WO2019031519A1 - Head-up display - Google Patents

Abstract

This head-up display is applied to a moving body provided with: a windshield (3); an air conditioning unit (40) including a blowout opening portion (41a) for blowing out an airflow; and a blowout port (50) for blowing out the airflow from the blowout opening portion. The head-up display is provided with a light source (10) which emits display light for displaying information, and an optical path housing (20) forming an optical path (21) which causes the display light to propagate from the light source to the windshield. The display light that has passed along the optical path is projected onto the windshield, thereby displaying the information on the windshield. The head-up display is provided with an air conditioning duct (30) forming an airflow path which guides the airflow from the blowout opening portion to the blowout port. The light source is exposed within the airflow path of the air conditioning duct such that heat from the light source dissipates into the airflow path. The optical path housing and the air conditioning duct are configured in such a way that the airflow path and the optical path are separated by means of a mutually shared separating wall (32).

Description

Head-up display CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on Japanese Patent Application No. 2017-153384 filed on August 8, 2017, and Japanese Patent Application No. 2018-98072 filed on May 22, 2018, which are incorporated herein by reference. The contents of the description are incorporated by reference.

The present disclosure relates to a head-up display.

2. Description of the Related Art Conventionally, in a head-up display for an automobile (hereinafter referred to as HUD), there is one that cools a heat radiation component of the HUD by an air flow in an air conditioning duct (see, for example, Patent Document 1). The air conditioning duct constitutes a ventilation passage for flowing an air flow blown out from the indoor air conditioning system, and a branch duct for forming first and second branch passages for dividing the air flow in the ventilation passage.
The first air passage circulates the air flow from the air passage toward the outlet. The second air passage distributes the air flow toward the heat dissipation component of the HUD. For this reason, the heat dissipation component of the HUD can be cooled by the air flow in the second air passage.

JP, 2015-157575, A

The present inventors have studied to improve the mountability of mounting the air conditioning duct and the HUD in a mobile body such as a vehicle while maintaining the cooling performance.

An object of the present disclosure is to provide a head-up display in which the mountability to a mobile object is improved while maintaining the cooling performance.

According to one aspect of the present disclosure, the information is applied to a mobile body including a windshield, an air conditioning unit having a blowout opening for blowing out an air flow, and a blowout port for blowing out an air flow from the blowout opening. A light source for emitting display light for displaying and an optical path housing for forming an optical path for transmitting the display light from the light source to the windshield are provided, and the display light passing through the optical path is irradiated to the windshield and information is output to the windshield The head-up display for displaying the air conditioning duct includes an air conditioning duct forming an air flow path for guiding the air flow from the blowout opening to the air outlet, the light source is exposed in the air flow path of the air conditioning duct, and the light source is in the air flow path And the light path housing and the air conditioning duct are configured to separate the air flow path and the light path by the separation wall shared with each other. To have.

Therefore, since the gap between the light path housing and the air conditioning duct can be narrowed, the combined size of the light path housing and the air conditioning duct can be reduced. Therefore, the mountability to a mobile body can be improved.

Further, as described above, the light source is exposed in the air flow path of the air conditioning duct so that the light source dissipates heat into the air flow path. Therefore, the cooling performance of the light source can be maintained.

As described above, it is possible to provide a head-up display in which the mountability to a moving object is improved while maintaining the cooling performance.

Further, according to another aspect of the present disclosure, the light source includes a heat radiating portion which is exposed in the air flow passage and radiates heat into the air flow passage, and the main flow of the air flow in the air flow passage is The air flow direction is orthogonal to the air flow direction, and one predetermined direction is orthogonal to the air flow direction, and the heat dissipation portion is formed across the air flow direction and the orthogonal direction. The largest dimension is the first dimension, and the largest dimension in the orthogonal direction of the heat dissipation portions is the second dimension, and the heat dissipation portion is configured such that the first dimension is larger than the second dimension. .

Therefore, compared with the case where the first dimension is smaller than the second dimension, the heat dissipation area of the heat dissipation portion can be increased.

However, the main flow of the air flow is the air flow having the largest air volume among the plurality of air flows flowing through the air flow path.

The reference numerals in parentheses attached to each component, etc., shows an example of a relationship of the specific component such as described in the following embodiments and their components, and the like.

It is sectional drawing which looked at the internal structure of HUD for vehicles in 1st Embodiment from the vehicle width direction. It is the model which looked through the instrument panel in the HUD for vehicles and indoor air-conditioning unit in 1st Embodiment from the heavens and districts improvement side. It is the model which looked through the instrument panel in the HUD for vehicles and indoor air-conditioning unit in 2nd Embodiment from the heavens and districts improvement side. It is a figure which shows the arrangement | positioning relationship which looked the thermal radiation part of the light source of 2nd Embodiment, and the air-conditioning duct from the vehicle advancing direction front side. It is the schematic diagram which looked at the arrangement | positioning relationship between the light source of 2nd Embodiment and an optical path housing from the heavens and districts improvement side. FIG. 10 is a view of the entire configuration of the vehicle in the second embodiment as viewed from the heavenly region improvement side, and in particular, a diagram as viewed from the heavenly region improvement side in the arrangement relationship between reinforcement and light sources. It is a figure which shows the connection relation of the air-conditioning duct of 2nd Embodiment. It is a figure which shows the connection relation of the air-conditioning duct of the modification of 2nd Embodiment. It is a figure which shows the position of the door of the cold wind mode of 3rd Embodiment. It is a figure which shows the position of the door of warm-warm mode of 3rd Embodiment. It is a figure which shows the electric constitution of 3rd Embodiment. It is a flowchart which shows the door control processing of the electronic control unit of 3rd Embodiment. It is a figure which shows the arrangement | positioning relationship of the light source of another embodiment, and an optical path housing.

Hereinafter, embodiments of the present disclosure will be described based on the drawings. In the following embodiments, parts identical or equivalent to each other are denoted by the same reference numerals in the drawings in order to simplify the description.

First Embodiment
The vehicle HUD 1 of the present embodiment includes a light source 10, an optical path housing 20, and an air conditioning duct 30, as shown in FIGS.

The light source 10, together with the optical path housing 20, constitutes a known head-up display and emits display light for displaying various types of information. The light source 10 includes a display unit, a light emitting element, and a drive circuit for driving the light emitting element. The light source 10 is disposed below the instrument panel 2 on the front side in the vehicle traveling direction in the vehicle compartment of the automobile. The light source 10 of the present embodiment is disposed closer to the driver's seat than the center in the vehicle width direction.

