JPH11122438A - Picture reading device and picture forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture reading device in which reading with high fidelity can be attained by preventing an original from floating from a glass at the time of placing an original on an original glass, and deformation at the time of pressing the original on the original glass can be reduced. SOLUTION: A stepped dowel 21 of a reinforcing board 20 is matched with the large diameter part of a tumbler opening 11 glass supporting board 10, and allowed to slide to an arrow direction so that they can be integrated. Normally, this device is used with the reinforcing board 20. A butting board 22 is integrally provided at the reinforcing board 20. At the time of placing an original which is larger and harder than the original glass 30 or at the time of placing an original beyond the original glass, this device is used after the reinforcing board 20 is allowed to slide and detached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and more particularly to an image reading apparatus such as a reader for reading an image of a document placed on a document glass, and a copying machine and a printer equipped with the image reading apparatus. And an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, a transparent document glass for placing a document provided on a reading section of an analog copying machine or a reader section for reading an image of an image forming apparatus called a digital copying machine has a heavy document. Or a strong book may be pressed down with a strong force to cleanly read the binding part. Due to this force, the original glass and the structural member supporting the original glass below the original glass are deformed, and may come into contact with a scanning member for reading or an illumination system, or the glass may be broken.

Particularly, in a reading apparatus capable of reading a large-size original such as A1 or A0, the deformation is large even with the same force, and the structural member supporting the original glass needs to have sufficient strength. However, it is necessary to increase the thickness (thickness) in the vertical direction, which is the direction in which the force is applied, but if it is extended downward, it hits the scanning member or the illumination system and extends upward to increase the strength and reduce deformation.

As another method, as shown in FIG.
There is also a method in which the glass 30a is placed on the surrounding structural member, but in this case, the support span is rather long and the glass 30a may be easily deformed. Further, the glass was large and expensive.

[0005]

When the structural member is extended upward, when a document larger than the document glass or a document smaller than the document glass is placed out of the document glass to partially read the document, the document is raised upward from the document glass. The document floated or the document was damaged near the elongated structural member. In particular, when a document was stuck on a styrene board or cardboard, if a structural member was located above the document glass, the document floated, and a clear image could not be obtained due to insufficient light quantity and out of focus. This phenomenon may cause a problem even when the document is slightly floated by a thin plate of about 1 mm fixed by bonding or the like to a surface of a document glass called an abutment plate, which is a reference when placing the document.

Further, as shown in the reader 91 of FIG.
A CCD 92 serving as a reading unit is sent in the main scanning direction to read a minute width, and the information is scanned by the printer of FIG. Therefore, in the image forming apparatus of the type in which the CCD 92 is sent in the sub-scanning direction and the printer sends the paper by the amount written, and the operation is repeated to connect and write the image, An error of only about 15 μm is allowed in each direction, and if the value exceeds this value, the image will not be connected when viewed from a close distance, and the effect will be large. However, manuscript 70
When the CCD floats from the original glass 30, as shown by the solid line and the dotted line in FIG. Under the condition that the original 70 and the original 70 are in close contact with each other, the shading correction is performed so that the density of the rear end of the adjacent line and the density of the front end of the next line do not change.
Floating, the image could not be connected even in terms of density because the conditions of the angle of illumination and the distance between the previous line and the next line were different.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to prevent an original from rising from the glass when the original is placed on the original glass. It is an object of the present invention to provide an image reading apparatus capable of preventing a document from being scanned with high quality and reducing deformation when a document is pressed against a document glass.

[0008]

In order to achieve the above object, the present invention provides an image reading apparatus for placing an original so as to face a transparent plate and reading an image of the original through the transparent plate. A reinforcing member for reinforcing a supporting member supporting the transparent plate is detachably provided.

If the support member is provided with the reinforcing member,
Even if the original is pressed against the transparent plate, the deformation of the transparent plate is reduced, so that the transparent plate and the supporting member are deformed and come into contact with the reading means and the illumination system provided in the image reading device main body, or the transparent plate itself Can be prevented from being damaged. In addition, by providing such a reinforcing member in a detachable manner, when the reinforcing member obstructs reading, the reinforcing member can be removed, so that high-quality image reading can be performed.

The reinforcing member may be provided so as to protrude from the surface of the transparent plate toward the original.

With this configuration, the reinforcing member can be provided without disturbing the arrangement or operation of the illumination system and the reading means provided on the side opposite to the original with respect to the transparent plate, that is, in the apparatus main body. Also, when the original is lifted from the transparent plate due to a step between the transparent plate and the reinforcing member when the original is placed, the user can remove the original and bring the original into close contact with the transparent plate. Reading becomes possible.

