JPH10105027A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the cooling effect of a fan at the inside of a device and to prevent malfunction caused by the interference of radiation noise. SOLUTION: This device possesses the fan 26, a power source unit 25 arranged on the upstream side of the fan 26, an air suction port 37 opened on the upstream side of the power source unit 25 and a controller board controlling an electric signal. In this case, a stay 27 partitioning the power source unit 25 and the controller board is provided, and the power source unit 25 is covered with cylindrical sheet metal by the combination of the stay 27 and the armor sheet metal of the power source unit 25. Thus, the power source unit 25 is efficiently cooled, and also the controller board is efficiently cooled by preventing the flow of warm air from the power source unit 25 to the side of the controller board by the stay 27, so that the cooling effect of the fan 26 at the inside of the device is enhanced, and also the interference of the radiation noise is reduced by the stay 27, so that the malfunction of the device caused by the radiation noise is prevented.

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 provided with a fan for discharging air inside the apparatus to the outside of the apparatus.

[0002]

2. Description of the Related Art In an image reading apparatus provided in an image processing apparatus such as a facsimile machine, a fan is provided to prevent the temperature inside the apparatus from excessively rising due to heat from various electric devices which are heat-generating components. The warm air is discharged out of the apparatus, but conventionally all electric devices in the apparatus are simply cooled by one air flow.

[0003]

However, in the above-described conventional image reading apparatus, the temperatures of electric components such as a power supply unit and a controller board in the apparatus which have different temperature rises interfere with each other. Will be. For this reason,
Warm air generated from the power supply unit, which tends to be the highest in temperature, flows into a relatively heat-sensitive motherboard or the like, which lowers the cooling effect of the controller board.

Further, in the conventional image reading apparatus, the power supply unit, which tends to increase in temperature, is not covered with a sheet metal or the like and is directly exposed in the apparatus. The cooling means such as a fan for discharging the air outside the apparatus wastes. Therefore, to surely cool the inside of the apparatus, a larger fan had to be installed.

Further, since the conventional image reading apparatus is not provided with a stay for covering the power supply unit, radiation noise generated from each of the power supply unit and the controller board interferes with each other and causes a malfunction of the apparatus. I was

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an image reading apparatus which can enhance a cooling effect of the inside of the apparatus by a fan and can prevent a malfunction caused by interference of radiation noise. To provide.

[0007]

In order to achieve the above object, the invention according to claim 1 provides a fan for discharging air inside the apparatus to the outside of the apparatus, and a power supply unit disposed upstream of the fan. And, in an image reading apparatus having an air suction port opened on the upstream side of the power supply unit and a controller board for controlling an electric signal, a stay for separating the power supply unit and the controller board is provided,
The power supply unit is covered with a tubular sheet metal by a combination of the stay and an exterior sheet metal of the power supply unit.

According to a second aspect of the present invention, there is provided a fan for discharging air inside the apparatus to the outside of the apparatus, a power supply unit disposed upstream of the fan, and an air suction opening opening upstream of the power supply unit. An image reading apparatus having a mouth and a controller board for controlling an electric signal, a stay for separating the power supply unit and the controller board is provided, and the air flow in the apparatus by the fan is controlled by the stay on the power supply unit side and the controller board. It is characterized in that it is configured to diverge to the side.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the exterior sheet metal of the power supply unit is formed to have a substantially U-shaped cross section.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the exterior sheet metal of the power supply unit is formed to have a substantially L-shaped cross section.

According to a fifth aspect of the present invention, in the first or second aspect of the present invention, the exterior sheet metal of the power supply unit is formed to have a substantially I-shaped cross section.

Therefore, according to the present invention, since the power supply unit is covered with the tubular sheet metal, the flow path of the cooling air is formed by the tubular sheet metal, and the power supply unit is efficiently made by the air flowing through the flow path. The stays block the flow of warm air from the power supply unit to the controller board side, and the controller board is cooled efficiently, so that the cooling effect in the device by the fan is enhanced and interference of radiated noise is caused. Is reduced by the stay, and malfunction of the device due to radiation noise can be prevented.

