver ink pattern on its surface 7, which is its bottom surface in use but its top surface during assembly. A vacuum is applied to the vacuum fixture 4 to hold the top layer 1 on the vacuum fixture 4 with the surface 2 having the desired concave shape. A spacer 8, which is formed of MYLAR having an adhesive on both sides with each side of the adhesive protected by a release paper, is mounted in a vacuum head (not shown) so that its surface 9 is concave for cooperating with the surface 7 of the top layer 1. Then, the release paper on the surface 9 of the spacer 8 is manually removed. With the spacer 8 held on the vacuum head, the vacuum head is moved downwardly to apply the adhesive surface 9 of the spacer 8 to the surface 7 of the top layer 1. The vacuum head has pressure- applying means apply pressure from the center in each direction to eliminate trapped air between the spacer 8 and the top layer 1. The spacer 8 has two holes 10 (one shown) therein receive the two locating pins 5 to obtain proper alignment. The spacer 8 also has holes (not shown) therein to enable portions of the top layer 1 to pass therethrough when depressed by keys of a keyboard with which the membrane assembly is used. After the spacer 8 is adhered to the top layer 1, the vacuum in the vacuum head is released. The spacer 8 has the release paper on its surface 11 manually removed to expose the adhesive. A bottom layer 12, whi...