JPH03222571A - Original double side reader - Google Patents

Abstract

PURPOSE:To obtain an original double side reader with simple constitution by installing an image sensor reading information on the front side of the original and an image sensor reading information on the rear side of the original at a prescribed interval. CONSTITUTION:A 1st an image sensor 10 reading information on the front side of an original, a feed mechanism 11 feeding the original by a prescribed distance after the 1st image sensor 10 reads the original, and a 2nd image sensor 12 installed on the rear side of the original and reading information on the rear side of the original movably in the subscanning direction are provided to the reader. That is, since the 1st image sensor 10 and the 2nd image sensor 12 are installed with a prescribed interval, the information read of the original 1 is implemented with a timewise deviation. Thus, one video memory is enough for the reading, the constitution is simple and the double sides are read.

Description

[Detailed Description of the Invention] [Summary] Regarding a double-sided document reading device that can read information on both sides of a document, the present invention aims to realize a double-sided document reading device with a simple configuration. 1 image sensor, a feed mechanism that advances the document a predetermined distance after being read by the first image sensor, and a feed mechanism that is installed on the back side of the document carried by the wide mechanism and is movable in the sub-scanning direction. and a second image sensor that reads information on the back side of the document.

[Industrial Field of Application] The present invention relates to a double-sided document reading device that can read information on both sides of a document.

Most document reading devices such as copying machines read information from only one side of a document. However, some documents have information recorded on both the front and back sides, and a double-sided document reading device for reading such double-sided documents has been developed.

[Conventional technology] FIG. 7 is a conceptual diagram of the configuration of a conventional double-sided document reading device.

In the figure, a document 1 is conveyed by rollers 3 and 4 mounted on a housing 2 .

5 is a first image sensor that reads information on the front side of the document 1, and 6 is a second image sensor that reads information on the back side. The first image sensor 5 is provided outside the housing 2,
The second image sensor 6 is provided inside the housing 2 .

In the apparatus configured in this way, the document 1 is moved to the roller 3.
, 4 is conveyed by a conveyance mechanism. During this time, the first image sensor 5 reads information on the surface of the original 1, sends it to the 21IA conversion circuit 7, and converts it into digital data. On the other hand, the second image sensor 6 reads information on the back side of the document 1, sends it to the binarization circuit 8, and converts it into digital data.

The image data converted into digital data by the binarization circuit 78 is sent to a host interface or the like, where necessary image processing is performed.

[Problems to be Solved by the Invention] According to the conventional device described above, reading can be performed at high speed, but since the first and second image sensors 5.6 are installed at the same location above and below, the reading is difficult. It is necessary to independently provide a binarization circuit or the like for converting the image data into digital data. Furthermore, in order to match the reading direction of the front and back sides, it is necessary to have at least a single-sided page buffer.

The present invention has been made in view of such problems, and an object of the present invention is to provide a document double-sided reading device with a simple configuration.

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle configuration of the present invention. Components that are the same as those in FIG. 7 are designated by the same reference numerals. In the figure, ]0 is the first image sensor that reads information on the surface of the document 1;
is a feed mechanism that advances the original by a predetermined distance after being read by the first image sensor 10. The feed mechanism 1
1 is, for example, a roller 11. a, 1.1b and a document pad 1 that conveys the document 1 using the rotation of these rollers],
c, but is not limited to this configuration.

Reference numeral 12 is installed on the back side of the document 1 carried by the feed mechanism 11, and is also provided in the sub-scanning direction (direction of the arrow in the figure).
This is a second image sensor that is movable to read information on the back side of the document 1.

13 is a roller that pulls the original 1 into the apparatus.

[Function] First image sensor 10 and second image sensor 12
Since they are installed at a predetermined distance from each other, information reading of the original 1 can be performed with a time shift, and therefore only one image memory is required, which simplifies the configuration.