The instrument panel 2 is a panel equipped with various meters in an automobile, and is disposed below the front windshield 3 in the top-bottom direction, and is disposed in front of the driver's seat and the passenger's seat in the vehicle traveling direction ing.

The optical path housing 20 is disposed below the opening 2 a of the instrument panel 2. The opening 2 a of the instrument panel 2 is provided below the front windshield 3 in the vertical direction and on the front side of the light source 10 in the vehicle traveling direction.

The optical path housing 20 is made of a light shielding resin material or the like, and constitutes the optical path 21 and the opening 22. The opening 22 is opened toward the inner surface of the front windshield 3 through the opening 2 a of the instrument panel 2.

In the opening 22, a window 22a made of a transparent material such as a transparent resin is fitted. In the optical path 21, a reflecting mirror 23 for reflecting display light from the light source 10 and guiding it to the window 22a is disposed. The window 22 a is provided to prevent dust from entering the optical path housing 20.

In the present embodiment, the light source 10 is disposed on the rear side in the vehicle traveling direction with respect to the light path housing 20. The light source 10 is arranged next to the light path housing 20.

The air conditioning duct 30 is disposed below the instrument panel 2 and rearward of the light path housing 20 in the vehicle traveling direction. The air conditioning duct 30 constitutes an air flow path 31 for guiding the cold air blown out from the blowout opening 41 a of the in-room air conditioning unit 40 to the side face air outlet 50.

In the present embodiment, in the air conditioning duct 30, the air flow path 31 does not form a branch flow path for dividing cold air blown out from the blowout opening 41a of the vehicle interior air conditioning unit 40. In other words, the air conditioning duct 30 is a duct in which the air flow path 31 is not branched.

Thus, in the air conditioning duct 30, the air flow passage 31 is configured such that all the cold air from the blowout opening 41a passes through the air flow passage 31. For this reason, regardless of when the light source 10 is activated or stopped, cold air from the blowout opening 41 a flows in the air flow passage 31.

Note that the air conditioning duct of Patent Document 1 forms a ventilation passage for flowing an air flow blown out from the blowout opening of the indoor air conditioner, and first and second branch passages for dividing the air flow in the ventilation passage. There is. The heat dissipation component of the HUD is cooled by the air flow in the second air passage among the first and second branch passages. For this reason, although a part of the air flow from the blowout opening flows into the second ventilation passage, the whole air flow from the blowout opening does not flow into the second ventilation passage.

The light source 10 is disposed in the air conditioning duct 30. More specifically, portions of the light source 10 other than the light emitting portion are enclosed by the air flow path 31. In the present embodiment, portions of the light source 10 other than the light emitting portion are exposed in the air flow path 31. That is, the portion of the light source 10 other than the light emitting portion is exposed in the air flow path 31.

In the air conditioning duct 30, a light guide path 30a for guiding display light from the light source 10 to the light path 21 in the light path housing 20 is formed. The light guide path 30 a is formed by the light guide tube 37. The light guide tube 37 is provided between the light emitting portion of the light source 10 and the light path 21.

The air conditioning duct 30 and the light path housing 20 of the present embodiment include separation walls 32 shared with each other. The separation wall 32 constitutes a wall that separates the air flow path 31 and the light path 21. The light guide tube 37 is shared by the air conditioning duct 30 and the light path housing 20.

An air conditioning duct 33 as an upstream duct is disposed between the air inlet of the air conditioning duct 30 and the blowout opening 41 a of the vehicle interior air conditioning unit 40. The air inlet of the air conditioning duct 33 is connected to the blowout opening 41a. The air outlet of the air conditioning duct 33 is connected to the air inlet of the air conditioning duct 30.

An air conditioning duct 34 as a downstream side duct is disposed between the air outlet of the air conditioning duct 30 and the side face air outlet 50. The air outlet of the air conditioning duct 30 is connected to the air inlet of the air conditioning duct 34. The air outlet of the air conditioning duct 34 is connected to the side face outlet 50. The side face outlet 50 is disposed at one side in the vehicle width direction with respect to the center in the vehicle width direction of the instrument panel 2 and is a outlet that blows cold air toward the upper body of the occupant in the vehicle interior.

Here, one side in the vehicle width direction means the side on which the driver's seat is disposed on the right and left sides in the vehicle width direction. Therefore, when the driver's seat is disposed on the right side in the vehicle width direction, the side face air outlet 50 is disposed on the right side in the vehicle width direction than the central portion in the vehicle width direction. When the driver's seat is disposed on the left side in the vehicle width direction, the side face air outlet 50 is disposed on the left side in the vehicle width direction than the central portion in the vehicle width direction.

The light path housing 20, the air conditioning duct 30, and the light guide tube 37 of the present embodiment are integrally formed of a light shielding resin material. That is, the light path housing 20 and the air conditioning duct 30 are configured as an integrally molded product formed of a light shielding resin material.

As a result, it is possible to prevent display light from leaking to the outside from a portion other than the window 22a in the light path housing 20 and to prevent light as disturbance from entering the inside of the light path housing 20 from the outside.

The cabin air conditioning unit 40 introduces the cabin air or the cabin outside air, adjusts the temperature of the introduced air flow, and uses the temperature-controlled air flow as cold air, a plurality of blowout openings including the blowout opening 41a. It is a well-known vehicle interior air conditioning unit which blows off from a part.

The plurality of blowout openings include a face blowout opening 41b, a front passenger seat side face blowout opening 41c, a foot blowout opening (not shown), a defroster blowout opening (not shown), and the like.

Next, the operation of the vehicle head-up display 1 of the present embodiment will be described.

First, when the light source 10 emits display light, the emitted display light travels to the light path 21 through the light guide path 30a. The display light propagates in the light path 21. At this time, the display light is reflected by the reflecting mirror 23, and the reflected display light passes through the window 22a and the opening 2a.

Thus, the display light that has passed through the light path 21, the window 22 a and the opening 2 a is irradiated to the front windshield 3. For this reason, various information based on the display light is displayed on the front windshield 3. As a result, various information is visually recognized as a virtual image by the driver.

At this time, the light source 10 generates heat as the display light is emitted. On the other hand, cold air is blown out from the blowout opening 41 a of the cabin air conditioning unit 40. This cold air blows out from the side face air outlet 50 into the vehicle compartment through the air conditioning ducts 33, 30, 34.

