Image forming device

Abstract

The present invention easily replaces a DC / DC converter.　This image forming device includes a main motor 160, a second sheet metal 130, an AC / DC converter 141, a main substrate 110, and a sub-substrate 120. The second sheet metal 130 supports the main motor 160. The sub-substrate 120 has a DC / DC converter 121 that converts a first voltage into a second voltage. The sub-substrate 120 is electrically connected to the main substrate 110 and is detachably supported by the second sheet metal 130. The main substrate 110, the sub-substrate 120, and the main motor 160 are positioned in a first region RE1. A main body housing 10 has a first end 1E close to the first region RE1 in a first direction and a second end 2E separated from the first region RE1 more than the first end 1E in the first direction. A distance D1 between the sub-substrate and the first end 1E is shorter than a distance D2 between the main substrate 110 and the first end 1E, and shorter than a distance D3 between the second sheet metal 130 and the first end 1E.

Description

Image forming device

[0001] The present invention relates to an image forming apparatus having a detachable substrate.

[0002] 2. Description of the Related Art Conventionally, an image forming apparatus having a detachable circuit board is known (see Japanese Patent Application Laid-Open No. 2003-122299). A DC / DC converter for converting a DC voltage is disposed on this circuit board.

[0003] Japanese Patent Application Laid-Open No. 2003-241924

[0004] In conventional image forming devices, the main board has a DC / DC converter, so when replacing the DC / DC converter, the main board must be replaced, which poses the problem of time and effort required for replacing the DC / DC converter.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an image forming apparatus in which the DC / DC converter can be easily replaced.

[0006] In order to solve the above-mentioned problems, the image forming apparatus according to the present invention includes a main body housing, a photosensitive drum, a main motor, a metal plate, an AC / DC converter, a main circuit board, and a sub-circuit board. The photosensitive drum is rotatable about a rotation axis extending in a first direction. The main motor applies driving force to the photosensitive drum. The metal plate supports the main motor. The AC / DC converter converts AC voltage supplied from a commercial power source into DC voltage of a first voltage. The main circuit board has an ASIC that controls the main motor. The main circuit board has a board mounting surface facing the first direction. The sub-circuit board has a DC / DC converter that converts DC voltage of the first voltage into DC voltage of a second voltage lower than the first voltage. The sub-circuit board is electrically connected to the main circuit board. The sub-circuit board is detachably supported by the metal plate. The main circuit board, the sub-circuit board, and the main motor are located in a first region that is on one side of the photosensitive drum in the first direction and is outside the photosensitive drum in the first direction. The main body housing has a first end closer to the first region in the first direction and a second end farther from the first region in the first direction than the first end, and the distance between the sub-board and the first end is smaller than the distance between the main board and the first end and is also smaller than the distance between the metal plate and the first end.

[0007] Since the sub-board on which the DC / DC converter is mounted is located outside the main board and the metal plate, the DC / DC converter can be easily replaced.

[0008] The sub-board may also have a first connector that is directly connected to the main board without a harness.

[0009] The sub-board is directly connected to the main board without a harness, which reduces the number of harnesses required.

[0010] The sub-board may be configured so that at least a portion thereof faces the main board in the first direction, and the first connector may be connected to the main board in the first direction.

[0011] The first connector may be disposed at one end of the sub-board in the vertical direction and in a second direction perpendicular to the first direction, and the other end of the sub-board in the second direction may be engaged with a metal plate.

[0012] The sub-board has one end connected to the main board via a connector and the other end secured to the metal plate, making it easier to replace the sub-board than when both ends in the second direction are secured to the metal plate.

[0013] The DC / DC converter may also be disposed on the surface of the sub-board facing the second end.

[0014] The DC / DC converter is disposed on the surface of the sub-board facing the second end, which prevents the user from touching the DC / DC converter when replacing the sub-board.

[0015] The metal plate may be positioned between the main board and the sub-board in the first direction.

[0016] The main board and the metal plate may be configured to be located at different positions in the vertical direction and in a second direction perpendicular to the first direction.

[0017] By positioning the main board and the metal plate at different positions in the second direction, the metal plate does not get in the way and the first connector can be easily attached to the main board.

[0018] The DC / DC converter may be configured to overlap the metal plate when viewed from the first direction.

[0019] Since the DC / DC converter overlaps the metal plate when viewed from the first direction, the metal plate can serve as an enclosure for the DC / DC converter.

[0020] The sub-board may further include a main motor drive circuit that outputs drive power to the main motor. The main motor drive circuit may overlap the metal plate when viewed from the first direction.

[0021] Since the main motor drive circuit overlaps the metal plate when viewed from the first direction, the metal plate can serve as an enclosure for the main motor drive circuit.

[0022] The metal plate may have a protrusion that protrudes toward the sub-board, and the sub-board may be fixed to the protrusion with a screw.

[0023] Since the metal plate has a convex portion that protrudes toward the sub-board, the convex portion acts as a spacer that ensures a distance between the sub-board and parts of the metal plate other than the convex portion 131, thereby preventing the DC / DC converter from coming into contact with the metal plate.

[0024] The sub-board may also have a second connector to which a terminal of a first harness that connects the main motor is connected, and the main motor may at least partially overlap the sub-board when viewed from the first direction.

[0025] Since the main motor overlaps at least a portion of the sub-board when viewed from the first direction, the first harness connecting the sub-board and the main motor can be shortened.

[0026] The sub-board may also include a low-voltage power supply board having an AC / DC converter and arranged in a second area that is on the other side of the photosensitive drum in the first direction, opposite to the one side of the photosensitive drum in the first direction, and that is outside the photosensitive drum in the first direction.The sub-board may also have a third connector to which a terminal of a second harness that connects the low-voltage power supply board is connected.

[0027] By locating the low-voltage power supply board in the second area, the main board and the sub-board can be prevented from being affected by electromagnetic waves emitted by the low-voltage power supply board. Furthermore, since the sub-board has a third connector to which a terminal of the second harness that connects the low-voltage power supply board is connected, the DC / DC converter of the sub-board can receive the first voltage without passing through the main board.

[0028] In addition, in a second direction perpendicular to the up-down direction and the first direction, the connection portion between the second harness and the low-voltage power supply board may be located closer to the sub-board than to the main board.

[0029] In the second direction, the connection portion between the second harness and the low-voltage power supply board is located closer to the sub-board than to the main board, so that the second harness can be made shorter.

