JP2007069771A - Head-up display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent display from deteriorating due to dew condensation in a head-up display device with a device body integrated with an air-conditioning duct. <P>SOLUTION: This head-up display device 1 for a vehicle is provided with a device body 2 integrated with air-conditioning ducts 61-63, and the device body 2 comprises a dust cover 24 having translucency, an indicator 21 emitting indication lights indicating information, and reflection mirrors 22, 23 reflecting the indication lights from the indicator 21 toward a windshield 5 through the dust cover 24. A anti-fogging film 25 having translucency and water absorption property is formed on at least one of an inner face 24b of the dust cover 24 and reflection faces 22a, 23a of the reflection mirrors 22, 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle head-up display device including a device main body unit integrated with an air conditioning duct.

  A vehicle head-up display device (HUD) includes a device main body including a dust cover, a display, and a reflecting mirror, and a half mirror formed on the inner surface of the windshield. The dust cover is translucent and is provided in the opening of the instrument panel. The display and the reflector are disposed behind the dust cover.

  The display emits display light that represents information, and the reflector reflects the display light from the display through a dust cover toward the half mirror (wind shield). The half mirror reflects The reflected light from the mirror is reflected toward the viewer side. The HUD causes the viewer to recognize the information on the display device as a virtual image when the half mirror reflects the reflected light from the reflecting mirror toward the viewer.

Here, in order to improve the vehicle mountability of the HUD, a device in which the HUD device main body is integrated with an air conditioning duct in the passenger compartment has been proposed (see Patent Documents 1 and 2). In this configuration, the apparatus main body is connected to an air conditioning duct for air conditioning the vehicle interior, and the interior of the apparatus main body is configured as a part of the air conditioning air passage.
JP-A-61-75025 JP 2003-118426 A

  However, when the HUD device main body is integrated with the air conditioning duct, the air conditioning air flowing through the air conditioning duct flows inside the device main body, so the inner surface of the dustproof cover and the reflective surface of the reflector are Exposed to air. For example, the dust cover and the reflector are cold if cold air-conditioned air (cold air) flows inside the apparatus main body, and warm if warm air-conditioned air (hot air) flows inside the apparatus main body. It has become.

  For this reason, if the warm air suddenly flows inside the main unit while the dust cover and the reflector are cold, the moisture (water vapor) in the warm air is reflected from the inner surface of the dust cover and the reflector. Contact with the surfaces causes condensation (cloudiness) on these surfaces, resulting in a wet state with moisture. Further, since dust adheres to the surface wetted with moisture due to condensation, there is a problem that the display of HUD is lowered or cannot be recognized due to condensation and the adhered dust.

  Further, even if the condensed water droplets evaporate and the inner surface of the dustproof cover and the reflecting surface of the reflecting mirror are dried, dust attached to these surfaces remains. For this reason, the problem that the display of HUD is reduced or unrecognizable when condensation occurs and becomes wet with water continues to occur even after they are dried.

  The present invention has been made in view of the above points, and in a vehicle head-up display device including an apparatus main body unit integrated with an air conditioning duct, the display thereof is prevented from deteriorating due to the occurrence of condensation. Objective.

  In order to achieve the above object, the present invention employs the following technical means.

  The vehicle head-up display device according to claim 1 is provided with a vehicle head including an apparatus main body part that forms a part of an air-conditioning air passage by being connected to an air-conditioning duct for air-conditioning a vehicle interior. An up-display device in which a device main body portion is provided with a light-transmitting dust-proof cover, a display device that is disposed behind the dust-proof cover and emits display light representing information, and is disposed and displayed behind the dust-proof cover. A reflecting mirror that reflects the display light from the container toward the windshield through the dust cover, and a defogging film having translucency and water absorption is provided on at least one of the inner surface of the dust cover and the reflecting surface of the reflecting mirror. The structure is formed.

  In this configuration, in the apparatus main body unit integrated with the air conditioning duct, an antifogging film having translucency and water absorption is formed on at least one of the inner surface of the dustproof cover and the reflecting surface of the reflecting mirror. As a result, even if warm air-conditioned air (warm air) is blown onto the inner surface of the cold dustproof cover or the reflecting surface of the reflector, the anti-fogging film will cause condensation ( Before the cloudiness occurs, the moisture in the warm air is absorbed inside.

