The InnovationQ application will be updated on Sunday, May 31st from 10am-noon ET. You may experience brief service interruptions during that time.
Browse Prior Art Database

Detection of Power Frequency for Moving a Document Table

IP.com Disclosure Number: IPCOM000043572D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05

Publishing Venue


Related People

Yanagisawa, H [+details]


The frequency of AC power applied to an AC synchronous motor for moving a document table is detected by counting pel (picture element) lines in a predetermined distance. Fig. 1 shows scanning apparatus 1 in which the document table 2 is reciprocally moved by the AC synchronous motor 3 through rack and pinion mechanism 4. The document table 2 is provided with document glass 5 and control marks 6 and 7. The marks 6 and 7 are printed on the backsurface of the document table 2. The mark and document, face down on the document glass 5, are moved relative to optical slit 8 of an optical scan system including a light source (not shown), mirror 9, lens 10 and CCD (charge-coupled device) sensor array 11. The AC synchronous motor 3 is driven by 50 Hz or 60 Hz. Fig. 2 shows the cycle time or CCD charge integration time period.