초록 ▼

Apparatus with optical detecting device for reading a mark sheet provided with plural mark rows, each of which includes a reference mark, a skew detection mark and mark writing regions. The apparatus reads the mark sheet by use of a predetermined nominal scan window address for each of the regions.

Apparatus with optical detecting device for reading a mark sheet provided with plural mark rows, each of which includes a reference mark, a skew detection mark and mark writing regions. The apparatus reads the mark sheet by use of a predetermined nominal scan window address for each of the regions. Optical shift of the optical detecting device is detected and the scan window addresses are corrected in accordance with the detected shift. Further, skew of the mark sheet is detected, and scan lines for reading the mark sheet is selected in accordance with the detected skew.

대표청구항 ▼

Apparatus for reading a mark sheet fed in a mark sheet path, said mark sheet being provided with plural mark rows, each of which includes a reference mark, a skew detection mark and mark writing regions between said reference mark and said skew detection mark, which reads said mark sheet by use of p

Apparatus for reading a mark sheet fed in a mark sheet path, said mark sheet being provided with plural mark rows, each of which includes a reference mark, a skew detection mark and mark writing regions between said reference mark and said skew detection mark, which reads said mark sheet by use of predetermined nominal scan window addresses for scanning said mark writing regions to read information in said mark writing regions, said apparatus comprising: means for scanning said reference mark and said skew detection mark in a first mark row of said mark sheet to detect a distance along said first mark row between said reference mark and said skew detection mark in said first mark row; means for modifying said nominal scan window addresses by distributing a difference between said detected distance and a nominal distance over said nominal scan window addresses to form actual scan window addresses for said first mark row; means for scanning said mark writing regions in said first mark row by use of said actual scan window addresses; means for detecting shift of said reference mark position in a second mark row in the direction of said mark row with respect to said apparatus to shift said actual scan window addresses by the detected shift amount to form actual scan window addresses for second mark row; and means for scanning said mark writing regions in said second mark row by use of said actual scan window addresses for said second mark row.