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Shutterless Laser Scanner Capable of Class 1 Operation

IP.com Disclosure Number: IPCOM000042069D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Broockman, EC: AUTHOR [+3]

Abstract

This article describes three techniques for permitting a supermarket scanner to operate in a Class 1 mode without mechanical, light-blocking shutters. The three techniques are similar in that the laser does not remain on continuously when it is unlikely that items will be presented for scanning. The first technique is to energize the laser as part of an operator sign-on procedure and to de-energize the laser as part of the operator sign-off procedure. For reasons of security, operators do not leave checkstands unattended for extended periods of time without signing off. Therefore, normal operating procedures assure that the laser will be off when the scanner is unattended. The second technique is to de-energize the laser at the conclusion of each checkout order.

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Shutterless Laser Scanner Capable of Class 1 Operation

This article describes three techniques for permitting a supermarket scanner to operate in a Class 1 mode without mechanical, light-blocking shutters. The three techniques are similar in that the laser does not remain on continuously when it is unlikely that items will be presented for scanning. The first technique is to energize the laser as part of an operator sign-on procedure and to de-energize the laser as part of the operator sign-off procedure. For reasons of security, operators do not leave checkstands unattended for extended periods of time without signing off. Therefore, normal operating procedures assure that the laser will be off when the scanner is unattended. The second technique is to de- energize the laser at the conclusion of each checkout order. Special keys or switches are provided to allow the operator to energize the laser before the next order is processed. Thus, the laser will not be energized between orders, which is the only time the checkstand is likely to be unattended for any significant period of time. The third and last technique requires that the laser operate alternately in search and scanning modes. During operation in the search mode, the laser is energized intermittently at a low duty cycle, for example, 10% of the time. If a UPC label is detected while the scanner was operating in a search mode, the scanner switches into the scanning mode during which the laser would remain...