Light source unit, light source device, and method for forming a light source unit

Abstract

To provide a light source unit having improved illuminance uniformity.SOLUTION: A light source unit includes a plurality of light source devices connected to each other. The plurality of light source devices each comprise: a baseboard on which a plurality of solid light sources are arranged; a joining surface joined to the baseboard; a connection connected to the other light source devices; a heat radiator including heat radiation fins for radiating the heat of the baseboard; a housing having a first opening for passage of gas near the heat radiation fins and accommodating the heat radiation fins; and a fan for passage of gas outside of the housing to the heat radiator. A clearance for passage of the gas is formed between the first openings, which are positioned between the different light source devices opposite each other.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a light source unit, a light source device, and a method for forming a light source unit.

Background Art

[0002] In recent years, light source devices using light sources such as LEDs have been used for curing printing inks and curing adhesives for bonding display substrates. The sizes and shapes of printing papers and display substrates are diverse. Therefore, a light source unit in which a plurality of light source devices are connected is known so that the irradiation area can be flexibly changed according to the sizes and shapes of irradiation objects such as printing papers and display substrates.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Improvement in the illuminance uniformity of the irradiation area of the light source unit is expected from the market. An object of the present invention is to provide a light source unit with improved illuminance uniformity, a light source device included in the light source unit, and a method for forming a light source unit.

Means for Solving the Problems

[0005] The light source unit is a light source unit in which a plurality of light source devices are connected, Each of the plurality of light source devices includes a substrate on which a plurality of solid light sources are arranged, A heat sink including a bonding surface bonded to the substrate, a connecting portion connected to another light source device, and heat sinks with heat dissipation fins for dissipating heat from the substrate, A housing having a first opening for circulating gas near the heat dissipation fins and housing the heat dissipation fins, The system includes a fan that circulates the gas through the heat dissipation fins, There is a gap between the first openings, which are positioned opposite each other between different light source devices, for circulating the gas.

[0006] The inventors focused on the fact that temperature variations in substrates between connected light source devices affect the light output between the connected light source devices, and devised the above light source unit. As will be described in detail later, in the light source unit, cooling gas can be supplied to each of the connected light source devices through the gap between the first apertures which are arranged opposite each other between different light source devices. As a result, heat from the substrate can be effectively dissipated in any of the light source devices constituting the light source unit, and temperature variations in the substrates between the connected light source devices can be reduced. Thus, variations in light output between light source devices are suppressed, and the uniformity of illuminance in the irradiation area of ​​the light source unit is improved.

[0007] In this specification, a heat sink is a component that is joined to a substrate on which multiple solid light sources are arranged, and that receives and dissipates heat from the substrate. In this specification, if heat transfer materials such as a heat conductive plate, a heat conductive sheet, and a heat conductive grease are present between the substrate and the heat sink body, these heat transfer materials are considered to be components constituting the heat sink.

[0008] The light source device of the present invention comprises a substrate on which a plurality of solid-state light sources are arranged, A heat sink including a bonding surface bonded to the substrate, a connecting portion for connecting to other light source devices, and heat dissipation fins for dissipating heat from the substrate, A housing for the aforementioned heat sink, The enclosure comprises a fan that circulates the gas outside the enclosure to the heat dissipation fins, The housing has a first opening on its side surface for circulating the gas near the heat dissipation fins, and the first opening is located inside the connecting portion.

[0009] When a light source device located inside the connecting portion is connected, the first opening is positioned opposite the first opening of the other connected light source device. Since the first opening is located inside the connecting portion, a gap for the gas to circulate is formed between the two opposing first openings. As a result, temperature variations in the substrate between connected light source devices are reduced. Consequently, variations in light output between light source devices are suppressed, and the uniformity of illuminance in the irradiation area of ​​the light source unit is improved.

[0010] The heat dissipation fins include a plate material, and the plate material may extend in a direction intersecting the side surface having the opening.

[0011] The housing may have the first opening on at least one side of the housing. However, the housing may also have the first opening near the heat dissipation fins on each of two opposing sides of the housing. Furthermore, the housing may have the first opening on each of the four sides of the housing.

[0012] At least one of the light source devices may further include a power supply connector bonded to the substrate, avoiding the heat sink bonded to the substrate. At least one of the multiple light source devices, or the light source device, may include multiple power supply connectors.

