METHOD AND APPARATUS FOR KEEPING A DOCUMENT IN FOCUS DURING NONCONTACT SCANNING

摘要

THIS INVENTION RELATES TO A SCANNING DEVICE FOR SCANNING A DOCUMENT SUCH AS A PHOTOGRAPH USING AN IMAGE SENSOR DEVICE THAT USES OPTICS (307) THAT MAY HAVE A NARROW DEPTH OF FOCUS, THE SCANNING AVOIDING CONTACT OF THE DOCUMENT (101) BY THE IMAGE SENSOR DEVICE DURING SCANNING.THAT IS, THE FOCAL VOLUME (311) OF THE SENSOR DEVICE IS AT A DISTANCE FROM THE IMAGE SENSOR DEVICE.THE SCANNING DEVICE INCLUDES A POSITIONING MECHANISM THAT MAINTAINS THE FRONT SURFACE OF THE DOCUMENT (101) IN THE FOCAL VOLUME (311) DURING SCANNING.(FIG 13)