JPS62235863A - Imagh reader - Google Patents

Abstract

PURPOSE:To form a compact, cost-saving image reader that enhances the freedom degree of designing by providing an air blower in an automatic original feeder, blowing wind to the image reader and cooling the reader. CONSTITUTION:The air blower 109, an axial fan, for instance, is fitted in the automatic oridinal feeder D, and its blow port corresponds to an air intake hole 4a drilled on the upper cover part 4 of the image reader A. Air guides 13 and 14 to guide the air coming in from the air intake hole 4a are provided in the image reader A, and can blow wind to the 1st mirror unit B with a lighting lamp 6.

Description

[Detailed Description of the Invention] [Purpose of the Invention] "Industrial Application Field" The present invention is an image reading device to which an automatic document feeder can be attached, and prevents temperature rise due to the illumination system in the image reading device. The present invention relates to an image reading device in which an air blower is housed in an automatic document feeder and cools the document according to the document reading mode.

``Prior Art'' Conventionally, image reading devices place a document on a document glass plate, and below the document glass plate, an illumination system for illuminating the document, an optical system such as a mirror lens, and a solid-state image sensor for image reading are arranged. However, it has a fixed document scanning mode in which the document image is scanned and read by moving an optical system such as an illumination system and a mirror. Further, automatic document feeders that transport the document onto a document table glass, read the image, and then eject the document are also widely used. This automatic document feeder transports the document onto the document table glass, stops it 7 times, and stops the optical and illumination system except when reading an image in the same manner as in the document fixed scanning mode. There is a moving scan mode in which the document is transported to the image reading unit that is currently running and scanned. The automatic document feeder using the latter document moving and scanning mode requires a short portion for conveying the document to the image reading device, so it can be configured more compactly and is effective in downsizing. However, since light is emitted while the illumination system is stopped at a fixed location, there is a large local increase in temperature, and cooling inside the image reading device is essential. Therefore, a cooling fan for blowing air is required in the image reading device to cool the stop position of the illumination system. However, in the normal document fixed scanning mode, the movement of the illumination system and optical system creates a flow of air inside the apparatus, and since only a portion of the apparatus is illuminated, the temperature rise is dispersed, and cooling by a cooling blower is not required. Therefore, it is wasteful to dispose a cooling blower inside the image reading device, and the degree of freedom in terms of space is lost in the design, which hinders miniaturization. Furthermore, the automatic document feeder is not always installed in the image reading device, and the user can choose whether or not to install it. In order to make this possible, the cooling fan, its control circuit, power supply, etc. must be installed in the image reading device in advance, regardless of the presence or absence of an automatic document feeder. This has the disadvantage of hindering miniaturization and increasing costs.

The present invention eliminates the drawbacks of the conventional example described above, provides a more compact and low-cost image reading device, and also reconfigures the automatic document feeder to provide sufficient performance for users who require document movement scanning mode. It is an object of the present invention to provide an image reading device that can achieve the desired performance, and can realize a price and a compact size that meet the individual needs of users.

[Structure of the invention]

"Means for Solving the Problems" The present invention provides a fixed document scanning mode in which an automatic document feeder can be attached and the document is scanned by moving the optical illumination system, and a fixed document scanning mode in which the document is scanned by moving the optical illumination system. In an image reading device having a document moving scanning mode in which a document is scanned by an automatic document feeder, the automatic document feeder has an air blower, and the image reading device has an air intake from the blower, This image reading device is capable of being attached to an automatic document feeder and is characterized by blowing air into the image reading device for cooling.

``Function'' If the automatic document feeder is not installed, or if the automatic document feeder is installed but is used in fixed document scanning mode, the image reading device does not have a blower, so images that do not originally require a blower are The reading device scans the document by moving an optical illumination system. In a document reading device that is equipped with an automatic document feeder and operates in document movement scanning mode, air is sent from the blower in the automatic document feeder into the image reading device α through the air intake port of the image reading device to cool the inside. It will be done.

