Browse Prior Art Database

Double Window for Laser Safety

IP.com Disclosure Number: IPCOM000083262D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Dickson, LD: AUTHOR

Abstract

In a laser bar-code scanner, the window 1, Fig. 1, must be periodically replaced, as it tends to become scratched when code-bearing articles are pulled across it. When the window is removed, the integrity of the protective housing is violated, making it possible to be exposed to higher levels of laser radiation.

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 100% of the total text.

Page 1 of 2

Double Window for Laser Safety

In a laser bar-code scanner, the window 1, Fig. 1, must be periodically replaced, as it tends to become scratched when code-bearing articles are pulled across it. When the window is removed, the integrity of the protective housing is violated, making it possible to be exposed to higher levels of laser radiation.

Fig. 2 shows a cross section of the window assembly, taken along line A-A of Fig. 1. Upper window 1 is mounted so that it can easily be removed and replaced when scratched or damaged. A flexible gasket 3 holds window 1 in place as it rests on projecting ledge 4. The lower or inner window 2 is similar to upper window 1, except that it is sealed in place and cannot be removed by the operator. The lower window 2 can only be removed from inside the machine housing by a qualified serviceman. This arrangement maintains the integrity of the protective housing, thereby guaranteeing that the product remains in the safe U.S. Bureau of Radiological Health (BRH) Class I category during any condition of normal use.

The use of the double window allows an inexpensive operator-replaceable window without violating the integrity of the protective housing.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]