JP2012003958A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight for a vehicle capable of preventing a fogging phenomenon generated on an outer lens in a headlight for a large vehicle with a defogging coating film applied on the outer lens, and capable of quickly removing the generated fog.SOLUTION: The headlight for a vehicle comprises an upper-stage lamp part 4 with a running lamp 8 arranged, and a lower-stage lamp part 5 with a low-beam lamp 7 arranged. Mutual convection flows are blocked by providing a separation plate 6 between the upper-stage lamp part 4 and the lower-stage lamp part 5, and a convection flow heading to a defogging coating area R with a low surfactant of the outer lens 2 is restrained by a protrusion part 9 fitted to an extension 14 of the upper-stage lamp part 4, and a breathing effect for the upper-stage lamp part 4 is obtained independently by two breathing holes 12 fitted to a rear face side of a housing 3 of the upper-stage lamp part 4, whereby, fog on the surface of the outer lens 2 is prevented so as to enable to improve clarity.

Description

  The present invention relates to a vehicle headlamp having a traveling lamp and a passing lamp, and more particularly to a vehicle headlamp having an anti-fogging function.

  Conventionally, this type of vehicle headlamp is known from, for example, Patent Document 1. The vehicle headlamp known from Patent Document 1 includes a low beam unit and a high beam unit. In addition, it has a rectifying plate for blocking moisture generated on the low beam irradiation surface of the outer lens from flowing into the high beam unit side from the gap between the extension material and the low beam unit, and a breathing hole formed on the back of the housing. The convection from the low beam unit to the high beam unit is partly restricted to increase the convection in an arbitrary direction to prevent dew condensation and to prevent the occurrence of fogging by the breathing function of the breathing hole.

JP 2004-119198 A

  However, in a two-lamp type vehicle headlamp equipped with a low beam unit and a high beam unit as described in Patent Document 1, the volume of the housing increases as the size of the vehicle headlamp increases. It will be. As the volume of the housing increases, it becomes difficult to regulate convection, and it is difficult to prevent condensation and prevent fogging.

  Furthermore, in a large-sized vehicle headlamp, fogging is likely to occur at specific locations such as the corners of the outer lens, and the lamp itself has a large capacity, so that air convection does not spread sufficiently and the cloudy There was a problem that it was difficult to prevent and eliminate.

  Conventionally, a vehicular headlamp having a structure in which an outer lens is provided with an anti-fogging coating film to prevent fogging is also known. However, even in such a vehicle headlamp, in the upper region of the vehicle headlamp, air that has been heated and contains a large amount of water is directed toward the upper portion of the lamp, and therefore includes a general surfactant. In the anti-fogging coating film, water retention on the surface of the outer lens is saturated and water dripping is likely to occur. Then, after the water dripping is dried, a dripping trace remains, and the dripping trace deteriorates the appearance of the outer lens, and the deterioration of quality due to the dripping trace has been a problem.

  Therefore, a structure in which an anti-fogging coating film is disposed without using a surfactant as a part of the outer lens is conventionally known as a countermeasure against water dripping by such an anti-fogging coating film. However, when no surfactant is used in the antifogging coating film, there is a problem that the antifogging performance is lowered and a sufficient antifogging effect cannot be obtained.

  Therefore, the present invention has been made in view of the above problems, and is generated in an outer lens in a large-capacity vehicle headlamp in which a traveling lamp and a passing lamp are arranged separately in an upper stage and a lower stage. An object of the present invention is to provide a vehicular headlamp that can prevent the fogging phenomenon that occurs and can quickly eliminate the fogging that occurs.

  In order to solve the above-described problem, a vehicle headlamp according to the present invention includes a lamp housing, an outer lens that is disposed so as to close a front opening of the lamp housing, and that defines a lamp chamber therein, and A sorting plate made of a metal member arranged in the lamp chamber so as to sort the lamp chamber above and below the upper lamp portion and the lower lamp portion, and provided in the lamp chamber corresponding to at least the upper lamp portion It is characterized by comprising two breathing holes, a difference lamp and a traveling lamp arranged separately in the upper lamp section and the lower lamp section, respectively.

  According to this configuration, the lamp chamber is defined by the lamp housing and the outer lens, and the upper lamp portion and the lower lamp portion are separated by the sorting plate made of the metal member. The convection between them is interrupted. By shutting off the convection, for example, the heat generated when the passing lamp is lit in the lower lamp section warms the moist air in the lower lamp section, and the heated air rises and enters the upper lamp section. To prevent it. Further, it is possible to effectively prevent the cloudy phenomenon from occurring in the outer lens on the upper lamp portion side due to the warm and humid air.

