JPH11174364A - Optical scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the excessive temperature rise of electronic parts. SOLUTION: A circuit board 28 on which the respective parts of a light deflector 10 are disposed is fixed by a housing 18. A groove is engraved on the housing 18 so as to form a gap as an air inflow port 42 between the housing 18 and the back surface of the circuit board 28 when the circuit board 28 is fixed by the housing 18. When the conduction of current to a coil for driving 32 is switched and a rotor 16 is rotated, air flows in from the port 42 and the current of air is generated in a gap formed between a magnet for driving 14 and the coil 32. The air flowing in from the port 42 goes toward an IC for driving 40 by the action of the generated current of air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a laser printer,
The present invention relates to an optical scanning device used for a facsimile, a copying machine, a display, and the like.

[0002]

2. Description of the Related Art Conventionally, an image recording apparatus such as a laser printer or a copying machine uses an optical scanning apparatus provided with a rotary polygon mirror for scanning a light beam onto an image carrier such as a photosensitive material or a photosensitive member. .

As shown in FIG. 9, when light from an optical scanning device 103 is applied to the surface of a photosensitive member 106 which is charged by a charger 108 and rotates in the direction of arrow A (see arrow B), a developing device is developed. 110 attaches the toner. The toner attached to the photoconductor 106 is transferred to a transfer charger 112.
Is transferred from the surface of the photoconductor 106 to the sheet 114. The paper 114 is transported in the direction of arrow C by the transport roller pair 118, and the toner on the paper 114 is melted and fixed by a fixing device (not shown). After the transfer of the toner to the sheet 114, the toner remaining on the surface of the photoconductor 106 is removed by the cleaner 120.

[0004] As shown in FIG. 10, an optical scanning device 103 is configured such that light emitted from a laser light source 122 passes through a cylindrical lens 124 and is rotated by a rotating polygon mirror 104 that rotates in the direction of arrow D about a rotation axis 130. Be deflected. The deflected light passes through the fθ lens group 126, the cylindrical mirror 128, and the transmission glass (not shown), and is applied to the photoconductor 106. The optical scanning device 103 having the above configuration includes one optical component as shown in FIG.
And is sealed in a casing 116 for dust prevention and the like. Recently, the image recording apparatus 1
At 00, the rotating polygon mirror 104 is rotated at a high speed in order to increase the recording speed and resolution. Therefore, the temperature of the electronic components of the optical deflector 102 provided in the optical scanning device 103 increases.

On the other hand, as shown in FIG.
An optical scanning device 103A has been proposed in which a heat generating portion 132 such as an electronic component and a radiation fin 133 are disposed outside the optical scanning device, and the optical deflector 102A is cooled by a cooling fan 134 attached to the image recording apparatus main body. Also,
Other than during image formation (standby) in the image recording apparatus,
An optical scanning device that suppresses a temperature rise by stopping the rotation of the rotary polygon mirror 104 has also been proposed.

On the other hand, optical deflectors 102B and 102C for cooling without using a cooling fan 134 have also been proposed (Japanese Patent Application Laid-Open Nos. 6-258588, 3-279910 and 1-113218). . This is shown in FIG.
2 (A) and (B), the circuit board 136
A radiation fin 140 is attached to an electronic component (driving IC) 138 disposed in the device, and cooling is performed using wind generated by rotation of the rotating polygon mirror 104. The optical deflector 102D shown in FIG.
Is provided with a plurality of blades 144 on the periphery of a rotating body 142 that rotates together with the rotating polygon mirror 104, and the blades 144 are rotated during rotation.
It is configured to cool using the wind generated by this.

[0007]

In recent years, image recording apparatuses such as laser printers and copiers have been required to reduce noise and save energy due to environmental regulations in various countries. For this reason, it has been considered to reduce the number of cooling fans 134 provided in the main body of the image recording apparatus 100 or to reduce the air volume of the cooling fans 134. However, reducing the number of cooling fans 134 or reducing the air volume has a problem that a sufficient air volume cannot be obtained for cooling the optical deflector 102A, and the cooling effect is reduced. Further, since it is necessary to attach a driving IC for driving the rotary polygon mirror 104 and the cooling fan 134 to the optical deflector 102A, there is a problem that it is difficult to reduce the size of the device.

