JP3393178B2 - Image reading device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading device for reading an image, and in particular, a document table on which a document is transparent (document table).
The present invention relates to an image reading apparatus that makes it possible to read a transparent original and a reflective original by using the same optical system when reading an image of the original placed on the substrate.

[0002]

2. Description of the Related Art An image forming apparatus converts an input image data into a visible image and outputs it as a hard copy. This image forming apparatus is
For example, according to a digital copying machine, a document placed on a transparent document table surface mainly made of glass is optically scanned with light emitted from a light source, and the obtained reflected light is read. An image is picked up by a light receiving portion of a photoelectric conversion element such as a CCD which is an element, image data photoelectrically converted by each element is input, and this is reproduced on a photoconductor for visualizing,
Finally, it is transferred to a sheet or the like and a hard copy is output.

Further, the image forming apparatus is not limited to the digital copying machine as described above, but image data created by an information processing apparatus such as a personal computer or a word processor is reproduced so that it can be visually observed. There are printers that output this as a hard copy, such as a laser printer, an inkjet printer, and a thermal printer.

As described above, the image forming apparatus is configured to be able to provide the reproduced image desired by the user.
On the other hand, as an apparatus for inputting image data to the image forming apparatus or the like, as described above, the original is placed on the placing table formed of transparent glass or the like, that is, the original table, and this placing is performed. There is an image reading device, commonly called a scanner, which reads an image of a document that has been read through a reading means, processes the read data so that the image forming device can reproduce the image, and outputs the image data as image data. .

This scanner is permanently installed in a digital copying machine, a facsimile or the like, and is connected to a personal computer or the like so that a desired image can be edited on the personal computer side.

The image reading device (scanner) having the above-described role is usually a device which normally reads an image using a reflective original. Therefore, not only a reflective original document but also a transparent original document that is arbitrarily read as needed has been proposed and put into practice.

For example, Japanese Laid-Open Patent Publication No. 9-191368 provides a transparent film mounting table for reading a transparent original in addition to a transparent original table for reading an image of a reflective original. A scanning optical system for forming an image of reflected light from a reflection original placed on a CCD constituting a reading unit is arranged under the original table. When the transparent original on the film mounting table is read and scanned, the scanning optical system is stopped and a part of the optical path of the scanning optical system is moved at a predetermined speed to be the same. An optical system is used to read an image of a transparent original.

Further, in Japanese Unexamined Patent Publication No. 6-315067, a projector is provided which is arranged adjacent to a document table provided for reading a reflection document and which is configured to project and read a transparent document having a different structure. An image reading apparatus having a configuration is disclosed. According to this image reading apparatus, a scanning optical system for optically scanning a reflective original is provided separately from the projector. Then, the image is read by forming an image of the reflection original or the transmission original on the CCD constituting the reading unit. For that purpose, the CCD is scanned so as to run at the position projected by the projector, thereby reading the image of the transparent original. In the image reading device described in this publication, the CCD is also used for reading a transparent original and a reflective original, and an optical system for forming an image on the CCD is separately provided.

Further, Japanese Unexamined Patent Publication No. 6-86020 discloses an apparatus for reading an image by commonly using a common original table on which a reflective original and a transparent original are placed and a light source for illuminating the original. . According to this apparatus, with the document table as a boundary, a transparent document reading unit is provided above the document table and a reflective document reading unit is provided below the document table. Therefore, each reading unit is provided with a CCD. The image reading device described in this publication is different from the image reading devices described in the above-mentioned two publications.
Although different in that the same CCD is used, the feature is that the image can be read using the same document table.

[0010]

As described above, according to the conventional image reading apparatus capable of reflecting and transmitting originals, it is suggested that a part of the optical system for reading an image is shared. There is. However, when the reflective original and the transparent original are arranged and read at different positions, it is necessary to provide a separate area for placing (setting) each original. Therefore, if the set state is wrong, normal image reading cannot be performed. In this respect, according to the apparatus disclosed in Japanese Patent Laid-Open No. 6-86020, the reflective original or the transparent original is placed on the same original table, so that the placing position is not mistaken.

However, since the image reading surface of the original is different for each original, it is necessary to replace the diffuser or the reflector with the original for use. Such replacement work is very troublesome, and at that time, there is also a risk of making a mistake in mounting.

On the other hand, according to the reading device disclosed in Japanese Patent Laid-Open No. 315067/1994, as described above, the projector for forming an image of the transparent original at a predetermined position is provided, and the CCD crosses the image forming position. By being scanned like
The image on the transparent original is read. Therefore, the entire image reading device becomes very large. Further, the optical system for reading the image of the reflection original including the projector becomes very large and the cost becomes high. Further, it is necessary to separately provide a lens for forming an image of the transparent original and the reflective original, a reflection mirror, etc., which increases the cost of the scanning optical system.

In this respect, according to the image reading apparatus disclosed in Japanese Patent Laid-Open No. 9-191368, the reflective original is conveyed across the optical path for reading the reflective original. Therefore, in that a part of the scanning optical system of the reflective original can be used,
The cost in the scanning optical system does not increase. However, it is necessary to provide a film placing section for placing the transparent original and convey the placing section to the optical path of the optical system, which complicates the mechanism for that. Further, since the transparent original is simply placed on the film placing portion and the film of the transparent original is not held, problems such as dropping and misalignment remain.

Further, according to the image reading apparatus disclosed in Japanese Patent Laid-Open No. 6-86020, since the transparent original and the reflective original can be commonly placed at the positions to be optically scanned, a troublesome operation of placing the original can be performed. The solution is as explained.
However, two reading units including CCDs for reading the transmissive and reflective originals are required, which increases the cost. Further, since the two individual reading units are provided, the size of the entire apparatus becomes large. In particular, since it is necessary to dispose the reading unit with the document table sandwiched between them, the vertical size is inevitably high, and it is not possible to make the apparatus smaller or thinner.

As described above, in the conventional apparatus for reading the image of the transmissive and reflective originals, the entire image reading apparatus is inevitably large. Further, the image reading device cannot be made thin. Further, since the scanning optical system for reading and scanning an image is not shared in common, the apparatus cannot be downsized as described above, and the cost is inevitably high.

Therefore, in the case where a reading unit is shared and reading / scanning of a reflective or transparent original is performed on the same side, the method described in Japanese Patent Laid-Open No.
As described in JP-A-9-191368 and JP-A-6-315067, it is necessary to devise a scanning optical system for forming respective images on the light receiving surface of the same CCD. Therefore, the scanning optical system becomes large in size, and the position of the document to be set is different, which is very troublesome and the work cannot be eliminated. Moreover, the image reading apparatus disclosed in Japanese Patent Laid-Open No. 6-86020 cannot be made compact and thin, as is common to the image reading apparatus.

