Scanning chassis with a light transparent slot
View Patent ↗A scanning chassis is suited for scanning a document. The scanning chassis includes a case, a light source, at least one reflector, a lens assembly and an optical sensor. The case has a light transparent slot shaped like a bar form, wherein the widths corresponding to the points along the longitudinal direction of the light transparent slot are not all the same. The light source can illuminate the document and an image can be generated at the place where the document is illuminated by the light source. The image can be projected on the reflector through the light transparent slot. The image can be projected on the lens assembly by the reflector's reflecting the image. The image can be projected on the optical sensor after the image passes through the lens assembly.
1. A scanning chassis, comprising:
a case comprising a light transparent slot comprising a substantially bar form shape, wherein widths corresponding to points at two sides of the light transparent slot are larger than a width corresponding to a point at a middle region of the light transparent slot, and wherein the width corresponding to the point at the middle region is determined at least by a width of a light cone of the image and an allowable error of one or more reflected angles of said at least one reflector;
a light source capable of illuminating a document and generating an image at the place where the document is illuminated by the light source;
at least one reflector capable of reflecting the image projected through the light transparent slot;
a lens assembly capable of refracting the image from said at least one reflector;
an optical sensor capable of receiving the image from said lens assembly; and
wherein the light transparent slot is located along an image path between the light source and the lens assembly.
2. A scanning chassis, comprising:
a case comprising a light transparent slot comprising a substantially bar form shape, wherein widths corresponding to points at two sides of the light transparent slot are larger than a width corresponding to a point at a middle region of the light transparent slot, and wherein the widths corresponding to the points at the two sides are determined at least by a width of a light cone of the image and an allowable error of one or more reflected angles of said at least one reflector and an allowable error of inclining the optical sensor;
a light source capable of illuminating a document and generating an image at the place where the document is illuminated by the light source;
at least one reflector capable of reflecting the image projected through the light transparent slot;
a lens assembly capable of refracting the image from said at least one reflector;
an optical sensor capable of receiving the image from said lens assembly; and
wherein the light transparent slot is located along an image path between the light source and the lens assembly.
3. The scanning chassis according to claim 1 , wherein the light transparent slot is substantially shaped like dual trumpets.
4. The scanning chassis according to claim 1 , wherein the optical sensor comprises a charge coupled device.
5. The scanning chassis according to claim 1 , wherein the optical sensor comprises a CMOS image sensor.
6. The scanning chassis according to claim 1 , wherein the light source comprises a fluorescent lamp.
7. The scanning chassis according to claim 1 , wherein the case comprises an injection molded case comprising an injection molded light transparent slot.
8. An apparatus, comprising:
a light transparent slot of a scanning chassis, wherein the light transparent slot comprises a substantially bar form shape, wherein widths corresponding to points at two sides of the light transparent slot are larger than a width corresponding to a point at a middle region of the light transparent slot, wherein the width corresponding to the point at the middle region is determined at least by a width of a light cone of the image and an allowable error of one or more reflected angles of said at least one reflector, wherein the light transparent slot is capable of passing an image of a document, and wherein the light transparent slot is located along an image path between a light source and a lens assembly.
9. The apparatus of claim 8 , wherein the widths corresponding to the points at the two sides are determined at least by a width of a light cone of the image, an allowable error of one or more reflected angles of said at least one reflector and an allowable error of inclining the optical sensor.
10. The apparatus of claim 8 , wherein the light transparent slot is substantially shaped like dual trumpets.
11. The apparatus of claim 8 , wherein the optical sensor comprises a charge coupled device.
12. The light transparent slot of the scanning chassis according to claim 8 , wherein the optical sensor comprises a CMOS image sensor.
13. A method, comprising:
illuminating a document to generate an image;
passing the image through a light transparent slot, wherein widths corresponding to points at two sides of the light transparent slot are larger than a width corresponding to a point at a middle region of the light transparent slot, and wherein the width corresponding to the point at the middle region is determined at least by a width of a light cone of the image and an allowable error of one or more reflected angles of said at least one reflector; and
passing the image from the light transparent slot to a lens assembly.
14. The method of claim 13 , further comprising determining the widths corresponding to the points at the two sides at least by a width of a light cone of the image, an allowable error of one or more reflected angles of said at least one reflector and an allowable error of inclining the optical sensor.