Further, in the image recording apparatus 100, an air layer is formed between the fixed rotating shaft and the rotary bearing in accordance with the rotation in order to increase the recording speed and increase the resolution, and the rotating multi-face is formed through the air layer. An optical deflector 102 that supports the mirror 104 (dynamic pressure air bearing) may be used. In this optical deflector 102,
When the rotating polygon mirror 104 is activated, the fixed shaft and the rotating shaft come into contact with each other to generate wear powder. Therefore, if the method of stopping the rotation of the rotary polygon mirror 104 is adopted other than at the time of image formation in the image recording apparatus 100, the number of startups of the rotary polygon mirror 104 increases, so that the amount of wear powder increases and the bearings are damaged. And the optical deflector 102 may be damaged. In addition, if the method of stopping the rotation of the rotating polygon mirror 104 is adopted, the time required for the rotating polygon mirror 104 to reach a predetermined number of rotations and be ready for printing takes an extra time compared to the case of constant rotation. First print time is longer.

In addition, in the optical deflectors 102B and 102C which attach cooling fins 140 to the driving IC 138 and cool by utilizing the wind when the rotating polygon mirror 104 rotates,
It is necessary to provide fins of aluminum or the like. For this reason, there is a possibility that the cost for configuring the optical deflectors 102B and 102C increases and the optical deflectors 102B and 102C increase in size in the height direction. Further, when the rotating polygon mirror 104 is small, for example, as in the case of an overfilled optical system, or when the number of faces of the rotating polygon mirror 104 is large, there is a problem that a sufficient cooling effect cannot be obtained because the wind generated by rotation is weak. .

Further, the blades 14 are provided on the periphery of the rotating body 142.
And an optical deflector 102 that cools using the wind generated from the blade portion 144 by the rotation of the rotating body 142.
In D, a sound is generated when the rotating body 142 rotates due to the provision of the blade portion 144. Therefore, it is incompatible with the tendency to reduce noise and energy saving due to an increase in input current.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has as its object to provide an optical scanning device capable of preventing an excessive rise in temperature of electronic components.

[0012]

According to a first aspect of the present invention, there is provided a control circuit board having one end face opposed to a surface on which electronic components of a control circuit board are provided and attached to a rotating body. An optical scanning device that includes an optical deflector, and deflects light emitted from a light source by rotation of a rotary polygon mirror provided in the optical deflector and scans an image carrier through a plurality of optical components, An inflow means for causing air to flow in a direction of a rotation axis of the optical deflector from a direction different from a surface of the control circuit board on which the electronic components are arranged by rotation of the rotary polygon mirror; and an inflow means when the optical deflector rotates. Guide means for guiding the air flowed in by a predetermined direction,
And the air guided by the guiding means is directed to electronic components provided on the control circuit board.

According to the first aspect of the present invention, the optical scanning device is provided with an inflow means for inflowing air from a direction different from a surface of the control circuit board on which the electronic components are provided. At this time, the air flowing in from the inflow means flows in the rotation axis direction of the optical deflector. The inflow means is formed, for example, by forming a groove in a fixing member for fixing a control circuit board on which electronic components are provided. By reducing the cross-sectional area of the plane perpendicular to the traveling direction of the air, that is, by forming the inflow means as a groove formed in the fixing member to be thin, it is possible to place the electron on the control circuit board outside the outer periphery of the optical deflector. It is possible to increase the flow velocity of the air flowing in from a direction different from the surface on which the components are arranged.

Further, the optical scanning device is provided with guide means for guiding the air introduced by the inflow means in a predetermined direction when the optical deflector rotates. In other words, the air introduced by the inflow means is guided so as to be directed to the electronic components provided on the control circuit board. As the guiding means, the air introduced by the inflow means by the wind generated in the gap formed between the optical deflector and the control circuit board when the optical deflector rotates, as in the invention according to claim 4 May be guided in a predetermined direction.