The present invention also provides an image reading device which can be made smaller or thinner by the image reading device.

In particular, a first object of the present invention is to make it possible to optically scan a transparent original and a reflective original on the same original table so that the apparatus can be made smaller or thinner.

An object of the present invention is to read an image by a transparent original and a reflective original by using the same scanning optical system, the same reading unit, and the same surface side. It is to provide a device, that is, a scanner.

[0020]

SUMMARY OF THE INVENTION An image reading apparatus according to the present invention for achieving the above-mentioned object has one side end for pressing a document placed on a transparent document table against the document table.
The document cover is pivotally supported so that it can be opened and closed with the section as a fulcrum.
Then, in the image reading apparatus configured to optically scan and read the image of the original on the original table, the original table is provided with an area for mounting a reflective original and a transparent original, and the original cover is provided. Press to push the reflection document toward the document table.
The diffuser plate is provided with member and the region for disposing the transparent original in the corresponding position, provided the scanning optical system for scanning the reading of the image of the document, to disposing the reflecting original of the document table
That region and, the scanning light and an area for disposing the transparent original
While scanned by Manabu system, when scanning the territory <br/> region for placing the transmission document, the document reflecting member through which light enters the exposure lamp provided in the scanning optical system side in the diffusion plate It is placed on one side of the diffuser plate of the cover, and
The scanning optical system includes a first support supporting the exposure lamp.
Run the image of the reflection document or the transmission document with the holding part.
A second support portion that supports the reflection mirror to be inspected,
The first support part and the second support part can be separated from each other.
For this purpose, a separate structure is used to read the area where the transparent original is placed.
At the time of scanning, the exposure lamp of the first support section causes the original cover to move.
The first support portion at a position facing the reflecting member on the bar side.
Of the transparent original is stopped by moving only the second supporting portion.
By moving along the area where the
The feature is that the image of the draft is read .

With this structure, the scanning optical system for reading and scanning the reflective original and the transparent original can be shared. That is, in the case of the reflected original, the light from the exposure lamp can be applied to the original on the original table, and the reflected light can be read by the reading unit. In the transparent original, the light from the exposure lamp can be incident on the diffuser plate, and the diffuser plate is used to illuminate from the back surface of the transparent original, so that the transmission light from the transparent original can be read. Therefore, it is possible to perform reading with the same scanning optical system without providing areas for setting the reflective original and the transparent original at different positions, and it is possible to reduce the size or thickness of the entire apparatus. Moreover, the work of placing the original becomes easy.

Further , when the image reading and scanning of the transparent original is performed, the light of the exposure lamp can be efficiently guided to the diffusion plate because the first supporting portion is stopped. Then, the second support portion is scanned along the transparent original. Therefore, the back surface of the transparent original is uniformly illuminated by the diffusion plate, and the transmitted light transmitted through the transparent original is read. Therefore, the image of the transparent original can be read well. Moreover, the same exposure lamp can be effectively utilized.

Further, in the image reading apparatus having the above-mentioned structure, the first supporting part and the second supporting part of the scanning optical system are connected by a connecting means so that they can be integrally scanned when the reflective original is scanned. The first and second connecting means are connected to each other when scanning the area on which the transparent original is placed.
Above connecting rod fixed to the first support portion so that the second supporting part in stopping the support unit can travel by itself and separated
The second support part is movably provided , and a biasing means is provided for biasing the second support part in the direction of closely contacting the first support part. When the first support part is stopped, With the configuration in which the second support portion is provided so as to move with respect to the connecting rod against the biasing means,
The exposure lamp and the reflection mirror can be reliably integrated and separated, and as described above, the scanning when the transparent original is read by the reflection mirror can be favorably performed.

Furthermore, in the image reading apparatus having the configuration described above, the upper Symbol platen, disposing the transparent original Ryo
White balun for correction to make it possible to distinguish the range
Is provided, and the white balance plate for correction is
It is placed at the position before scanning and scanning the transparent original, and
A reference edge that aligns one end of the transparent original is provided.
As a result, the transparent original can be easily placed. Moreover, the placement position of the transparent original can be made accurate. Further, the white balance plate can also perform shading correction for the read data of the transparent original.

Further, in the image reading apparatus having the above-mentioned structure, the reflecting member provided on the document cover is provided on a part of the diffusion plate provided on the document cover side or on the document cover side. If a part of the pressing member is used, it is not necessary to separately provide a reflecting member on the document cover. Therefore, the positioning accuracy when the reflecting member is provided is not required, and thus the efficiency of making the light of the exposure lamp enter the diffusion plate can be improved. In addition, cost reduction can be achieved.

In the image reading apparatus having the above-mentioned structure , the first document cover which is the document cover is
Separately, a second manuscript cover is provided which includes a pressing member for pressing the reflective manuscript to the manuscript table, including a region where the reflective manuscript and the transparent manuscript are placed on the manuscript table .
The image reading on the 1st document cover and the 2nd document cover
An insertion rod that can be inserted into one end of the main body of the
If one of them is configured to be attachable to the image reading device, it can be used as a reading area of a reflective original including the area on which a transparent original is placed. This is a peculiar effect that can be read by the same document table and the same scanning optical system. Therefore, when reading an image of a very long original, the image can be read by scanning once. In this regard, if conventional, to read by twice optical scanning first half and the second half of the reflective original. Then, it is necessary to perform a process of combining the respective read data and combining them. For this reason, work for placed on the document table to distinguish between the first half and the second half of the long document is required, the reading time of the whole, including the time for placing a document is very long. However, according to the present invention, the placing work is performed only once, and the reading scanning is also performed only once, and the reading time is greatly shortened.

Finally, in the image reading apparatus having the above-described structure, the area for mounting the reflective original and the area for mounting the transparent original are attached to the second supporting portion for scanning by the scanning optical system. And a traveling member for driving the second support portion to travel.
By arranging it at a position and arranging it at a position close to the traveling member, the second supporting portion separated from the first supporting portion is twisted in the image reading scanning of the transparent original, and the optical axis of the scanning optical system is It can be prevented from shifting. That is, when the second support portion travels via the traveling member, the second support portion travels in a well-balanced manner, so that the reflection mirror provided on the second support portion does not tilt and stable scanning is possible.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the internal structure of a scanner which is an image reading apparatus according to the present invention. FIG. 2 is a perspective view showing a configuration example of the first scanning means according to the present invention for optically scanning the image of the original.

