JP2980753B2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus and a structure of an opening / closing plate provided inside or outside the image forming apparatus.

[0002]

2. Description of the Related Art For example, in an image forming apparatus such as a copying machine, there is known an image forming apparatus in which a cover for covering a side portion of the apparatus has an opening / closing structure for maintenance or the like. FIG. 8 shows an image forming apparatus 3 disclosed in Japanese Utility Model Laid-Open Publication No. 61-44653 .
5 shows an opening / closing structure of an opening / closing lid 36 (cover), and a printed circuit board 37 of an electric circuit is disposed on an inner surface of the opening / closing lid 36 which is opened / closed for maintenance. Regardless of this example, there are many cases where the mounting plate of the board is configured to be openable and closable so that the printed board and other boards superimposed on the inside of the device can be visually recognized during maintenance or the like.

[0003]

When the printed circuit board 37 (circuit board) serves to attach a printed circuit board 37 (circuit board) like the open / close lid 36 of the image forming apparatus 35 shown in FIG . 8 , the printed circuit board 37 is a primary side (power supply side). Many cases include both a circuit (for example, a voltage of 24 V is applied) and a secondary side (signal line side) circuit (for example, a voltage of 5 V is applied). A lot of leakage current and leakage flux are generated. Therefore, as described above, when a single printed circuit board 37 includes both the primary and secondary circuits, the delicate secondary circuit has leakage current from the primary side,
There is a problem that the leakage magnetic flux is transferred and causes noise. Also, as described above, the primary circuit operates at a high voltage and has a large current value, and thus generates a large amount of heat.
In the case where the printed circuit board 37 is included in the printed circuit board 37, there is a problem that even the secondary circuit that generates less heat is affected by the heat generated by the primary circuit and malfunctions. Further, in the mounting structure of the printed circuit board 37 shown in FIG. 8 , since all the printed circuit boards 37 are mounted on one side of the opening and closing cover 36, there is also a problem that the size of the opening and closing cover 36 increases with the enlargement of the printed circuit board 37.
This problem applies not only to the cover in which the circuit board mounting plate covers the outer surface of the image forming apparatus as shown in FIG. 8 , but also to the mounting plate mounted so as to partition the inside of the device. on the other hand,
As shown in FIG. 8 , the opening / closing lid 36 is integrated with the opening / closing part and is opened, for example, toward the operator.
When the maintenance work or the like is performed in the open state, the opening / closing lid 36 hinders the work, and a large dead space for opening is required. This situation is the same for the opening / closing plate that partitions the inside of the device so that it can be opened and closed. Accordingly, an object of the present application is to prevent the leakage current, the leakage flux, and the heat generated in the primary circuit from adversely affecting the secondary circuit, and to substantially reduce the mounting area of the circuit board. It is an object of the present invention to provide an image forming apparatus characterized by a circuit board mounting structure that can be used.

[0004]

Means for Solving the Problems The upper SL engagement Ru inventions in the present application to achieve the purpose, the first round of insulating comprising a metal plate
On the outer surface of the circuit board mounting plate and the first circuit board mounting plate.
A second-side substrate provided with a second-side circuit;
The primary circuit is attached to the inner surface of the circuit board
And an image forming apparatus main body.
A first opening / closing plate which can be opened and closed with respect to a metal plate;
An insulating second circuit board mounting plate including
Equipped with a primary circuit mounted on the outer surface of the circuit board mounting plate
And a second primary side substrate.
And is installed to be openable and closable on the same surface as the first opening and closing plate.
A second opening / closing plate, and the secondary substrate of the first opening / closing plate.
The second opening / closing plate is provided between the second opening / closing plate and a second primary side substrate.
From the second primary substrate to the secondary substrate.
An image forming apparatus comprising: an insulating shielding member for performing an effective shielding .

