Browse Prior Art Database

Laser Perforation Technique

IP.com Disclosure Number: IPCOM000074170D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Arrabito, M: AUTHOR [+2]

Abstract

An opaque record card is perforated by a laser beam which is focused on the card in the shape of a closed line. The laser energy burns the card along the closed line, thus cutting a chip. The chip is then removed by vacuum action. This technique permits perforation of continuously fed materials.

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Laser Perforation Technique

An opaque record card is perforated by a laser beam which is focused on the card in the shape of a closed line. The laser energy burns the card along the closed line, thus cutting a chip. The chip is then removed by vacuum action. This technique permits perforation of continuously fed materials.

Laser 10 directs-a collimated-cylindrical beam of radiating energy towards a focusing system 11, shown in sectional view. The cylindrical beam entering system 11 impinges upon conical reflector 12 and then upon parabolic reflector 13, and comes out in the shape of a hollow cone converging in an annular line. A rotating deflector 14 directs the laser beam to different locations on record card
15. The beam burns card 15 along annular line 16, thus cutting out chip 17 corresponding to the energy-free area of the cone. Control circuit 18, responsive to the card and deflector positions, controls the pulsing of laser 10 for perforating holes in proper positions on card 15.

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