The scanner shown in FIG. 1, that is, the image forming apparatus is shown as a single scanner. According to the digital copying machine, this scanner is permanently installed in the upper part of the main body of the copying machine, and for example, the main body of the image forming apparatus is installed in the lower part. Similarly, it is permanently installed in the facsimile machine. Further, the personal computer is connected via a communication cable or the like, the image of the original is read on the scanner side based on the reading command, and the read image data is sent to the personal computer.

First, the structure of the image reading apparatus according to the present invention will be described with reference to FIG. The main body of the scanner 1 which is an image reading device is provided with an original cover 2 which can be opened and closed. The original cover 2 is opened and closed in correspondence with an original table 3 which constitutes an original placing portion made of transparent glass or the like on the upper side of the scanner 1, and one side end 4 thereof is located on the upper main body side of the scanner 1. It is pivotally supported.

The manuscript cover 2 is provided with a white pressing sheet on the surface facing the manuscript table 3 on the exterior formed of resin or the like. The white pressing sheet is a pressing member 21 made of, for example, a sponge member. It is pasted on. Therefore,
By closing the manuscript cover 2, the manuscript placed on the manuscript table 3 can be pressed against the surface of the manuscript table 3 by the action of the pressing member 21 and brought into close contact therewith.

The original table 3 is integrated so as to have an area in which the reflective original 5 and the transparent original 6 can be placed separately. That is, the document table 3 is composed of one transparent glass plate and is held on the upper portion of the scanner 1 main body. An area on the left side of the document table 3 in the image scanning direction is an area on which the reflective original 5 is placed, and a left end portion thereof has a reference edge 3a on which the original 5 is placed. A white balance plate 7 for shading correction of the reflection original is provided on the surface of the original table 3 below the reference edge 3a.

On the right side of the document table 3 in the image scanning direction,
A transparent document 6 is placed on the mounting area, and a reference edge 3b for aligning one end of the transparent document 6 is formed on the left side of the area, and a white balance plate 8 for shading correction of the transparent document is attached. ing. Therefore, the document table 3 is divided into a mounting region of a reflective document and a mounting region of a transparent document so as to distinguish them from each other along the scanning direction of the scanning optical system described below.

Corresponding to the original table 3, the original cover 2 is
As described above, the reflection original 5 is pressed from above and the original table 3 is pressed.
A pressing member 21 having a sponge structure is provided to bring the pressing member 21 into close contact with the surface. A white sheet is attached to the surface of the pressing member 21 facing the original table 3. Pressing member 21
Is formed to be slightly larger than the maximum readable reflective original 5, for example, A4 size in the longitudinal direction. Further, a diffusion plate 22 for irradiating light from the back surface of the transparent original 6, that is, the surface opposite to the surface facing the original table 3 is fixed to the original cover 2 in the area corresponding to the transparent original 6. Has been. A reflecting mirror 23, which constitutes a reflecting member for allowing the light from the light source to enter from one side surface of the diffusing plate 22, which will be described later in correspondence with the diffusing plate 22, is also fixedly arranged on the original cover 2 side. ing.

Since the original cover 2 is pivotally supported on the one end 4 of the scanner 1 main body as described above, the original cover 2 is pivoted in the upper right direction in FIG. In this state, when the original table 3 is exposed and the transparent original 6 is read, the original 6 is placed so that one side edge of the original 6 is aligned with the reference edge 3b. Further, when the image of the reflective original 5 is read, the original 5 is placed so that one end of the original 5 is aligned with the reference edge 3a. When the document cover 2 is closed in this state, the documents 5 and 6 are brought into close contact with the document table 3.

On the other hand, a scanning optical system 9 for reading an image of the placed original 5 or 6 is provided in the main body of the scanner 1 below the original table 3. The scanning optical system 9 is of a known type, and reflects an exposure lamp 90 that irradiates an original with light and reflected light from the original to form an optical path to a CCD 11 that is a 1-line image sensor that constitutes the reading unit 10. A plurality of reflecting mirrors 91, 92, 93 are provided.

The scanning optical system 9 comprises a first scanning member 94 and a second scanning member 95 separately. Then, with respect to the scanning speed V of the first scanning member 94, the scanning speed of the second scanning member 95 is set to V / 2, and each is driven and scanned.

As described above, the first scanning member 94 guides the reflected light or the transmitted light from the exposure lamp 90 and the original to the necessary optical path, especially to the light receiving surface of the CCD 11 of the reading unit 10. Is held. The second scanning member 95 holds a pair of second and third reflecting mirrors 92 and 93 that reflect the reflected light from the first reflecting mirror 91 to the light receiving surface for the CCD 11.

The first and second scanning members 94 and 95 are
For example, in order to scan from the left side to the right side of the home position in FIG. 1, it is movably supported by, for example, two slide shafts arranged in parallel, which are not shown. The slide shafts are arranged in the left-right direction in FIG. The first and second support members 94 and 95 are connected to a traveling member 96 including a wire, a timing belt, etc., for traveling driving.

Here, as the mechanism for driving the traveling member 96 for driving and driving the first scanning member 94 and the second scanning member 95, a conventionally known mechanism is used as it is. Since the mechanism itself is not directly related to the present invention, its explanation is omitted. As described above, when the first scanning member 94 travels through the traveling member 96 at the speed V, the second scanning member 9 moves.
5 is a traveling member 96 at a speed of V / 2 with respect to the speed V.
The traveling member 96 is stretched so that the traveling member 96 can be traveled via the first and second scanning members 94,
It is attached to 95.

The reading unit 10 is also a CCD 11 which is a one-line image sensor as described above, and a CCD 11 which receives an optical image from the original 5 or 6 by the scanning optical system 9 described above.
Imaging lens 12 for forming an image on the light receiving surface of the CCD 1, CCD 1
1 is fixed and is electrically wired. On the substrate 13, a circuit for converting an analog signal for each pixel according to the amount of light read from the CCD 11 into a digital signal as necessary and outputting it as image data is wired.

When the reflection original 5 is placed with its one end aligned with the reference position 3a of the original table 3 as described above, the original cover 2 is closed. The state is as shown in FIG. Therefore, the scanner 1 main body starts the reading operation by operating the reading command from the personal computer or operating the reading start switch on the operation panel of the scanner 1 main body. At this time, reading scanning by the scanning optical system 9 is started. Therefore, the exposure lamp 90 is turned on, and the image of the document 5 is sequentially formed on the CCD 11 of the reading unit 10 by optically scanning along the reflection document 5. That is, the first scanning member 94 moves at the speed V, for example, by the traveling member 96.
Will be driven through. Then, the second scanning member 95 travels in the same direction at a speed V / 2 via the travel member 96.

As a result, the reflected light from the reflective original 5 by the light irradiation from the exposure lamp 90 is imaged on the CCD 11 by the imaging lens 12 via the respective reflection mirrors 91, 92, 93 of the scanning optical system 9. To go. As a result, the image of the entire area of the reflective original 5 is sequentially optically scanned and read by the CCD 11.