[0013] In at least one of the aforementioned light source devices, The plurality of solid light sources are arranged along a first direction and a second direction perpendicular to the first direction, the arrangement pitch in the first direction is greater than the arrangement pitch in the second direction, and at least two of the plurality of power supply connectors may overlap in the first direction. The arrangement pitch in the first direction may be the same as the arrangement pitch in the second direction.

[0014] At least one of the light source devices may be provided with a wind shielding portion in the housing that suppresses mixing of the gas flowing into the housing and the gas discharged from the housing.

[0015] At least one of the light source devices may have a light transmissive portion on the light emitting side of the plurality of solid light sources. The light transmissive portion may be a member disposed across a plurality of light source devices. The light transmissive portion may be a member disposed for each of the light source devices.

[0016] At least one of the light source devices each has the light transmissive portion and a support portion that supports the light transmissive portion, and at least a part of the support portion, particularly the region where the emitted light from the plurality of solid light sources is incident, may have a light reflection function.

[0017] The method for forming the light source unit includes preparing a plurality of the light source devices, using the connecting portion to connect the plurality of light source devices to each other, and forming a light source unit in which the plurality of light source devices are connected.

Advantages of the Invention

[0018] [[ID=二十二]]It is possible to provide a light source unit with improved illuminance uniformity in an irradiation area formed by connecting light source devices, a light source device included in the light source unit, and a method for forming the light source unit.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view of the light source unit of the first embodiment. [Figure 2] It is a cross-sectional view in the XZ plane of the light source unit shown in FIG. 1. [Figure 3] It shows a view of the substrate seen from the light emitting side of one light source device. [Figure 4] It is a partially enlarged cross-sectional view taken along the line segment D-D in FIG. 3. [[ID=四十]] [Figure 5] It is a cross-sectional view of the light source unit of the second embodiment. [Figure 6] This is a cross-sectional view of the light source unit of the third embodiment. [Figure 7] This is a perspective view of the light source unit of the fourth embodiment. [Figure 8] This is a cross-sectional view of the light source unit of the fourth embodiment. [Modes for carrying out the invention]

[0020] Each embodiment of the light source unit will be described with reference to the drawings. It should be noted that the drawings disclosed herein are for illustrative purposes only. That is, the dimensional ratios in the drawings do not necessarily correspond to the actual dimensional ratios, nor do the dimensional ratios necessarily correspond between the drawings.

[0021] The drawings are described with reference to the XYZ coordinate system. In this specification, when directions are expressed, positive and negative directions are distinguished and indicated with a sign, such as "+X direction" and "-X direction". When directions are expressed without distinguishing between positive and negative directions, they are simply described as "X direction". In other words, in this specification, when simply described as "X direction", both "+X direction" and "-X direction" are included. The same applies to the Y direction and Z direction.

[0022] <First Embodiment> [Overall structure] A first embodiment of the light source unit will be described with reference to Figures 1 and 2. Figure 1 is a perspective view of the light source unit 100. As shown in Figure 1, the light source unit 100 has a plurality of light source devices 20, which are arranged in two rows along the X-axis and three rows along the Y-axis. The number of light source devices 20 in the light source unit 100 is not particularly limited. For example, the light source unit 100 may have 36 light source devices 20, arranged in six rows along the X-axis and six rows along the Y-axis. The plurality of light source devices 20 are connected to each other using the connecting parts of a heat sink, which will be described later. The light from the light source unit 100 is emitted in the -Z direction.

[0023] Figure 2 is a cross-sectional view of the light source unit 100 shown in Figure 1 in the XZ plane. Figure 2 shows cross-sections of two light source devices 20 arranged in the X direction. As shown in Figure 2, each light source device 20 includes a substrate 2 on which a plurality of solid light sources 1 (not shown in Figure 2; see Figure 3 or Figure 4) are arranged, a heat sink 3 bonded to the substrate 2, a housing 4 housing the heat sink 3, and a fan 5 for circulating gas from outside the housing 4 to the heat sink 3. Note that in Figure 2, power lines connected to the substrate 2 and fan 5, the control unit of the light source device 20, and connectors for electrically connecting the outside and inside of the housing 4 are omitted.

[0024] The heat sink 3 includes a main body 3a that is joined to the substrate 2, a connecting portion 3b for connecting to other light source devices 20, and heat dissipation fins 3c for dissipating heat from the substrate 2. The main body 3a has a bonding surface 3s that is joined to the substrate 2. In this embodiment, the heat dissipation fins 3c provided by each light source device 20 are composed of a plurality of plate materials arranged in the Y direction. Each plate material extends along the XZ plane.

