Browse Prior Art Database

Document Detector and Reader

IP.com Disclosure Number: IPCOM000081212D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Heiling, GM: AUTHOR [+2]

Abstract

A reflective type document detector or reader includes a light source, a light imaging lens, a light collection prism and a photodetector, all mounted on a common substrate or circuit board.

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Document Detector and Reader

A reflective type document detector or reader includes a light source, a light imaging lens, a light collection prism and a photodetector, all mounted on a common substrate or circuit board.

Light from light source 10 is imaged through molded right-angle lens 15 to form a bar of light on the document 5 being sensed. Lens 15 is plastic and has a tenon 16 for attachment to circuit board 20. Tenon 16 is received by hole 21 and is upsetted to securely attach lens 15 to board 20. Polished arcuate recess 17 accommodates light source 10 and polished protuberance 18 defines the light exit end. Lens 15 is typically positioned so that protuberance 18 is 0.100 inch away from the document 5.

Reflected light is collected by a collection prism 25 having a pair of arms 26 and 27 embracing lens 15. Prism 25 attaches to circuit board 20 by tenons 28 which are received by holes 22 and 23 in board 20. Light striking the lower polished faces of prism arms 26 and 27 is reflected internally by polished diagonal surfaces 29 and 30 to photodetector 35.

A single light source, lens, prism and photodetector can be used as a document detector, or an array can be formed as in Fig. 2 for sensing a plurality of data response positions. The data response positions can be marked for mark sensing applications or can be punched for punched hole applications.

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