# US 7,826,108 B2 · Scanning apparatus for preventing defocus aberration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,826,108 B2 - Document ID: US7826108B2 - Status: Granted - Kind: B2 - Application number: 12/246,211 - Filed: 2008-10-06 - Published: 2010-02-25 - Granted: 2010-11-02 - Earliest claimed: 2008-08-22 - Assignees: Primax Electronics Ltd. - Inventors: Hsi-Yu Chen; Chien-Kuo Kuan - Web page: https://patentgrep.com/patent/US7826108B2 ## CPC - H04N 1/028: for picture information pick-up - H04N 1/02885: {Means for compensating spatially uneven illumination, e.g. an aperture arrangement} - H04N 1/031: the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors - H04N 1/0313: {Direct contact pick-up heads, i.e. heads having no array of elements to project the scanned image elements onto the photodectors} - H04N 2201/02458: Lens or optical system - H04N 2201/0246: Mirror, reflecting element or beam splitter - H04N 2201/02462: Illuminating means - H04N 2201/03104: Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame - H04N 2201/03112: Light source - H04N 2201/03116: Light source lens - H04N 2201/03141: Photodetector lens - H04N 2201/03145: Photodetector - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A scanning apparatus for preventing defocus aberration is provided. The scanning apparatus includes a flatbed scanning portion and a scanning module. The flatbed scanning portion includes a glass platform. The scanning module includes a scanning module case, a light source, multiple reflective mirrors, a lens, an optical sensing element, a printed circuit board and a metallic post. The metallic post is interconnected between the scanning module case and the printed circuit board. The printed circuit board is not in direct contact with the scanning module case so as to prevent defocus aberration resulting from thermal expansion. ## Claims ### Claim 1 A scanning module for preventing defocus aberration, said scanning module comprising: a scanning module case having a perforated structure; a light source disposed on said scanning module case for emitting a light beam and projecting the light beam onto a document; multiple reflective mirrors disposed on said scanning module case for successively reflecting said light beam; a lens for focusing said light beam; an optical sensing element for receiving said light beam and converting said light beam into an electronic signal; a printed circuit board connected to said optical sensing element for receiving said electronic signal, thereby outputting an image of said document; and a metallic post partially embedded into said perforated structure and fixed on said scanning module case, wherein said metallic post has a first end connected to said printed circuit board such that said printed circuit board is not in direct contact with said scanning module case. ### Claim 2 (depends on 1) The scanning module according to claim 1 further comprising a fixing frame between said printed circuit board and said scanning module case, wherein a first surface of said fixing frame is contacted with said printed circuit board and a second surface of said fixing frame is contacted with said metallic post. ### Claim 3 (depends on 2) The scanning module according to claim 2 wherein said first end of said metallic post is fixed on said printed circuit board by penetrating a screw through said printed circuit board and said fixing frame and then screwing said first end of said metallic post. ### Claim 4 (depends on 1) The scanning module according to claim 1 wherein a second end of said metallic post is fixed on said scanning module case. ### Claim 5 (depends on 4) The scanning module according to claim 4 wherein said second end of said metallic post is fixed on said scanning module case by screwing means, hooking means or through engagement between a protrusion and a recess. ### Claim 6 (depends on 1) The scanning module according to claim 1 wherein said optical sensing element is a charge coupled device (CCD). ### Claim 7 A scanning apparatus for preventing defocus aberration and reading an image of a document, said scanning apparatus comprising: a flatbed scanning portion including a glass platform; and a scanning module comprising: a scanning module case having a perforated structure; a light source disposed on said scanning module case for emitting a light beam and projecting the light beam onto the document; multiple reflective mirrors disposed on said scanning module case for successively reflecting said light beam; a lens for focusing said light beam; an optical sensing element for receiving said light beam and converting said light beam into an electronic signal; a printed circuit board connected to said optical sensing element for receiving said electronic signal, thereby outputting an image of said document; and a metallic post partially embedded into said perforated structure and fixed on said scanning module case, wherein said metallic post has a first end connected to said printed circuit board such that said printed circuit board is not in direct contact with said scanning module case. ### Claim 8 (depends on 7) The scanning apparatus according to claim 7 further comprising a fixing frame between said printed circuit board and said scanning module case, wherein a first surface of said fixing frame is contacted with said printed circuit board and a second surface of said fixing frame is contacted with said metallic post. ### Claim 9 (depends on 8) The scanning apparatus according to claim 8 wherein said first end of said metallic post is fixed on said printed circuit board by penetrating a screw through said printed circuit board and said fixing frame and then screwing said first end of said metallic post. ### Claim 10 (depends on 7) The scanning apparatus according to claim 7 wherein a second end of said metallic post is fixed on said scanning module case. ### Claim 11 (depends on 10) The scanning apparatus according to claim 10 wherein said second end of said metallic post is fixed on said scanning module case by screwing means, hooking means or through engagement between a protrusion and a recess. ### Claim 12 (depends on 7) The scanning apparatus according to claim 7 wherein said optical sensing element is a charge coupled device (CCD). ### Claim 13 (depends on 7) The scanning apparatus according to claim 7 further comprising an upper cover.