Circuit board mounting device

Abstract

To prevent an object falling from an upper side due to work from entering a gap between a circuit board and a mounting plate in comparison with a case where a shield member is not provided for shielding at least a part of a course along which the object moves toward the gap, in a circuit board mounting device comprising the circuit board, the mounting plate for mounting the circuit board and a structure which is disposed at an upper side of the circuit board and for which the work is required.SOLUTION: A circuit board mounting device 1 comprises: circuit boards 3A and 3B; mounting plates 4A and 4B which mount the circuit boards 3A and 3B; a structure 5 which is disposed at an upper side of the circuit boards 3 and for which work is required; and a shield member 6 which is provided in at least a part of a range from the structure 5 to the circuit boards 3 and shields at least a part of a course along which an object falling from an upper side moves toward gaps S1 and S2 between the circuit boards 3 and the mounting plates 4.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a circuit board equipment device.

Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2018-125609 as Patent Document 1 describes an image reading device. Patent Document 1 describes that the image reading device includes a sheet conveyance unit, a reading unit that reads an image of a sheet, a drive unit that transmits power to the conveyance unit, a first cover, and a second cover. The first cover is a cover that covers a part of the sheet conveyance path when displaced to the closed position and exposes a part of the conveyance path to the outside when displaced to the open position. The second cover is a cover provided at a position adjacent to the first cover in the closed position and covering the drive unit. Further, Patent Document 1 also describes that in the image reading device, the second cover has a partition wall disposed at a position separating the drive unit and the conveyance path, and a first gap is provided between the partition wall and another member disposed below the partition wall to communicate the spaces on both sides sandwiching the partition wall, or the structure is such that the first gap can be formed. Furthermore, Patent Document 1 also describes that in the image reading device, a second gap is provided between the first cover in the closed position and the partition wall, or the structure is such that the second gap can be formed, and a receiving portion for receiving foreign matter that falls downward through the second gap is provided at a position directly below the second gap and above the first gap.

[0003] Japanese Unexamined Patent Application Publication No. 2016-159986 as Patent Document 2 describes a sheet conveyance device. Patent Document 2 describes that the sheet conveying device includes a sheet stacking portion, a feeding means for feeding the sheets stacked on the stacking portion, a conveying guide provided on the downstream side of the feeding means, a sensor, a control board, a protection member, and a sensor unit. The above sensor is a sensor that detects a sheet being conveyed through an opening provided in the conveying guide. The above control board is a board on which elements of the sensor are provided. The above protection member is a member provided so as to cover the elements. The above sensor unit is a unit disposed under the conveying guide. Also, Patent Document 2 describes that in the above sheet conveying device, the protection member includes an abutting portion that abuts against the upper surface of the control board and a claw-shaped engaging portion that engages with the lower surface of the control board.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to prevent an article falling from above during work from entering the gap between a circuit board and a mounting board in a circuit board equipment device including a circuit board, a mounting board for mounting the circuit board, and a structure disposed above the circuit board that requires work. Another object of the present invention is to prevent an article falling from above during work from entering the gap between a circuit board and a mounting board, and to be able to prevent it compared to the case where no blocking member is provided that blocks at least a part of the path of the article toward the gap.

Means for Solving the Problems

[0006] The first means of the present invention is a circuit board, a mounting plate for mounting the circuit board, a structure arranged above the circuit board and requiring work, a blocking member provided in at least a part of the range from the structure to the circuit board, and blocking at least a part of the path along which an article falling from above due to the work heads toward the gap between the circuit board and the mounting plate, and is a circuit board equipment device comprising the above.

[0007] The second means of the present invention is, in the circuit board equipment device of the first means described above, the circuit board is arranged in a positional relationship such that a plane intersecting the depth direction from the circuit board toward the mounting plate exists inside the maximum width in the horizontal direction of a portion of the structure intersecting the depth direction, and the blocking member is a circuit board equipment device provided with a width equal to or greater than the width corresponding to the maximum width in the horizontal direction of the plane of the circuit board intersecting the depth direction.

[0008] The third means of the present invention is, in the circuit board equipment device of the first means described above, the circuit board is arranged in a positional relationship such that a part of a plane intersecting the depth direction from the circuit board toward the mounting plate exists inside the maximum width in the horizontal direction of a portion of the structure intersecting the depth direction, and the blocking member is a circuit board equipment device provided with a width equal to or greater than the width corresponding to the part of the plane of the circuit board.

[0009] The fourth means of the present invention is, in the circuit board equipment device of the first means described above, the circuit board is arranged in a positional relationship such that a plane intersecting the depth direction from the circuit board toward the mounting plate overlaps with and exists with a width wider than the maximum width in the horizontal direction of a portion of the structure intersecting the depth direction, and the blocking member is a circuit board equipment device provided with a width equal to or greater than the maximum width of the structure.

[0010] The fifth means of the present invention is in the circuit board mounting device of the first means, the cutoff member is a circuit board mounting device provided within a lower half range that does not include an intermediate position between the structure and the circuit board.

[0011] The sixth means of the present invention is in the circuit board mounting device of the first means, the cutoff member is a circuit board mounting device provided with a dimension longer than the depth dimension of the gap in the depth direction horizontally from the circuit board toward the mounting plate.

[0012] The seventh means of the present invention is in the circuit board mounting device of the first means, the cutoff member is a circuit board mounting device provided in a state where the gap is not visible through the cutoff member when viewed from vertically above downward.

[0013] The eighth means of the present invention is in the circuit board mounting device of the first means, the cutoff member is a circuit board mounting device having an upper surface portion formed of a downwardly inclined slope that inclines downward as it passes through and separates from the circuit board from the mounting plate.

[0014] The ninth means of the present invention is in the circuit board mounting device of the first means, the cutoff member is a circuit board mounting device having an upper surface portion provided with an upwardly inclined slope at an end away from the mounting plate.

[0015] The tenth means of the present invention is in the circuit board mounting device of the first means, the cutoff member has an end where the wiring cable approaches or contacts and passes through, and the end is formed in a bent shape.

[0016] The eleventh means of the present invention is in the circuit board mounting device of the first means, As the circuit board, it has a front - side circuit board arranged on the front - side that is first exposed to the outside, and a rear - side circuit board arranged deeper than the front - side circuit board and difficult to visually recognize from the outside. As the mounting plate, it has a front - side mounting plate for mounting the front - side circuit board and a rear - side mounting plate for mounting the rear - side circuit board. As the blocking member, in at least a part of the range from the structure to the front - side circuit board and the rear - side circuit board, an intermediate blocking member is additionally provided to block at least a part of the inner - side first path along which an article falling from above heads towards the gap between the front - side mounting plate and the rear - side circuit board. This is a circuit board equipment device.

[0017] The 12th means of the present invention is in the circuit board equipment device of the 11th means described above. As the blocking member, in at least a part of the range from the structure to the front - side circuit board and the rear - side circuit board, an inner - side blocking member is additionally provided to block at least a part of the inner - side second path along which an article falling from above heads towards the gap between the rear - side circuit board and the rear - side mounting plate. This is a circuit board equipment device.

[0018] The 13th means of the present invention is in the circuit board equipment device of the 1st means described above. As the circuit board, it has a circuit board that requires cooling. It is equipped with a blower fan arranged in a state of overlapping above a part of the upper end of the circuit board that requires cooling. The blocking member is provided so as to exist at least in a part of the circuit board that requires cooling except for the above - mentioned part of the upper end. This is a circuit board equipment device.

[0019] The 14th means of the present invention is in the circuit board equipment device of the 13th means described above. It is equipped with an opposing plate arranged facing the circuit board that requires cooling. In at least a part of the region of the opposing plate facing the circuit board that requires cooling, ventilation holes are provided. This is a circuit board equipment device.

[0020] The 15th means of the present invention is in the circuit board mounting device of any one of the means from the above-mentioned 1st means to the above-mentioned 14th means, The circuit board mounting device in which the structure is arranged in a state where a first virtual plane that virtually extends vertically downward from the portion that requires the work overlaps at least a part of the gap or is arranged behind the gap.

[0021] The 16th means of the present invention is in the circuit board mounting device of any one of the means from the above-mentioned 1st means to the above-mentioned 14th means, The circuit board mounting device in which the structure is arranged behind the circuit board.

[0022] The 17th means of the present invention is in the circuit board mounting device of the above-mentioned 16th means, The circuit board mounting device in which the structure is arranged behind a second virtual plane that virtually extends vertically upward from the upper end of the circuit board.

Advantages of the Invention

[0023] According to the circuit board mounting device of the above-mentioned 1st means, it is possible to prevent an article that falls from above due to work from entering the gap between the circuit board and the mounting plate, compared with the case where no blocking member is provided to block at least a part of the path of the article toward the gap.

[0024] According to the circuit board mounting device of the above-mentioned 2nd means, it is possible to prevent a falling article from entering the gap between the circuit board and the mounting plate, compared with the case where the blocking member is provided with a width narrower than the width corresponding to the maximum width of the circuit board.

[0025] According to the circuit board mounting device of the above-mentioned 3rd means, it is possible to prevent a falling article from entering the gap between the circuit board and the mounting plate, compared with the case where the blocking member is provided with a width narrower than the width where a part of the plane intersecting the depth direction of the circuit board exists inside the maximum width of the structure.

[0026] According to the circuit board mounting device of the fourth means described above, compared with the case where the blocking member is provided with a width narrower than the maximum width of the structure, it becomes easier to prevent the falling article from entering the gap between the circuit board and the mounting plate.

[0027] According to the circuit board mounting device of the fifth means described above, compared with the case where the blocking member is provided within the lower half range not including the intermediate position, the falling article can be blocked from the path towards the gap between the circuit board and the mounting plate at an early stage when it starts to fall.

