JP6936969B2 - Light irradiation device - Google Patents

Description

The present invention relates to a light irradiation device.

Conventionally, there is a photocuring device that cures an object by ultraviolet rays. For example, as an image forming apparatus, there is an apparatus provided with an ink head that ejects UV ink that is a photocurable object and a light irradiating apparatus that irradiates ultraviolet rays, and UV ink is worked from the ink head (for example, paper or paper). A desired image is formed (printed) by ejecting the ejected UV ink onto a film or the like) and then irradiating the ejected UV ink with ultraviolet rays to cure the ink.

Conventionally, a discharge lamp that radiates ultraviolet rays has been used in a light irradiation device used in a photocuring device. However, in recent years, since there are advantages such as low energy consumption and long life, a configuration using an LED light source instead of a discharge lamp has been adopted. As such an LED light source, one in which a plurality of LED chips are arranged in a matrix is adopted (see, for example, Patent Document 1).

JP-A-2017-126534 JP 2016-198892

In the device configuration described in Patent Document 1, heat is exchanged by circulating cooling air through the heat sink, and the air (exhaust air) warmed by the heat sink is discharged to the outside of the device housing. However, if the exhaust opening is arranged in the vicinity of the photocurable surface, there is a problem that most of the exhaust air flows to the work and warms the photocurable object on the work surface. As a result, for example, there is a possibility of affecting the photocuring process of the photocurable object and a possibility of deforming the work. In addition, there is a concern that the work may flutter and uneven curing may occur due to the exhaust air flowing through the work.

On the other hand, in the apparatus configuration described in Patent Document 2, since the exhaust air is discharged in the direction away from the work, it becomes difficult for the exhaust air to flow to the work. However, the exhaust air flows in the vicinity of the intake opening, and the warmed gas is taken in, which deteriorates the cooling efficiency of the device.

In view of the above, it is an object of the present invention to provide a device configuration capable of appropriately controlling the exhaust direction of the exhaust air discharged from the housing.

The light irradiation device according to the present invention includes a light source unit in which a plurality of LEDs are arranged and a heat sink provided on the back surface side of the light source unit, and a cooling fan is provided facing the heat sink. In the light irradiation device, the heat sink is provided with a plurality of heat radiation fins arranged side by side in one direction with a gap, and the cooling air from the cooling fan is circulated through the gap of the heat radiation fins. The heat sink is provided with a discharge flow path on the downstream side of the cooling air. Further, the discharge flow path portion includes a first opening that opens adjacent to the heat sink and a second opening that opens to the outside of the housing, and communicates the first opening and the second opening. The rectifying flow path portion is provided, and the rectifying flow path portion has a flow path length longer than the opening width of the first opening in the flow path direction, and is in a direction away from the light source portion. It is extended, and the first opening and the second opening are characterized in that they are formed in the circumferential direction of the rectifying flow path portion with respect to the flow path direction.

With the above configuration, the exhaust air that has been heat-exchanged by the heat sink is rectified by the exhaust flow path and discharged in the desired direction, preventing the work from being adversely affected by the exhaust air and causing the exhaust air to flow. It is possible to prevent the intake from being taken in from the intake opening again.

Furthermore, the second opening may have a configuration in which the opening area is narrower than that of the first opening. As a result, the flow velocity of the exhaust air discharged can be increased, and the discharge direction of the exhaust air can be controlled.

Further, inside the exhaust flow path portion, a wind guide portion that protrudes from the vicinity of the second opening in the direction of narrowing the flow path may be provided. As a result, in addition to increasing the flow velocity of the exhaust air, it becomes easier to control the flow of the exhaust air.

Furthermore, the rectifying flow path portion has a long flow path cross section in a direction intersecting the flow path direction of the exhaust air, and a partition portion is provided inside the rectifying flow path portion. The flow path cross section may be divided into a plurality of regions by a partition portion. As a result, when the cross section of the flow path is long, it is possible to prevent the effect of rectifying the exhaust air from being impaired and to perform appropriate exhaust.

Furthermore, a plurality of unit units in which a light source unit and a cooling fan are paired are provided inside the housing, and each unit unit may be divided by a partition wall so that they do not communicate with each other. I do not care. As a result, a cooling mechanism can be assembled for each unit, and variations in cooling efficiency can be suppressed.

