JP6788499B2 - Light irradiation device - Google Patents

Description

The present invention relates to a light irradiation device.

As a conventional light irradiation device, Patent Document 1 includes a light source, a heat radiating body provided on the back surface side of the light source, a fan for sending air to the heat radiating body, and a case for accommodating the heat radiating body. Disclosed is composed of a plurality of heat radiating fins arranged at intervals from each other, and by applying a partition plate to a predetermined surface of the heat radiating body, the flow path of air flowing through the gap between the heat radiating fins is adjusted. Has been done.

However, in this light irradiation device, since it is necessary to separately prepare the partition plate and install it in the case, there is a problem that the weight of the entire device and the manufacturing cost increase. Further, in this type of light irradiation device, it is necessary to wire an electric wire for supplying electric power to the light source in the case, but the flow of air sent into the gap between the heat radiation fins is not obstructed. Wiring is very troublesome, and there is also a problem that the arrangement of the radiator and the fan in the case is restricted in order to secure the wiring space, and the size of the device itself becomes large accordingly. ..

Japanese Unexamined Patent Publication No. 2016-24917

Therefore, the present invention controls the flow of gas flowing through the gaps between the radiating fins without increasing the weight and manufacturing cost while eliminating unnecessary wiring space and making the light source more compact than the conventional one. The main issue is to improve the cooling efficiency.

That is, the light irradiation device according to the present invention includes a substrate in which the electric wire mounting region and the light source mounting region are set at different surface positions, a radiator having a plurality of heat radiation fins erected on the back surface of the substrate, and the above. A light source provided in the light source mounting area and an electric wire provided at one end in the electric wire mounting area and electrically connected to the light source are provided, and the plurality of heat radiating fins are spaced apart from each other in the gap. It is provided so that the gas flows, and one end side of the electric wire is wired from the surface side of the substrate to the heat radiation fin side, and the root side of the heat radiation fin is within the range of the outer shape of the heat radiation body. It is characterized in that it is crawled along the heat radiation fin from the tip side to the tip side.

In this way, wire one end side of the electric wire from the surface side of the substrate to the heat radiation fin side, and crawl along this from the base side to the tip side of the heat radiation fin within the range of the outer shape of the heat radiation body. For example, it is not necessary to intentionally provide a wiring space for the electric wire around the radiator, and the device can be made more compact than the case where the wire is wired while avoiding the radiator. The electric wire does not necessarily have to be wired in contact with the heat radiation fins, and the case where the electric wire is wired along the heat radiation fins with a slight distance is also included in the present invention. Further, the electric wire may be laid on the outer surface of the heat radiating body (heat radiating fin) or may be laid on the gap between the heat radiating fins.

Further, in the light irradiation device, it is preferable that the electric wire is wired along the outer surface of the radiator on the side opposite to the substrate side. In this way, it is more effective for securing the wiring space and wiring processing.

Further, in the light irradiation device, it is preferable that the electric wire is wired so as to avoid the portion of the heat radiation fin corresponding to the light source mounting region. By doing so, the flow of gas in the heat radiation fins (for example, the heat radiation fins located on the back surface side of the light source) in the portion corresponding to the light source mounting area is not obstructed by running the electric wire, so that the light source is used. Cooling efficiency does not decrease. In addition, it is also possible to control the flow of air around the heat radiation fins with a crawled electric wire, and the gas is surely passed through the heat radiation fins in the portion corresponding to the light source mounting area, that is, the heat radiation fin portion closest to the heat source. It is also possible to increase the cooling efficiency.

Further, in the light irradiation device, the substrate is formed with through holes penetrating through the front and back surfaces, or notches opening on the front and back surfaces and side surfaces, and the electric wire is formed through the through holes or the notch portions. It is preferable that the wiring is from the front surface side to the back surface side (the heat radiation fin side) of the substrate. In this way, the wiring process of the electric wire is made easier, it is not necessary to provide a wiring space for the electric wire around the radiator, and the device can be made more compact than when the electric wire is wired while avoiding the radiator. Can be done. Moreover, it is possible to prevent the electric wire from interfering with other members and being damaged.

Further, it is preferable that the light irradiation device further includes an air supply means for supplying gas to the gap between the heat radiation fins or an exhaust means for discharging gas from the gap between the heat radiation fins. In this way, the gas flow is forcibly generated in the gap between the heat radiating fins, and the heat generated by the light source can be radiated more efficiently.

