Contact-type image sensor for generating electric signals corresponding to an image formed on a document
AssigneeKabushiki Kaisha Toshiba
InventorHiromi Tanimizu
Life of this patent
Estimating the term…
Abstract
Light-shielding layers are adhered to the lower surface of a glass plate, spaced apart from each other and defining a slit having a width of L. An array of rod lenses is located below the glass plate, such that the optical axes of the lenses pass through the slit. The lower surface of the glass plate is generally covered, and exposed via the slit only. Hence, the leakage of lights reflected from points near a reading position into each photoelectric conversion element is minimized, whereby the element outputs a pixel signal faithfully representing that part of the image which is located at the reading position.
Claims21
A contact-type image sensor comprising:
- a light source for applying light to a document to read an image on the document;
- photoelectric conversion means for generating electric signals from an incident light;
- an optical system having an incident portion and designed to guide to said photoelectric conversion means the light applied from said light source and reflected from a predetermined position on the document;
- and
- light-shielding means having at least one shielding part located in a region between a first plane containing the incident portion of the optical system and a second plane containing the predetermined position and opposing the first plane, the light-shielding means reducing an amount of light that is reflected from a position other than the predetermined position and incident on said optical system.
A contact-type image sensor comprising:
- a document table for supporting a document to read an image on the document;
- a light source for applying light to the document supported on said document table;
- photoelectric conversion means for generating electric signals from an incident light;
- support means having a wall extending linearly to said document table;
- an optical system secured to the wall of said support means having an incident portion and designed to guide to said photoelectric conversion means the light applied from said light source and reflected from a predetermined position on the document;
- and
- light-shielding means having at least one shielding part located in a region between a first plane containing the incident portion of the optical system and a second plane containing the predetermined position and opposing the first plane, the light-shielding means reducing an amount of light that is reflected from a position closer to said light source than the predetermined position and that is incident on said optical system.
A contact-type image sensor comprising:
- a light source for applying light to a document to read an image on the document;
- photoelectric conversion means for generating electric signals from an incident light;
- an optical system having an incident portion and designed to guide to said photoelectric conversion means the light applied from said light source and reflected from a predetermined position on the document;
- and
- light-shielding means having at least one shielding part located in a region between the incident portion of the optical system and the predetermined position, the light-shielding means for reducing an amount of light that is reflected from a position other than the predetermined position and incident on said optical system.
Dependencies are inferred from the claim text.