JP2010058641A - Vehicular display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular display device capable of preventing a display window from being fogged. <P>SOLUTION: The display device 20 comprises a casing 21 for accommodating an object to be displayed, a display window 22 having a transparent member 50 provided on a front face side of the casing 21, an air outlet 60 opened inside the casing 21, and an air hose 61 forming an example of conduits connected to the air outlet 60. One end 61a of the air hose 61 is connected to the air outlet 60. An air brake device comprises an air compressor, an air drier, an air tank, and a valve mechanism to be operated when a brake pedal is stepped on. The other end 61b of the air hose 61 is connected to an air vent of the valve mechanism. When the brake pedal is released after the brake pedal is stepped on, dry compressed air exhausted from the air vent is fed inside the casing 21 via the air hose 61 and the air outlet 60. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicular display device capable of preventing fogging and water droplets from adhering to the inner surface of a display window during rainy weather traveling.

  A display device for displaying a company name, a destination, and the like on a vehicle such as a bus is provided. The conventional display device disclosed in the following Patent Document 1 houses a display board inside a transparent display window, and illuminates it with a light source from behind the display board, so that the company name, destination, etc. can be displayed even in the dark at night. It is made visible.

  Such a display device is provided, for example, between the left and right headlamps at the forefront of the vehicle body. For this reason, when the vehicle travels in stormy weather such as rainy weather, water that enters the display device may be splashed by a vehicle traveling in front of the vehicle and splashing on the display device. This water causes fogging and water droplets to adhere to the inner surface of the display window, making it difficult to see the display plate inside the display window.

  When a light source that generates a large amount of heat, such as a fluorescent lamp or an incandescent bulb, is housed inside the display device, the inner surface of the display window is relatively less cloudy due to heat generated from the light source. However, when a light source having a small calorific value, such as an LED, is used, moisture inside the display device is difficult to evaporate, and the inner surface of the display window may not be easily fogged.

In order to prevent the interior of the display device from becoming cloudy, a vehicle-mounted signage device is proposed in which warm air generated from an engine room of a vehicle is blown into a display box by a heater unit and a duct as disclosed in Patent Document 2 below. Has been.
Japanese Patent Laid-Open No. 10-20818 JP 2003-182465 A

  In order to guide the heat generated in the engine room into the display box, the in-vehicle signing device disclosed in Patent Document 2 requires a dedicated heater unit and a duct with a fan for preventing fogging. For this reason, the number of parts increases and the structure becomes complicated.

  Accordingly, an object of the present invention is to provide a vehicle display device that can effectively prevent fogging of a display window while having a simple structure.

  The present invention relates to a display device provided in a vehicle having an air brake device. The air brake device includes an air compressor that generates compressed air, an air dryer that removes moisture in the compressed air, and an air tank that stores the compressed air. A valve mechanism that operates a brake member by the compressed air supplied from the air tank when the brake pedal is depressed and releases the compressed air from an air discharge port when the brake pedal is released. Yes.

  The display device according to the present invention includes a casing that accommodates a display object, a display window that is provided on the front side of the casing and has a transparent member that allows the display object to be seen through from the outside of the casing, and air that opens into the casing. The air outlet comprises an air outlet and one end connected to the air outlet of the casing and the other end connected to the air outlet of the valve mechanism, and released after the brake pedal was depressed. Occasionally, dry compressed air discharged from the air discharge port of the valve mechanism is supplied into the casing through the air conduit and the air outlet.

  In one form of this invention, the said air brake device has a brake chamber which act | operates the said brake member with the compressed air supplied from the said air tank when the said brake pedal is stepped on, and the said brake pedal is released. Then, dry air discharged from the brake chamber is supplied into the casing through a quick release valve.

  In addition, the bottom wall of the casing is provided with an outlet provided with a flow control means that allows the air and water inside the casing to flow out and suppresses water from flowing into the casing. It is good to have.

  According to the display device of the present invention, when the brake pedal of the air brake device is stepped on and released while the vehicle is running, dry compressed air is supplied from the air discharge port of the valve mechanism to the inside of the display device. For this reason, even when the inner surface of the display window tends to be cloudy, such as when running on rainy weather, it is possible to suppress the display window from being fogged or water droplets from adhering to the inner surface of the display window.