As described above, according to the light irradiation device according to the present invention, the flow of gas flowing through the gaps between the heat radiating fins can be prevented without increasing the weight and manufacturing cost while eliminating unnecessary wiring space and reducing the size. It can be controlled to increase the cooling efficiency of the light source.

It is sectional drawing which showed the schematic structure of the light irradiation apparatus which concerns on this embodiment. It is sectional drawing in the direction of arrow AA in FIG. It is an exploded perspective view which showed the light source unit of this embodiment. It is a perspective view of the light source unit of this embodiment as seen from the light source side. It is a perspective view of the light source unit of this embodiment as seen from the heat radiation fin side. It is an external perspective view which showed the light irradiation apparatus of this embodiment. It is a perspective view which showed the light source unit of another embodiment. It is a perspective view which showed the light source unit of another embodiment. It is a perspective view which showed the light source unit of another embodiment. It is a perspective view which showed the light source unit of another embodiment.

Hereinafter, the light irradiation device according to the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the light irradiation device 100 according to the present embodiment includes three light source unit PUs having the same structure, three fan FNs (exhaust means), and a case CA accommodating them. As shown in FIGS. 3 to 5, the light source unit PU includes a light source 10 composed of a plurality of LEDs 11, a heat radiating body 40 to which the light source 10 is attached, and an electric wire electrically connected to the LED 11. It has 60 and.

The light source 10 is provided on a metal substrate 20 having a rectangular shape and excellent thermal conductivity. On the surface of the substrate 20, a light source mounting region 21a (indicated by a single point chain line in FIG. 3) is set in the center of the width direction (Y direction) from one end side to the other end side in the length direction (X direction). The other part is set as the electric wire attachment area 21b, and a plurality of LEDs 11 are attached in a plurality of rows in the width direction along the length direction in the light source attachment area 21a. Of these, board terminals 50 to which the electric wires 60 are connected are attached to the portions corresponding to the four corners of the board 20. Examples of the LED 11 include those that emit visible light, ultraviolet light, infrared light, and the like, but the type of emitted light is not limited at all.

The heat radiating body 40 is composed of a rectangular plate-shaped base plate 30 on which the substrate 20 is attached to the front surface and a plurality of heat radiating fins 41 erected on the back surface of the base plate 30, and is made of a metal having excellent thermal conductivity. ing. The base plate 30 and the substrate 20 are formed in the same shape, both ends in the Y direction are recessed in the X direction, and steps 22 and 31 are formed at the center (the portion corresponding to the light source mounting area 21a) and the end in the Y direction. It has become. The heat radiating fins 41 are composed of flat plate-shaped members along the Y direction and are provided in parallel with an interval in the X direction so that air flows through the gaps between the heat radiating fins 41. Further, the heat radiation fins 41 have a low height at both ends in the Y direction, and have a shape in which a step 42 is formed in the X direction at the center (the portion corresponding to the light source mounting region 21a) and the end in the Y direction. The base plate 30 and the substrate 20 correspond to the substrate in the claims, and the steps 22 and 31 correspond to the notches in the claims.

The electric wire 60 is a flexible planar or flat electric wire in which a plurality of lead wires are bundled. One end of the electric wire 60 is provided with a first terminal 61 connected to the board terminal 50, and the other end of the electric wire 60 is connected to a power supply terminal 70 provided in the case CA as shown in FIG. A second terminal 62 is provided. Each board terminal 50 is formed with a connection port 51 that opens toward the corresponding step 31 side.

As shown in FIGS. 1, 2 and 6, the case CA is formed in a rectangular parallelepiped shape, and a rectangular light emission port 71 is provided on a predetermined surface of the case CA, and the opposite surface of the predetermined surface is provided. Is provided with three exhaust ports 72 for exhausting air to the outside of the case CA. Further, on both side surfaces of the case CA, three intake ports 73 for taking in air into the case CA are provided.

Then, to explain the accommodation state of the three light source unit PUs and the three fan FNs with respect to the case CA, the three light source unit PUs are arranged in series in the X direction as shown in FIGS. 1, 2 and 6 in the case CA. The light source 10, the substrate 20, the base plate 30, the heat radiation fin 41, and the step 42 at the tip of the heat radiation fin 41 are continuous. Further, the light source unit PU is installed in the case CA so that the light from the light source 10 is emitted to the outside from the light emission port 71, and the heat radiating body 40 faces the corresponding exhaust port 72 and the heat radiating fin 41. The gap between them is arranged to face the corresponding intake port 73. On the other hand, the fan FN is installed between the tip of the heat radiation fin 41 and the exhaust port 72, and is configured to exhaust the air in the case CA to the outside.

