Browse Prior Art Database

MLC Laser Sizing - Nozzle Design

IP.com Disclosure Number: IPCOM000046040D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Chiaiese, VC: AUTHOR [+4]

Abstract

A CO/2/ circulating gas laser continuously discharging infrared laser radiation is used to cut multilayer "unfired" ceramic substrates. The laser beam is stationary. The laminate is indexed under the laser beam.

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MLC Laser Sizing - Nozzle Design

A CO/2/ circulating gas laser continuously discharging infrared laser radiation is used to cut multilayer "unfired" ceramic substrates. The laser beam is stationary. The laminate is indexed under the laser beam.

Various laser-cutting techniques have achieved qualities of cut edge profile and surface texture that are comparable to vertical sawed edges.

The use of this nozzle design facilitates the accurate cutting of substrates from unfired MLC laminates with a high powered C0/2/ laser.

The following factors control the cut characteristics of green ceramic with a C0/2/ laser:

Beam power density (W/mm/2/)

Cutting speed (cm/min)

Exit nozzle design

The exit nozzle is located at the end of the optical train and acts as a shield for the laser beam between the Final Focus Lens and the unfired ceramic laminate.

The nozzle performs two main functions:

1. It protects the laser beam from air currents and

particulates that would disperse the beam.

2. It surrounds the beam with a high velocity column

of air that removes hot gases and ceramic

particles from the cutting area.

The design of this nozzle is unique to the cutting of ceramic. Each type of material to be cut requires a nozzle of different material, length and interior cavity, orifice and gas mixture.

During the cutting process, the fringe radiation of the laser beam will cause secondary cutting of the substrate adjacent to the primary cut which is undesirable. Further, the binder resins and solvents in the substrates burn off when heated, giving rise to gaseo...