[0028] According to the circuit board mounting device of the sixth means described above, compared with the case where the blocking member is provided with a dimension shorter than the depth dimension of the gap, it becomes easier to prevent the article falling from above from entering the gap between the circuit board and the mounting plate.

[0029] According to the circuit board mounting device of the seventh means described above, compared with the case where the blocking member is provided in a state where at least a part of the gap is visible when viewed from above in the vertical direction, it becomes easier to prevent the article falling from above from entering the gap between the circuit board and the mounting plate.

[0030] According to the circuit board mounting device of the eighth means described above, compared with the case where the blocking member does not have an upper surface portion formed of a downward slope, there is no risk that the article falling on the blocking member will stay on the upper surface portion of the blocking member.

[0031] According to the circuit board mounting device of the ninth means described above, when two or more circuit boards are arranged with a vertical shift below the blocking member, compared with the case where the blocking member does not have an upper surface portion provided with an upward slope portion, it is possible to suppress the article falling on the blocking member from being retained and re-falling.

[0032] According to the circuit board mounting device of the tenth means described above, compared with the case where the end portion of the blocking member where the wiring cable approaches or contacts and passes is not in a bent shape, the risk of the wiring cable being damaged by contacting the end portion of the blocking member is reduced.

[0033] According to the circuit board mounting device of the 11th means described above, compared with the case where the intermediate blocking member is not additionally provided as the blocking member, it is possible to prevent the falling article from entering the gap between the front mounting plate and the rear circuit board.

[0034] According to the circuit board mounting device of the 12th means described above, compared with the case where the rear blocking member is not additionally provided as the blocking member, it is possible to prevent the falling article from entering the gap between the rear circuit board and the rear mounting plate.

[0035] According to the circuit board mounting device of the 13th means described above, compared with the case where the blocking member is not provided in the upper part of the upper end of the circuit board that requires cooling, excluding the part where the blower fans are overlapped, it is easier to cool the circuit board that requires cooling with the airflow generated by the blower fans.

[0036] According to the circuit board mounting device of the 14th means described above, compared with the case where no ventilation holes are provided in at least a part of the region of the opposing plate that faces the circuit board that requires cooling, it is easier to cool the circuit board that requires cooling with outside air.

[0037] According to any of the circuit board mounting devices from the 15th means to the 17th means described above, even when performing work on the structure, it is possible to prevent the article that falls due to the work from entering the gap between the circuit board and the mounting plate.

Brief Description of the Drawings

[0038]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0039] Hereinafter, the mode for carrying out this invention will be described.

[0040] Embodiment 1. In FIG. 1, a circuit board equipment device 1 according to Embodiment 1 of the present invention is shown. In this specification and the drawings, substantially the same components are denoted by common reference numerals. Also, in this specification, duplicate descriptions of the same components are omitted. Further, in the drawings, in order to ensure ease of understanding, illustrations other than those necessary for the description are almost omitted.

[0041] (1) Overall configuration of the circuit board equipment device The circuit board mounting device 1 is a device that at least includes a circuit board 3 described later, a mounting board 4 for mounting the circuit board 3, and a structure 5 that requires work. In Embodiment 1, an image forming apparatus 10 is exemplified as an example of the circuit board mounting device 1. The image forming apparatus 10 is a device that forms an image corresponding to image information input from an image reading device or externally on a sheet, which is an example of a recording medium.

[0042] As shown in FIG. 1, the image forming apparatus 10, which is an example of the circuit board mounting device 1, has a housing 11 having a predetermined shape. The housing 11 is a box-shaped structure formed in a predetermined external shape. The housing 11 is manufactured by variously combining, for example, a structural frame serving as a framework (not shown), auxiliary members (not shown), an exterior material 12, and the like. The auxiliary members are partition members, mounting members, etc. The exterior material 12 includes a front cover 12f, left and right side covers 12c, 12d, a rear cover 12r, and openable and closable covers 13a, 13b, 13c, etc. The housing 11 in Embodiment 1 is configured as a structure having an approximately rectangular parallelepiped external shape.

[0043] The image forming apparatus 10 is a device that forms an image corresponding to image information input from an image reading device or externally on a sheet, which is an example of a recording medium. The image information is information regarding an element to be formed as an image. The image information is information including at least one of elements such as characters, symbols, figures, tables, photographs, patterns, etc.

[0044] Also, as shown in FIG. 1(A), the image forming apparatus 10 includes an image forming unit 21, a medium supply unit 22, etc. disposed in the internal space of the housing 11. Also, the image forming apparatus 10 includes an image reading unit 23 disposed above the housing 11 and a discharge storage unit 24 provided in a portion of the housing 11 below the image reading unit 23.

[0045] The image forming unit 21 is a part that directly forms an image corresponding to image information on a sheet or the like by a predetermined image forming method, or transfers the image to a sheet or the like after forming the image. Examples of the image forming method include an electrophotographic method, an inkjet method, a thermal method, and the like. The medium supply unit 22 is a part that accommodates a recording medium such as a sheet on which an image is to be formed and conveys and supplies the recording medium to the image forming unit 21. In the medium supply unit 22, the front surface portion of the container that accommodates the recording medium also serves as a part of the front cover 12f of the housing 11. A medium conveyance path (not shown) is provided between the medium supply unit 22 and the image forming unit 21.

[0046] The image reading unit 23 is a part that reads an image of a document and transmits the read image information to the image forming unit 21. Some of the image reading units 23 have an automatic document conveyance unit that automatically conveys the document to be read to the image reading unit 23. The discharge and accommodation unit 24 is a part where a recording medium such as a sheet on which an image is formed is discharged and accommodated. A medium conveyance path (not shown) is provided between the image forming unit 21 and the discharge and accommodation unit 24.

[0047] When the control device 26 described later receives a command for an image forming operation, the image forming apparatus 10 performs the next image forming operation based on the control of the control device 26. First, in the image forming unit 21, an image corresponding to the input image information is formed. On the other hand, in the medium supply unit 22, a recording medium such as a sheet is supplied to the image forming unit 21 through the medium conveyance path. Thereby, the image is formed on the recording medium. Subsequently, the recording medium on which the image is formed is conveyed and accommodated so as to be discharged from the image forming unit 21 to the discharge and accommodation unit 24 through the medium conveyance path. Thereby, the image formation on one recording medium is completed.

[0048] Also, as shown in FIG. 1(B), FIG. 3, etc., the image forming apparatus 10 includes a power supply device 25, a control device 26, a rotation driving device 27, a blower device 28, circuit boards 3A, 3B, etc., which are arranged at the rear portion of the housing 11.

[0049] The image forming apparatus 10 shown in FIG. 1(B) and FIG. 3 is in a state as viewed from the rear when the rear cover 12r as an exterior member is removed. In the image forming apparatus 10, when the rear cover 12r is removed, as shown in FIG. 1(B) etc., the power supply device 25 etc. arranged in the rear part of the housing 11 are in an exposed state. Also, in the image forming apparatus 10, by removing the rear cover 12r, the rear surface 23r of the image reading unit 23 is also in an exposed state.

[0050] The power supply device 25 is a device that outputs the electricity taken in from the outside as electricity adjusted to the content during actual use such as necessary voltage, frequency, direct current, etc. The power supply device 25 is installed on the bottom frame 14 etc. which is one of the structural frames of the housing 11. The bottom frame 14 is formed in the form of columns, bars, plates, etc. The power supply device 25 in Embodiment 1 is arranged so as to exist below the control device 26 when viewed from the rear.

[0051] The control device 26 is a device that controls the overall operation and part of the operation of the image forming apparatus 10 while receiving information necessary for the control operation. The components constituting the control device 26 are, for example, an arithmetic processing unit, a memory element, a storage device, an input / output device, etc. The control device 26 in Embodiment 1 is arranged with the components constituting the device inside the housing 261 as shown by the broken line in FIG. 1(B).

[0052] The housing 261 is composed of a rear panel 261b, an upper panel 261c, a left side panel 261d, a front panel (not shown), a lower panel, a right side panel, etc. as shown in FIG. 1(B) etc. The rear panel 261b is a panel arranged at the rear when viewed in the front-rear direction of the housing 11. The left side panel 261d has a shape with an opening in the part through which the wiring cable passes. In the front-rear direction, the front is the side facing the front where the user of the image forming apparatus 10 confronts. In the front-rear direction, the rear is the side opposite to the front and is the back side.

[0053] Further, the housing 261 is attached by being screwed to the rear frame 15 which is one of the structural frames of the housing 11. The rear frame 15 is formed in the form of a pillar, a rod, a plate, or the like. Therefore, the control device 26 is attached to a part of the rear frame 15 via the housing 261.

[0054] The control device 26 in the first embodiment is arranged so as to be present on the upper side of the rear frame 15 when viewed from the rear. Further, the control device 26 is arranged by the housing 261 so as to be present diagonally above the circuit board 3B.

[0055] The rotation drive device 27 is a device that outputs the rotational power necessary for the drive unit in the image forming unit 21 and the like. The rotation drive device 27 is composed of components such as a motor and a gear box, for example. The rotation drive device 27 is arranged so as to be present inside the housing 11. Further, a part of the rotation drive device 27 is arranged in a state of being exposed from the inspection opening 16 formed between the rear frames 15.

[0056] The rotation drive device 27 in the first embodiment is arranged so as to be present in a portion on the upper part of the rear portion of the housing 11 opposite to the control device 26 when viewed from the rear. Further, the rotation drive device 27 is arranged so as to be present above the circuit board 3A.