Next, the wiring of the electric wire 60 in the case CA will be described. The electric wire 60 connected to the substrate terminal 50 of the light source unit PU passes through the corresponding steps 22 and 31 and turns from the front surface side to the back surface side of the substrate 20. Then, after being crawled along the heat radiation fin 41 from the base side to the tip side of the heat radiation fin 41, it was guided along the step 42 at the tip of the heat radiation fin 41 and provided on one side in the X direction in the case CA. It is connected to the power supply terminal 70 or the power supply terminal 70 provided on the other side.

A guide plate 74 is installed in the case CA so as to face the step 42, and the guide plate 74 prevents the electric wire 60 from being caught in the fan FN. Further, although not particularly shown, a fixing member for fixing the light source unit PU and the fan FN is appropriately provided in the case CA, and a fastener or the like for preventing the electric wire 60 from bending is appropriately provided. It is provided. Further, the electric wire 60 may be wired not only in contact with the heat radiating fins 41 but also along the heat radiating fins 41 at a slight distance.

As described above, according to the light irradiation device 100 of the present embodiment, air is taken into the case CA from the intake port 73 by the fan FN, and the taken-in air passes through the gap between the heat radiation fins 41. Although the air is exhausted from the exhaust port 72 (see the arrows in FIGS. 2 and 5), the cooling efficiency of the light source 10 is not lowered by the wiring of the electric wire 60. That is, air flows into the gap between the heat radiation fins 41 from the side surface of the heat radiation fins 41 and flows out from the tip side of the heat radiation fins 41, but the electric wire 60 does not obstruct the air flow when looking at the air inflow side. Since it is wired along the position (because it is wired along the heat radiation fin 41 located at the end in the X direction and then in the X direction along the tip of the heat radiation fin 41), the cooling efficiency is increased. Does not decrease.

On the other hand, regarding the air outflow side, the electric wire 60 is wired along the step 42 while avoiding the portion of the heat radiation fin 41 corresponding to the light source mounting region 21a (the portion located on the back surface side of the light source 10). Since the gap between the heat radiation fins 41 is closed by the electric wire 60 and it becomes difficult for air to flow out from the step 42 portion, the air is the portion of the heat radiation fin 41 corresponding to the light source mounting area 21a ( It flows out from the tip side of the light source 10 (the portion located on the back surface side). As a result, the air flow is controlled so that the air passes through the portion of the heat radiation fin 41 closest to the heat source (light source 10), and the cooling efficiency can be further improved.

Further, the electric wire 60 was wired from the surface side of the substrate 20 to the heat radiation fin 41 side, and crawls along the heat radiation fin 41 from the root side to the tip side of the heat radiation fin 41, and crawls along the heat radiation fin 41. Since the entire portion is opposed to the heat radiation fin 41 (that is, the electric wire 60 is wired within the range of the outer shape of the heat radiation body 40), it is necessary to intentionally provide a wiring space for the electric wire 60 around the heat radiation body 40. Therefore, the device 100 can be made more compact than the case where the electric wire 60 is wired while avoiding the radiator 40. Further, since the electric wire 60 is wired from the front surface side to the back surface side of the substrate 20 through the steps 22 and 31, it is more effective for securing the wiring space and the wiring process, and further, the step 42 at the tip of the heat radiation fin 41. By wiring the electric wire 60 along the wire 60, it is possible to simplify the wiring process of the electric wire 60 and prevent the electric wire 60 from interfering with other members and being damaged.

Further, since the opening directions of the board terminal 50 and the connection port 51 are provided parallel to the surface of the board 20, and the electric wire 60 can be wired along the surface of the board 20, the light emission port 71 of the case CA is provided. The light source unit PU can be arranged close to the surface. This also makes it possible to further make the device 100 more compact.

As a modification of the light source unit PU in the above embodiment, there is one shown in FIG. In this light source unit PU, heat radiation fins 41 are provided in parallel with an interval in the Y direction, and are located at the center (the portion corresponding to the light source mounting area 21a) in the Y direction and at the end. The fin height is different from that of the one, and a step 42 is generated. Even if such light source units PUs are arranged in the X direction, the same effect as described above can be obtained. The case CA may be provided with an intake port 73 at a position corresponding to the lateral side of the heat radiation fin 41 of the light source unit PU.

