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Flat bed scanning type image reader
| Details |
Inventors: Kishida, Yoshihiro;
Assignee: Dainnippon Screen Mfg. Co., Ltd. (JP)
Primary Examiner: Brinich; Stephen
Assistant Examiner:
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
An image reader includes a half mirror or the like disposed in an optical path extending from an input optical system to a CCD line sensor, and a linear light source disposed in an optical path branched out by the half mirror. The linear light source is located at a position equivalent to the CCD line sensor with respect to a document table, and is equal in length to an effective pixel region of the CCD line sensor. Light emitted from the light source is projected back to the document table. An effective image reading area is displayed on the document table by relatively moving the document table and linear projected image in a sub-scanning direction. The linear light source is rotatable in accordance with a desired setting angle of an original. Consequently, an inclined image is projected back to the document table to serve as a guideline for setting the angle of the original. Where a spot light source is substituted for the linear light source, a spot image projected back to the document table is moved along a trimming area of an original. The trimming area is automatically determined by detecting distances of movement of the spot image. |
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DETAILED DESCRIPTION The general object of the present invention is to solve the problems of the known apparatus as noted above.
A specific object of the present invention is to provide an image reading apparatus of the flat bed scanning type, which allows an original to be set within an effective image reading area on a document table with speed and precision.
Another specific object of the present invention is to provide an image reading apparatus of the flat bed scanning type, which allows an original to be set at an angle with a main scanning direction in a relatively simple and easy operation.
A further specific object of the present invention is to provide an image reading apparatus of the flat bed scanning type, which allows trimming areas of an original to be designated with high precision and yet with speed.
Other objects and advantages of the present invention will be apparent from the detailed description to follow.
In order to achieve the above and other objects, the present invention, in accordance with one aspect thereof, provides a flat bed scanning type image reading apparatus for focusing light flux from an original placed on a document table through an input optical system to a CCD line sensor, reading an image through the CCD line sensor in a main scanning direction, effecting a sub-scan by moving the document table and the light flux relative to each other, and effecting enlargement selection for a reproduction image by varying projecting magnification of the input optical system relative to the CCD line sensor.
A light reflecting device is disposed in an optical path extending from the input optical system to the CCD line sensor to cause a branching of the optical path.
A linear light source is disposed in the optical path branched out by the light reflecting device, at a position equivalent to the CCD line sensor with respect to the document table.
The linear light source is equal in length to an effective pixel region of the CCD line sensor.
A projected image moving device is provided for moving an image of the linear light source projected back to the document table through the light reflecting device and input optical system, relative to the document table in a sub-scanning direction
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