[0057] The air blowing device 28 is a device that generates an air flow that takes in external air (outside air) into the housing 11 and discharges it outside the housing 11. The air blowing device 28 is composed of components such as an air blowing fan 281, a fan mounting frame 282, and a duct (not shown), for example. The air blowing device 28 is attached by screwing the air blowing fan 281 to a part of the rear frame 15 via the fan mounting frame 282.

[0058] In Embodiment 1, the blower device 28 is arranged such that when viewed from the rear, it is located between the control device 26 and the rotation drive device 27 at a portion of the upper part of the rear frame 15 on the side opposite to the control device 26. Further, the blower device 28 is arranged to be diagonally above the circuit boards 3A and 3B.

[0059] Furthermore, the image forming apparatus 10 also includes optional components and the like that are mounted on the rear part of the housing 11. Optional components are devices that are mounted by the user's selection. For this reason, in the image forming apparatus 10, there may be cases where no optional components exist if the user does not select them.

[0060] Examples of optional components include a FAX (facsimile) communication device 201, a USB (Universal Serial Bus) connection device 202, etc. The above-described image reading unit 23 may also be one of the optional components.

[0061] The FAX communication device 201 is a communication device for converting an image (including characters) of a document into an electrical signal and transmitting and receiving it via a communication line. The FAX communication device 201 is provided with an insertion port (not shown) for inserting connection terminals such as communication line and network cable connectors. When viewed from the rear, the FAX communication device 201 is arranged to be located on the side of the control device 26 and above the blower device 28. Further, the FAX communication device 201 is arranged to be diagonally above the circuit boards 3A and 3B.

[0062] The USB connection device 202 is a device that enables connection of USB devices. The USB connection device 202 is provided with a USB port (not shown) for inserting connectors of USB devices and USB cables. When viewed from the rear, the USB connection device 202 is arranged to be located on the side of the control device 26 and the FAX communication device 201 and above the rotation drive device 27. Further, the USB connection device 202 is arranged to be above the circuit board 3A.

[0063] As shown in FIGS. 2, 3, etc., both of the circuit boards 3A and 3B are formed by mounting circuit components 32A and 32B on substrates 31A and 31B respectively to form a predetermined circuit.

[0064] Both of the substrates 31A and 31B are plate-like members on which wiring and mounting portions for circuit components 32 are formed. Such substrates 31A and 31B are, for example, referred to as printed wiring boards. As shown in FIG. 2, the substrates 31A and 31B in the first embodiment have a mounting surface 31e on which circuit components 32A and 32B are mounted and a back surface 31f thereof. Further, the substrates 31A and 31B are not limited to single-sided mounting type substrates on which circuit components are mounted on one side, but may also be double-sided mounting type substrates on which circuit components are mounted on both sides. Furthermore, the substrates 31A and 31B may be multi-layered substrates.

[0065] The circuit components 32A and 32B are components used to constitute an electronic circuit or an electric circuit. The circuit components 32A and 32B are components referred to as so-called active elements, passive elements, auxiliary components, etc. Active elements include transistors, diodes, ICs (integrated circuits), etc. Passive elements include resistors, coils, capacitors, transformers, etc. Auxiliary components include relays, switches, connectors, wiring, etc.

[0066] The circuit board 3A in the first embodiment is configured as, for example, a power conversion circuit board. The circuit board 3A is arranged to be present on one side of the lower part of the rear frame 15 when viewed from the rear. Further, the circuit board 3A is arranged to be present below the image reading unit 23 and below the rotation drive device 27, the blower device 28, etc.

[0067] Further, the circuit board 3B in Embodiment 1 is configured as, for example, a power supply circuit board. When viewed from the rear, the circuit board 3B is arranged to be present on the opposite side of the circuit board 3A at the lower part of the rear frame 15. Further, the circuit board 3B is arranged to be present below the image reading unit 23 and below the control device 26, the blower device 28, etc.

[0068] As shown in FIGS. 2 and 3, the circuit board 3A is attached to the attachment board 4A. The arrow D in FIG. 2 indicates the depth direction from the circuit boards 3A, 3B, etc. toward the attachment boards 4A, 4B, etc., respectively. The depth direction D in Embodiment 1 is the same direction as the direction horizontally from the rear to the front in the front-rear direction.

[0069] The depth direction D used in this specification is not limited to the generally used depth direction from the front to the rear. For example, if the circuit board 3A and the attachment board 4A are arranged on the left side surface of the housing 11, the depth direction D from the circuit board 3A toward the attachment board 4A is the same direction as the direction from the left to the right of the housing 11.

[0070] The attachment board 4A is a plate-like member. As the attachment board 4A in Embodiment 1, for example, as shown in FIGS. 2 and 3, a sheet metal having an attachment surface 4At with a shape slightly wider than the substrate 31A of the circuit board 3A is used. The attachment board 4A is not limited to a surface where the entire surface of the board is blocked, and may have an opening in a part of the board surface.

[0071] As schematically shown in FIG. 2, the circuit board 3A has the substrate 31A attached to the attachment board 4A by fixing means such as screwing via a plurality of support members 35. The support member 35 also serves as a spacing holding member that keeps the distance E1 between the substrate 31A and the attachment board 4A at a predetermined dimension. The interval E1 is the distance between the back surface 31f of the substrate 31A and the mounting surface 4At of the mounting plate 4A. Also, the interval E1 is also the interval of a gap S1, which will be described later, between the substrate 31A of the circuit board 3A and the mounting plate 4A.

[0072] Also, as shown in FIG. 3, the mounting plate 4A is attached by screwing a plurality of fixing portions 42 provided to protrude at predetermined positions on the outer peripheral portion thereof to the rear frame 15 and the bottom frame 14 of the housing 11.

[0073] As shown in FIGS. 2 and 4, the circuit board 3B is attached to the mounting plate 4B.

[0074] The mounting plate 4B is a plate-shaped member. As the mounting plate 4B in the first embodiment, as shown in FIGS. 2 and 3, a sheet metal having a mounting surface 4Bt having a shape slightly wider than the substrate 31B of the circuit board 3B is used. Also, the mounting plate 4B is not limited to a surface in which the entire plate surface is blocked, like the case of the mounting plate 4A, and may have an opening in a part of the plate surface.

[0075] As schematically shown in FIG. 2, the circuit board 3B is attached in a state where the substrate 31B is fixed to the mounting plate 4B by fixing means such as screwing via a plurality of support members 35. At this time, the substrate 31B is kept at an interval E2 from the mounting plate 4B by the support member 35. The interval E2 is not limited to the same dimension as the interval E1, and may be a different dimension. Also, as shown in FIG. 3, the mounting plate 4B is attached by screwing a plurality of fixing portions 43 provided at predetermined positions on the outer peripheral portion thereof to the rear frame 15.

[0076] (2) The blocking member in the circuit board mounting device Also, in the image forming apparatus 10 which is an example of the circuit board mounting apparatus 1, as shown in FIG. 4, a blocking member 6 is provided. The blocking member 6 is an example of a member that blocks at least a part of the path of an article 9 that falls from above along with the operation of the structure 5 that requires work, towards the gaps S1 and S2 (see FIG. 2) between the circuit boards 3A and 3B and the mounting plates 4A and 4B.

[0077] Here, the article 9 is an object having a shape and size that can fall due to the operation of the structure 5 and enter the gaps S1 and S2. Such an article 9 is mainly a fixture such as a screw 91, and in addition, for example, small stationery such as stapler pins and clips (paper fasteners), and other small parts can be mentioned. Articles 9 such as stapler pins and clips are those left behind in part of the image reading unit 23 or those that have accidentally fallen before the operation and remain in part of the rear surface 23r.

[0078] Also, the above operation is an operation related to the attachment and detachment (removal and installation), maintenance (inspection), repair, etc. of devices and parts. These operations include operations related to devices and parts that are already installed, as well as operations related to devices and parts that are retrofitted like optional parts. Also, these operations include not only manual operations by human hands but also automatic operations using robots or the like.

[0079] Also, the above structure 5 is a structure 5 that is arranged above at least one of the circuit boards 3A and 3B when viewed in the vertical up-and-down positional relationship, as shown in FIG. 3 and the like, among the structures 5 that require work. In Embodiment 1, the image reading unit 23, the housing 261 of the control device 26, the rotation driving device 27, the blower device 28, the FAX communication device 201, the USB connection device 202, etc. correspond to the structure 5 that requires work. Also, in Embodiment 1, for the sake of convenience, as shown in FIG. 3 and the like, the image reading unit 23 may be treated as the structure 5A, the rotation driving device 27 as the structure 5B, the blower device 28 as the structure 5C, the housing 261 as the structure 5D, the FAX communication device 201 as the structure 5E, and the USB connection device 202 as the structure 5F, respectively.

[0080] The operations on the structure 5 specifically include operations such as removing and attaching the screws 91 at the screwing parts when performing operations involving detachment, such as those of the image reading unit 23, the housing 261, the rotary drive device 27, the air blower 28, etc., as well as operations related to maintenance and repair. In addition, when retrofitting the optional FAX communication device 201 and USB connection device 202 to the structure 5, operations related to the retrofitting may be performed. Examples of the operations in this case include, as shown in FIG. 3, screwing the FAX communication device 201 to the mounting member 17A such as a bracket with the screw 91. Also, examples of the operations in this case include screwing the USB connection device 202 to the mounting member 17B with the screw 91.

[0081] Furthermore, at least a part of the above-mentioned paths means that there are numerous paths for the falling article 9 to head towards the gaps S1 and S2, but it is also acceptable to limit it to the paths among those numerous paths where the article 9 is predicted to easily enter the gaps S1 and S2. In other words, it also means that among those numerous paths, paths where the article 9 is predicted to have a low possibility of entering the gaps S1 and S2, or paths where the path is already blocked by another member, may be excluded.