Here, locations other than the light emitting portion of the light source 10 are exposed in the air flow path 31 of the air conditioning duct 30. Therefore, the light source 10 radiates heat to the cold air in the air flow path 31. Thereby, the light source 10 is cooled by the cold air.

According to the embodiment described above, the HUD 1 for a vehicle includes the front windshield 3, an air conditioning unit 40 having a blowout opening 41a for blowing cold air, and a side face blowout 50 for blowing cold air from the blowout opening 41a. , Has been applied to the car.

The HUD 1 for a vehicle includes a light source 10 for emitting display light, and an optical path housing 20 forming an optical path 21 through which the display light is transmitted from the light source 10 to the head-up display 1. The vehicle HUD 1 causes the front windshield 3 to emit display light that has passed through the light path 21 and causes the front windshield 3 to display information.

The HUD 1 for vehicle includes an air conditioning duct 30 forming an air flow path 31 for guiding the cold air from the blowout opening 41 a to the side face air outlet 50. At least a part of the light source 10 is exposed in the air flow path 31 of the air conditioning duct 30, and the light source 10 radiates heat to the cold air of the air flow path 31. For this reason, the light source 10 is cooled by the cold air of the air flow path 31. The light path housing 20 and the air conditioning duct 30 are configured to separate the air flow path 31 and the light path 21 by a separation wall 32 shared with each other.

Thus, the gap between the light path housing 20 and the air conditioning duct 30 can be eliminated. For this reason, compared with the case where the light path housing 20 and the air conditioning duct 30 are configured independently, the combined size of the light path housing 20 and the air conditioning duct 30 can be reduced. Thus, the mountability of the light path housing 20 and the air conditioning duct 30 on a vehicle can be improved while maintaining the cooling performance for cooling the light source 10.

In the present embodiment, the air conditioning duct 30 is a duct in which the air flow path 31 is not branched. For this reason, the air conditioning duct 30 of the present embodiment can be reduced in size as compared to the branch duct forming the branch flow path. Thus, the mountability of the light path housing 20 and the air conditioning duct 30 on a vehicle can be further improved.

In the present embodiment, the light source 10 is exposed in the air flow path 31 of the air conditioning duct 30, and the light source 10 is directly cooled by the cold air of the air flow path 31. Therefore, the cooling performance of the light source 10 can be improved. Therefore, the light source 10 in a high temperature state can be cooled in a short time. By this, in order to protect the electronic circuit which comprises the light source 10 at the time of high temperature, the protection period which limits light emission of the light source 10 can be shortened. Therefore, the brightness of the light source 10 in the high temperature state can be improved.

In the present embodiment, as described above, since the light source 10 is directly cooled by the cold air of the air flow path 31, the heat radiation of the cooling component (specifically, Peltier element) for cooling the light source 10 or the light source 10 is promoted. No radiation fins are used. Therefore, the cooling configuration for cooling the light source 10 can be further simplified.

In the above-mentioned patent documents, a branch duct is adopted as an air conditioning duct, and further, accessories such as a door and an actuator for opening and closing a branch flow path for cooling a heat radiating portion of a light source are adopted.

On the other hand, the air conditioning duct 30 of the present embodiment is a duct in which the air flow path 31 is not branched. Therefore, there is no need for accessories such as a door and an actuator for opening and closing the branch flow path. Therefore, since the accessories attached to the air conditioning duct 30 are also simplified, cost increase can be suppressed.

Second Embodiment
In the first embodiment, the light source 10 is disposed adjacent to the light path housing 20 on the rear side in the vehicle traveling direction, but instead, the light source 10 and the light path housing 20 are adjacent in the vehicle width direction A second embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a perspective view of the vehicle HUD 1 of the present embodiment as seen through the instrument panel 2 from the heavenly region improvement side. In FIG. 3, the same reference numerals as those in FIG. 1 denote the same components, and a description thereof will be omitted.

The main difference between this embodiment and the first embodiment is the location of the light source 10. Hereinafter, the arrangement location of the light source 10 which is the main difference will be described, and the description of the other configuration will be simplified.

The light source 10 of this embodiment is arranged on the other side in the vehicle width direction with respect to the light path housing 20. More specifically, the light source 10 is disposed next to the air conditioning duct 30. The other side in the vehicle width direction means the side on which the front passenger seat is disposed among the right and left sides in the vehicle width direction.

A light guide tube 37 is disposed between the light source 10 and the optical path housing 20 of the present embodiment, as in the first embodiment. As a result, a light guide path 30 a for guiding display light from the light source 10 to the light path 21 in the light path housing 20 is formed between the light source 10 and the light path housing 20. The light path housing 20 of the present embodiment includes a window 22a disposed in the opening 22 as in the first embodiment, although not shown.

Here, the light source 10 is disposed forward of the air conditioning duct 30 in the vehicle traveling direction. The air conditioning duct 30 is disposed on the rear side in the vehicle traveling direction with respect to the light source 10 and the light path housing 20.

The light source 10 includes a display unit, a light emitting element, and a heat radiating unit 11 for radiating heat generated from a drive circuit or the like. The heat radiating portion 11 is disposed on the rear side in the vehicle traveling direction of the light source 10. The heat radiating portion 11 constitutes a heat radiating surface exposed in the air flow passage 31 of the air conditioning duct 30. The heat dissipation unit 11 and the air conditioning duct 30 constitute an air flow passage 31.

The arrangement | positioning relationship which looked at the thermal radiation part 11 and the air-conditioning duct 30 of this embodiment from the vehicle advancing direction front side at FIG. 4 is shown.

First, the flow direction of the main flow of the air flow in the air flow path 31 of the air conditioning duct 30 is taken as the air flow direction. The one predetermined direction which is orthogonal to the air flow direction and which is determined in advance is taken as the orthogonal direction. The mainstream refers to the air flow having the largest air volume among the plurality of air flows in the air conditioning duct 30.

Here, the heat radiating portion 11 constitutes a heat radiating surface which spreads in the direction perpendicular to the air flow direction. The dimension of the heat radiating portion 11 that is largest in the air flow direction is referred to as a dimension Ln. The dimension which becomes largest in the orthogonal direction among the heat dissipation parts 11 is referred to as a dimension Lt.

