Document reading device

• US 20050052710A1
• Filed: 09/09/2004
• Published: 03/10/2005
• Est. Priority Date: 09/09/2003
• Status: Active Grant

• Current Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Original Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Inventors: Okuda, Yasuyoshi
• Granted Patent: US 7,616,352 B2
• Time in Patent Office: Days
• US Class Current: 358/474
• CPC Class Codes: H04N 1/1017 the main-scanning components remaining positionally invariant with respect to one another in the sub-scanning direction
• CPC Class Codes: H04N 1/103 by engaging a rail
• CPC Class Codes: H04N 1/193 using electrically scanned linear arrays , e.g. linear CCD arrays
• CPC Class Codes: H04N 2201/0081 Image reader H04N2201/0091 - H04N2201/0094 take precedence
• CPC Class Codes: H04N 2201/0442 Details of scanning carriage or moving picture-bearing surface support, e.g. bearing contact with guide rails

Abstract

The document reading device includes a document table having a contact glass on which a document is placed, and a reading unit having a contact type image sensor which is contained in a case body and adapted to read the document which is positioned on the contact glass. The reading unit is positioned apart from the contact glass, and so designed as to conduct reading by scanning from a home position to a final reading position in a non-contact manner, and as to reciprocally move from the final reading position to the home position.

Claims

1. A document reading device comprising:

a document table having a contact glass on which a document is placed;

a reading unit including a contact type image sensor which is contained in a case body and adapted to read said document positioned on said contact glass, and a guide shaft which is arranged in said case body to guide movements of said reading unit, wherein;

said reading unit includes a chassis attached to a base which is mounted on said guide shaft, and a contact type image sensor which is provided in said chassis, said contact type image sensor having its upper part kept in contact with a reference plane of the chassis by way of a positioning stopper, and being pushed upwardly by means of a compression spring provided in its lower part;

said guide shaft is held at a determined length from a reading face of the document, while a length from said guide shaft to said reference plane of the chassis is set so as to obtain an optimum focal length of the contact type image sensor with respect to said document, and said reading unit is positioned apart from said contact glass, and adapted to conduct reading by scanning from a home position to a final reading position in a non-contact manner, and to reciprocally move from the final reading position to the home position; and

said base of said reading unit has a through hole whose inner peripheral face is in contact with said guide shaft at three points, as seen in a sectional view.

3. A document reading device according to claim 1, wherein

said base of said reading unit is formed in a divided structure so as to stride over said guide shaft.

2. A document reading device comprising:

a document table having a contact glass on which a document is placed; and

a reading unit including a contact type image sensor which is contained in a case body and adapted to read said document positioned on said contact glass, wherein

said reading unit is positioned apart from said contact glass, and adapted to conduct reading by scanning from a home position to a final reading position in a non-contact manner, and to reciprocally move from the final reading position to the home position.