[0030] The sheet conveying device may further include a pickup roller that receives driving force from the main motor to feed sheets stored in the sheet tray toward the photosensitive drum, and a gear train that transmits driving force from the main motor to the pickup roller, the gear train being located in the first region.The main board, sub-board, main motor, and pickup roller may be arranged in this order in the vertical direction and in a second direction perpendicular to the first direction.

[0031] The DC / DC converter may be configured to face the main board.

[0032] Since the DC / DC converter faces the main board, the main board can act as an enclosure for the DC / DC converter.

[0033] The sub-board may further include a main motor drive circuit that outputs drive power to the main motor. The main motor drive circuit may overlap the main board when viewed from the first direction.

[0034] The main motor driving circuit overlaps the main board when viewed from the first direction, so that the main board can serve as an enclosure for the main motor driving circuit.

[0035] In addition, the metal plate may be disposed between the main motor and the sub-board in the first direction.

[0036] In the first direction, the metal plate is disposed between the main motor and the sub-board, which prevents the user from touching the main motor when replacing the sub-board.

[0037] According to the present invention, it is possible to provide an image forming apparatus in which the DC / DC converter can be easily replaced.

[0038] 1 is a cross-sectional view of an image forming apparatus according to a first embodiment; FIG. 2 is a perspective view showing a main board, a sub-board, a low-voltage power supply board, a high-voltage power supply board, and a main motor; FIG. 3 is a block diagram showing electrical connections and control signals for the main board, the sub-board, the low-voltage power supply board, the high-voltage power supply board, and the main motor; FIG. 4 is a top view of the image forming apparatus according to the first embodiment, showing the positional relationship between the main board, the sub-board, the metal plate, the low-voltage power supply board, and the main motor; FIG. 5 is a view showing a state in which the sub-board has been removed from the state shown in FIG. 4; FIG. 6 is a view of the image forming apparatus according to the first embodiment, seen from a first direction, showing the positional relationship between the main board, the sub-board, the metal plate, and the main motor; FIG. 7 is a top view of an image forming apparatus according to a second embodiment, showing the positional relationship between the main board, the sub-board, the metal plate, the low-voltage power supply board, and the main motor; FIG. 8 is a top view of an image forming apparatus according to a third embodiment, showing the positional relationship between the main board, the sub-board, the metal plate, the low-voltage power supply board, and the main motor; FIG. 9 is a perspective view of a main board, the sub-board, the low-voltage power supply board, the high-voltage power supply board, and the main motor according to a fourth embodiment; FIG. 10 is a block diagram showing electrical connections and control signals for a main board, a sub-board, a low-voltage power supply board, a high-voltage power supply board, a main motor, etc. according to a fourth embodiment.

[0039] A first embodiment of the present disclosure will be described in detail with appropriate reference to the drawings. As shown in FIG. 1, an image forming apparatus 1 is a monochrome printer. In the following description, the front side (right side in FIG. 1) as viewed from a user using the image forming apparatus 1 will be referred to as the "front" and the rear side (left side in FIG. 1) as the "rear." The up-down direction is the vertical direction. The front-to-rear direction is perpendicular to the up-down direction. Furthermore, the left side (front side of the paper in FIG. 1) as viewed from the user will be referred to as the "left," and the right side (rear side of the paper in FIG. 1) will be referred to as the "left."

[0040] The image forming apparatus 1 includes a main body housing 10 , a front cover 20 , a sheet supply unit 30 , an image forming unit 40 , discharge rollers 81 , and an operation panel 180 .

[0041] The main body housing 10 is a housing that houses the sheet supply unit 30, the image forming unit 40, etc. The front cover 20 opens and closes a front opening 11 of the main body housing 10. The front opening 11 is formed in the front surface of the main body housing 10.

[0042] The operation panel 180 is disposed on the top surface 10A of the main body housing 10. The operation panel 180 can display various messages and can also be used to input commands to the image forming apparatus 1. The operation panel 180 is disposed on the front side of the main body housing 10.

[0043] The sheet supply unit 30 supplies sheets S to the image forming unit 40. The sheet supply unit 30 is located at the bottom inside the main body housing 10. The sheet supply unit 30 includes a sheet tray 31 and a sheet supply mechanism 32. The sheet tray 31 stores sheets S to be supplied to the image forming unit 40. The sheet tray 31 is detachable from the main body housing 10. The sheet tray 31 can be removed by pulling it forward from the main body housing 10. When attached to the main body housing 10, the sheet tray 31 is located below the image forming unit 40.

[0044] The sheet supply mechanism 32 includes a pickup roller 33, a separation roller 34, a separation pad 35, a first roller 36, and a registration roller 37. The pickup roller 33 feeds the sheets S stored in the sheet tray 31 toward the photosensitive drum 61. The separation roller 34 and the separation pad 35 separate the sheets S fed by the pickup roller 33 into single sheets. The first roller 36 and the registration roller 37 transport the sheets S toward the image forming unit 40.

[0045] The image forming section 40 forms an image on the sheet S. The image forming section 40 includes an exposure unit 50, a process unit 60, and a fixing unit 70.

[0046] The exposure unit 50 is located at the top of the main body housing 10. The exposure unit 50 has an optical device 51, a polygon mirror 52, and a polygon motor 53. The optical device 51 emits laser light. The polygon mirror 52 deflects the laser light emitted from the optical device 51. The polygon motor 53 rotates the polygon mirror 52. As shown by the imaginary lines, the exposure unit 50 emits a light beam from the optical device 51, which is deflected by the polygon mirror 52 and then exposes the surface of a photosensitive drum 61 of the image forming unit 40.

[0047] The process unit 60 is located between the exposure unit 50 and the sheet tray 31 inside the main body casing 10. The process unit 60 includes a drum unit 60A and a developing unit 60B that is detachable from the drum unit 60A.

[0048] The process unit 60 is detachable from the main body housing 10 through the front opening 11 when the front cover 20 is open. To remove the process unit 60, the process unit 60 is pulled forward from the main body housing 10 with the front cover 20 open. The development unit 60B is detachable from the drum unit 60A when the process unit 60 is removed from the main body housing 10. The drum unit 60A has a photosensitive drum 61, a charger 62, and a transfer roller 63.

[0049] The photosensitive drum 61 is rotatable about a rotation axis 61X extending in a first direction. A toner image is formed on the surface of the photosensitive drum 61. The charger 62 uniformly and positively charges the photosensitive drum 61. The transfer roller 63 transfers the toner image onto the sheet S together with the photosensitive drum 61.

