JP6300012B2 - Head-up display device, cooling system for head-up display device - Google Patents

Description

  The present invention relates to a head-up display device that displays a virtual image and a cooling system that cools the head-up display device.

  A head-up display device (hereinafter referred to as a HUD device) includes a display device including a light source and a display element (liquid crystal display panel or the like), a reflective mirror such as a concave mirror, and a housing that houses the display device and the reflective mirror. Consists mainly of. The display light from the display is reflected by a reflecting mirror such as a concave mirror, and enters a reflecting means such as a windshield through a translucent cover installed in the opening. Then, the incident light is reflected by a transmission reflection surface such as a windshield, so that video information is presented as a virtual image formed in front of the windshield or the like.

  In the HUD device, it is necessary to increase the light intensity of the display light projected onto the windshield so that a virtual image can be visually recognized even in the daytime. Therefore, the power consumption of the light source increases and the light source itself generates heat due to the heat generated by the drive current. There was a problem of high temperatures.

  In the HUD device disclosed in Patent Document 1, a light source is thermally connected to one end of a heat sink made of a metal material, heat generated from the light source is absorbed by the heat sink, and the absorbed heat is exposed from the housing of the HUD device. By discharging from the other end of the heat sink, overheating of the light source is prevented. Japanese Patent Application Laid-Open No. H10-228561 describes that the heat sink is radiated more quickly by cooling fins formed at the other end exposed from the housing of the heat sink by blowing air from an air cooling fan.

JP 2009-288484 A

  However, in the cooling system of the HUD device that enhances the heat dissipation of the heat sink by blowing the fan disclosed in Patent Document 1, warm air that is not temperature-controlled is blown to the heat sink, which causes a problem with the cooling efficiency of the heat sink. was there. Furthermore, since the air cooling fan is continuously rotated during cooling, there is a risk of increasing power consumption.

  The present invention has been made in view of this problem, and provides a head-up display device capable of efficiently cooling a heating portion while suppressing power consumption, and a cooling system for the head-up display device.

A cooling system for a head-up display device according to the present invention includes an air-conditioning device mounted on a vehicle, a head-up display device that has a heat radiating member that radiates heat from a heat generation point, and displays an image to an occupant of the vehicle. In the cooling system of the head-up display device that cools the heat radiating member with the air of the air conditioner, a first air passage that sends the air blown by the air conditioner into the vehicle interior, and the first air passage A second air passage branched from the second air passage, a damper that adjusts the amount of air passing through the second air passage, a damper motor that swings the damper, and a control unit that controls the damper motor, and the heat dissipation member includes: the entire circumference of the inner wall of the second air passage is formed, the coupled in the middle of the second air passage, the direction substantially parallel to the extending of the wind flowing in the second air passage to the inside of the inner wall The fins is intended to protrude.

  A head-up display device according to the present invention is a head-up display device used in the cooling system for the head-up display device.

  It is possible to provide a head-up display device capable of efficiently cooling a heated portion while suppressing power consumption, and a cooling system for the head-up display device.

It is a schematic sectional drawing which shows embodiment of this invention. It is sectional drawing for demonstrating the mechanism of the cooling system of embodiment same as the above, (a) shows the closed state of a damper, (b) is a figure which shows the open state of a damper. It is sectional drawing which shows the heat radiating member arrange | positioned in the 2nd ventilation path of embodiment same as the above. It is a block diagram which shows embodiment same as the above. It is sectional drawing which shows the modification of a heat radiating member.

  The HUD device 1 is mounted on, for example, an automobile. As shown in FIG. 1 and the like, the housing 10, the display device 20, the heat radiating member 30, the plane mirror 40, the concave mirror 50, the actuator 60, HUD control circuit 100.

  The HUD device 1 reflects the display light L representing the display image M displayed by the display device 20 with the plane mirror 40 and the concave mirror 50, and irradiates the windshield 2 of the vehicle on which the HUD device 1 is mounted for display. The contents displayed by the HUD device 1 in this way are various vehicle information, navigation information, and the like.

  The housing 10 is composed of, for example, an upper case 11 formed of a synthetic resin in black and a lower case 12. By engaging the upper case 11 and the lower case 12, the plane mirror 40, the concave mirror 50, and the actuator 60 are formed. The HUD control circuit 100 is housed inside, and the display device 20 is attached outside.

  The upper case 11 has an opening 11a through which the display light L to be described later passes through the windshield 2 at a portion facing the windshield 2, and the opening 11a is covered with a translucent cover 11b. Further, the upper case 11 has a light shielding wall 11c at a location near the plane mirror 40 of the opening 11a, and external light incident from the opening 11a (translucent cover 11b) is directed to the plane mirror 40 side or the display 20 side. Prevent progress.