The air flow direction in the present embodiment is the vehicle width direction, and the orthogonal direction is the vehicle traveling direction.

The heat dissipation unit 11 is configured such that the dimension Ln is larger than the dimension Lt. By this, the heat dissipation area of the heat dissipation part 11 can be enlarged.

The arrangement | positioning relationship which looked the light source 10 and the optical path housing 20 of this embodiment in FIG. 5 from the heavens and districts improvement side is shown.

The end of the light path housing 20 located on the front side in the vehicle traveling direction is the front end 20a, and the end of the light path housing 20 located on the rear side in the vehicle traveling direction is the rear end 20b. The end of the light source 10 located on the front side in the vehicle traveling direction is the front end 10a, and the end of the light source 10 located on the rear side in the vehicle traveling direction is the rear end 10b.

The front end 10 a of the light source 10 is disposed at the same position as the front end 20 a of the light path housing 20 in the vehicle traveling direction. The rear end 10b of the light source 10 is disposed forward of the rear end 20b of the light path housing 20 in the traveling direction of the vehicle.

The light source 10 is fixed to the reinforce 4 as shown in FIG. By this, the light source 10 is supported by the reinforce 4. The reinforcement 4 is a beam member made of a metal material and formed to extend in the vehicle width direction.

The reinforcement 4 is disposed below the instrument panel 2 in the vertical direction. The reinforcement 4 is disposed on the rear side in the vehicle traveling direction with respect to the firewall 9 and on the front side in the vehicle traveling direction with respect to the steering 8, the driver's seat 6a, and the front passenger seat 6b. The firewall 9 is a wall that divides the engine room and the vehicle room 7 from each other.

The right end portion of the reinforcement 4 located on the right side of the vehicle width direction central portion S1 is fixed to the chassis 5a of the vehicle. The chassis 5a is disposed to the right of the vehicle width direction central portion S1 of the vehicle. The left end portion of the reinforce 4 located on the left side of the vehicle width direction central portion S1 is fixed to the chassis 5b of the vehicle.

The chassis 5a is disposed to the left of the vehicle width direction central portion S1 of the vehicle. The chassis 5a and 5b respectively constitute a framework of the vehicle. By this, the reinforce 4 plays a role of reinforcing the chassis 5a, 5b.

The air conditioning duct 30 of the present embodiment is a duct in which the air flow passage 31 is not branched as in the first embodiment. As in the first embodiment, the air conditioning duct 30 and the light path housing 20 of the present embodiment separate the air flow path 31 and the light path 21 by the separation wall 32 shared with each other.

FIG. 7 is a view showing the connection relationship of the air conditioning ducts 30, 33, 34 of the second embodiment. As shown in FIG. 7, the air conditioning duct 33 is disposed between the air inlet of the air conditioning duct 30 of the present embodiment and the blowout opening 41a of the vehicle interior air conditioning unit 40 as in the first embodiment. There is. The air inlet of the air conditioning duct 33 is connected to the blowout opening 41a. The air outlet of the air conditioning duct 33 is connected to the air inlet of the air conditioning duct 30.

An air conditioning duct 34 is disposed between the air outlet of the air conditioning duct 30 and the side face air outlet 50, as in the first embodiment. The air outlet of the air conditioning duct 30 is connected to the air inlet of the air conditioning duct 34. The air outlet of the air conditioning duct 34 is connected to the side face outlet 50.

Next, the operation of the vehicle head-up display 1 of the present embodiment will be described.

First, display light emitted from the light source 10 travels to the light path 21 through the light guide path 30 a. The display light propagates in the light path 21. At this time, the display light is reflected by the reflecting mirror 23, and the reflected display light passes through the window 22a and the opening 2a. This passing display light is irradiated to the front windshield 3. Therefore, various information based on the display light is displayed on the front windshield 3.

At this time, the light source 10 generates heat as the display light is emitted. The heat radiating portion 11 of the light source 10 of the present embodiment is exposed in the air flow path 31 of the air conditioning duct 30. For this reason, the light source 10 radiates heat from the heat radiating portion 11 to the cold air in the air flow path 31. Thereby, the thermal radiation part 11 of the light source 10 is directly cooled by cold wind.

According to the present embodiment described above, the heat radiating portion 11 of the light source 10 is exposed in the air flow passage 31 of the air conditioning duct 30, and the heat radiating portion 11 of the light source 10 radiates heat to the cold air in the air flow passage 31. become. Thereby, the light source 10 is cooled by the cold air. In addition to this, the light path housing 20 and the air conditioning duct 30 are configured to separate the air flow path 31 and the light path 21 by means of a separation wall 32 shared with each other.

As described above, according to the present embodiment, as in the first embodiment, compared with the case where the light path housing 20 and the air conditioning duct 30 are configured independently, the combined size of the light path housing 20 and the air conditioning duct 30 is reduced. can do. Thus, the mountability of the light path housing 20 and the air conditioning duct 30 on a vehicle can be improved while maintaining the cooling performance for cooling the light source 10.

In the present embodiment, the air conditioning duct 30 is a duct in which the air flow passage 31 does not form a branch flow passage for dividing cold air from the blowout opening 41a, as in the first embodiment. For this reason, since the physique of the air conditioning duct 30 can be miniaturized, the mountability to the automobile in the light path housing 20 and the air conditioning duct 30 can be further improved.

In the present embodiment, the heat dissipation unit 11 is configured such that the dimension Ln (see FIG. 4) is larger than the dimension Lt. By this, the heat dissipation area of the heat dissipation part 11 can be enlarged. Thus, the cooling performance of the light source 10 can be further improved.

In the present embodiment, the light source 10 is disposed on the other side in the vehicle width direction with respect to the light path housing 20. The light source 10 is arranged next to the light path housing 20. As a result, compared to the case where the light path housing 20 and the light source 10 are disposed apart in the vehicle width direction, the size in the vehicle width direction of the physical size of the light path housing 20 and the light source 10 can be reduced.

In the present embodiment, the front end 10 a of the light source 10 is disposed rearward of the front end 20 a of the light path housing 20 in the vehicle traveling direction. Thereby, compared with the case where front end 10a of light source 10 is positioned forward of front end 20a of light path housing 20 in the vehicle movement direction, the dimension Lz of the body in the vehicle movement direction of the combined optical path housing 20 and light source 10 Can be made smaller.