[0050] In the following description, the direction in which the rotation axis 61X of the photosensitive drum 61 extends is referred to as the "first direction." Furthermore, the direction perpendicular to the up-down direction and the first direction is referred to as the "second direction." Furthermore, the arrow directions in the drawings point to one side of each direction. Furthermore, the direction opposite to one side is referred to as the other side. In this embodiment, the first direction is the left-right direction, with one side of the first direction referring to the left side and the other side of the second direction referring to the right side. The second direction is the front-rear direction. In this embodiment, one side of the second direction is the rear side and the other side of the second direction is the front side.

[0051] The developing unit 60B has a developing roller 64, a supply roller 65, a layer thickness regulating blade 66, an agitator 67, and a toner storage section 68. The toner storage section 68 stores toner. The agitator 67 agitates the toner in the toner storage section 68. The agitator 67 also supplies toner to the supply roller 65. The supply roller 65 supplies toner to the developing roller 64. The layer thickness regulating blade 66 contacts the surface of the developing roller 64 and regulates the thickness of the toner on the developing roller 64 to a constant thickness.

[0052] The fixing unit 70 is located behind the process unit 60 inside the main body housing 10. The fixing unit 70 includes a heating unit 71 and a pressure roller 72. The heating unit 71 heats the sheet S. The pressure roller 72 is pressed against the heating unit 71.

[0053] In the image forming section 40, the exposure unit 50 emits a light beam onto the surface of the charged photosensitive drum 61. As a result, an electrostatic latent image based on image data is formed on the photosensitive drum 61. The development roller 64 supplies toner to the surface of the exposed photosensitive drum 61. As a result, a toner image is formed on the photosensitive drum 61.

[0054] The photosensitive drum 61 and the transfer roller 63 transport the sheet S supplied from the sheet supply unit 30. As a result, the toner image formed on the photosensitive drum 61 is transferred onto the sheet S. The heating unit 71 and the pressure roller 72 transport the sheet S onto which the toner image has been transferred. As a result, the toner image transferred onto the sheet S is fixed onto the sheet S.

[0055] The discharge rollers 81 are located above the fixing unit 70. The discharge rollers 81 discharge the sheet S, on which an image has been formed by the image forming section 40, onto the discharge tray 13. The discharge tray 13 is formed on the top surface 10A of the main body housing 10.

[0056] As shown in FIG. 2, the image forming apparatus 1 includes a main board 110 , a sub-board 120 , a low-voltage power supply board 140 , a high-voltage power supply board 150 , and a main motor 160 .

[0057] The main board 110 and the sub-board 120 are connected directly without a harness. The sub-board 120 and the main motor 160 are connected by a first harness H1. The sub-board 120 and the low-voltage power supply board 140 are connected by a second harness H2. The sub-board 120 and the high-voltage power supply board 150 are connected by a third harness H3. The sub-board 120 and the operation panel 180 are connected by a fourth harness H4. The sub-board 120 and the circuit board 50A of the optical device 51 are connected by a fifth harness H5. The sub-board 120 and the polygon motor 53 are connected by a sixth harness H6.

[0058] The type of harness is arbitrary, and the harness may be an FFC (flexible flat cable).

[0059] As shown in FIG. 3, the main board 110 has an ASIC 111, a sub-converter 112, a ROM 114, a RAM 115, a non-volatile memory 116, a USB connector 118, a LAN connector 119, and a main connector CM.

[0060] The ROM 114 stores a control program, setting data, and the like for controlling the image forming apparatus 1. The RAM 115 and the non-volatile memory 116 are used as a working area from which the control program is read and as a storage area for temporarily storing image data included in a print job.

[0061] The ASIC 111 is a semiconductor integrated circuit for executing print control of the image forming apparatus 1. The ASIC 111 is a control device that executes print control by performing arithmetic processing based on control programs and data stored in the ROM 114, the RAM 115, and the non-volatile memory 116. In this embodiment, the ASIC 111 controls the operation panel 180, the exposure unit 50, and the main motor 160.

[0062] The sub-converter 112 converts the second DC voltage into a third DC voltage that is lower than the second voltage. The second voltage is, for example, 5 V or 3.3 V. The third voltage is, for example, 1.1 V.

[0063] The USB connector 118 and the LAN connector 119 are disposed at one end of the main board 110 in the second direction. The USB connector 118 and the LAN connector 119 are exposed to the outside of the main body housing 10 from one side (rear side) of the main body housing 10 in the second direction.

[0064] The USB connector 118 is a connector to which a USB terminal of an external device such as a PC is connected. When the USB connector 118 is connected to the USB terminal of the external device, the ASIC 111 can send and receive data to and from the external device.

[0065] A LAN cable is connected to the LAN connector 119. When the LAN cable is connected to the LAN connector 119, the ASIC 111 can transmit and receive data to and from external devices.

[0066] The main connector CM is a connector that is connected to the sub-board 120. The main connector CM is connected to the sub-board 120.

[0067] The sub-board 120 is a board electrically connected to the main board 110. The sub-board 120 does not have a control device or main control circuit such as an ASIC or a CPU. The sub-board 120 has a DC / DC converter 121, a main motor drive circuit 122, a polygon motor drive circuit 123, a first connector C1, a second connector C2, a third connector C3, a fourth connector C4, a fifth connector C5, a sixth connector C6, and a seventh connector C7. Note that because FIG. 3 is a block diagram showing the electrical connections of each board, the positions of the connectors differ in some respects from FIGS. 2 and 4.

[0068] The DC / DC converter 121 converts a first voltage into a second voltage, which is lower than the first voltage. The first voltage is, for example, 24 V. The second voltage is, for example, 5 V or 3.3 V.

[0069] The main motor drive circuit 122 is a circuit that drives and controls the main motor 160. Specifically, the main motor drive circuit 122 is supplied with a first DC voltage from the low-voltage power supply board 140. The main motor drive circuit 122 outputs drive power to the main motor 160 based on a control signal sent from the ASIC 111.

[0070] The polygon motor drive circuit 123 is a circuit that drives and controls the polygon motor 53. Specifically, the polygon motor drive circuit 123 is supplied with a first DC voltage from the low-voltage power supply board 140. The polygon motor drive circuit 123 outputs drive power to the polygon motor 53 based on a control signal sent from the ASIC 111.