  The lower case 12 has a plane mirror 40, a concave mirror 50, an actuator 60, a HUD control circuit 100, and an engaging portion (not shown) for engaging the display 20 attached to the outside, which are housed inside the housing 10. The display 20, the plane mirror 40, the concave mirror 50, the actuator 60, the HUD control circuit 100, etc. are positioned and fixed. The lower case 12 is inserted through a display port 12a opened so that the display image M displayed on the display device 20 faces the flat mirror 40 and a wiring member (not shown) connected from the HUD control circuit 100 to the display device 20 respectively. Wiring holes (not shown). Although not shown in the figure, the lower case 12 has wiring for supplying various signals such as image information and power from the vehicle side to the HUD control circuit 100 described later, and the temperature of the display 20 in the vehicle-side control unit 200 described later. It also has a wiring hole through which a wiring for transmitting information is inserted.

  The display 20 emits display light L representing a display image M for notifying predetermined information (various vehicle information, navigation information, etc.). For example, a liquid crystal panel (not shown) and a light source for backlight It is comprised from the transmissive liquid crystal display comprised from (not shown). The backlight light source is connected so as to be able to transmit heat generated in the heat radiating member 30 described later. The indicator 20 and the heat dissipation member 30 are each attached to the engaging portion of the lower case 12. The display 20 is connected to a wiring member from the HUD control circuit 100. The backlight light source emits desired light in response to an electric signal and power supply from the wiring member. A desired display image M is displayed on the display surface in accordance with the electrical signal and power supply from the member.

  The display 20 is provided with a display temperature sensor 21 at a position where the temperature of the backlight light source can be detected directly or indirectly, and temperature information of the display 20 detected by the display temperature sensor 21 will be described later. Transmit to the HUD control circuit 100. The HUD control circuit 100 to be described later executes “cooling processing” or “display restriction processing” to be described later based on the temperature information input from the indicator temperature sensor 21. These processes will be described in detail later.

  The plane mirror 40 reflects the display light L emitted from the display device 20 toward the concave mirror 50.

  The concave mirror 50 is formed by forming a reflective film on the surface of a base material made of, for example, a synthetic resin material by means such as vapor deposition. The concave mirror 50 further reflects the display light L reflected by the plane mirror 40 and emits it toward the windshield 2. To do. The display light L reflected by the concave mirror 50 passes through the translucent cover 11 b provided in the opening 11 a of the housing 10 and travels toward the windshield 2. The reflected display light L that reaches the windshield 2 forms a virtual image (display image visually recognized by the observer E) V of the display image M at a position in front of the windshield 2. As a result, the HUD device 1 allows the observer E (mainly the driver of the vehicle) to visually recognize both the virtual image V and the outside scene actually present in front of the windshield 2.

  The actuator 60 includes a motor (not shown), a power transmission member (not shown) such as a gear that transmits the power of the motor to the concave mirror 50, and a support base (not shown) that supports the motor, the power transmission member, and the concave mirror 50. And the concave mirror 50 is rotated around the rotation axis AX. The motor generates power for rotating the concave mirror 50 around the rotation axis AX, and includes, for example, a stepping motor. The motor is connected to a wiring member from the HUD control circuit 100, which will be described later, and rotates the motor in response to an electric signal and power supply from the wiring member, and the power transmission member transmits power to the concave mirror 50. Is rotated around the rotation axis AX.

  The above is the configuration of the HUD device 1 in the present embodiment. The cooling system of the HUD device 1 will be described with reference to FIGS. FIG. 2 is a cross-sectional view for explaining a state in which the heat radiating member 30 of the HUD device 1 is cooled by air of an air conditioner 300 to be described later, and FIG. 2A is a case where the heat radiating member 30 is not cooled. FIG. 2B shows a state in which the heat radiating member 30 is cooled. FIG. 3 is a cross-sectional view of a second ventilation path 420 to be described later.

  As shown in FIG. 2, the cooling system of the present embodiment includes a first ventilation path 400 formed by a first duct 400 a that sends air temperature-adjusted by an air conditioner 300 mounted on a vehicle to a blowout port in the vehicle. A second ventilation path 420 formed by the branched second duct 420a is provided. The second ventilation path 420 has an inflow port 421 through which air flows from the first ventilation path 400, and an outflow port 422 that returns the air flowing in from the inflow port 421 to the first ventilation path 400. The fin 30 a of the HUD device 1 is disposed in the second ventilation path 420 between the HUD device 1 and the outlet 422. 3A, the fins 30a are arranged so as to extend substantially in parallel with the wind traveling direction in the second ventilation path 420. As shown in FIG.