  Since the display device of the present invention can use dry air discharged into the atmosphere when the air brake device is operated, it does not require a dedicated heater unit or duct for preventing fogging, and can save equipment and energy. Even if it exists, the display window can be effectively prevented from being fogged, and the display object inside the display window can be easily seen even in rainy weather.

A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a bus as an example of the vehicle 1. FIG. 2 is an enlarged view of the front portion of the vehicle 1. A front panel 10, a front bumper 11, headlamps 12 and 13, a display device 20, and the like are provided at the front portion of the vehicle 1. The display device 20 is used, for example, to display a company name and a destination, and is disposed in the center of the front surface of the vehicle body 2 in the width direction, for example, between the headlamps 12 and 13.

  FIG. 3 is a cross-sectional view of the display device 20 along the vertical direction. FIG. 4 is an exploded perspective view showing the display device 20. The display device 20 includes a box-shaped casing 21, a display window 22 provided on the front surface side of the casing 21, a display panel 23 disposed inside the display window 22, a garnish 24, and the like. An opening 25 for fitting the display window 22 is formed in the garnish 24 that functions as a decorative member.

  The casing 21 includes a peripheral wall 31 having a flange portion 30, a rear wall 32 that constitutes a rear surface of the casing 21, a bracket portion 33 that is attached to the vehicle body, and the like. A first packing 35 is provided between the flange portion 30 and the garnish 24. The casing 21 is fixed to the back surface of the garnish 24 by a fixing part 36 (only a part is shown in FIG. 4) such as a screw member through the first packing 35.

  A display board 23 is accommodated in the casing 21. A display surface 40 that functions as a display target is provided on the front side of the display panel 23. On the display surface 40, the destination and company name of the vehicle 1, a design for decoration, and the like are displayed. The display board 23 may represent a desired character or figure by arranging a plurality of LEDs as light emitting elements to emit light. Alternatively, the display contents may be illuminated from behind the translucent display panel by a backlight such as a fluorescent lamp. A harness 41 for supplying current to the display panel 23 is connected to an in-vehicle battery (not shown) as a power source.

  The display window 22 has a plate-like transparent member 50 made of an optically transparent material (resin or glass). An edge 51 is formed on the entire circumference of the transparent member 50. The display surface 40 of the display panel 23 faces the inner surface 22a of the display window 22 so that the display surface 40 can be viewed from the outside of the display window 22 through the transparent member 50.

  Between the display window 22 and the garnish 24, a second packing 55 and a third packing 56 are provided. The display window 22 is fitted into the opening 25 of the garnish 24 and is fixed to the garnish 24 by fixing means such as adhesion. As shown in FIG. 3, the display board 23 is accommodated in an inner space S surrounded by the casing 21, the display window 22, the garnish 24, and the like.

  An air outlet 60 is provided in the casing 21. One end 61 a of an air hose 61, which is an example of an air conduit, is connected to the air outlet 60. The air outlet 60 opens to the inside of the display device 20 and can send compressed air, which will be described later, toward the inner surface 22a of the display window 22.

  A discharge port 66 is formed in the bottom wall 65 of the casing 21. The discharge port 66 is provided with a check valve 67 which is an example of a flow control means. The check valve 67 allows the air and water inside the casing 21 to flow out to the outside of the casing 21 and suppresses water from flowing from the outside of the casing 21 toward the inside of the casing 21. It has a function to do.

  The vehicle 1 includes an air brake device 70 schematically shown in part in FIG. The air brake device 70 includes an air compressor 71 that produces compressed air, an air dryer 72 that removes moisture in the compressed air produced by the air compressor 71, an air tank 73 that stores the compressed air, and a brake chamber that is operated by the compressed air. 74, a brake member 75 driven by the brake chamber 74, a valve mechanism 76 for controlling the flow of compressed air, a brake pedal 77, and the like.

  The air compressor 71 generates compressed air in conjunction with the rotation of the engine 78 mounted on the vehicle 1. An example of the valve mechanism 76 is a quick release valve configured to quickly discharge the compressed air inside the brake chamber 74 when the brake pedal 77 is released.