  In addition, when any one of the upper lamp unit and the lower lamp unit is lit, the heat moist air is warmed, and even if a clouding phenomenon occurs in front of the outer lens of the non-lighting lamp unit, Since at least two breathing holes are provided in the upper lamp portion where air easily enters, even if there is moist air that has entered, ventilation can be quickly performed from the breathing hole. Further, the two breathing holes provide an independent breathing action in the upper lamp portion, and suppress the occurrence of the fogging phenomenon of the outer lens.

  In the above configuration, the traveling lamp is disposed in the upper lamp section, the passing lamp is disposed in the lower lamp section, and each lamp section is provided between the upper lamp section and the lower lamp section. An extension disposed so as not to block light from the light, an antifogging coating film using a low surfactant provided on the outer lens, and an outer peripheral edge of the extension corresponding to the antifogging coating portion. It is possible to adopt a configuration in which a part of the protrusion is formed to protrude toward the outer lens side.

  According to this configuration, among the anti-fogging coating film provided on the outer lens, a protrusion toward the outer lens is provided on a part of the outer peripheral edge of the extension corresponding to the coating portion with the low surfactant. The flow of air from the housing side to the outer lens side of the vehicular headlamp can be restricted, and fogging of the painted portion due to the low surfactant with low antifogging performance can be suppressed. In addition, by controlling the flow of moist air from the housing side toward the anti-fogging coating portion by the low surfactant of the outer lens by the protrusion, the occurrence of fogging phenomenon of the outer lens is suppressed and the defogging property is reduced. Can be increased.

  In the above-described configuration, the two breathing holes provided in the upper lamp portion can be configured to be provided on the rear surface of the housing so as to be positioned substantially diagonally.

  According to this configuration, since the two breathing holes provided in the upper lamp portion are provided on the rear surface of the housing so as to be located substantially diagonally, the space in the upper lamp portion sandwiched between the protrusion and the sorting plate. In addition, a sufficient breathing effect can be brought about, and the fogging of the outer lens can be suppressed and the defogging property can be improved.

  According to the present invention, the lamp chamber defined by the lamp housing and the outer lens is sorted into the upper lamp part and the lower lamp part by the sorting plate made of a metal member, and the convection between the upper lamp part and the lower lamp part is achieved. For example, the heat generated when the passing lamp is lit in the lower lamp section warms the moist air in the lower lamp section, and the heated air rises to the upper lamp section side. It is possible to effectively prevent the fogging phenomenon from occurring in the outer lens on the upper lamp portion side due to the invading and humid air that has entered after being warmed.

  In addition, when any one of the upper lamp unit and the lower lamp unit is lit, the heat moist air is warmed, and even if a clouding phenomenon occurs in front of the outer lens of the non-lighting lamp unit, Since the upper lamp part where air easily intrudes is provided with two breathing holes, the moist air that has entered can be ventilated more quickly than the breathing holes, improving the defogging ability it can.

It is a front view of the vehicle headlamp in the embodiment of the present invention. FIG. 2 is a vertical sectional view taken along line AA in FIG. 1. It is a perspective view which shows the specific structure inside the housing of the vehicle headlamp in embodiment of this invention. It is a figure which expands and shows the protrusion part periphery structure in FIG. It is explanatory drawing of the anti-fog coating film provided in the vehicle headlamp in embodiment of this invention. It is a reverse view of the vehicle headlamp in embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

  1 to 6 show a vehicle headlamp according to an embodiment of the present invention, FIG. 1 is a front view of the vehicle headlamp, FIG. 2 is a longitudinal sectional view taken along line AA in FIG. FIG. 4 is a perspective view showing a specific configuration inside the housing of the vehicle headlamp, FIG. 4 is an enlarged view of the peripheral structure of the protrusion in FIG. 2, and FIG. 5 is a protection provided in the vehicle headlamp. FIG. 6 is a rear view of the vehicular headlamp.

  1 to 6, vehicle headlamps 1 are lamps provided at left and right ends of a front portion of a vehicle when viewed from the front of the vehicle. In the drawings, the lamps on the left side when viewed from the front are shown as representatives. . Therefore, when the vehicle headlamp 1 is viewed from the front side of the vehicle, the vehicle headlamp 1 appears in a state of being disposed on each of the left and right sides of the front portion of the vehicle.