"Example" Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1(a) to 1(1) show an embodiment of the present invention, which is an example of a normal image reading apparatus in a fixed document scanning mode with a document pressure plate.

The original is placed with the image side facing down on the top surface of the original platen glass 1, and is covered from the back side with the original pressure plate 2. A sponge-like white sheet 2a is placed on the surface of the original pressure plate 2 that contacts the original. Prevents displacement and lifting due to pressure. Original pressure plate 2
There are two constrictions 21) and 20, and by bending at these constrictions, the document pressure plate 2 can be held upright in a state away from the document table glass 1 for purposes such as exchanging documents.

In addition, as shown in FIG. 1 ((1)), the document pressure plate 2 has two convex portions 2d and 2θ that fit into two holes 3° and 3° on the top surface of the image reading device main body A. It is configured so that it can only be removed from the image reading apparatus main body A, and the document pressure plate 2 can be removed when a large document is to be processed.

A large number of air intake holes 4a are provided in the exterior part of the image reading device eA, which is a part 4 of the upper cover in this embodiment. This hole may be one large hole, but in order to prevent dirt and foreign matter from entering, it is preferable to use a long hole or a collection of small holes. This air intake hole 4a may be provided not only on the top surface but also on the side surface, etc., and there is no limitation to the shape of the hole as long as it is an air intake hole that can guide wind. Original pressure plate 2 is attached to image reading device A.
If the air intake hole 4a is configured to be covered by the document pressure plate 2 when the
When the K draft pressure plate 2 is used, the appearance is not unsightly, and dust, clumps, etc. can be prevented from entering.

Also, if you attach the filter 5 to the hole 41, it will remove dirt.
This can further prevent the invasion of lumps.

The image reading device A includes a first mirror that moves below the original platen glass 1 by integrating an illumination lamp 6, a reflective shade 7, and a first reflective mirror 8.
The light from mirror unit B and the first mirror 8 is rotated by 180°.
A second mirror unit C that moves and includes two second mirrors 9 and 9I that change direction and are tilted at 90 degrees to each other, a lens 10, and a solid-state image sensor 11 such as a COD forms an optical path. The original image on the original table glass 1 is captured by the solid-state image sensor 1.
1 and can be taken out as an image signal.

A fixed original scanning mode can be realized by scanning the original on the original platen glass 1 by moving the second mirror unit (O) relative to the first mirror unit B at a speed of -.

Next, to explain the state in which the automatic document feeder is attached to the image reading device A in FIG.
An automatic document feeder is disposed on the document table glass 1, which is attached so that the document pressure plate 2 can be removed and opened and closed by another hinge means 12. The automatic document feeder feeds the documents P on the document tray 101 one by one using a paper feed roller 102, is conveyed by conveyance rollers 103 and 104, and is guided to the document table glass 1 part, and is placed between the document table glass 1 and the white back plate. 105, and the original image is read when passing through the gap. After reading the original image, the original is ejected onto a paper ejection tray 107 by an ejection roller 106.

The originals on the original tray 101 are stacked with the image side facing upward, and the originals are separated and fed one by one from the top to the output tray 1.
Documents are stacked on page 07 in page order. In addition, the part I of the automatic document feeder fD that comes into contact with the document platen glass 1 other than the document transport section is made of a sponge similar to that used for the document pressure plate 2 in order to manually place the document on the document platen glass 1. white sheet 10
8 is Ha.

Further, a blower 1a9, for example, an axial fan (for example, a cross-flow fan) is installed in the automatic document feeder, and the outlet of the blower fa109 is connected to the image reading m
Part 4 of the top cover of RA.

This corresponds to the air intake hole 4a that is installed. In addition, there is an air intake hole 4a inside the image reading device fiA.
There is a wind guide 15.14 that guides the air coming in from
Air can be blown into the first mirror unit B where the illumination lamp 6 is located.

