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An Etched Core Plane Base of Photosensitive Material

IP.com Disclosure Number: IPCOM000098801D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Crawford, DJ: AUTHOR

Abstract

The magnetic core plane base 10 shown is designed to be etched to form the annular core groove 11, the four holes 12 through the core 13, the upper winding conductor path 14 and lower winding path 15. The plane base 10 is composed of a photosensitive material such as glass which is sensitive to ultraviolet light and has an etching rate accelerated 15 to 50 times wherever exposed.

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An Etched Core Plane Base of Photosensitive Material

The magnetic core plane base 10 shown is designed to be etched to form the annular core groove 11, the four holes 12 through the core 13, the upper winding conductor path 14 and lower winding path 15. The plane base 10 is composed of a photosensitive material such as glass which is sensitive to ultraviolet light and has an etching rate accelerated 15 to 50 times wherever exposed.

In the upper view it is seen that for every length of core winding 14 on the upper surface of base 10, there is an equal and diagonally opposite winding path 15 on the bottom surface. This complemental arrangement makes possible the use of slanted parallel beams of light passing through a mask and directed through the glass 10 as shown in the lower view. The light beam angles are chosen so that a ribbon of light is aligned with the ends of one pair of holes 12 on the top surface and aligned with the ends of a different pair of holes on the bottom surface. Thus with light at the proper angle, two sets of winding paths 14 and 15 are prepared for etching at the same time.

To achieve the full winding pattern shown in the upper view, four separate slanted exposures are required to expose the winding areas. Each of these four exposures has the light striking the surface of the glass at a different angle. After such exposures, the exposed portions which are etched and used for pairs of printed conductor or wiring grooves are shown in the lowe...