  The inflow port 421 is provided with a damper 500 capable of adjusting the air volume branched from the first ventilation path 400 to the second ventilation path 420 based on the control of the control unit 200 described later. The damper 500 has a damper motor 510, and the damper motor 510 swings the damper 500 based on the control of the control unit 200. The damper 500 blocks the wind flowing from the first ventilation path 400 to the second ventilation path 420 by being in the closed state shown in FIG. In this case, all the wind sent from the air conditioner 300 goes to the outlet without passing through the second ventilation path 420. And the damper 500 flows in the wind from the 1st ventilation path 400 to the 2nd ventilation path 420 by becoming an open state shown in FIG.2 (b). In this case, the fin 30a of the HUD device 1 can be cooled by passing a part of the wind sent out from the air conditioner 300 through the second ventilation path 420, and the wind that has passed through the first ventilation path 400 as it is. The wind that has passed through the fins 30a that has flowed out of the outlet 422 is combined with the wind toward the outlet.

  The above is the configuration of the cooling system of the present embodiment, and the control of the cooling system will be described with reference to FIG. FIG. 4 is a block diagram showing an electrical configuration of the cooling system of the present embodiment.

  The cooling system of the present embodiment includes an air conditioner 300 and a control unit 200 that controls a damper 500 (damper motor 510) that adjusts an air volume for cooling the fins 30a of the HUD device 1. The control unit 200 inputs temperature information of the display device 20 from the display device temperature sensor 21 via the HUD control circuit 100 of the HUD device 1, and controls the damper motor 510 based on the input temperature information. Further, the control unit 200 can control the air conditioner 300 by the occupant controlling an operation unit (not shown). Specifically, for example, the air conditioner 300 includes a blower motor (not shown) that adjusts the air volume, and an AC compressor (not shown) that adjusts the temperature of the air, and the occupant operates the operation unit so that the air volume or Adjust the wind temperature.

When the temperature information from the display device temperature sensor 21 is higher than the predetermined first threshold temperature, the control unit 200 opens the damper 500 and starts blowing air to the second ventilation path 420 to start the HUD device. One fin 30a is cooled (cooling process). Specifically, for example, when the temperature of the display 20 becomes 50 ° C. (first threshold temperature) or higher, the control unit 200 controls the damper 500 and starts cooling the display 20 (fin 30a). In addition, the control unit 200 may control the damper 500 so that the air volume to the 2nd ventilation path 420 increases so that the temperature of the indicator 20 is high.
Further, when the temperature information from the display device temperature sensor 21 is lower than the predetermined second threshold temperature, the control unit 200 closes the damper 500 and blocks the wind to the second ventilation path 420. The fin 30a of the HUD device 1 is not cooled.

  Further, the control unit 200 monitors the temperature information input from the display device temperature sensor 21 even after the cooling process is performed, and controls the damper 500 when the temperature of the display device 20 does not tend to decrease even after a predetermined time. Thus, the air volume to the second ventilation path 420 is increased. When the air volume to the second ventilation path 420 is the maximum, the control unit 200 controls the blower motor of the air conditioner 300 to increase the air volume from the air conditioner 300, and / or the AC of the air conditioner 300. A compressor is controlled and the temperature of the wind from the air conditioner 300 is reduced. With such a configuration, the display device 20 can be reliably cooled.

  Further, the cooling system of the present embodiment is provided with a ventilation path temperature sensor 600 that can detect the temperature of the wind in the first ventilation path 400, and the control unit 200 inputs temperature information from the ventilation path temperature sensor 600. When the temperature of the display 20 is higher than the first threshold temperature and the temperature information from the ventilation path temperature sensor 600 is higher than a predetermined first specified temperature (for example, 70 ° C.), the control unit 200 performs the cooling process. The output of the light source of the display device 20 is reduced via the HUD control circuit 100 (display restriction process). When the temperature information from the ventilation path temperature sensor 600 is lower than a predetermined second specified temperature, the control unit 200 executes a cooling process for controlling the damper 500 to cool the fins 30a (display device 20). When the temperature information from the display device temperature sensor 21 becomes lower than a predetermined temperature, the output of the light source of the display device 20 is returned to normal and the display restriction process is terminated.

  Moreover, when the temperature information from the ventilation path temperature sensor 600 is too low, it is conceivable that the light source of the display device 20 is cooled too much through the fins 30a and condensation occurs. In such a case, when the temperature from the ventilation path temperature sensor 600 is lower than the predetermined third specified temperature, the control unit 200 displays the damper 500 by closing it or opening it slightly. The rapid temperature drop of the light source of the vessel 20 can be suppressed.

  As described above, the cooling system for the HUD device 1 according to the present embodiment includes the air conditioner 300 mounted on the vehicle and the heat dissipating member 30 that dissipates the heat of the display device 20. 1 is a cooling system of the HUD device 1 that cools the heat radiating member 30 with the wind of the air conditioner 300, and a first ventilation path 400 that sends the air blown by the air conditioner 300 to the vehicle interior. The second ventilation path 420 branched from the first ventilation path 400, the damper 500 for adjusting the air volume passing through the second ventilation path 420, the damper motor 510 for swinging the damper 500, and the control unit 200 for controlling the damper motor 510 The heat dissipating member 30 is disposed in the second ventilation path 420. With such a configuration, the air conditioner 300 is simply controlled by the damper 500. The temperature conditioned air al, it is possible to cool the heat radiating member 30 of the HUD device 1, while suppressing the power consumption, efficient heat dissipation member 30 can be cooled.