[0082] The arrows H1 and H2 shown by the two-dot chain lines in FIG. 4 etc. are specific examples of at least a part of the numerous paths. The paths indicated by the arrows H1 and H2 are both examples of paths heading towards the upper ends of the gaps S1 and S2. Also, the paths indicated by these arrows H1 and H2 are both paths when falling naturally under the influence of gravity.

[0083] FIG. 3 and FIG. 4 schematically show the rear surface of the housing 11 when the rear cover 12r is removed. In FIGS. 3 and 4, the gaps S1 and S2 are located behind (in the front-rear direction, it is the front) of the circuit boards 3A and 3B (the substrates 31A and 31B) and have substantially the same shape and size as the circuit boards 3A and 3B (the substrates 31A and 31B).

[0084] Further, the blocking member 6 is provided at least in part in the range from the structure 5 to the circuit boards 3A and 3B. The phrase "at least in part in the range from the structure 5 to the circuit boards 3A and 3B" does not necessarily mean the entire range, but may also mean a necessary part within that range. Furthermore, the shape and form of the blocking member 6 are not particularly restricted as long as it can prevent the falling article 9 from passing through.

[0085] In the first embodiment, as shown in FIG. 4 and the like, an upper blocking member 61, a left-side blocking member 62, and a right-side blocking member 63 are provided as the blocking member 6 around the circuit board 3A.

[0086] The upper blocking member 61, the left-side blocking member 62, and the right-side blocking member 63 are all composed of plate-like members. Also, the upper blocking member 61, the left-side blocking member 62, and the right-side blocking member 63 are all provided on the mounting plate 4A of the circuit board 3A.

[0087] As shown in FIG. 4, the upper blocking member 61 is provided in the remaining portion of the upper end of the mounting plate 4A excluding the portion where the fan mounting frame 282 of the blower device 28 exists. This is for the following reason. That is, a part of the gap S1 between a part of the upper end of the circuit board 3A and the mounting plate 4A corresponding to that part of the upper end is covered from above by a part of the fan mounting frame 282 of the blower device 28. Therefore, the upper blocking member 61 does not need to be provided at a part of the upper end of the mounting plate 4A corresponding to a part of the upper end of the circuit board 3A, and it suffices to be provided in the remaining portion excluding that part of the upper end of the mounting plate 4A.

[0088] Also, the upper blocking member 61 is provided in part in the range from the image reading unit 23 of the structure 5A, the USB connection device 202 of the structure 5F, and the rotation driving device 27 of the structure 5B to the circuit board 3A. Furthermore, as shown in FIG. 5, the upper blocking member 61 rises from the upper end (upper side) of the mounting plate 4A toward the circuit board 3A, and the raised tip thereof is provided in a state of crossing over the upper end (upper side) 31At of the substrate 31A of the circuit board 3A.

[0089] At this time, as shown in FIGS. 4 and 5, the upper blocking member 61 is provided in a state of being in contact with or approaching the upper end (upper side) of the substrate 31A. The state of approaching with respect to the blocking member 6 means a state in which there is a gap through which the article 9 cannot pass between the blocking member 6 and the member to which the blocking member 6 approaches (the same shall apply hereinafter).

[0090] The left side blocking member 62 is provided along substantially the entire vertical range of the left side end (left side portion) of the mounting plate 4A. Further, the left side blocking member 62 is provided in a state of being in contact with or contacting the lower surface of the left end of the upper blocking member 61. Furthermore, as shown by the two-dot chain line in FIG. 5, the left side blocking member 62 rises from the left end (left side) of the mounting plate 4A toward the circuit board 3A, and the raised tip thereof is provided in a state of crossing over the left end (left side) of the substrate 31A of the circuit board 3A. At this time, as shown in FIG. 4, the left side blocking member 62 is provided in a state of being in contact with or approaching the left end (left side) of the substrate 31A.

[0091] The right side blocking member 63 is provided along substantially the upper half of the vertical direction of the right side end (right side) of the mounting plate 4A. Further, the right side blocking member 63 is provided in a state of extending downward from the right end of the upper end (upper side) of the mounting plate 4A. Furthermore, as shown by the two-dot chain line in FIG. 5, the right side blocking member 63 rises from the right side end (right side) of the mounting plate 4A toward the circuit board 3A, and the raised tip thereof is provided in a state of crossing over the right side end (right side) of the substrate 31A of the circuit board 3A. At this time, as shown in FIG. 4, the right side blocking member 63 is provided in a state of being in contact with or approaching the right side end (right side) of the substrate 31A.

[0092] Next, in Embodiment 1, as shown in FIG. 4 and the like, an upper shielding member 64 is provided as a shielding member 6 around the circuit board 3B.

[0093] The upper shielding member 64 is composed of a plate-shaped member. Further, the upper shielding member 64 is provided on the mounting plate 4B of the circuit board 3B.

[0094] Also, the upper shielding member 64 is provided in a part of each range from the image reading unit 23 of the structure 5A and the housing 261 of the structure 5D to the circuit board 3B. Also, it can be said that the upper shielding member 64 is provided in a part of each range from the FAX communication device 201 of the structure 5E and the blower 28 of the structure 5C to the circuit board 3B. Also, the left end of the upper shielding member 64 is provided in a state of approaching the right side shielding member 63 provided on the circuit board 3A side.

[0095] Furthermore, as shown in FIG. 6, the upper shielding member 64 rises from the upper end (upper side) of the mounting plate 4B toward the circuit board 3B, and the tip of the raised portion is provided in a state of slightly exceeding the upper end (upper side) of the substrate 31B of the circuit board 3B. At this time, as shown in FIGS. 4 and 6, the upper shielding member 64 is provided in a state of being in contact with or approaching the upper end (upper side) 31Bt of the substrate 31B.

[0096] The reason for providing the upper shielding member 64 so that it only slightly exceeds the upper end of the substrate 31B is as follows. That is, in the circuit board 3B, as exemplified in FIGS. 6 and 8, it is necessary to secure a space for routing a plurality of wiring cables 56 connected to the circuit components 32B etc. of the circuit board 3B upward of the circuit board 3B to other connection destinations. For this reason, the upper shielding member 64 cannot be provided in a state of exceeding the upper end of the substrate 31B as much as, for example, the upper shielding member 61 provided on the upper end side of the circuit board 3A through which the wiring cable 56 does not pass.

[0097] Incidentally, the image reading unit 23, which is the structure 5A, is arranged such that its rear surface 23r is located behind the second virtual plane J2 as shown in FIGS. 5 and 6. The second virtual plane J2 is a plane that is virtually extended vertically upward from the upper ends 31At and 31Bt of the substrates 31A and 31B of the circuit boards 3A and 3B, respectively. Also, the state of being behind in this case means a state shifted to the inner side of the image forming apparatus 10 or the housing 11 from the second virtual plane J2. The state of being behind in the first embodiment means a state shifted to the front side from the second virtual plane J2 when viewed in the front-rear direction of the image forming apparatus 10 or the like.

[0098] Also, the rotational drive device 27, which is the structure 5B, is arranged in a state behind the second virtual plane J2, similarly to the case of the image reading unit 23. Furthermore, both the rear surface 23r of the image reading unit 23 and the rotational drive device 27 are arranged behind the circuit boards 3A and 3B as shown in FIG. 5 and the like.

[0099] Therefore, when the screw 91 as the article 9 handled in the operations of the rear surface 23r of the image reading unit 23 or the rotational drive device 27 drops, there is a high possibility that the screw 91 will move toward the gaps S1 and S2 between the circuit boards 3A and 3B and the mounting plates 4A and 4B.

[0100] Also, the blower device 28, which is the structure 5C, the FAX communication device 201, which is the structure 5E, and the USB connection device 202, which is the structure 5F, are arranged such that their rear portions are in front of the second virtual plane J2 as shown in FIG. 5. The state of being in front in this case means a state shifted to the outer side of the image forming apparatus 10 or the housing 11 from the second virtual plane J2. The state of being in front in the first embodiment means a state shifted to the rear side from the second virtual plane J2 when viewed in the front-rear direction of the image forming apparatus 10 or the like.

[0101] However, on the other hand, the FAX communication device 201 and the USB connection device 202 are arranged such that the first virtual plane J1 overlaps at least a part of the gap S1 as shown in FIG. 5. The first virtual plane J1 is a plane that is virtually extended vertically downward from the part of the structure 5 that requires work. Also, the part that requires work is the part of the structure 5 where the work is actually performed. The part that requires work is, for example, the part (screw hole, screw attachment part) where the screw 91 is attached.

[0102] Therefore, when the screw 91, which is an article 9 handled in the work of the FAX communication device 201 or the USB connection device 202, falls, there is a high possibility that the screw 91 will move toward the gap S1 between the circuit board 3A and the mounting plate 4A. Also, when the gap S2 is in almost the same positional relationship as the gap S1 in the front-rear direction, the falling screw 91 also has a high possibility of moving toward the gap S2 between the circuit board 3B and the mounting plate 4B.

[0103] In this regard, the image forming apparatus 10, which is an example of the circuit board mounting apparatus 1, is provided with upper blocking members 61 and 64 as blocking members 6 even when work related to the structure 5 is performed and articles 9 such as the screw 91 fall. Therefore, entry of such articles 9 into the gaps S1 and S2 between the circuit boards 3A, 3B and the mounting plates 4A, 4B is prevented. That is, as shown in FIGS. 5 and 6, the path of the article 9 that has fallen due to work related to the structure 5 and is heading toward the gaps S1 and S2 is blocked by the upper blocking members 61 and 64, respectively. Therefore, entry into the gaps S1 and S2 is prevented.

