JPH0636541B2 - Image reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention, in an image reading apparatus to which an automatic document feeder can be attached, prevents a temperature rise due to an illumination system or the like in the image reading apparatus. The present invention relates to an image reading apparatus in which an air blower is housed in an automatic document feeder and cooling is performed according to a reading mode of the original.

"Prior Art" Conventionally, an image reading apparatus places a document on a platen glass, and below the platen glass, an illumination system for document illumination, an optical system such as a mirror lens, and a solid-state image sensor for image reading are arranged. However, it has an original fixed scanning mode for scanning and reading an original image by moving an illumination system and an optical system such as a mirror. Further, an automatic document feeder which conveys a document onto a platen glass and discharges it after reading an image is also widely used. In this automatic document feeder, the original is conveyed on the platen glass, stopped once, and the optical and illumination systems are stopped except when the image is read in the same manner as the fixed document scanning mode, and the original is stopped. There is a document movement scanning mode in which the document is conveyed to the image reading unit and is read in a flow mode. The latter automatic document feeder in the original document moving / scanning mode can be configured more compactly and is effective for downsizing, because the conveying portion of the document to the image reading device is short. However, since light is emitted while the illumination system is stopped at a certain place, the partial temperature rise is large and cooling inside the image reading apparatus is essential. Therefore, in order to cool the stop position of the illumination system in the image reading device, a cooling blower for blowing air is required. However, in the normal fixed document scanning mode, the illumination system and the optical system move to allow airflow in the apparatus, and since only a part of the illumination is generated, the temperature rise is dispersed and cooling by a cooling blower is not particularly required. Therefore, disposing the cooling blower in the image reading device is wasteful, and the degree of freedom in space is impaired in terms of design, which prevents compactness. Further, the automatic document feeder is not always installed in the image reading device, and it is possible for the user to select whether or not to mount it. Furthermore, the automatic document feeder can be mounted later to the image reading device of the user or the like. In order to do so, the cooling blower and its control circuit, power supply, etc. must be installed in advance in the image reading device regardless of the presence or absence of the automatic document feeder, and the image reading device alone can be made compact. It has the drawback of being bothersome and costly.

The present invention eliminates the above-mentioned drawbacks of the prior art, can provide a more compact and low-priced image reading apparatus, and is also equipped with an automatic document feeder, and its performance is sufficient for a user who needs a moving document scanning mode. It is an object of the present invention to provide an image reading device that can be exhibited, and to provide an image reading device that can realize a price and a compact size that meet individual needs of users.

[Structure of Invention]

"Means for Solving Problems" The present invention is capable of mounting an automatic document feeder, and in a fixed document scanning mode in which a document is scanned by moving the optical illumination system, and in a state where the optical illumination system is stopped at a predetermined position. An image reading apparatus having an original moving scanning mode in which a document is automatically read by an automatic document feeder, has a blower in the automatic document feeder, and the image reader has an air intake port from the blower. An image reading apparatus attachable to an automatic document feeder, characterized in that air is blown into the image reading apparatus for cooling.

"Operation" When the automatic document feeder is not installed, or when the automatic document feeder is used but it is used in the fixed document scanning mode, there is no blower in the image reading device. The device scans the document by moving an optical illumination system. In the case of a document reading device that operates in the document moving / scanning mode when equipped with an automatic document feeder, air is blown from the blower in the automatic document feeder into the image reading device through the air intake port of the image reading device to cool the inside. Be seen.

[Examples] Examples of the present invention will be described below with reference to the drawings. Fig. 1 (a)
(D) is an embodiment of the present invention, which is an example of a normal image reading apparatus in the original fixed scanning mode with an original pressure plate.

The original is placed on the upper surface of the original platen glass 1 with the image surface facing downward, and is covered with the original pressure plate 2 from the rear side thereof. The surface of the original pressure plate 2 that contacts the original is covered with a sponge-like white sheet 2a. Prevents misalignment and floating. Document pressure plate 2
There are two constricted portions 2b, 2c in the area, and by bending at this portion, the original platen 2 can be stood and held in a state that it is far from the surface of the original glass 1 when exchanging an original. Further, as shown in FIG. 1 (d), the original pressure plate 2 has two convex portions 2 which engage with two holes 3 and 3'on the upper surface of the image reading apparatus main body A.
There are d and 2e, which can be detached from the image reading apparatus main body A, and the original pressure plate 2 can be removed when a large original is used.

A large number of air intake holes 4a are formed in the exterior portion of the image reading apparatus A, that is, the upper surface cover portion 4 in this embodiment. This hole may be one large hole, but a long hole or a group of small holes is more preferable in order to prevent dust and foreign matter from entering. The air intake hole 4a is not limited to the upper surface and may be on the side surface or the like, and the shape of the hole is not limited as long as it is an air intake port capable of guiding the wind. With the document pressure plate 2 attached to the image reading device A, the air intake hole 4a
If the document pressure plate 2 is configured to cover,
When the document pressure plate 2 is used, the appearance is not unsightly and dust and dirt can be prevented from entering.

If you put a filter 5 on the hole 4a,
It can further prevent dust from entering.

The image reading apparatus A includes a first lamp 6 for lighting, a reflecting shade 7 and a first reflecting mirror 8 which are integrally moved below the platen glass 1.
The mirror unit B and the two second mirrors 9, which have a 90-degree inclination with respect to each other, convert the light from the first mirror 8 by 180 °.
An optical path is formed by the second mirror unit C having 9'and moving, the lens 10, and the solid-state image pickup device 11 such as CCD, and the image of the original document on the platen glass 1 is formed on the solid-state image pickup device 11 to form an image. It can be taken out as a signal.

