Browse Prior Art Database

Time Sharing Scanner

IP.com Disclosure Number: IPCOM000085091D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Laurer, GJ: AUTHOR [+2]

Abstract

It is common practice, in order to save hardware costs, to time share wherever possible common hardware amongst a number of devices providing the same or similar functions. Described is a time sharing scheme suitable for use with automatic label scanners.

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Time Sharing Scanner

It is common practice, in order to save hardware costs, to time share wherever possible common hardware amongst a number of devices providing the same or similar functions. Described is a time sharing scheme suitable for use with automatic label scanners.

Fig. 1 shows two complete independent scanning systems connected to a common terminal control unit, which is suitable for utilizing the information from the scanners. The circuit components in the second scanner shown in Fig. 1 marked with an asterisk can be eliminated in a time shared scanning system, such as that illustrated in Fig. 2.

The scanning system illustrated in Fig. 2 includes, in addition to the hardware illustrated in Fig. 1, for a single scanner sufficient logic marked with an asterisk needed for multiplexing the two scanners into and out of the common processing hardware. In the time shared version a single oscillator drives both sets of scanning mirrors. The second set of scanning mirrors is driven by signals which have been shifted by 45 Degrees in phase from those applied to the first scanning system.

The graph in Fig. 3 illustrates the phase relationship between the low- frequency oscillating signals applied to the two scanners, and illustrates how the information from the two scanners is interleaved and applied at the low-frequency rate to the common processing logic. While each of the scanners appears to be operating 50% of the time, the actual loss over the single indiv...