Therefore, the air that has flowed in by the inflow means is directed to the electronic components provided on the control circuit board, so that the electronic components are cooled and an excessive rise in temperature can be prevented.

The optical deflector is a dynamic pressure air bearing type optical deflector as in the third aspect of the present invention, and forms an air layer between the shaft and the shaft according to rotation. The optical deflector may be an optical deflector that is axially supported through the optical deflector, that is, an optical deflector that forms a dynamic pressure air bearing when the optical deflector rotates.

According to a second aspect of the present invention, there is provided an optical deflector having one end face opposed to a face different from the face on which the electronic components of the control circuit board are provided and attached to a rotating body, and emitting light from a light source. An optical scanning device which deflects the emitted light by rotation of a rotary polygon mirror provided in the optical deflector and scans the image carrier via a plurality of optical components, wherein the control circuit is rotated by rotation of the rotary polygon mirror. Inflow means for flowing air together with heat generated from the electronic component in the direction of the rotation axis of the optical deflector from the direction of the arrangement surface of the electronic component on the substrate,
Guide means for guiding air introduced by the inflow means in a predetermined direction when the optical deflector rotates.

According to the second aspect of the present invention, an inflow means for inflowing air from the surface of the control circuit board on which the electronic components are disposed, and a guide for guiding the inflow air in a predetermined direction. Means are provided. At this time,
Since the inflow means inflows air from the direction of the arrangement surface of the electronic components on the control circuit board, heat generated from the electronic components flows in with the air. By guiding the heated air thus introduced in a predetermined direction by the guide means, that is, outside the optical scanning device, an excessive rise in temperature due to heat generation of the electronic components can be prevented.

[0019]

1 and 2 show an optical deflector 10 provided in an optical scanning device according to an embodiment of the present invention. In the optical deflector 10 shown in FIG.
The figure shows a state in which a rotating body 16 including a polygon mirror 12 for deflecting light emitted from a light source (not shown), a driving magnet 14, and the like has been removed.

As shown in FIGS. 1 and 2, the optical scanning device 10 is configured by arranging a plurality of components such as a driving coil 32 and a driving IC 40 on the surface of a circuit board 28. The circuit board 28 includes a rectangular portion 28A formed in a rectangular shape.
And a circular portion 28B formed in a circular shape, and a connecting portion 28C
Connected by The circuit board 28 is fixed to the housing 18 by a plurality of screws 48 (three in this embodiment). The housing 18 fixes the circuit board 28, attaches a fixed side shaft 20, which will be described later, and covers the optical deflector 10. However, in the present embodiment (FIGS. 1 and 2), only a part of the housing 18 to which the circuit board 28 is fixed and the fixed-side shaft 20 is mounted is shown.

On the outer periphery of the circular portion 28B of the circuit board 28,
An annular member 38 is provided along the outer periphery. The annular member 38 is formed in a substantially annular shape in which a part corresponding to the connection portion 28C of the circuit board 28 is an opening. The fixed-side floating magnet 36 is fixed to the upper part of the annular member 38 in the height direction by an adhesive or the like.

Inside the circular portion 28B of the circuit board 28,
A drive coil 32 wound around a winding shaft is provided at predetermined intervals along the circumference of the circular portion 28B. One of the driving coils 32 is disposed on a straight line connecting the rotation center O of the rotating body 16 and the driving IC 40. The rotating body 1 is located at the center of the winding shaft of the driving coil 32.
6 is provided with a position detecting element 50 for detecting the rotational position. As the position detecting element 50, for example, a Hall element or the like is used. Drive magnet 1 by position detecting element 50
4 are detected, and the position of the rotating body 16 is detected. After the position of the rotating body 16 is detected by the position detecting element 50, when the energization of the driving coil 32 is switched, the rotating body 16 rotates at a predetermined speed.

A drive IC 40 for driving the polygon mirror 12 is provided near the opening of the annular member 38 in the rectangular portion 28A of the circuit board 28, ie, near the boundary between the rectangular portion 28A and the connection portion 28C of the circuit board 28. It is arranged. The driving IC 40 has a foot height such that the center of the driving IC 40 in the thickness direction substantially corresponds to the gap between the driving magnet 14 and the driving coil 32 formed when the rotating body 16 rotates. Adjusted and arranged.

