Browse Prior Art Database

Fiber Optics Large Scale Read Only Memory

IP.com Disclosure Number: IPCOM000097977D
Original Publication Date: 1961-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Bruce, GD: AUTHOR [+2]

Abstract

The apparatus is an optical read only memory employing light conducting rods or optical fibers, light conducting plates, and light conducting information storage rods.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 69% of the total text.

Page 1 of 2

Fiber Optics Large Scale Read Only Memory

The apparatus is an optical read only memory employing light conducting rods or optical fibers, light conducting plates, and light conducting information storage rods.

The information selector, a cathode ray tube, has on its electro luminescent face a raster of address locations which are selectively energized by an electron beam. A separate light conducting rod, or optical fiber, connects each address location of the raster to a corresponding index point on the upper surface of a stack of light conducting plates. Each plate is coated on its upper and lower surface and its edges with an opaque material or a light reflecting mirror. It is constructed so that light introduced into the plate exists only at a selected point at one edge of the plate, and cannot cross the interface between plates in the stack. At each index point on the surface of the stack, a light-conducting information storage rod extends downwardly through all of the plates. Each rod represents a word storage location, and the sections of the rods passing through the individual plates represent bit storage locations. Information is permanently stored in a rod by providing light apertures, thereon, at selected bit locations. The light apertures are discontinuities in the surfaces of the rods which permit small amounts of light, transmitted through the rods, to be gated out into the adjacent light conducting plates. The apertures are provided by notching, scr...