(First Embodiment of the Invention) As described above, the scanning in which the reflection original 5 is sequentially read in FIG. 1 is the same as the conventional scanning. Therefore, in the first embodiment of the present invention, the reflective original 5 is also included in the transparent original 6.
Similarly, so that it takes a read by scanning the same scanning optical system 9 and.

In FIG. 1, the first scanning member 94 which constitutes the scanning optical system 9 is a lamp carriage 94a which is a first supporting portion which supports the exposure lamp 90, and a second supporting portion which supports the reflection mirror 91. It is composed of a mirror carriage 94b. The lamp carriage and the mirror carriages 94a and 94b are separable from each other, and are normally connected by a connecting member 15 to be in an integrated state.

As shown in FIG. 2, the connecting member 15 is provided with a mirror carriage 94b movably with respect to connecting rods 16 provided at both ends thereof, and one end of the connecting rod 16 is a lamp carriage 94a. It is fixed to. A flange 17 is fixed to the other end of the connecting rod 15, that is, an end opposite to the fixed end of the lamp carriage 94b, and a compression spring 18 is interposed between the flange 17 and the mirror carriage 94b. There is. Therefore, the biasing force of the compression spring 18 causes the mirror carriage 94 to move.
b is brought into close contact with the lamp carriage 94a. for that reason,
Since a part of the traveling member 96 is fixed to the side of the mirror carriage 94b, the lamp carriage and the mirror carriages 94a and 94b integrally move in the same direction at the same speed on a slide shaft (not shown).

Further, the lamp carriage 94a side, the locking projection 19 for stopping holding the Ranpukyari' di 94a at a position outside the exposure area of the both ends are fixed. Corresponding to the locking projection 19, a stopper 20 is provided on the scanner 1 main body side as shown in FIG.

Therefore, the first scanning member 94 is the traveling member 96.
If it travels on the slide shaft via the first scanning member 9
The locking projection 19 provided on the lamp carriage 94a constituting the stopper 4 is provided on the stopper 2 provided on the scanner 1 main body side.
Abut 0. In this locked state, the first support portion 94
The exposure lamp 90 provided in a faces the reflection mirror 23 provided in the original cover 2. When the first scanning member 94 is further driven rightward through the traveling member 96, the movement of the lamp carriage 94a is blocked by the abutment of the locking projection 19 and the stopper 20, so that the mirror. The carriage 94b further moves rightward against the biasing force of the spring 18. Therefore, the transmitted light from the transparent original 6 placed on the original table 3 is transmitted by the first reflecting mirror 91.
It is reflected at and can perform optical scanning.

In the scanner 1 having the above structure,
On the same surface of one of the document table 3, Ru can place the reflective original 5 and the transparent original 6. Moreover, by driving and scanning the same scanning optical system 9, the images of the reflective original 5 and the transparent original 6 can be scanned and read, so that the height of the scanner 1 is suppressed in the height direction, and the scanner 1 is downsized. Thinning is possible. Further, since the image can be read by the same scanning optical system 9 and the reading unit 10, the mechanism is simplified, the number of parts is suppressed, the size is reduced, and the cost is reduced.

Therefore, the scanner 1 having the above-mentioned configuration
In order to deepen the understanding, the reading operation of the image of the reflective original 5 and the transparent original 6 will be described below.

First, the case where the image of the reflection original 5 is read will be described. The document cover 2 is opened, and one end of the reflection document 5 is placed with the reference edge 3a of the document table 3 aligned. After placing, the original cover 2 is closed from the top. In this state, the start of reading scanning is commanded. This command is issued by the scanner 1
It is a start switch on the operation panel of the main body, a start command from a personal computer, or a copy start switch in a digital copying machine. When the control means (CPU) (not shown) receives this command, the scanning optical system 9 is driven.

Therefore, the traveling member 96 is driven and the first member
The second scanning members 94 and 95 are moved at a predetermined speed. At this time, the first and second scanning members 94 and 95 travel from a predetermined home position and travel for a certain distance, so that reading and scanning is started from the leading edge of the image on the reflective original 5. Then, before the image reading scanning of the reflective original 5 is started, the white balance plate 7 is optically scanned first. By this scanning, the CCD 1 of the reading unit 10
One individual output state is identified and stored.

The reason why the white balance plate 7 is read in advance is to correct sensitivity unevenness of each read cell of the CCD 11, uneven light amount of the exposure lamp 90, unevenness of the lens 12, and the like, so-called shading correction. Used for.
The reading result by the white balance plate 7 is temporarily stored in a storage unit such as a RAM (not shown) as shading correction data.

Then, by starting the scanning of the position of the reference edge 3a, the image reading scanning of the reflection original 5 is started.
The reading result is sequentially stored in a memory or the like arranged on the substrate 13 as image data output via the CCD 11 of the reading unit 10. In this case, although the description will be mixed up, the first scanning member 94 is provided with the lamp carriage and the mirror carriages 94a and 94b, which are the first and second supporting portions, in a separable manner. Since they are in close contact with each other, they travel together.

When such scanning continues and the scanning of the rear end of the reflection original 5 is completed, the read image data for one page of the reflection original 5 is stored, and if necessary, output processing is performed to an external device. It If the size of the reflection original 5 placed in advance has been determined, the rear end of the reflection original 5 has the first scanning member 94.
Is determined, and the scanning of the scanning optical system 9 is stopped when the vehicle travels the distance. Then, the scanning optical system 9
The vehicle is returned to the original home position in the opposite direction. The speed at this time is usually set higher than the speed at the time of reading.

The read data output from the above-mentioned CCD 11 is stored for correction during reading of the white balance plate 7 as described above in order to carry out shading correction for correcting unevenness and light amount unevenness for each read cell. The data is subjected to division processing, and output processing is performed as clear image data from which the above-mentioned unevenness is removed. In this process, when the image data for one page is stored and then output to another external device or the like, shading correction is performed and the image is output. Or
Shading correction processing is performed on the read data for one line by the CCD 11 each time, and the shading correction processing is stored in a memory or the like.

The image reading scanning of the reflection original 5 is completed as described above. Next, described image reading scan of the transparent original 6. Therefore, the transparent original 6 is placed in the transparent original placing area on the original table 3. Therefore, the original cover 2 is opened, and one end of the transparent original 6 is placed in alignment with the reference edge 3b which is also the end of the white balance plate 8. After placing, the original cover 2 is closed.