A fixed side shaft 20 made of, for example, ceramics is attached to a substantially central portion of the housing 18 described above.
The fixed side shaft 20 is fixed by a screw 22 and the fixed side shaft 2
The screw 22 can be attached by inserting a screw 22 from one end to the other end in the length direction of the zero and screwing an end of the screw 22 to a screw screw portion 30 provided in the housing 18. . A groove (bearing groove) 26 having a depth of about several μm is formed on the outer peripheral surface of the fixed shaft 20. Thereby, the fixed side shaft 20 and the rotating body 1
When 6 rotates, external air is sucked.

Further, a groove 62 is formed in the housing 18. When the circuit board 28 is fixed by the housing 18 by forming the groove 62, a gap is generated between the housing 18 and the back surface of the circuit board 28. This gap becomes the air inlet 42, and the fixed side shaft 2 and the fixed body 2
External air flows in due to the suction effect of the groove 26 formed on the outer peripheral surface of the zero. Note that the groove 62 formed in the housing 18 is preferably formed narrow in order to increase the flow velocity of the inflowing air.

A hollow cylindrical rotating side sleeve 24 is inserted through the fixed side shaft 20. The rotating side sleeve 24 is also made of, for example, ceramics, and has a fixed side shaft 20.
And rotates at a high speed in a predetermined direction. Thereby, air flows in from the air inlet 42, and an air layer (dynamic pressure air bearing) is formed between the fixed-side shaft 20 and the rotation-side sleeve 24. In FIG. 1, the fixed side shaft 20 and the rotating side sleeve 24
Are actually in contact with each other, but a gap of about 2 to 8 μm is actually formed, and they rotate without contact.

A ring-shaped flange 46 is fixed at a predetermined position on the outer peripheral portion of the rotating sleeve 24. By attaching flanges 46 having different thicknesses as needed, the position of the polygon mirror 12 in the direction perpendicular to the plane of the circuit board 28 can be adjusted. Therefore, the optical scanning device provided with the optical deflector 10 can surely scan an image carrier such as a photosensitive material or a photosensitive member with the light emitted and deflected from a light source (not shown).

On the upper surface of the flange 46, there is provided a polygonal mirror 12 having a polygonal column shape and a side surface mirror-finished.
Are arranged. The polygon mirror 12 is fixed from above by a pressing member 44 such as a spring to prevent the position from changing during rotation.

On the other hand, the driving magnet 14 is fixed to the lower portion of the flange 46 with an adhesive or the like. Drive magnet 1
Numeral 4 is ring-shaped, and when the number of magnetic poles is 8, the N pole and the S pole are magnetized so that the sections adjacent to each section divided into eight equal parts at 45 ° central angles have different poles. I have. The driving magnet 14 is integrally formed with a rotation-side floating magnet 34. In other words, the rotation-side levitation magnet 34 is formed at a position where the outer peripheral surface of the rotation-side levitation magnet 34 is radially opposed to the inner periphery of the fixed-side levitation magnet 36 described above. The outer peripheral surface of the magnet 34 and the inner peripheral surface of the fixed-side levitation magnet 36 are magnetized so that an attractive force acts. The attraction force exerted by the rotating-side floating magnet 34 and the fixed-side floating magnet 36 acts to float the entire rotating body 16. As a result, the position of the rotating body 16, that is, the polygon mirror 12, in the direction perpendicular to the plane of the circuit board 28 is determined.

On the other hand, the horizontal position of the rotating body 16, that is, the polygon mirror 12, is such that a dynamic pressure air bearing is formed between the fixed side shaft 20 and the rotating side sleeve 24, and The side sleeve 24 is held by rotating at a high speed in a non-contact state.

