JP2020040468A - Head-up display device - Google Patents

Abstract

To provide a head-up display device that is able to hinder temperature variations of a plurality of light sources, resulting from cooling of a plurality of light sources with air from an air-conditioning unit.SOLUTION: In a case where air in a cooling air passage 22a flows through the cooling air passage 22a while absorbing heat from a heat dissipation member 30, the temperature of the air becomes higher toward the downstream of the cooling air passage 22a in air flow. Meanwhile, the heat dissipation member 30 has a variable heat dissipation structure in which dissipation of heat into air in the cooling air passage 22a becomes easier toward the downstream of the cooling air passage 22a in air flow. Therefore, it is possible to diminish such an inclination that the temperature of air in the cooling air passage 22a becomes higher toward the downstream of the cooling air passage 22a in air flow, making it difficult for the air to absorb heat. Accordingly, temperature variations of a plurality of light sources 201, resulting from cooling of the plurality of light sources 201 with air from an air-conditioning unit, can be hindered.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a head-up display device for a vehicle.

  As this type of head-up display device, for example, a head-up display device described in Patent Literature 1 is conventionally known. The head-up display device described in Patent Document 1 has a heat radiating member that radiates heat of a display device that emits light with heat generation. The heat dissipating member is disposed in a second ventilation path branched from the first ventilation path that sends the wind blown by the air conditioner into the vehicle interior. Due to such an arrangement of the heat radiating member, the display of the head-up display device is cooled by the wind of the air conditioner through the heat radiating member.

JP 2015-157575 A

  As a head-up display device (hereinafter, also referred to as a HUD device), there is a head-up display device including a plurality of light sources including, for example, light emitting diodes (that is, LEDs). In a case where a plurality of light sources are cooled by air in such a HUD device, the cooling air tends to become hotter toward the downstream side of the air flow due to heat absorption from the light sources. That is, if a plurality of light sources are cooled with air without any contrivance, it is considered that the light sources arranged on the downstream side of the air flow among the plurality of light sources are less likely to be cooled and become higher in temperature.

  Here, when the temperature of a light source such as an LED decreases, more current can flow through the light source, thereby increasing the brightness of the light source. However, if the temperatures of the light sources are different from each other according to the arrangement positions of the plurality of light sources as described above, the brightness of the plurality of light sources may be different from each other due to the difference between the temperatures. That is, the brightness of the plurality of light sources varies. Therefore, in order to suppress such variation in the brightness of the light sources, it is necessary to cool the plurality of light sources evenly.

  When a plurality of light sources are electrically connected in series, the current values of the light sources become equal to each other, but the current values depend on the light source having the highest temperature (that is, the light source having the worst degree of cooling). For this reason, it is important to cool the plurality of light sources uniformly so as to suppress the temperature variation of the light sources. As a result of detailed studies by the inventors, the above has been found.

  Patent Literature 1 described above discloses a technique for cooling a plurality of light sources by wind of an air conditioner (in other words, an air conditioning unit), but does not disclose a technique for uniformly cooling a plurality of light sources. Did not.

  In view of the above, it is an object of the present invention to provide a head-up display device capable of suppressing temperature variations of a plurality of light sources caused by cooling the plurality of light sources with air from an air conditioning unit. .

In order to achieve the above object, the head-up display device according to claim 1,
A head-up display device for a vehicle that displays an image,
A plurality of light sources (201) for emitting display light for displaying an image;
A passage forming portion (22) formed with an air passage (22a) through which air flowing out of an air conditioning unit (12) for performing air conditioning in the vehicle compartment is provided;
A heat radiating member (30) communicably connected to the plurality of light sources and radiating heat of the plurality of light sources to the air in the air passage;
The heat dissipating member has a configuration in which heat is more easily dissipated to the air in the air passage as the air flow downstream of the air passage.

  Here, when the air in the air passage flows through the air passage while absorbing heat from the heat radiating member, the air becomes hotter toward the air flow downstream of the air passage. On the other hand, as described above, the heat dissipating member has a configuration in which heat is more easily dissipated to the air in the air passage toward the downstream side of the air flow in the air passage.

  Therefore, it is possible to reduce the tendency that the air in the air passage becomes harder to absorb heat due to the higher temperature in the air passage downstream of the air passage. Therefore, it is possible to suppress the temperature variation of the plurality of light sources caused by cooling the plurality of light sources with the air from the air conditioning unit.

Further, the head-up display device according to claim 6 is
A head-up display device for a vehicle that displays an image,
A plurality of light sources (201) for emitting display light for displaying an image;
A passage forming portion (22) formed with an air passage (22a) through which air flowing out of an air conditioning unit (12) for performing air conditioning in the vehicle compartment is provided;
A heat radiating member (30) communicably connected to the plurality of light sources and radiating heat of the plurality of light sources to the air in the air passage;
The heat dissipating member has a heat dissipating inclined surface (301b) that is exposed into the air passage and extends from the air flow upstream side of the air passage to the air flow downstream side.
The heat radiation inclined surface is inclined with respect to the passage extending direction (DRc) in which the air passage extends so as to face the air flow upstream of the air passage.

  This allows the air that has flowed to a certain distance from the upstream side of the air flow of the heat radiation inclined surface to be dissipated, as compared to the case where the heat radiation inclined surface is not inclined but parallel to the passage extending direction, for example. It becomes easy to contact the part of the inclined surface on the downstream side of the air flow. That is, the air that has not absorbed much heat from the upstream portion of the air flow easily contacts the downstream portion of the air flow.

  Therefore, it is possible to reduce the tendency that the temperature of the air contacting the heat radiation inclined surface becomes higher toward the downstream side of the air flow in the air passage. Therefore, it is possible to suppress the temperature variation of the plurality of light sources caused by cooling the plurality of light sources with the air from the air conditioning unit.

Further, the head-up display device according to claim 8,
A head-up display device for a vehicle that displays an image,
A plurality of light sources (201) for emitting display light for displaying an image;
A passage forming portion (22) formed with an air passage (22a) through which air flowing out of an air conditioning unit (12) for performing air conditioning in the vehicle compartment is provided;
A heat radiating member (30) communicably connected to the plurality of light sources and radiating heat of the plurality of light sources to the air in the air passage;
The plurality of light sources are arranged along a light source arrangement direction (DRd) from the air flow upstream side of the air passage to the air flow downstream side,
The heat dissipating member protrudes into the air passage and extends in the direction in which the light sources are arranged, and an upstream heat dissipating fin (303) is disposed downstream of the air passage with respect to the upstream heat dissipating fin and protrudes into the air passage. And a downstream radiation fin (304) extending in the direction in which the light sources are arranged, and an airflow guide (305) provided in the air passage.
The airflow guide is arranged side by side with respect to the downstream radiation fins, and guides the air flowing along the upstream radiation fins away from the upstream radiation fins in the air passage to approach the downstream radiation fins. .