  An example of the valve mechanism (quick release valve) 76 is shown in FIGS. 6 shows a state where the brake pedal 77 is depressed, and FIG. 7 shows a state where the brake pedal 77 is released. The valve mechanism 76 includes a body 81 having an air inflow chamber 80, a diaphragm-shaped valve body 82, a spring 84 that biases the valve body 82 in a direction away from the valve seat 83, an air inlet 85, and an air discharge port 86. And an air discharge port 87 and the like.

  As shown in FIG. 5, the air inlet 85 of the valve mechanism 76 is connected to the air tank 73 via a pilot valve 90 operated by a brake pedal 77. The air discharge port 86 of the valve mechanism 76 is connected to the brake chamber 74 via the control valve 91. The other end 61 b of the air hose 61 is connected to the air discharge port 87 of the valve mechanism 76.

  FIG. 6 shows the valve mechanism 76 when the brake pedal 77 is depressed by the driver. When the brake pedal 77 is depressed, the pilot valve 90 is actuated to supply the compressed air in the air tank 73 to the air inlet 85 of the valve mechanism 76. As shown in FIG. 6, the compressed air flowing into the air inflow chamber 80 from the air inlet 85 is sent from the air discharge port 86 to the brake chamber 74 via the control valve 91, whereby the brake member 75 is operated.

  FIG. 7 shows the valve mechanism 76 when the brake pedal 77 is released. When the brake pedal 77 is released, the valve element 82 moves away from the valve seat 83 by the elasticity of the spring 84. As a result, the compressed air discharged from the brake chamber 74 is sent to the display device 20 via the air hose 61 via the air discharge port 86 and the air discharge port 87.

The operation of the display device 20 will be described below.
A display target such as a destination or a company name displayed on the display panel 23 of the display device 20 can be viewed from the outside of the transparent display window 22 under bright conditions such as daytime. In the dark such as at night, the display surface 40 can be visually recognized by turning on the light source built in the display panel 23 and illuminating the display surface 40 from the inside. In the case of the display board 23 provided with light emitting elements, such as LED, it can display regardless of daytime or nighttime by making a light emitting element light-emit.

  When the brake pedal 77 is depressed, compressed air is sent to the brake chamber 74, whereby the brake member 75 is activated. When the brake pedal 77 is released, compressed air discharged from the brake chamber 74 is sent to the display device 20 via the air hose 61. The compressed air sent to the display device 20 flows into the display device 20 from the air outlet 60 and is ejected toward the back surface (inner surface 22a) of the display window 22.

  Thus, whenever the driver operates the brake pedal 77, the compressed air discharged from the valve mechanism 76 is supplied to the inner surface 22a of the display window 22. The compressed air is dried because the moisture is removed by the air dryer 72. For this reason, since the humidity in the display device 20 is lowered and water droplets can be blown off by the compressed air ejected from the air outlet 60, it is possible to prevent the inner surface 22a of the display window 22 from becoming cloudy or adhering to the water droplets. can do.

  Air that flows into the display device 20 from the air outlet 60 is discharged from the outlet 66. Since the discharge port 66 is provided with a check valve 67 that functions as a flow control means, rainwater or the like is prevented from entering the inside of the casing 21 from the outside of the casing 21 during traveling in rainy weather. Is done. Even if water enters the inside of the display device 20, this water is discharged to the outside from the discharge port 66 together with the compressed air flowing into the display device 20 from the air outlet 60.

  As described above, in the present embodiment, in order to supply dry compressed air discharged from the air brake device 70 to the inside of the display device 20, a light source that generates a small amount of heat, such as an LED, is used for the display device 20. Even in this case, it is possible to prevent the inner surface 22a of the display window 22 from being fogged or having water droplets attached thereto.

  In the present embodiment, the air hose 61 only needs to be connected to the air discharge port 87 of the existing air brake device 70 provided in the vehicle 1, so that a dedicated heater or blower for preventing fogging is not required, and the structure is Simple. In addition, since the compressed air discharged from the air brake device 70 can be used, special energy for preventing fogging is not required, resulting in saving equipment and energy.