The rotating sleeve 24, the polygon mirror 12, the holding member 44, the flange 46, the driving magnet 1 described above.
4 and a rotating body 16 composed of a rotating side floating magnet 34
Generates wind in a gap formed between the driving coil 32 and the driving magnet 14 by rotating together with the fixed side shaft 20. Circular portion 28B and connection portion 2 of circuit board 28
An annular member 38 is provided on the outer periphery of 8C to prevent the wind generated at the time of rotation of the rotating body 16 from being scattered, and guides the air flowing in from the air inlet 42 in a predetermined direction. Guide member 52 is provided.
As a result, the air that has flowed in from the air inlet 42 is driven by the action of wind generated when the rotating body 16 rotates.
Pointed to 40.

Next, the operation of the embodiment of the present invention will be described. When the energization of the driving coil 32 is switched, the rotating body 16 rotates. At this time, since an attractive force acts between the inner peripheral surface of the fixed-side floating magnet 36 and the outer peripheral surface of the rotating-side floating magnet 34, the position of the rotating body 16 in the direction perpendicular to the plane of the circuit board 28 is increased. Is held in place.

When the rotating body 16 rotates, external air flows in from the air inlet 42 by the action of the groove 26 formed on the outer peripheral surface of the fixed shaft 20 constituting the rotating body 16. Thereby, the fixed side shaft 20 and the rotating side sleeve 24
And air enters between them to form a dynamic pressure air bearing, and the horizontal position of the rotating body 16 with respect to the plane of the circuit board 28 is maintained. Further, a dynamic pressure air bearing is formed between the fixed side shaft 20 and the rotating side sleeve 24, and the rotating body 16
Due to the high speed rotation, the pressure in the dynamic pressure air bearing becomes higher than the surrounding pressure. On the other hand, the gap formed below the fixed shaft 20 in the thickness direction and between the rotating body 16 and the circuit board 28, that is, the pressure in the lower part of the hydrodynamic air bearing (hereinafter, referred to as the bearing lower part 54) is low. Become.

Therefore, in the bearing lower portion 54, air is further introduced from the air inlet 42 in order to restore the reduced pressure. A part of the introduced air is used to form a dynamic pressure air bearing, while the remaining air rotates together with the rotating body 16. At this time, wind is generated in the gap formed between the driving magnet 14 and the driving coil 32 due to the rotation of the rotating body 16. Due to the wind generated in this way, the air flowing in from the air inlet 42 is
0 is guided in the arranged direction (see arrow Y shown in FIG. 1A). Therefore, air (wind) is applied to the driving IC 40.
Hits and cools.

As described above, when the rotating body 16 of the optical deflector 10 rotates, air from the outside flows in, and this air is
The drive IC 40, which generates heat easily because it is guided to C40
Can be cooled. Therefore, an excessive rise in temperature of the driving IC 40 can be prevented.

Table 1 below shows specific experimental results obtained by measuring the temperature of the driving IC 40.

[0037]

[Table 1]

This is, as explained in this embodiment,
Driving when the driving IC 40 is cooled by guiding the air flowing in at the time of rotation of the rotating body 16 to the driving IC 40, and when the driving IC 40 is not cooled without forming the air inlet 42 and the like. It is an experimental result comparing the temperature rise of the IC 40 for use. 200 polygon mirrors
When rotated at 00 rpm, as shown in Table 1,
The temperature rise of the driving IC 40 when cooled is 51.0 ° C.
The temperature of the driving IC 40 when not cooled is 75.8 ° C. That is, a reduction effect of −24.8 ° C. was obtained. Therefore, the optical scanning device 1 according to the present embodiment
0 is effective for cooling the drive IC 40 provided on the circuit board 28.

In this embodiment, the case where the rotation center O of the rotating body 16, the coil 32, and the driving IC 40 are arranged in a straight line has been described as an example. However, the present invention is not limited to this. For example, as shown in FIG.
A configuration may be adopted in which air flows out from a gap between the adjacent coils 32 provided in 8. That is, the rotation center of the rotating body 16, the coil 32, and the driving IC 40 can be arranged at any positions.

