Browse Prior Art Database

A REFLECTIVE SCANNER

IP.com Disclosure Number: IPCOM000023099D
Original Publication Date: 1976-Aug-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 260K

Publishing Venue

Xerox Disclosure Journal

Abstract

A scanner 10 includes a pair of sensing units for detecting marks on paper 12, on closely spaced tracks, as the paper is moved with respect to the sensing units. Structurally, the scanner includes a housing 13 having a flat surface 14 and a flat transparent plate 21 fixed on one side against the flat surface. Each sensing unit includes a first bore 15 perpen~' dicularly communicating with the flat surface, and a second bore 18 communicating with the plate at an acute angle, the axes of the bores theoretically intersecting at a point on

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 95% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

A REFLECTIVE SCANNER
Raymond A, Wilmes

Proposed Classification
U.S. Cl. 250/239
mt. Cl, HOlj 5/02

A scanner 10 includes a pair of sensing units for detecting
marks on paper 12, on closely spaced tracks, as the paper is
moved with respect to the sensing units. Structurally, the
scanner includes a housing 13 having a flat surface 14 and a
flat transparent plate 21 fixed on one side against the flat
surface. Each sensing unit includes a first bore 15 perpen~'
dicularly communicating with the flat surface, and a second
bore 18 communicating with the plate at an acute angle, the
axes of the bores theoretically intersecting at a point on

PIGS 2

Volume 1 Number 8 August 1976 33

[This page contains 1 picture or other non-text object]

Page 2 of 2

A REFLECTIVE SCANNER (Cont~d)

the other side of the plate. An opaque member 23 biases the
paper against said other side of the plate and in each
sensing unit a light source 17 provides, through the first
bore, incident light on the paper. A biased phototransistor
20 mounted in the housing responds to the light reflected
from the paper and passing through the second bore. As a
result, marks on the paper are detected. The emitter lead of
each of the phototransistors in the sensing units is connected
to its respective case, and to conserve space the cases are
electrically connected with a conductive strip 36, the strip
and phototransistors being supported by a split nylon block
34 mounted in the housing.

34 XEROX DISCLOSURE JOURN...