[0104] Specifically, for the article 9 that has fallen due to work related to the image reading unit 23, the housing 261, the rotation driving device 27, the blower device 28, the FAX communication device 201, and the USB connection device 202 and is moving upward above the gaps S1 and S2, the paths heading upward above the gaps S1 and S2 are blocked by the upper blocking members 61 and 64 disposed at positions above the gaps S1 and S2. Thereby, the article 9 that has fallen and is moving upward above the gaps S1 and S2 is prevented from entering the gaps S1 and S2 from above, respectively.

[0105] In the image forming apparatus 10, articles 9 that fall and advance toward the lateral sides on the left and right of the gap S1 are also blocked from advancing toward the lateral sides on the left and right of the gap S1 by a right lateral blocking member 63 and a left lateral blocking member 62 disposed at the lateral positions on the left and right of the gap S1. As a result, articles 9 that fall and advance toward the lateral sides on the left and right of the gap S1 are prevented from entering the gap S1 from the lateral sides on the left and right of the gap S1. Particularly in the image forming apparatus 10, an article 9 that falls and attempts to advance toward the left lateral side of the gap S2 has its path of advancement toward the left lateral side of the gap S2 blocked by the presence of a right lateral blocking member 63 provided on the side of the circuit board 3A that is substantially adjacent to the circuit board 3B. For this reason, the article 9 that falls and attempts to advance toward the left lateral side of the gap S2 is prevented from entering the gap S2 from the left lateral side of the gap S2.

[0106] Such an operational effect can be similarly obtained when the first virtual plane J1 in the FAX communication apparatus 201 and the USB connected device 202 is arranged to be located behind the gap S1. In this case, being present behind means being present in a state shifted toward the inner side of the image forming apparatus 10 or the housing 10 with respect to the first virtual plane J1. Being present behind in the first embodiment means being in a state shifted toward the front side with respect to the first virtual plane J1 when viewed in the front-rear direction of the image forming apparatus 10 or the like.

[0107] Furthermore, according to the image forming apparatus 10 which is an example of the circuit board mounting apparatus 1, since the blocking member 6 is provided, it is possible to omit the operation of checking whether or not the article 9 has entered the gaps S1 and S2 and stopped in the middle. Specifically, it is possible to omit the disassembly operation of removing the circuit boards 3A and 3B from the mounting plates 4A and 4B respectively and disassembling them, or the disassembly operation of removing the circuit boards 3A and 3B integrally with the mounting plates 4A and 4B and then removing them from the mounting plates 4A and 4B for disassembly.

[0108] Note that according to the image forming apparatus 10, due to the presence of the blocking member 6, in addition to the articles 9 that fall due to the operation of the structure 5, articles that unexpectedly fall from above during movement or operation may be prevented from entering the gaps S1 and S2 between the circuit boards 3A, 3B and the mounting plates 4A, 4B.

[0109] (3) Positional relationship between the circuit board and the structure and the form of the blocking member In the first embodiment, both of the circuit boards 3A and 3B are disposed below the image reading unit 23 which is the structure 5A. Moreover, as shown in FIG. 3, both of the circuit boards 3A and 3B are disposed in a positional relationship where the surfaces of the substrates 31A and 31B of the circuit boards 3A and 3B exist inside the maximum width W1 of the image reading unit 23.

[0110] The maximum width W1 of the image reading unit 23 which is the structure 5A is the distance (dimension) between both ends in the horizontal direction of the image reading unit 23. The horizontal direction with respect to the maximum width W1 in the first embodiment also corresponds to the left - right direction of the image forming apparatus 10 or the housing 11.

[0111] When the circuit boards 3A and 3B are disposed in the above - described positional relationship with the image reading unit 23 which is the structure 5A, it is desirable that the upper blocking member 64 be provided such that its width W64 is equal to or greater than the maximum width Wb of the circuit board 3B as shown in FIG. 4. On the other hand, for the upper blocking member 61 in the first embodiment, its width W61 is not provided to be equal to or greater than the maximum width Wa of the circuit board 3A. This is because, as described above, since the fan mounting frame 282 exists in a part of the gap S1 between the circuit board 3A and the mounting plate 4A, it is not necessary to provide the upper blocking member 61 in that part. The width W61 of the upper blocking member 61 and the width W64 of the upper blocking member 64 are, for example, the distance (dimension) between both ends in the horizontal direction corresponding to the maximum width W1 of the image reading unit 23 which is the structure 5A. Also, the maximum widths Wa and Wb of the circuit boards 3A and 3B are the distance (dimension) between both ends in the horizontal direction of the surfaces of the substrates 31A and 31B which are planes intersecting the depth direction D of the circuit boards 3A and 3B respectively.

[0112] However, the upper blocking member 61 in Embodiment 1 is not provided with a width W61 that is equal to or greater than the maximum width Wa of the circuit board 3A. This is for the following reason. That is, a part of the gap S1 in Embodiment 1 is in a state of being covered from above by a part of the fan mounting frame 282 of the blower device 28 as described above. For this reason, it is not necessary to provide the upper blocking member 61 at a portion corresponding to the part of the gap S1 above the circuit board 3A that is covered. As a result, the upper blocking member 61 has a width W61 that is narrower than the maximum width Wa of the circuit board 3A.

[0113] When the upper blocking member 64 is provided with a width W64 that is equal to or greater than the width corresponding to the maximum width Wb of the circuit board 3B, the entire upper end of the gap S2 can be covered or blocked by the upper blocking member 64 at a position above the gap S2. Thereby, in the image forming apparatus 10, for example, compared with the case where the upper blocking member 64 is provided with a width narrower than the maximum width Wb of the circuit board 3B, the path of the article 9 trying to enter from above the gap S2 is blocked without leakage by the upper blocking member 64, and the article 9 is accurately prevented from entering the gap S2 from above.

[0114] Further, when considering the positional relationship between the circuit board 3B and the housing 261, which is the structure 5D arranged closest to the upper side thereof, the circuit board 3B is arranged in the following positional relationship. That is, as shown in FIG. 4, the circuit board 3B is arranged in a positional relationship where a part of the surface of the substrate 31B of the circuit board 3B exists inside the maximum width W4 (see FIG. 3) of the housing 261. The maximum width W4 of the housing 261 is the maximum width in the horizontal direction of the rear plate 261b of the housing 261.

[0115] When the circuit board 3B is arranged in the above-described positional relationship with the housing 261, which is the structure 5D, it is desirable to provide the upper blocking member 64 with a width W64 that is the following width. That is, in this case, it is desirable to provide the upper blocking member 64 such that its width W64 is equal to or greater than the width We corresponding to a part of the surface of the substrate 31B of the circuit board 3B as shown in FIG. 4. The above-mentioned part is a part that exists inside the maximum width W4 (see FIG. 3) of the housing 261 on the surface of the substrate 31B of the circuit board 3B. Further, the width W64 of the upper blocking member 64 at this time is the width in a state where at least an overlapping state with the part corresponding to the width We of the above-mentioned part of the surface of the substrate 31B of the circuit board 3B is maintained.

[0116] The upper blocking member 64 in Embodiment 1 is provided such that its width W64 is wider than the width corresponding to a part of the surface of the substrate 31B of the circuit board 3B as shown in FIG. 4. Thereby, in the image forming apparatus 10, for example, compared with the case where the upper blocking member 64 is provided such that its width W64 is narrower than the width We where a part of the surface of the substrate 31B of the circuit board 3B is inside the maximum width W4 of the housing 261 which is the structure 5D, it is possible to prevent the falling article 9 from entering the gap S2. Specifically, it is possible to prevent the article 9 falling toward the part corresponding to the width We of the surface of the substrate 31B of the circuit board 3B in the gap S2 from entering from the part of the width We of the gap S2.

[0117] Furthermore, when considering the positional relationship between the circuit board 3A and the rotation drive device 27 which is the structure 5B arranged at the closest position above it, the circuit board 3A is arranged in the following positional relationship. That is, the circuit board 3A is arranged such that the surface of its substrate 31A overlaps with the maximum width W2 (see FIG. 3) of the rotation drive device 27 and exists with a width wider than the maximum width W2 as shown in FIG. 4. The maximum width W2 of the rotation drive device 27 can be, for example, the maximum width in the horizontal direction of its inspection opening 16.

[0118] When the circuit board 3A is arranged in the above-described positional relationship with the rotary drive device 27 that is the structure 5B, it is desirable that the upper blocking member 61 be provided such that its width W61 overlaps at least with the maximum width W2 of the structure 5B (see FIG. 3) as shown in FIG. 4 and has a width wider than the maximum width W2. In the first embodiment, the upper blocking member 61 is provided such that its width W61 overlaps with the maximum width W2 of the structure 5B as shown in FIG. 4 and has a width wider than the maximum width W2.

[0119] Thereby, in the image forming apparatus 10, for example, compared with the case where the upper blocking member 61 is provided with a width W61 narrower than the maximum width W2 of the structure 5B, it is easier to prevent the falling article 9 from entering the gap S1. Specifically, the path along which the article 9 falling due to work on the structure 5B advances so as to enter from above the gap S1 is accurately blocked by the upper blocking member 61, preventing it from entering the gap S1. In other words, when the upper blocking member 61 is provided with a width W61 narrower than the maximum width W2 of the structure 5B, there is a portion where the upper blocking member 61 does not exist above the gap S1, and there is a risk that the falling article 9 may enter the gap S1 through that portion.