It should be noted that, since the coils 32 are arranged at predetermined intervals, turbulent air flow may occur between adjacent coils 32 and the like. In order to prevent such turbulence from occurring, a ring member 56 is attached to the upper surface of the coil 32 as shown in FIG.
As shown in (B), an adhesive 58 such as a UV agent may be embedded between the adjacent coils 32 or in the inner periphery of the winding shaft of the coil 32. Accordingly, the wind generated between the driving magnet 14 and the coil 32 during the rotation of the rotating body 16 does not flow between the adjacent coils 32 or the inner peripheral portion of the winding shaft of the coil 32, so that the air flow The air introduced from the inlet 42 is guided toward the driving IC 40 in a more uniform state. Therefore, the driving IC 40 is cooled more efficiently, and the cooling effect can be improved.

In this embodiment, the rotation of the rotating body 16 causes the fixed shaft 20 and the rotating sleeve 24 to rotate.
Although the optical deflector 10 forming a dynamic pressure air bearing between them has been described, the present invention is not limited to this. further,
In the present embodiment, the case where the driving magnet 14 and the rotation-side levitation magnet 34 are integrally formed has been described, but the present invention is not limited to this. For example, they may be formed separately as shown in FIG.

In this embodiment, the guide member 52 is provided on the circuit board 28 so that the air flowing from the air inlet 42 is directed to the driving IC 40. However, the present invention is not limited to this. is not. For example, FIG.
As shown in (2), the guide member 52A may be provided in a housing (only a part of the housing is shown in the first embodiment) that covers each component provided in the optical deflector 10. Good.

The optical deflector 10 according to the present embodiment
Can be configured by changing the arrangement position of the coil 32 as shown in FIG. That is, in the optical deflector 10A shown in FIG.
Is arranged. In this case, the housing 18A is the coil 3
By forming the concave portion in consideration of the two convex portions, the air inlet 42 is formed between the concave portion and the back surface of the circuit board 28. In the optical deflector 10A having such a configuration, the gap formed by the driving magnet 14 and the circuit board 28 is substantially flat, so that the air flowing in from the air inlet 42 is guided toward the driving IC 40. Sometimes turbulence does not occur. Therefore, the driving IC 40 can be efficiently cooled. In addition, by housing the coil 32 inside the housing 18, the optical deflector 10A can be flattened in the direction of the rotation axis of the rotating body 16, so that the size of the device can be reduced.

The above-described optical deflectors 10 and 10A have an example in which air introduced from the air inlet 42 is guided toward the driving IC 40 by the action of wind generated when the rotating body 16 rotates. The driving IC
The arrangement position of 40 is not limited to this.

For example, as in an optical deflector 10B shown in FIG. 7, a driving IC 40 may be provided on the back surface of the circuit board 28 near the air inlet 42. With this configuration, when the rotating body 16 rotates, the air inlet 42
And heat generated from the driving IC 40 together with external air flows in at the same time. Thus, the temperature rise of the driving IC 40 can be suppressed, and it is not necessary to configure the optical scanning device in consideration of the turbulence of air due to the wind generated when the rotating body 16 rotates. Note that, as shown in FIG. 7, it is preferable to dispose the guide member 60 so that heat generated from the driving IC 40 flows in efficiently from the air inlet 42.

As shown in FIG. 8, the coil 32 is disposed on the back surface of the circuit board 28 in the same manner as in the optical scanning device 10A, and the driving IC 40 is connected to the circuit board 28 in the same manner as in the optical scanning device 10B. Air inlet 42
May be arranged in the vicinity of the optical scanning device 10C.

[0047]

As described above, according to the present invention, when the optical deflector rotates, air flows from the outer periphery of the optical deflector and from the back side of the control circuit board in the direction of the rotation axis, It guides the incoming air toward the electronic components,
Electronic components can be cooled to prevent temperature rise.
It has an excellent effect.

Further, when the optical deflector rotates, air flows in the rotation axis direction from the outer side of the optical deflector and from the back side of the control circuit board and heat generated from the electronic components flows. It has an excellent effect that the temperature rise of the electronic component can be prevented.

Further, there is no need to use special parts such as heat radiation fins, so that there is an excellent effect that the cost can be reduced and the device can be reduced in size and flattened.