  Each of the vehicle headlamps 1 is a headlamp in which a lamp chamber 22 is defined by an outer lens 2 and a housing 3, and the lamp chamber 22 is sorted vertically by a sorting plate 6. An upper lamp portion 4 having a lamp chamber 22a in which a traveling lamp 8 and a turn lamp 15 are disposed is formed on the upper side of the plate 6, and a lamp chamber 22b in which a passing lamp 7 and a clearance 16 are disposed on the lower side. A lower lamp portion 5 is formed. 2 and 5, in order to facilitate understanding of the internal arrangement structure of the vehicle headlamp 1, the interior of the vehicle headlamp 1 is viewed through the outer lens 2. .

  Further, in each of the lamp chambers 22a and 22b of the lamp sections 4 and 5, as shown in FIGS. 3 and 6, a plurality of (two in the present embodiment) opened on the back side of the housing 3 are provided. A breathing hole 12 is provided. In the upper ramp portion 4 and the lower ramp portion 5, four breath holes 12 are formed, one each at the lower corner portion on the inner side of the vehicle and one at the upper corner portion on the outer side of the vehicle. Has been. These breathing holes 12 have a function of exhausting (ventilating) air in the lamp chamber 22a of the upper lamp section 4 and air in the lamp chamber 22b of the lower lamp lamp 5 by breathing effects. A filter or the like (not shown) is attached to the breathing hole 12 to prevent entry of dust, dust, moisture, etc. from the outside of the housing 3. These breathing holes 12 may be provided only on the upper lamp part 4 side without being provided in both the upper lamp part 4 and the lower lamp part 5, and the number thereof can be arbitrarily selected.

  The outer lens 2 is made of a light transmissive material, for example, a transparent synthetic resin material such as polycarbonate, and as shown in FIG. It is assembled on the front side so as to close the opening of the housing 3.

  As shown in FIG. 2, the outer lens 2 has a portion 2a corresponding to the upper lamp portion 4 and a portion 2b corresponding to the lower lamp portion 5, as well as the portions 2a and 2b. A step 18 is provided between them. The step portion 18 is formed as a recess that is lowered from the outer surface of the upper lamp portion 4 and the lower lamp portion 5 toward the rear of the vehicle, and the finisher 11 of the vehicle body 10 and the like are disposed in the step portion 18. .

  The finisher 11 is made of the same member as the bumper of the vehicle body 10, for example, and the surface is painted in the same color as the vehicle body 10. The finisher 11 is disposed so as to be substantially flush with the surfaces of the upper lamp portion 4 and the lower lamp portion 5 of the outer lens 2 and to close the concave portion formed by the step portion 18, that is, the opening surface of the step portion 18. Yes. Accordingly, the finisher 11 disposed in the step portion 18 decorates the upper lamp portion 4 and the lower lamp portion 5 in a state where the upper lamp portion 4 and the lower lamp portion 5 are divided into upper and lower parts, thereby improving the appearance. The inside of the lamp chamber 22 is prevented from being seen from the outside through the portion 18.

  In addition, as shown in FIG. 5, in the rear surface of the outer lens 2 and the region corresponding to the upper portion of the upper lamp portion 4 from the light source bulb 81, that is, the region R that is hatched in the drawing, In order to effectively suppress the occurrence of dripping or fogging, for example, an anti-fogging coating film 21 containing a low surfactant is applied.

  Examples of the antifogging coating film 21 containing a surfactant include a block polymer composed of a hydrophilic polymer portion and a hydrophobic polymer portion, and a kraft weight composed of a hydrophilic polymer portion and a hydrophobic polymer portion. There is a resin film-forming composition having a composition in which one or more copolymers selected from coalesces contain a surfactant (see, for example, JP-A-2-255854).

  Further, in the lamp chamber 22, the lamp chamber 22a of the upper lamp section 4 provided with the passing lamp 7 and the clearance lamp 16 and the lamp chamber 22b of the lower lamp section 5 provided with the driving lamp 8 and the turn lamp 15 are provided. The partitioning plate 6 that is partitioned is made of a metallic flat plate member, and is provided behind the step portion 18 of the outer lens 2 and behind the finisher 11. The rear edge of the sorting plate 6 is formed so as to substantially coincide with the inner surface of the housing 3, the rear edge is brought into contact with the housing 3, and the front edge is outer as shown in FIG. The lens 2 is attached so as to extend to a position near the surface of the lens 2. At the time of mounting, the upper lamp section 4 and the lower lamp section 5 are partly bent according to the lamp shapes of the upper lamp section 4 and the lower lamp section 5 and arranged substantially horizontally to partition the upper lamp section 4 and the lower lamp section 5. Then, the convection generated between the upper lamp portion 4 and the lower lamp portion 5 is blocked by the partition, and then the attachment portion 13 is fixed to the housing 3 by using a screw screw or an attachment pin. It has been.

