JP5588690B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp having a dew condensation prevention structure.

  As an example of this type of vehicle lamp, there has been proposed a structure in which a dew condensation prevention mechanism 50 as shown in FIG. 6 is provided at a position just above the light source bulb of a lamp body equipped with the light source bulb. .

  In the dew condensation prevention mechanism 50, a cylindrical body 52 having an elliptical cross section extending from the lamp body 60 is provided in a waterproof wall 51 having an elliptical cross section extending rearward from the lamp body 60. A cap 53 is fitted to the tip of the.

The cylindrical body 52 is formed with a slit 54 extending from the tip toward the lamp body 60 on the lower side wall, and the inside is partitioned into an upper space S ₁ and a lower space S ₂ by a partition wall 55 extending from the lamp body 60. In addition, the upper space S ₁ is connected to an air hole 56 provided in the lamp body 60.

There is a gap C between the cap 53 and the tip of the cylindrical body, and a part of the slit 54 is exposed in the waterproof wall 51 without being blocked by the cap 53, and is connected to the lamp via the air hole 56. the upper space S ₁ to 58 communicating with the body, are made lower space S ₂ Togae which communicates with the outside of the cylindrical body 52 via the upper space S ₁ and the communicating and the slit 54 through the gap C.

Thereby, warm air in the lamp body 58 when the light source bulb 57 is turned on is dissipated from the air hole 56 to the outside of the cylindrical body 52 through the path of the upper space S ₁ , the gap C, the lower space S ₂ , and the slit 54. At the same time, external cold air is introduced into the lamp body 58 through the same path. As a result, an increase in the temperature of the air in the lamp body 58 is suppressed, and condensation on the front lens 59 is prevented.

  Moreover, the path | route of warm air and cold air is defined in the maze shape as mentioned above, and has the structure where the water outside the cylinder 52 does not easily enter the lamp body 58 (see, for example, Patent Document 1). ).

JP 10-340603 A

  By the way, the vehicular lamp provided with the dew condensation prevention mechanism having the above configuration has a maze-like complicated structure for the dew condensation prevention mechanism to prevent the intrusion of water. The structure becomes complicated.

  As a result, there is a risk that it will be difficult to respond to a rapid production plan due to a longer mold manufacturing period. In addition, the manufacturing cost of the mold rises and the cost of the molded product (lamp body) rises.

  In addition, the manufacturing cost increases due to the increase in the number of parts due to the adoption of individual parts (caps).

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to provide a vehicular lamp that can prevent the occurrence of condensation without increasing the number of parts and with a simple structure. It is to provide.

  In order to solve the above-mentioned problem, in the invention described in claim 1 of the present invention, a lamp chamber is formed by a housing having an opening and an outer lens arranged so as to close the opening of the housing. A light source supported by the housing in the room and a reflector that surrounds the light source and has an opening, reflects light from the light source, and irradiates the light toward the outer lens through the opening. A plurality of independent sections surrounded by a member other than the outer lens and provided with a gap along the outer lens and between the outer lens in the lamp chamber. And a section located closest to the light source communicates with a space surrounding the light source.

Further, the invention described in claim 2 of the present invention, in claim 1, wherein the housing further comprises a arranged inner lens between said outer lens, the compartment the housing, the reflector and the inner It is constituted by a combination selected from lenses.

  Further, in the invention described in claim 3 of the present invention, in any one of claim 1 or claim 2, the section closest to the light source is partially within the section. It has a labyrinth structure having partition walls to divide.

  Further, in the invention described in claim 4 of the present invention, in any one of claims 1 to 3, the outer lens has a shape that wraps around to the side from the lamp irradiation direction of the vehicle, The lateral length of the outer lens is at least three times the lateral diameter of the opening end of the reflector.

  The present invention relates to a vehicular lamp in which a light source and a reflector that reflects light from the light source toward a direction of the outer lens are accommodated in a lamp chamber formed by a housing and an outer lens. A plurality of independent sections surrounded by members other than the outer lens with a gap along the lens and between the outer lenses are adjacent to each other, and the section closest to the light source surrounds the light source. I tried to communicate.

  Therefore, the warm air generated by the heat when the light source is turned on is confined in the section communicating with the space surrounding the light source and is prevented from flowing into other sections along the outer lens.

  As a result, with a simple structure without increasing the number of parts, it is possible to prevent the outer lens from being exposed to the area excluding the portion that contacts the space surrounding the light source, and the outer lens is fogged or condensed. In other words, it has an excellent effect that visibility by irradiation light and appearance from the outside are not impaired.