[0005]

According to the onset bright [action], absolute configured to include a metal plate
The primary circuit and the secondary circuit are separately mounted on the outer surface and the inner surface of the first circuit board mounting plate having an edge, so that the primary circuit can be electromagnetically connected to the secondary circuit. influence the above-mentioned first
The shielding effect of shielding by the first circuit board mounting plate is exhibited, and the area of the circuit board mounting plate can be reduced. Also,
Since the first circuit board mounting plate is configured to include a metal plate such as a plywood of a metal plate and an insulating plate, the heat radiation effect of the first circuit board minimizes the adverse effect of the heat generated by the primary circuit on the secondary circuit. Can be minimized. In addition, the first circuit
A second circuit board provided on the same surface as being separated from the board mounting plate
The primary board is attached to the outer surface of the board mounting plate,
Between the first and second circuit board mounting plates.
The secondary circuit of the first circuit board mounting plate
Side substrate and second primary side substrate of the second circuit board mounting plate
The effect of shielding electromagnetic and thermal effects is exhibited between
You. In addition, a first opening and closing operation including the first circuit board mounting plate
A second opening / closing plate including the second circuit board mounting plate;
Are installed separately, so that all
Opening and closing the above two types compared to when all circuit boards are attached
Dead space when opening the board is less than half
And contributes to the improvement of maintainability.
In addition, all circuit boards are mounted on a mounting plate that can be opened and closed.
This simplifies the assembly process,
The board can be easily removed together with the mounting plate.
The exchange work of the road board and the like are also facilitated.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Another embodiment will be described for the understanding of the present invention. still,
The following examples are examples embodying the present invention.
It is not intended to limit the technical scope of the invention. Here, Figure 1
~ Figure3Is an embodiment of the opening and closing structure of the device according to the embodiment of the present invention.
Opening / closing structure diagram showing mode4~ Figure7Is the internal configuration of the copier
In the example applied to4Opens and closes in partial front view of copier
Figure with parts closed5Is a figure4Open and close with side view of part shown
Figure with parts closed6Is a figure5Opening / closing part in side view
Open, figure7Is a figure4FIG. 6 is a rear view of the part shown in FIG.
In FIG. 1, one side of a device 1 showing a housing of the image forming apparatus.
Provide an opening / closing part on the surface to perform maintenance etc. inside the equipment 1.
When the opening / closing section 2 is closed, the horizontal opening L
2b, and the upper opening / closing plate 2a is directed upward in the horizontal axis direction.
Is opened by the hinge portion 3a, and the lower opening / closing plate 2b is
It is opened by the hinge part 3b in the direction. In FIG.
In the same manner as in the above, the opening / closing section 4 is defined by an upper opening / closing plate 4a and a lower opening / closing plate with a horizontal line L.
4b, and the lower opening / closing plate 4b is hinged in the horizontal axis direction.
It is opened and closed by the part 5b, but the upper opening and closing plate 4a is
It is configured to be opened and closed by the flange portion 5a. Image formation
In the device, important elements such as a paper feed unit are provided below the equipment 1.
It is necessary to perform the maintenance at the same time.
The opened lower opening / closing plate 4b can be rotated about a horizontal axis.
In order to reduce the dead space, the upper open / close plate 4a
Is opened sideways for maintenance.
You. In addition,3In, the opening / closing section 9 is positioned above the horizontal line L.
The opening / closing plate 9a and the lower opening / closing plate 9b are divided into two parts.
Is opened and closed by the hinge 10b in the horizontal axis direction.
The plate 9a is opened and closed by a hinge 10a in the vertical axis direction.
In addition, the upper opening / closing plate 9a is folded by the folding hinge portion 11 when opened.
It is configured to open while being folded. This allows
In the example shown in FIG.
Resources are saved. 1 to 1 above3Each opening and closing structure shown in
According to this, it is necessary to open the opening / closing parts 2, 4, 6, 9
Space is half as compared with the case where the
Minutes or less. In particular, the lower opening / closing plates 2b, 4b,
Less space for opening and closing 9b
Free space on one side of the device 1
Of the opening / closing part 2 which hinders the work.
There is also an advantage that projection is reduced.