[0120] Also, as shown in FIG. 7, both the upper blocking members 61 and 64 are provided with dimensions longer than the intervals (depth dimensions) E1 and E2 in the depth direction D of the gaps S1 and S2, respectively, in the depth direction D from the circuit boards 3A and 3B toward the mounting plates 4A and 4B. In the first embodiment, the length L1 of the upper blocking member 61 along the depth direction D is a dimension (L1 > E1) longer than the interval E1 of the gap S1. Also, in the first embodiment, the length L2 of the upper blocking member 64 along the depth direction D is a dimension (L2 > E2) longer than the interval E2 of the gap S2.

[0121] As a result, in the image forming apparatus 10, when the upper blocking members 61 and 64 are provided with dimensions shorter than the intervals E1 and E2 which are also the depths of the gaps S1 and S2, it becomes easier to prevent the article 9 falling from above from entering the gaps S1 and S2. In other words, when the upper blocking members 61 and 64 are provided with dimensions shorter than the intervals E1 and E2 of the gaps S1 and S2, there are portions where the upper blocking members 61 and 64 do not exist in a part of the depth direction D above the gaps S1 and S2. For this reason, in this case, there is a possibility that the falling article 9 passes through the portion where the upper blocking members 61 and 64 do not exist above the gaps S1 and S2 and enters the gaps S1 and S2. The portions where the upper blocking members 61 and 64 do not exist above the gaps S1 and S2 are mainly the portions where gaps of a size through which the falling article 9 can pass are formed.

[0122] Furthermore, as shown in FIG. 7, it can also be said that both of the upper blocking members 61 and 64 are provided in such a state that the gaps S1 and S2 are not visible by the upper blocking members 61 and 64 when viewed from vertically above. Strictly speaking, with respect to the upper blocking member 61, a part of the gap S1 is provided in a state where it is not visible. However, the remaining part of the gap S2 is in a state where it is not visible by the fan mounting frame 282 of the blower device 28. In FIG. 7, the reference sign W61 is the width along the horizontal direction and in a direction orthogonal to the depth direction D of the upper blocking member 61. Also, in FIG. 7, the reference sign W64 is the width along the horizontal direction and in a direction orthogonal to the depth direction D of the upper blocking member 64.

[0123] As a result, in the image forming apparatus 10, when compared with the case where the upper blocking members 61 and 64 are provided in a state where at least a part of the gaps S1 and S2 is visible when viewed from vertically above, it becomes easier to prevent the article 9 falling from above from entering the gaps S1 and S2. That is, when the upper blocking members 61 and 64 are provided in a state where at least a part of the gaps S1 and S2 can be seen, there are portions where the upper blocking members 61 and 64 do not exist in a part of the upper part of the gaps S1 and S2. Therefore, in this case, there is a possibility that the falling article 9 may enter the gaps S1 and S2 through the portions where the upper blocking members 61 and 64 do not exist above the gaps S1 and S2. The portions where the upper blocking members 61 and 64 do not exist above the gaps S1 and S2 at this time are also mainly targeted at the portions where gaps of the same width as in the case of the above-described portions are formed.

[0124] Further, as shown in FIG. 8 and the like, the upper blocking member 64 has an end portion 64c through which the wiring cable 56 approaches or contacts and passes. In this case, it is desirable that the upper blocking member 64 has its end portion 64c bent.

[0125] The bent shape is a shape such that the portion where the wiring cable 56 contacts is a rounded curved surface rather than a sharp corner. This bent shape can be obtained by bending or the like. Also, the bent shape is usually bent downward, but may be bent upward. Note that, instead of making the end portion 64c of the upper blocking member 64 bent, it may have an end face shape of a rounded curved surface.

[0126] When the end portion 64c of the upper blocking member 64 is bent in this way, compared with the case where the end portion 64c is not bent, the wiring cable 56 gently contacts the bent end portion 64c of the upper blocking member 64. Therefore, in this case, the possibility that the wiring cable 56 is damaged or cut by contacting the end portion 64c of the upper blocking member 64 is reduced.

[0127] In addition, in an image forming apparatus 10 which is an example of the circuit board mounting apparatus 1, for example, the circuit board 3A is a circuit board that requires cooling. Further, as shown in FIG. 9 and the like, the blower fan 281 of the blower device 28 is arranged so as to exist in a state of overlapping above a part of the upper end of the circuit board 3A.

[0128] In this case, it is desirable that the blocking member 6 is provided so as to exist at least in a portion of the upper end of the substrate 31A of the circuit board 3A that requires cooling, excluding the part where the blower fan 281 is overlapped and arranged. As shown in FIG. 9 and the like, the upper blocking member 61 in the first embodiment is provided so as to exist in a portion of the upper end of the substrate 31A of the circuit board 3A excluding the part where the blower fan 281 is overlapped and arranged. Further, in a portion of the fan mounting frame 282 of the blower device 28 that overlaps with the upper end of the substrate 31A of the circuit board 3A, a ventable opening (not shown) that communicates with at least the mounting surface 31e (see FIG. 2) side of the substrate 31A of the circuit board 3A is formed.

[0129] As a result, in the image forming apparatus 10, airflows K1, K2, etc. that flow through the circuit board 3A are generated by the intake force caused by the drive of the blower fan 281. As a result, in the image forming apparatus 10, the circuit board 3A that requires cooling is cooled by the airflow generated by the blower fan 281. In other words, if the blocking member 6 is not provided in the upper portion of the upper end of the circuit board 3A that requires cooling, excluding the part where the blower fan 281 is overlapped and arranged, the following problems may occur. That is, in this case, as illustrated by the arrow Kx in the two-dot chain line in FIG. 9, a part (Kx) of the airflow generated by the drive of the blower fan 281 does not flow toward the blower fan 281, but leaks from a part of the upper end of the circuit board 3A. For this reason, in this case, the circuit board 3A cannot be efficiently cooled by the airflow generated by the blower fan 281.

[0130] Incidentally, in the image forming apparatus 10, in addition to the upper blocking member 61 for the circuit board 3A that requires cooling, a left-side blocking member 62 and a right-side blocking member 63 are provided. Therefore, the airflow generated by the blower fan 281 easily flows through the space sandwiched between the left-side blocking member 62 and the right-side blocking member 63 as if it were an air passage. As a result, in the image forming apparatus 10, compared with the case where the left-side blocking member 62 and the right-side blocking member 63 are not provided, the circuit board 3A that requires cooling can be cooled more efficiently by the airflow generated by the blower fan 281.

[0131] Further, in the image forming apparatus 10 which is an example of the circuit board mounting apparatus 1, as shown in FIG. 1(B), it includes a rear cover 12r (see FIG. 1(B)) which is an example of an opposing plate arranged in a state facing the circuit board 3A that requires cooling.

[0132] In this case, it is desirable to provide ventilation holes in at least a part of the region of the rear cover 12r facing the circuit board 3A, through which external air (outside air) can be taken in. In the first embodiment, as illustrated in FIG. 9, ventilation holes 18 are provided in the lower region in the vertical direction of the rear cover 12r. The ventilation holes 18 may be through holes such as punched holes, or may be slit-shaped openings or those formed of a mesh-like porous material.

[0133] Thereby, in the image forming apparatus 10 provided with the ventilation holes 18, compared with the case where the ventilation holes 18 are not provided in at least a part of the region of the rear cover 12r (which is an example of an opposing plate) facing the circuit board 3A that requires cooling, due to the intake force generated by the drive of the blower fan 281, outside air which is the air outside the housing 11 is easily taken in from the ventilation holes 18 toward the circuit board 3A. As a result, in the image forming apparatus 10, it becomes possible to cool the circuit board 3A that requires cooling with outside air.

[0134] Second Embodiment. FIG. 10 shows the main part of the circuit board mounting apparatus 1B according to the second embodiment of the present invention.

[0135] The circuit board mounting device 1B has, as the circuit board 3, a front-side circuit board 3D disposed on the front side that is first exposed to the outside, and a back-side circuit board 3E disposed deeper than the front-side circuit board 3D and difficult to visually recognize from the outside. The front-side circuit board 3D is composed of a substrate 31D and circuit components 32D, similar to the case of the circuit board 3A etc. in the first embodiment. Similarly, the back-side circuit board 3E is also composed of a substrate 31E and circuit components 32E.

[0136] The circuit board mounting device 1B has, as the mounting plate 4, a front-side mounting plate 4D for mounting the front-side circuit board 3D and a back-side mounting plate 4E for mounting the back-side circuit board 3E. Furthermore, in the circuit board mounting device 1B, a structure 5 that requires work is disposed above the front-side circuit board 3D and the back-side circuit board 3E.

[0137] In the circuit board mounting device 1B, as shown in FIG. 10, an upper blocking member 6A on the front side is provided.

[0138] The upper blocking member 6A on the front side is a member that blocks at least a part of the path of an article 9 falling from above toward the upper end of the gap S4 between the front-side circuit board 3D and the front-side mounting plate 4D. Also, the upper blocking member 6A on the front side is provided at the upper end of the front-side mounting plate 4D facing the gap S4 between the front-side circuit board 3D and the back-side circuit board 3E. Furthermore, the upper blocking member 6A on the front side is provided in a state of rising from the front-side mounting plate 4D and crossing over to approach or contact the upper end of the substrate 31D of the front-side circuit board 3D.

[0139] In the circuit board mounting device 1B, as shown in FIG. 10, an intermediate blocking member 6M is additionally provided.