[0025] The connecting portion 3b will now be described. When connecting a light source device 20 to another light source device 20, the connecting portion 3b is used to connect the main body 3a of the light source device 20 to the main body 3a of the other light source device 20 to be connected. In this embodiment, the connecting portion 3b consists of a screw hole and a screw. The main body 3a of the light source device 20 and the main body 3a of the other light source device 20 to be connected each have a screw hole, and they can be connected by attaching a screw such as a nipple to each screw hole. However, the connecting portion 3b is not limited to this. For example, the connecting portion 3b may have a structure in which adjacent main bodies 3a interlock with each other. The connecting portion 3b may also be a formwork that bundles and fastens multiple light source devices 20 together.

[0026] The housing 4 has two types of openings for circulating gas inside and outside the housing 4. One is a first opening (4h, 4i) located on the side of the housing 4. The other is a second opening 4j located on the top surface of the housing 4 (the surface located furthest to the +Z side). The gas to be circulated is the gas contained in the environment in which the light source unit 100 is placed. The "gas contained in the environment" is usually air. However, the light source unit 100 itself may be placed in an inert gas atmosphere such as nitrogen gas, in which case the "gas contained in the environment" will be an inert gas.

[0027] The first opening (4h,4i) is located near the heat dissipation fin 3c. Because the first opening (4h,4i) is located near the heat dissipation fin 3c, the gas flowing in from the first opening (4h,4i) can be immediately brought into contact with the heat dissipation fin 3c. The plate material constituting the heat dissipation fin 3c extends in a direction intersecting the side surface of the housing 4 having the first opening (4h,4i). In this embodiment, the plate material constituting the heat dissipation fin 3c extends in the X direction, and the side surface having the first opening (4h,4i) extends in the YZ plane. Therefore, the heat dissipation fin 3c and the first opening (4h,4i) intersect at a right angle.

[0028] In this embodiment, each of the two opposing sides has a first opening (4h, 4i). Specifically, of the two sides that are arranged opposite each other with a heat dissipation fin 3c in between, the first opening 4h is located on one side and the first opening 4i is located on the other side. The first opening 4h faces the outer circumference of the connected light source devices 20. The first opening 4i is located inside the connected light source devices 20. The first opening 4i of one light source device 20 is arranged opposite to the first opening 4i of a different light source device 20. There is no structural difference between the first opening 4h and the first opening 4i. Depending on how the light source devices 20 are arranged, it is determined whether the opening is the first opening 4h that is in contact with the outer circumference of the connected light source devices 20, or the first opening 4i that is located inside the connected light source devices 20.

[0029] The light source device 20 has at least one first opening (4h, 4i) and a second opening 4j for circulating gas inside. It is preferable to provide the first opening (4h, 4i) on each of two opposing sides within a single light source device 20. This increases the amount of gas flowing into the light source device 20, thereby improving the cooling efficiency of the light source device 20.

[0030] When three or more light source devices 20 are arranged in one direction, there will be light source devices 20 that are not located at the ends of the light source unit 100 (i.e., light source devices 20 sandwiched between other light source devices 20). In order for the "light source devices 20 not located at the ends" to circulate gas inside the housing 4, it is particularly preferable to provide first openings (4h, 4i) on each of the two opposing sides.

[0031] Figure 1 shows that the first opening 4h is composed of a single opening. Figure 1 also shows that the second opening 4j is composed of multiple small openings, each consisting of a large single opening separated by a grid. The characteristics of the shapes of the first opening 4h and the second opening 4j are merely illustrative. The characteristics of the shapes of the openings in the first opening (4h, 4i) and the second opening 4j, the size of each opening, and the number of openings are not particularly limited.

[0032] As shown in Figure 2, for the sake of explanation, the gases are distinguished and represented as gas G1, gas G2, and gas G3 depending on where they flow. Naturally, the gases (G1, G2, G3) are of the same type. The fan 5 in this embodiment creates a gas flow by drawing in the gas near the heat dissipation fins 3c. The gas flow is such that gas G1 from outside the housing 4 is drawn in through the first opening (4h, 4i), the incoming gas G2 is sent out in the +Z direction, and gas G3 is released outside the housing 4 through the second opening 4j. The cold gas G2 from outside the housing 4 comes into contact with the heat dissipation fins 3c, and the heat dissipation fins 3c are cooled.