In this state, the start of reading scanning is commanded. This command is as described above, and is a start switch on the operation panel of the scanner 1 main body, a start command from a personal computer, or a copy start switch in a digital copying machine. When the control means (CPU) (not shown) receives this command, the scanning optical system 9 is caused to run. The driving of the scanning optical system 9 is the same as the driving of the reading and scanning of the reflective original 5 except that the reflective original 5 is driven.
Since the image reading is not performed, the moving traveling of the mounting area of the reflective original is driven at high speed.

When the scanning optical system 9 approaches the scanning area of the transparent original 6, the traveling speed for scanning the transparent original 6 is controlled. As a result, the reading time of the transparent original 6 can be shortened. Therefore, the moving distance of the scanning optical system 9 can be accurately grasped by counting the rotation angle of the drive system, for example, the motor, that is, the output pulse from the speed encoder. Then, particularly the first scanning member 94 of the scanning optical system 9 is the transparent original 6
Velocity is transmitted when a certain distance is reached before the start of scanning
The scanning speed of the original is controlled. Alternatively, it is acceptable to place the micro switch or the like (not shown) before the hand of the reading scanning area of the transparent original 6, using the detection signal of the microswitch, the first scanning member 94 of the scanning optical system 9, reading of transparent original Control the scanning speed.

In this way, when the scanning optical system 9 is driven to drive and the scanning of the transparent original 6 is started, the lamp carriage 94a constituting the first scanning member 94 is locked as shown in FIG. The protrusion 19 contacts the stopper 20. At this time, the lamp carriage 94a is prevented from further movement and is stopped and held at that position. Then, the exposure lamp 9 supported by the lamp carriage 94a
0 is stopped in a state of facing 0 to the reflection mirror 23 provided on the document cover 2 side. Therefore, the exposure lamp 90
Light is reflected by the reflection mirror 23 and guided to the diffusion plate 22.

As is well known in the art, the diffuser plate 22 is adapted to irradiate incident light uniformly over the entire area of the mounting surface of the transparent original 6, for example. Therefore, the transparent original 6 including the white balance plate 8 is uniformly illuminated from the back surface.

As a result, at the position where the lamp carriage 94a is stopped by the stopper 20, the first reflection mirror 91 by the mirror carriage 94b reflects the transmitted light from the white balance plate 8 and the reading unit 10 has the same structure. It is at a position where an image is formed on the light receiving surface of the CCD 11. Therefore, the output of the CCD 11 by the white balance plate 8 is stored as correction data for shading correction.

After that, when the mirror carriage 94b is further moved and scanned rightward through the traveling member 96, it is separated from the lamp carriage 94a and travels along the connecting rod 16 against the compression spring 18. As a result, the transmitted light is sequentially reflected by the first reflecting mirror 91 in a state where the transparent original 6 is irradiated with light through the diffusion plate 22. The transmitted light is reflected by the second and third reflection mirrors 92 and 93 held by the second scanning member 95, and is imaged on the CCD 11 of the reading unit 10 via the imaging lens 12. In this case, the second scanning member 95 travels in the same direction at a speed of 1/2 because the mirror carriage 94b is driven to travel.

By forming an image on the CCD 11 described above,
An output corresponding to the optical image is output from the CCD 11. The output read data is subjected to a division process and the like with the correction data by the white balance plate 8 as described above in order to perform shading for correcting unevenness and uneven light amount of each read cell of the CCD 11. Output processing is performed. In this processing, after the image data of one transparent original 6 is stored, when the output processing is performed to another external device or the like, the shading correction described above is performed and output. Alternatively,
Shading correction processing is performed on the read data for one line by the CCD 11 each time, and the shading correction processing is stored in the memory or the like.

When the reading scan of the transparent original 6 is completed in this way, the return drive is similarly performed at the end of the reading scan of the reflective original 5. In this return drive, the reflection original 5
Similarly, the return drive traveling is performed faster than the drive speed by the reading and scanning. In this case, the mirror carriage 94b is urged in the returning direction by the action of the compression spring 18 and is returned as the first scanning member 94 including the lamp carriage 94a in a state of being in close contact with the lamp carriage 94a.

As described above, optical scanning for image reading by the reflective and transmissive originals 5 and 6 can be performed by the same scanning optical system 9 and the reading unit 10. Here, when reading and scanning the reflective original 5 and the transparent original 6, the reading mode, that is, the reflective original reading mode and the transparent original reading mode are switched and set. The mode switching is preset before scanning. As described above, the reading mode of the reflective original 5 is usually set, and the scanning optical system 9 is moved to the mounting area of the transparent original 6 when the transparent original 6 is read.

Therefore, the time when the lamp carriage 94a forming the first scanning member 94 moves to the position of the stopper 20 and the locking projection 19 abuts and the movement is blocked is detected. Therefore, a detection sensor or the like is arranged at the position of the stopper 20. Then, the locking projection 19 is made to operate the detection sensor, and the detection signal at that time is output. By using the detection signal, it is possible to automatically switch and set the reading mode of the transparent original. Therefore, the operator does not need to switch the mode.

Moreover, the state of the original placed on the original table 3 is normally detected. If such conventionally known document detecting means is provided, the mode according to the detection can be automatically switched and set. That is, when the transparent original 6 is placed on the original table 3, the original detecting means detects it. In response to this detection, the scanning optical system 9 is scanned up to the scanning area of the transparent original 6. Then, when it is detected at the position of the stopper 20, it is possible to perform switching control to the transparent original reading mode.

(Other Uses According to First Embodiment) In the image reading scan of the above-mentioned original, the reflective original 5 or the transparent original 6 is separately read and scanned. Therefore, when it is necessary to read the reflective original 5 and the transparent original 6 together, the reflective original 5 and the transparent original 6 are placed on the original table 3 in their respective areas. Then, the original cover 2 is closed, and when a start command is issued, the scanning optical system 9 starts reading and scanning.

First, before the image reading scanning of the reflection original 5 is performed, the correction data for the shading correction by the white balance plate 7 for the reflection original 5 is read and stored, and the shading correction is performed by reading the image of the reflection original 5. Then, the read image data is output. Following this, the image reading scanning of the transparent original 6 is started. Before that, similarly, the transparent original white balance plate 8 for shading correction is read to store the correction data, and then the reading scanning of the transparent original 6 is started. At this time, when the traveling of the lamp carriage 94a that constitutes the first scanning member 94 of the scanning optical system 9 is blocked by the stopper 20, this is detected and the mode is automatically changed from the reflective original reading mode to the transparent original reading mode. Can be switched.

Then, the scanning of the image of the transparent original 6 is performed, and based on the previously read shading correction data,
The read image data subjected to shading correction is output. In this way, by scanning the reflective original 5 and the transparent original 6 once by the scanning optical system 9, it is possible to continuously read images of different originals.