  Thereby, as compared with the case where there is no air flow guide, for example, the air that has flowed a certain distance from the upstream heat radiation fins is guided by the air flow guides, so that it can easily contact the downstream heat radiation fins. In other words, the air that has not absorbed much heat from the upstream radiation fins is more likely to contact the downstream radiation fins.

  Therefore, it is possible to reduce the temperature difference between the temperature of the air contacting the upstream heat radiation fins and the temperature of the air contacting the downstream heat radiation fins. Therefore, it is possible to suppress the temperature variation of the plurality of light sources caused by cooling the plurality of light sources with the air from the air conditioning unit.

  As described above, in any of the head-up display devices according to claims 1, 6, and 8, the heat radiating member is configured to cool the plurality of light sources with the air from the air conditioning unit. The configuration is such that variations can be suppressed.

  In addition, the reference numerals in parentheses attached to the respective components and the like indicate an example of a correspondence relationship between the components and the like and specific components and the like described in the embodiments described later.

FIG. 2 is a schematic configuration diagram schematically illustrating an air conditioning unit, a HUD device, and peripheral components of the HUD device in the first embodiment. FIG. 2 is a cross-sectional view schematically illustrating the HUD device according to the first embodiment. FIG. 3 is a sectional view showing a section taken along line III-III of FIG. 2. FIG. 4 is a sectional view showing an IV-IV section in FIG. 3. It is sectional drawing which showed typically the HUD device of 2nd Embodiment, and is a figure corresponding to FIG. FIG. 6 is a cross-sectional view showing a VI-VI cross section of FIG. 5 and is a view corresponding to FIG. 3. It is sectional drawing which showed the HUD device of 3rd Embodiment typically, and is a figure corresponding to FIG. FIG. 8 is a cross-sectional view showing a VIII-VIII cross section of FIG. 7 and is a view corresponding to FIG. 3. It is sectional drawing which showed HUD apparatus of 4th Embodiment typically, and is a figure corresponding to FIG.

  Hereinafter, each embodiment will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent are denoted by the same reference numerals in the drawings.

(1st Embodiment)
The head-up display device 10 of the present embodiment is a device for a vehicle, and displays an image visually recognized by an occupant on a front windshield glass. The image displayed by the head-up display device 10 includes, for example, information related to vehicle travel.

  As shown in FIG. 1, a vehicle equipped with a head-up display device 10 (hereinafter, also referred to as a HUD device 10) includes an air conditioning unit 12 and the like for performing air conditioning in a vehicle compartment, in addition to the HUD device 10. The HUD device 10 and the air conditioning unit 12 are arranged, for example, inside an instrument panel provided in a vehicle interior. In FIG. 1, the air conditioning unit 12, the air conditioning duct 14, and the like are partially illustrated in cross section.

  The air conditioning unit 12 includes a blower 121, an air conditioning case 122, an evaporator 123, a heater core 124, and the like. The blower 121 sucks air from inside or outside the vehicle, and blows the sucked air.

  Inside the air conditioning case 122, a unit passage 122a through which air blown from the blower 121 flows is formed. The air conditioning case 122 forms an outer shell of the air conditioning unit 12. Therefore, the unit passage 122 a is a passage in the air conditioning unit 12.

  The evaporator 123 and the heater core 124 are arranged in the unit passage 122a. That is, the evaporator 123 and the heater core 124 are housed in the air conditioning case 122. The evaporator 123 is a cooler that cools the air flowing through the unit passage 122a. The evaporator 123 evaporates the refrigerant and cools the air by exchanging heat between the air and the refrigerant.

  The heater core 124 is disposed downstream of the air flow with respect to the evaporator 123 in the unit passage 122a. The heater core 124 is a heater that heats the air flowing out of the evaporator 123 in the unit passage 122a. The heater core 124 heats the air with the heat of the engine cooling water by exchanging heat between the air and the engine cooling water.

  The in-unit passage 122a has a hot air passage 122c for circulating air to the heater core 124 and a bypass passage 122d for circulating air around the heater core 124 on the downstream side of the air flow with respect to the evaporator 123. In addition, the air conditioning case 122 has a plurality of blowout openings communicating with the unit internal passage 122a on the downstream side of the air flow with respect to each of the hot air passage 122c and the bypass passage 122d. The plurality of outlets include, for example, a face outlet, a defroster outlet, and a foot outlet. In FIG. 1, a part of the plurality of outlets is illustrated as an outlet 122b.

  The air conditioning unit 12 configured as described above introduces vehicle interior air or vehicle exterior air by the blower 121, and adjusts the temperature of the introduced air by increasing or decreasing the opening of each of the hot air passage 122c and the bypass passage 122d. By doing. Then, the air conditioning unit 12 blows out the temperature-conditioned air from any of the plurality of outlets including the outlet 122b into the vehicle interior as indicated by an arrow ARa. Thereby, the air conditioning unit 12 performs air conditioning of the vehicle interior.

  An air-conditioning duct is connected to each of the plurality of outlets of the air-conditioning case 122, and the conditioned air flowing out of the outlets is blown into the passenger compartment through the air-conditioning duct. That is, a plurality of air conditioning ducts are provided in the vehicle in accordance with the number of the air outlets of the air conditioning unit 12.

  FIG. 1 shows one of the air conditioning ducts as an air conditioning duct 14. That is, the inlet end, which is the airflow upstream end of the air conditioning duct 14 shown in FIG. 1, is connected to any one of the plurality of blowout openings provided in the air conditioning unit 12. The outlet end of the air-conditioning duct 14, which is the downstream end of the air flow, is open to a predetermined location in the vehicle interior.

  Further, inside the air conditioning duct 14, a duct passage 14a extending from the entrance end to the exit end of the air conditioning duct 14 is formed. Therefore, the duct passage 14a is a ventilation passage for guiding the conditioned air flowing out of the air conditioning unit 12 to a predetermined location in the vehicle interior.

  In the present embodiment, the inlet end of the air conditioning duct 14 is connected to the face blowout opening of the plurality of blowout openings. The outlet end of the air conditioning duct 14 is connected to a face outlet provided on a side surface of an instrument panel in the vehicle interior, and is opened to the vehicle interior through the face outlet. Therefore, in the present embodiment, the predetermined location in the vehicle interior is a front portion of the vehicle where the face outlet is open in the vehicle interior.

  As shown in FIGS. 1 and 2, the HUD device 10 includes a light source unit 20, a passage forming portion 22, an introduction-side tube portion 24, an outlet-side tube portion 26, and a heat dissipation member 30.

  As shown in FIG. 2, the light source unit 20 includes components related to image display, and specifically includes a plurality of light sources 201, a plurality of lenses 202, a display element 204, and the like.

  The plurality of light sources 201 are light-emitting elements that emit light when energized, and are specifically light-emitting diodes (in other words, LEDs). That is, the plurality of light sources 201 emit display light for displaying an image. Further, the plurality of light sources 201 generate heat as they emit light.

  The display element 204 is, for example, a transmission type TFT liquid crystal display panel.