[0140] As shown in FIG. 10, the intermediate blocking member 6M is a member that blocks at least a part of the first path H10 on the back side leading to the upper end of the gap S10 between the front mounting plate 4D and the back circuit board 3E through which the article 9 falling from above passes. Also, the intermediate blocking member 6M is provided on the surface opposite to the surface on which the upper blocking member 6A on the front side of the front mounting plate 4D is provided. Furthermore, the intermediate blocking member 6M is provided in a state where it rises from the front mounting plate 4D and reaches a position close to or in contact with the upper end of the substrate 31E of the back circuit board 3E.

[0141] Thus, in the circuit board mounting device 1B, compared with the case where the intermediate blocking member 6M is not additionally provided as the blocking member 6, it is also possible to prevent the article 9 falling due to the operation of the structure 5 from entering the gap S10. Incidentally, the entry of the falling article 9 into the gap S4 is prevented by the upper blocking member 6A on the front side. Also, both the upper blocking member 6A on the front side and the intermediate blocking member 6M are disposed at least in part within the range from the structure 5 to the front circuit board 3D and the back circuit board 3E.

[0142] In the second embodiment, it is desirable to additionally provide an upper blocking member 6B on the back side, as shown by the two-dot chain line in FIG. 10, as the blocking member 6.

[0143] As shown in FIG. 10, the upper blocking member 6B on the back side is a member that blocks at least a part of the second path H20 leading to the gap S5 between the back circuit board 3E and the back mounting plate 4E through which the article 9 falling from above passes. Also, the upper blocking member 6B on the back side is provided at the upper end of the back mounting plate 4E. Furthermore, the upper blocking member 6B on the back side is provided in a state where it rises from the back mounting plate 4E and partially overlaps so as to be close to or in contact with the upper surface of the intermediate upper blocking member 6M. Note that the upper blocking member 6B on the back side is disposed at least in part within the range from the structure 5 to the front circuit board 3D and the back circuit board 3E.

[0144] As a result, in the circuit board mounting device 1B provided with the upper blocking member 6B on the back side, it is possible to prevent an article 9 that falls due to the operation of the structure 5 from entering the gap S5, as compared with the case where the upper blocking member 6B on the back side is not additionally provided as the blocking member 6.

[0145] Modification example. The present invention is not limited to the configuration examples illustrated in the first and second embodiments, and includes modifications such as necessary changes and combinations without departing from the gist of each invention described in the claims. For this reason, the present invention includes, for example, modification examples as described below.

[0146] The blocking member 6 is not limited to a rectangular shape such as a rectangle in planar shape like the upper blocking members 61, 64, etc. That is, the blocking member 6 may have various planar shapes as long as it can block the path H leading to each gap S of the falling article 9. Also, as long as the blocking member 6 can block the path H leading to each gap S of the falling article 9, for example, it may be in a form having an opening in part or a form made of a porous member.

[0147] Also, regarding the upper blocking members 61, 6A, as illustrated in FIG. 11, the upper surface portion 61s (6As) may be configured to include a downward slope that slopes downward as it passes through the circuit boards 3A, 3D from the mounting plates 4A, 4D and moves away. The upper surface portion 61s (6As) is not limited to the case where only the upper surface is formed as a downward slope. For example, the upper surface portion 61s (6As) may be configured such that the entire upper blocking members 61, 6A are provided in a state of sloping downward as described above, and the upper surface at that time becomes a downward slope.

[0148] When the upper blocking members 61, 6A having this upper surface portion 61s (6As) are used, as illustrated in FIG. 11, when the article 9 that has fallen due to the operation of the structure 5 reaches the upper blocking members 61, 6A, it falls due to the slope of the upper surface portion 61s (6As) formed of a downward slope.

[0149] Furthermore, the upper blocking members 61 and 6A may be configured to have an upper surface portion 61q (6Aq) with an upwardly inclined upward slope portion 65 at an end away from the mounting plates 4A and 4D, as illustrated in FIG. 12. Reference numeral 3F in FIG. 12 is a lower circuit board disposed below the circuit board 3A or the circuit board 3D. Circuit components 32F are mounted on this lower circuit board 3F on the substrate 31F. Also, the lower circuit board 3F is mounted with a gap S6 from the mounting plate 4F.

[0150] In Embodiments 1 and 2, it is also possible that the upper blocking members 61, 64, and 6A of the blocking member 6 are provided so as to exist within a lower half range Pd that does not include the intermediate position Pm between the structure 5 and the circuit board 3, as shown in FIG. 13(A).

[0151] Note that the upper blocking members 61, 64, and 6A of the blocking member 6 may be provided so as to exist within an upper half range Pu that includes the intermediate position Pm between the structure 5 and the circuit board 3, as shown in FIG. 13(B).

[0152] In addition, in Embodiment 1 and the like, the image forming apparatus 10 is shown as an example of the circuit board mounting apparatus 1, but the circuit board mounting apparatus 1 of the present invention is not limited to the image forming apparatus 10. That is, the circuit board mounting apparatus 1 of the present invention may be any apparatus that mounts at least the circuit board 3, the mounting plate 4, and the structure 5 as described above. As another example of the circuit board mounting apparatus 1, for example, home appliances and the like can be mentioned.

[0153] Also, the circuit board 3, the mounting plate 4, the structure 5, and the blocking member 6 are not limited in any way to the configurations such as the number, type, positional relationship, and shape exemplified in Embodiments 1 and 2. Also, although the blocking member 6 is exemplified as being provided on the mounting plate 4 of the circuit board 3 in Embodiment 1 and the like, it may be provided on other members such as a structural frame for mounting the circuit board 3, for example.

[0154] Furthermore, regarding the upper blocking members 61, 64, etc. of the blocking member 6, although the configuration in which the flat plate-like members exemplified in the first embodiment etc. are provided in a substantially horizontal state has been exemplified, it is not limited thereto. The upper blocking member 61 etc. may be provided, for example, in a state where the entire upper surface thereof is inclined to one side where it is desired to move the dropped article 9, so as to form an inclined surface. Further, the upper blocking member 61 etc. may be an upper blocking member in which a part of the upper surface thereof is formed as an inclined surface inclined downward, or an upper blocking member having a shape that refracts in a mountain shape.

[0155] (Appendix) (((1))) A circuit board, A mounting board for mounting the circuit board, A structure arranged above the circuit board that requires work, A blocking member provided in at least a part of the range from the structure to the circuit board, and blocking at least a part of the path of an article falling from above due to the work and heading toward the gap between the circuit board and the mounting board, A circuit board mounting device comprising the above. (((2))) The circuit board is arranged in a positional relationship such that a plane intersecting the depth direction from the circuit board toward the mounting board exists inside the maximum width in the horizontal direction of a portion of the structure intersecting the depth direction, The circuit board mounting device according to ((1)), wherein the blocking member is provided with a width equal to or greater than the width corresponding to the maximum width in the horizontal direction of the plane of the circuit board intersecting the depth direction. (((3))) The circuit board is arranged in a positional relationship such that a part of a plane intersecting the depth direction from the circuit board toward the mounting board exists inside the maximum width in the horizontal direction of a portion of the structure intersecting the depth direction, The circuit board mounting device according to ((1)), wherein the blocking member is provided with a width equal to or greater than the width corresponding to a part of the plane of the circuit board. (((4))) The circuit board is arranged in a positional relationship such that a plane intersecting the depth direction from the circuit board toward the mounting board overlaps with the maximum width in the horizontal direction of the portion of the structure intersecting the depth direction and has a width wider than the maximum width. The circuit board mounting device according to ((1)), wherein the blocking member is provided with a width equal to or greater than the maximum width of the structure. (((5))) The circuit board mounting device according to any one of ((1)) to ((4)), wherein the blocking member is provided within a lower half range that does not include an intermediate position between the structure and the circuit board. (((6))) The circuit board mounting device according to any one of ((1)) to ((5)), wherein the blocking member is provided with a dimension longer than the depth dimension of the gap in the depth direction horizontally from the circuit board toward the mounting board. (((7))) The circuit board mounting device according to any one of ((1)) to ((6)), wherein the blocking member is provided in a state where the gap is not visible through the blocking member when viewed from above in the vertical direction. (((8))) The circuit board mounting device according to any one of ((1)) to ((7)), wherein the blocking member has an upper surface portion formed of a downward inclined surface that inclines downward as it passes through the circuit board and separates from the mounting board. (((9))) The circuit board mounting device according to any one of ((1)) to ((8)), wherein the blocking member has an upper surface portion provided with an upward inclined surface portion at an end separated from the mounting board. (((10))) The circuit board mounting device according to any one of ((1)) to ((9)), wherein the blocking member has an end portion where a wiring cable approaches or contacts and passes through, and the end portion has a bent shape. (((11))) As the circuit board, it has a front - side circuit board arranged on the front - side that is first exposed to the outside, and a rear - side circuit board arranged on the rear - side of the front - side circuit board and difficult to visually recognize from the outside. As the mounting plate, there is a front mounting plate for mounting the front circuit board and a rear mounting plate for mounting the rear circuit board, As the blocking member, an intermediate blocking member is additionally provided at least in a part of the range from the structure to the front circuit board and the rear circuit board, which blocks at least a part of the first rearward path in which an article falling from above heads toward the gap between the front mounting plate and the rear circuit board. The circuit board mounting device according to any one of ((1)) to ((10)). (((12))) As the blocking member, an rear blocking member is additionally provided at least in a part of the range from the structure to the front circuit board and the rear circuit board, which blocks at least a part of the second rearward path in which an article falling from above heads toward the gap between the rear circuit board and the rear mounting plate. The circuit board mounting device according to ((11)). (((13))) The circuit board has a circuit board that requires cooling, A blower fan is provided so as to overlap a part of the upper end of the circuit board that requires cooling, The blocking member is provided so as to exist at least in a part excluding the part of the upper end of the circuit board that requires cooling. The circuit board mounting device according to any one of ((1)) to ((12)). (((14))) A facing plate is provided so as to face the circuit board that requires cooling, Ventilation holes are provided in at least a part of the region of the facing plate that faces the circuit board that requires cooling. The circuit board mounting device according to ((13)). (((15))) The structure is arranged such that a first virtual plane that is virtually extended vertically downward from the part that requires the operation overlaps at least a part of the gap or exists behind the gap. The circuit board mounting device according to any one of ((1)) to ((14)). (((16))) The structure is the circuit board-equipped device according to any one of ((1)) to ((15)), which is disposed behind the circuit board. (((17))) The structure is the circuit board-equipped device according to ((16)), which is disposed behind a second virtual plane that is virtually extended vertically upward from the upper end of the circuit board.