[0013]

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

FIG. 1 is a perspective view of an image reading apparatus (network image scanner) according to the present invention, FIG. 2 is a perspective view of an image reading section of the image reading apparatus, and FIG. 3 is an exploded perspective view of the image reading section. .

An image reading apparatus 100 shown in FIG. 1 is configured by combining a document feeder 1 and an image reading section (flatbed scanner) 2 as reading means, and a document placed above the image reading section 2. Documents set on the feeder 1 are separated and fed one by one by a separating unit (not shown), and are conveyed to a reading unit (not shown). Then, while the original is conveyed through the reading means, the image reading unit 2 reads the recorded information of the original by flowing reading.

The image reading section 2 can automatically feed and read a document by the document feeder 1. When the document feeder 1 is opened, the platen glass 5 of the image reading section 2 is exposed. It is also possible to place a document directly on (see FIG. 2) and read it.

Next, the configuration of the image reading section 2 will be described.

FIG. 3 is an exploded perspective view showing the structure of the image reading section 2.

The image reading section 2 comprises a scanner section 6 and an electronics unit 3, and the scanner section 6 is arranged above the electronics unit 3.
Note that the electronics unit 3 incorporates various boards for transmitting the document recording information to a network computer (not shown).

The scanner unit 6 and the electronic unit 3 are connected by a plurality of screws 8. At this time, in order to prevent the scanner unit 6 from being attached to the electronic unit 3 in a state where the scanner unit 6 is deformed due to a problem of flatness or component accuracy of the electronic unit 3 and the scanner unit 6, the mounting error between the electronic unit 3 and the scanner unit 6 is reduced. An adjustment mechanism 9 shown in FIG. 4 for absorbing is provided in the electronic unit 3.

The adjusting mechanism 9 absorbs backlash by adjusting up and down the play when the scanner section 6 is attached to the electronic unit 3 when the play occurs. By performing this adjustment, it is possible to prevent quality deterioration of the read image (for example, deterioration of image quality such as poor linearity, perpendicularity or parallelism, and uneven density) due to distortion of the scanner unit 6.

FIG. 5 is an exploded perspective view showing the structure of the electronic unit 3.

In FIG. 5, reference numeral 10 denotes a control circuit board;
Is a wire holding member for fixing the wires, 11 is a flat cable, and 12 is a flat cable protection bush.

The flat cable 11 is connected to a motherboard 34 (see FIGS. 7 and 11), which will be described later. 3, 6 and 7).
The flat cable protection bush 12 is provided on the electronic unit 3 so that the flat cable 11 is not damaged by the edge of the sheet metal when the flat cable 11 is wired from above the electronic unit 3 to the inside of the electronic unit 3. Is to protect.

Reference numeral 15 denotes a power supply bundle connecting the power supply unit 25 provided on the drawer tray 7 inside the electronic unit 3 and the control circuit board 10, and reference numeral 16 denotes a power supply bundle 15 from the upper part of the electronic unit 3 to the inside of the electronic unit 3. The cable protection bush 18 is provided on the electronics unit 3 so that the power supply bundle 15 is not damaged by the edge of the sheet metal when wiring is performed. The four rubber protection legs 18 are provided on the bottom of the electronics unit 3. And this rubber foot 18
A gap of about 10 mm is secured between the device and the device mounting surface.

The above gap makes it easy to put a finger on the bottom of the image reading device 100 when carrying the image reading device 100 by hand.
This is a contrivance to make it easier to carry the image reading device 100 and to move it. In addition, a gap is provided between the suction ports when the air to be passed through the inside of the device is sucked by the fan 26 described later.

Further, in FIG. 5, reference numeral 19 denotes a board press, which regulates the movement of a riser board 35 (see FIGS. 7 and 14) described later provided on the drawer tray 7 in the vertical and horizontal directions. The riser board 35 is provided in the electronics unit 3 so that the riser board 35 does not come off even when the 100 is affected by an external influence such as vibration or dropping, and details thereof are shown in FIG.

As shown in FIG. 14, a groove 19a having a substantially concave shape is formed in the substrate holder 19 provided on the upper surface inside the electronic unit 3.
Is engaged with the upper portion of the riser board 35, thereby preventing the riser board 35 from dropping out of the insertion slot portion 34-1.