It is a front view of an embodiment concerning the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a dimension explanatory view of an embodiment. It is explanatory drawing which shows the flow of the warm air of embodiment. Illustration of conventional example

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIG. 1 to FIG. 5 (the same reference numerals are given to the same portions). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  1 is a front view of a vehicular lamp, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. The basic configuration of the vehicular lamp 1 according to the present embodiment includes a lamp (light source lamp) 2 serving as a light source, a housing 3 on which the light source lamp 2 is mounted, a reflector 4 held on the housing 3 so as to surround the light source lamp 2, It comprises an outer lens 5 extending along the housing 3 from the front of the light source lamp 2 and an inner lens 6 disposed between the housing 3 and the outer lens 5.

  Hereinafter, the details of the light source lamp 2, the housing 3, the reflector 4, the outer lens 5, and the inner lens 6 constituting the vehicular lamp 1 and the positional relationship with each other will be described. In addition, terms indicating directions such as “front”, “rear”, “upper”, “lower”, “lateral” and the like used in the following description are “irradiation direction” in a state in which the vehicular lamp is mounted on the vehicle. , “Direction opposite to the irradiation direction”, “direction opposite to the road surface direction”, “road surface direction”, and “vehicle width direction”.

  The light source lamp 2 has a structure in which the bulb 10 is supported by the bulb socket 11 and the lead wire led out from the electrode in the bulb 10 is electrically connected to the external connection terminal of the socket 11.

  The housing 3 includes three surfaces: a rear side wall 31, an upper side wall 32 that rises substantially vertically from the upper end of the rear side wall 31 and extends forward, and a lower side wall 33 that rises substantially vertically from the lower end of the rear side wall 31 and extends forward. It consists of an outer peripheral wall, and has a shape having an opening on the side facing the rear side wall 31 (see FIG. 3).

  The rear side wall 31 is provided with the light source lamp 2 and rises substantially vertically from a first rear wall portion 31a that is substantially perpendicular to the optical axis X of the light source lamp 2, and from a lateral end portion on the center side of the first rear wall portion 31a. The second rear wall portion 31b extending forward, the attachment portion 31d extending laterally from the front end portion of the second rear wall portion 31b, and the rear end rising substantially vertically from the lateral end portion on the lateral side of the first rear wall portion 31a The third rear wall portion 31c extends in the direction (see FIG. 2).

  The length L2 of the third rear wall portion 31c is more than three times the length L1 of the first rear wall portion 31a (see FIG. 4), and the first rear wall portion 31a has a partition wall portion extending forward. 31aa is provided, and the third rear wall portion 31c has a step portion 31ca at some place.

  The reflector 4 is supported by the first rear wall portion 31a to which the light source lamp 2 is mounted, and covers the light source lamp 2 obliquely rearward, laterally, and obliquely forward, and has a reflecting portion 41 having an opening in front of the light source lamp 2. And an extension portion 42 extending from a part of the opening end portion 4a to the middle of the third rear wall portion 31c along the first rear wall portion 31a and the third rear wall portion 31c.

  The surface (reflecting surface) 41a of the reflecting part 41 of the reflector 4 on the side that covers the light source lamp 2 and reflects the light from the light source lamp 2, and the first rear wall part 31a and the third rear wall part 31c of the extension part 42. The surface (bright reflection surface) 42a opposite to the side opposite to is subjected to a metallic-like bright reflection process by chrome plating or the like.

  The inner lens 6 is disposed along the third rear wall portion 31c on a substantially extended line of the distal end portion 42b of the extension portion 42, and one end portion 6a side of the inner lens 6 is partly the distal end of the extension portion 42. The other end 6b is fitted to the end 31cb of the third rear wall 31c, and is positioned so as to close the gap between the extension 42 and the third rear wall 31c. Has been.

  Further, the outer lens 5 is disposed so as to go sideways along the extension portion 42 and the inner lens 6 from the opening front of the reflector 4, and both end portions 5 a and 5 b of the outer lens 5 are fitted in the housing 3. Yes.

  In this case, the outer lens 5 has a shape that wraps around from the front of the vehicle, but the lateral length M2 of the outer lens 5 is equal to the lateral diameter M1 of the opening end 4a of the reflecting portion 41 of the reflector 4. The length is three times or more (see FIG. 4).

  By the way, the positional relationship between the end 6a of the inner lens 6 on the one end 6a side, the third rear wall 31c of the housing 3 and the extension 42 of the reflector 4 is as described above. A part of the portion 6a is fitted to the tip end portion 42b of the extension portion 42, and is positioned so as to close the gap between the extension portion 42 and the third rear wall portion 31c (see FIG. 2). . At the same time, the end portion 6 a of the inner lens 6 is positioned so as to overlap the stepped portion 31 ca of the third rear wall portion 31 c of the housing 3.