Further, the intake opening of the housing may be provided with a filter that projects to the outside of the housing so as to be separated from the intake opening while covering the intake opening. Furthermore, the filter may be installed by being sandwiched between a first holding portion that abuts on the inside thereof and a second holding portion that abuts on the outside thereof. As a result, it is possible to suppress a reduction in the amount of cooling air taken in from the intake opening by providing the filter.

According to the present invention, the flow of the exhaust air is rectified by the exhaust flow path portion, and the exhaust air can be discharged in a desired direction. As a result, the flow of the exhaust air can be controlled, and the harmful effects of the exhaust air on the peripheral portion can be prevented.

The external view of the light irradiation apparatus which concerns on this invention. The sectional view of the light irradiation apparatus which concerns on this invention. The schematic diagram explaining the flow of the exhaust air. The schematic diagram explaining the shielding effect of ink mist. The schematic which shows the other embodiment of the light irradiation apparatus which concerns on this invention. The cross-sectional schematic diagram explaining the internal structure of the light irradiation apparatus which concerns on this invention. The external view of the light irradiation apparatus which concerns on this invention. The sectional view of the light irradiation apparatus which concerns on this invention. The schematic diagram explaining the function of a filter installation unit. The schematic diagram explaining the structure of the filter installation unit.

FIG. 1 shows an external view of the light irradiation device according to the present invention. The device housing is provided with a light emitting portion 11 attached to one end side 12 thereof, and an intake opening 30 provided on the other end side 13. Further, in the figure, light irradiation is performed from the light emitting portion 11 in the Z-axis direction. Further, in the device housing, one end 12 and the other end 13 have a long flat surface in the longitudinal direction (Y direction), and the one end 12 and the other end 13 are formed in the lateral direction of the device housing. A side wall end portion 15 for connecting and a side wall portion 14 for connecting one end portion 12 and the other end portion 13 in the longitudinal direction are provided. Further, the intake opening 30 is provided with a filter 53 for removing dust and ink mist in the outside world, and it is desirable that the intake opening 30 is configured so as not to take in dust and ink mist inside the apparatus housing.

FIG. 2 shows a schematic cross-sectional view of the light irradiation device according to the present invention. Inside the device housing, a light source unit 20 is provided on one end side 12 of the housing. A plurality of LEDs are arranged on the substrate of the light source unit 20, and a plurality of LEDs are arranged side by side on the XY plane in the figure. In the present embodiment, the light source unit 20 forms a long light emitting surface in the Y direction (the depth direction of the paper surface in FIG. 2). Further, the optical axis (light emission direction) of each LED is directed to the Z direction, and light is irradiated from the light emitting unit 11 to the outside of the device housing.
A heat sink 21 is attached to the back surface side of the light source unit 20. The heat sink 21 is provided with a plurality of flat plate-shaped heat radiating fins 22, and the heat radiating fins 22 are arranged side by side at intervals in the longitudinal direction (Y direction) of the housing. Then, as the cooling air flows between the heat radiation fins 22, heat exchange is performed from the heat sink 21 to promote cooling. Further, inside the device housing, an electrical component 24 such as a control system of the light source unit 20 and a power supply system is installed and is provided in the flow path path of the cooling air. As a result, the electrical component 24 can be cooled at the same time.

An intake opening 30 is provided on the other end side 13 of the housing. The cooling fan 23 provided in the device housing takes in the outside air into the device housing through the intake opening 30, and promotes cooling of the electrical component 24 and the heat sink 21. In the embodiment shown in FIG. 2, the cooling fan 23 is installed in the vicinity of the intake opening 30, but the location where the cooling fan 23 is installed is not limited to this. Further, the air (exhaust air) warmed by heat exchange in the heat sink 21 is discharged to the outside of the apparatus housing via the exhaust flow path portion 40.