The drawer tray 7 is provided so as to be able to be pulled out to the rear side with respect to the front of the image reading apparatus 100. When the drawer tray 7 is pulled out, the substrate holder 19 is moved to the electronic unit as shown in FIG. 3, the riser board 35 can be easily inserted into the insertion slot 34-1.
It can be extracted from. With this configuration, when it becomes necessary to remove the riser board 35, it can be easily removed, so that the workability is improved and the riser board 35 is not damaged. In FIG. 5, reference numeral 14 denotes a screw for attaching the board presser 19.

FIG. 6 is an exploded perspective view showing the structure of the drawer tray 7.

In FIG. 6, reference numeral 25 denotes a power supply unit. The power supply unit 25 includes a control circuit board 10 of the scanner unit 6, various network-related boards to be described later, and a fan 2.
6 and the like. Reference numeral 27 denotes a stay for securing the rigidity of the drawer tray 7 and for attaching the power supply unit 25.

The power supply unit 25 is assembled so that the stay 27 constitutes the remaining one surface (opening surface) of the exterior sheet metal 25-1 formed into a substantially U-shaped cross section on three sides. It is formed in a letter shape (cylindrical shape), and the inside thereof forms a flow passage through which cooling air passes. By configuring the power supply unit 25 in this manner, the air inside the device is efficiently discharged to the outside of the device by the fan 26,
Excessive temperature rise in the device is effectively prevented.

The power supply unit 25 is controlled by the stay 27.
And a network-related board such as a motherboard 34 and a hard disk 33, which will be described later, so that the flow of air discharged out of the apparatus by the fan 26 passes through the power supply unit 25 as indicated by an arrow in FIG. And the air flow B passing through a network-related board such as the motherboard 34 can be divided, and the cooling efficiency of the fan 26 can be increased.

Further, the power supply unit 2 is
5 and the network-related boards such as the motherboard 34 are completely separated, so that radiation noise can be reduced, and malfunction of the device due to radiation noise can be prevented.

On the other hand, in FIGS. 6 and 7, reference numeral 28 denotes a hard disk holder for holding the hard disk 33. When the hard disk 33 is mounted on the drawer tray 7, the hard disk 33 is mounted on the hard disk holder 28 alone. Hard disk holder 2
By assembling the hard disk 33 with the stay 27 as a unit,
And it is comprised so that it can be installed reliably.

Reference numeral 29 denotes a bundle protection bush provided on the stay 27 so as to prevent the bundle from being damaged by the edge of the sheet metal when the bundle from the power supply unit 25 is passed through the hole 31 formed in the stay 27. Reference numeral 30 denotes a bundle holder, and the bundle holder 30 is connected to the hole 31 from the power supply unit 25.
In order to prevent variation and flapping of the bundles connected to the control circuit board 10 (see FIG. 5) of the scanner unit 6, various network-related boards, the fan 26, etc. through the bundle protection bush 29 assembled in the scanner unit 6, the bundles are held. And two are attached to the stay 27.

Further, in FIG. 6, reference numeral 32 denotes a screw for fixing the fan 26 to the drawer tray 7;
A plurality of air suction ports for sucking air into the apparatus, and a hard disk which forms an air passage by arranging these air suction ports 37 on the front side of the apparatus with respect to the fan 26 arranged on the back of the apparatus. It is possible to prevent an excessive increase in the temperature of electrical devices such as the 33, the motherboard 34, the network board 36, and the power supply unit 25, which tend to increase in temperature. Although not shown, a similar air suction port is also formed on the bottom surface of the electronic unit 3.

FIG. 7 is a perspective view showing a state in which various network boards are incorporated in the drawer tray 7.

In FIG. 7, 33 is a hard disk, 3
4 is a motherboard, 35 is a riser board, and 36 is a network board. Note that these electrical configurations will be described later.

Numeral 38 denotes a box-shaped member for mounting the network board 36. This box-shaped member is embedded inside the device to prevent a connector (not shown) connected to the network board 36 from protruding outside the device. Is composed. By putting a finger inside the concave portion of the box-shaped member 38, the carrying of the entire image reading apparatus 100 is facilitated in combination with the use of the gap by the rubber legs 18 described above.

