Illuminating unit for illuminating an original to be read by an image sensor
AssigneeCanon Kabushiki Kaisha
InventorMasami Tabata
Life of this patent
Estimating the term…
Abstract
There is disclosed an image reading apparatus constructed by an illuminating unit for illuminating an object in a line shape, an image forming optical system for forming a light, as an image, from the object illuminated by the illuminating unit, a line sensor for converting the light formed as an image by the image forming optical system into an image signal, and a frame for holding the illuminating unit and the line sensor, wherein a shape in which vertices of at least a part of the cross section of the illuminating unit are connected by straight lines is set to a polygon of a pentagon or more, so that an image can be stably read at a high quality.
Claims25
An image reading apparatus comprising:
- (A) illuminating means held in a housing, for illuminating an object in a line shape;
- (B) an image forming optical system for forming a light, as an image, from the object illuminated by said illuminating means;
- (C) a line sensor for converting the light formed as an image by said image forming optical system into an image signal;
- and
- (D) holding means for holding said housing and said line sensor,
- wherein a shape of a cross section of said housing is a polygon having at least five sides.
An image reading apparatus comprising:
- (A) illuminating means held in a housing, for illuminating an object in a line shape, said illuminating means includes an optical guide means and a light source arranged at an end of said optical guide member;
- (B) an image forming optical system for forming a light, as an image, from the object illuminated by said illuminating means;
- (C) a line sensor for converting the light formed as an image by said image forming optical system into an image signal;
- (D) holding means for holding said housing and said line sensor,
- wherein a concave portion is formed on a part of said illuminating means and said concave portion comes into engagement with a convex portion formed in said holding means.
An image reading apparatus comprising:
- (A) illuminating means held in a housing, for illuminating an object in a line shape, said illuminating means includes an optical guide means and a light source arranged at an end of said optical guide means;
- (B) an image forming optical system for forming a light, as an image, from the object illuminated by said illuminating means;
- (C) a line sensor for converting the light formed as an image by said image forming optical system into an image signal;
- (D) holding means for holding said housing and said line sensor,
- wherein a convex portion is formed on a part of said illuminating means and said convex portion comes into engagement with a concave portion formed in said holding means.
Dependencies are inferred from the claim text.