  Further, a reinforcing bead 19 for increasing the strength is provided on the surface of the sorting plate 6, and the reinforcing bead 19 can prevent chatter noise caused by vibration of the vehicle. When the lower lamp unit 5 is lit, the sorting plate 6 heats the humid air in the lamp chamber 22b with the heat generated in the lower lamp unit 5, and the heated air rises to increase the upper lamp. Moist air entering the portion 4 side is blocked, and the portion of the outer lens 2 on the upper lamp portion 4 side, that is, the upper portion 2a is prevented from being fogged.

  If the humid air in the lower lamp section 5 enters the upper lamp section 4 through the gaps in the sorting plate 6, fogging occurs in the region R provided with the anti-fogging coating containing the low surfactant. In some cases, however, the cloudiness that has occurred can be quickly removed by the respiration (ventilation) of the two breathing holes 12 provided in the upper lamp portion 4.

  The housing 3 is made of an opaque synthetic resin material, and supports the passing lamp 7 and the traveling lamp 8 so that the optical axis can be adjusted in the vertical and horizontal directions by an optical axis adjusting device (not shown). Yes.

  As shown in FIGS. 1, 2 and 5, the upper lamp portion 4 includes the traveling lamp 8, another lamp provided adjacent to the side thereof, such as a turn lamp 15, an extension 14, and the like. The two breathing holes 12 are arranged on the back surface of the housing 3.

  As shown in FIGS. 1 and 5, the traveling lamp 8 has a light distribution pattern for traveling by using the light source bulb 81 and a reflector 82 having a parabolic reflecting surface for the light emitted from the light source bulb 81. It is configured as a vehicular lamp that irradiates forward.

  As shown in FIG. 2, the turn lamp 15 provided adjacent to the side of the traveling lamp 8 is provided on the vehicle inner side of the traveling lamp 8, and includes a light source 15a made of a colored lamp such as an amber bulb (not shown). The reflector 15b irradiates the light of the light source 15a forward and sideward, and is configured as a vehicle lamp that blinks in conjunction with the vehicle direction indicator.

  As shown in FIGS. 1, 2, 4 and 5, the extension 14 on the side of the upper lamp side portion 4 has a shape along the outer shape of the housing 3, and includes a traveling lamp 8 and a turn lamp 15. And the housing 3 are arranged at positions that do not block the light distribution of the travel lamp 8 and the turn lamp 15 to decorate the travel lamp 8 and the turn lamp 15, thereby improving the appearance. In addition, the interior of the vehicle headlamp 1 can be prevented from being seen around the traveling lamp 8 and the turn lamp 15.

  Further, as shown in FIG. 4, a protruding portion 9 is integrally formed on the upper edge portion of the extension 14 provided in the upper lamp portion 4 so as to protrude toward the outer lens 2. Further, an anti-fogging coating film 21 containing a low surfactant is applied to the back surface portion of the outer lens 2 corresponding to the portion where the projections 9 are formed.

  As shown in FIGS. 1 and 2, the lower lamp portion 5 includes a passing lamp 7, another lamp provided adjacent to the side thereof, for example, the clearance lamp 16, the extension 14, A breathing hole 12 is provided on the back surface of the housing 3.

  As shown in FIGS. 1 and 2, the passing lamp 7 condenses the irradiation light from the light source bulb 71a on the rear focal position of the projection lens 74 by the reflector 71b, and places the irradiation light on the rear focal position of the projection lens 74. Light that is not shielded by the provided shade 73 passes through the projection lens 74 and is configured as a projector-type vehicular lamp that is irradiated forward of the vehicle as a passing light distribution pattern. The projection lens 74 is held by a frame 75, and the shade 73 is sandwiched between the reflector 71b and the frame 75.

  As shown in FIG. 1, the clearance lamp 16 provided adjacent to the side of the passing lamp 7 is provided at a position outside the vehicle of the passing lamp 7, and a clearance lamp is formed by a light source bulb and a reflector. As a light distribution.