  Further, the display device 20 according to the present embodiment can attenuate the exhaust sound of the compressed air by discharging the compressed air discharged from the air brake device 70 into the display device 20. Moreover, since the display device 20 is disposed on the front surface of the vehicle body 2 and is relatively distant from the driver's seat and passenger seat, it is possible to reduce the exhaust sound reaching the passenger compartment.

  In a general air brake device, a silencer (silencer) is used at the air discharge port 87 in order to reduce the exhaust sound of the compressed air discharged from the valve mechanism 76. However, according to the display device 20 of the present embodiment, it is possible to omit the silencer by connecting the air hose 61 instead of the silencer.

  As described above, in this embodiment, the compressed air discharged from the air discharge port 87 of the valve mechanism (quick release valve) 76 is supplied to the display device 20. As another example, the compressed air discharged from the pilot valve 90 may be supplied to the display device 20 by connecting the air hose 61 to the air discharge port of the pilot valve 90 associated with the brake pedal 77. In short, the compressed air discharged when the air brake device 70 is operated may be guided to the display device 20 through the air conduit.

  FIG. 8 shows a display device 20 'according to the second embodiment of the present invention. The display device 20 ′ is provided with a display body 100 as a display target by painting or printing, pasting a display film on the inner surface 22 a of the display window 22. The casing 21 accommodates a light source (backlight) 101 such as a fluorescent lamp. By illuminating the display body 100 from behind with the light source 101, the display body 100 can be visually recognized even at night. Other configurations and operational effects are the same as those of the display device 20 of the first embodiment.

  Also in the display device 20 ′ of the second embodiment, when the brake pedal 77 is released after being depressed, the dry compressed air discharged from the air discharge port 87 of the valve mechanism 76 is discharged from the air discharge port 60. By being supplied to the inside of the display device 20 ′, it is possible to prevent the display body 100 provided on the inner surface 22 a of the display window 22 from being clouded or having water droplets attached thereto.

  Needless to say, in carrying out the present invention, the structure and arrangement of the components of the invention including the casing, the display window, the display object, the air outlet, and the air conduit can be changed as appropriate. For example, the air conduit may be configured by connecting piping members such as an air hose and a metal pipe.

1 is a perspective view of a vehicle provided with a display device according to a first embodiment of the present invention. The perspective view which expands and shows the display apparatus vicinity of the vehicle shown by FIG. FIG. 3 is a cross-sectional view of the display device shown in FIG. 2. FIG. 3 is an exploded perspective view of the display device shown in FIG. 2. Schematic which shows typically a part of air brake device of the vehicle shown by FIG. Sectional drawing of a valve mechanism when a brake pedal is depressed. Sectional drawing of the said valve mechanism when a brake pedal is released. Sectional drawing of the display apparatus which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

20, 20 '... display device 21 ... casing 22 ... display window 50 ... transparent member 60 ... air outlet 61 ... air hose (air conduit)
66 ... Discharge port 70 ... Air brake device 76 ... Valve mechanism 86 ... Air discharge port

Claims (3)

A display device provided in a vehicle having an air brake device,
The air brake device is
An air compressor that creates compressed air;
An air dryer for removing moisture in the compressed air;
An air tank for storing the compressed air;
A brake mechanism that operates the brake member by the compressed air supplied from the air tank when the brake pedal is depressed, and releases the compressed air from an air discharge port when the brake pedal is released;
The display device
A casing for accommodating a display object;
A display window having a transparent member provided on the front side of the casing and capable of seeing through a display object from the outside of the casing;
An air outlet opening in the casing;
An air conduit having one end connected to the air outlet of the casing and the other end connected to the air outlet of the valve mechanism;
Supplying dry compressed air discharged from the air discharge port of the valve mechanism to the inside of the casing through the air conduit and the air outlet when the brake pedal is released after being depressed. A display device for vehicles.   The air brake device has a brake chamber that operates the brake member by compressed air supplied from the air tank when the brake pedal is depressed, and is discharged from the brake chamber when the brake pedal is released. The vehicular display device according to claim 1, wherein the dried air is supplied into the casing through the valve mechanism.   The bottom wall of the casing is provided with a discharge port provided with a flow control means that allows the air and water inside the casing to flow out and suppresses the inflow of water from the outside of the casing. The vehicle display device according to claim 1, wherein the display device is a vehicle display device.

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