The box-shaped member 38 is formed with a finger hooking narrowing portion 39. By hooking a finger on the finger hooking narrowing portion 39, the drawer tray 7 can be easily pulled out rearward with respect to the front of the apparatus. In addition, the workability of replacing parts such as the hard disk 33 and the network board 36 in the drawer tray 7 that may need to be replaced can be improved, and the number of parts can be reduced.
Further, with this configuration, it is not necessary to remove the exterior or the like at the time of replacement of internal parts, etc., so that there is no possibility that the device will be damaged or damaged. Although a space for temporarily placing the exterior and the like is required, this configuration can simply save the space of the drawer tray 7 because the drawer tray 7 is simply pulled out.

The power supply unit 25 provided in the drawer tray 7 supplies power to the document feeder 1, the image reading section 2, and all the network-related components such as the motherboard 34 and the hard disk 33. The size of the device 100 is reduced.

8 is a perspective view of the power supply unit 25, FIG. 9 is a view in the direction of arrow C in FIG. 8, and FIG. 10 is a view similar to FIG. 9 with some parts removed.

In FIG. 9, reference numeral 40 denotes a power inlet, 4
Reference numeral 1 denotes a power switch, which is indicated by an arrow D shown in FIG.
The power supply unit 25 can be easily attached to the power supply unit 25 only by sliding the power supply unit 25 from the direction and fitting the power supply unit 25 to the drawer tray 7. They are fixed to the drawer tray 7 by tightening. With such a configuration, the power supply inlet 40 and the power switch 41 can be incorporated into the device together with the operation of mounting the power supply unit 25, and the work efficiency can be improved.

FIG. 11 is an electrical block diagram of the image reading apparatus 100 according to the present embodiment.

In FIG. 11, 25 is a power supply unit, 2
Reference numeral 6 denotes a fan, which can force the air to flow through the inside of the apparatus by the fan 26 to prevent an excessive rise in temperature inside the apparatus.

Reference numeral 34 denotes a motherboard for controlling the image reading apparatus 100 in accordance with control means stored in a ROM 42 and a hard disk drive, which will be described later. Reference numeral 42 indicates that the motherboard 34 operates as a control unit for controlling the entire image reading apparatus 100. And a hard disk unit 33 for storing a program for the motherboard 34 to control other peripheral devices and an image data sent from the scanner unit 6.

Further, reference numeral 2 denotes an image reading unit for reading an original in accordance with a command from the motherboard 34, converting the read image into digital data and transferring the digital data to the motherboard 34, and 1-1 includes an operation unit and a display unit. A control panel 36 for checking the operation of the image reading apparatus 100 and the state of the image processing apparatus 100; and 36 is an extended LAN for connecting the image reading apparatus 100 to a network.
Card (network board).

Next, the stopper structure of the drawer tray 7 is shown in FIG.
2 and FIG. FIG. 12 is a side view of the drawer tray 7, and FIG. 13 is a partial cross-sectional view showing an engagement state of the stopper 43 with the electronic unit 3.

12 and 13, reference numeral 43 denotes a stopper. The stopper 43 pulls out the drawer tray 7 from the electronic unit 3 with excessive force when pulling out the drawer tray 7 from the electronic unit 3 on which various wirings are provided. This is to prevent passing. Two stoppers 43 are provided at the bottom of the drawer tray 7, and as shown in FIG. 13, the stoppers 43 are dropped into holes 3-1 formed at the bottom of the electronic unit 3, so that the drawer tray 7 is pulled out at a stretch. To prevent them from getting lost. In other words, the stopper surface 43-1 of the stopper 43 is the hole 3 of the electronic unit 3.
The edge of the drawer tray 7 is stopped by engaging with the edge of -1. When it is desired to completely pull out the drawer tray 7, it is only necessary to lift the entire drawer tray 7 slightly upward after removing a part of the connectors of various wirings. Then, since the stopper 43 comes off the hole 3-1 of the electronic unit 3, the drawer tray 7 can be completely pulled out.