Next, the exhaust flow path portion 40 will be described. The exhaust flow path portion 40 includes a first opening 41 adjacent to the heat sink 21, a second opening 42 that opens to the outside of the housing, and the first opening 41 and the second opening 42. A rectifying flow path portion 43 that communicates with the rectifying flow path portion 43 is provided. The rectifying flow path portion 43 has a flow path length 43D longer than the opening width 41D of the first opening 41 in the flow direction of the exhaust air, and a cylindrical flow path is formed. In the present embodiment, the rectifying flow path portion 43 includes a flow path length 43D that is long in the Z direction, and the exhaust air flows in the Z direction. Then, the exhaust air is discharged to the outside of the housing from the second opening 42 via the rectifying flow path portion 43.
With the above configuration, the exhaust air taken in from the first opening 41 is rectified by the rectifying flow path portion 43, and is discharged from the second opening 42. This makes it easier to align the exhaust air discharge directions in one direction, and makes it easier to control the exhaust directions.

The rectifying effect according to the present invention will be described with reference to FIG. Generally, in an air-cooled light irradiation device 90 using a cooling fan 96, the cooling fan 96 is arranged so as to face the heat sink 97, and the cooling air from the cooling fan 96 collides with the heat sink 97 to cause each of the heat sinks 97. Cooling is promoted by passing air through the heat sink fins. In the direction in which the heat radiating fins are arranged side by side (Y direction in FIG. 3), a certain degree of rectifying action can be expected by the radiating fins, but a sufficient rectifying action cannot be obtained because the distance through which the radiating fins circulate is short. Further, the flow of wind is not controlled in the vertical direction of the heat radiation fins (the Z direction in FIG. 3A), and the wind direction angle 94α of the exhaust air from the heat sink 97 tends to spread in a wide angle.
On the other hand, as shown in FIG. 3B, in the light irradiation device 10 according to the present invention, the exhaust air from the heat sink 21 is circulated to the exhaust flow path portion 40, and the rectifying action of the wind is enhanced by the rectifying flow path portion 43. Be done. As a result, the wind direction angle 42α of the exhaust air discharged to the outside of the housing is narrowed, and the exhaust direction can be controlled.

FIG. 4 describes the ink mist shielding effect according to the embodiment of the present invention.
FIG. 4 shows a schematic view of an image forming apparatus equipped with the light irradiation apparatus 10 according to the present invention. The light irradiation device 10 is installed in the vicinity of the ink head 60, and a work W (recording medium) such as paper or film is relatively scanned in one direction. The ink head 60 is provided with an ink ejection unit 61. Ink is ejected from the ink ejection unit 61 to the work W on the upstream side of the scanning direction SD, and light is irradiated on the downstream side to apply the ink to the work W. The ink is cured.

It is known that ink mist P is generated in the vicinity of the ejection portion 61 at the time of ink ejection. These are gaseous fine particles with a particle size of 0.1 μm to 10 μm, which diffuse to the surroundings along with the flow of the atmosphere. In particular, it is considered that the ink mist P is likely to be distributed in the scanning direction SD because the work W is relatively scanned in one direction. If the ink mist P enters the inside of the housing through the intake opening 30 of the light irradiation device 10, it may adhere to the electrical component 24 inside the housing and cause problems such as poor lighting, which is a problem.

The light irradiation device according to the present invention can adjust the rectified exhaust air in a desired exhaust direction. As shown in FIG. 4, since the second opening 42 of the exhaust flow path portion 40 extends in the direction (Y direction) orthogonal to the scanning direction SD of the work W (recording medium), the second opening 42 of the second opening 42 In the extension direction, a wind barrier is formed against the ink mist P rising from the work W. As a result, the movement path of the ink mist P from the work W to the intake opening 30 can be shielded by the exhaust air, and the invasion of the ink mist P into the intake opening 30 can be suppressed.
In this way, by arranging the long second opening 42 in the intersecting direction with respect to the scanning direction SD of the work W, the moving path of the floating ink mist P is shielded by the exhaust air, and the ink ejection portion. It is possible to suppress the invasion of the ink mist P generated from 61. This shielding effect becomes remarkable by enhancing the rectifying effect of the exhaust air.

