# US 7,411,704 B2 · Multiple-background device for a scanner and calibration device utilizing the same principle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,704 B2 - Document ID: US7411704B2 - Status: Granted - Kind: B2 - Application number: 11/085,454 - Filed: 2005-03-21 - Published: 2005-11-03 - Granted: 2008-08-12 - Earliest claimed: 2004-04-30 - Assignees: Avision Inc. - Inventors: Bo-Hsiang Wang - Web page: https://patentgrep.com/patent/US7411704B2 ## CPC - H04N 1/38: Circuits or arrangements for blanking or otherwise eliminating unwanted parts of pictures (H04N1/387 takes precedence) - H04N 1/121: {Feeding arrangements (transporting sheets to or from the scanning position H04N1/0057; control or error compensation of sub-scanning velocity H04N1/0473)} - H04N 1/125: {the sheet feeding apparatus serving an auxiliary function, e.g. as a white reference} - H04N 1/2032: {of two pictures corresponding to two sides of a single medium (refeeding a sheet for double-sided scanning H04N1/00572)} - H04N 1/401: Compensating positionally unequal response of the pick-up or reproducing head (H04N1/403 takes precedence) - H04N 1/1215: {Feeding using one or more cylindrical platens or rollers in the immediate vicinity of the main scanning line} - H04N 1/193: using electrically scanned linear arrays {, e.g. linear CCD arrays} - H04N 2201/044: Moving a scanning element into cooperation with a calibration element, e.g. a grey-wedge mounted on the document support, or vice versa - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A multiple-background device for a scanner and a calibration device utilizing the same principle are disclosed. The multiple-background device includes a shaft, a low-reflectance portion and a high-reflectance portion are formed along the length of the shaft. Thereby the shaft can provide various background colors, and the optical module can acquire a plurality of scan lines by means of rotating the shaft for image calibration. ## Claims ### Claim 1 A multiple-background device for a scanner to provide an optical module with multiple scan backgrounds, comprising: a rotating shaft rotatably disposed on a position opposite to said optical module, having: a low reflectivity area formed axially on a surface of said rotating shaft; a high reflectivity area formed axially on a surface of said rotating shaft and adjacent to said low reflectivity area; and a power source driving said rotating shaft so that said low reflectivity area and said high reflectivity area are selectively facing said optical module; wherein said rotating shaft is a prism. ### Claim 2 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said low reflectivity area is black. ### Claim 3 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said high reflectivity area is white. ### Claim 4 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said low reflectivity area and said high reflectivity area are formed with color sheets of different light reflection coefficients. ### Claim 5 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said low reflectivity area and said high reflectivity area are formed with paints of different light reflection coefficients. ### Claim 6 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said low reflectivity area and said high reflectivity area are formed with materials of different light reflection coefficients. ### Claim 7 (depends on 1) The multiple-background device for a scanner of claim 1, wherein the power source is a motor. ### Claim 8 (depends on 7) The multiple-background device for a scanner of claim 7, wherein said rotating shaft rotates relatively to said optical module, allowing said optical module to capture a plurality of scan lines therefrom for shading correction. ### Claim 9 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said power source drives a document feeder installed on said scanner. ### Claim 10 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said power source drives said optical module. ### Claim 11 (depends on 1) The multiple-background device for a scanner of claim 1, wherein said power source is a solenoid valve. ### Claim 12 A multiple-background device for a scanner to provide an optical module with multiple scan backgrounds, comprising: a rotating shaft rotatably disposed on a position opposite to said optical module, having: a low reflectivity area formed axially on a surface of said rotating shaft; a high reflectivity area formed axially on a surface of said rotating shaft and adjacent to said low reflectivity area; and a power source driving said rotating shaft so that said low reflectivity area and said high reflectivity area are selectively facing said optical module; wherein said low reflectivity area is a trough formed axially along said rotating shaft. ### Claim 13 (depends on 12) The multiple-background device for a scanner of claim 12, wherein said rotating shaft is a cylinder. ### Claim 14 (depends on 12) The multiple-background device for a scanner of claim 12, wherein said rotating shaft is a prism. ### Claim 15 A calibration device for a scanner for shading correction of an optical module, comprising: a rotating shaft rotatably disposed on a position opposite to said optical module and having a surface area of a specific light reflection coefficient; and a power source driving said rotating shaft to rotate relatively to said optical module, allowing said optical module to capture a plurality of scan lines therefrom for shading correction; wherein said rotating shaft is a prism. ### Claim 16 (depends on 15) The calibration device for a scanner of claim 15, wherein the power source is a motor. ### Claim 17 (depends on 15) The calibration device for a scanner of claim 15, wherein said power source drives a document feeder installed on said scanner. ### Claim 18 (depends on 15) The calibration device for a scanner of claim 15, wherein said power source drives said optical module.