  In the HUD device 10, display light emitted from a plurality of light sources 201 passes through a plurality of lenses 202 and then passes through a display element 204. When the display light passes through the display element 204, an image on the display element 204 can be displayed. The display light that has passed through the display element 204 enters the front windshield glass. Then, the incident display light is reflected by the front windshield glass as a transmission / reflection surface, so that an image formed by the display light becomes a virtual image formed in front of the front windshield glass on the vehicle as an occupant. Are displayed so as to be visually recognized.

  The passage forming portion 22 is arranged on the opposite side of the plurality of light sources 201 from the side on which the light sources 201 emit display light, and is arranged adjacent to the plurality of light sources 201. A cooling air passage 22 a is formed inside the passage forming portion 22. The cooling air passage 22a is an air passage through which cooling air for cooling the plurality of light sources 201 flows, and extends in the passage extending direction DRc. The cooling air passage 22a has an inlet end 22b on the air flow upstream side of the cooling air passage 22a, and has an outlet end 22c on the cooling air passage 22a downstream of the air flow.

  The introduction side pipe part 24, the passage forming part 22, and the discharge side part 26 are connected in series in the order of the introduction side part 24, the passage formation part 22, and the discharge side part 26. In addition, the introduction-side tube portion 24, the passage forming portion 22, and the discharge-side tube portion 26 integrally constitute one tube member 28. All or a part of the pipe member 28 is formed of, for example, a bellows hose that is easily bent. That is, at least a part of the tube member 28 has flexibility.

  As shown in FIGS. 1 and 2, the introduction-side tube portion 24 has an inlet end 241 which is an airflow upstream end of the introduction-side tube portion 24. The inlet end 241 of the introduction-side pipe portion 24 is located in the unit passage 122a on the downstream side of the air flow with respect to the evaporator 123, and is a cool air distribution part through which the air cooled by the evaporator 123 (that is, the cool air) flows. 122e. More specifically, the air cooled by the evaporator 123 is cold air that is not heated by the heater core 124, and thus can be said to be lower-temperature air than air before flowing into the evaporator 123. Further, in the present embodiment, the cool air circulating portion 122e is a portion of the in-unit passage 122a downstream of the air flow with respect to the evaporator 123 and upstream of the air flow with respect to the heater core 124.

  Therefore, the introduction-side ventilation passage 24a formed in the introduction-side pipe portion 24 connects the cool air circulation portion 122e of the unit passage 122a and the inlet end 22b of the cooling air passage 22a. That is, the inlet end 22b of the cooling air passage 22a communicates with the cool air circulation portion 122e via the introduction-side ventilation passage 24a. Then, the introduction-side pipe portion 24 guides the air as the cool air flowing out of the air conditioning unit 12 to the cooling air passage 22a. Therefore, the air flowing out of the air conditioning unit 12 (in other words, , Air conditioning style).

  The outlet-side tube portion 26 has an outlet end 261 which is a downstream end of the air flow of the outlet-side tube portion 26, and the outlet end 261 is connected to the duct passage 14a. Therefore, the outlet pipe 26a formed in the outlet pipe 26 connects the outlet end 22c of the cooling air passage 22a to the duct passage 14a. That is, the outlet end 22c of the cooling air passage 22a communicates with the duct passage 14a via the outlet-side conduit 26a.

  As shown in FIGS. 2 and 3, the heat radiating member 30 is connected to the plurality of light sources 201 so as to be able to conduct heat, and radiates the heat of the plurality of light sources 201 to the air in the cooling air passage 22a. Therefore, the heat radiating member 30 has a heat radiating plate 301 and a plurality of heat radiating fins 302. The heat radiation member 30 is made of a metal such as an aluminum alloy having good thermal conductivity. For example, each of the heat radiating plate 301 and the heat radiating fin 302 is made of a metal such as an aluminum alloy and has an integrated structure.

  The heat radiating plate 301 of the heat radiating member 30 has a plate shape (specifically, a flat plate shape) extending along the passage extending direction DRc. The heat sink 301 has one surface 301a connected to the plurality of light sources 201, and another surface 301b opposite to the one surface 301a.

  The plurality of light sources 201 are arranged along one surface 301a of the heat radiating plate 301 so as to line up from the air flow upstream side of the cooling air passage 22a to the air flow downstream side. In other words, the plurality of light sources 201 are arranged along the light source arrangement direction DRd from the upstream side of the air flow to the downstream side of the air flow of the cooling air passage 22a. For example, a plurality of light source rows including a plurality of light sources 201 arranged in the light source arrangement direction DRd are formed in parallel. Each of the plurality of light sources 201 is fixed to one surface 301a of the heat radiating plate 301 while being electrically insulated from the heat radiating plate 301. In the present embodiment, the light source arrangement direction DRd is parallel to the passage extending direction DRc.

  As shown in FIGS. 2 and 4, the heat radiating plate 301 is a part of the heat radiating member 30, and the heat radiating plate 301 is also included in the passage forming portion 22 and forms a part of the passage forming portion 22. The other surface 301b of the heat radiating plate 301 is a passage wall surface facing the cooling air passage 22a. In FIG. 4, components other than the light source 201 among components of the light source unit 20 are not shown.

  As shown in FIGS. 2 to 4, the plurality of radiating fins 302 of the radiating member 30 respectively protrude from the other surface 301 b of the radiating plate 301 into the cooling air passage 22 a. Therefore, each of the plurality of radiating fins 302 is exposed into the cooling air passage 22a. Further, each of the plurality of radiation fins 302 is formed so as to extend in the light source arrangement direction DRd. In the present embodiment, for example, the radiation fins 302 extend over the entire length of the radiation plate 301 in the light source arrangement direction DRd. Accordingly, the positions of the plurality of light sources 201 in the light source arrangement direction DRd are all within the range occupied by the radiation fins 302 in the light source arrangement direction DRd.

  The heat radiation fin 302 has a base end 302a connected to the other surface 301b of the heat radiation plate 301. At least one of the plurality of light sources 201 is disposed at a position overlapping the base end 302 a of the heat radiation fin 302 in the thickness direction DRe of the heat radiation plate 301.

  In the present embodiment, all the light sources 201 belonging to one of the two light source rows are arranged in the thickness direction DRe of the heat radiating plate 301 with respect to the base end 302a of one of the two heat radiating fins 302. It is arranged in the place which overlaps. Then, a place where all the light sources 201 belonging to the other of the two light source rows overlap with the base end 302a of the other of the two heat radiation fins 302 in the thickness direction DRe of the heat radiation plate 301. Are located in

  Further, as shown in FIG. 2, the protruding height Hfn of the radiating fin 302 from the other surface 301b of the radiating plate 301 gradually increases toward the downstream side of the air flow of the cooling air passage 22a. Thus, the heat radiating member 30 has a variable heat radiating configuration in which heat is more easily radiated to the air in the cooling air passage 22a toward the downstream side of the air flow of the cooling air passage 22a. Specifically, the variable heat radiation configuration is a configuration in which the heat radiation area Ahr of the heat radiation member 30 with respect to the air in the cooling air passage 22a increases toward the downstream of the air flow of the cooling air passage 22a.