[0071] The first connector C1 is a connector for connecting the sub-board 120 to the main board 110. The first connector C1 and the main connector CM are board-to-board connectors for connecting the boards together. At least one of the first connector C1 and the main connector CM may be a floating connector designed to absorb positional errors by moving relative to the main board 110 and the connector board 120.

[0072] The second connector C2 is a connector for connecting the main motor 160 to the sub-board 120. A terminal of the first harness H1 is connected to the second connector C2.

[0073] The third connector C3 is a connector for connecting the low-voltage power supply board 140 to the sub-board 120. A terminal of the second harness H2 is connected to the third connector C3.

[0074] The fourth connector C4 is a connector for connecting the high-voltage power supply board 150 to the sub-board 120. A terminal of the third harness H3 is connected to the fourth connector C4.

[0075] The fifth connector C5 is a connector for connecting the operation panel 180 to the sub-board 120. A terminal of the fourth harness H4 is connected to the fifth connector C5.

[0076] The sixth connector C6 is a connector for connecting the circuit board 50A of the optical device 51 to the sub-board 120. A terminal of the fifth harness H5 is connected to the sixth connector C6.

[0077] The seventh connector C7 is a connector for connecting the polygon motor 53 to the sub-board 120. A terminal of the sixth harness H6 is connected to the seventh connector C7.

[0078] The low-voltage power supply board 140 has an AC / DC converter 141. The AC / DC converter 141 is a converter that converts AC voltage supplied from a commercial power source into DC voltage of the first voltage. The low-voltage power supply board 140 is covered by a box-shaped metal enclosure (not shown). The low-voltage power supply board 140 is housed in the main body housing 10 in a detachable manner.

[0079] The high-voltage power supply board 150 is detachably housed in the main body housing 10. The high-voltage power supply board 150 has a circuit that generates a high voltage by boosting the first voltage supplied from the low-voltage power supply board 140. The high-voltage power supply board 150 has a charging voltage application circuit 151, a developing voltage application circuit 152, and a transfer voltage application circuit 153.

[0080] The charging voltage application circuit 151 is a circuit that applies a positive charging voltage to the charger 62. The charging voltage is, for example, 5 kV to 8 kV. The developing voltage application circuit 152 is a circuit that applies a positive developing voltage to the developing roller 64. The developing voltage is, for example, 300 V to 500 V. The transfer voltage application circuit 153 is a circuit that applies a transfer voltage to the transfer roller 63. The transfer voltage application circuit 153 controls the transfer voltage so that the current flowing through the transfer roller 63 becomes a predetermined current value. The transfer voltage is, for example, about minus several thousand volts.

[0081] The main motor 160 applies a driving force to the pickup roller 33, the separation roller 34, the first roller 36, the registration roller 37, the photosensitive drum 61, the developing roller 64, the supply roller 65, the agitator 67, the pressure roller 72, and the discharge roller 81. The pickup roller 33, the separation roller 34, the first roller 36, the registration roller 37, the photosensitive drum 61, the pressure roller 72, and the discharge roller 81 receive the driving force from the main motor 160 and transport the sheet S.

[0082] Operation panel 180 has operation panel ASIC 181 and LCD 182. Operation panel ASIC 181 is a semiconductor integrated circuit for executing operations on operation panel 180. LCD 182 is a display into which commands can be input. Various messages are displayed on LCD 182 in accordance with the instructions of operation panel ASIC 181.

[0083] As shown in Fig. 4, the main board 110 is fixed to the main body housing 10. The main board 110 is fixed to a first metal plate 10F with screws N (see also Fig. 6). The main board 110 is detachable from the main body housing 10. The first metal plate 10F is fixed to the main body housing 10. The first metal plate 10F is a metal plate and extends in a direction perpendicular to the first direction.

[0084] The main board 110 has a board mounting surface facing the first direction. That is, the ASIC 111 is disposed on the board mounting surface facing the first direction. In this embodiment, the main board 110 has a board mounting surface facing one side of the first direction, i.e., the left. The main connector CM faces one side of the first direction, i.e., the left. The main connector CM is connected to the first connector C1 of the sub-board 120.

[0085] The sub-board 120 is detachably fixed to the main housing 10. At least a portion of the sub-board 120 faces the main board 110 in the first direction. The main board 110 is directly connected to the first connector C1 without a harness. In this embodiment, the first connector C1 faces the main connector CM in the first direction, and they face each other. That is, the first connector C1 is connected to the main board 110 in the first direction.

[0086] The main connector CM and the first connector C1 are board-to-board connectors for connecting the boards together. At least one of the main connector CM and the first connector C1 may be a floating connector designed to absorb positional errors by moving relative to the main board 110 and the sub-board 120.

[0087] The main connector CM supports the sub-board 120 via the first connector C1. Therefore, the main board 110 supports the rear end of the sub-board 120. In addition, the first metal plate 10F supports the sub-board 120 via the main board 110.

[0088] In the second direction, the connection portion between the second harness H2 and the low-voltage power supply board 140 is located closer to the sub-board 120 than to the main board 110. The connection portion between the second harness H2 and the low-voltage power supply board 140 is located at the other end of the low-voltage power supply board 140 in the second direction, i.e., the front end.

[0089] The image forming apparatus 1 further includes a second metal plate 130 as an example of a metal plate, an electric clutch 170 , and a gear train 190 .

[0090] The second metal plate 130 is fixed to the main housing 10. The second metal plate 130 is a metal plate and extends in a direction perpendicular to the first direction. The second metal plate 130 supports the main motor 160. The sub-board 120 is detachably supported by the second metal plate 130.

[0091] In the first direction, the second metal plate 130 is located between the main board 110 and the sub-board 120. The main board 110 and the second metal plate 130 are located at different positions in the second direction. Specifically, the second metal plate 130 is located in front of the main board 110.

[0092] The second metal sheet 130 is disposed on one side of the first metal sheet 10F in the first direction. The second metal sheet 130 is located in front of the first metal sheet 10F. The rear end of the metal sheet 130 is located in front of the front end of the main board 110. In this embodiment, the second metal sheet 130 is electrically connected to the first metal sheet 10F by a ground wire (not shown).