FIG. 5 shows another embodiment of the light irradiation device according to the present invention. In this embodiment, the air guide portion 44 is provided inside the exhaust flow path portion 40, and specifically, the air guide portion 44 is guided so as to project from a position adjacent to the second opening 42 in a direction narrowing the exhaust flow path. The wind section 44 is attached.
As a result, the airflow toward the second opening 42 bypasses the periphery of the air guide portion 44 and is discharged from the second opening 42, which has the effect of further narrowing the wind direction angle 42α of the exhaust air. This makes it possible to adjust the exhaust direction of the exhaust air more accurately.
The shape of the air guide portion 44 may be any shape as long as it diverts the airflow toward the second opening 42. For example, a plate shape or a curved shape may be used, or a component having a triangular cross-sectional shape may be used. It is also possible to adjust the installation angle of the wind guide 44 (the angle of inclination of the second opening 42 with respect to the opening surface). By extending the air guide portion 44 in the long direction (Y direction) of the second opening 42, it is possible to control the flow of the exhaust air flow with high accuracy. As shown in FIG. 5, the intake opening 30 of the present device may be a porous opening in which a plurality of small openings are densely packed. In addition, various intake shapes can be adopted as long as they have an intake function.

The exhaust flow path portion 40 according to the present invention includes a first opening 41 that opens adjacent to the heat sink 21, and a second opening 42 that opens outside the housing, and the second opening 42 is the first opening. It is arranged in a direction away from the light source unit 20 with respect to the opening 41. Further, a rectifying flow path portion 43 that communicates the first opening portion 41 and the second opening portion 42 is provided. The rectifying flow path portion 43 has a flow path length 43D longer than the opening width 41D of the first opening in the flow path direction (Z direction). By passing through the exhaust flow passage 40, the exhaust air from the heat sink 21 is rectified. Further, the first opening 41 and the second opening 42 are arranged so as to be separated from each other in the circumferential direction of the traveling direction axis of the flow path with respect to the flow path direction (Z direction) of the rectifying flow path portion 43. Thereby, the exhaust air can be controlled so that the exhaust air discharged from the heat sink does not flow in the vicinity of the work W and the intake opening 30. Here, the traveling direction axis of the flow path refers to the flow path direction flowing through the rectifying flow path portion 43, and may be regarded as the long direction of the rectifying flow path portion 43.

Further, in the exhaust flow path portion 40, in order to enhance the rectifying effect of the air flow, it is preferable that the corner portion 47 whose direction changes in the flow path direction is rounded. A vortex is likely to occur at a portion where the direction of the airflow changes, but the occurrence of the vortex can be reduced by making the corner 47 round.

The light irradiation device 10 according to the present invention can enhance the rectifying effect of the exhaust air by the exhaust flow path portion 40 and control the discharge direction of the exhaust air. Therefore, it is not necessary to attach a component that controls the flow of wind to the outside of the housing. This makes it possible to avoid complicated specifications such as attaching a separate component to the side wall portion 14 of the device housing, and since the side wall portion 14 of the housing is flat without protrusions, the outer shape of the housing is simple. Therefore, it becomes easy to install the light irradiation device 10 in various places (for example, a narrow installation area).

FIG. 6 shows a schematic cross-sectional view (ZY cross-sectional view) of the light irradiation device 10 shown in FIG. As shown in FIG. 6A, when forming a long light source width, it is preferable that a plurality of light source units 20, a heat sink 21, and a cooling fan 23 are arranged side by side in one direction. Further, in the embodiment shown in FIG. 6A, a partition wall 25 is provided inside the housing to divide the space inside the housing. More specifically, in the divided space, a predetermined number of light source units 20, heat sink 21, cooling fan 23, and intake opening 30 are unitized, and cooling paths are independently provided for each unit. There is. Therefore, the cooling air does not interfere with each other between the unit units. By making the cooling flow path independent by the partition wall 25 in this way, the cooling efficiency can be adjusted for each unit, and the temperature unevenness of each light source unit 20 in the light source width direction (Y direction) can be suppressed. Further, by providing a cooling mechanism for each unit unit, it becomes easy to adjust the light source width by varying the number of unit units installed according to the work size.