  Here, the heat radiation area Ahr of the heat radiation member 30 is, in other words, an area of the surface area of the heat radiation member 30 that is exposed to the cooling air passage 22a. Therefore, in this embodiment, the heat radiation area Ahr of the heat radiation member 30 is the sum of the area of the other surface 301 b of the heat radiation plate 301 and the surface area of the heat radiation fin 302.

  In addition, the above-mentioned "configuration in which the heat radiation area Ahr of the heat radiation member 30 increases toward the downstream side of the air flow of the cooling air passage 22a" is as follows in detail. That is, the configuration is such that the heat radiation area Ahr of the heat radiation member 30 per unit length in the passage extending direction DRc increases toward the downstream side of the air flow of the cooling air passage 22a.

  Since such a heat radiating member 30 is provided in the HUD device 10, cooling of the plurality of light sources 201 included in the HUD device 10 is promoted by the heat radiating member 30. The cooling of the light source 201 will be specifically described. As shown in FIG. 1, first, by the operation of the blower 121 of the air conditioning unit 12, the air cooled by the evaporator 123 flows from the unit passage 122 a as indicated by an arrow ARb. It flows into the introduction side pipe part 24.

  As shown in FIGS. 1 and 2, the air that has flowed into the introduction-side tube portion 24 flows from the inside of the introduction-side tube portion 24 to the cooling air passage 22a. It goes to the outlet end 22c of the cooling air passage 22a while contacting the fin 302. At this time, since the heat of the plurality of light sources 201 is conducted to the heat radiating member 30, the air flowing through the cooling air passage 22a absorbs heat from the light source 201 through the heat radiating member 30 and, at the same time, the light source 201 is cooled. Is done.

  The air that has received heat from the plurality of light sources 201 in the cooling air passage 22a flows into the outlet-side tube portion 26 from the cooling air passage 22a. The air that has flowed into the outlet-side tube portion 26 flows from the outlet-side tube portion 26 into the duct passage 14a, and is blown out from the duct passage 14a into the vehicle interior together with the conditioned air flowing through the duct passage 14a.

  As described above, according to the present embodiment, the HUD device 10 includes the heat radiation member 30 as shown in FIG. The heat radiating member 30 is connected to the plurality of light sources 201 so as to be able to conduct heat, and radiates heat of the plurality of light sources 201 to air in the cooling air passage 22a. The heat dissipating member 30 has a configuration (ie, a variable heat dissipating configuration) in which heat is more easily dissipated to the air in the cooling air passage 22a toward the downstream of the air flow from the cooling air passage 22a.

  Here, when the air in the cooling air passage 22a flows through the cooling air passage 22a while absorbing heat from the heat radiating member 30, the air becomes hotter toward the downstream side of the air flow of the cooling air passage 22a. On the other hand, as described above, the heat radiating member 30 has a variable heat radiating configuration in which heat is more easily radiated to the air in the cooling air passage 22a toward the downstream side of the air flow of the cooling air passage 22a.

  Therefore, it is possible to reduce the tendency that the air in the cooling air passage 22a becomes harder to absorb heat due to the higher temperature in the air flow downstream of the cooling air passage 22a. Therefore, it is possible to suppress the temperature variation of the plurality of light sources 201 caused by cooling the plurality of light sources 201 with the air from the air conditioning unit 12. For example, it is possible to uniformly cool the plurality of light sources 201 with the air in the cooling air passage 22a and suppress temperature variations among the plurality of light sources 201.

  If the temperature variation of the plurality of light sources 201 is suppressed, it is possible to eliminate color unevenness in the plurality of light sources 201 functioning as the backlight of the display element 204 as a whole. At the same time, the brightness of the plurality of light sources 201 can be improved by increasing the input current to the plurality of light sources 201.

  According to the present embodiment, the variable heat radiation configuration of the heat radiation member 30 specifically means that the heat radiation area Ahr of the heat radiation member 30 with respect to the air in the cooling air passage 22a is the air of the cooling air passage 22a. In this configuration, the downstream side is enlarged. Therefore, the variable heat radiation configuration can be easily realized by the external shape of the heat radiation member 30.

  Further, according to the present embodiment, the plurality of light sources 201 are arranged in the light source arrangement direction DRd from the upstream side of the air flow to the downstream side of the air flow of the cooling air passage 22a. The radiating fins 302 of the radiating member 30 protrude into the cooling air passage 22a from the other surface 301b of the radiating plate 301 as a passage wall surface and extend in the light source arrangement direction DRd. The protruding height Hfn of the radiating fin 302 from the other surface 301b of the radiating plate 301 becomes higher toward the downstream side of the air flow of the cooling air passage 22a, so that the radiating area Ahr of the radiating member 30 is reduced. The air passage 22a is enlarged toward the downstream side of the air flow.

  Therefore, it is possible to easily realize a configuration in which the heat radiation area Ahr of the heat radiation member 30 is increased toward the downstream side of the air flow of the cooling air passage 22a by changing the protrusion height Hfn of the heat radiation fin 302.

  Further, according to the present embodiment, the protruding height Hfn of the radiating fin 302 from the other surface 301b of the radiating plate 301 gradually increases toward the downstream side of the air flow of the cooling air passage 22a. Therefore, it is possible to prevent the heat exchange between the heat radiating member 30 and the air in the cooling air passage 22a from being suddenly changed in the cooling air passage 22a, and to cool the plurality of light sources 201 evenly. .

  Further, according to the present embodiment, as shown in FIGS. 2 to 4, at least one of the plurality of light sources 201 overlaps with the base end 302 a of the heat radiation fin 302 in the thickness direction DRe of the heat radiation plate 301. It is located at the place. Therefore, the heat of the light source 201 disposed at a position overlapping the base end 302a of the heat radiation fin 302 in the thickness direction DRe of the heat radiation plate 301 is easily transmitted to the heat radiation fin 302, and the light source 201 is easily cooled.

  Further, according to the present embodiment, as shown in FIGS. 1 and 2, the inlet end 22b of the cooling air passage 22a is located on the downstream side of the air flow with respect to the evaporator 123 in the unit internal passage 122a, and The air cooled by the vessel 123 communicates with a cool air circulation portion 122e through which the air flows. Therefore, the plurality of light sources 201 can be cooled by the air cooled by the evaporator 123 of the air conditioning unit 12. For example, the cooling of the light source 201 can be promoted as compared with the case where the light source 201 is cooled by the conditioned air whose temperature is adjusted by heating the heater core 124 or the like in the air conditioning unit 12.

  The cool air, which is the air cooled by the evaporator 123 and flowing to the cool air flowing portion 122e, has a lower temperature than the conditioned air flowing out of the air flow downstream of the heater core 124 in the air conditioning unit 12. Then, the cool air cooled by the evaporator 123 is directly used for cooling the light source 201. Therefore, the luminance of the light source 201 can be improved. In addition, when the HUD device 10 becomes too hot before starting, derating, which is control for delaying the start of the HUD device 10, may be performed from the viewpoint of protection of electronic components. When the derating is performed in such a manner, the luminance of the light source 201 can be secured early by shortening the time for performing the derating.