  For this reason, on the upper surface of the anti-fogging film, it is possible to prevent the occurrence of condensation, maintain the drying at all times, and prevent dust from adhering to the anti-fogging film. As a result, in the vehicle head-up display device including the device main body unit integrated with the air conditioning duct, the display can be prevented from being reduced due to the occurrence of condensation.

  Moreover, since this anti-fogging film has translucency, it does not interfere with the display function of the vehicle head-up display device.

  The vehicle head-up display device according to claim 2 is configured such that the antifogging film is formed of a polyurethane resin.

  In this configuration, the antifogging film is formed from a polyurethane-based resin, whereby the above-described effects can be obtained.

  The head-up display device for a vehicle according to claim 3, wherein the dustproof cover on which the antifogging film is formed includes a hard coat film for preventing scratches on a surface opposite to the inner surface, and the hard coat film is antifogged. It is set as the structure comprised so that it may form simultaneously with a film | membrane.

  In this configuration, since the hard coat film is formed simultaneously with the anti-fogging film, the above-described effects can be obtained at low cost.

  The vehicle head-up display device according to claim 4 is configured such that the reflecting mirror on which the antifogging film is formed is at least one of a plane mirror and a concave mirror.

  Even with this configuration, the above-described effects can be obtained.

  The vehicle head-up display device according to claim 5 is configured such that the dust-proof cover on which the anti-fogging film is formed is formed from a polycarbonate resin or an acrylic resin.

  Even with this configuration, the above-described effects can be obtained.

  A vehicle head-up display device according to the present invention will be described below with reference to the drawings.

(Constitution)
FIG. 1 is a schematic diagram showing an overall configuration of a vehicle head-up display device 1 according to an embodiment of the present invention.

  2A is a schematic perspective view showing the configuration of the apparatus main body 2 shown in FIG. 1, and FIG. 2B is a sectional view taken along line IIB-IIB in FIG.

  FIG. 3 is a schematic perspective view showing a state where the apparatus main body 2 shown in FIG. 1 is integrated with the air conditioning duct 61-63.

  FIG. 4 is a circuit configuration diagram illustrating an electrical circuit configuration of the vehicle head-up display device 1 (device main body 2) according to an embodiment of the present invention.

  As shown in FIG. 1, the vehicle head-up display device (HUD) 1 includes a dust-proof cover 24, a liquid crystal display 21 that is a display, a plane mirror 22 that is a reflecting mirror, and a concave mirror 23. And a half mirror 3 formed on the inner surface of the windshield 5 (the surface on the vehicle interior side, the surface on the right side indicated by the arrow in the figure). The dustproof cover 24 has translucency and is provided in the opening of the instrument panel 4. The liquid crystal display 21, the flat mirror 22, and the concave mirror 23 are disposed behind the dustproof cover 24 (downward as indicated by arrows in the drawing).

  The liquid crystal display 21 emits display light representing, for example, travel speed information. The flat mirror 22 and the concave mirror 23 pass the display light from the liquid crystal display 21 through the dustproof cover 24 and the half mirror 3 (wind shield 5). The half mirror 3 reflects the reflected light from the concave mirror 23 toward the viewer M.

  The HUD 1 causes the viewer M to recognize the real image 21A of the information represented by the display light emitted from the liquid crystal display 21 as the virtual image 21B when the half mirror 3 reflects the reflected light from the concave mirror 23 to the viewer M. It is.

  In the apparatus main body 2, the liquid crystal display 21, the flat mirror 22, the concave mirror 23, and the dustproof cover 24 are arranged as shown in FIG. That is, the plane mirror 22 is arranged at a position where the display light emitted from the liquid crystal display 21 can be reflected to the concave mirror 23, and the concave mirror 23 is arranged at a position where the reflected light from the plane mirror 22 can be reflected to the dustproof cover 24. . The dust cover 24 is arranged at a position where the reflected light from the concave mirror 23 can be reflected to the half mirror 3.

