Marc L Cresens

57514470, May 12, 1998

Sep 11, 1996

8/712012

Mark G. Brook - Londonderry NH
Mark E. Tellam - Charlestown MA
John F. Omvik - North Andover MA
Marc L. Cresens - Bedford MA
Christopher R. Duval - Charlestown MA
David M. Leclerc - Peabody MA

Agfa Division, Bayer Corporation - Wilmington MA

H04N 104

358487

A scanning apparatus providing separate fixed focal planes for transmissive and reflective original documents to be scanned, wherein a scan carriage containing illumination, sensor, and optical elements is moved together to scan an original document and to obtain a digitized representation thereof. The movable scan carriage has an illumination source disposed between the reflective and transmissive object focal planes, with the object focal plane to be used selected by changing the position of one or more optical elements within the scan carriage. The resolution of the digitized representation of the scanned original document can be determined by rotation of at least one lens about an axis substantially perpendicular to its optic axis.

54953618, Feb 27, 1996

May 8, 1995

8/437459

Marc L. Cresens - Bedford MA

Agfa Division, Bayer Corporation - Wilmington MA

G02F 103

359246

A method and apparatus for synchronizing the line time and color channel exposure timing signals of a CCD line sensor with the polarization control signal of an AC-polarized arc-discharge lamp in a scanning system. The scanning system comprises a scanner illumination system, including an AC-polarized arc-discharge lamp, for illuminating a document to be scanned, and a scanner imaging system for scanning the illuminated document in a line-wise manner. The scanning system of the present invention is designed to minimize brightness fluctuations on the document being scanned, improving the quality of the scanned image.

56966091, Dec 9, 1997

Jun 29, 1995

8/496511

Marc L. Cresens - Bedford MA
John F. Omvik - North Andover MA
Mark G. Brook - Londonderry NH
Kevin J. Haded - Chelmsford MA
Mark E. Tellam - Charlestown MA

Agfa Division, Bayer Corporation - Wilmington MA

H04N 104

358475

A scanning apparatus providing separate fixed object focal planes for transmissive and reflective original documents to be scanned, wherein a scan carriage containing illumination, sensor, and optical elements is moved together to scan an original document and to obtain a digitized representation thereof. The movable scan carriage has an illumination source disposed between the reflective and transmissive object focal planes, with the object focal plane to be used selected by changing the position of one or more optical elements within the scan carriage. The illumination source comprises a removable lamp cartridge with one or more lamps disposed for correct illumination of the selected object focal plane.

56592345, Aug 19, 1997

Jan 20, 1995

8/375745

Marc Cresens - Bedford MA

AGFA Gevaert, N.V.

H02P 800

318696

A method is disclosed for the reduction of vibrations in a system using a stepping motor, driving parts at a constant velocity. On a test rig, the dynamic behaviour of the stepping motor in micro stepping mode is measured by a system comprising a rotation encoder. The measured data are filtered and used to compensate the unwanted speed fluctuations. In a first method, compensation is done by modification of the theoretical current-vector angles of basic micro stepping, while keeping the current-vector length constant. In a second method, first the current-vector angles are optimized, where after the current-vector lengths are optimized to correct the stepping motor for a wide range of speeds and load torques. In both methods, the stepping frequency is constant over all steps and determined by the desired angular speed of the stepping motor.