In the present embodiment, the rear end 10b of the light source 10 is disposed at the same position as the rear end 20b of the light path housing 20 in the vehicle traveling direction. Thus, the traveling direction of the vehicle in which the light path housing 20 and the light source 10 are combined is greater than when the rear end 10b of the light source 10 is positioned rearward of the rear end 20b of the light path housing 20 in the vehicle traveling direction. Can be reduced.

(Modification)
FIG. 8 is a view showing a connection relationship of the air conditioning ducts 30 and 34 according to a modification of the second embodiment. In the second embodiment, an example in which the air conditioning ducts 30, 33, 34 are formed independently is described, but instead, as shown in FIG. What is comprised as an integral molding may be employ | adopted.

In this case, the air inlet of the air conditioning duct 33 is connected to the blowout opening 41 a of the cabin air conditioning unit 40. The air outlet of the air conditioning duct 30 is connected to the air inlet of the air conditioning duct 34. The air outlet of the air conditioning duct 34 is connected to the side face outlet 50.

Furthermore, in the second embodiment, the air conditioning ducts 30 and 34 may be configured as an integrally molded article.

Third Embodiment
In the third embodiment, an example in which a bypass flow passage 31a for bypassing the heat dissipation portion 11 with the air flow from the blowout opening 41a of the vehicle interior air conditioning unit 40 in the first embodiment is added to FIGS. It demonstrates using FIG. 11, FIG. 12 grade | etc.,.

In the present embodiment, a bypass flow passage 31a and a door 60 are added to the vehicle HUD 1 of the first embodiment. 9 and 10, the same reference numerals as in FIGS. 1 and 2 indicate the same components, and the description thereof will be omitted.

The bypass flow passage 31 a of the present embodiment is provided in the air conditioning duct 30. The bypass flow passage 31 a is an air flow passage for bypassing the heat radiating portion 11 and guiding the air flow blown out from the blowout opening 41 a of the vehicle interior air conditioning unit 40 to the side face air outlet 50.

Specifically, the air conditioning duct 30 is provided with a branch portion 31 b that diverts the air flow from the blowout opening 41 a of the in-room air conditioning unit 40 into the air flow path 31 and the bypass flow path 31 a.

The air flow path 31 is an air flow path for guiding the air flow blown out from the blowout opening 41 a of the in-room air conditioning unit 40 to the heat dissipation unit 11.

Further, on the downstream side in the air flow direction with respect to the heat radiating portion 11 in the air conditioning duct 30, there is provided a merging portion 31c for merging the air flow passing through the air flow passage 31 and the air flow passing through the bypass flow passage 31a. It is done.

The branch portion 31b of the air conditioning duct 30 of the present embodiment is provided with a door 60 for adjusting the ratio of the air volume flowing from the outlet opening 41a to the air channel 31 and the volume flowing from the outlet opening 41a to the bypass channel 31a. ing.

The door 60 is rotatably supported by the air conditioning duct 30, and closes one of the air flow passage 31 and the bypass flow passage 31a and opens the other flow passage. The door 60 is rotationally driven by the electric actuator 62.

As the electric actuator 62, various electric actuators such as a direct current motor, an alternating current motor, and a stepping motor are used.

The electric actuator 62 of the present embodiment is controlled by the electronic control unit 64. The electronic control unit 64 is configured by a microcomputer, a memory, and the like. The electronic control unit 64 executes door control processing in accordance with a computer program stored in advance in a memory. A memory is a non-transitory tangible storage medium.

The electronic control device 64 controls the door 60 via the electric actuator 62 based on the temperature detected by the temperature sensor 66 in accordance with the execution of the door control process. The temperature sensor 66 is a temperature sensor that detects the temperature of the air flow blown out from the blowout opening 41 a of the vehicle interior air conditioning unit 40.

The temperature sensor 66 according to the present embodiment is disposed in the air conditioning duct 30 near the blowout opening 41 a.

Next, the operation of the vehicle HUD 1 of the present embodiment will be described with reference to FIGS. 9, 10, 12 and the like.

FIG. 12 is a flowchart showing the details of the door control process in the electronic control unit 64.

The electronic control unit 64 executes the door control process according to the flowchart of FIG. The door control process is repeatedly performed by the electronic control unit 64.

First, in step S100, the electronic control unit 64 determines that the temperature of the air flow blown out from the blowout opening 41a of the vehicle interior air conditioning unit 40 is higher than a threshold (for example, 50 ° C.) based on the temperature detected by the temperature sensor 66. It is determined whether the

At this time, if the temperature of the air flow blown out from the blowout opening 41a of the in-room air conditioning unit 40 is equal to or higher than the threshold, the electronic control unit 64 determines YES in step S100.

Along with this, the electronic control unit 64 controls the door 60 through the electric actuator 62 to execute the warm-up mode. As a result, the air passage 31 is fully closed by the door 60, and the bypass passage 31a is fully opened by the door 60 (see FIG. 10).

As a result, the amount of air flowing from the blowout opening 41 a of the vehicle interior air conditioning unit 40 to the bypass flow passage 31 a can be made larger than the amount of air flowing from the blowout opening 41 a to the heat radiating portion 11.

Specifically, it is possible to stop the flow of the high temperature air from the blowout opening 41 a of the in-room air conditioning unit 40 into the heat radiating portion 11. In addition to this, all of the high temperature air flow blown out from the blowout opening 41a passes through the branch portion 31b, the bypass flow passage 31a, and the merging portion 31c as shown by the arrow Rb in FIG. Can be

Therefore, it is possible to prevent in advance that the heat radiation of the heat radiating portion 11 is hindered by the high temperature air flow blown out from the blowout opening 41 a of the vehicle interior air conditioning unit 40 and the light source 10 is disturbed.

On the other hand, when the temperature of the air flow blown out from the blowout opening 41a of the cabin air conditioning unit 40 is less than the threshold, the electronic control unit 64 determines NO in step S100.

Along with this, the electronic control unit 64 controls the door 60 through the electric actuator 62 to execute the cold air mode. As a result, the air passage 31 is fully opened by the door 60, and the bypass passage 31a is completely closed by the door 60 (see FIG. 9).

As a result, the amount of air flowing from the blowout opening 41a to the heat radiating portion 11 can be made larger than the bypass flow passage 31a from the blowout opening 41a of the vehicle interior air conditioning unit 40.