[0012] The reinforcing member may support the transparent plate from the apparatus main body side.

With this configuration, the reinforcing member is supported from the apparatus main body side where the transparent plate is subjected to the force by the pressed document, so that the deformation of the transparent plate can be more directly suppressed.

[0014] A placement reference portion may be provided as a contact reference when placing a document on the reinforcing member.

By providing the placement reference portion in this manner, the positioning of the original becomes easy, and accurate image reading becomes possible. In addition, if the abutment reference provided on the peripheral edge of the transparent plate is detachably provided integrally with the reinforcing member, if the document rises due to the step between the mounting reference portion and the transparent plate surface, remove it together with the reinforcing member. As a result, the original can be brought into close contact with the transparent plate, thereby enabling high-quality reading.

A document holding member for bringing a document into close contact with the transparent plate may be provided, and the document holding member may avoid the reinforcing member when used.

A concave portion or the like corresponding to the outer shape of the reinforcing member is formed in a portion corresponding to the reinforcing member of the original pressing member so that the original pressing member does not contact the reinforcing member even when the original pressing member is used. If the document pressing member is used to avoid the reinforcing member when the document pressing member is used, for example, by setting it at a position that does not interfere with the document pressing member, the reinforcing member does not hinder the pressing of the document against the transparent plate. Accordingly, it is possible to prevent deformation of the transparent plate and to read a high-quality image.

The document holding member may be detachable.

With this configuration, by removing the document pressing member, it is possible to read a document whose size interferes with the document pressing member.

The image reading apparatus may be provided in a reading section, and an image forming apparatus may form an image read by the reading section on a recording material.

In this way, the transparent plate can be prevented from being deformed when the original is pressed, and the original can be read in close contact with the transparent plate, so that a high-quality image can be formed. In particular, the image is read in a small width in the main scanning direction, and the read small width image is formed in the main scanning direction.
In the case of an image forming apparatus of a system in which a recording material is fed in the sub-scanning direction to connect images, the quality of a connected portion of the image due to the floating of the original from the transparent plate is not deteriorated, and the image is connected clearly, so that high quality is achieved. Can be formed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a perspective view of a reader R which is an image reading apparatus in which the present invention is effectively used, and FIG. 2 is a sectional view of a main part.

The glass supporting plate 10 as a supporting member has daruma holes 11 and 11, and after the step dowels 21 and 21 of the reinforcing plate 20 as the reinforcing member are aligned with the large diameter portion of the daruma hole, arrows are used. Slide in the direction to integrate. Usually, it is used with the reinforcing plate 20 attached. A back abutment plate 22 as a placement reference portion is integrated with the reinforcing plate 20 by bonding, laser welding, or the like. When the reinforcing plate is provided, the backing abutting plate 22 is located at a position indicated by a chain line in FIG. The position of the end face on the far side is clearly shown, and it is usually sufficient to place the document in abutment.
The right abutment plate 40 is fixed with a clip 41, and similarly, when placing a document, the right end surface is clearly shown.

When the original is larger than the original glass 30 as a transparent plate and is hard (for example, an original stuck on a styrene board) or when the original is to be protruded from the original glass and the original is to be placed facing the original glass 30, the reinforcing plate 20 is attached to the original. The original cannot be placed in close contact with the glass 30 because it protrudes above the glass 30. In such a case, the reinforcing plate 20 can be used by sliding it off.

Since the thickness of the abutment plate 40 is 1 mm or less, there is no great influence on reading of the original, but strictly, there is a possibility that the blur is slight or the light quantity is insufficient. In such a case, the clip 41 can be removed and the right abutment plate can be removed. Since this is done when the original cannot be placed against the edge,
It is easier to place such a document without the abutment plate.
Note that indicators 51, 52, 53, and 54 are provided as a guide for the end face. The indicator 53 is below the right abutment plate as shown by the dotted line.

The support plate 1 combined with the structural member of the leader R
If the original glass 30 is supported by 0, the size of the glass can be reduced and the span to be supported can be shortened.

The reinforcing plate 20 is for preventing the glass from deflecting against the pressing force in the case of a thick and heavy book or a book in which the center of the back binding does not easily adhere to the original glass. In this case, there is no need to press with a strong force, so that the strength of the glass support plate 10 is sufficient without the reinforcing plate 20.

Therefore, even when a large original is placed on the original glass 30, the original is prevented from floating from the glass 30 to enable high-quality reading, and the original is pressed against the original glass 30. The deformation at the time can be reduced.

(Second Embodiment) FIG. 3 shows a second embodiment.