In this way, the reflection original 5 and the transparent original 6 are combined into one.
Since the scanning can be continuously performed by one reading scan, the black and white binary mode is set for each reflective original 5 and transparent original 6 before the reading scan.
Set the color mode, gray mode (halftone / photo), resolution, brightness, reading range, etc. As a result, in the scanning scan of the reflective original 5 or the transparent original 6, the image can be read in the set mode. Also,
These switchings are determined in the scanning areas of the reflective original 5 and the transparent original 6 as described above, and the switching is performed accordingly. As a result, the separate scanning of the reflective original 5 and the transparent original 6 saves the trouble of setting the mode each time, and the total reading scanning time can be greatly shortened.

(Another Mode According to First Embodiment) In the first embodiment of the present invention shown in FIG. 1, a reflecting mirror 23 is separately provided for reading and scanning the image of the transparent original 6. With the reflection mirror 23, the light from the exposure lamp 90 supported by the lamp carriage 94a forming the first scanning member 94 is used for illuminating the transparent original 6. Therefore, a special exposure lamp for illuminating the transparent original 6 is not required. Therefore, the main body of the scanner 1 can be made smaller and thinner.

Apart from such a form, the reflection mirror 23
FIG. 3 shows a mode in which the reflecting mirror 23 is not provided by simultaneously providing the diffusing plate 22 with the above reflecting function.
That is, the reflection plate 22a that functions as a reflection member integrally formed with the diffusion plate 22 is formed. Reflector 22a
By integrally molding with the diffusing plate 22, it is possible to provide a reflecting function and a diffusing function with one member.

Therefore, since one member can fulfill both functions described above, the accuracy of the incident angle of the light from the exposure lamp 90 to the diffusion plate 24 can be improved. That is, positioning accuracy and the like when the reflection mirror 23 is separately attached and fixed to the original cover 2 are required, but such accuracy is not necessary, and the accuracy is improved. As a result, the reading quality at the time of scanning the transparent original 6 is also improved. A reflection sheet or the like may be attached to the reflection surface of the reflection plate 22a.

Further, in FIG. 4, the reflecting mirror 2 for making the light of the exposure lamp 90 enter the diffusion plate 22 as described above.
It is configured such that the reflection original 5 constituting the original cover 2 is also used as the pressing member 21 that presses the original table 3 without separately providing 3. That is, the pressing member 21 is provided to press the reflection original 5 against the original table 3. The pressing member 21 is provided with a white sheet that reflects the light from the exposure lamp 90. Using the reflection of this white sheet, the light from the exposure lamp 90 is diffused by the diffusion plate 22.
Can be incident on.

Therefore, as shown in FIG. 4, the pressing member 21 is integrally provided with a reflecting portion 21a formed in a curved shape, for example, in a portion outside the maximum size area. A reflective sheet having a higher reflection efficiency than that of the white sheet may be separately attached to the reflective surface of the reflective portion 21a. Further, the reflecting portion 21a is formed in a curved shape, but this is also for the purpose of efficiently allowing the light from the exposure lamp 90 to enter the diffuser plate 22, and is thus focused. Further, when a sufficient amount of incident light can be secured, it may be formed in an inclined state.

By providing this reflecting portion 21a, the expensive reflecting mirror 23 is not required, and the exposure lamp 9 can be manufactured at low cost.
The light of 0 can be made incident on the diffusion plate 22.

(Second Embodiment of the Present Invention) According to the first embodiment described above, the document cover 2 is provided with the reflection document 5.
The pressing member 21 is set so as to press the transparent original 6 on the original table 3 so that the transparent original 6 can be read, for example, in the longitudinal direction of A4 size. Then, the transparent original 6 is placed corresponding to the subsequent area of the original table 3.
A diffusion plate 22 is provided on the original cover 2 side so as to correspond to the placement area of the transparent original 6.

Such an original cover 2 can be detachably attached to one side end of the main body of the scanner 1, and an original cover 2a as shown in FIG. In other words, there is only one document table 3,
The scanning optical system 9 is also movable along the document table 3.

Therefore, as shown in FIG. 5, a reflection original 5a longer than A4 size, for example, a legal size can be placed on the original table 3 and read. The length of the legal size in the longitudinal direction is 355.6 mm, and the length of the A4 size in the longitudinal direction is 297 mm.

The original cover 2 shown in FIG.
The document cover 2a having the structure shown in FIG. The document cover 2a is provided with a pressing member 21b that can uniformly press the entire area of the legal-size reflective document 5a when it is placed on the document table 3. As shown in FIG. 1, the original cover 2a has a diffusion plate 22 corresponding to the transparent original 6.
The above-mentioned pressing member 21b is provided so as to extend so as to extend to the attachment position without attaching.

In the scanning optical system 9, the lamp carriage 94a constituting the first scanning member 94 is stopped at the position of the stopper 20a due to the abutment of the locking projection 19, and only the mirror carriage 94b has the lamp carriage 94a. Since the separated originals are run in a separated state, for example, the legal size reflection original 5a cannot be sufficiently irradiated with light. Therefore, the stopper 20a is attached to the lamp carriage 9
The lamp carriage 9 can be separated from the scanning area 4a.
4a is not separated from the mirror carriage 94b,
Run in close contact.

Therefore, as shown in FIG. 5, the stopper 20a is connected to a lever 20b pivotally supported,
Locking protrusion 19 provided on the lamp carriage 94a
It is getting farther away. This stopper 20a is
By attaching the document cover 2a to the main body of the scanner 1,
It is configured to rotate in the direction of arrow G in conjunction with this, so that the function as the stopper 20a is not fulfilled. Alternatively, the stopper 2 may be provided on the original cover 2a side.
A member for rotating 0a in the G direction is provided correspondingly,
The stopper 20a may be configured to rotate with the document cover 2a closed.

Further, in FIG. 1, it is described that the white balance plate 7 is provided on the original table 3 in the area where the transparent original 6 is placed. If the white balance plate 7 is provided on the diffusion plate 22 side, the white balance plate 7 does not exist on the original table 3. Therefore, even if the document cover 2a having the configuration shown in FIG. 5 is attached to the scanner 1 main body, the long reflection document 5 can be read.

In the above structure, the read original is
When the image of the reflection original 5a longer than the A4 size is read, the original cover 2a as shown in FIG. 5 is replaced with the original cover 2 having the structure shown in FIG. Then, the long reflective original 5 a is placed on the original table 3. If one end of the reflection original 5a is placed in alignment with the reference edge 3a, the rear end opposite to the one end will extend to the placement area of the transparent original 6 in FIG. Then, when the document cover 2a is closed and a reading start command is issued, the scanning optical system 9 is driven to travel.