[0156] According to the circuit board-equipped device according to ((1)), it is possible to prevent an article that falls from above due to work from entering the gap between the circuit board and the mounting plate, as compared with the case where no blocking member is provided that blocks at least a part of the path of the article toward the gap. According to the circuit board-equipped device according to ((2)), it is possible to prevent a falling article from entering the gap between the circuit board and the mounting plate, as compared with the case where the blocking member is provided with a width narrower than the width corresponding to the maximum width of the circuit board. According to the circuit board-equipped device according to ((3)), it is possible to prevent a falling article from entering the gap between the circuit board and the mounting plate, as compared with the case where the blocking member is provided with a width narrower than the width where a part of the surface intersecting the depth direction of the circuit board exists inside the maximum width of the structure. According to the circuit board-equipped device according to ((4)), it becomes easier to prevent a falling article from entering the gap between the circuit board and the mounting plate, as compared with the case where the blocking member is provided with a width narrower than the maximum width of the structure. According to the circuit board-equipped device according to ((5)), it is possible to block the path of a falling article toward the gap between the circuit board and the mounting plate at an early stage when the article starts to fall, as compared with the case where the blocking member is provided within the lower half range that does not include the middle position. According to the circuit board-equipped device according to ((6)), it becomes easier to prevent an article falling from above from entering the gap between the circuit board and the mounting plate, as compared with the case where the blocking member is provided with a dimension shorter than the depth dimension of the gap. According to the circuit board mounting device according to ((7)), compared with the case where the blocking member is provided in a state where at least a part of the gap is visible when viewed from above in the vertical direction, it is easier to prevent an article falling from above from entering the gap between the circuit board and the mounting plate. According to the circuit board mounting device according to ((8)), compared with the case where the blocking member does not have an upper surface portion formed of a downward slope, there is no possibility that an article that has fallen on the blocking member will stay on the upper surface portion of the blocking member. According to the circuit board mounting device according to ((9)), when two or more circuit boards are arranged with a vertical shift below the blocking member, compared with the case where the blocking member does not have an upper surface portion provided with an upward slope portion, it is possible to suppress an article that has fallen on the blocking member from staying and falling again. According to the circuit board mounting device according to ((10)), compared with the case where the end portion of the blocking member where the wiring cable approaches or contacts and passes is not in a bent shape, the risk of the wiring cable being damaged by contacting the end portion of the blocking member is reduced. According to the circuit board mounting device according to ((11)), compared with the case where an intermediate blocking member is not additionally provided as the blocking member, it is also possible to prevent a falling article from entering the gap between the front mounting plate and the rear circuit board. According to the circuit board mounting device according to ((12)), compared with the case where a rear blocking member is not additionally provided as the blocking member, it is also possible to prevent a falling article from entering the gap between the rear circuit board and the rear mounting plate. According to the circuit board mounting device according to ((13)), compared with the case where the blocking member is not provided in the upper portion excluding a part where the blower fans are arranged in an overlapping manner among the upper ends of the circuit boards that require cooling, it becomes easier to cool the circuit boards that require cooling with the airflow generated by the blower fans. According to the circuit board mounting device according to ((14)), compared with the case where ventilation holes are not provided in at least a part of the region of the opposing plate that faces the circuit board that requires cooling, it becomes easier to cool the circuit board that requires cooling with outside air. Any circuit board equipment according to ((15)) to ((17)) can prevent an article from falling during work on a structure from entering the gap between the circuit board and the mounting plate.

Explanation of Signs

[0157] 1 … Circuit board equipment 3 … Circuit board 3D… Circuit board on the front side 3E… Circuit board on the back side 4 … Mounting plate 4D… Mounting plate on the front side 4E… Mounting plate on the back side 5 … Structure 6 … Blocking member 6M… Intermediate blocking member 6B… Upper blocking member on the back side 9 … Article 12r… Rear cover (an example of a facing plate) 56… Wiring cable 61s… Upper surface portion consisting of a downward slope 61q… Upper surface portion provided with an upward slope portion 64c… End portion (the end portion where the wiring cable approaches or passes through) 65… Upward slope portion D … Depth direction E … Spacing (an example of the depth dimension of the gap) H … Path H10… First path H20… Second path Pd… Range of the lower half Pm… Intermediate position Pu… Range of the upper half S … Gap (gap between the circuit board and the mounting plate) S10… Gap (gap between the circuit board on the front side and the circuit board on the back side) W … Maximum width W61… Width of the upper blocking member 61 W64… Width of the upper blocking member 64 We… Width corresponding to a part of the circuit board that exists inside the maximum width of the structure

Claims

1. A circuit board, a mounting plate for mounting the circuit board, a structure arranged above the circuit board and requiring work, a blocking member provided at least in part in the range from the structure to the circuit board, and blocking at least part of the path along which an article falling from above due to the work heads towards the gap between the circuit board and the mounting plate, A circuit board equipment device comprising the above.

2. The circuit board is arranged in a positional relationship such that the plane intersecting the depth direction from the circuit board towards the mounting plate exists inside the maximum horizontal width of the portion of the structure intersecting the depth direction, The circuit board equipment device according to claim 1, wherein the blocking member is provided with a width equal to or greater than the width corresponding to the maximum horizontal width of the plane of the circuit board intersecting the depth direction.

3. A part of the plane of the circuit board intersecting the depth direction from the circuit board towards the mounting plate is arranged in a positional relationship inside the maximum horizontal width of the portion of the structure intersecting the depth direction, The circuit board equipment device according to claim 1, wherein the blocking member is provided with a width equal to or greater than the width corresponding to the part of the plane of the circuit board.

4. The circuit board is arranged in a positional relationship such that the plane intersecting the depth direction from the circuit board towards the mounting plate overlaps with the maximum horizontal width of the portion of the structure intersecting the depth direction and exists with a width wider than the maximum width, The circuit board equipment device according to claim 1, wherein the blocking member is provided with a width equal to or greater than the maximum width of the structure.

5. The circuit board equipment device according to claim 1, wherein the blocking member is provided within the lower half range not including the intermediate position between the structure and the circuit board.

6. The circuit board equipment device according to claim 1, wherein the blocking member is provided with a dimension longer than the depth dimension of the gap in the depth direction horizontally from the mounting plate towards the circuit board.

7. The circuit board equipment device according to claim 1, wherein the blocking member is provided in a state where the gap is not visible through the blocking member when viewed from vertically above downwards.

8. The circuit board equipment device according to claim 1, wherein the blocking member has an upper surface portion formed by a downwardly inclined slope that slopes downwards as it passes through the circuit board and away from the mounting plate.

9. The circuit board mounting device according to claim 1, wherein the blocking member has an upper surface portion provided with an upwardly inclined rising slope portion at an end portion away from the mounting plate.

10. The circuit board mounting device according to claim 1, wherein the blocking member has an end portion through which the wiring cable approaches or contacts and passes, and the end portion has a bent shape.

11. As the circuit board, it has a front-side circuit board arranged on the front side that is first exposed to the outside, and a rear-side circuit board arranged deeper than the front-side circuit board and difficult to visually recognize from the outside. As the mounting plate, it has a front-side mounting plate for mounting the front-side circuit board and a rear-side mounting plate for mounting the rear-side circuit board. As the blocking member, an intermediate blocking member is additionally provided at least in a part of the range from the structure to the front-side circuit board and the rear-side circuit board, which blocks at least a part of the inner-side first path along which an article falling from above heads towards the gap between the front-side mounting plate and the rear-side circuit board. The circuit board mounting device according to claim 1.

12. As the blocking member, an inner-side blocking member is additionally provided at least in a part of the range from the structure to the front-side circuit board and the rear-side circuit board, which blocks at least a part of the inner-side second path along which an article falling from above heads towards the gap between the rear-side circuit board and the rear-side mounting plate. The circuit board mounting device according to claim 11.

13. As the circuit board, it has a circuit board that requires cooling. It is provided with a blower fan arranged in a state of overlapping above a part of the upper end of the circuit board that requires cooling. The blocking member is provided so as to exist at least in a part excluding the above-mentioned part of the upper end of the circuit board that requires cooling. The circuit board mounting device according to claim 1.

14. It is provided with an opposing plate arranged in a state of facing the circuit board that requires cooling. The circuit board mounting device according to claim 13, wherein ventilation holes are provided in at least a part of the region of the opposing plate that faces the circuit board that requires cooling.

15. The structure is arranged such that a first virtual plane that extends vertically downward from the part that requires the operation overlaps at least a part of the gap or exists behind the gap. The circuit board mounting device according to any one of claims 1 to 14.

16. The structure is arranged behind the circuit board. The circuit board mounting device according to any one of claims 1 to 14.

17. The circuit board mounting device according to claim 16, wherein the structure is disposed behind a second virtual plane that is virtually extended vertically upward from the upper end of the circuit board.

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