[0033] In the light source device 20 of this embodiment, the first opening (4h, 4i) is an intake port, and the second opening 4j is an exhaust port. As a modification, the fan 5 may be designed so that the second opening 4j becomes an intake port and the first opening (4h, 4i) becomes an exhaust port.

[0034] The light source unit 100 has a gap C1 (see Figure 2) for circulating gas between first openings 4i which are arranged opposite each other between different light source devices. When viewed as a standalone light source device 20, the gap C1 is formed because the first opening 4i is located inside the connecting portion 3b. Gas outside the light source unit 100 flows into the interior of the housing 4 through the gap C1 and the first opening 4i. In the light source unit 100, the first opening 4h facing the outer circumference of the connected light source device 20 allows gas G1 to flow into the housing 4 without passing through the gap C1.

[0035] The dimensions of the gap C1, the first opening (4h, 4i), and the second opening 4j are parameters related to the gas conductance. These parameters and the output of the fan 5 can be designed based on the desired intake volume. Each light source device 20 constituting the light source unit 100 may have the same parameters and the output of the fan 5. Alternatively, the parameters and the output of the fan 5 may be individually set for each light source device 20 constituting the light source unit 100 based on the illuminance distribution or temperature distribution of each light source device 20.

[0036] [Solid-state light source and substrate] Figure 3 shows a view of the substrate 2 from the emission side (-Z side) of one light source device 20. Figure 3 does not show the light-transmitting portion 11 and the support portion 12, which will be described later. Multiple solid light sources 1 are arranged in the X and Y directions on the main surface of the substrate 2 on the -Z side. In this embodiment, the solid light sources 1 are LEDs that emit ultraviolet light.

[0037] The solid-state light source 1 does not have to be an LED. For example, a semiconductor laser element may be used as the solid-state light source 1. The emission wavelength of the solid-state light source 1 in this embodiment is, for example, 250 nm to 450 nm. The emission wavelength of the solid-state light source 1 does not have to be in the ultraviolet region.

[0038] The number of solid-state light sources 1 on a single substrate 2 is not particularly limited, but for example, it is often 100 or more, preferably 200 or more, often 800 or less, and preferably 500 or less.

[0039] In this embodiment, the solid-state light source 1 is a bare chip product (a product in which LED elements are simply placed on a substrate and are not covered with protective material). The solid-state light source 1 may also be a packaged product (a product in which the LED elements are covered with protective material).

[0040] The dimensions of substrate 2 are preferably 50 mm or more in each X / Y direction, and more preferably 80 mm or more. The dimensions of substrate 2 are preferably 150 mm or less in each X / Y direction, and more preferably 120 mm or less.

[0041] The solid-state light sources 1 are arranged at a constant pitch in one direction. In the solid-state light sources 1 of this embodiment, the arrangement pitch P1 in the X direction is greater than the arrangement pitch P2 in the Y direction. For example, the arrangement pitch P1 in the X direction is often 1.1 times or more than the arrangement pitch in the Y direction, and more preferably 1.3 times or more. The arrangement pitch P1 in the X direction is often 2 times or less than the arrangement pitch in the Y direction, and more preferably 1.7 times or less. The solid-state light sources 1 are sparsely arranged in the X direction and densely arranged in the Y direction. Note that the arrangement pitch P1 in the X direction and the arrangement pitch P2 in the Y direction may be substantially the same (for example, the difference in pitch is 5% or less).

[0042] [Radiator] Figure 4 is a partially enlarged cross-sectional view of the line segment DD in Figure 3. As shown in Figure 4, the main surface of the substrate 2, which is the +Z side, has the main body 3a of the heat sink 3, a power supply connector 7, and a temperature sensor 8. Power lines 9 are connected to the power supply connector 7 and the temperature sensor 8, respectively. The power lines 9 transmit electrical energy or electrical signals.

[0043] In Figure 3, the bonding surface 3s of the heat sink body 3a, the power supply connector 7, and the temperature sensor 8 are shown by dashed lines. The bonding surface 3s occupies most of the area on the back surface of the substrate 2 (for example, more than 90% of the area on the back surface of the substrate). This allows the substrate 2 to dissipate heat effectively. In Figure 3, the size of the bonding surface 3s is shown to be slightly smaller than the size of the substrate 2, but the size of the bonding surface 3s and the size of the substrate 2 may be the same. The size of the bonding surface 3s may also be slightly larger than the size of the substrate 2. The power supply connector 7 and the temperature sensor 8 are bonded to the back surface of the substrate 2, avoiding the bonding surface 3s of the heat sink body 3a.

