Image reading apparatus and illuminator used for the same
AssigneeRohm Co., Ltd.
InventorsHiroaki Onishi, Hisayoshi Fujimoto, Norihiro Imamura
Life of this patent
Estimating the term…
Abstract
An image reading apparatus is provided for reading out images printed on a document. The apparatus includes a casing elongated in the primary scanning direction and a transparent cover supported by the casing. In image-reading operation, the cover is held in sliding contact with a document at an image reading line. The apparatus further includes an insulating substrate attached to the casing, light sources for illuminating the image reading line, light sensors for receiving reflected light coming from the image reading line and a luminosity adjuster supported by the casing for equalizing luminosity along the image reading line.
Claims13
An image reading apparatus for reading out images printed on a document comprising:
- a casing formed with an inner space, the casing being elongated in a primary scanning direction;
- a transparent cover supported by the casing, the cover being held in sliding contact with the document at an image reading line;
- an insulating substrate attached to the casing;
- a plurality of light sources mounted on the substrate for illuminating the image reading line, the light sources being arranged in a first row extending in the primary scanning direction;.
- a plurality of light sensors mounted on the substrate for receiving reflected light coming from the image reading line, the light sensors being arranged in a second row extending in the primary scanning direction;
- and
- luminosity-adjusting means supported by the casing for equalizing luminosity along the image reading line;
- wherein the luminosity-adjusting means includes at least one luminosity adjuster for shielding part of light emitted from the light sources;
- and
- wherein said one luminosity adjuster is provided with a plurality of protrusions arranged in the primary scanning direction, each of the protrusions being arranged to positionally coincide with one of the light sources in the primary scanning direction.
An image reading apparatus for reading out images printed on a document comprising:
- a casing formed with an inner space, the casing being elongated in a primary scanning direction;
- a transparent cover supported by the casing, the cover being held in sliding contact with the document at an image reading line;
- an insulating substrate attached to the casing;
- a plurality of light sources mounted on the substrate for illuminating the image reading line, the light sources being arranged in a first row extending in the primary scanning direction;
- a plurality of light sensors mounted on the substrate for receiving reflected light coming from the image reading line, the light sensors being arranged in a second row extending in the primary scanning direction;
- and
- luminosity-adjusting means supported by the casing for equalizing luminosity along the image reading line;
- wherein the luminosity-adjusting means includes at least one luminosity adjuster for allowing part of light emitted from the light sources to exit from the inner space of the casing;
- and
- wherein said one luminosity adjuster is provided with a plurality of protrusions arranged in the primary scanning direction, each of the protrusions being disposed between two adjacent light sources in the primary scanning direction.
An image reading apparatus for reading out images printed on a document comprising:
- a casing formed with an inner space, the casing being elongated in a primary scanning direction;
- a transparent cover supported by the casing, the cover being held in sliding contact with the document at an image reading line;
- an insulating substrate attached to the casing;
- a plurality of light sources mounted on the substrate for illuminating the image reading line, the light sources being arranged in a first row extending in the primary scanning direction;
- a plurality of light sensors mounted on the substrate for receiving reflected light coming from the image reading line, the light sensors being arranged in a second row extending in the primary scanning direction;
- and
- luminosity-adjusting means supported by the casing for equalizing luminosity along the image reading line;
- wherein the luminosity-adjusting means includes a plurality of first reflective partitions spaced from each other in the primary scanning direction, each of the first reflective partitions being disposed between two adjacent light sources.
An illuminator comprising:
- a plurality of light sources arranged in a line extending in a predetermined direction;
- a plurality of first reflective partitions spaced from each other in the predetermined direction, each of the first reflective partitions being disposed between two adjacent light sources;
- and
- a plurality of second reflective partitions each of which is disposed above a corresponding one of the light sources.
Dependencies are inferred from the claim text.