  As shown in FIGS. 1, 2, 4, and 5, the extension 14 on the lower lamp portion 5 side has a shape along the outer shape of the housing 3, and the passing lamp 7, the clearance lamp 16, and the housing 3. , And at a position where the light distribution of the passing lamp 7 and the clearance lamp 16 is not obstructed, thereby preventing the interior of the vehicular headlamp 1 from being seen.

  Therefore, according to the vehicle headlamp 1 configured as described above, the inside of the lamp chamber 22 formed by the lamp housing 3 and the outer lens 2 is formed by the sorting plate 6 made of a metal member. Since the convection between the upper lamp section 4 and the lower lamp section 5 is interrupted by being divided into the section 4 and the lower lamp section 5, for example, the heat generated when the passing lamp 7 is lit in the lower lamp section 5 The moist air in the lower lamp section 5 is warmed, and the warmed air is prevented from rising and entering the upper lamp section 4 side. Further, it is possible to effectively prevent the fogging phenomenon from occurring in the upper portion 2a of the outer lens 2 on the upper lamp portion 4 side by the warm and humid air.

  Further, when any one of the upper lamp section 4 and the lower lamp section 5 is lit, the moist air is warmed by the heat, and a clouding phenomenon occurs on the front surface of the outer lens 2 of the lamp section on the non-lighting side. However, since the upper lamp portion 4 in which warm air easily intrudes is provided with two breathing holes 12, even if there is moist air that has invaded, the air is ventilated more quickly than the breathing holes 12. It is possible to improve the defogging property.

  Further, since a protrusion 9 directed toward the outer lens 2 is provided on a part of the outer peripheral edge of the extension 14 corresponding to the portion to be coated with the low surfactant, this protrusion 9 is the housing of the vehicle headlamp 1. By restricting the air flow from the 3 side to the outer lens 2 side, it is possible to suppress the fogging of the coating portion due to the low surfactant having a low antifogging performance. Further, by restricting the flow of moist air from the housing 3 side toward the anti-fogging coating portion by the low surfactant of the outer lens 2 by the protrusion 9, the occurrence of the fogging phenomenon of the outer lens 2 is suppressed, It is possible to improve the reversibility of fogging.

  In addition, since at least two breathing holes 12 provided in the upper lamp portion 4 are provided on the rear surface of the housing 3 so as to be located substantially diagonally, the upper lamp portion sandwiched between the protrusion 9 and the sorting plate 6. 4 can provide a sufficient breathing effect in the space 4 (light chamber 22a), and the fogging of the outer lens 2 can be further suppressed to improve the clouding resolution.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Outer lens 2a Upper part 2b Lower part 3 Housing 4 Upper lamp part 5 Lower lamp part 6 Sorting board 7 Passing lamp 71a Light source bulb 71b Reflector 73 Shade 74 Projection lens 75 Frame 8 Running lamp 81 Light source bulb 82 Reflector 9 Protruding part 10 Car body 11 Finisher 12 Breathing hole 13 Mounting part 14 Extension 15 Turn lamp 16 Clearance lamp 17 Sealing part 18 Step part 19 Reinforcement bead 21 Antifogging coating film 22 Light room R Antifogging with low surfactant Paint film application area

Claims (3)

A lamp housing;
An outer lens formed by closing the front opening of the lamp housing and defining a lamp chamber inside;
A sorting plate made of a metal member disposed in the lamp chamber so as to sort the lamp chamber into the upper and lower parts of the upper lamp unit and the lower lamp unit;
Two breathing holes provided in the lamp chamber corresponding to at least the upper lamp section;
A difference lamp and a traveling lamp arranged separately in the upper lamp part and the lower lamp part,
A vehicle headlamp characterized by comprising:   The driving lamp is disposed in the upper lamp section, the passing lamp is disposed in the lower lamp section, and light from each lamp section is transmitted between the upper lamp section and the lower lamp section. An extension disposed so as not to block, an anti-fogging coating film using a low surfactant provided on the outer lens, and a part of the outer peripheral edge of the extension corresponding to the anti-fogging coating portion The vehicular headlamp according to claim 1, further comprising a protruding portion that protrudes toward the outer lens side.   The vehicle front according to claim 1, wherein the two breathing holes provided in the upper ramp portion are provided so as to be positioned substantially diagonally on the rear surface of the housing. Lighting.

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