[0044] In this embodiment, the light source device 20 is equipped with multiple power supply connectors 7 for supplying power to each solid light source 1. By distributing the multiple power supply connectors 7 on the substrate 2, the amount of current supplied by each power supply connector 7 can be reduced, thereby reducing the amount of heat generated by the substrate 2 near the power supply connectors 7. As a result, the decrease in illuminance of the solid light source 1 due to temperature rise can be suppressed, and the uniformity of illuminance can be improved. However, such distributed arrangement of power supply connectors 7 is not essential, and there may be only one power supply connector 7.

[0045] Each of the multiple power supply connectors 7 is bonded to the back surface of the substrate 2, avoiding the main body 3a of the heat sink 3 which is bonded to the back surface of the substrate 2. In this embodiment, three power supply connectors 7 are connected to the back surface of the substrate 2. Preferably, the number of solid light sources 1 that overlap with the power supply connectors 7 in the X direction is greater than the number of solid light sources 1 that overlap with the power supply connectors 7 in the Y direction. In this embodiment, each power supply connector 7 is arranged such that its longitudinal direction is aligned with the X direction. As a result, the power supply connectors 7 overlap with multiple solid light sources 1 in the X direction and with one solid light source 1 in the Y direction.

[0046] The Y direction is the direction in which the solid light sources 1 are arranged more densely than in the X direction (hereinafter, the "Y direction" may be referred to as the "dense direction"). The X direction is the direction in which the solid light sources 1 are arranged more sparsely than in the Y direction (hereinafter, the "X direction" may be referred to as the "sparse direction"). Furthermore, the location where the power supply connector 7 is located is a location where the body 3a of the heat sink 3 cannot be placed, making it prone to temperature rise. As a result, the area on the substrate 2 that is not in contact with the body 3a of the heat sink 3 is made longer in the sparse direction and shorter in the dense direction, thereby suppressing the temperature rise of the substrate 2 due to the solid light sources 1.

[0047] As shown in Figure 3, the power supply connectors 7 should not overlap with each other in the dense direction. In the dense direction, the area where the main body 3a of the heat sink 3 cannot be placed is shortened. This suppresses the temperature rise of the solid light source 1. In Figure 3, the power supply connectors 7 overlap with each other in the sparse direction. However, it is also acceptable to arrange the power supply connectors 7 so that they do not overlap with each other in the sparse direction.

[0048] As described above, in this embodiment, the solid light sources 1 are arranged at a constant pitch in one direction, but they do not necessarily have to be arranged at a constant pitch in one direction. The pitch of the solid light sources 1 may be increased (sparsely arranged) in areas of the substrate 2 that are not in contact with the main body 3a of the heat sink 3. Also, the arrangement pitch of the solid light sources 1 in the X direction and the arrangement pitch in the Y direction may be the same.

[0049] [fan] Various types of fans can be used for fan 5. For example, a propeller fan, a centrifugal fan, a turbo fan, or other fans may be used. In this embodiment, an axial flow cooling fan is used. In this embodiment, fan 5 is located inside the housing 4, but a fan located outside the housing 4 may also be used. The rotational speed of fan 5 is often, for example, 5,000 rpm or more, and more preferably 10,000 rpm or more. The rotational speed of fan 5 is often, for example, 30,000 rpm or less, and more preferably 20,000 rpm or less.

[0050] The rotational speed of fan 5 may be the same among the light source devices 20, or it may be intentionally made different. The rotational speed of fan 5 in light source devices 20 with relatively low gas conductance may be higher than the rotational speed of fan 5 in light source devices 20 with relatively high gas conductance. Furthermore, the rotational speed of fan 5 may be controlled according to the temperature detected by the temperature sensor 8.

[0051] [Temperature sensor] The temperature sensor 8 shown in Figure 4 is a sensor for measuring the temperature of the substrate 2. The temperature sensor 8 may be a thermocouple or a resistance thermometer.

