Browse Prior Art Database

High Resolution Contact Printer

IP.com Disclosure Number: IPCOM000049093D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Moore, GW: AUTHOR

Abstract

Apparatus is presented which allows contact printing of artwork of circuitry having a density which previously could not be printed due to loss of feature size.

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High Resolution Contact Printer

Apparatus is presented which allows contact printing of artwork of circuitry having a density which previously could not be printed due to loss of feature size.

The figure shows the high resolution contact printer including a laser 2, which may be a 3W - 5W argon laser. The beam 4 produced is passed through shutter 6 operatively connected with timer 8 in order to permit variable exposure times. Beam 4 continues to beam expander 10 which is provided to enlarge the initial beam size so that the beam passing through opening 12 in large mirror 14 completely fills the surface of small mirror 16 which has a radius of curvature. The focal point of mirror 16 is at point 20. There is thus created a virtual point source at 1/2 r since the beam is parallel to the optical axis of small mirror 16.

Large mirror 14 is positioned so that its focal point coincides with that of small mirror 16. This creates a virtual point source at the focal length of the large mirror. As a result, all light coming from this point is reflected paraxially upon striking the large mirror 14. Reflected light from mirror 14 strikes printing area 24 at a 90 degree angle with no shadows and no growth of features when artwork is copied.

One advantage of this unit is the elimination of the expanded optical axis which may have been the length of a room when a conventional incandescent light source in a semi-elliptical reflector was used for contact printing. Therefore, highe...