Specifically, it is possible to stop the low temperature air flow from the blowout opening 41 a of the in-room air conditioning unit 40 from flowing to the heat dissipation unit 11. In addition to this, a low temperature air flow blown out from the blowout opening 41a can be made to flow to the side face blowout port 50 through the air flow path 31 as shown by arrow Ra in FIG.

Therefore, the air flow blown out from the blowout opening 41 a of the in-room air conditioning unit 40 flows to the heat dissipation unit 11. Therefore, the heat radiating portion 11 can be favorably dissipated by the air flow blown out from the blowout opening 41 a of the in-room air conditioning unit 40.

According to the embodiment described above, in the vehicle HUD 1, the air conditioning duct 30 is provided with the bypass flow passage 31 a that bypasses the heat dissipation portion 11 with the air flow from the blowout opening 41 a.

The door 60 adjusts the ratio of the amount of air flowing from the blowout opening 41 a through the air flow channel toward the heat dissipation unit 11 and the amount of air flowing from the blowout opening 41 a to the bypass flow passage 31 a.

When the electronic control device 64 determines that the temperature of the air flow from the blowout opening 41a is equal to or higher than the threshold value, the electronic control device 64 controls the door 69 via the electric actuator 62 as follows.

That is, the electronic control device 64 fully closes the air flow passage 31 by the door 60 and fully opens the bypass flow passage 31 a by the door 60.

As a result, the amount of air flowing from the blowout opening 41 a to the bypass flow passage 31 a becomes larger than the amount of air flowing from the blowout opening 41 a toward the heat dissipation unit 11. For this reason, it is possible to suppress the flow of the high temperature air flow to the heat dissipation unit 11.

For this reason, it is possible to prevent in advance that the heat radiation of the light source 10 is hindered by the high temperature air flow and the light source 10 is disturbed. That is, failure of the light source 10 can be prevented in advance.

On the other hand, when it is determined that the temperature of the air flow from the blowout opening 41a is less than the threshold value, the electronic control unit 64 controls the door 69 via the electric actuator 62 as follows.

That is, the electronic control device 64 fully opens the air flow passage 31 by the door 60 and fully closes the bypass flow passage 31 a by the door 60.

As a result, the amount of air flowing from the blowout opening 41a toward the heat dissipation portion 11 is larger than the amount of air flowing from the blowout opening 41a to the bypass flow passage 31a. For this reason, since a large amount of low temperature air flow can be made to flow toward the heat dissipation portion 11, a large amount of heat can be released from the heat dissipation portion 11 to the air flow.

As described above, the door 60 can be appropriately controlled via the electric actuator 62 based on the temperature of the air flow from the blowout opening 41a. Therefore, it is possible to prevent a failure in the light source 10 while well radiating the heat from the light source 10 through the heat radiating portion 11.

(Other embodiments)
(1) In the first, second, third embodiment and the modification, the head up display 1 for displaying information on the front windshield 3 has been described. However, the present invention is not limited to this, and the head-up display 1 may be one that displays information on the side windshield. Alternatively, the head-up display 1 may be one that displays information on the rear windshield.

(2) In the first, second, third embodiment and the modification described above, the head-up display 1 is applied to a car, but instead, an airplane other than a car, a train, a train, a ship, etc. The head-up display 1 may be applied to a mobile object of

(3) In the first, second, third embodiment and the modification described above, an example using the side face outlet 50 for blowing cold air into the vehicle compartment as the outlet for blowing cold air having passed through the air conditioning duct 30 has been described. However, instead of this, the following (a) and (b) may be made.

(A) A blower outlet for blowing cold air out of the vehicle is used as a blower outlet for blowing cold air that has passed through the air conditioning duct 30.

(B) A face outlet, a foot outlet, and a defroster outlet other than the side face outlet may be used as an outlet for blowing the cold air that has passed through the air conditioning duct 30.

(4) In the second embodiment and the modification, an example in which the front end 10a of the light source 10 is disposed rearward of the front end 20a of the light path housing 20 in the vehicle traveling direction has been described. However, the present invention is not limited to this, and the front end 10a of the light source 10 may be disposed at the same position as the front end 20a of the light path housing 20 in the vehicle traveling direction (see FIG. 13).

Furthermore, in the second embodiment and the modification, an example in which the rear end 10b of the light source 10 is disposed at the same position as the rear end 20b of the light path housing 20 in the vehicle traveling direction has been described. However, the rear end 10b of the light source 10 may be disposed on the front side of the rear end 20b of the light path housing 20 in the vehicle traveling direction.

As described above, the dimension Lz in the vehicle traveling direction of the physical combination of the light path housing 20 and the light source 10 can be reduced.

(5) In the second embodiment and the modification, the example in which the light source 10 is disposed on the other side in the vehicle width direction with respect to the light path housing 20 has been described. However, instead of this, the light source 10 may be disposed on one side in the vehicle width direction with respect to the light path housing 20.

(6) In the first, second, third embodiment and the modification, one reflecting mirror 23 is adopted to guide display light from the light source 10 to the front windshield 3. However, the present invention is not limited to this. A plurality of reflecting mirrors 23 may be disposed in the light path housing 20 to guide display light from the light source 10 to the front windshield 3.

(7) In the first, second, third embodiment and the modifications described above, the cooling parts for cooling the light source 10 and the radiation fins for promoting the heat radiation of the light source 10 are not used. , Cooling parts and radiation fins may be used.

(8) In the first, second, third embodiment and the modification described above, the light source 10 and the optical path housing 20 are offset from each other. However, the present invention is not limited thereto. It may be configured to be enclosed by the housing 20.

(9) In the first, second, third embodiment and the modification, the cold air is circulated in the air flow path 31 of the air conditioning duct 30 to cool the light source 10 by the cold air. May be as follows. That is, the light source 10 may be cooled by the in-room air or the out-of-room air that is circulated in the air flow path 31 of the air conditioning duct 30 without adjusting the temperature of the cabin air or the cabin outdoor air.

(10) In the third embodiment, when the temperature of the air flow from the blowout opening 41a of the cabin air conditioning unit 40 is equal to or higher than the threshold, the air flow path 31 is fully closed by the door 60, and the door The example which makes the bypass flow path 31a fully open by 60 has been described.

However, the present invention is not limited to this, and the air flow path 31 may be opened slightly by the door 60 if the air flow from the blowout opening 41a to the bypass flow passage 31a is larger than the air flow from the blowout opening 41a to the heat dissipation unit 11. It is also good.