  In addition, the cooling system of the HUD device 1 in the present embodiment further includes a display temperature sensor 21 that detects the temperature of the light source of the display 20 that is a heat generation location of the HUD device 1, and the control unit 200 includes the display temperature sensor 21. Based on the temperature information, the damper motor 510 is controlled to adjust the amount of air passing through the second ventilation path 420. With this configuration, only when the display 20 needs to be cooled according to the temperature of the display 20. Since the wind can be caused to flow from the first ventilation path 400 to the second ventilation path 420, the heat radiation member 30 can be reliably cooled while suppressing the function of the air conditioner 300 as the air conditioning.

  In addition, this invention is not limited by the said embodiment and drawing. Of course, changes (including deletion of components) can be added to these.

  Moreover, the heat radiating member 30 arrange | positioned in the 2nd ventilation path 420 can be changed suitably, for example, as shown in FIG. 5, instead of the 2nd duct 420a which forms the 2nd ventilation path 420, the heat radiating member 30 of FIG. A part of the heat radiating duct 30b may be formed, and the heat radiating duct 30b may be interposed in the middle of the second duct 420a. With such a configuration, the heat radiating member 30 can be efficiently cooled by the wind from the air conditioner 300.

  In the above description, the damper 500 is disposed at the inflow port 421 of the second ventilation path 420, but is not limited thereto, and may be disposed at the outflow port 422, for example. In this case, when the damper 500 is closed at the outlet 422, the wind flow in the second ventilation path 420 remains, and as a result, the cooling of the heat radiating member 30 can be stopped or moderated.

  Further, in the above description, the heat radiating member 30 radiates the heat of the light source of the display 20, but is not limited thereto, and radiates the heat of the transmissive liquid crystal display of the display 20. Also good. In the above embodiment, a transmissive liquid crystal display is used as the display 20. However, as the display 20 used in the HUD device 1, a self-luminous organic EL panel or a light beam is scanned by a mirror. A scanning display that generates an image may be used, or a reflective display such as LCOS (registered trademark: Liquid crystal on silicon) or DMD (registered trademark: Digital Micromirror Device) may be applied. The heat dissipating member 30 may be configured to cool the heat generation points of these various indicators 20.

1 HUD device (head-up display device)
2 windshield 10 housing 11 upper case 11a opening 11b translucent cover 11c light shielding wall 12 lower case 12a display port 20 display 21 display temperature sensor (first temperature sensor)
30 Heat Dissipation Member 30a Fin 40 Plane Mirror 50 Concave Mirror 60 Actuator 100 HUD Control Circuit 200 Control Unit (Control Unit)
DESCRIPTION OF SYMBOLS 300 Air conditioning apparatus 400 1st ventilation path 400a 1st duct 410 Outlet 420 2nd ventilation path 420a 2nd duct 421 Inlet 422 Outlet 500 Damper 510 Damper motor 600 Ventilation path temperature sensor (2nd temperature sensor)

Claims (5)

An air conditioner mounted on the vehicle, and a head-up display device that includes a heat dissipating member that dissipates heat from the heat generation part and displays an image to the vehicle occupant. In the cooling system of the head-up display device that is cooled by wind,
A first ventilation path for sending the air blown by the air conditioner into the interior of the vehicle;
A second ventilation path branched from the first ventilation path;
A damper for adjusting the amount of air passing through the second ventilation path;
A damper motor for swinging the damper;
A control unit for controlling the damper motor,
The heat radiating member forms an inner wall of the entire circumference of the second ventilation path, is connected to the middle of the second ventilation path, and extends substantially parallel to the direction of the air flowing through the second ventilation path inside the inner wall. Projecting the existing fins ,
A cooling system for a head-up display device. A first temperature sensor for detecting a temperature of the heat generation portion of the head-up display device,
The control unit controls the damper motor based on temperature information from the first temperature sensor and adjusts the amount of air passing through the second ventilation path,
The cooling system of the head-up display device according to claim 1.
Rejection system. The heat radiating member is formed by forming a part of the inner wall of the second ventilation path.
The cooling system of the head-up display device according to claim 1 or 2, characterized in that. The damper motor swings the damper so that the amount of air passing through the second ventilation path can be adjusted stepwise.
The head-up display device cooling system according to any one of claims 1 to 3 . A head-up display device used in the cooling system for the head-up display device according to claim 1.

Images