Each of the opening / closing structures can be adopted in a structure suitable for the equipment to which the apparatus is applied. In addition to the opening / closing section as the outer cover of the equipment 1 as described above, the component parts configured inside the equipment 1 It can also be applied as an opening and closing structure for a mounting plate. 4 to 7 show an example in which a partition plate that partitions the inside of a copying machine as an example of an image forming apparatus is used as a mounting plate for a circuit board, and this mounting plate can be freely opened and closed. The opening and closing structure of the mounting plate employs, for example, the opening and closing structure shown in FIG. Figure
7 , a chassis 13 in the copying machine 12 has a photosensitive drum drive motor 14, a paper transport motor 15, a relay 1
6, a transformer 17 and the like. This chassis 1
As shown in FIG. 4 , FIG. 5 , and FIG. 6 , a printed circuit board 18 (corresponding to a secondary substrate) and a printed circuit board 22 (corresponding to a first primary substrate) are provided on the front side (front side). An upper opening / closing plate 19 (corresponding to a first opening / closing plate) attached to both sides, and a lower opening / closing plate 21 (a second opening / closing plate) having a printed circuit board 20 (corresponding to a second primary side substrate) attached to the front side. ) Are arranged. The upper opening / closing plate 19 is configured to be openable and closable about a vertical axis with the upper shaft support 23 as a rotation axis.
Is configured so that it can be opened and closed around a horizontal axis using the lower shaft support 24 as a rotation axis. The printed circuit board 18 attached to the upper opening / closing plate 19 is mainly composed of a signal circuit (secondary circuit).
The printed circuit board 20 attached to the lower opening / closing plate 21 mainly includes a power supply circuit (primary circuit). In order to prevent the electromagnetic influence from the power supply circuit and the like of the printed circuit board 20 from affecting the printed circuit board 18 on which the signal circuit and the like are formed, the upper and lower opening / closing plates 19 and 21 are both made of metal plates with insulating coating. In addition to having a structure, it is divided into an upper opening / closing plate 19 and a lower opening / closing plate 21 and a bent portion 25 for electromagnetic shielding and heat dissipation (corresponding to an insulating shielding member) is provided on the lower opening / closing plate 21.
Is provided. A printed circuit board 22 including a power supply circuit (primary circuit) is also mounted on the back of the upper opening / closing plate 19, but is shielded from the printed circuit board 18 including the signal circuit on the front side by the upper opening / closing plate 19 including a metal plate. Therefore, the configuration can be made without mutual interference due to the shielding effect and the heat radiation effect. Furthermore, components that generate a large amount of electromagnetic waves, such as the motors 14 and 15 and the transformer 17 attached to the chassis 13, are electromagnetically shielded by the chassis 13 and the upper and lower opening / closing plates 19 and 21. Can be configured with very little coverage. As described above, by configuring the mounting plates such as the printed circuit boards 18 and 20 as opening / closing plates, the inside of the device on which the component parts are superimposed can be opened at any time so that it can be easily inspected and repaired. Also, as described above, each circuit board has two
Since it is mounted on the upper and lower open / close plates 19 and 21 which are divided into two, the dead space when the two open / close plates are opened is smaller than when all the circuit boards are mounted on one open / close plate. Can be reduced to less than half, and maintenance is improved. Furthermore, since all the circuit boards are mounted on the openable upper / lower open / close plate 19 or the lower open / close plate 21, the assembly process can be simplified, and the circuit board can be easily removed together with the open / close plate. Substrate replacement work and the like are also facilitated. The above example
The opening and closing structure shown in FIG. 2 used in FIG.
Even if it is replaced with a structure, it is attached to the front and back of the upper opening / closing plate 19.
Printed circuit board 18 (secondary circuit) and printed circuit board 2
Shield effect and heat radiation effect between 2 (primary circuit)
The printed circuit board 18 (two
Next circuit) and the pudding attached to the surface of the lower opening / closing plate 21
Electromagnetic force by the bent portion 25 between the substrate 20 (primary circuit)
Shielding and heat dissipation effect, dead space reduction effect, circuit board
The simplification of the work of exchanging the boards and the like are similarly achieved.

