Browse Prior Art Database

Reading Small, Tightly Spaced Bit Patterns

IP.com Disclosure Number: IPCOM000097010D
Original Publication Date: 1962-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Seibel, R: AUTHOR

Abstract

This device reads data stored on a storage medium such as punched paper tape. It provides an accurate interpretation of the data, while requiring no vertical registration of the storage medium. The device includes a parallel light source, the rays of which are projected through perforations on a moving paper tape 100.

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Reading Small, Tightly Spaced Bit Patterns

This device reads data stored on a storage medium such as punched paper tape. It provides an accurate interpretation of the data, while requiring no vertical registration of the storage medium. The device includes a parallel light source, the rays of which are projected through perforations on a moving paper tape 100.

Light passing through each perforation is optically magnified via lens 101 and projected onto a vertical bank of photocells 1, 2, 3... n. The beam width of the projected ray encompasses more than a single cell. Each character of information stored on the paper tape is composed of a number of bits vertically aligned in a column with a reference bit R located at the bottom of the column which is used as a floating reference point. This reference point is used to identify all other bits.

Although the breadth of the projected beam encompasses more than a single photocell, the total number of cells per bit is sufficient to allow the cells of each bit to be split into two groups 1A, 2A...nA and 1B, 2B...nB. Thus, the majority of cells actuated in one of the two groups determines the reference points for identifying the other bits of information.

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