Browse Prior Art Database

Glass Masters

IP.com Disclosure Number: IPCOM000089687D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Butterworth, HC: AUTHOR

Abstract

Glass template 1 inspects border registrations of the artwork patterns of glass masters (not shown) used in the manufacture of power plane cores of multilayer laminated printed-circuit (PC) panels (not shown).

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Glass Masters

Glass template 1 inspects border registrations of the artwork patterns of glass masters (not shown) used in the manufacture of power plane cores of multilayer laminated printed-circuit (PC) panels (not shown).

Opaque glass template 1 is provided with a transparent image pattern which includes various standard-size border outlines. The outlines are laid out in increasing standard PC and border X and Y dimensions, e.g., 1 WIDE, 2 WIDE and 4 WIDE along the X axis, and 2 HI, 3 HI and 6 HI along the Y axis. The image pattern includes layouts for viewing the glass master to be inspected from the front as well as the back. The image pattern includes identifying legends 1 WIDE, etc., 2 HI, etc., FRONT and BACK to assist the operator in the check-out.

In operation, the transparent glass master (not shown), with its opaque pattern, is juxtaposed on top of template 1 with either its front or back planar side facing upward depending on the desired orientation to be inspected first. Template 1 is provided with accurately located registration holes 2, which, with the aid of bushings, (not shown) coact with similar locator holes on the glass master. As such, template 1 and the glass master are maintained in alignment with respect to a given reference point. The locator holes of the glass master may be the same ones used with similar locator holes in the PC panels that are to be subsequently made therefrom.

With template 1 resting on a light table, the light passes...