The original document on the original platen glass 1 can be moved to the first mirror unit B by moving the second mirror unit C at a half speed to scan the original document, thereby realizing the original document fixed scanning mode.

Next, the state in which the automatic document feeder D is attached to the image reading device A in FIG. 2 will be described.
An automatic document feeder D, which is detachably attached to the original platen glass 1 and is openably and closably attached by another hinge means 12, is disposed on the original glass plate 1. The automatic document feeder D feeds out the originals P on the original tray 101 one by one by the paper feed rollers 102, and they are transported by the transport rollers 103 and 104 and guided to a portion of the original platen glass 1, and the original platen glass 1 and the white back plate 105. The original image is read when passing through the gap. After reading the original image, the original is ejected onto the paper ejection tray 107 by the ejection roller 106.

The originals on the original tray 101 are stacked with the read image surface facing upward, and are separated and fed one by one from the top so that the discharge tray 1
Documents are stacked on the page 07 in page order. In addition, in the portion other than the document feeding portion of the automatic document feeder D that comes into contact with the platen glass 1, a sponge-like white color similar to that of the original platen 2 is used for manually placing the document on the platen glass 1. Sheet 108
There is.

Further, a blower 109, for example, an axial flow fan (for example, a cross flow fan) is installed in the automatic document feeder D, and the air outlet of the blower 109 is in the air which is in the upper cover portion 4 of the image reading device A. Intake hole 4a
It corresponds to. Further, inside the image reading device A, a wind guide for guiding the air coming in through the air intake hole 4a.
There are 13, 14 and the wind can be sent to the first mirror unit B having the illumination lamp 6. The wind guides 13 and 14 guide the wind to the first mirror unit B portion in the present embodiment, but it is optimal to guide the wind in the most effective direction and position without being particular about this.

The image reading device A conveys a document while the first mirror unit B and the second mirror unit C are both stopped at predetermined positions when the document is scanned by using the automatic document feeder D, that is, in the document moving / scanning mode. Since the scanning is performed by the scanning, the temperature of the image reading portion of the original platen glass 1, which always illuminates the same portion as the vicinity of the first mirror unit B having the illumination lamp 6, is so high that the wind flow to this portion is generated. By doing so, effective cooling can be performed.

Further, the blower 109 is required to operate at least in the original moving / scanning mode using the automatic document feeder, and even if the automatic document feeder D is attached, the original is placed on the original platen glass 1 so as to use the normal original pressing plate 2. The air blower 109 may be stopped when the document is read by the fixed document automatic scanning device D in the fixed document scanning mode.

FIG. 3 shows an example in which the wind from the blower 109 in the automatic document feeder D is divided by the wind guide 13a to cool and wind the inside of the automatic document feeder D at the same time. Effective use of the blower 109 You can

FIGS. 4 (a) and 4 (b) show an example in which the shutter 201 is attached to the main body under the air intake hole 4a of the exterior portion 4 of the image reading apparatus A by the pivot shaft 204.
FIG. 4 (a) shows a state in which the automatic document feeder D is constantly engaged with the shutter 201 and the document automatic feeder D is set in the image reading device A at 02. , There is a lever portion 203 that works to open the shutter 201, and when the automatic document feeder D is open (FIG. 4 (b)), or when the automatic document feeder D is removed, the original platen 2 is used. By closing the air intake hole 4a during the operation, it is possible to prevent the infiltration of dust and dirt.

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

Further, when the automatic document feeder D is attached to the image reading device A by the hinge 12 as shown in FIG. 2, the hinge portion may use the holes 3 and 3'common to those for the original pressure plate 2, so that the user can easily operate. It may be configured so that it can be placed on the image reading apparatus A later.

Although the present embodiment has been described with respect to the image reading device, it goes without saying that the same applies not only to a digital image reading device using a solid-state image pickup device but also to a copying machine or the like.

〔The invention's effect〕

According to the present invention, an automatic document feeder can be attached and a fixed document scanning mode in which a document is scanned by moving an optical illumination system, and a document automatic scanning device which scans a document while the optical illumination system is stopped at a predetermined position. In an image reading apparatus having a moving original scanning mode, a fan is provided in the automatic document feeder, and the image reading apparatus has an air intake port from the blower to blow air into the image reading apparatus for cooling. Since the image reading device can be attached to the automatic document feeder, the image reading device does not need to have a blower when the automatic document feeder is not attached, and the image reading device is more compact and less expensive. It is possible to provide an image reading device with a high degree of freedom. Further, even when an automatic document feeder as an application of the image reading device is retrofitted, the operator is not required to perform a complicated work such as installing a blower inside the image reading device, so that system up is easier. It is possible to provide an image reading device.

[Brief description of drawings]

1A is a vertical sectional view of an image reading apparatus according to an embodiment of the present invention, FIG. 1B is a plan view of FIG. 1A, and FIG. 1C is a document pressure plate mounting portion. FIG. 1 (d) is a perspective view of a mounting portion of a document pressure plate, FIG. 2 is a vertical sectional view of an image reading apparatus and a document automatic feeding apparatus according to an embodiment of the present invention, and FIG. 4 is a vertical sectional view of the automatic document feeder according to the embodiment of FIG.
(a), (b) is a longitudinal sectional view of an air intake portion of an image reading apparatus according to still another embodiment of the present invention. 4a ... hole for taking in air, 109 ... blower.

Claims (1)

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