Slit exposure device with white reflecting member

An original exposure device comprising:

• an original carriage for supporting an original;
• an original stopping reference member provided at one end of said original carriage;
• a slit exposure scanning system for illuminating a slit area on an original, said illuminating system having at least a light source and an auxiliary mirror opposed to said light source with the image forming main optical path from said slit area interposed therebetween, said illuminating system being movable relative to said original carriage;
• and
• a white member fixedly disposed in the image forming main optical path at a boundary portion between said original stopping reference member and one end of the original, said white member being disposed substantially in parallel with a light beam from said light source and reflected by said auxiliary mirror toward said slit area, and said white member being adapted to intercept the image forming light beam from said boundary portion and effectively direct part of the illuminating light beam of said slit exposure scanning illuminating system to an image plane through an image forming element.

An original exposure device comprising:

• an original carriage for supporting an original;
• an original stopping reference member provided at one end of said original carriage;
• an glass keep member provided at the other end of said original carriage;
• an original carriage cover placed on said original carriage and having a white back side;
• a slit exposure scanning system for illuminating a slit area on an original, said illuminating system having at least a light source and an auxiliary mirror opposed to said light source with the image forming main optical path from said slit area interposed therebetween, said illuminating system being movable relative to said original carriage;
• a first white member fixedly disposed in the image forming optical path at a boundary portion between said original stopping reference member and one end of the original, said white member being disposed substantially in parallel with a light beam from said light source and reflected by said auxiliary mirror toward said slit area, and said first white member being adapted to intercept the image forming light beam from said boundary portion and effectively direct part of the illuminating light beam of said slit exposure scanning illuminating system to an image plane;
• and
• a second white member fixedly disposed in the image forming main optical path from the end of said glass keep member and aligned corresponding to the average angle of incidence of the illuminating light beam incident on said slit area, said second white member being adapted to intercept the image forming light beam from said end of said glass keep member and effectively direct part of the illuminating light beam of said slit exposure scanning illuminating system to the image plane.

An original exposure device comprising:

• an original carriage for supporting an original;
• an original stopping reference member provided at one end of said original carriage;
• means providing first and second light beams with the image forming main optical path interposed therebetween, wherein said first and second light beams slit-illuminate the same portion on the original, and are movable along said original carriage to slit-scan the original;
• and
• a member for intercepting the image forming light beam from a boundary portion between the original and said original stopping reference member and for effectively directing light from said second light beam toward an image plane, when said slit-illuminating means is positioned for illuminating said boundary portion, said member being disposed substantially in parallel with light from said first light beam and directed toward a slit area on the original to be illuminated.