Browse Prior Art Database

Automatic Green Sheet Counter

IP.com Disclosure Number: IPCOM000060539D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Froot, HA: AUTHOR [+3]

Abstract

In multilayer ceramic manufacturing operations green sheets are placed in trays prior to their being bonded in an automatic stacker. This apparatus uses an optical system to count the sheets to insure that the proper number are in place prior to the trays being placed on the automatic stacker. This would reduce production time lost when a tray contains less than the specified amount. Prior to stacking for lamination, green sheets are placed in a tray with spacer papers between them. The sheets are either 8 mils or 11 mils thick, and the spacer papers are 3 mils in thickness. Each tray is to contain a specific number of identical green sheets which represent one layer in the finished multilayer ceramic.

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Automatic Green Sheet Counter

In multilayer ceramic manufacturing operations green sheets are placed in trays prior to their being bonded in an automatic stacker. This apparatus uses an optical system to count the sheets to insure that the proper number are in place prior to the trays being placed on the automatic stacker. This would reduce production time lost when a tray contains less than the specified amount. Prior to stacking for lamination, green sheets are placed in a tray with spacer papers between them. The sheets are either 8 mils or 11 mils thick, and the spacer papers are 3 mils in thickness. Each tray is to contain a specific number of identical green sheets which represent one layer in the finished multilayer ceramic. Problems exist when a tray with an insufficient number of green sheets is loaded into the stacker since the stacker must be shut down while replacement sheets are added. The problems are less disruptive when there are a greater number of sheets in the tray or there are inconsistencies with the spacer papers. The optical system devised to count the green sheets measures the intensity of light reflected from a green sheet versus that from a sheet of backing paper. It consists of the components in Fig. 1 which includes the optical system 1, such as a microscope, with a horizontal optic axis to generate an image of the side of the green sheet stack consisting of green sheets 7 and spacer paper 8 placed on the tray 9. A light source 2 is adjusted at the appropriate angle of incidence to the side of the stack so that light will be reflected into the optical system. A mechanical apparatus 3 is used for translating the trays of green sheets vertically in front of the optical system. A rectangular mask 4 is placed in the image plane with a height less than the thickness of the spacer paper image. A light intensity detector 5 converts the intensity of light passing through the mask into an electrical signa...