[0052] [Support section and light-transmitting section] As shown in Figures 2 and 4, the light source unit 100 has a light-transmitting portion 11 on the light-emitting side (-Z side) of the substrate 2. The light-transmitting portion 11 is a cover that protects the solid light source 1 and the substrate 2. The light-transmitting portion 11 transmits light emitted from the solid light source 1. The light-transmitting portion 11 is supported by a support portion 12. In this embodiment, the light-transmitting portion 11 is a shared member that spans multiple light source devices 20.

[0053] In this embodiment, the inner surface 12s (see Figure 4) of the support portion 12 has a light-reflecting function that reflects light emitted from the solid-state light source 1. The specular reflectance of the inner surface 12s is preferably 50% or more, more preferably 60% or more, and more preferably 70% or more. Although an aluminum-based material may be used for the support portion 12, the material of the support portion 12 is not particularly limited. The light-reflecting function may be formed, for example, by mirror polishing the inner surface 12s, or by forming a reflective coating layer on the inner surface 12s.

[0054] <Second Embodiment> The light source unit of the second embodiment will be described. The explanation will focus on the differences from the light source unit of the first embodiment. Matters not described below have the same characteristics as the light source unit of the first embodiment. Similarly, for the third embodiment and subsequent embodiments, matters that have the same characteristics as the previously described light source units will be omitted from the explanation.

[0055] Figure 5 is a cross-sectional view of the light source unit 200 of the second embodiment. The light source unit 200 has a plurality of light source devices 20. Each light source device 20 has a windbreak section 22. The windbreak section 22 is positioned between the housing 4 and the housing 4 of the adjacent light source device 20. The function of the windbreak section 22 will be explained by comparing Figure 2 and Figure 5. As shown in Figure 2, the gas flowing into the gap C1 includes not only gas G1 flowing in from a relatively similar height, but also gas G1x flowing in from near the second opening 4j. There is a risk that gas G1x may contain relatively high-temperature gas G3 that has already passed through the inside of the light source device 20.

[0056] Therefore, as shown in Figure 5, a windbreak section 22 that blocks the flow path of gas G1x is placed in the flow path of gas G1x to prevent the gas near the second opening 4j from flowing into the gap C1 between the first openings 4i. This prevents the relatively high-temperature gas G3 that has already passed inside the light source device 20 from mixing with the gas G1 that flows back into the light source device 20. Since the temperature of the gas G1 flowing into the housing 4 can be reduced, the cooling efficiency is improved.

[0057] Preferably, the windbreak section 22 obstructs the flow of gas in the Z direction but does not obstruct the flow of gas in the Y direction. Even when the windbreak section 22 is provided, gas G1 having a flow in the Y direction can be allowed to flow in from the first opening 4i through the gap C1 between the first openings 4i.

[0058] In the light source device 20 of the second embodiment, each light source device 20 has its own light-transmitting section 11. Each light-transmitting section 11 is supported by its own support section 12. Thus, it is not necessary for each light source device 20 to have a shared light-transmitting section 11.

[0059] <Third Embodiment> Figure 6 is a cross-sectional view of the light source unit 300 of the third embodiment. The light source unit 300 has a plurality of light source devices 30. The housing 4 of the light source device 30 protrudes near the second opening 4j so as to be in contact with the housing 4 of the adjacent light source device 30. As a result, the housing 4 blocks the flow path of the gas G1x (see Figure 2) flowing in from near the second opening 4j, even without placing a windbreak portion 22 on the outer circumference of the housing 4.

[0060] <Fourth Embodiment> Figure 7 is a perspective view of the light source unit 400 of the fourth embodiment. Figure 8 is a cross-sectional view of the light source unit 400. The light source unit 400 has a plurality of light source devices 40. Each light source device 40 has first openings (4h, 4i) on all four sides of the housing 4. The light source device 40 also has strip-shaped heat dissipation fins 3c. The strip-shaped heat dissipation fins 3c can come into contact with gas flowing in from the X and Y directions. The heat dissipation fins 3c may be columnar or needle-shaped.

[0061] The first opening 4i exists not only between housings 4 facing each other in the X direction, but also between housings 4 facing each other in the Y direction. Therefore, gas G1 can flow in not only from the gap between adjacent light source devices 40 in the X direction, but also from the gap between adjacent light source devices 40 in the Y direction. This increases the amount of gas G1 that can flow into the light source device 40.

[0062] In the fourth embodiment, the second aperture 4j of each light source device 40 is not formed in a grid pattern, but forms a single aperture. The absence of a grid improves the conductance of the gas.

