JP2015118883A - Vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting appliance which simplifies a constitution, reduces a size and cost by reducing the number of part items, and can prevent the deterioration of light emitting efficiency and durability by enhancing a heat dissipation performance.SOLUTION: A base board 3 mounted with an LED 2 and a lens 4 which light emitted from the LED 2 permeates are directly fixed to each other, a lamp chamber 5 is formed between the base board and the lens, and the LED 2 is accommodated in the lamp chamber 5, thus constituting a vehicle lighting appliance 1. Furthermore, a grommet holding hole 4c is formed at the lens 4, a grommet 7 is fit and fixed into the grommet holding hole 4c, a chord 8 extending from a power supply at the outside of the lamp chamber 5 is inserted into the grommet 7, and pulled into the lamp chamber 5, and an end of the chord is electrically connected to the base board 3.

Description

  The present invention relates to a vehicular lamp in which a housing is omitted.

  A vehicular lamp such as a tail stop lamp is configured by accommodating at least a light source in a lamp chamber defined by a lens that covers a housing and an opening thereof. Recently, the light source is highly power-saving and highly durable. The thing using LED (light emitting diode) has appeared (for example, refer patent document 1).

  Here, the vehicle lamp proposed in Patent Document 1 will be described with reference to FIG.

  That is, FIG. 6 is a plan sectional view of the vehicular lamp proposed in Patent Document 1. The illustrated vehicular lamp (high-mount stop lamp) 101 is long in the left-right direction and narrow in the vertical direction, and in the front-rear direction. An LED substrate 106 on which a plurality of LEDs 105 are mounted is accommodated in a lamp chamber 104 defined by a body (housing) 102 having a shallow depth and a colorless and transparent lens 103 covering the front opening of the body 102. Configured.

  In this vehicular lamp 101, a grommet 107 is fitted and fixed in a grommet holding hole (not shown) opened in a part of the body 102, and a plurality of cords 108, 109, 110 extending from the LED board 106 are grommeted. 107 is led out of the lamp chamber 104 and its end is electrically connected to a power source (not shown) such as a battery. The plurality of cords 108, 109, and 110 drawn out of the lamp chamber 104 are hooked and held by hook-like left and right clampers 102 a that are integrally projected on the back surface of the body 102.

  Thus, in this vehicular lamp 101, the limiting resistor 111 for limiting the current supplied to the LED 105 is made independent from the LED substrate 106, and the limiting resistor 111 is connected to the cord 108 drawn out of the lamp chamber 104. Thus, the thermal influence on the LED 105 due to the heat generated by the limiting resistor 111 is reduced, and the LED substrate 106 is downsized.

JP 2003-115208 A

  Similar to other conventional vehicular lamps, the vehicular lamp 101 shown in FIG. 6 employs a configuration in which an LED substrate 106 is housed in a lamp chamber 104 defined by a body (housing) 102 and a lens 103. However, if the body 102 is omitted and the LED board 106 has the function of the body, and the lamp chamber 104 is formed by the LED board 106 and the lens 103, the number of parts can be reduced, and the structure can be simplified and the cost can be reduced. It is expected to be able to plan. In this case, since a hole for drawing the cords 108, 109, and 110 for supplying power into the lamp chamber 104 cannot be formed in the LED substrate 106, structural contrivance is required.

  By the way, in the vehicular lamp 101 shown in FIG. 6, a configuration in which the LED substrate 106 is accommodated in the lamp chamber 104 defined by the body 102 and the lens 103 is employed. Therefore, the LED 105 mounted on the LED substrate 106 is used. The heat generated is transmitted from the LED board 106 to the air in the lamp chamber 104, transmitted from the air to the body 102, and finally dissipated from the surface of the body 102 to the outside air. However, since the cooling effect of the LED 105 is low, the temperature of the LED 105 is increased, and the light emission efficiency and the durability life of the LED 105 are decreased.

  The present invention has been made in view of the above circumstances, and its objective is to reduce the number of parts to simplify the structure, reduce the size and reduce the cost, and increase the heat dissipation to improve the luminous efficiency and durability of the LED. An object of the present invention is to provide a vehicular lamp that can prevent a reduction in service life.

  In order to achieve the above object, according to the first aspect of the present invention, a lamp chamber is formed by directly fixing a substrate on which an LED is mounted and a lens through which light emitted from the LED is transmitted. A vehicular lamp is constructed by accommodating the LED in a room.

  According to a second aspect of the present invention, in the first aspect of the invention, a grommet holding hole is formed in the lens, the grommet is fitted into the grommet holding hole, fixed and held, and a cord extending from a power source outside the lamp chamber is provided. The grommet is drawn into the lamp chamber and its end is electrically connected to the substrate.