In this embodiment, the improvement of the cooling efficiency in the case where the exterior metal plate 25-1 supporting the power supply unit 25 is formed in a substantially U-shaped cross section as shown in FIG. 15 has been described. Even when the exterior sheet metal 25-2 is formed into a substantially L-shaped cross section as shown in FIG. 16, or when the exterior sheet metal 25-3 is formed into a substantially I-shaped cross section as shown in FIG. By combining 25-2 and 25-3 with stays 27 and 27-1 and base material 7-1, power supply unit 2 is provided.
If 5 is formed in a substantially rectangular shape in cross section, the same effect as described above can be obtained.

[0052]

As is apparent from the above description, according to the present invention, according to the present invention, since the power supply unit is covered with the tubular sheet metal, the flow path of the cooling air is formed by the tubular sheet metal. The power supply unit is efficiently cooled by the air that is formed and flows through the flow path, and the flow of warm air from the power supply unit to the controller board side is blocked by the stay, so that the controller board is efficiently cooled. As a result, the effect of cooling the inside of the device can be enhanced, and interference of radiated noise can be reduced by the stay, so that malfunction of the device due to the radiated noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of an image reading apparatus (network image scanner) according to the present invention.

FIG. 2 is a perspective view of an image reading unit of the image reading apparatus according to the present invention.

FIG. 3 is an exploded perspective view of an image reading unit of the image reading device according to the present invention.

FIG. 4 is a side view of an electronic unit illustrating an adjustment mechanism.

FIG. 5 is an exploded perspective view of the electronic unit.

FIG. 6 is an exploded perspective view of the drawer tray.

FIG. 7 is a perspective view showing a state where various network boards are incorporated in a drawer tray.

FIG. 8 is a perspective view of a power supply unit.

9 is a view in the direction of arrow C in FIG. 8;

FIG. 10 is a view similar to FIG. 9 with some parts removed.

FIG. 11 is an electrical block diagram of the image reading apparatus according to the present invention.

FIG. 12 is a side view of the drawer tray.

FIG. 13 is a partial cross-sectional view showing a state where the stopper is engaged with the electronics unit.

FIG. 14 is a detailed cross-sectional view of the substrate holder.

FIG. 15 is a cross-sectional view illustrating a shape of an exterior sheet metal of the power supply unit according to the embodiment of the present invention.

FIG. 16 is a cross-sectional view showing an outer sheet metal shape of a power supply unit according to another embodiment of the present invention.

FIG. 17 is a cross-sectional view showing an outer sheet metal shape of a power supply unit according to another embodiment of the present invention.

[Description of Signs] 1 Document feeder 2 Image reading unit 25 Power supply unit 25-1 to 25-3 Exterior sheet metal 26 Fan 27, 27-1 Stay 34 Motherboard (controller board) 37 Air suction port 100 Image reading device

Claims (5)

[Claims] 1. A fan for discharging air inside the device to the outside of the device, a power supply unit disposed upstream of the fan, an air suction opening opening upstream of the power supply unit,
In an image reading apparatus having a controller board for controlling an electric signal, a stay for partitioning the power supply unit and the controller board is provided, and the power supply unit is formed of a tubular sheet metal by a combination of the stay and an exterior sheet metal of the power supply unit. An image reading device characterized by being configured to cover. 2. A fan for discharging air inside the device to the outside of the device, a power supply unit disposed upstream of the fan, an air suction opening opening upstream of the power supply unit,
An image reading apparatus having a controller board for controlling an electric signal, wherein a stay for separating the power supply unit and the controller board is provided, and the flow of air in the apparatus by the fan is caused by the stay to the power supply unit side and the controller board side. An image reading device, wherein the image reading device is configured to diverge. 3. The image reading device according to claim 1, wherein the exterior sheet metal of the power supply unit is formed to have a substantially U-shaped cross section. 4. An exterior sheet metal of the power supply unit is substantially L-shaped in cross section.
3. The image reading device according to claim 1, wherein the image reading device is formed in a character shape. 5. An exterior sheet metal of the power supply unit is substantially I-shaped in cross section.
3. The image reading device according to claim 1, wherein the image reading device is formed in a character shape.