Also, a second image sensor 12 that reads the back side of the original 1
is movable in the sub-scanning direction, so the reading start direction when reading the back side can be determined in accordance with the reading direction of the front side, and the reading direction of both sides can be matched without having a page buffer.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing an example of the configuration of the electric circuit section of the present invention.

Components that are the same as those in FIG. 1 are indicated with the same reference numerals. In the figure, 14 is the first and second image sensor 101
A multiplexer 15 receives the output of the multiplexer 14 and selects one of them in response to a sensor switching signal, and 15 is a binarization circuit that converts the output of the multiplexer 14 into digital data. The operation of the circuit configured as described above will be explained as follows.

First, the multiplexer 14 selects the first image sensor 10 according to the sensor switching signal (because the first image sensor 10 is in the front position, as is clear from the configuration of FIG. 1). As a result, information on the surface of the document read by the first image sensor 10 is sent to the binarization circuit 15 via the multiplexer 14 and converted into digital data.

The image data converted to digital data is then sent to a host interface (not shown).

When the front side of the document has been read, the multiplexer 14 switches to the second image sensor 1 in response to the sensor switching signal.
Select 1. Information on the surface of the document read by the second image sensor 11 is sent to the binarization circuit 15 via the multiplexer 14 and converted into digital data.

The image data converted to digital data is then sent to a host interface (not shown).

FIG. 3 is an external view of an embodiment of the device of the present invention, and FIG. 4 is a mechanical diagram of the embodiment of the device of the present invention. Components that are the same as those in FIG. 1 and FIG. 2 are designated by the same reference numerals.

In FIG. 3, 20 is a document table on which the document 1 is placed;
Reference numeral 0 denotes an upper surface reading unit that reads the front side of the original document, 40 a lower surface reading unit that reads the back side of the original document 1, and 2] a stacker that stacks the read original documents. The top reading section 30 includes the first image sensor 10 described above, and the bottom reading section 40 includes the second image sensor 12.

In FIG. 4, 22 is a feed motor for arching the original 1 into the apparatus, 23 is a big belt rotated by the feed mechanism 22, 24 and 25 are rollers around which the big belt 23 is wound, and 26 is a separate plate. It's Laura. These components constitute a document pull-in section that pulls in the document 1 placed on the document table 20. 10 is a CCD (hereinafter abbreviated as CCDI) which is a first image sensor; 31
32 is a lamp that illuminates document 1, and 32 is a CCD that displays information on document 1.
The mirror 33 that guides the document to I is a lens that focuses the document information (optical information) sent through the mirror 31 and irradiates it onto the CCDI. 34 is a discharge roller that discharges the document 1. These feed motors 22. Big belt 23.
Roller 24, 25° separate roller 26. CCDI,
With mirror 31° lens 32 and discharge roller 33,
This constitutes the upper surface reading section 30 in FIG.

11d is a document pad drive motor for feeding the document 1 to the position of the second image sensor 12; 40.41
is a driven roller, roller 11a.

11b and the original pad 11c constitute the feed mechanism 11. 12 is a CCD (hereinafter abbreviated as CCD 2) which is a second image sensor; 42 is a lamp that illuminates the back side of document 1; 43 is a mirror that guides information on the back side of document 1 to CCD 2; and 44 is information sent through mirror 43. This is a lens that focuses document information (optical information) and irradiates it onto the CCD 2.

Feed mechanism 1.1. CCD2. Lamp 42. The mirror 43 and lens 44 constitute the lower surface reading section 40 in FIG. 3.

Lamp 42 Mirror 43. The lens 44 and the CCD 2 are now movable in the sub-scanning direction, and are moved in the sub-scanning direction by a drive mechanism (not shown). 51
52 is a control/image processing printed board on which a control circuit 1 and an image processing circuit are mounted. The operation of the device configured as described above will be explained as follows.