  The concave mirror 23 enlarges and displays the virtual image 21B with respect to the real image 21A (for example, about 5 times), and the half mirror 3 (wind shield 5) itself has this enlargement function (for example, about 1.2 times). is doing.

  The liquid crystal display 21, the flat mirror 22, and the concave mirror 23 are disposed in the casing portion 26 of the apparatus main body 2, and the dust cover 24 is provided in the opening of the upper surface (instrument panel 4) of the casing portion 26. The dust cover 24 is translucent, and has a function of transmitting reflected light from the concave mirror 23 to the half mirror 3 and a function of preventing dust from entering the casing portion 26.

  In addition, in order to make FIG. 1 and FIG. 2 (a) easy to understand, the casing part 26 is illustrated with the imaginary line (two-dot chain line).

  As shown in FIG. 2B, the dust-proof cover 24 has a base portion 24a formed from a polycarbonate resin having translucency, and a scratch prevention formed on the upper surface (the upper surface indicated by the arrow in the figure). The hard coat film 24c is used. The hard coat film 24c is formed from a translucent acrylic resin.

  An antifogging film 25 that is a feature of the present invention is formed on the inner surface 24b of the dustproof cover 24 (the surface on the inner side of the casing portion 26). The anti-fogging film 25 is a polyurethane resin having translucency and water absorption (for example, Lexan CTG HP92AF manufactured by General Electric Co. (GE), which absorbs water molecules therein through chemical bonds). It is formed from.

  The base portion 24a is formed into a plate shape having a plate thickness of 1 millimeter (mm) by extruding and molding a polycarbonate resin.

  The hard coat film 24c and the antifogging film 25 are coated in the sheet processing step. Specifically, the hard coat film 24c and the anti-fogging film 25 are simultaneously formed on the upper surface and the lower surface of the base portion 24a using the rollers while the base portion 24a is sandwiched between upper and lower rollers and conveyed from one to the other. The hard coat film 24c and the antifogging film 25 are formed by forming each film pressure to 2 to 3 micrometers (μm) and curing by ultraviolet irradiation or heating.

  This is because the antifogging film 25 is formed on the inner surface 24b of the dustproof cover 24 and the hard coat film 24c is formed on the upper surface opposite to the inner surface 24b. Are formed at the same time.

  An antifogging film 25 having the same translucency and water absorption is also formed on the reflecting surface 22a of the flat mirror 22 and the reflecting surface 23a of the concave mirror 23 by a post-treatment such as coating.

  As shown in FIG. 3, the apparatus main body 2 (that is, the casing 26) is integrated with an air conditioning duct 61-63 in the vehicle interior in order to improve the vehicle mountability of the HUD 1. That is, the apparatus main body 2 is connected to the air conditioning duct 61-63, and the inside of the apparatus main body 2 is configured as a part CA1 and CA2 of the air conditioning air passage.

  Specifically, the air conditioning duct 62 is connected to one surface of the casing portion 26, and the air conditioning duct 63 connected to a side defroster outlet (not shown) is connected to the other surface of the casing portion 26. Thereby, the inside of the apparatus main body 2 constitutes an air conditioning air passage indicated by an arrow CA1.

  Further, the air conditioning duct 61 is connected to the casing portion 26, and a main defroster outlet 64 attached to the HUD 1 is formed on the upper surface of the upper surface (instrument panel 4) of the casing portion 26. Thereby, the inside of the apparatus main body 2 constitutes an air conditioning air duct indicated by an arrow CA2.

  A main defroster outlet (not shown) attached to an air conditioner unit (not shown) is provided separately from the main defroster outlet 64.

  2 and 3 are the same as the up and down directions indicated by the arrows in FIG.

  The electric circuit configuration of the HUD 1 according to the present embodiment described above will be described with reference to FIG.

Electric power is constantly supplied from the battery 9 to the control device 27 composed of a microcomputer or the like. The ignition switch 8 is connected so as to be able to detect its operating state (ON or OFF), and a speed sensor 7 for detecting the traveling speed of the automobile is connected so that a detection signal can be inputted. In addition, the liquid crystal display 21 is also connected to the control device 27.
(Operation)
The operation of this embodiment in the above configuration will be described.