The scanning optical system 9 includes the first scanning members 94 and 9
5 travels at respective speeds in the directions of the arrows shown in FIG. Since the lamp carriage and the mirror carriages 94a and 94b are connected by the connecting member 15, the first scanning member 94 travels integrally. As a result, the light of the exposure lamp 90 irradiates the reflective original 5a, and the reflected light becomes the first
The vehicle travels while being reflected by the reflection mirror 91.

The scanning speed of the first scanning member 94 is 1
The second scanning member 95, which is driven to travel at a speed of / 2, causes the light reflected by the second and third reflecting mirrors 92 and 93 to be reflected by the reflecting mirror 91 via the imaging lens 12 to be read by the reading unit 10. It leads to CCD 11 of. This allows CCD1
From 1, the read image data corresponding to the density of the reflection original 5a is output.

Continuing the above-mentioned scanning, the first scanning member 94
Is the position of the stopper 20a, that is, the lamp carriage 94
Even if the locking projection 19 of a reaches the position of the stopper 20a,
The stopper 20a is rotated to the state shown by the broken line. Therefore, the traveling of the lamp carriage 94a is not restricted, and the scanning is continued in a state where it is integrated with the mirror carriage 94b. After that, as shown in FIG. 5, the first reflection mirror 91 supported by the mirror carriage 94b scans the rear end position of the reflection original 5a.

In this way, when the scanning of the rear end of the reflection original 5a longer than the normal size (for example, A4 size) is completed, the scanning optical system 9 is returned to the original home position. That is, the vehicle is driven in the opposite direction to the scanning direction. Therefore, when performing image reading long reflection original. 5a, by effectively utilizing the entire area of the platen 3, thereby enabling the reading. This is something that the prior art could not do, and is possible only when the present invention is implemented. Further, this does not increase the size of the scanner 1 main body.

An example of a structure in which the original cover 2 is detachably attached to the scanner 1 main body will be described. this is,
It is an example, and the present invention is not particularly limited thereto. The document cover 2 is pivotally supported at one end 4 so that the document cover 2 can be opened and closed. Then, one end portion 4 of the document cover 2 is pivotally supported by the pivotal support portion 1a of the scanner 1 main body. The shaft support 1a can be attached to and detached from the scanner 1 main body. That is, the insertion rod 1b provided on the shaft supporting portion 1a is provided so as to be attachable to the exterior 1c of the scanner 1 main body.

(Other Embodiments of the Present Invention) As described above, according to the scanner 1 according to the first embodiment shown in FIG. 1, the same document table 3 is used and the same scanning optical system 9 is used. , The reflective original 5 and the transparent original 6 using the reading unit 10.
The image can be read. Then, in the scanner 1 according to the second embodiment shown in FIG. 5, the scanner 1 shown in FIG.
Is used as it is to enable the image reading of the long reflection original 5a. Therefore, in the scanner 1 shown in FIG. 1, when the white balance plate 8 is attached to the surface of the document table 3, it becomes an obstacle and the document cover 2
It has been described that it is attached to the diffuser plate 22 side.

In this case, since the image of the transparent original 6 is read as shown in FIG. 1, it is not possible to determine the position on the original table 3. Therefore, it is advisable to provide a scale or the like indicating a reference edge for aligning one side edge of the transparent original 6 at a position outside the reading / scanning area of the original table 3. This scale can be provided on the edge of the frame or the like surrounding provided et the to hold the document platen 3.

In the original cover 2 shown in FIG. 1,
An insertion portion made of a transparent film such as the diffusion plate 22 side is provided, by inserting a transparent original 6 from the insertion portion, the transparent original 6
The front end of the white balance plate 8 is aligned with the end of the white balance plate 8 provided on the diffusion plate 22. Document cover 2 in this state
When is closed, the transparent original 6 is pressed against the original table 3 via the diffusion plate 22. Further, the white balance plate 8 is also brought into close contact with the original table 3 so that the transparent original 6 can be optically scanned following the optical scanning by the white balance plate 8.

On the other hand, as shown in FIG. 2, the first scanning member 94 constituting the scanning optical system 9 according to the present invention is connected by the connecting member 15 so that the lamp carriage 94a and the mirror carriage 94b can be separated. . This connecting member 1
5 are provided at both ends. Moreover, the connecting member 15 is provided close to the mounting position of the traveling member 96.

This is because the traveling member 96 uses the first scanning member 9
When the mirror carriage 94b forming part 4 is separated from the lamp carriage 94a to optically scan the transparent original 6, the traveling of the mirror carriage 94b due to the read scanning can be stabilized. In other words, by providing the connecting member 15 in the vicinity of the traveling member 96, the mirror carriage 94b can be moved smoothly along the connecting rod 16, and at this time, the force in the diagonal direction for driving the traveling does not act and the twisting is prevented. it can. Therefore, it is possible to prevent the inclination of the first reflecting mirror 91 and prevent the reading failure due to the deviation of the optical axis.

In the example shown in FIG. 2, the traveling members 96 are attached and fixed to the first scanning member 94, especially on both sides of the mirror carriage 94b, so that the traveling is performed. for that reason,
The connecting means 15 is provided close to each of them. Here, when only one connecting means 15 is provided, in order to secure the stability when the mirror carriage 94b is driven separately from the lamp carriage 94a and to prevent the tilt of the reflection mirror 91 described above, the first The central portion of the scanning member 94, that is, the central portion of the mirror carriage 94b is the connecting rod 1.
The connecting means 15 may be provided so as to be movably supported at 6.

By providing the connecting means 15 in the central portion in this way, when both sides of the mirror carriage 94b of the first scanning member 94 are driven by the traveling member 96, the both sides are balanced and thus twisted. It is possible to prevent the inclination due to the like.

In the various embodiments described above, the running member 96 is composed of members such as wires and timing belts, and is driven by a motor (not shown) which is a driving source. Therefore, the traveling member 96 such as a wire is moved by a motor, which is connected to the first and second scanning members 94 and 95. Therefore, the wire that is the traveling member 96 is stretched over the first and second scanning members 94 and 95 via a plurality of pulleys by a conventionally known method, so that the first scanning member 94 is caused to travel by the motor. For example, the second scanning member 95 travels at 1/2 speed.

Therefore, as shown in FIG. 6, the timing belt, which is the traveling member 96, is stretched by fixing both ends in parallel to the slide shaft that movably supports the first scanning member 94. A drive gear that meshes with the timing belt 96 and a motor that drives the drive gear are provided on the side of the mirror carriage 94b, and the first scanning member 94 can travel at a predetermined speed according to the rotation speed of the drive mora. Then, even if one end is fixed to the first supporting portion 94b side and the wire 98 having the other end fixed to the scanner 1 main body side is stretched via the pulley 97 provided on the second scanning member 95, similarly. First
The second scanning member 95 is driven at a speed half that of the traveling speed of the scanning member 94.

