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US 2004/0057124 A1Published application
Lens for reading an original, method and apparatus for reading an original, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorKiichiro Nishina
Life of this patent
Estimating the term…
Abstract
A lens for reading an original, comprises five lenses as a whole including two positive and two negative lenses, an aspherical surface provided on at least one surface of the five lenses, a construction of four lens groups for five lenses which include a cemented lens constructed by cementing one of the positive lenses and one of the negative lenses, an aperture stop disposed between a second and third lens groups, and the cemented lens disposed adjacent to the aperture stop.
Claims28
A lens for reading an original, comprising;
- five lenses as a whole including at least two positive and two negative lenses;
- an aspherical surface provided on at least one surface of said five lenses;
- four lens groups of five lenses which include a cemented lens constructed by cementing one of said positive lenses and one of said negative lenses;
- and
- an aperture stop disposed between the second and third groups;
- wherein
- said cemented lens is disposed adjacent to the aperture stop.
4 more elements
A method for reading an original, comprising the steps of:
- preparing a lens for reading the original, including;
- five lenses as a whole including at least two positive and two negative lenses;
- an aspherical surface provided on at least one surface of said five lenses;
- four lens groups for five lenses which include a cemented lens constructed by cementing one of said positive lenses and one of said negative lenses;
- an aperture stop disposed between the second and third lens groups;
- and said cemented lens being disposed adjacent to the aperture stop;
- disposing the original on a contact glass in plane;
- illuminating said original in a slit like shape;
- imaging by reducing a reflected light from a portion illuminated in the slit like shape on a line sensor by said original reading lens;
- and
- reading an original image by illuminating and scanning a surface of said original with relatively displacing the illuminated portion and the original in a direction perpendicular to a longitudinal direction of said portion illuminated in the slit like shape.
8 more elements
A device for reading an original comprising;
- an illumination system for illuminating an original;
- an image-forming lens for reducing and imaging a light reflected on the original illuminated by the illumination system;
- a line sensor for conducting a photoelectric transfer of an original image imaged by the image-forming lens;
- and
- said image-forming lens including;
- five lenses as a whole including at least two positive and two negative lenses;
- an aspherical surface provided on at least one surface of said five lenses;
- four lens groups for five lenses which include a cemented lens constructed by cementing one of said positive lenses and one of said negative lenses;
- an aperture stop disposed between the second and third lens groups;
- and
- said cemented lens being disposed adjacent to the aperture stop.
8 more elements
An image forming apparatus for forming an image information as an image comprising;
- a device for reading an original image in order to change the original image to the image information;
- and
- said device for reading the original image including;
- an illumination system for illuminating an original;
- an image-forming lens for reducing and imaging a light reflected on the original illuminated by the illumination system;
- a line sensor for conducting a photoelectric transfer of the original image imaged by the image-forming lens;
- and
- said image-forming lens having;
- five lenses as a whole including at least two positive and two negative lenses;
- an aspherical surface provided on at least one surface of said five lenses;
- four lens groups for five lenses which include a cemented lens constructed by cementing one of said positive lenses and one of said negative lenses;
- an aperture stop disposed between the second and third lens groups;
- and
- said cemented lens being disposed adjacent to the aperture stop.
11 more elements
An image forming apparatus for forming an image information as an image comprising;
- a device for reading an original to read an original image in order to change the original image to the image information;
- and
- said device for reading the original including;
- an illumination system to illuminate the original;
- an image-forming lens to reduce and image a light reflected on the original illuminated by the illumination system;
- a line sensor to conduct a photoelectric transfer of the original image imaged by the image-forming lens;
- and
- said image-forming lens having;
- five lenses as a whole including at least two positive and two negative lenses;
- an aspherical surface provided on at least one surface of said five lenses;
- four lens groups for five lenses which include a cemented lens constructed by cementing one of said positive lenses and one of said negative lenses;
- an aperture stop disposed between the second and third lens groups;
- and
- said cemented lens being disposed adjacent to the aperture stop;
- wherein
- said device for reading the original includes a component for decomposing a color to read the original image with a full-color on an optical path of an optical system.
13 more elements
Dependencies are inferred from the claim text.