Further, FIG. 6B shows the structure of the flow path cross section 43S (flow path cross section orthogonal to the flow path direction Z) of the rectifying flow path portion 43, and an embodiment in which the partition portion 45 is provided in the rectifying flow path portion. Is described. In the drawing, a first opening (not shown) is formed on the peripheral surface 46 of the rectifying flow path portion 43, and the exhaust air passing through the radiating fins 22 flows into the rectifying flow path portion 43. When forming a long light source width, the flow path cross section 43S of the rectifying flow path portion 43 must also be long in the light source width direction (Y direction). On the other hand, the rectifying effect is reduced as the flow path cross section 43S becomes longer in the Y direction. In particular, the difference in airflow between the end region and the center region of the flow path cross section 43S becomes large, and the flow of exhaust air differs depending on the location. On the other hand, by providing the partition portion 45 that divides the flow path cross section 43S in the light source width direction (Y direction), the light source portion 20 can be appropriately cooled without deteriorating the rectifying effect.

Next, the intake opening will be examined in detail. 7 and 8 disclose a configuration in which the filter installation unit 50 is provided in the intake opening 30 of the light irradiation device 10. The filter installation unit 50 is installed so as to cover the intake opening 30, and has a shape protruding outward from the housing (a shape protruding in the Z direction) with respect to the intake opening 30. Further, the filter installation unit 50 is sandwiched between a first holding portion 51 that holds the inside of the filter 53B and a second holding portion 52 that holds the outside of the filter 53B, and an intake surface of the filter 53B is arranged. As a result, the filter 53B is arranged apart from the intake opening 30 so as to cover the entire area of the intake opening 30.

FIG. 9 shows the action and effect of the filter installation unit described above. There are various types of the filter 53 depending on the size of the fine particles to be captured. As the size of the fine particles to be captured becomes smaller, it is necessary to make the mesh of the filter 53 smaller and increase the thickness of the filter 53. For example, in a light irradiation device for an image forming apparatus, it is considered a problem that ink mist P is generated from the ejection portion 61 of the ink head 60 and invades into the apparatus housing of the light irradiation apparatus 10.

The particle size of the ink mist is very small, 0.1 μm to 10 μm, and the filter that captures these must have a small mesh and a large filter thickness. Ink mist also easily adheres and accumulates. On the other hand, there is also a problem that it becomes difficult to take in the cooling air into the apparatus housing by using a filter having a large thickness. This is because the air resistance increases due to the filter and the flow of cooling air is obstructed. In addition, since the flow of cooling air is hindered by the accumulation of ink mist, there is also a problem that the frequency of filter replacement must be increased in order to maintain the desired cooling efficiency.

However, the above problem can be solved by using the filter installation unit 50 described in this document. As shown in FIG. 9A, in a normal apparatus configuration, the filter 53A obstructs the flow of cooling air from the intake opening 30. Here, for the sake of explanation, the wind before being affected by the air resistance by the filter 53 is drawn with a solid line, and the wind after being affected by the air resistance by the filter 53 is shown with a broken line. As shown in the figure, the intake of air from the intake opening 30 is hindered by the filter 53, so that the cooling efficiency deteriorates.

On the other hand, in the filter installation unit 50 described in the present document, the arrangement surface thereof is separated from the opening surface of the intake opening 30, and the filter 53B is arranged and held so that the entire area of the intake opening 30 is covered. There is. As a result, it is possible to secure a large intake area of the filter 53B with respect to the area of the intake opening 30, and it is possible to suppress a decrease in cooling efficiency.
FIG. 9B shows the conceptual diagram. For the wind that has passed through the filter 53B, the flow rate of the cooling air per unit time is reduced due to the influence of the air resistance by the filter 53B. However, in the embodiment shown in FIG. 9B, the inflow path of the cooling air is increased by increasing the intake area of the filter 53B. That is, the flow rate of the air passing through the filter 53B can be increased, and the decrease in the flow rate of the cooling air flowing through the intake opening 30 per unit time can be suppressed.

An embodiment of the filter installation unit 50 according to the present invention is shown in FIG. The first holding portion 51 is composed of a first supporting portion 511 that partially contacts the filter inner surface 532 and a holding end portion 514 that holds the first supporting portion 511.