[0008]

As described above, according to the present invention, the first
The circuit board mounting plate is composed of a metal plate and the outside of the mounting plate.
By separately mounting the secondary board and the primary board on the surface and the inner surface, respectively, the effect of shielding or radiating the electromagnetic or thermal effect of the primary circuit on the secondary circuit by the mounting plate is reduced. Further, since both surfaces of the circuit board can be used as the mounting surface, the effect of reducing the area of the mounting plate is exhibited. Ma
In addition, it is provided on the same surface separately from the first circuit board mounting plate.
The primary circuit board is mounted on the outer surface of the second circuit board mounting plate
Between the first and second circuit board mounting plates.
Since the insulating shielding member is provided in the first
Secondary board of road board mounting plate and second circuit board mounting plate
And / or thermal effects even with the second primary side substrate
The effect of shielding the influence is exerted. In addition, the first
A first opening / closing plate including a circuit board mounting plate, and the second circuit
The second opening / closing plate including the substrate mounting plate is separately mounted.
All circuit boards are mounted on one open / close plate
When opening the two open / close plates, the data
Memory space can be reduced to less than half,
It also contributes to improved tenability. In addition, all circuit boards
Is mounted on a mounting plate that can be opened and closed.
The erecting process is simplified, and the circuit board is easy with the mounting plate
Circuit board replacement
It will be easier.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a device opening / closing structure according to an embodiment of the present invention (first embodiment).

FIG. 2 is a schematic perspective view of a device opening / closing structure according to an embodiment of the present invention (second embodiment).

FIG. 3 is a schematic perspective view of a device opening / closing structure according to an embodiment of the present invention (third embodiment).

FIG. 4 is a partial front view of an embodiment in which the present invention is applied to a copying machine, showing a state in which an opening / closing unit is closed.

FIG. 5 is a side view of the state shown in FIG. 4;

FIG. 6 is a side view showing a state where the opening / closing unit is opened from the state shown in FIG. 5;

FIG. 7 is a rear view of the state shown in FIG. 4;

FIG. 8 is a perspective view of an image forming apparatus showing an example of a conventional opening / closing structure .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Device 2, 4, 9 ... Opening / closing part 2a, 4a, 9a, 19 ... Upper opening / closing board 2b, 4b, 9b, 21 ... Lower opening / closing board 3a, 5a, 10a ... Upper hinge part 3b, 5b, 10b ... Lower hinge Part 11: Folding hinge part 23: Upper shaft support 24: Lower shaft support L: Horizontal line

Continuation of the front page (56) References JP-A-63-119298 (JP, A) JP-A-62-48090 (JP, A) JP-A-3-611956 (JP, A) JP-A-3-62046 (JP) JP-A-62-37998 (JP, A) JP-A-60-37564 (JP, A) JP-A-5-27487 (JP, A) Fully open Showa 61-44653 (JP, U) Really open 62-120752 (JP, U) Japanese Utility Model Hei 2-8099 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03G 15/00 550 G03G 21/16-21/18 H05K 5 / 00 H05K 9/00

Claims (1)

(57) [Claims] 1. An insulating first circuit board including a metal plate.
Attached to the outer surface of the first circuit board mounting plate.
A secondary circuit board having a secondary circuit and the first circuit board.
A first circuit mounted on the inner surface of the plate mounting plate and having a primary circuit;
With the primary side substrate, and
A first opening / closing plate that can be opened and closed , an insulating second circuit board mounting plate including a metal plate,
The primary circuit mounted on the outer surface of the circuit board mounting plate
And an image forming apparatus
Installed so that it can be opened and closed on the same surface as the first opening and closing plate with respect to the body
A second opening / closing plate, the secondary substrate of the first opening / closing plate, and the second opening / closing plate
The second primary side substrate is provided between the second primary side substrate and the second primary side substrate.
Insulation for electromagnetic shielding from the side substrate to the secondary side substrate
An image forming apparatus comprising: a shielding member .