  Further, since the cool air cooled by the evaporator 123 is used for cooling the light source 201, it is possible to reduce or eliminate cooling components for heat dissipation such as a heat sink and a heat dissipation sheet. As a result, significant effects are expected on the HUD device 10 in terms of vehicle mountability, weight reduction, and cost reduction.

  Further, according to the present embodiment, as shown in FIGS. 1 and 2, the air-conditioning duct 14 is provided with the duct passage 14 a for guiding the conditioned air flowing out of the air-conditioning unit 12 to a predetermined location in the vehicle compartment. . The outlet end 22c of the cooling air passage 22a communicates with the duct passage 14a. Therefore, the air used for cooling the light source 201 can be used for air conditioning in the vehicle interior.

  Further, according to the present embodiment, the HUD device 10 includes the introduction-side pipe portion 24 that guides the air flowing out of the air conditioning unit 12 to the cooling air passage 22a. In addition, the HUD device 10 includes an outlet-side tube portion 26 through which air that has received heat from the plurality of light sources 201 flows from the cooling air passage 22a in the cooling air passage 22a. And the introduction side pipe part 24, the passage forming part 22, and the discharge side pipe part 26 are connected in series to form a pipe member 28. Therefore, it is possible to reduce the number of joints in the air flow path from the introduction-side tube portion 24 to the discharge-side tube portion 26, and to easily prevent air leakage.

  Further, according to the present embodiment, at least a part of the tube member 28 has flexibility. Therefore, piping of the pipe member 28 for cooling the light source 201 can be easily performed.

(2nd Embodiment)
Next, a second embodiment will be described. In the present embodiment, points different from the first embodiment will be mainly described. In addition, the same or equivalent parts as those of the above-described embodiment will be omitted or simplified. This is the same in the following description of the embodiment.

  As shown in FIGS. 5 and 6, in the present embodiment, the length of the radiation fins 302 in the light source arrangement direction DRd is shorter than in the first embodiment.

  Specifically, the position of the downstream end 302b of the radiation fin 302 on the downstream side of the air flow of the cooling air passage 22a is the same as that of the first embodiment. However, the position of the upstream end 302c that the radiation fin 302 has on the air flow upstream side of the cooling air passage 22a is different from that of the first embodiment, and is aligned with the central portion of the radiation plate 301 in the light source arrangement direction DRd. I have.

  That is, the range occupied by the radiation fins 302 in the light source arranging direction DRd overlaps the range occupied by the plurality of light sources 201 in the light source arranging direction DRd, and is biased toward the air flow downstream of the cooling air passage 22a. Similarly, the range occupied by the radiating fins 302 in the light source arranging direction DRd overlaps with the range occupied by the heat radiating plate 301 in the light source arranging direction DRd and is biased toward the air flow downstream side of the cooling air passage 22a. I have.

  Except as described above, this embodiment is the same as the first embodiment. Further, in the present embodiment, the effects obtained from the configuration common to the above-described first embodiment can be obtained in the same manner as the first embodiment.

(Third embodiment)
Next, a third embodiment will be described. In the present embodiment, points different from the first embodiment will be mainly described.

  As shown in FIGS. 7 and 8, the heat radiation member 30 of the present embodiment has an upstream heat radiation fin 303 and a downstream heat radiation fin 304 as heat radiation fins corresponding to the heat radiation fins 302 of the first embodiment. I have. In addition, the heat dissipation member 30 of the present embodiment has an airflow guide 305. The present embodiment differs from the first embodiment in these points.

  Specifically, the upstream radiating fins 303 and the downstream radiating fins 304 protrude into the cooling air passage 22a from the other surface 301b of the heat radiating plate 301 and are formed to extend in the light source arrangement direction DRd. The downstream radiation fins 304 are arranged downstream of the upstream radiation fins 303 in the air flow direction of the cooling air passage 22a with a fin gap 304a. Although a plurality of the upstream radiating fins 303 and a plurality of the downstream radiating fins 304 are provided, in the present embodiment, two fins are provided, that is, a total of four fins are provided.

  As shown in FIG. 8, the upstream radiating fin 303 has an upstream end 303b on the upstream side of the air flow of the cooling air passage 22a, and has a downstream end 303c on the downstream side of the air flow of the cooling air passage 22a. are doing. Similarly, the downstream radiation fins 304 have an upstream end 304b upstream of the air flow of the cooling air passage 22a and a downstream end 304c downstream of the air flow of the cooling air passage 22a.

  The mutual pitch of the upstream ends 303b of the two upstream radiation fins 303 in the passage width direction DRf of the cooling air passage 22a is の of the entire width Wa of the cooling air passage 22a. The two upstream radiation fins 303 are arranged symmetrically in the passage width direction DRf. Also, the two downstream radiation fins 304 are also symmetrically arranged in the passage width direction DRf. The passage width direction DRf of the cooling air passage 22a is a direction orthogonal to the passage extending direction DRc and along the other surface 301b of the heat sink 301.

  The airflow guide 305 is provided in the cooling air passage 22a in parallel with the downstream radiating fins 304. The airflow guide 305 is arranged in the passage width direction DRf with respect to the downstream radiating fin 304. More specifically, the air flow guide 305 is disposed between the two downstream radiating fins 304 at an interval from each of the downstream radiating fins 304.

  The upstream radiating fins 303 are curved outward in the passage width direction DRf around the downstream end 303c including the downstream end 303c. On the other hand, the downstream radiation fins 304 are curved inward in the passage width direction DRf around the upstream end 304b including the upstream end 304b. Then, the upstream end 304b of the downstream radiation fin 304 is shifted inward in the passage width direction DRf with respect to the downstream end 303c of the upstream radiation fin 303.

  Therefore, the air flowing along the upstream heat radiation fin 303 while contacting the upstream heat radiation fin 303 inside the passage width direction DRf with respect to the upstream heat radiation fin 303 is guided as indicated by an arrow ARc. That is, the air is guided by the upstream radiation fins 303 and the downstream radiation fins 304 to the outside of the downstream radiation fins 304 in the passage width direction DRf.

  Then, the airflow guide 305 causes the air flowing along the upstream radiating fin 303 as shown by the arrow ARd in the cooling air passage 22a to be separated from the upstream radiating fin 303 by the downstream radiating fin as shown by the arrow ARe. Guide to the 304 side.

  Thereby, as compared with the case where the air flow guide 305 is not provided, for example, the air that has flowed away from the upstream heat radiation fins 303 by a certain distance as shown by the arrow ARd is guided by the air flow guide 305, and It becomes easy to contact the heat radiation fin 304. That is, the air that has not absorbed much heat from the upstream radiating fins 303 is likely to contact the downstream radiating fins 304.

