IMAGE READER WITH TWO DUPLEX
The present disclosure relates to the subject matter contained in Japanese Patent Application No. 2002-164252 filed Jun. 5, 2002, which is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an image reader for reading an original image by an image sensor and the like, particularly to an image reader capable of reading original images on both sides and the like.
2. Description of the Related Art
Hitherto, an image reader for automatically reading image information on both sides of an original without the intervention of the user (automatic double-side reader) has been widely used as a reader of a copier, a facsimile, etc., or a scanner for computer input. As the automatic double-side readers, a method of reversing the side of an original in an original reversal section and reading image information is most widely adopted. That is, to input image information on both sides in the method in the related art, one side is read in an original read section and then the side of the ejected original is reversed and again is transported to the original read section for reading the other side.
However, in the automatic double-side reading by inverting the side, it is necessary to reverse the original after once being ejected and again transport the original to the original read section and thus it takes much time in reading both sides and the productivity is poor in reading both sides. The original reversal section requires a complicated mechanism to reverse the side of an original and the original jam occurrence percentage in the original reversal section is high as compared with other transport sections. Improving the reliability is required. Further, to design an automatic double-side reader that is placed in a narrow space, the necessity for inverting an original rapidly in a small diameter may occur because of the necessity for inverting the original and collating the pages of the original at the paper ejection time, etc. Consequently, it is difficult to transport an original of a predetermined cardboard having a large basis weight.
An art of automatically reading both sides in one transport is studied. For example, in JP-A-1-171360 and JP-A-1293757, two image sensors are placed on both sides of an original path for transporting an original and both sides of an original can be read automatically in one original transport without reversing the side of the original.
Generally, to read an original, for example, a technique of applying light from a light source of a fluorescent lamp to the original and reading the reflected light by an optical sensor through a reduction optical system is adopted. As the sensor in the technique, for example, a one-dimensional CCD (Charge Coupled Device) sensor is used to process one line at a time. Upon completion of reading one line in the line direction (main scanning direction), the original is moved a minute distance in the direction orthogonal to the main scanning direction (subscanning direction) and the next line is read. This operation is repeated over the whole original size for completing reading of one page of the original. As a method of reading an original in order in the subscanning direction without moving the original, a method of moving a plurality of mirrors by a moving body
such as a full-rate carriage or a half-rate carriage for reading an original in order in the subscanning direction is also available.
In the read technique, it is necessary to apply a light
5 source to an original and reading the reflected light by a CCD sensor through several mirrors as described above and thus the whole unit tends to become large. Particularly, if a plurality of image sensors need to be placed to read both sides without reversing an original, it is difficult to place a
10 plurality of CCD sensors because of a space problem. To solve the space problem, use of an image sensor called CIS (Contact Image Sensor) for directly reading an image by a linear sensor through a SELFOC lens using a small LED (Light Emitting Diode) as a light source is studied.
15 However, in the read technique using the CIS, the focal depth is very shallow and if the CIS and an original face go out of distance even a little, out-of-focus occurs and the read image becomes unclear. That is, it becomes hard to provide a sharp image although the whole unit can be reduced.
20 Particularly, to read a color image, a color shift, etc., easily occurs and degradation of the image quality is remarkable. If both reading by the CCD sensor and reading by the CIS are used to automatically read both sides of an original, it becomes hard to match the image quality in the CCD sensor
25 with that in the CIS. For example, if an image read through the automatic double-side reader is printed out, images different in image quality on both sides are output. Such an image quality match problem noticeably appears particularly in color images. For example, so-called business color
30 images such as images with a small number of colors (like plus one color, etc.,) may be able to be handled, but image quality shift becomes particularly large in a catalog image, a photo image, etc., and automatic double-side reading using both the CCD sensor and the CIS cannot be practical if
35 importance is placed on the image quality.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an 40 image reader and an original feeder excellent in the ease of use to execute double-side original read.
It is another object of the invention to appropriately meet the requirements of speeding up, high image quality, etc., of image reading.
45 According to the invention, there is provided an image reader comprising a paper feed section for feeding an original from a bundle of originals; a transport passage for transporting the original fed by the paper feed section; a first sensor for reading an image on one side of the original from
50 one side of the transport passage; and a second sensor for reading an image on the other side of the original from the opposed side to the one side of the transport passage, wherein the image reader has a first double-side read mode of reading the images on both sides of the original using the
55 first sensor in order; and a second double-side read mode of reading the images on both sides of the original in one transport of the original to the transport passage using the first sensor and the second sensor. The first double-side read mode has the feature of reading one side of the original using
60 the first sensor and then reversing the side of the original in the transport passage and reading the other side of the original using the first sensor.
The second sensor differs from the first sensor in resolution characteristic. For example, the first sensor can be an
65 image sensor for reading reflected light on the original through a reduction optical system, and the second sensor can be an image sensor for reading reflected light on the