  When the ignition switch 8 is turned on by the driver, the control device 27 detects it and starts operation. That is, in FIG. 4, the vehicle speed of the vehicle is calculated based on the output signal from the speed sensor 7, and this vehicle speed is displayed on the liquid crystal display 21. In other words, the liquid crystal display 21 emits display light representing the vehicle speed as information.

  The display light emitted from the liquid crystal display 21 (a real image 21A of the vehicle speed display) is incident on the plane mirror 22 along the optical path P1 as shown in FIGS. 1 and 2A, and is directed toward the concave mirror 23 along the optical path P2 by the plane mirror 22. reflect. The display light (the real image 21A of the vehicle speed display) is magnified about 5 times by the concave mirror 23 and reflected toward the half mirror 3 along the optical path P3. The display light (real image 21A) magnified about 5 times is magnified about 1.2 times by the half mirror 3, and enters the eyes M of the viewer according to the optical path P4 as shown in FIG.

  Thereby, the viewer recognizes the virtual image 21B of the vehicle speed display enlarged about 6 times in front of the half mirror 3 (left direction indicated by the arrow in FIG. 1). At this time, since the viewer can also recognize the scenery through the half mirror 3, the viewer can recognize the virtual image 21B of the vehicle speed display superimposed on the scenery on the half mirror 3.

  Here, as shown in FIG. 3, the apparatus main body 2 (that is, the casing 26) of the HUD 1 is integrated with the air conditioning duct 61-63, and the air conditioning air that circulates in the air conditioning duct 61-63. However, since it flows through the inside of the apparatus main body, the inner surface 24b, the plane mirror 22, and the concave mirror 23 of the dustproof cover 24 are exposed to air-conditioned air. For example, the dust cover 24, the plane mirror 22, and the concave mirror 23 are cold if cold air-conditioned air (cold air) flows inside the apparatus main body 2 (casing part 26), and warm air-conditioned air (hot air) is If it flows inside the main body, it gets warm.

  For this reason, if the warm air suddenly flows inside the apparatus main body 2 according to the air flow paths CA1 and CA2 when the dustproof cover 24, the plane mirror 22 and the concave mirror 23 are cold, moisture (water vapor) in the warm air. However, there is a risk that condensation (cloudiness) may occur on the inner surface 24b of the cold dustproof cover 24, the reflecting surface 22a of the plane mirror 22, and the reflecting surface 23a of the concave mirror 23.

  However, in the HUD 1 according to the present invention, the antifogging film 25 having translucency and water absorption is formed on these surfaces 22a, 23a, and 24b. To be absorbed. Thus, the moisture in the warm air is absorbed by the anti-fogging film 25 before the moisture (water vapor) in the warm air comes into contact with this surface and causes condensation (cloudiness).

  For this reason, the upper surface of the anti-fogging film | membrane 25 is always dried, and it can prevent that dust adheres to this. As a result, in the HUD 1 including the apparatus main body 2 integrated with the air conditioning duct 61-63, the display can be prevented from being reduced due to the occurrence of condensation. Moreover, since this anti-fogging film | membrane 25 has translucency, it does not disturb the display function of HUD1.

  In addition, if it is only for preventing dew condensation (cloudiness), the anti-fogging film | membrane which has hydrophilic property can be formed in these surfaces 22a, 23a, 24b. However, in this case, moisture (water vapor) in the warm air condenses on the anti-fogging film to form a water film, thus preventing condensation (fogging), but dust adheres to the water film. This hinders the display function of the HUD 1.

  A feature of the present invention is that in the HUD 1 including the apparatus main body 2 integrated with the air conditioning duct 61-63, an anti-fogging film 25 having translucency and water absorption is formed on these surfaces 22a, 23a, 24b. Thus, the upper surface of the anti-fogging film 25 can be always dried even under the conditions of dew condensation to prevent dew condensation (fogging), thus preventing dust from adhering to the upper surface of the anti-fogging film 25. it can.

  In the above example, the antifogging film 25 is formed on all of the inner surface 24b of the dustproof cover 24, the reflecting surface 22a of the flat mirror 22, and the reflecting surface 23a of the concave mirror 23. In the surface on which the antifogging film 25 is formed, the display of the vehicle head-up display device 1 can be prevented from being lowered due to the occurrence of condensation.