The first support portion 511 shown in FIG. 10 has a saddle-shaped appearance and is composed of a framed grid-like frame. Since the air circulates in the space (gap) surrounded by this frame, the cooling air can circulate while holding the filter 53B. The shape and size of the filter 53B and the first support portion 511 are determined so that the gap between the frames of the first support portion 511 is completely covered by the filter 53B. Further, the first support portion 511 may have a protrusion 513 formed at a portion that comes into contact with the filter 53B. As a result, the positional deviation of the filter 53B can be further prevented. In particular, by forming the protrusion 513 along the outer edge of the filter 53B, the positional deviation of the filter 53B can be effectively prevented. The frame of the first support portion 511 is not limited to a grid pattern. Other shapes may be adopted as long as a large gap between the frames is secured and cooling air can flow.

The filter 53B is provided so as to cover the first support portion 511. As a result, it is possible to secure a large area of the filter outer surface 531 (filter intake surface) of the filter 53B with respect to the intake opening 30.

Further, the second holding portion 52 is brought into contact with the outer surface of the filter 531. As shown in FIG. 10, the second holding portion 52 has a shape in which the frame is bent so that one end 52a and the other end 52b are folded back, and has a U-shaped or U-shaped appearance shape. More specifically, it includes a second support portion 521 bent along the outer surface of the filter 531 and engaging protrusions 522 formed at both ends (52a, 52b) of the second support portion 521. The second support portion 521 is composed of a framed grid-like frame, and cooling air can be circulated from the space (gap) surrounded by the frame. The frame shape of the second support portion 521 is not limited to a grid pattern. Other shapes can be adopted as long as a large gap between the frames is secured and cooling air is circulated.

Engagement protrusions 522 are provided at both ends (52a, 52b) of the second holding portion 52, and are configured to be engaged with the engaging receiving portion 512 of the first holding portion 51. The engaging protrusion 522 projects outward (a surface that does not come into contact with the filter outer surface 531), whereby the engagement with the first holding portion 51 can be strengthened. More specifically, since the filter 53B is sandwiched between the first holding portion 51 and the second holding portion 52, the elastic force of the filter 53B causes the inside of the second holding portion 52 (the side that comes into contact with the filter outer surface 531). A force acts toward the outside (the side that does not come into contact with the filter outer surface 531). At this time, the engaging protrusion 522 of the second holding portion 52 projects outward, and an engaging relationship is established between the inside of the first holding portion 51 and the outside of the second holding portion 52.
Therefore, the force (urging force) acting from the inside to the outside due to the elastic force of the filter works in the direction of strengthening the engagement between the first holding portion and the second holding portion, and the holding of the filter 53b can be further strengthened. can.

Further, the second holding portion 52 has a shape bent so that one end 52a and the other end 52b are folded back, and it becomes easy to bend the second holding portion 52 in the direction in which the one end 52a and the other end 52b face each other (X direction). Therefore, by grasping both ends (52a, 52b) of the second holding portion 52, the frame can be bent from the outside to the inside, and the engagement relationship between the first holding portion 51 and the second holding portion 52 can be released. In this way, the filter 53B can be easily attached and detached.
With the above configuration, the filter 53B is sandwiched between the first holding portion 51 and the second holding portion 52, and the engaging projection portion 522 of the second holding portion 52 and the engaging receiving portion 512 of the first holding portion 51 are sandwiched between the first holding portion 51 and the second holding portion 52. The filter 53B can be held by engaging with.

A plurality of filter installation units 50 described in this document may be attached to the light irradiation device 10. In particular, when a plurality of filter installation units 50 are arranged side by side, it is preferable to install the filter installation units 50 so that the filter outer surfaces 531 (filter intake surfaces) do not face each other. This is because if the intake surfaces of the filters 53B face each other, the intake directions are branched in two directions, and the efficiency of taking in the cooling air of each filter 53B deteriorates. Therefore, it is desirable that the filter installation units 50 are arranged side by side so that the filter outer surfaces 531 (filter intake surfaces) are aligned in the same direction.
For example, as shown in FIG. 7, the filter outer surface 531 (filter intake surface) is oriented in the circumferential direction (direction orthogonal to the Y direction) with respect to the parallel arrangement direction (Y direction) of the filter installation unit 50. Is desirable to be placed.

