Browse Prior Art Database

Bubble Lattice File Using Double Layer Structures

IP.com Disclosure Number: IPCOM000082731D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 60K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR [+2]

Abstract

A bubble lattice file can be made using a conveyer sheet in which a lattice exists, and another magnetic sheet carrying information in the form of the presence and absence of bubble domains. The advantage of this is that coding of bubbles within the lattice is not required. However, a double-layer structure requires efficient ways for providing information and removing information simply and in a manner which reduces the access time. This description is directed to a structure providing this type of improvement.

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Bubble Lattice File Using Double Layer Structures

A bubble lattice file can be made using a conveyer sheet in which a lattice exists, and another magnetic sheet carrying information in the form of the presence and absence of bubble domains. The advantage of this is that coding of bubbles within the lattice is not required. However, a double-layer structure requires efficient ways for providing information and removing information simply and in a manner which reduces the access time. This description is directed to a structure providing this type of improvement.

Fig. 1 shows a composite structure including multiple magnetic layers for storage of magnetic bubble domains. The first magnetic layer is a layer in which the lattice exists and this is separated from an information layer, in which information is represented by the presence and absence of bubble domains. The next layer is a layer which provides the confinement structure for the lattice layer. After this, various layers are provided for sensing of bubble domains, generation of information domains, and movement of domains within the lattice.

Fig. 2 illustrates an embodiment of the present device, in which a nucleating generator is located on the information layer for provision of information patterns comprising the presence and absence of domains. For instance, information domains Bi are shown in the information layer.

Located beneath the information layer is the lattice layer. This layer contains lattice bubbles BL within a confinement means. The lattice has a plurality of input ports and output ports for moving domains into and out of the lattice. Lattice input/output means are shown on both ends of the lattice for producing domains to be moved into and taken out of the lattice, along its left-hand and right-hand edge. Additionally, conductors which serve as lattice sweepers are used to shift the lattice to the left or right.

In operation, lattice bubbles BL are coupled to information bubbles Bi and control the movement of the information bubbles. When information is to be written into the information sheet, the Bi generator nucleates a domain which is then moved in a direction that brings it over the lattice area, by domains travelling in the input ports toward the confinement means. Consequently, the input port is comprised of a BL generator for producing lattice bubbles, a pusher means for pushing the lattice bubbles toward the confinement means, and an annihilator for destroying lattice bubbles in the input port after the information has been conveyed to the intended position.

The output port is used to remove domains from the lattice, in order to carry the associated information domains past a sensor. Since information is provided as the presence and absence of domains in the information layer, any conventional sensor used to detect the presence and absence of domains can be utilized.

In more detail, assume that two information domains Bi, as shown in the information l...