[0093] The second metal sheet 130 has a convex portion 131 that protrudes toward the sub-substrate 120. The sub-substrate 120 is fixed to the convex portion 131 with a screw N. The convex portion 131 protrudes to one side in the first direction when the sub-substrate 120 is fixed to the second metal sheet 130. The convex portion 131 serves as a spacer that ensures a distance between the sub-substrate 120 and the portion of the second metal sheet 130 other than the convex portion 131 when the sub-substrate 120 is fixed to the second metal sheet 130. The convex portion 131 is formed by bending the metal sheet 130. The convex portion 131 has an attachment surface 131M for attaching a screw N (see FIG. 5 ). The attachment surface 131M extends in a direction perpendicular to the first direction.

[0094] The electric clutch 170 is switchable between a transmission state in which the driving force from the main motor 160 is transmitted to the pickup roller 33 and a disconnection state in which the driving force from the main motor 160 is not transmitted to the pickup roller 33 .

[0095] The gear train 190 is made up of a plurality of gears and is in mesh with a motor gear MG provided on the output shaft of the main motor 160 and the electric clutch 170. The gear train 190 receives driving force from the main motor 160 and transmits the driving force to the pickup roller 33 via the electric clutch 170.

[0096] The electric clutch 170 and the gear train 190 are located on the other side in the second direction from the main motor 160. In the second direction, the main board 110, the sub-board 120, the main motor 160, and the pickup roller 33 are arranged in this order. Therefore, in the second direction, the sub-board 120 is disposed between the main motor 160 and the main board 110.

[0097] Here, the main body housing 10 has a first region RE1 and a second region RE2. The first region RE1 is located outside the photosensitive drum 61 in the first direction and is a region on one side of the photosensitive drum 61 in the first direction. The second region RE2 is located outside the photosensitive drum 61 in the first direction and is a region on the other side of the photosensitive drum 61 in the first direction.

[0098] The main board 110, the sub-board 120, the second metal plate 130, the main motor 160, the electric clutch 170, and the gear train 190 are all arranged in the first region RE1. The low-voltage power supply board 140 and the high-voltage power supply board 150 are arranged in the second region RE2.

[0099] The main body housing 10 has a first end 1E and a second end 2E. The first end 1E is the left end of the main body housing 10, i.e., the end of the main body housing 10 closest to the first region RE1 in the first direction. The second end 2E is the right end of the main body housing 10, i.e., the end of the main body housing 10 farther from the first region RE1 than the first end 1E in the first direction.

[0100] The distance D1 between the sub-substrate 120 and the first end 1E is smaller than the distance D2 between the main substrate 110 and the first end 1E (D1<D2). Furthermore, the distance D1 between the sub-substrate 120 and the first end 1E is smaller than the distance D3 between the second metal sheet 130 and the first end 1E (D1<D3). In this embodiment, the distance D3 between the second metal sheet 130 and the first end 1E is smaller than the distance D2 between the main substrate 110 and the first end 1E (D3<D2). Thus, in this embodiment, of the main substrate 110, the sub-substrate 120, and the second metal sheet 130, the sub-substrate 120 is located on the outermost side of the first region RE1, and the main substrate 110 is located on the innermost side.

[0101] The mounting surfaces of the main board 110 and the sub-board 120 face in a first direction. In this embodiment, the mounting surface of the main board 110 faces one side in the first direction, i.e., toward the left. The ASIC 111 is disposed on the surface of the main board 110 facing the first end 1E. The mounting surface of the sub-board 120 faces the other side in the first direction, i.e., toward the right. That is, the DC / DC converter 121 is disposed on the surface of the sub-board 120 facing the second end 2E.

[0102] The second harness H2 extends from the first region RE1 to the second region RE2 along the first direction. Specifically, the second harness H2 extends from the first region RE1 to the second region RE2, passing through a region on one side of the rotation axis 61X of the photosensitive drum 61 in the second direction.

[0103] The main board 110 and the sub-board 120 are located in an area on one side of the rotation axis 61X of the photosensitive drum 61 in the second direction.

[0104] As shown in Figures 4 and 5, the sub-substrate 120 can be attached to and detached from the main body housing 10 from one side in the first direction. Therefore, the main body housing 10 has a second opening 12 and a side cover 12A on one side in the first direction. The second opening 12 is an opening formed in the first region RE1. The second opening 12 is an opening for attaching and detaching the sub-substrate 120. The side cover 12A can be attached and detached to and from the main body housing 10, and when attached, it covers the second opening 12. Furthermore, when the side cover 12A is removed, the second opening 12 is opened, and the sub-substrate 120 can be attached and detached through the second opening 12.

[0105] When removing the sub-board 120 from the main body housing 10, the side cover 12A is removed from the state shown in FIG. 4 to the state shown in FIG. 5. When the side cover 12A is removed, the second opening 12 is opened. With the second opening 12 open, the user removes the corresponding harness terminals from the second connector C2, the third connector C3, the fourth connector C4, the fifth connector C5, and the sixth connector C6. Then, the user removes the two screws N (see also FIG. 2) located at the front of the sub-board 120.

[0106] After removing each connector and screw N, the user pulls the sub-board 120 to one side in the first direction, for example, to the left. Pulling the sub-board 120 to one side in the first direction disconnects the first connector C1 of the sub-board 120 from the main connector CM of the main board 110, and the sub-board 120 can be pulled out to one side in the first direction, for example, to the left.

[0107] When attaching the sub-board 120 to the main housing 10, the side cover 12A is removed and the sub-board 120 is inserted into the second opening 12. Then, the first connector C1 of the sub-board 120 is faced to the main connector CM of the main board 110 and pushed in. This connects the first connector C1 to the main connector CM, allowing the rear of the sub-board 120 to be attached to the main board 110. In this state, the front of the sub-board 120 is fixed to the second metal plate 130 with screws N. This fixes the front and rear of the sub-board 120 to the main housing 10.

[0108] Once the sub-board 120 is fixed to the main body housing 10, the corresponding harness terminals are connected to the second connector C2, the third connector C3, the fourth connector C4, the fifth connector C5, and the sixth connector C6. After connecting each connector, the side cover 12A is attached to the main body housing 10. In this way, the sub-board 120 can be easily attached to and detached from the main board 110 from one side in the first direction.

[0109] 6, when viewed from the first direction, the main motor 160 at least partially overlaps with the sub-board 120. In this embodiment, when viewed from the first direction, the upper part of the main motor 160 overlaps with the sub-board 120, but the lower part does not overlap with the sub-board 120.