Furthermore, in the case where the temperature of the air flow from the blowout opening 41 a is less than the threshold, the example in which the air flow path 31 is fully opened by the door 60 and the bypass flow path 31 a is fully closed by the door 60 has been described.

However, the present invention is not limited to this, and if the amount of air flowing from the blowout opening 41a to the heat dissipation portion 11 is larger than the amount of air flowing from the blowout opening 41a to the bypass flow passage 31a, the door 60 slightly opens the bypass flow passage 31a. It is also good.

(11) In the third embodiment described above, the temperature sensor 66 is used to detect the temperature of the air flow blown out from the blowout opening 41a of the in-room air conditioning unit 40. Thus, the following (c) (d) may be performed.

(C) The temperature of the air flow blown out from the blowout opening 41a may be determined based on the target blowout air temperature TAO used for control processing of the blowout air temperature in the passenger compartment air conditioning unit 40.

(D) Instead of using the temperature sensor 66, the temperature of the air flow blown out from the blowout opening 41a of the vehicle interior air conditioning unit 40, the detected value of the inside air temperature sensor for detecting the temperature in the vehicle interior It is estimated according to various information such as the set temperature. The estimated air flow temperature may be used in the determination process of step S100.

(12) In the third embodiment, the example in which 50 ° C. is used as the threshold value used to determine the temperature of the air flow blown out from the blowout opening 41 a of the vehicle interior air conditioning unit 40 in step S100 is described. . However, instead of this, a temperature other than 50 ° C. may be used as the threshold.

(13) Note that the present disclosure is not limited to the above-described embodiment, and may be modified as appropriate. Moreover, said each embodiment is not mutually irrelevant and can be combined suitably, unless the combination is clearly impossible. Further, in each of the above-described embodiments, it is needless to say that the elements constituting the embodiment are not necessarily essential except when clearly indicated as being essential and when it is considered to be obviously essential in principle. Yes. Further, in the above embodiments, when numerical values such as the number, numerical value, amount, range, etc. of constituent elements of the embodiment are mentioned, it is clearly indicated that they are particularly essential and clearly limited to a specific number in principle. It is not limited to the specific number except when it is done. Further, in the above embodiments, when referring to the shape, positional relationship, etc. of the component etc., unless otherwise specified or in principle when limited to a specific shape, positional relationship, etc., the shape, etc. It is not limited to the positional relationship and the like.

(Summary)
According to a first aspect described in the first, second, third embodiment, and part or all of the other embodiments, the head-up display includes a windshield and a blowout opening for blowing out an air flow. The present invention is applied to a moving body provided with an air conditioning unit having the following formula and an air outlet for blowing out the air flow from the air outlet.

The head-up display includes a light source for emitting display light for displaying information, and an optical path housing for forming an optical path for propagating the display light from the light source to the windshield, and the display light passing through the optical path is used for the windshield. It is illuminated and causes the windshield to display information.

The head-up display includes an air conditioning duct that forms an air flow path that guides the air flow from the blowout opening to the outlet, and the light source is exposed in the air flow path of the air conditioning duct and the light source dissipates heat in the air flow path As such, the light path housing and the air conditioning duct are configured to separate the air flow path and the light path by means of separation walls that share each other.

According to a second aspect, the light source is arranged next to the light path housing.

Here, the direction in which the light sources and the optical path housings are aligned is taken as the alignment direction. For this reason, compared with the case where the light source and the light path housing are disposed apart from each other, the dimension in the direction in which the light source and the light path housing are combined can be reduced.

According to the third aspect, the light source is provided with a heat radiating portion which is exposed in the air flow path and radiates heat into the air flow path. The main flow direction of the air flow in the air flow path is taken as the air flow direction, orthogonal to the air flow direction, and one predetermined direction is taken as the orthogonal direction.

The heat dissipation portion is formed in the air flow direction and in the orthogonal direction. The largest dimension in the air flow direction of the heat radiating portion is the first dimension, the largest dimension in the orthogonal direction of the heat radiating portion is the second dimension, and the first dimension of the heat radiating portion is larger than the second dimension It is configured to be

Thereby, the heat dissipation area of the heat dissipation portion can be increased as compared with the case where the second dimension is larger than the first dimension.

According to the fourth aspect, the light source, the optical path housing, and the air conditioning duct are mounted on a vehicle as a movable body.

According to the fifth aspect, the light path housing and the light source are arranged in the vehicle width direction.

The end of the optical path housing located on the front side in the vehicle traveling direction is the front end, and the end of the optical path housing located on the rear side in the vehicle traveling direction is the rear end.

The end of the light source located on the front side in the vehicle traveling direction is the front end, and the end of the light source located on the rear side in the vehicle traveling direction is the rear end.

The front end of the light source is located at the same position as the front end of the light path housing in the direction of travel of the vehicle, or on the rear side of the front end of the light path housing.

The rear end of the light source is disposed at the same position as the rear end of the light path housing in the direction of travel of the vehicle, or on the front side of the rear end of the light path housing.

As a result, compared with the case where the front end of the light source is disposed on the front side with respect to the front end of the light path housing, the size in the vehicle traveling direction can be reduced in the combined size of the light path housing and the light source.

According to the sixth aspect, the outlet blows the air flow into the vehicle compartment.

According to the seventh aspect, the outlet is a side face outlet which is disposed on the right or left side in the vehicle width direction with respect to the center in the vehicle width direction in the vehicle compartment and blows the air flow to the upper body of the occupant.

According to the eighth aspect, the present invention is applied to a vehicle provided with a downstream duct for guiding an air flow blown out from an air conditioning duct to an outlet, and an air outlet of the air conditioning duct is connected to an air inlet of the downstream duct. .

According to the ninth aspect, the present invention is applied to a vehicle provided with an upstream duct for guiding the air flow from the blowout opening of the air conditioning unit to the air conditioning duct. An air inlet of the air conditioning duct is connected to an air outlet of the upstream duct.

According to the tenth aspect, the chassis, the left side portion formed extending in the vehicle width direction and located on the left side of the vehicle width direction center, and the right side portion located on the right side of the vehicle width direction center It applies to the said vehicle provided with the reinforcement which is connected and reinforces a chassis.

The light source is supported by the reinforcement.

According to an eleventh aspect, the light path housing and the air conditioning duct are configured as a single piece.

According to a twelfth aspect, a door, a determination unit, a first control unit, and a second control unit are provided.