  According to the first aspect of the present invention, since the lamp chamber is formed between the substrate and the lens that are directly fixed without using the housing, the number of parts is reduced and the structure of the vehicular lamp is simplified. And miniaturization and cost reduction. In addition, since the heat generated by the LED mounted on the board is directly radiated from the board to the outside air, the cooling effect of the LED is enhanced and the temperature rise of the LED is suppressed, and the luminous efficiency and durable life of the LED are reduced. Reduction is prevented.

  According to the second aspect of the present invention, the grommet holding hole is formed in the lens which is a resin molded product, and the grommet is fitted and fixed to the grommet holding hole so that the grommet is formed without providing the hole in the substrate. Can be fixed to the lens. Then, the power supply cord is passed through the grommet and pulled into the lamp chamber, and its end is electrically connected to the substrate, whereby the LED mounted on the substrate and the power source are electrically connected by the cord, Power can be supplied to the LED.

1 is a front view of a vehicular lamp according to the present invention. It is a side view (figure of the arrow A direction of FIG. 1) of the vehicle lamp which concerns on this invention. It is a partial front view which shows the attachment state to the vehicle body of the vehicle lamp which concerns on this invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line of FIG. It is a plane sectional view of the vehicular lamp proposed in patent documents 1.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a side view of the vehicular lamp (a view in the direction of arrow A in FIG. 1), and FIG. 4 is a partial front view, FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 5 is a cross-sectional view taken along line CC in FIG.

  A vehicular lamp 1 according to the present embodiment is a tail stop lamp disposed on the left and right of a rear part of an automobile, and is incorporated in a body panel 20 as shown in FIGS. However, since the basic configuration of the pair of left and right vehicle lamps 1 is the same, only one of the vehicle lamps 1 will be shown and described below.

  The vehicular lamp 1 according to the present embodiment is obtained by omitting a conventionally provided housing, and as shown in FIG. 4, two upper and lower LEDs 2 (only one is shown in FIG. 4) as light sources. A lamp chamber 5 is formed between the mounted flat substrate 3 and a transparent lens 4 through which light emitted from the LED 2 is transmitted, and the LED 2 is accommodated in the lamp chamber 5. Configured.

  The substrate 3 is formed in a substantially rectangular flat plate shape, and the two upper and lower LEDs 2 are mounted on a surface facing the lamp chamber 4. As shown in FIG. 4, engagement holes are provided at five locations along the outer peripheral edge of the substrate 3 (locations corresponding to the protrusions 4b (see FIG. 1) formed at five locations along the flange portion 4a of the lens 4). 3a is formed. As shown in FIG. 5, circular screw insertion holes 3 b are formed at two locations on the upper and lower sides of the substrate 3.

  The lens 4 is integrally formed in a substantially rectangular box shape with a transparent resin, and a substantially triangular prism-shaped convex portion 4A that bulges integrally toward the rear of the vehicle (upward in FIG. 4) is formed at the center thereof. A flat step portion 4B, which is lowered by one step, is formed beside the convex portion 4A. As shown in FIGS. 1 and 4, the stepped portion 4B is integrally provided with an elliptical cylindrical boss portion 4C, and an elliptical grommet holding hole 4c is formed inside the boss portion 4C. Is formed.

  As shown in FIGS. 1 and 4, the projections 4 b projecting outward are formed at five locations of the flange 4 a formed along the outer peripheral edge of the lens 4. On the lower surface of 4b, as shown in FIG. 4, hook-like engaging claws 4d that protrude integrally toward the front of the vehicle (downward in FIG. 4) are formed. As shown in FIG. 1, the lens 4 is formed with brackets 4D that integrally project from the upper and lower sides of the flange portion 4a, and each bracket 4D is formed with a circular screw insertion hole 4e. ing. As shown in FIG. 4, a gasket 6 is fitted on the mating surface of the flange portion 4 a of the lens 4 with the substrate 3.

  Further, as shown in FIG. 4, upper and lower light guide portions 4 </ b> E are integrally projected from the inner surface of the convex portion 4 </ b> A formed at the center portion of the lens 3 toward each LED 2, A concave incident surface 4f is formed on the end surface of the portion 4E facing the LED2.

  Thus, the base plate 3 is engaged with the engaging holes 3a formed at the five locations along the outer peripheral edge thereof, as shown in FIG. By doing so, the lens 4 is directly fixed so as to cover the opening, and the lamp chamber 5 is defined by the substrate 3 and the lens 4, and two LEDs 2 are accommodated in the lamp chamber 5.