  Therefore, it is possible to reduce the temperature difference between the temperature of the air contacting the upstream heat radiation fins 303 and the temperature of the air contacting the downstream heat radiation fins 304. Therefore, it is possible to suppress the temperature variation of the plurality of light sources 201 caused by cooling the plurality of light sources 201 with the air from the air conditioning unit 12. For example, it is possible to uniformly cool the plurality of light sources 201 with the air in the cooling air passage 22a and suppress temperature variations among the plurality of light sources 201.

  In this embodiment, as shown in FIGS. 7 and 8, the upstream radiating fin 303 has a base end 303 d connected to the other surface 301 b of the radiating plate 301. It has a base end 304d connected to the surface 301b. At least one of the plurality of light sources 201 is disposed at a position overlapping the base end 303d of the upstream heat radiation fin 303 or the base end 304d of the downstream heat radiation fin 304 in the thickness direction DRe of the heat radiation plate 301. I have.

  Except as described above, this embodiment is the same as the first embodiment. Further, in the present embodiment, the effects obtained from the configuration common to the above-described first embodiment can be obtained in the same manner as the first embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described. In the present embodiment, points different from the first embodiment will be mainly described.

  As shown in FIG. 9, the light source unit 20 of the present embodiment is inclined compared to the light source unit 20 of the first embodiment. This embodiment is different from the first embodiment in this point.

  In detail, in the present embodiment, the light source arrangement direction DRd is a direction from the air flow upstream side of the cooling air passage 22a to the air flow downstream side, but is inclined with respect to the passage extending direction DRc. Therefore, the heat radiating member 30 is disposed so that the heat radiating plate 301 is inclined with respect to the passage extending direction DRc.

  Therefore, the other surface 301b of the heat radiating plate 301 is a heat radiating inclined surface that is exposed into the cooling air passage 22a and extends from the air flow upstream side of the cooling air passage 22a to the air flow downstream side. The other surface 301b of the heat radiating plate 301 as the heat radiating inclined surface is inclined with respect to the passage extending direction DRc so as to face the air flow upstream of the cooling air passage 22a.

  Thus, for example, the following can be said as compared with a case where the other surface 301b of the heat radiation plate 301 is not inclined but parallel to the passage extending direction DRc. That is, as compared with the case, the air that has flowed to some extent from the airflow upstream portion of the other surface 301b, which is the heat radiation inclined surface, flows to the airflow downstream portion of the other surface 301b. Easy to contact. In short, the air that has not absorbed much heat from the upstream portion of the air flow of the other surface 301b is likely to contact the downstream portion of the air flow of the other surface 301b.

  Therefore, it is possible to reduce the tendency that the temperature of the air contacting the other surface 301b of the heat radiating plate 301 becomes higher toward the downstream side of the air flow in the cooling air passage 22a. Therefore, it is possible to suppress the temperature variation of the plurality of light sources 201 caused by cooling the plurality of light sources 201 with the air from the air conditioning unit 12. For example, it is possible to uniformly cool the plurality of light sources 201 with the air in the cooling air passage 22a and suppress temperature variations among the plurality of light sources 201.

  Except as described above, this embodiment is the same as the first embodiment. Further, in the present embodiment, the effects obtained from the configuration common to the above-described first embodiment can be obtained in the same manner as the first embodiment.

  Note that the present embodiment is a modification based on the first embodiment, but the present embodiment can be combined with the above-described second embodiment or the third embodiment.

(Other embodiments)
(1) In each of the above embodiments, the light source 201 shown in FIG. 2 and the like is a light emitting diode, but is not limited thereto, and may be, for example, a light bulb.

  (2) In each of the above embodiments, as shown in FIG. 2, the plurality of light sources 201 are physically separated from each other, but need to be physically separated from each other. There is no. For example, the plurality of light sources 201 may be a plurality of light sources in view of their functions, and may be an integrated structure.

  (3) In each of the above embodiments, the air conditioning duct 14 shown in FIG. 1 is a duct that connects the face outlet and the face outlet, but this is an example. For example, the air-conditioning duct 14 may be a duct that connects a defroster outlet of the plurality of outlets and a defroster outlet that opens into the vehicle interior toward the front windshield glass. Alternatively, the air conditioning duct 14 may be a duct that connects a foot outlet of the plurality of outlets with a foot outlet that opens at the foot of the occupant in the vehicle interior.

  (4) In the above-described first embodiment, as shown in FIG. 3, all the light sources 201 included in the HUD device 10 are arranged such that the light-emitting plate 301 Is arranged at a position overlapping in the thickness direction DRe, but this is an example. For example, it is conceivable that any one of the light sources 201 is arranged at a position that does not overlap the base end 302a of any of the heat radiation fins 302 in the thickness direction DRe of the heat radiation plate 301.

  (5) In each of the above embodiments, as shown in FIG. 2 and the like, the other surface 301b of the heat sink 301 is a passage wall surface facing the cooling air passage 22a, but is not the passage wall surface. Can also be considered. For example, a passage wall is provided between the heat radiating plate 301 and the cooling air passage 22a and faces the cooling air passage 22a, and the cooling fin 302 penetrates from the heat radiating plate 301 through the passage wall. It is also conceivable that it protrudes into 22a.

  (6) In each of the above-described embodiments, as shown in FIG. 1, the cool air circulation part 122 e is a part of the unit passage 122 a on the downstream side of the air flow with respect to the evaporator 123 and on the upstream side of the air flow with respect to the heater core 124. Yes, but this is an example. For example, the cool air circulation part 122e may be a part included in the bypass passage 122d in the unit passage 122a. This is because the cool air not heated by the heater core 124 also flows through the bypass passage 122d.

  (7) In the above-described first embodiment, as shown in FIG. 2, the variable heat radiation structure of the heat radiation member 30 means that the heat radiation area Ahr of the heat radiation member 30 with respect to the air in the cooling air passage 22a is equal to the cooling air passage 22a. This configuration is an example in which the air flow becomes larger toward the downstream side of the air flow, but this is an example. For example, the passage cross-sectional area of the cooling air passage 22a may become smaller toward the downstream side of the air flow, and the heat radiation member 30 may be configured to be exposed to such a cooling air passage 22a.

  If so, the flow velocity of the air in the cooling air passage 22a becomes higher toward the downstream side of the air flow. Therefore, the air in the cooling air passage 22a is more likely to exchange heat with the heat radiating member 30 toward the downstream side of the air flow, and a variable heat radiating structure of the heat radiating member 30 is realized even when the protruding height Hfn of the heat radiating fin 302 is constant. Because it is done. In short, the variable heat radiation configuration is such that, assuming that the temperature of the air in the cooling air passage 22a is the same at any point in the cooling air passage 22a, the lower the air flow of the cooling air passage 22a is, Any configuration may be used as long as heat can be easily released to the air in the cooling air passage 22a. The configuration in which the cross-sectional area of the cooling air passage 22a is reduced toward the downstream side of the air flow can be realized by, for example, the shape of the passage forming portion 22 or the shape of the heat radiation member 30.