In this way, the lamp carriage and the mirror carriages 94a and 94b can be separated from each other by the connecting member 1
Even if it is configured integrally with 5, traveling drive can be performed in the same manner. Here, the timing belt 96 may be composed of a wire, and the wire 98 may be composed of a timing belt.

The connecting rod 16 of the connecting member 15 is
Of course, the length is set so that the transparent original 6 can be optically scanned.

[0103]

According to the image reading apparatus of the present invention described above, a reflective original and a transparent original can be separately placed adjacently on the same original table, and a scanning optical system is provided for the placement area. The image is read from the reflection original and the transmission original on the same side by the same scanning optical system and the same reading unit. As a result, the image forming apparatus can be downsized or thinned.

In this case, the reading of the reflection original and the transmission original can be performed by one optical scanning, which makes it possible to shorten the reading time.

Further, in the scanning optical system, in the area of the transparent original, the scanning member for the scanning can be partially separated so that the light of the exposure lamp can be irradiated from the rear surface of the transparent original, and the separated partial Since the image can be scanned by the scanning system, the exposure lamp can be shared at the same time, and it is possible to read on the same surface and make it thinner.

If the reflecting member for guiding the light of the exposure lamp to the rear surface of the transparent original when reading and scanning the transparent original is also used as a part of the original cover, the positional accuracy of the reflecting member can be improved. It is possible to improve, and thus the reading of the image becomes good.

Further, since the scanning optical system for scanning the original on the original table performs image reading by the same scanning, if a long reflection original can be placed on the original table, the image of the original can be easily obtained. Can be read.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an internal structure of a scanner which is an image reading apparatus for explaining an embodiment of the invention.

FIG. 2 is a perspective view showing an example of a connecting mechanism that allows a first scanning member that constitutes a scanning optical system to separate and travel in the image reading apparatus in FIG.

FIG. 3 is a diagram for explaining another example of the reflecting member provided on the document cover side in the present invention.

FIG. 4 is a diagram for explaining another example of a reflecting member provided with a document on the cover side in the present invention.

FIG. 5 is a configuration diagram showing an internal structure of a scanner which is an image forming apparatus for explaining a second embodiment of the present invention.

FIG. 6 is a diagram showing an example for driving a scanning optical system to travel.

[Explanation of symbols]

1 Scanner (image reading device) 2 Original cover 21 Pressing member 21a Reflecting part (reflecting member) 22 Diffuser 22a Reflector (Reflecting member) 23 Reflection mirror (reflection member) 3 Platen 5 Reflective original 6 Transparent manuscript 7 White balance plate for reflective originals 8 Transparent original white balance plate 9 Scanning optical system 90 exposure lamp 91 First reflection mirror (scanning mirror) 94 First scanning member 94a Lamp carriage (first support part) 94b Mirror carriage (second support part) 95 Second scanning member 10 reading unit 11 CCD 12 Imaging lens 15 Connection means 16 connecting rod 18 compression springs 19 Locking protrusion 20 stopper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI H04N 1/04 105 H04N 1/10 1/107 (56) Reference JP-A-7-135553 (JP, A) JP-A-10 -65845 (JP, A) JP-A-9-102851 (JP, A) Actual development 5-63156 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 1/04- 1/207 G03B 27/32 G03B 27/42-27/48 G03B 27/50 G03B 27/58-27/64 H04N 1/00-1/00 108

Claims (6)

(57) [Claims] 1. A opens a document placed on a transparent platen as a fulcrum an end for pressing into said platen
In an image reading apparatus in which a document cover is pivotally supported so that the image on the document table is optically scanned and read, a reflection document and a transparent document are placed on the document table. An area for placing the reflection original is pressed on the original cover toward the original table side.
A pressing member and a diffusion plate are provided at positions corresponding to the area on which the transparent original is placed, a scanning optical system for reading and scanning an image of the original is provided, and an area on the original table on which the reflective original is placed. And a region on which the transparent original is placed is scanned by the scanning optical system, and when the region on which the transparent original is placed is scanned,
A reflection member for allowing light from an exposure lamp provided on the scanning optical system side to enter the diffusion plate is disposed on one side surface side of the diffusion plate of the document cover, and the scanning optical system includes the exposure lamp. The first to support
A support part and a second support part for supporting a reflection mirror for scanning the image of the reflection original or the transmission original, and
The first support part and the second support part can be separated from each other.
In order to move the first supporting portion at a position where the exposure lamp of the first supporting portion faces the reflecting member on the side of the original cover when reading and scanning the area where the transparent original is placed, An image reading apparatus characterized in that the image of the transparent original is read by stopping and moving only the second supporting portion along an area where the transparent original is placed. 2. The first supporting part and the second supporting part of the scanning optical system are connected by a connecting means so that they can be integrally scanned when the reflective original is scanned. During scanning of the area on which the transparent original is placed, the second support section is separated when the first support section is stopped.
Fixed to the first support portion so as to be run solely Te
The second support portion is movably provided on the connecting rod, and
A biasing means is provided for biasing the second support part in a direction of closely contacting the first support part, and when the first support part is stopped, the second support part acts as the biasing means. The image reading apparatus according to claim 1, wherein the image reading apparatus is provided so as to move with respect to the connecting rod. 3. A correction white balance plate is provided on the platen for distinguishing regions on which the transparent document is placed, and the correction white balance plate is provided with:
2. The image reading apparatus according to claim 1, further comprising a reference edge which is arranged at a position before the transparent document is read and scanned and which has one end of the transparent document aligned. 4. The reflection member provided on the document cover is constituted by a part of the diffusion plate provided on the document cover side or a part of the pressing member provided on the document cover side. The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. 5. A first original cover which is the original cover.
Separately from the above, there is provided a second document cover provided with a pressing member for pressing the reflection document to the document table, including a region where the reflection document and the transparent document are placed on the document table.
Note that the image on the first document cover and the second document cover
Provided with an insertion rod that can be inserted into one end of the image reading device body,
The image reading apparatus according to claim 1, wherein either one of the image reading apparatus and the image reading apparatus can be attached to the image reading apparatus. 6. The image reading apparatus according to claim 2, wherein an area on which the reflective original is placed and an area on which the transparent original is placed are attached to the second supporting portion for scanning by the scanning optical system. An image reading means is provided with a traveling member for driving the second support portion to travel, the connecting means is provided at at least two places, and the arrangement positions thereof are provided close to the traveling member. apparatus.