Further, it is preferable that a plurality of filter installation units 50 are arranged side by side in the direction along the second opening 42 of the light irradiation device 10. Thereby, the invasion of the ink mist P can be suppressed more preferably. More specifically, the rectified exhaust air is discharged from the second opening 42, and forms a wind barrier against the ink mist P floating from the work W (recording medium). Therefore, by arranging the filter installation units 50 in parallel along the second opening 42, the amount of ink mist P reaching the filter outer surface 531 (filter intake surface) can be reduced, and the life of the filter 53B is further extended. be able to.

With the above configuration, the light irradiation device according to the present invention rectifies the exhaust air from the heat sink by providing the discharge flow path portion, and then discharges the exhaust air to the outside of the housing. As a result, the exhaust air can be discharged in a desired direction, and the discharge direction can be adjusted.

Further, in the light irradiation device according to the present invention, a filter installation unit is provided for the intake opening, and the filter is arranged apart from the intake processing portion so as to cover the intake opening, whereby the outer surface of the filter is formed. (Filter intake surface) can be secured widely. As a result, even when a thick filter is attached, it is possible to suppress a decrease in the flow rate of the cooling air per unit time.

10 Light irradiation device 11 Light emission unit 12 One end of the device housing 13 The other end of the device housing 14 Side wall of the device housing 15 Side wall end of the device housing 20 Light source 21 Heat sink 22 Heat dissipation fin 23 Cooling fan 24 Electrical parts 25 Section wall 30 Intake opening 40 Exhaust flow path 41 First opening 41D Opening width of first opening 42 Second opening 42D Opening width of second opening 42α Wind direction angle 43 Rectifying flow path 43D Rectification Flow path length of flow path 43S Flow path cross section 44 Wind guide 45 Partition 46 Peripheral surface 47 Square 50 Filter installation unit 51 First holding part 511 First support part 512 Engagement receiving part 513 Protrusion part 514 Holding end part 52 Second holding part 52a One end 52b Other end 521 Second support part 522 Engaging protrusion 53 Filter 53A Filter 53B Filter 531 Filter outer surface (filter intake surface)
532 Filter inner surface 60 Ink head 61 Ink ejector
P Ink mist W work SD Scanning direction 90 Light irradiation device 91 Light source unit 92 Light emission unit 93 Intake opening 94 Exhaust opening 94α Wind direction angle 95 Filter 96 Cooling fan 97 Heat sink

Claims (7)

In a light irradiation device having a light source unit in which a plurality of LEDs are arranged and a heat sink provided on the back surface side of the light source unit, and a cooling fan provided opposite to the heat sink.
The heat sink has a configuration in which a plurality of fins arranged side by side in one direction are provided with a gap, and cooling air from the cooling fan is circulated through the gap between the fins.
The heat sink is provided with a discharge flow path portion on the downstream side of the cooling air.
The discharge flow path portion includes a first opening that opens adjacent to the heat sink and a second opening that opens outside the housing, and communicates the first opening and the second opening. Equipped with a rectifying flow path
The rectifying flow path portion has a flow path length longer than the opening width of the first opening in the flow path direction, and extends in a direction away from the light source portion.
The light irradiation device, wherein the first opening and the second opening are formed in the circumferential direction of the rectifying flow path portion with respect to the flow path direction. The light irradiation device according to claim 1, wherein the second opening has a smaller opening area than the first opening. The light irradiation device according to claim 1, wherein a wind guide portion extending from the second opening in a direction of narrowing the flow path is provided in the vicinity of the second opening. The rectifying flow path portion has a long flow path cross section in a direction intersecting the flow path direction.
The light irradiation device according to claim 1, wherein the rectifying flow path portion is provided with a partition portion for dividing the cross section of the flow path in a long direction. The claim is characterized in that a plurality of unit units in which a light source unit and a cooling fan are paired are provided inside the housing, and the unit units are separated by a partition wall so that they do not communicate with each other. The light irradiation device according to 1. The light according to claim 1, wherein the intake opening of the housing is provided with a filter that projects to the outside of the housing so as to be separated from the intake opening while covering the intake opening. Irradiation device. The light irradiation device according to claim 6, wherein the filter is sandwiched between a first holding portion that abuts on the inside thereof and a second holding portion that abuts on the outside thereof.

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