The air conditioning duct is provided with a bypass flow passage that leads the air flow from the blowout opening to the blowout port, bypassing the heat radiating portion.

The door adjusts the ratio of the amount of air flowing from the blowout opening toward the heat dissipation portion and the amount of air flowing from the blowout opening to the bypass flow passage.

The determination unit determines whether the temperature of the air flow from the blowout opening is equal to or higher than a threshold.

When the determination unit determines that the temperature of the air flow from the blowout opening is equal to or higher than the threshold value, the first control unit causes the air flow from the blowout opening toward the heat dissipation portion to flow from the blowout opening to the bypass flow passage Control the door to increase the air flow.

When the determination unit determines that the temperature of the air flow from the blowout opening is less than the threshold value, the second control unit causes the air flow from the blowout opening to the bypass flow path to flow from the blowout opening toward the heat dissipation unit Control the door to increase the air flow.

Therefore, when the temperature of the air flow from the blowout opening is equal to or higher than the threshold value, the air flow from the blowout opening to the bypass flow passage is larger than the air flow from the blowout opening toward the heat radiating portion. For this reason, since it is possible to suppress the flow of the high temperature air flow into the heat radiating portion, it is possible to prevent the heat radiation of the light source from being obstructed by the high temperature air flow and to inhibit the light source from being disturbed beforehand.

On the other hand, when the temperature of the air flow from the blowout opening is less than the threshold value, the amount of air flowing from the blowout opening toward the heat dissipation portion is larger than the amount of air flowing from the blowout opening to the bypass flow passage. When the air flow flows to the heat radiating portion, the heat radiating portion can dissipate heat well.

Claims (12)

It is applied to a mobile body provided with a windshield (3), an air conditioning unit (40) having a blowout opening (41a) for blowing out an air flow, and a blowout opening (50) for blowing out the air flow from the blowout opening. ,
A light source (10) for emitting display light for displaying information, and an optical path housing (20) constituting an optical path (21) for propagating the display light from the light source to the windshield; The head-up display, wherein the display light passing through is irradiated to the windshield to display the information on the windshield.
The air conditioning duct (30) which forms the air flow path which leads the airflow from the said blowing opening to the said blower outlet,
The light source is exposed in the air flow path of the air conditioning duct, and the light source dissipates heat into the air flow path,
The head-up display, wherein the light path housing and the air conditioning duct are configured to separate the air flow path and the light path by means of a separation wall (32) sharing each other. The head-up display according to claim 1, wherein the light source is disposed adjacent to the light path housing. The light source includes a heat radiating portion (11) which is exposed in the air flow path and dissipates heat into the air flow path,
The direction in which the main flow of the air flow in the air flow path is the air flow direction,
The direction perpendicular to the air flow direction and one predetermined direction are taken as the orthogonal direction,
The heat radiating portion is formed in the air flow direction and the orthogonal direction,
The largest dimension in the air flow direction of the heat radiating portion is a first dimension (Ln),
The largest dimension in the orthogonal direction of the heat radiation portion is a second dimension (Lt),
The head-up display according to claim 1, wherein the heat dissipation unit is configured such that the first dimension is larger than the second dimension. The head up display according to any one of claims 1 to 3, wherein the light source, the optical path housing, and the air conditioning duct are mounted on a vehicle as the movable body. The light source and the optical path housing are arranged in the vehicle width direction.
The end of the light path housing located on the most front side in the vehicle traveling direction is a front end (20a),
The end of the light path housing located on the rearmost side in the vehicle traveling direction is a rear end (20b),
Among the light sources, the end located closest to the front in the vehicle traveling direction is referred to as a front end (10a),
The end of the light source located on the rearmost side in the vehicle traveling direction is the rear end (10b),
The front end of the light source is disposed at the same position as the front end of the light path housing in the traveling direction of the vehicle, or on the rear side of the front end of the light path housing. The head-up display according to claim 4, wherein the side end portion is disposed at the same position as the rear end portion of the light path housing in the vehicle traveling direction, or on the front side of the rear end portion of the light path housing. . The head-up display according to claim 5, wherein the air outlet blows the air flow into a vehicle cabin. 7. The head-up display according to claim 6, wherein the air outlet is a side face air outlet which is disposed on the right or left side in the vehicle width direction than the center in the vehicle width direction in the vehicle compartment and blows the air flow to the upper body of the occupant. The invention is applied to a vehicle provided with a downstream duct (34) for guiding an air flow blown out from the air conditioning duct to the air outlet;
The head up display according to any one of claims 1 to 7, wherein an air outlet of the air conditioning duct is connected to an air inlet of the downstream side duct. The invention is applied to a vehicle provided with an upstream duct (33) for guiding an air flow from the blowout opening of the air conditioning unit to the air conditioning duct,
The head-up display according to any one of claims 1 to 8, wherein an air inlet of the air conditioning duct is connected to an air outlet of the upstream duct. A chassis (5a, 5b), a left side portion formed extending in the vehicle width direction and located on the left side of the vehicle width direction center and a right side portion located on the right side of the vehicle width direction center are connected to the chassis And applied to a vehicle comprising a reinforcement (4) for reinforcing the chassis,
The head up display according to any one of claims 1 to 9, wherein the light source is supported by the reinforce. The head-up display according to any one of claims 1 to 10, wherein the light path housing and the air conditioning duct are configured as a single-piece product. A door (60), a determination unit (S100), a first control unit (S110), and a second control unit (S120);
The air conditioning duct is provided with a bypass flow passage (31a) that leads the air flow from the blowout opening to the blowout port, bypassing the heat dissipation unit,
The door adjusts a ratio of an amount of air flowing from the blowout opening toward the heat radiating portion and an amount of air flowing from the blowout opening to the bypass flow passage,
The determination unit determines whether the temperature of the air flow from the blowout opening is equal to or higher than a threshold.
When the determination unit determines that the temperature of the air flow from the blowout opening is equal to or higher than a threshold, the first control unit determines that the blowout opening has an air volume flowing from the blowout opening toward the heat dissipation unit. Control the door to increase the volume of air flowing from the
When the determination unit determines that the temperature of the air flow from the blowout opening is less than the threshold value, the second control unit determines that the air flow from the blowout opening to the bypass flow path is greater than the air flow from the blowout opening The head-up display according to any one of claims 1 to 11, wherein the door is controlled to increase an air volume flowing toward the heat radiating portion.

Images