  (8) In the above-described third embodiment, as shown in FIG. 8, a fin gap 304a is provided between the upstream radiation fin 303 and the downstream radiation fin 304, but this is an example. For example, it is conceivable that there is no fin gap 304a, and the upstream radiation fin 303 and the downstream radiation fin 304 are connected.

  (9) In the third embodiment, as shown in FIGS. 7 and 8, the protruding heights Hfn of the upstream and downstream radiating fins 303 and 304 (see FIG. 2) are cooled similarly to the first embodiment. The air passage 22a is higher on the downstream side of the air flow, but this is an example. This change in the protrusion height Hfn is not essential in the third embodiment.

  For example, in the third embodiment, it is also assumed that the protruding heights Hfn of the upstream and downstream radiating fins 303 and 304 are constant from the airflow upstream side of the cooling air passage 22a to the airflow downstream side. it can. Even in such a case, when the plurality of light sources 201 are cooled by the air from the air conditioning unit 12, it is possible to suppress the temperature variation of the plurality of light sources 201 due to the cooling. 305.

  (10) In the above-described fourth embodiment, as shown in FIG. 9, the other surface 301 b of the heat radiating plate 301 is the above-described heat radiating inclined surface, but is not limited thereto. It can be an inclined surface.

  (11) In the above-described fourth embodiment, as shown in FIG. 9, the protruding height Hfn (see FIG. 2) of the radiation fins 302 is closer to the air flow downstream of the cooling air passage 22a as in the first embodiment. It is expensive, but this is an example. This change in the protrusion height Hfn is not essential in the fourth embodiment.

  For example, in the fourth embodiment, the protruding height Hfn of the radiating fins 302 can be assumed to be constant from the air flow upstream side of the cooling air passage 22a to the air flow downstream side. Even in such a case, when the plurality of light sources 201 are cooled by the air from the air conditioning unit 12, the effect of being able to suppress the temperature variation of the plurality of light sources 201 due to the cooling is obtained. is there. The function and effect are due to the other surface 301b of the heat radiating plate 301 being the above-described heat radiating inclined surface.

  (12) The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. In addition, the above embodiments are not irrelevant to each other, and can be appropriately combined unless a combination is clearly impossible. In each of the above embodiments, it is needless to say that the elements constituting the embodiments are not necessarily essential, unless otherwise clearly indicated as being essential or in principle considered to be clearly essential. No.

  In each of the above embodiments, when a numerical value such as the number, numerical value, amount, range, or the like of the constituent elements of the exemplary embodiment is mentioned, it is particularly limited to a specific number when it is clearly stated that it is essential and in principle. The number is not limited to the specific number unless otherwise specified. Further, in each of the above embodiments, when referring to the material, shape, positional relationship, and the like of the constituent elements, unless otherwise specified, and in principle, it is limited to a specific material, shape, positional relationship, and the like. It is not limited to the material, shape, positional relationship, and the like.

(Summary)
According to the first aspect described in part or all of the above embodiments, the heat radiating member is connected to the plurality of light sources so as to be able to conduct heat, and radiates heat of the plurality of light sources to the air in the air passage. I do. The heat dissipating member is configured such that heat is more easily dissipated to the air in the air passage toward the downstream side of the air flow in the air passage.

  Further, according to the second aspect, the above-described configuration in which the heat is more easily radiated to the air in the air passage toward the downstream side of the air flow in the air passage is different from the air flow in the air passage in the air passage. It is a configuration that expands toward the downstream side. Therefore, it is possible to easily realize the above-described configuration in which the heat is more easily dissipated to the air in the air passage toward the downstream side of the air flow in the air passage by the outer shape of the heat dissipation member.

  According to the third aspect, the plurality of light sources are arranged in the light source arrangement direction from the air flow upstream side of the air passage to the air flow downstream side. The heat dissipating member has a heat dissipating fin that protrudes from the passage wall surface facing the air passage into the air passage and extends in the light source arrangement direction. The projecting height of the radiation fin from the passage wall surface is higher toward the downstream side of the air flow in the air passage, whereby the heat radiation area of the heat radiation member is increased toward the downstream side of the air flow in the air passage. Therefore, it is possible to easily realize a configuration in which the heat radiation area of the heat radiation member increases toward the downstream side of the air flow in the air passage by changing the protruding height of the heat radiation fin.

  According to the fourth aspect, the projecting height of the radiation fin gradually increases toward the downstream side of the air flow in the air passage. Therefore, it is possible to prevent the easiness of heat exchange between the heat radiating member and the air in the air passage from abruptly changing in the air passage, and to cool the plurality of light sources uniformly.

  According to the fifth aspect, the heat radiating member has a heat radiating inclined surface that is exposed into the air passage and extends from the air flow upstream of the air passage to the air flow downstream. The heat radiation inclined surface is inclined with respect to the passage extending direction in which the air passage extends so as to face the air flow upstream of the air passage. This is the same in the sixth viewpoint.

  According to the seventh aspect, the plurality of light sources are arranged in the light source arrangement direction from the air flow upstream side of the air passage to the air flow downstream side. The heat dissipating member has an upstream heat dissipating fin protruding into the air passage and extending in the light source arrangement direction. In addition, the heat radiating member is disposed downstream of the air flow in the air passage with respect to the upstream heat radiating fin, protrudes into the air passage and extends in the direction in which the light sources are arranged, and an air flow provided in the air passage. With a guide. The airflow guide is arranged side by side with respect to the downstream radiation fins, so that the air flowing along the upstream radiation fins while moving away from the upstream radiation fins in the air passage is brought to the downstream radiation fin side. invite. This is the same in the eighth viewpoint.

  According to the ninth aspect, the heat radiating member includes a heat radiating plate having one surface connected to the plurality of light sources and another surface opposite to the one surface, and protruding from the other surface of the heat radiating plate into the air passage. And a radiation fin that is exposed. The heat radiation fin has a base end connected to the other surface of the heat radiation plate. At least one of the plurality of light sources is disposed at a position overlapping the base end of the radiation fin in the thickness direction of the radiation plate. Therefore, the heat of the light source disposed at a position overlapping with the base end of the heat radiation fin in the thickness direction of the heat radiation plate is easily transmitted to the heat radiation fin, and the light source is easily cooled.

  According to the tenth aspect, the air conditioning unit has a cooler that cools the air flowing through the unit passage in the air conditioning unit. The air passage has an inlet end on the air flow upstream side of the air passage. The inlet end of the air passage is located downstream of the air flow with respect to the cooler and communicates with a portion through which the air cooled by the cooler flows in the unit internal passage. Therefore, a plurality of light sources can be cooled by the air cooled by the cooler of the air conditioning unit. For example, the light source can be cooled by air-conditioning air whose temperature is adjusted by heating or the like in the air conditioning unit. It is possible to promote the cooling of

  According to the eleventh aspect, an air conditioning duct is provided in which a duct passage for guiding air flowing out of the air conditioning unit to a predetermined location in the vehicle compartment is formed. The air passage has an outlet end on the air flow downstream side of the air passage. The outlet end of the air passage communicates with the duct passage. Therefore, the air used for cooling the light source can be used for air conditioning in the vehicle interior.