[0110] The first connector C1 is disposed at one end of the sub-board 120 in the second direction. The rear end of the sub-board 120 is fixed by the first connector C1. As described above, the other end of the sub-board 120 in the second direction is engaged with the second metal plate 130. The rear end of the sub-board 120 is fixed to the main board 110 by a connector, and the front end is fixed to the second metal plate 130 by two screws N, one at the top and one at the bottom. In this way, the sub-board 120 is detachably supported by the second metal plate 130.

[0111] The DC / DC converter 121 overlaps the second metal plate 130 when viewed from the first direction. The main motor drive circuit 122 overlaps the second metal plate 130 when viewed from the first direction. The polygon motor drive circuit 123 overlaps the second metal plate 130 when viewed from the first direction.

[0112] Here, the transmission path of the power supplied from the low-voltage power supply board 140 and the transmission path of the control signal sent from the ASIC 111 will be described.

[0113] 3, the DC / DC converter 121 is supplied with a DC voltage of the first voltage via the third connector C3 from the AC / DC converter 141. As described above, the DC / DC converter 121 converts the DC voltage of the first voltage into a DC voltage of the second voltage that is lower than the first voltage.

[0114] The ASIC 111 is supplied with a DC voltage of the second voltage from the DC / DC converter 121 via the first connector C1, and is then supplied with a DC voltage converted to a third voltage by the sub-converter 112. The amount of power supplied from the low-voltage power supply board 140 to the DC / DC converter 121 and the like is adjusted based on a control signal sent from the ASIC 111.

[0115] The main motor drive circuit 122 receives a DC voltage of the first voltage from the AC / DC converter 141 via the third connector C3. Based on a control signal sent from the ASIC 111, the main motor drive circuit 122 converts the DC voltage of the first voltage into a drive voltage for the main motor 160 and outputs it to the main motor 160 via the second connector C2. The ASIC 111 sends a control signal to the main motor 160 via the first connector C1 and the second connector C2. The ASIC 111 also receives a signal from the main motor 160 via the second connector C2 and the first connector C1.

[0116] The polygon motor drive circuit 123 receives a first DC voltage from the AC / DC converter 141 via the third connector C3. Based on a control signal sent from the ASIC 111, the polygon motor drive circuit 123 converts the first DC voltage into a drive voltage for the polygon motor 53 and outputs it to the polygon motor 53 via the seventh connector C7. The ASIC 111 sends a control signal to the polygon motor 53 via the first connector C1 and the seventh connector C7. The ASIC 111 also receives a signal from the polygon motor 53 via the seventh connector C7 and the first connector C1.

[0117] The charging voltage application circuit 151 receives power from the low-voltage power supply board 140 via the sub-board 120, without passing through the main board 110. More specifically, the charging voltage application circuit 151 receives a first DC voltage via the third connector C3 and the fourth connector C4 from the AC / DC converter 141. The charging voltage application circuit 151 outputs a charging voltage to the charger 62 based on a control signal sent from the ASIC 111 via the first connector C1 and the fourth connector C4.

[0118] The developing voltage application circuit 152 receives power from the low-voltage power supply board 140 via the sub-board 120, without passing through the main board 110. More specifically, the developing voltage application circuit 152 receives a first DC voltage via the third connector C3 and the fourth connector C4 from the AC / DC converter 141. The developing voltage application circuit 152 outputs a developing voltage to the developing roller 64 based on a control signal sent from the ASIC 111 via the first connector C1 and the fourth connector C4.

[0119] The transfer voltage application circuit 153 receives power from the low-voltage power supply board 140 via the sub-board 120, without passing through the main board 110. More specifically, the transfer voltage application circuit 153 receives a first DC voltage via the third connector C3 and the fourth connector C4 from the AC / DC converter 141. The transfer voltage application circuit 153 outputs a transfer voltage to the transfer roller 63 based on a control signal sent from the ASIC 111 via the first connector C1 and the fourth connector C4.

[0120] The ASIC 111 transmits a control signal to the optical device 51 via the connector board 120 and controls the emission of laser light from the optical device 51. More specifically, the ASIC 111 transmits a control signal to the optical device 51 via the first connector C1 and the sixth connector C6 and controls the emission of laser light from the optical device 51. The ASIC 111 also receives a signal from the optical device 51 via the sixth connector C6 and the first connector C1.

[0121] The ASIC 111 can receive commands input to the operation panel 180 via the sub-board 120 and can also send messages to the operation panel 180. Specifically, the ASIC 111 receives commands input from the operation panel ASIC 181 via the fifth connector C5 and the first connector C1. The ASIC 111 also sends messages to the operation panel ASIC 181 via the first connector C1 and the fifth connector C5.

[0122] The LCD 182 is supplied with a DC voltage of the first voltage from the AC / DC converter 141 via the third connector C3 and the fifth connector C5.

[0123] As a result of the above, the present embodiment can achieve the following advantages: In the image forming apparatus 1, the sub-board 120 on which the DC / DC converter 121 is arranged is located outside the main board 110 and the second metal plate 130. This makes it easy to replace the DC / DC converter 121.

[0124] In addition, the sub-board 120 is connected directly to the main board 110 without a harness, which reduces the number of harnesses required. Furthermore, since the harness does not get in the way when replacing the sub-board 120, it is easy to replace the sub-board 120.

[0125] Furthermore, one end of the sub-board 120 in the second direction is connected to the main board 110 by a connector, and the other end of the sub-board 120 in the second direction is fixed to the second metal plate 130 by a screw N. This makes it easier to replace the sub-board 120 compared to when both ends in the second direction are fixed by the screw N.

[0126] Furthermore, because DC / DC converter 121 is disposed on the surface of sub-substrate 120 facing second end 2E, it is possible to prevent a user from touching DC / DC converter 121 when replacing sub-substrate 120. Furthermore, because DC / DC converter 121 does not protrude from sub-substrate 120 toward side cover 12A, it is possible to prevent image forming apparatus 1 from becoming larger in size in the first direction.

[0127] Furthermore, the main board 110 and the second metal plate 130 are located at different positions in the second direction, so that when attaching the first connector C1 of the sub-board 120 to the main board 110, the second metal plate 130 does not get in the way, making it easier to attach the first connector C1 to the main board 110.

[0128] Furthermore, the DC / DC converter 121 overlaps the second metal plate 130 when viewed from the first direction. Therefore, when the sub-board 120 is attached, the second metal plate 130 is located on the other side of the DC / DC converter 121 in the first direction and covers the DC / DC converter 121. As a result, the second metal plate 130 can serve as an enclosure for the DC / DC converter 121.