Except for the structure of the support plate 15 and the reinforcing plate 25, the structure is the same as that of the first embodiment, and the description of the parts having the same structure will be omitted.

When a force is applied to the original glass, the glass and the support plate are bent in the middle because the glass and the support plate are in the middle, and the dowels 16 fixed to both ends of the glass support plate 15 and the holes 26 at the corresponding positions of the reinforcing plate 25 are positioned. The same usage is possible by integrating with a coin screw 27 which is rotated and tightened with a coin in the middle. If the reinforcing plate, which is the side to be mounted on, is formed as a hole as in the present embodiment, it is not necessary to take measures to drop dust from the hole.

(Third Embodiment) FIG. 4 shows a reader R according to a third embodiment.

In the present embodiment, the reader R according to the first embodiment is provided with a document press 50 as a document press member. Except for the document press 50, the reader R according to the first embodiment is the same as the reader R according to the first embodiment. Since it has a configuration, a description of a portion having the same configuration will be omitted.

At the time of normal use, as shown in FIG.
When the original is pressed against the glass according to 0, the original may be disturbed even when the original is opened and used for a large original. In such a case, the original holder 50 detachably attached to the receptacles 55, 55 (see FIG. 1) is removed by using a plug-in type hinge (not shown) and can be used in the state of FIG. By doing so, even a large document stuck on a hard plate can be brought into close contact with the document glass without floating at all, so that high-quality reading is possible.

(Fourth Embodiment) FIG. 5 shows a schematic configuration of a printer 80 as an image forming apparatus according to a fourth embodiment. The printer 80 includes a reader R as a reading unit.
And a printer unit P for forming an image.

In the present embodiment, a pressure plate 51 is provided on the lower surface of the document holder 50. The other configuration of the reader R has the same configuration as that of the first to third embodiments, and a description thereof will be omitted. In addition, since a known image forming method can be used for the printer unit P, a detailed description of the configuration is omitted.

In order to press a wavy document or the like against a document glass, the pressure plate may be pressed from above. At this time, if the reinforcing plate located above the original glass and the pressure plate are configured to contact each other, the original glass and the supporting plate that is supported are deformed when pressed, thereby affecting reading accuracy. In an extreme case, the glass may be broken or come into contact with a member to be read and scanned.

In the cross-sectional view shown in FIG. 5, a cushioning pressure plate 51 having a white plate on the surface in contact with the document 70 is attached to the document 70 attached to the styrene board.
The structure is such that the contact is made only in a certain region of 0 and does not contact the reinforcing plate 20, and the reinforcing plate 20 is not deformed.

When the document is thick, the rotation center 53 of the document pressure plate
The insertion portion 52 of the hinge, which is formed as described above, rises from the receiving port 55, so that the pressure plate 51 and the document 70 come into uniform contact and are pressed against the document glass 30. Therefore, high-quality reading and image formation are possible. In particular, an image is read in a fine width in the main scanning direction, and the read image is formed by scanning in a main scanning direction with a fine width on a recording material such as paper, and the recording material is moved in the sub-scanning direction by an amount corresponding to the image formed. Even when sending images to connect images, the quality of the image does not deteriorate due to the connection,
High quality image formation becomes possible.

(Fifth Embodiment) A fifth embodiment will be described with reference to FIGS. FIG. 6 shows only a schematic configuration around the reinforcing plate 61 of the leader. The leader body according to the present embodiment can have the same known configuration as the first to fourth embodiments, except for the configuration of the frame 60 and the reinforcing plate 61, and thus the description is omitted.

The original glass 30 is placed on the cut and bent portions 60a of the frame 60 as a support member.
A reinforcing plate 61 as a reinforcing member is one in which four parts including a butting plate 62 as a mounting reference portion are integrated by spot welding, and supports the original glass 30 in cooperation with the frame 60. The reinforcing plate 61 is fixed to the frame 60 with a coin screw 63.
The dowels 63 may be simply inserted into the frame 60 as shown in FIG.

As described above, the cut and bent portion 6 of the frame 60
Similar to the support of the original glass 30 by the reference numerals 0a and 60a, the original glass 30 is supported and reinforced from below, which is a side receiving a force when the original is pressed, so that the deformation of the original glass 30 is reduced more effectively. can do.

In the case of a hard and large original, if the reinforcing plate 61 is used in a state where the glass is supported only by the extraction frame, the original will not be lifted by the reinforcing plate 61 or the butting plate 62.

[0044]

As described above, according to the present invention,
If the reinforcing member is provided on the support member of the transparent plate, the deformation of the transparent plate is reduced even when the original is pressed against the transparent plate, so that the transparent plate and the support member are deformed and the reading provided in the image reading apparatus main body is performed. It is possible to prevent the transparent plate itself from being brought into contact with the means and the illumination system, and from being damaged. In addition, by providing such a reinforcing member in a detachable manner, when the reinforcing member obstructs reading, the reinforcing member can be removed, so that high-quality image reading can be performed.

If the reinforcing member is provided so as to protrude from the surface of the transparent plate toward the original, the arrangement or operation of the illumination system and reading means provided on the side opposite to the original relative to the transparent plate, that is, in the apparatus main body, is obstructed. The reinforcing member can be provided without the need. Also, when the original is lifted from the transparent plate due to a step between the transparent plate and the reinforcing member when the original is placed, the user can remove the original and bring the original into close contact with the transparent plate. Reading becomes possible.

If the reinforcing member supports the transparent plate from the apparatus main body side, the reinforcing member supports the transparent plate from the apparatus main body side where the transparent plate receives a force by the pressed document.
The deformation of the transparent plate can be suppressed more directly.

Further, by providing a placement reference portion serving as an abutment reference when placing a document on the reinforcing member, positioning of the document becomes easy, and accurate image reading becomes possible. In addition, if the abutment reference provided on the peripheral edge of the transparent plate is detachably provided integrally with the reinforcing member, if the document rises due to the step between the mounting reference portion and the transparent plate surface, remove it together with the reinforcing member. As a result, the original can be brought into close contact with the transparent plate, thereby enabling high-quality reading.

Further, a concave portion or the like corresponding to the outer shape of the reinforcing member is formed at a portion corresponding to the reinforcing member of the document pressing member so that the concave portion does not contact the reinforcing member even when the document pressing member is used. By setting the reinforcing member at a position where it does not interfere with the document pressing member and avoiding the reinforcing member when the document pressing member is used, the reinforcing member does not become an obstacle when pressing the document against the transparent plate. In addition, the deformation of the transparent plate can be prevented, and high-quality image reading can be performed.

If the original pressing member is detachable, it is possible to read an original having a size that interferes with the original pressing member by removing the original pressing member.

Further, if the image reading apparatus is provided in the reading section and the image forming apparatus forms the image read by the reading section on the recording material, the transparent plate can be prevented from being deformed when the original is pressed, and Since the original can be read in close contact with the transparent plate, a high-quality image can be formed. In particular, in the case of an image forming apparatus of a system in which an image is read with a minute width in the main scanning direction, the read minute image is formed in the main scanning direction, and a recording material is fed in the sub-scanning direction to connect the images. In the case of (1), the quality of the connecting portion of the image is not degraded due to the floating of the document from the transparent plate, and the image is connected clearly, so that a high-quality image can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reader according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a perspective view of a main part in a second embodiment.

FIG. 4 is a perspective view of a reader according to a third embodiment with a document holder closed.

FIG. 5 is a cross-sectional view of the reader and the printer, and shows that the document holder is not in contact with the reinforcing plate.

FIG. 6 is a sectional view of a main part in a fourth embodiment.

FIG. 7 is a perspective view of a main part of a frame according to a fourth embodiment.

FIG. 8 is a view showing another fixing method according to the fourth embodiment.

FIG. 9 is an explanatory diagram of a reading state of a reader.

FIG. 10 is an explanatory diagram of a writing state of the printer.

FIG. 11 is a diagram for explaining a problem when a document is lifted.

[Explanation of symbols]

 10, 15 glass support plate 11 dowel hole 16 dowel 20, 25, 61 reinforcing plate 21 step dowel 22, 62 abutment plate 30 document glass 50 document holder 51 crimp plate 52 hinge insertion part 55 receiving port 60 frame

Claims (7)

[Claims] An original is placed so as to face a transparent plate,
An image reading apparatus for reading an image of a document via the transparent plate, wherein a reinforcing member for reinforcing a supporting member supporting the transparent plate is detachably provided. 2. The image reading apparatus according to claim 1, wherein the reinforcing member is provided so as to protrude from the surface of the transparent plate toward a document. 3. The image reading apparatus according to claim 1, wherein the reinforcing member supports the transparent plate from the apparatus main body. 4. The image reading apparatus according to claim 1, further comprising: a placement reference portion serving as a contact reference when placing a document on the reinforcing member. 5. The image reading apparatus according to claim 1, further comprising a document pressing member for bringing a document into close contact with said transparent plate, wherein said document pressing member avoids said reinforcing member when used. 6. The image reading apparatus according to claim 5, wherein said document pressing member is detachable. 7. An image forming apparatus comprising the image reading device according to claim 1 in a reading unit, and forming an image read by the reading unit on a recording material.