Browse Prior Art Database

Linear Bar Code Scanner

IP.com Disclosure Number: IPCOM000102735D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 50K

Publishing Venue

IBM

Related People

Chu, KL: AUTHOR [+3]

Abstract

A technique is described whereby a linear bar code scanner provides a constant linear scanning velocity so that the scanner can be used in conjunction with devices which require that bar codes be read at determined velocities.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 91% of the total text.

Linear Bar Code Scanner

      A technique is described whereby a linear bar code scanner
provides a constant linear scanning velocity so that the scanner can
be used in conjunction with devices which require that bar codes be
read at determined velocities.

      The linear bar code scanner consists of housing 10, as shown in
Fig. 1, which contains DC gear motor 11, ball lead screw 12, optical
reflective sensor 13 and circuit board 14. Optical reflective sensor
13 contains a light emitter, a photo sensor and a focusing lens.
The sensor is packaged together in one unit so that a glass window at
the top enables visible light to be focused from a light emitter onto
the product containing the bar codes.  The bar codes are read from
reflected light to photo sensors.  Electrical signals are generated
from photo sensors responding to the light intensity modulation
caused by the presence, or absence, of bar code markings.  The
signals are processed and decoded to yield a specific bar code
reading.

      A key aspect of the concept is the mounting of optical
reflective sensor 13 on a precision slide.  The slide is driven by DC
gear motor 11 which controls ball lead screw 12.  DC gear motor 11 is
programmed to move optical reflective sensor 13 at a velocity
required to read the bar codes imbedded in the product.

      In actual operation, optical reflective sensor 13 will move
from position 1 to position 2, as shown in Fig. 2, for a forward scan
and from positi...