[0129] Furthermore, the main motor drive circuit 122 overlaps the second metal plate 130 when viewed from the first direction. Therefore, when the sub-board 120 is attached, it is located on the other side of the main motor drive circuit 122 in the first direction and covers the main motor drive circuit 122. As a result, the second metal plate 130 can serve as an enclosure for the main motor drive circuit 122.

[0130] Furthermore, the polygon motor drive circuit 123 overlaps the second metal plate 130 when viewed from the first direction. Therefore, when the sub-board 120 is attached, it is located on the other side of the polygon motor drive circuit 123 in the first direction and covers the polygon motor drive circuit 123. As a result, the second metal plate 130 can serve as an enclosure for the polygon motor drive circuit 123.

[0131] In addition, the second metal sheet 130 has a protrusion 131 that protrudes toward the sub-substrate 120, and the protrusion 131 serves as a spacer that ensures a distance between the sub-substrate 120 and the portion of the second metal sheet 130 other than the protrusion 131. This makes it possible to prevent the DC / DC converter 121, the main motor drive circuit 122, and the polygon motor drive circuit 123 from coming into contact with the second metal sheet 130.

[0132] The sub-board 120 also has a second connector C2 to which a terminal of a first harness H1 that connects the main motor 160 is connected, and the main motor 160 at least partially overlaps the sub-board 120 when viewed from the first direction, which allows the first harness H1 to be shortened.

[0133] Furthermore, because the main board 110 and the sub-board 120 are located in the first region RE1 and the low-voltage power supply board 140 is located in the second region RE2, the main board 110 and the sub-board 120 can be prevented from being affected by electromagnetic waves emitted by the low-voltage power supply board 140. The sub-board 120 has a third connector C3 to which a terminal of a second harness H2 that connects the low-voltage power supply board 140 is connected. This allows the DC / DC converter 121 of the sub-board 120 to receive the first direct current voltage without passing through the main board 110.

[0134] In addition, in the second direction, the connection portion between the second harness H2 and the low-voltage power supply board 140 is disposed closer to the sub-board 120 than to the main board 110. This allows the second harness H2 to be shortened.

[0135] In addition, in the first direction, the second metal plate 130 is disposed between the main motor 160 and the sub-board 120. This prevents the user from touching the main motor 160 when replacing the sub-board 120.

[0136] Next, a second embodiment will be described. The same reference numerals will be used to designate parts common to the first embodiment, and the description thereof will be omitted.

[0137] In the first embodiment, the main board 110 and the sub-board 120 are connected directly to each other via a board-to-board harness, whereas in the second embodiment, the main board 110 and the sub-board 120 are connected to each other via a harness.

[0138] 7, in the second embodiment, the main connector 211 of the main board 210 and the first connector 221 of the sub-board 220 are connected by a sixth harness H6, and the main board 210 and the sub-board 220 are connected by a bracket BK.

[0139] The bracket BK has one end fixed to the main board 210 by a first screw N1 and the other end fixed to the sub-board 220 by a second screw N2.

[0140] In the second embodiment, the sub-board 120 is fixed at both the front end and the rear end by screws.

[0141] When removing the sub-board 220, in addition to the procedure of the first embodiment, it is sufficient to remove the sixth harness H6 from the first connector 221 and remove the second screw N2.

[0142] In the second embodiment as well, the sub-board 220 on which the DC / DC converter 121 is arranged is located outside the main board 210 and the second metal plate 130, so that the DC / DC converter 121 can be easily replaced.

[0143] Next, a third embodiment will be described. The same reference numerals will be used to designate parts common to the first embodiment, and the description thereof will be omitted.

[0144] In the first embodiment, the DC / DC converter 121 overlaps the second metal plate 130 when viewed from the first direction, and when the sub-board 120 is attached, the second metal plate 130 faces the DC / DC converter 121, whereas in the third embodiment, the main board 110 faces the DC / DC converter 121.

[0145] 8 , the end of the main board 310 in the third embodiment on the other side in the second direction extends further in the second direction than the main board 110 in the first embodiment. As a result, the DC / DC converter 121 overlaps the main board 310 when viewed from the first direction. As a result, when the sub-board 120 is attached, the main board 310 is located on the other side in the first direction of the DC / DC converter 121 and covers the DC / DC converter 121. As a result, the main board 310 can serve as an enclosure for the DC / DC converter 121.

[0146] The sub-board 120 further includes a main motor driving circuit 122 that outputs driving power to the main motor 160. The main motor driving circuit 122 overlaps the main board 310 when viewed from the first direction. Therefore, the main board 310 can serve as an enclosure for the main motor driving circuit 122.

[0147] Next, a fourth embodiment will be described. The same reference numerals will be used to designate parts common to the first embodiment, and the description thereof will be omitted.

[0148] The fourth embodiment differs from the first embodiment in that the high-voltage power supply board 150, the operation panel 180, and the circuit board 50A of the optical device 51 are connected directly to the main board 110 without going through the sub-board 120.

[0149] 9 and 10 , in the fourth embodiment, a fourth connector C4, a fifth connector C5, and a sixth connector C6 are arranged on the main board 110. The high-voltage power supply board 150 and the main board 110 are connected by a third harness H3. The operation panel 180 and the main board 110 are connected by a fourth harness H4. The circuit board 50A of the optical device 51 and the main board 110 are connected by a fifth harness H5.

[0150] In the fourth embodiment, as in the first embodiment, the sub-board 120 on which the DC / DC converter 121 is arranged is located outside the main board 110 and the second metal plate 130. This makes it easy to replace the DC / DC converter 121.

[0151] Although the embodiment has been described above, the image forming apparatus 1 can be modified as appropriate as exemplified below.

[0152] In the above-described embodiment, the front end of the sub-board 120 is fixed to the second metal plate 130 with two screws, one at the top and one at the bottom, but the number of screws may be one, or three or more. The method of fixing the sub-board 120 may be a method other than fixing with screws, such as a method of engaging a circuit board with a hook or a method of fixing with a magnet.

[0153] In the above-described embodiment, the main connector CM of the main board 110 and the first connector C1 of the sub-board 120 face each other in the first direction, but they may face each other in a direction different from the first direction. For example, if the main connector CM and the first connector C1 face each other in the second direction, the main board 110 is pulled out from the second direction. Also, if the main connector CM and the first connector C1 face each other in the vertical direction, the main board 110 is pulled out from the vertical direction.