  According to a twelfth aspect, a head-up display device includes an introduction-side pipe portion that guides air flowing out of an air conditioning unit to an air passage, and air that receives heat from a plurality of light sources in the air passage. And a discharge-side pipe portion that flows in from the outlet. And the introduction side pipe part, the passage forming part, and the discharge side pipe part are connected in series to constitute a pipe member. Therefore, it is possible to reduce the number of joints in the flow path of the air from the inlet side pipe to the outlet side pipe, and to easily prevent air leakage.

  According to a thirteenth aspect, the tube member has flexibility in at least a part of the tube member. Therefore, it is possible to easily perform piping of the tube member for cooling the light source.

10 HUD device (head-up display device)
12 air conditioning unit 22 passage forming part 22a cooling air passage (air passage)
30 heat dissipation member 201 light source

Claims (13)

A head-up display device for a vehicle that displays an image,
A plurality of light sources (201) for emitting display light for displaying the image;
A passage forming portion (22) formed with an air passage (22a) through which air flowing out of an air conditioning unit (12) for performing air conditioning in the vehicle compartment is provided;
A heat radiating member (30) communicably connected to the plurality of light sources and radiating heat of the plurality of light sources to air in the air passage;
The head-up display device, wherein the heat dissipating member is configured to easily dissipate heat to the air in the air passage toward an air flow downstream of the air passage.   The configuration in which the heat is more easily radiated to the air in the air passage toward the air flow downstream of the air passage means that the heat radiation area of the heat radiating member with respect to the air in the air passage is increased toward the air flow downstream of the air passage. The head-up display device according to claim 1, wherein The plurality of light sources are arranged in a light source arrangement direction (DRd) from an air flow upstream side of the air passage to an air flow downstream side,
The heat dissipating member has heat dissipating fins (302, 303, 304) protruding from the passage wall surface (301b) facing the air passage into the air passage and extending in the light source arrangement direction,
The protruding height (Hfn) of the radiating fins from the wall of the passage increases toward the downstream side of the air flow in the air passage, whereby the radiating area of the radiating member increases toward the downstream side of the air flow in the air passage. The head-up display device according to claim 2, wherein   4. The head-up display device according to claim 3, wherein the protruding height of the radiation fin gradually increases toward the downstream side of the air flow in the air passage. 5. The heat dissipating member has a heat dissipating inclined surface (301b) that is exposed into the air passage and extends from the air flow upstream of the air passage to the air flow downstream.
5. The heat radiation inclined surface according to claim 1, wherein the inclined surface is inclined with respect to a passage extending direction (DRc) in which the air passage extends so as to face an air flow upstream of the air passage. The head-up display device as described in the above. A head-up display device for a vehicle that displays an image,
A plurality of light sources (201) for emitting display light for displaying the image;
A passage forming portion (22) formed with an air passage (22a) through which air flowing out of an air conditioning unit (12) for performing air conditioning in the vehicle compartment is provided;
A heat radiating member (30) communicably connected to the plurality of light sources and radiating heat of the plurality of light sources to air in the air passage;
The heat dissipating member has a heat dissipating inclined surface (301b) that is exposed into the air passage and extends from the air flow upstream of the air passage to the air flow downstream.
The head-up display device, wherein the heat radiation inclined surface is inclined with respect to a passage extending direction (DRc) in which the air passage extends so as to face an air flow upstream of the air passage. The plurality of light sources are arranged in a light source arrangement direction (DRd) from an air flow upstream side of the air passage to an air flow downstream side,
The heat radiating member is configured to protrude into the air passage and extend in the direction in which the light sources are arranged, and an upstream heat radiating fin (303) is disposed on the air flow downstream of the air passage with respect to the upstream heat radiating fin. A heat radiation fin (304) protruding inward and extending in the direction in which the light sources are arranged, and an air flow guide (305) provided in the air passage;
The airflow guide is arranged side by side with respect to the downstream radiating fins, and separates air flowing along the upstream radiating fins from the upstream radiating fins in the air passage toward the downstream radiating fins. The head-up display device according to claim 1, wherein the head-up display device guides to approach. A head-up display device for a vehicle that displays an image,
A plurality of light sources (201) for emitting display light for displaying the image;
A passage forming portion (22) formed with an air passage (22a) through which air flowing out of an air conditioning unit (12) for performing air conditioning in the vehicle compartment is provided;
A heat radiating member (30) communicably connected to the plurality of light sources and radiating heat of the plurality of light sources to air in the air passage;
The plurality of light sources are arranged in a light source arrangement direction (DRd) from an air flow upstream side of the air passage to an air flow downstream side,
The heat radiating member is configured to protrude into the air passage and extend in the direction in which the light sources are arranged, and an upstream heat radiating fin (303) is disposed on the air flow downstream of the air passage with respect to the upstream heat radiating fin. A heat radiation fin (304) protruding inward and extending in the direction in which the light sources are arranged, and an air flow guide (305) provided in the air passage;
The airflow guide is arranged side by side with respect to the downstream radiating fins, and separates air flowing along the upstream radiating fins from the upstream radiating fins in the air passage toward the downstream radiating fins. A head-up display device that guides you to approach. The radiating member includes a radiating plate (301) having one surface (301a) connected to the plurality of light sources and another surface (301b) opposite to the one surface, and the air protruding from the other surface of the radiating plate. Radiation fins (302, 303, 304) exposed into the passage;
The radiation fin has a base end (302a, 303d, 304d) connected to the other surface of the radiation plate,
7. The device according to claim 1, wherein at least one of the plurality of light sources is arranged at a position overlapping a base end of the heat radiation fin in a thickness direction (DRe) of the heat radiation plate. 5. The head-up display device according to any one of the above. The air conditioning unit has a cooler (123) for cooling air flowing through a unit passage (122a) in the air conditioning unit,
The air passage has an inlet end (22b) on the air flow upstream side of the air passage,
The inlet end is located downstream of the air flow with respect to the cooler in the unit passage, and communicates with a portion (122e) through which the air cooled by the cooler flows. The head-up display device according to any one of the above. An air-conditioning duct (14) provided with a duct passage (14a) for guiding air flowing out of the air-conditioning unit to a predetermined location in the vehicle interior;
The air passage has an outlet end (22c) downstream of the air flow in the air passage;
The head-up display device according to any one of claims 1 to 10, wherein the outlet end communicates with the duct passage. An introduction-side pipe portion (24) for guiding air flowing out of the air conditioning unit to the air passage;
An outlet-side pipe portion (26) through which air heated by the plurality of light sources flows in the air passage from the air passage;
The head-up display device according to any one of claims 1 to 11, wherein the introduction-side tube portion, the passage forming portion, and the outlet-side tube portion are connected in series to form a tube member (28). .   The head-up display device according to claim 12, wherein the tube member has flexibility in at least a part of the tube member.

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