Further, as another modification of the light source unit PU in the above embodiment, there is one shown in FIG. In this light source unit PU, a plurality of heat radiation fins 41 are provided in parallel with the substrate 20 and the base plate 30, and one end side of the electric wire 60 is wired from the surface side of the substrate 20 to the heat radiation fin 41 side, and each of them. A configuration in which the entire width of a portion that is laid along the tip of the heat radiating fin 41 and is laid along the tip of each heat radiating fin 41 faces the tip of each heat radiating fin 41, in other words, the electric wire 60. One end side of the substrate 20 is wired from the surface side of the substrate 20 to the heat radiation fin 41 side, and is laid along the tip of each heat radiation fin 41 within the range of the outer shape of the heat radiation body 40. It has become. Further, the electric wire 60 is wired along the outer surface of the heat radiating fin 41 farthest from the substrate 20 among the plurality of heat radiating fins 41, in other words, on the outer surface of the radiator 40 opposite to the board 20 side. It is configured to be wired along the board, and the electric wire 60 is configured to avoid the portion corresponding to the light source mounting area 21a of the heat radiation fin 41 farthest from the substrate 20. The light source mounting area 21a is set in the center of the substrate 20, and the light source 10 is provided in the center. Even with such a light source unit PU, the same effect as described above can be obtained.

Further, for example, as shown in FIG. 9, notches 22a and 31a that are open on both the front and back surfaces and the side surfaces of the substrate 20 and the base plate 30 are provided in portions that do not correspond to the light source mounting area 21a, and the notches are provided. The electric wire 60 may be wired from the front surface side of the substrate 20 to the back surface side of the base plate 30 through the portions 22a and 31a. Further, as shown in FIG. 10, through holes 22b and 31b penetrating both the front and back surfaces of the substrate 20 and the base plate 30 are provided in a portion not corresponding to the light source mounting area 21a, and the substrate is passed through the through holes 22b and 31b. The electric wire 60 may be wired from the front surface side of the 20 to the back surface side of the base plate 30. In FIG. 10, the linear electric wire 60 is used, but a planar or flat electric wire 60 may be used.

Further, in the above embodiment, the heat radiation fin 41 has a plate shape, but the present invention is not limited to this, and may be, for example, a pin shape. Further, the shape of the heat radiating body 40, the installation position of the light source 10, and the like are not limited to the above.

In addition, in the above-described embodiment, the fan FN is provided to configure the light irradiation device 100, but the fan FN may be omitted. Further, although the fan FN is used as an exhaust fan, it may be used as an air supply fan (air supply means) for supplying air into the case CA. Further, the exhaust and air supply mechanisms are not limited to fans, and other mechanisms may be adopted.

100 Light irradiation device PU Light source unit FN fan CA Case 10 Light source 20 Board 30 Base plate 40 Heat radiator 41 Heat dissipation fin 50 Board terminal 60 Electric wire

Claims (5)

A heat radiating body having a substrate of a wire attachment region and the light source mounting region is set to a different surface location and a plurality of radiation fins provided on the back side of the substrate,
The light source provided in the light source mounting area and
A light source unit having one end provided in the electric wire mounting area and having an electric wire electrically connected to the light source is provided.
A plurality of the light source units are arranged in series and connected to each other.
The plurality of heat radiation fins stand up from the back side of the substrate at intervals from each other , and are provided so that gas flows in the gaps thereof.
One end of the electric wire is wired from the surface side of the substrate to the heat radiating fin side, and, along the surface facing the alignment direction of the light source unit of heat radiation fins attached roots or al destination Tanma of heat radiation fins A light irradiation device characterized in that the entire portion laid flat along the heat radiating fin is along the outer surface of the heat radiating body or the gap . The electric wire further has a portion flatly laid along the tips of the plurality of heat radiation fins, and the portion is wired so as to avoid a portion of the plurality of heat radiation fins corresponding to the light source mounting region. The light irradiation device according to claim 1, which extends in the arrangement direction of the light source units . The radiating fins are arranged in parallel with each other.
The light irradiation device according to claim 1 or 2, wherein the light source units are arranged in series so that the heat radiation fins of the heat radiation bodies are arranged in parallel . The substrate is formed with through holes penetrating the front and back surfaces or notches opening on the front and back surfaces and side surfaces.
The light irradiation device according to any one of claims 1 to 3 , wherein the electric wire is wired from the front surface side to the back surface side of the substrate through the through hole or the notch portion. The light irradiation device according to any one of claims 1 to 4 , further comprising an air supply means for supplying gas to the gap between the heat radiation fins or an exhaust means for discharging gas from the gap between the heat radiation fins.