  As described above, the head-up display device 1 for a vehicle according to the present embodiment constitutes part of the air-conditioning air passage CA1, CA2 by being connected to the air-conditioning duct 61-63 for air-conditioning the vehicle interior. A head-up display device 1 for a vehicle having a device main body 2 that has a light-transmitting dust-proof cover 24 and a display light that is disposed behind the dust-proof cover 24 and represents information. A display 21 that emits light, and a flat mirror 22 and a concave mirror 23 that are arranged behind the dustproof cover 24 and that reflect display light from the display 21 through the dustproof cover 24 toward the windshield 5 are provided. The antifogging film 25 having translucency and water absorption is provided on at least one of the inner surface 24b of the dustproof cover 24, the reflecting surface 22a of the flat mirror 22, and the reflecting surface 23a of the concave mirror 23. Made is configured to have.

  Thereby, in the head-up display device 1 for vehicles provided with the apparatus main body part 2 integrated with the air-conditioning duct 61-63, the display can be prevented from being reduced due to the occurrence of condensation.

  If the magnification of the virtual image 21B relative to the real image 21A can be reduced, the concave mirror 23 can be a plane mirror.

  Moreover, it is not necessary to limit to the liquid crystal display 21, and it can be set as another display.

  In the above-described example, the liquid crystal display 21 emits display light representing vehicle speed as information, but is not limited thereto, and emits display light representing other information such as the engine speed and travel distance. Can be configured.

  In the above-described example, the base portion 24a of the dust cover 24 is formed from a polycarbonate-based resin, but can be formed from an acrylic resin or other light-transmitting resin.

FIG. 1 is a schematic diagram showing an overall configuration of a vehicle head-up display device 1 according to an embodiment of the present invention. 2A is a schematic perspective view showing the configuration of the apparatus main body 2 shown in FIG. 1, and FIG. 2B is a sectional view taken along line IIB-IIB in FIG. FIG. 3 is a schematic perspective view showing a state where the apparatus main body 2 shown in FIG. 1 is integrated with the air conditioning duct 61-63. FIG. 4 is a circuit configuration diagram illustrating an electrical circuit configuration of the vehicle head-up display device 1 (device main body 2) according to an embodiment of the present invention.

Explanation of symbols

1 Vehicle head-up display (HUD)
2 Main unit, 21 Liquid crystal display (display)
22 plane mirror (reflecting mirror), 22a reflecting surface 23 concave mirror (planar mirror, reflecting mirror), 23a reflecting surface 24 dustproof cover, 24a base, 24b inner surface, 24c hard coat film 25 antifogging film, 26 casing part, 27 control device, 3 Half mirror 4 Instrument panel, 5 Wind shield 61-63 Air conditioning duct, 64 Main defroster outlet 7 Speed sensor, 8 Ignition switch, 9 Battery

Claims (5)

A vehicle head-up display device comprising a device main body part that constitutes a part of an air conditioning air passage by being connected to an air conditioning duct for air conditioning of a vehicle interior,
The apparatus main body includes a light-proof dust-proof cover, a display that is disposed behind the dust-proof cover and emits display light representing information, and is disposed behind the dust-proof cover and from the display A reflective mirror that reflects the display light toward the windshield through the dust cover;
An automotive anti-fogging film having translucency and water absorption is formed on at least one of the inner surface of the dust-proof cover and the reflecting surface of the reflecting mirror.   The vehicle head-up display device according to claim 1, wherein the antifogging film is formed of a polyurethane-based resin. The dustproof cover on which the antifogging film is formed includes a hard coat film for preventing scratches on the surface opposite to the inner surface,
The vehicle head-up display device according to claim 1, wherein the hard coat film is formed simultaneously with the anti-fogging film.   The vehicle head-up display device according to any one of claims 1 to 3, wherein the reflecting mirror on which the antifogging film is formed is at least one of a plane mirror and a concave mirror.   5. The vehicle head-up display device according to claim 1, wherein the dust-proof cover on which the anti-fogging film is formed is formed of a polycarbonate resin or an acrylic resin. .

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