Reading apparatus
AssigneeCanon Kabushiki Kaisha
InventorNoriyuki Nose
Life of this patent
Estimating the term…
Abstract
An apparatus for dividing an original surface having image information into a plurality of areas and reading the image information with the use of a photosensor through a plurality of imaging systems provided correspondingly to said plurality of areas. The imaging systems for imaging the image information of the original surface on the photosensor include zone plates.
Claims12
An apparatus for reading an original surface, comprising:
- supporting means for supporting the original surface;
- a plurality of unit reading optical systems each for reading a respective part area of the original surface, each of said unit reading optical systems having a zone plate and a photosensor means provided at a position whereat diffracted light of at least one predetermined order from the corresponding one of said zone plates is condensed and focused to form an image of the corresponding part area of the original surface, said unit reading optical systems being arranged in a predetermined array to read the entire area of the original surface;
- and
- light intercepting means disposed between said zone plate and said photosensor means of each said unit reading optical system to block entry into said photosensor means of a light beam directed from said zone plate of an adjacent one of said unit reading optical systems.
An apparatus for reading an original surface, comprising:
- a transparent substrate,
- an array of zone plates formed on said transparent substrate;
- a plurality of photosensor means for reading respective portions of the original surface, each of said photosensor means being located at a position whereat diffraction light of at least one predetermined order from a corresponding one of said zone plates is condensed and focused to form an image of the corresponding portion of the original surface;
- means for defining a slit-like reading visual field on the original surface;
- and
- light intercepting means disposed generally between the original surface and said photosensor means to prevent entry into said photosensor means of light beams other than those from the corresponding portion of the original surface.
An apparatus for dividing an original surface into a plurality of areas and for reading each of the divided areas to thereby read the entire original surface, comprising:
- a transparent substrate;
- a plurality of zone plates formed on said transparent substrate, each of said zone plates condensing a light beam emerging from a corresponding one of the divided areas of the original surface;
- a photodetector substrate;
- a plurality of photodetector means formed on said photodetector substrate, each of said photodetector means being located at a position whereat diffracted light from a corresponding one of said zone plates is condensed and focused to form an image of the corresponding area of the original surface;
- light intercepting means formed in at least one of said substrates for excluding from said photodetector means light other than that from the corresponding one of the divided areas of the original surface;
- and
- means for defining a slit-like reading visual field on the original surface.
Dependencies are inferred from the claim text.