  That is, the gap formed by the third rear wall portion 31 c of the rear side wall 31 of the housing 3 and the extension portion 42 of the reflector 4 is closed by the one end portion 6 a side of the inner lens 6. Thereby, the space formed by the upper side wall 32, the lower side wall 33, the first rear wall portion 31a and the third rear wall portion 31c of the housing 3, the reflection portion 41 and the extension portion 42 of the retractor 4, and the inner lens 6. Is divided into two independent spaces on the end 6a side of the inner lens 6 (see FIGS. 2 and 3).

  The first section 45 includes the upper side wall 32, the lower side wall 33, the first rear wall portion 31a and the third rear wall portion 31c of the housing 3, the reflecting portion 41 and the extension portion 42 of the retractor 4, and the end portion of the inner lens 6. The second section 46 is composed of the upper side wall 32, the lower side wall 33, the third rear wall portion 31 c of the housing 3, and the inner lens 6.

  Of the first compartment 45 and the second compartment 46, the first compartment 45, which is close to the light source lamp 2, extends forward from the first rear wall portion 31a of the housing 3 into the compartment and partially passes through the compartment. It has a labyrinth structure having partition walls 31aa that are divided in a regular manner.

  In the vehicular lamp 1 configured as described above, as shown in FIG. 5, when the light source lamp 2 is turned on, the heat generated by the light source lamp 2 increases the temperature of the air in the reflecting portion 41 of the reflector 4, Warm air flows into the space area 45a on the light source lamp 2 side of the internal space of the first section 45 across the partition wall 31aa. The warm air flowing into the space area 45a of the first section 45 is inhibited by the partition wall 31aa, the flow velocity is suppressed, and the decelerated warm air flows through the gap between the partition wall 31aa and the extension part 42 of the retractor 4. Then, it flows into the space region 45b opposite to the light source lamp 2 across the partition wall 31aa.

  Most of the warm air flowing into the space region 45b of the first section 45 causes convection in the space region 45b and stays in the space region 45b. Therefore, most of the heat generated when the light source lamp 2 is turned on stays in the first section 45 located on the side near the light source lamp 2 of the heat generation source, is far from the light source lamp 2 and on the side of the outer lens 5. Little flows into the second compartment 46 located along the long wraparound.

  Therefore, almost no warm air flows into the gap 47 formed by the outer lens 5 and the extension portion 42 of the reflector 4 and the gap 48 formed by the outer lens 5 and the inner lens 6.

  As a result, the outer lens is not fogged or dewed by heat generated when the light source lamp is turned on, and the visibility and appearance from the outside are not impaired. Such an excellent effect can be realized with a simple structure without increasing the number of parts by configuring the vehicular lamp as described above.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source lamp 3 ... Housing 4 ... Reflector 4a ... Opening end part 5 ... Outer lens 5a ... End part 5b ... End part 6 ... Inner lens 6a ... End part 6b ... End part 10 ... Bulb 11 ... Socket 31 ... Rear side wall 31a ... 1st rear wall part 31aa ... Partition part 31b ... 2nd rear wall part 31c ... 3rd rear wall part 31ca ... Step part 31cb ... End part 31d ... Mounting part 32 ... Upper side wall 33 ... Lower side wall 41 ... Reflection part 41a ... Reflection surface 42 ... Extension part 42a ... Bright reflection surface 42b ... Tip part 45 ... First section 45a ... Spatial area 45b ... Spatial area 46 ... Second compartment 47 ... Gap 48 ... Gap

Claims (4)

A lamp chamber is formed by a housing having an opening and an outer lens arranged so as to close the opening of the housing, and includes a light source supported by the housing in the lamp chamber and surrounding the light source and having an opening. A vehicular lamp including a reflector that reflects light from the light source and irradiates the light toward the outer lens through the opening;
In the lamp chamber, a plurality of independent sections surrounded by members other than the outer lens with a gap along the outer lens and between the outer lens are adjacent to each other,
A vehicular lamp characterized in that a section closest to the light source communicates with a space surrounding the light source. An inner lens disposed between the housing and the outer lens;
Said compartment said housing, said reflector and the vehicle lighting device according to claim 1, characterized in that it is constituted by a combination selected from among the inner lens.   The section closest to the light source has a labyrinth structure having a partition wall part that divides the section partially in the section. Vehicle lamp.   The outer lens has a shape that wraps around from the lamp irradiation direction of the vehicle, and the lateral length of the outer lens is at least three times the lateral diameter of the opening end of the reflector. The vehicular lamp according to any one of claims 1 to 3.

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