[0154] In the above-described embodiment, the main motor drive circuit 122 and the polygon motor drive circuit 123 are arranged on the sub-board 120, but the configuration may also be such that at least one of the main motor drive circuit 122 and the polygon motor drive circuit 123 is arranged on the main board 110.

[0155] In the above-described embodiment, the main board has an ASIC as the main control circuit, but the main board may have a main control circuit other than an ASIC, such as a CPU.

[0156] In the above-described embodiment, the main motor drives the image forming unit and the transport unit, but the main motor may be configured to drive the image forming unit without driving the transport unit, or may be configured to drive the transport unit without driving the image forming unit.Furthermore, the main motor may be configured to drive a part of the image forming unit without driving the transport unit, or may be configured to drive a part of the transport unit without driving the image forming unit.

[0157] In the above-described embodiment, the image forming unit 40 is configured to transfer the toner image formed on the photosensitive drum 61 to the sheet S using the transfer roller 63, i.e., a so-called direct transfer configuration. However, the image forming unit may also be configured to include an intermediate transfer belt and transfer the toner image formed on the photosensitive drum from the intermediate transfer belt to the sheet, i.e., a so-called intermediate transfer configuration.

[0158] In each of the above-described embodiments, the low-voltage power supply board 140 and the high-voltage power supply board 150 are not directly connected, but they may be directly connected to each other. In particular, in the fourth embodiment, the low-voltage power supply board 140 and the high-voltage power supply board 150 are directly connected to each other, which allows the power lines to be shortened.

[0159] In the above-described embodiment, the image forming apparatus 1 is a monochrome printer, but the image forming apparatus may be, for example, a color printer. The image forming apparatus may also be a copier, a multifunction peripheral, or the like. In the embodiment, an electrophotographic image forming apparatus is exemplified, but the image forming apparatus may also be, for example, an inkjet image forming apparatus, a dot impact image forming apparatus, or the like.

[0160] The elements described in the embodiments and modifications may be implemented in any combination.

[0161] REFERENCE SIGNS LIST 1 image forming apparatus 1E first end 2E second end 10 main body housing 61 photosensitive drum 110 main board 111 ASIC 120 sub-board 121 DC / DC converter 130 second metal plate 140 low-voltage power supply board 141 AC / DC converter 160 main motor RE1 first region RE2 second region

Claims

1. A device comprising: a main body housing; a photosensitive drum rotatable around a rotation axis extending in a first direction; a main motor that provides a driving force to the photosensitive drum; a metal plate that supports the main motor; an AC / DC converter that converts AC voltage supplied from a commercial power source into a DC voltage of a first voltage; a main board that has an ASIC that controls the main motor and whose board mounting surface faces the first direction; and a sub-board that has a DC / DC converter that converts the DC voltage of the first voltage into a DC voltage of a second voltage lower than the first voltage and is electrically connected to the main board, the sub-board being detachably supported by the metal plate; the main board, the sub-board, and the main motor are located in a first area that is on one side of the photosensitive drum in the first direction and is outside the photosensitive drum in the first direction; and the main body housing has a first end that is closer to the first area in the first direction and a second end that is farther from the first area in the first direction than the first end; An image forming apparatus, characterized in that the distance between the sub-board and the first end is smaller than the distance between the main board and the first end, and is also smaller than the distance between the metal plate and the first end.

2. The image forming apparatus according to claim 1, wherein the sub-board has a first connector that is directly connected to the main board without a harness.

3. An image forming apparatus according to claim 2, wherein at least a portion of the sub-board faces the main board in the first direction, and the first connector is connected to the main board in the first direction.

4. The image forming device described in claim 2, characterized in that the first connector is arranged at one end of the sub-board in the vertical direction and in a second direction perpendicular to the first direction, and the other end of the sub-board in the second direction is engaged with the metal plate.

5. The image forming apparatus according to claim 1, wherein the DC / DC converter is disposed on a surface of the sub-board facing the second end.

6. The image forming apparatus according to claim 5, wherein the metal plate is located between the main board and the sub-board in the first direction.

7. The image forming apparatus according to claim 6, wherein the main board and the metal plate are positioned at different positions in the vertical direction and in a second direction perpendicular to the first direction.

8. The image forming apparatus according to claim 6, wherein the DC / DC converter overlaps with the metal plate when viewed from the first direction.

9. The image forming apparatus according to claim 8, wherein the sub-board further has a main motor drive circuit that outputs drive power to the main motor, and the main motor drive circuit overlaps with the metal plate when viewed from the first direction.

10. An image forming apparatus according to claim 6, wherein the metal plate has a protrusion that protrudes toward the sub-board, and the sub-board is fixed to the protrusion with a screw.

11. The image forming apparatus described in claim 1, characterized in that the sub-board has a second connector to which a terminal of a first harness that connects the main motor is connected, and the main motor at least partially overlaps with the sub-board when viewed from a first direction.

12. The image forming apparatus according to claim 1, further comprising a low-voltage power supply board having the AC / DC converter, the low-voltage power supply board being arranged in a second area that is on the other side of the photosensitive drum in the first direction opposite to the one side in the first direction and that is outside the photosensitive drum in the first direction, and the sub-board having a third connector to which a terminal of a second harness that connects the low-voltage power supply board is connected.

13. An image forming apparatus as described in claim 12, characterized in that in the vertical direction and in a second direction perpendicular to the first direction, the connection portion between the second harness and the low-voltage power supply board is positioned closer to the sub-board than to the main board.

14. The image forming device described in claim 1 further comprising a pickup roller that receives driving force from the main motor to feed sheets stored in a sheet tray toward a photosensitive drum, and a gear train that transmits driving force from the main motor to the pickup roller, the gear train being arranged in the first area, wherein the main board, sub-board, main motor and pickup roller are arranged in this order in the vertical direction and in a second direction perpendicular to the first direction.

15. The image forming apparatus according to claim 1, wherein the DC / DC converter faces the main board.

16. An image forming apparatus as described in claim 15, wherein the sub-board further has a main motor drive circuit that outputs drive power to the main motor, and the main motor drive circuit overlaps with the main board when viewed from a first direction.

17. The image forming apparatus according to claim 1, wherein the metal plate is disposed between the main motor and the sub-board in the first direction.

Images