[0063] The first to fourth embodiments and their variations have been described above. However, the present invention is not limited in any way to the embodiments and variations described above, and the embodiments or variations described above can be combined without departing from the spirit of the present invention. Furthermore, various changes or improvements can be made to each embodiment and variation without departing from the spirit of the present invention. [Explanation of symbols]

[0064] 1: Solid state light source 2: Circuit board 3: Heat sink 3a: Main body 3b:Connection part 3c: Heat dissipation fins 3s: Joint surface 4: Cabinet 4h, 4i: First opening 4j:Second opening 5: Fan 7: Power supply connector 8: Temperature sensor 9: Power lines 11:Transparent part 12: Support part 12s: (Inner surface of the support part) 20,30,40:Light source device 22: Wind shield part 100, 200, 300, 400: Light source unit C1: Gap G1, G1x, G2, G3: Gases

Claims

1. A light source unit in which multiple light source devices are connected, Each of the aforementioned multiple light source devices is: A substrate on which multiple solid-state light sources are arranged, A heat sink including a bonding surface bonded to the substrate, a connecting portion connected to another light source device, and heat sinks with heat dissipation fins for dissipating heat from the substrate, A housing having a first opening on the side near the heat dissipation fin for circulating gas, and housing the heat dissipation fin, The system includes a fan that circulates the gas through the heat dissipation fins, A light source unit characterized in that the first openings, which are arranged opposite each other between different light source devices, are located inside the connecting portion, thereby creating a gap between the first openings, which are arranged opposite each other between different light source devices, for the circulation of the gas.

2. The light source unit according to claim 1, characterized in that the heat dissipation fin includes a plate material, and the plate material extends in a direction intersecting the side surface having the first opening.

3. The light source unit according to claim 1, characterized in that the housing has the first opening on each of the two sides facing each other.

4. The light source unit according to any one of claims 1 to 3, wherein at least one of the plurality of light source devices further comprises a power supply connector bonded to the substrate, avoiding a heat sink bonded to the substrate.

5. The light source unit according to claim 4, wherein at least one of the multiple light source devices is provided with a plurality of power supply connectors.

6. In at least one of the above-mentioned multiple light source devices, The light source unit according to claim 5, characterized in that the plurality of solid light sources are arranged along a first direction and a second direction perpendicular to the first direction, the arrangement pitch in the first direction is greater than the arrangement pitch in the second direction, and at least two of the plurality of power supply connectors are arranged in the first direction so as to overlap with the second direction.

7. The light source unit according to any one of claims 1 to 3, characterized in that at least one of the plurality of light source devices is provided in the housing with a windbreak portion that suppresses the mixing of gas flowing into the housing and gas discharged from the housing.

8. The light source unit according to any one of claims 1 to 3, characterized in that it has a light-transmitting portion disposed on the light-emitting side of the substrate.

9. The light source unit according to claim 8, further comprising a support portion for supporting the light-transmitting portion, wherein at least a portion of the support portion has a light-reflecting function for reflecting light emitted from the solid light source.

10. The light source unit according to claim 8, characterized in that the light-transmitting portion is a member arranged across a plurality of light source devices.

11. A substrate on which multiple solid-state light sources are arranged, A heat sink including a bonding surface bonded to the substrate, a connecting portion for connecting to other light source devices, and heat dissipation fins for dissipating heat from the substrate, A housing for the aforementioned heat sink, The heat sink is equipped with a fan that circulates gas from outside the housing, The housing has a first opening on its side surface for circulating the gas near the heat dissipation fins, A light source device characterized in that the first opening is located inside the connecting portion.

12. The light source device according to claim 11, characterized in that it comprises a power supply connector bonded to the substrate, avoiding a heat sink bonded to the substrate.

13. The light source device according to claim 12, characterized in that the light source device comprises a plurality of power supply connectors.

14. In the aforementioned light source device, The light source device according to claim 13, characterized in that the plurality of solid light sources are arranged along a first direction and a second direction perpendicular to the first direction, the arrangement pitch in the first direction is greater than the arrangement pitch in the second direction, and at least two of the plurality of power supply connectors are arranged in the first direction so as to overlap in the second direction.

15. Prepare a plurality of light source devices according to any one of claims 11 to 14, A method for forming a light source unit, comprising using the aforementioned connecting portion to connect a plurality of the aforementioned light source devices to each other, thereby forming a light source unit in which a plurality of light source devices are connected.

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