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Precision Tabular Image Fabrication

IP.com Disclosure Number: IPCOM000090806D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 51K

Publishing Venue

IBM

Related People

Barrager, SM: AUTHOR

Abstract

This arrangement photographically reproduces, in a precise manner, a plurality of like images on the face of a tubular glass member. Such member can then be used as a decorative item or as a mask for subsequent manufacturing operations. Elongated rigid opaque tube 10 has a radiation aperture 11. Disposed about tube 10 is elongated glass tube 12 which is to receive the multiple precision images. Tubes 10 and 12 are made relatively rotatable with respect to each other such that aperture 11 effectively scans the inside surface of tube 12 for providing multiple exposures.

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Precision Tabular Image Fabrication

This arrangement photographically reproduces, in a precise manner, a plurality of like images on the face of a tubular glass member. Such member can then be used as a decorative item or as a mask for subsequent manufacturing operations. Elongated rigid opaque tube 10 has a radiation aperture 11. Disposed about tube 10 is elongated glass tube 12 which is to receive the multiple precision images. Tubes 10 and 12 are made relatively rotatable with respect to each other such that aperture 11 effectively scans the inside surface of tube 12 for providing multiple exposures.

Axially movable in a reciprocating manner inside tube 10 is conical mirror 13, disposed on one free end of elongated rod 14. As the latter is reciprocated axially of tube 10, collimated radiation, such as light 15, is reflected by mirror 13 to form reflected radial radiation 16 which provides uniform illumination through aperture 11.

The precise image to be exposed on the inner surface of tube 12 is formed using photolithographic techniques on a fiat film 16 of plastic such as MYLAR*. After such precise image is formed, film 16 is disposed about tube 10 as shown, with the free ends being secured to it by film retainer 17. This permits the removal of film 16 from tube 10 such that different images can be used in successive operations. It is preferred that aperture 11 have a configuration generally following the configuration of the precise image on film 16 such that a minimum of reflected radiation is exposed to it.

The inner surface of tube 12 is first coated with a vacuum-deposited chromium. Then a suitable photoresist is coated over the chromium layer for receiving the image projected by the reflected radiation. For each exposure in a given relative circumferential position of tubes 10 and 12, rod 14 is reciprocated once. After such reciprocation, tubes 10 and 12 are rela...