Further, since self-cooling becomes possible, there is no need to provide a separate cooling fan, and there is an excellent effect that cost reduction and space saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating a configuration of an optical deflector of an optical scanning device according to an embodiment of the present invention.

FIG. 2 is a schematic top view showing the upper surface of a circuit board.

FIG. 3 is a schematic diagram of a top surface of a circuit board when a rotation center of a rotating body, a coil, and an arrangement position of a driving IC are changed as another embodiment.

FIG. 4 is a schematic side view showing the vicinity of a coil of the optical scanning device configured to prevent turbulence generated between adjacent coils. (A) shows an optical scanning device in which a ring member is arranged on the upper surface of a coil to prevent turbulence, and (B) is bonded between adjacent coils and the inner peripheral portion of a winding shaft for winding the coil. 1 shows an optical scanning device in which an agent or the like is embedded.

FIG. 5 is a schematic configuration diagram illustrating a configuration of an optical scanning device according to another embodiment.

FIG. 6 is a schematic configuration diagram illustrating a configuration of an optical scanning device in which a coil is disposed on a back surface of a circuit board.

FIG. 7 is a schematic configuration diagram illustrating a configuration of an optical scanning device in which a driving IC is provided on a back surface of a circuit board, and heat generated from the driving IC is sucked from an air inlet when the rotating body rotates.

FIG. 8 is a schematic configuration diagram showing a configuration of an optical scanning device in which a coil and a driving IC are provided on a back surface of a circuit board.

FIG. 9 is a schematic configuration diagram of an image recording apparatus provided with an optical scanning device using a rotating polygon mirror.

FIG. 10 is a schematic configuration diagram illustrating a configuration of an optical scanning device.

FIG. 11 is a schematic configuration diagram showing a conventional optical scanning device;
This is an optical scanning device having a heating unit provided outside and a cooling fan provided separately.

FIG. 12 is a schematic configuration diagram showing a conventional optical scanning device.
(A) and (B) show an optical scanning device in which a radiation ID is attached to a driving ID, and (C) shows an optical scanning device configured to cool by heat generated from a blade attached to a rotating body. ing.

[Explanation of symbols]

 Reference Signs List 10 optical deflector 16 rotating body 28 circuit board 40 driving IC 42 air inlet

Claims (4)

[Claims] 1. An optical deflector having one end face opposed to a surface of a control circuit board on which electronic components are provided and attached to a rotating body, wherein light emitted from a light source is provided in the optical deflector. An optical scanning device that deflects by rotation of the rotating polygon mirror and scans the image carrier via a plurality of optical components, and the surface of the control circuit board on which the electronic components are disposed by rotation of the rotating polygon mirror. Inflow means for flowing air from different directions in the direction of the rotation axis of the optical deflector, and guide means for guiding air introduced by the inflow means in a predetermined direction during rotation of the optical deflector, The air scanning device, wherein the air guided by the guiding means is directed to an electronic component provided on the control circuit board. 2. An optical deflector having one end face opposed to a face different from the face on which the electronic components of the control circuit board are provided, and having an optical deflector attached to a rotating body, wherein light emitted from a light source is deflected by the light. An optical scanning device that deflects by rotation of a rotary polygon mirror provided in a device and scans an image carrier via a plurality of optical components, and disposes electronic components on the control circuit board by rotation of the rotary polygon mirror. Inflow means for flowing air together with heat generated from the electronic component in a direction of a rotation axis of the optical deflector from a plane direction; and a guide for guiding air introduced by the inflow means in a predetermined direction when the optical deflector rotates. An optical scanning device comprising: 3. The optical deflector is a dynamic pressure air bearing type optical deflector, wherein an air layer is formed between the optical deflector and a shaft in accordance with rotation, and the optical deflector is supported via the air layer. The optical scanning device according to claim 1 or 2, wherein 4. The guide means causes air introduced by the inflow means to flow in a predetermined direction by wind generated in a gap formed between the optical deflector and a control circuit board when the optical deflector rotates. The optical scanning device according to claim 1, wherein guidance is provided.