  Further, as shown in FIG. 4, a grommet 7 formed into an elliptical column shape by an elastic body is fitted and fixedly held in the grommet holding hole 4c formed in the boss portion 4C of the lens 4. Two cords 8 for power supply extending from a power source (not shown) such as a battery provided outside 5 are passed through the grommet 7 and drawn into the lamp chamber 5, and the end portions thereof are connected to the substrate 3 via the connector 9. Is electrically connected. Therefore, the LED 2 mounted on the substrate 3 and the power source are electrically connected via the cord 8, thereby enabling power supply from the power source to the LED 2. In the vehicular lamp 1 according to the present embodiment, the gasket 6 and the grommet 7 ensure high airtightness and waterproofness in the lamp chamber 5.

  The vehicle lamp 1 configured as described above is incorporated into the vehicle body panel 20 as shown in FIGS. 3 to 5, and the vehicle body panel 20 has a convex portion 4 </ b> A of the lens 4 of the vehicle lamp 1. An opening 20a along the outer diameter shape is formed. As shown in FIG. 5, bosses 20A are integrally projected inwardly from two locations on the inner peripheral surface of the opening 20a of the vehicle body panel 20, and each boss 20A has a screw hole 20b. Each is formed.

  Thus, the vehicular lamp 1 is assembled from the inside of the vehicle body panel 20, and the convex portion 4 </ b> A of the lens 4 is fitted into the opening 20 a of the vehicle body panel 20. In this state, the upper and lower brackets 4D of the lens 4 are brought into contact with the end surfaces of the upper and lower bosses 20A of the vehicle body panel 20 as shown in FIG. 5, and screw insertion holes 4e (see FIG. 1) formed in the bracket 4D of the lens 4 and the substrate The vehicle lamp 1 is attached to the vehicle body panel 20 by screwing the upper and lower screws 10 inserted into the screw insertion holes 3b formed above and below the screw holes 20b formed in the bosses 20A of the vehicle body panel 20. From the opening 20a of the vehicle body panel 20, the outer surface of the convex portion 4A that bulges out in the center of the lens 4 of the vehicular lamp 1 is exposed to the outside.

  When the driver of the automobile depresses a brake pedal (not shown), current is supplied from the power source to the two LEDs 2 of the board 3 via the cord 8, and each LED 2 is activated to emit light. Then, the light emitted from each LED 2 enters the light guide portion 4E from the incident surface 4f of the light guide portion 4E of the lens 4 and proceeds to the rear of the vehicle while repeating total reflection inside the light guide portion 4E. 4 irradiates toward the rear of the vehicle, and the vehicular lamp 1 as a tail stop lamp is turned on to make a subsequent vehicle or a pedestrian visually recognize that the vehicle has been braked.

  As described above, in the vehicular lamp 1 according to the present embodiment, the substrate 3 and the lens 4 are directly fixed and the lamp chamber 5 is formed between the two without using the housing. The number of parts is reduced by that amount, so that the structure and size of the vehicular lamp 1 can be simplified and the cost can be reduced. Since the heat generated by the LED 2 mounted on the substrate 3 is directly radiated from the substrate 3 to the outside air, the cooling effect of the LED 2 is enhanced and the temperature rise of the LED 2 is suppressed, and the luminous efficiency and durability of the LED 2 are increased. A reduction in service life is prevented.

  Further, in the vehicular lamp 1 according to the present embodiment, the grommet holding hole 4c is formed in the lens 4 which is a resin molded product, and the grommet 7 is fitted and fixedly held in the grommet holding hole 4c. The grommet 7 can be fixed to the lens 4 without providing a hole in the substrate 3. Then, the power supply cord 8 is drawn into the lamp chamber 5 through the grommet 7, and its end is electrically connected to the substrate 3 via the connector 9, whereby the LED 2 mounted on the substrate 3 and the power supply Can be electrically connected by the cord 8 to enable power supply to the LED 2 from the power source.

  Although the present invention has been described with respect to a form in which the present invention is applied to the tail stop lamps disposed on the left and right of the rear part of the automobile, the present invention is not limited to the tail stop lamp of any other vehicle including a motorcycle other than the automobile. Of course, the present invention can be similarly applied to any other vehicular lamp.

1 Vehicle lamp 2 LED
3 Substrate 4 Lens 4c Lens Grommet and Holding Hole 5 Light Chamber 6 Gasket 7 Grommet 8 Cord 9 Connector 10 Screw

Claims (2)

  A substrate on which an LED is mounted and a lens through which light emitted from the LED is transmitted are directly fixed to form a lamp chamber therebetween, and the LED is accommodated in the lamp chamber. Vehicle lamp. A grommet holding hole is formed in the lens, and the grommet is fitted and fixed in the grommet holding hole, and a cord extending from a power source outside the lamp chamber is passed through the grommet and drawn into the lamp chamber, and an end thereof is the substrate. The vehicular lamp according to claim 1, wherein the vehicular lamp is electrically connected to the vehicular lamp.

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