In this embodiment, the wind guides 13 and 14 guide the wind to the first mirror unit (B) section, but without being particular about this, it is optimal to guide the wind in the most effective direction and position.

The image reading device A uses the first mirror unit B1 and the second mirror unit C#Iζ when reading a document using an automatic document feeder, that is, in the document movement scanning mode.
In order to scan the document by transporting it while stopping at a predetermined position, it is provided with an illumination lamp 6. 1st mirror unit)
Since the temperature of the image reading section of the document platen glass 1, which is always illuminated in the same area as B, increases rapidly, effective cooling can be achieved by creating a flow of air to this area. . □ ′・Blower 109
should at least operate in the document moving scan mode using the automatic document feeder. Place the document on the glass 1 and move it to the automatic document feeder I)
The blower 109 may be stopped when reading the document in the document fixed scanning mode by covering it with This is an example in which cooling and blowing air inside the automatic document feeder ID are performed at the same time, and the blower 109 can be used effectively.

FIGS. 4(a) and 4(b) show a shutter 201 attached to the main body under the air intake hole 4a of the exterior part 4 of the image reading device A.
In this example, the shutter 201 is attached by a pivot 204, and the spring 202 is constantly receiving a force in the direction of closing the hole 4a. In FIG. 4(a), when the automatic document feeder is opened (FIG. 4(b)), there is a lever part 203 that operates to open the shutter 201. By removing the feeding device and closing the air intake hole 4a using the original pressure plate 2, it is possible to prevent dust, debris, etc. from entering.

The shutter 201 may also be configured to function as a wind guide when opened.

Furthermore, when the automatic document feeder is attached to the image reading device A using the hinge 12 as shown in Fig. 2, the hinge portion may use the holes 3 and 3' that are common to the document pressure plate 2, making it easier for the user. It may be configured such that it can be loaded onto the image reading device A later.

Although this embodiment has been described with respect to an image reading device, it goes without saying that the same applies not only to digital image reading devices using solid-state image pickup devices but also to copying machines and the like.

〔Effect of the invention〕

The present invention has a fixed original scanning mode in which an automatic document feeder can be attached and the document is scanned by moving the optical illumination system, and a scanning mode in which the automatic document feeder scans the original while the optical illumination system is stopped at a predetermined position. In an image reading device having a document movement scanning mode, the automatic document feeder has a blower, and the image reading device has an air intake from the blower to blow air into the image reading device for cooling. Since the image reading device can be attached to an automatic document feeder, which is characterized by It has become possible to provide an image reading device with an increased degree of freedom. Also, when retrofitting an automatic document feeder as an application to an image reading device, it eliminates the need for the operator to perform complicated tasks such as installing a blower inside the image reading device, making system upgrades easier. It is now possible to provide an image reading device.

[Brief explanation of drawings]

FIG. 1(a) is a longitudinal sectional view of an image reading device according to an embodiment of the present invention, FIG. 1(1)) is a plan view of FIG. 1(11), and FIG.
Figure (C) is a perspective view of the original pressure plate attachment part, Figure 1 (d)
2 is a vertical sectional view of an image reading device and an automatic document feeder according to an embodiment of the present invention, and FIG. 3 is a perspective view of an automatic document feeder according to another embodiment of the present invention. Longitudinal cross-sectional view, FIG. 4(a). (b) is a longitudinal cross-sectional view of an air intake section of an image reading device according to still another embodiment of the present invention. 4a...Air intake hole 109...Blower.

Claims (1)

[Claims] 1. An automatic document feeder can be installed and the document can be scanned in a fixed document scanning mode by moving the optical illumination system, and the automatic document feeder can scan the document with the optical illumination system stopped at a predetermined position. In an image reading device having a document movement scanning mode, an automatic document feeder includes a blower, and the image reading device has an air intake from the blower to blow air into the image reading device for cooling. An image reading device to which an automatic document feeder can be attached.