The original 1 placed on the original table 20 is pulled into the apparatus by the original drawing part. The document 1 that has been drawn in is moved to a separate roller 26. It is moved by a feed mechanism including a discharge roller 34 and a driven roller 40. During this time, the surface of the document 1 is illuminated by the lamp 31, and the optical information of the document 1 is guided to the lens 33 by the mirror 32. The lens 33 focuses the optical information of the original 1 and irradiates it onto the CCDI. C.C.
D1 converts incident optical information into an electrical signal.

As a result, information on the front surface of the document 1 is read by the CCD 1.

The document 1 whose front surface information has been read is conveyed to the position of the CCD 2 by the feed mechanism 11. Here, when the original 1 is conveyed to a predetermined position, the feed mechanism 11 stops the original 1 at that position. CCD2, lamp 42. mirror 4
3 and lens 44 moves in the sub-scanning direction (to the left or right in the figure). This sub-scanning direction is selected to align the front surface of the document 1 with the reading start direction.

During this movement in the sub-scanning direction, the information on the back side of the document 1 is
The lamp 42 illuminates the light, and the mirror 43 guides the optical information on the back surface of the original 1 to the lens 44 . lens 44
focuses the optical information of the original 1 and irradiates it onto the CCD 2. C
The CD 2 converts the incident optical information into an electrical signal. As a result, the information on the back side of the document 1 is read by the CCD 2. The original 1 that has been read is ejected from the apparatus and stored in the stacker 21.

In the above explanation, movement of the CCDI and CCD 2 in the main scanning direction was not explained. When forming the CCD1 and CCD2 as line sensors, movement in the main scanning direction is not necessary. Otherwise, a scanning operation in the main scanning direction is required.

The present invention can be used not only for one original but also for two or more double-sided originals. FIG. 5 is a diagram showing the reading direction of a double-sided document. ■Vertical, horizontal,
The main scanning direction and sub-scanning direction of the front and back sides are shown for three cases: (1) Horizontal, (i) Yellow binding, and (2) Horizontal top binding.

Note that the two holes shown in the manuscript are for files.

The reading start directions of the front and back sides are aligned according to this hole.

FIG. 6 is a conceptual diagram showing another embodiment of the present invention.

The embodiment shown in the figure differs from the principle diagram in FIG.
D2 reads information on the back side of the original 1, and then CCDI reads information on the front side of the original 1. The structure of the reading section itself is basically the same as that shown in FIG.

In the above-described embodiment, the back side of the document is read by feeding the document to a predetermined position and then reading the document while moving it in the sub-scanning direction.

However, the present invention is not limited to this, and the document that is being moved by the feed mechanism may be read with the reading unit fixed.

[Effects of the Invention] As described above in detail, according to the present invention, the image sensor that reads the information on the front side of the document and the image sensor that reads the information on the back side are installed a predetermined distance apart, so that the image sensor that reads the information on the front side of the document is installed at a predetermined distance. The information and the information on the back side can be read continuously. Therefore, the electric circuit can be shared, and a document double-sided reading device with a simple configuration can be realized.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle configuration of the present invention, Fig. 2 is a diagram showing an example of the configuration of an electric circuit of the present invention, Fig. 3 is an external view of an embodiment of the present invention, and Fig. 4 is a diagram of an embodiment of the present invention. FIG. 5 is a diagram showing the reading direction of a double-sided document; FIG. 6 is a conceptual diagram showing another embodiment of the present invention; and FIG. 7 is a conceptual diagram of a conventional apparatus. In FIG. 1, 1 is a document, 2 is a housing, 10 and 12 are image sensors, 11 is a feed mechanism, 11a and 11b are rollers, 11c is a document pad, and 13 is a roller.

Claims (1)

[Claims] A first image sensor (10
), a feed mechanism (11) that advances the original by a predetermined distance after being read by the first image sensor (10), and a secondary A second image sensor (12) that is movable in the scanning direction and reads information on the back side of the document.
A double-sided document reading device consisting of: