JPH11202425A - Document reading device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a document reading apparatus that improves image quality of a read image by pressing the document onto a contact glass in a state where the document is appropriately brought into close contact with a pressure plate. A press platen of a document reading apparatus includes a press plate main body (1).
5. Sponge 16 and white sheet plate 17 are double-sided tape 1
The pressure plate body 15 and the sponge 16 are adhered to the mutual peripheral portions only with the double-sided tape 18, while the central portion is in a non-adhered state. Therefore, even if the press plate main body 15 is warped, the sponge 16 does not follow the warp of the press plate main body 15 and absorbs the warp of the press plate main body 15 at the non-adhered portion at the central portion. As a result, even when the pressing plate body 15 is warped, the original is set on the contact glass 12 and
When the original is pressed against the contact glass 12 by the pressure plate 14, the original can be brought into close contact with the surface of the contact glass 12 with no gap by the white sheet plate 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus, and more particularly, to a document reading apparatus which presses a document onto a contact glass in a state where the document is properly brought into close contact with a pressure plate to improve the image quality of a read image. .

[0002]

2. Description of the Related Art Conventionally, a document reading apparatus such as a copying apparatus or a facsimile apparatus having a reading section for reading a book-type document has a document set on a contact glass pressed against the surface of the contact glass by a pressure plate and read by reading means. ,
The image of the document is read by performing main scanning and sub-scanning on the surface of the document pressed against the contact glass.

That is, a reading device irradiates a document set on a contact glass and pressed against the contact glass by a pressure plate with light from a light source of a reading unit, and forms an image of reflected light from the document on a photoelectric conversion element. Read the image of the original.

In such a document reading apparatus, when the document is floated from the surface of the contact glass, the quality of the read image is deteriorated due to external light entering between the surface of the contact glass and the document. In addition, it is necessary to bring the original into close contact with the contact glass with a pressure plate.

Therefore, in a conventional document reading apparatus, as shown in FIG. 8, a pressing plate 1 for pressing a document onto a contact glass is entirely adhered to a pressing plate main body 2 with a sponge 3 with an adhesive or the like. The white sheet plate 4 has a three-layer structure in which the white sheet plate 4 is entirely adhered to the surface with an adhesive or the like.
The original is pressed against the contact glass by the, and the original is brought into close contact with the contact glass by the elasticity of the sponge 3.

[0006]

However, in such a conventional document reading apparatus, the pressing plate 1 is bonded to the pressing plate body 2 with the sponge 3 entirely, and the white sheet plate 4 is bonded to the sponge 3 with the entire surface. As shown in FIG. 8, when the press plate body 2 is warped as shown in FIG. 8, the warp of the press plate body 2 extends to the sponge 3 and the white sheet 4, and as shown in FIG. There is a gap 6 between the glass and the glass 5, and the document cannot be brought into close contact with the contact glass 5, resulting in a problem that the image quality of the image read by the document reading device is deteriorated.

Therefore, according to the first aspect of the present invention, a pressure plate for pressing an original set on the contact glass against the contact glass is formed by a pressure plate main body having a size at least covering the contact glass, and a predetermined adhesive member attached to the pressure plate main body. It is provided with a predetermined elastic member adhered, and a white sheet plate adhered to the elastic member by a predetermined adhesive member and given a white color, and the pressure plate main body and the elastic member are at least centered between the pressure plate main body and the elastic member. Even if warpage occurs in the pressure plate main body by bonding with an adhesive member in a state where the portion is non-adhered over a predetermined size, the warp of the pressure plate main body is absorbed by the non-adhered portion of the pressure plate main body and the elastic member. The original on the contact glass is pressed in a state in which the original is securely brought into contact with the contact glass, and an inexpensive original that can improve the image quality of the read image And its object is to provide a winder.

According to the second aspect of the present invention, the pressure plate main body and the elastic member are appropriately and securely bonded to each other by making the entire peripheral portion other than the central portion adhered by the adhesive member. At the same time, even when the pressure plate main body is warped, the non-adhesive portion between the pressure plate main body and the elastic member absorbs the warp of the pressure plate main body, and the original on the contact glass is pressed in a state in which the original is securely adhered to the contact glass. It is another object of the present invention to provide an inexpensive document reading device capable of improving the image quality of a read image.

According to a third aspect of the present invention, the pressing plate body and the elastic member which are formed in a predetermined square shape are combined with each other only in two sides of the opposing four sides of the rectangular pressing plate body and the elastic member. The pressure plate main body and the elastic member are appropriately bonded to each other by warping the pressure plate main body by forming the non-adhesive portion in a band shape at the central portion of the pressure plate main body and the elastic member by being bonded by the adhesive member over a predetermined width. Even when the pressure plate occurs, the warp of the pressure plate main body is more appropriately absorbed by the non-adhesive portion between the pressure plate main body and the elastic member, and the original on the contact glass is more securely pressed against the contact glass. It is another object of the present invention to provide an inexpensive document reading apparatus capable of further improving the image quality of a read image.

[0010] According to a fourth aspect of the present invention, as the adhesive member,
By using the double-sided tape, the pressure plate body and the elastic member and / or the elastic member and the white sheet plate are bonded inexpensively and with good workability, and the original on the contact glass is securely adhered to the contact glass. It is an object of the present invention to provide an even more inexpensive document reading device that can press and improve the image quality of a read image.

According to a fifth aspect of the present invention, as the adhesive member,
By using the adhesive, the pressure plate body and the elastic member and / or the elastic member and / or the white sheet plate are bonded inexpensively and with good workability, and the original on the contact glass is securely adhered to the contact glass. It is an object of the present invention to provide an even more inexpensive document reading device that can press and improve the image quality of a read image.

[0012]

According to a first aspect of the present invention, there is provided a document reading apparatus in which a document set on a contact glass is pressed against the contact glass by a pressure plate, and is pressed against the contact glass by the pressure plate. In the document reading apparatus that irradiates the document with light by a reading unit and reads an image of the document by reflected light thereof, the pressure plate has a pressure plate main body having a size at least covering the contact glass, and a predetermined size provided on the pressure plate main body. A predetermined elastic member adhered by an adhesive member, and a white sheet plate adhered to the elastic member by a predetermined adhesive member and applied in white,
The pressure plate body and the elastic member achieve the above object by being adhered by the adhesive member in a state where at least a central portion of the pressure plate body and the elastic member are non-adhered over a predetermined size. .

According to the above construction, the pressing plate for pressing the original set on the contact glass against the contact glass is composed of a pressing plate body large enough to cover at least the contact glass, and a predetermined pressing member adhered to the pressing plate body by a predetermined adhesive member. Elastic member, and a white sheet plate which is adhered to the elastic member with a predetermined adhesive member and is given a white color, and the pressure plate body and the elastic member are provided at least in a central portion of the pressure plate body and the elastic member. Since the pressure plate body is bonded by the bonding member in a non-bonded state over the size, even when the pressure plate main body is warped, the non-bonded portion between the pressure plate main body and the elastic member absorbs the warp of the pressure plate main body, and the contact is formed. The original on the glass can be pressed in a state of being in close contact with the contact glass, and the image quality of the read image can be improved at low cost.

In this case, for example, as described in claim 2, the pressure plate main body and the elastic member may be all adhered by the adhesive member at peripheral portions other than the central portion.

According to the above construction, since the pressure plate main body and the elastic member are formed so that all peripheral portions other than the central portion are bonded by the adhesive member, the pressure plate main body and the elastic member can be appropriately and reliably bonded. When the warp occurs in the press plate body, the warp of the press plate body is absorbed by the non-adhered portion of the press plate body and the elastic member, and the original on the contact glass is securely adhered to the contact glass. The image can be pressed, and the image quality of the read image can be improved at low cost.

Further, for example, the pressure plate main body and the elastic member are formed in a predetermined quadrangular shape, and four opposing sides of the rectangular press plate main body and the elastic member are formed. Of these, only two sides may be adhered by the adhesive member over a predetermined width, and the non-adhesive portion may be formed in a band shape at the central portion of the pressure plate body and the elastic member.

According to the above configuration, the pressing plate body and the elastic member formed in a predetermined square shape are connected to each other by setting only two sides of the opposing four sides of the rectangular pressing plate body and the elastic member to the predetermined width. And the non-adhered portion is formed in a band shape at the central portion of the pressure plate main body and the elastic member, so that the pressure plate main body and the elastic member can be appropriately bonded, and the warp of the pressure plate main body can be achieved. Even when the pressure plate occurs, the warp of the pressure plate main body is more appropriately absorbed by the non-adhesive portion between the pressure plate main body and the elastic member, and the original on the contact glass is more securely pressed against the contact glass. And the image quality of the read image can be further improved at low cost.

Further, for example, the adhesive member may be a double-sided tape.

According to the above construction, since the double-sided tape is used as the adhesive member, the pressure glass body and the elastic member and / or the elastic member and the white sheet plate are bonded at low cost and with good workability to form the contact glass. The upper document can be pressed in a state of being in close contact with the contact glass, and the image quality of the read image can be improved at a lower cost.

Further, for example, as described in claim 5, the adhesive member may be an adhesive.

According to the above construction, since the adhesive is used as the adhesive member, the pressure glass body and the elastic member and / or the elastic member and the white sheet plate are adhered inexpensively and with good workability to form the contact glass. The upper document can be pressed in a state of being in close contact with the contact glass, and the image quality of the read image can be improved at a lower cost.

[0022]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 to 6 show an embodiment of an original reading apparatus according to the present invention. FIG. 1 shows an original reading apparatus 10 to which an embodiment of the original reading apparatus according to the present invention is applied. It is a principal part perspective view.

In FIG. 1, a document reading apparatus 10 has a contact glass 12 disposed on an upper part of a main body case 11, and a hinge part 1 on the upper part of the main body case 11.
A pressure plate 14 is attached to the upper surface of the contact glass 12 so as to be openable and closable via 3. Although not shown, a light source, a mirror, a lens, and a CCD (Charge C) as a photoelectric conversion element are provided below the contact glass 12 in the main body case 11.
An image reading mechanism including an Oupled Device) and a traveling body mounted thereon and moving in the sub-scanning direction is provided. An original is set on the contact glass 12.

As shown in FIG. 2, the pressure plate 14 is composed of a pressure plate main body 15, a sponge (elastic member) 16, and a white sheet plate 17.
It is formed in a three-layer structure bonded with the sponge 16 sandwiched therebetween. As shown in FIG. 3, the pressure plate body 15, the sponge 16 and the white sheet plate 17 are adhered by double-sided tapes 18 and 19, respectively.
As shown in FIG. 4, the sponge 16 and the sponge 16 have a state in which the double-sided tape 18 is bonded to the sponge 16, and only a peripheral portion thereof is bonded by the double-sided tape 18, and a central portion is in a non-bonded state.

The sponge 16 and the white sheet plate 17 are adhered to each other with a double-sided tape 19.

Next, the operation of the present embodiment will be described. When reading a document, the document reading apparatus 10 opens the pressure plate 14, sets the document on the contact glass 12, closes the pressure plate 14, and contacts the document via the white sheet plate 17 by the elasticity of the sponge 16 of the pressure plate 14. Adhere to glass 12.

In this state, the original on the contact glass 12 is scanned in the main and sub-scan directions by the image reading mechanism to read the image of the original.

As shown in FIG. 5, the pressure plate 14 may be warped due to a change in time, a change in temperature, or the like, in the pressure plate body 15 constituting the pressure plate 14, as shown in FIG. However, the platen 14
As shown in FIGS. 2 and 3, the press plate body 15, the sponge 16 and the white sheet plate 17 are formed in a three-layer structure bonded with double-sided tapes 18 and 19, and the press plate body 15 and the sponge 16 However, as shown in FIG. 4, only the peripheral portions are adhered to each other with the double-sided tape 18, and the central portion is in a non-adhered state.

Therefore, the pressure plate body 15 and the sponge 16
Can be securely bonded, and the pressure plate body 15
Even if warpage occurs, as shown in FIG.
Does not follow the warp of the pressure plate main body 15 and can absorb the warp of the pressure plate main body 15 at the non-adhered portion at the center.

As a result, when the original is set on the contact glass 12 and the original is pressed against the contact glass 12 by the pressure plate 14 even when the pressing plate body 15 is warped, as shown in FIG. Sponge 16 having elasticity to warp of pressure plate main body 15, pressure plate main body 15, and sponge 1.
6 is absorbed by the non-adhesive portion at the center of the white sheet plate 17.
Thus, the original can be securely brought into close contact with the surface of the contact glass 12 without any gap. Therefore, the image quality of the read image can be improved.

As an adhesive member, a double-sided tape 18,
Since the pressure plate main body 15 and the sponge 16 and the sponge 16 and the white sheet plate 17 are bonded together using the pressure-sensitive member 19, the original plate reading device 10 can be bonded at low cost and with good workability. It can be manufactured efficiently.

In the above embodiment, the pressure plate main body 15 and the sponge 16 are adhered only to the peripheral portion of each other, and the central portion is made to be a non-adhesive portion, but the central portion is made to be non-adhesive. The method is not limited to this. For example, as shown in FIG. 7, as shown in a state in which the double-sided tape 18 is attached to the sponge 16, each of the square-shaped pressure plate main body 15 and the sponge 16 faces each other. A double-sided tape 1 is formed in a band shape on two opposing sides of the four sides.
8 may be stuck and the central portion may be a band-shaped non-adhesive portion. By doing so, the pressure plate body 15 and the sponge 16
Can be properly bonded, and the pressure plate body 15
The press plate body 15 and the sponge 1
The non-adhesive portion 6 more appropriately absorbs the warpage of the pressure plate main body 15, so that the original on the contact glass 12 can be more securely pressed in contact with the contact glass 12 and can be read at low cost. The image quality of the image can be further improved.

In the above-described embodiment, the double-sided tapes 18 and 19 are used as an adhesive member for adhering the pressure plate main body 15, the sponge 16 and the white sheet plate 17.
The adhesive member is not limited to the double-sided tapes 18 and 19, and may be, for example, a predetermined adhesive. Also in this case, the pressure plate 14 can be manufactured at low cost and with good workability.

Further, in the above embodiment, the sponge 16 is used as the elastic member. However, the elastic member is not limited to the sponge 16 and is suitable for pressing the original against the contact glass 12 without any gap. Any member may be used as long as the member has elasticity. However, when the press plate body 15 is warped, it is necessary that the press plate body 15 has a flexibility capable of appropriately absorbing the warp of the press plate body 15 at a non-adhesive portion with the press plate body 15.

As described above, the invention made by the inventor has been specifically described based on the preferred embodiments. However, the present invention is not limited to the above, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

[0037]

According to the document reading apparatus of the first aspect of the present invention, the pressure plate for pressing the document set on the contact glass against the contact glass is composed of a pressure plate body large enough to cover at least the contact glass, and a pressure plate body. A predetermined elastic member adhered to the elastic member, and a white sheet plate adhered to the elastic member by the predetermined adhesive member and provided with a white color. Since the main body and the central portion of the elastic member are adhered by the adhesive member in a state of being non-adhered over a predetermined size, even when the press plate main body is warped, the non-adhesive portion between the press plate main body and the elastic member is used. The original on the contact glass can be securely pressed against the contact glass by absorbing the warpage of the pressure plate body, and the image quality of the scanned image can be improved at low cost. It can be.

According to the document reading apparatus of the second aspect of the present invention, since the pressure plate main body and the elastic member are formed such that all peripheral portions other than the central portion are adhered by the adhesive member, the pressure plate main body and the elastic member can be appropriately connected. In addition to being able to adhere securely, even if the pressure plate body is warped,
The non-adhesion part of the pressure plate body and the elastic member absorbs the warpage of the pressure plate body, and the original on the contact glass can be pressed in a state of being in close contact with the contact glass. Can be improved.

According to the document reading apparatus of the third aspect of the present invention, the pressure plate main body and the elastic member formed in a predetermined rectangular shape are separated from the four sides of the square pressure plate main body and the elastic member. Since only the two sides are adhered by an adhesive member over a predetermined width and the non-adhesive portion is formed in a band shape at the central portion of the pressure plate main body and the elastic member, the pressure plate main body and the elastic member are appropriately bonded. In addition, even when warpage occurs in the pressure plate body, the warp of the pressure plate body is more appropriately absorbed by the non-adhered portion between the pressure plate body and the elastic member, so that the original on the contact glass can be more reliably contacted. The image can be pressed in a state of being in close contact with the glass, and the image quality of the read image can be further improved at low cost.

According to the fourth aspect of the present invention, since the double-sided tape is used as the adhesive member, the pressure plate body and the elastic member and / or the elastic member and the white sheet are inexpensively and easily operable. The plate can be adhered so that the original on the contact glass can be pressed in a state in which the original is in close contact with the contact glass, and the image quality of the read image can be improved more inexpensively.

According to the document reading apparatus of the present invention, since the adhesive is used as the adhesive member, the pressure plate body and the elastic member and / or the elastic member and the white sheet are inexpensively and efficiently operable. The plate can be adhered so that the original on the contact glass can be pressed in a state in which the original is in close contact with the contact glass, and the image quality of the read image can be improved more inexpensively.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a document reading apparatus to which an embodiment of a document reading apparatus according to the present invention is applied.

FIG. 2 is an exploded perspective view of the pressure plate of FIG.

FIG. 3 is a front sectional view of the pressure plate of FIG. 2;

FIG. 4 is a perspective view of a state in which a double-sided tape is attached to a surface of a sponge of the pressure plate of FIG. 2;

FIG. 5 is a front sectional view of the press plate of FIG. 1 in a state where a press plate main body is warped;

FIG. 6 is a front sectional view of a state in which a pressure plate in which warpage has occurred in the pressure plate body of FIG. 5 is pressed against the surface of a contact glass;

FIG. 7 is a perspective view showing another example of a form of attaching a double-sided tape attached to the surface of a sponge of a pressure plate.

FIG. 8 is a front sectional view showing a state in which warpage of a conventional pressure plate occurs.

9 is a front sectional view of a state in which the warped pressure plate of FIG. 8 is pressed against the surface of the contact glass.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Document reading apparatus 11 Main body case 12 Contact glass 13 Hinge part 14 Pressure plate 15 Pressure plate main body 16 Sponge 17 White sheet plate 18, 19 Double-sided tape

Claims (5)

[Claims] 1. A document set on a contact glass is pressed against the contact glass by a pressure plate, and the document pressed by the pressure plate against the contact glass is irradiated with light by reading means and reflected by the reflected light. In the document reading apparatus that reads an image of the document, the pressure plate includes a pressure plate main body having a size covering at least the contact glass, a predetermined elastic member adhered to the pressure plate main body with a predetermined adhesive member, and the elastic member. A white sheet plate adhered by a predetermined adhesive member and given a white color,
The document reading apparatus according to claim 1, wherein the pressure plate main body and the elastic member are bonded by the bonding member in a state where at least a central portion of the pressure plate main body and the elastic member are not bonded over a predetermined size. 2. The document reading apparatus according to claim 1, wherein the pressure plate main body and the elastic member are all adhered by the adhesive member at peripheral portions other than the central portion. 3. The pressure plate main body and the elastic member are formed in a predetermined square shape, and only two sides of the opposing four sides of the square pressure plate main body and the elastic member have a predetermined width. 2. The document reading apparatus according to claim 1, wherein the non-adhesive portion is formed in a band shape at a central portion between the pressure plate main body and the elastic member by being adhered by the adhesive member. 4. The document reading apparatus according to claim 1, wherein said adhesive member is a double-sided tape. 5. The document reading apparatus according to claim 1, wherein said adhesive member is an adhesive.