JP2017081222A - Vehicular head lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular head lamp capable of decreasing a number of components, reducing weight, and saving a cost, by simplifying the structure.SOLUTION: A vehicular head lamp 1 which stores LEDs 20, 21 which are light sources, a substrate 19 mounting the LEDs, and a reflector 17 reflecting light emitted from the LEDs 20, 21 toward a front side of a vehicle, in a lamp chamber 4 defined by a housing 2 and an outer lens 3 covering a front surface opening portion of the housing. In the vehicular head lamp 1, the LEDs 20, 21 and a light-up circuit 22 drive-controlling the LEDs are mounted on the one common substrate 19. For example, the substrate 19 is horizontally disposed on an upper surface of the reflector 17, and on a lower surface of the substrate 17, a plurality of each two of high-beam LEDs 20 and low-beam LEDs 21 is disposed in a width direction so as to make a light emitting direction downward, and on the reflector 17, a plurality of each two of high-beam reflection surfaces 17a and low-beam reflection surfaces 17b is formed in the width direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle headlamp that uses an LED (light emitting diode) as a light source.

  In recent years, LEDs having advantages such as high luminous efficiency, high luminance, and power saving have been used as light sources for headlamps disposed in front of vehicles such as motorcycles. As a headlamp using such an LED as a light source, Patent Documents 1 and 2 propose a headlamp for a motorcycle.

  That is, in Patent Document 1, in a motorcycle headlamp in which a low beam lamp and a high beam lamp are integrated, the low beam LED is arranged on both the left and right sides of the high beam LED and in front of the high beam LED. There has been proposed a configuration in which the reflector for the long beam is made longer in the front-rear direction than the reflector for the low beam, and the front lower end portion of the reflector for the low beam is arranged in front of the reflector for the high beam. According to such a headlamp, the light emission image of the low beam lamp can be emphasized regardless of whether the high beam lamp is turned on, and the light distribution characteristic necessary for the headlamp can be obtained.

  Patent Document 2 discloses a cooling head for a motorcycle headlamp that reflects light emitted from LEDs arranged on the left and right by a reflector and transmits the reflected light to the front of the vehicle through a lens. There has been proposed a configuration in which an inlet portion to be taken in is provided in the reflector, and an outlet portion for discharging cooling air is provided at a location above the inlet portion of the reflector and in the vicinity of the lens. According to such a headlamp, the cooling efficiency can be improved at low cost without using a special device.

Japanese Patent No. 5748902 JP 2014-198547 A

  However, in the motorcycle headlamps proposed in Patent Documents 1 and 2, since a plurality of LED boards for mounting each LED are independently provided, the number of parts increases, the structure becomes complicated and the cost increases. There is a problem of inviting. Moreover, in the conventional headlamps including the motorcycle headlamps proposed in Patent Documents 1 and 2, a control board on which a lighting circuit for driving and controlling each LED is mounted is provided separately from the LED board. In addition, since a heat sink is also provided as a heat dissipation means for cooling the LED that becomes high temperature due to heat generation, there is a problem that an increase in the number of parts and cost, and an increase in weight are caused.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle headlamp capable of simplifying the structure, reducing the number of parts, reducing the weight, and reducing the cost. is there.

  In order to achieve the above object, according to the first aspect of the present invention, an LED, which is a light source, a substrate on which the LED is mounted, and the LED emits light in a lamp chamber defined by a housing and an outer lens covering a front opening of the housing. In a vehicle headlamp that houses a reflector that reflects light toward the front of the vehicle, the LED and a lighting circuit that drives and controls the LED are mounted on a common substrate. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the substrate is horizontally disposed on the upper surface of the reflector, and the light emitting direction of the LED is downward on the lower surface of the substrate. A plurality of reflectors are arranged in the width direction, and a plurality of reflecting surfaces corresponding to the respective LEDs are formed in the width direction on the reflector.

  The invention according to claim 3 is the invention according to claim 2, wherein the plurality of LEDs and the plurality of reflecting surfaces of the reflector corresponding to each LED constitute a low beam lamp and a high beam lamp, respectively. As the lighting circuit, a circuit for driving and controlling the low beam lamp and a circuit for driving and controlling the high beam lamp are provided independently.

  According to a fourth aspect of the present invention, the lighting circuit for driving and controlling the low beam lamp and the lighting circuit for driving and controlling the high beam lamp in the invention of the third aspect are provided on two sides of the left and right ends of the substrate. It is characterized by being arranged at a position facing each other.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the substrate is arranged so as to float from the top surface of the reflector, and light from each LED on the top surface of the reflector is arranged. A light-shielding rib is erected around the light-transmitting hole through which the light passes.

  According to the first aspect of the present invention, since the LED and the lighting circuit, which are conventionally mounted on separate substrates, are mounted on one common substrate, the number of components is reduced, and the structure is simplified and the cost is reduced. Down and weight reduction can be achieved. In addition, if the amount of heat generated by each LED can be kept low by flowing a current low enough to satisfy the standard applied to the vehicle headlamp to each LED, a heat sink that has been conventionally required Can be omitted, and the number of parts can be further reduced, the structure can be simplified, the cost can be reduced, and the weight can be reduced. Furthermore, by adopting a single common substrate, the substrate size can be increased, thereby enhancing the heat dissipation effect due to the contribution of the substrate.

  According to the second and third aspects of the invention, the high beam LED and the high beam lamp including the reflecting surface of the reflector corresponding thereto, the low beam LED and the low beam lamp including the reflecting surface of the reflector corresponding thereto, and Are arranged in the width direction, and lighting of these high beam lamps and low beam lamps can be individually controlled by a lighting circuit to switch the light distribution of the vehicle lamp to a high beam or a low beam.

  According to the fourth aspect of the present invention, the lighting circuit for driving and controlling the low beam lamp and the lighting circuit for driving and controlling the high beam lamp are faced to the two sides at the left and right ends apart from the LED which is the heat source of the substrate. Since each lighting circuit is disposed at each position, it is possible to suppress the thermal influence that each lighting circuit receives from the LED, and it is possible to increase the heat dissipation of each lighting circuit and suppress the temperature rise thereof.

  According to the invention described in claim 5, since the substrate is arranged so as to float from the top surface of the reflector, the heat dissipation property of the substrate can be improved. In addition, since the light shielding rib is erected around the light transmitting hole through which light from each LED on the top surface of the reflector passes, light leakage from each light transmitting hole is suppressed and the light utilization efficiency is reduced. Is increased.

1 is a front view of a vehicle headlamp according to the present invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a perspective view of the reflector of the vehicle headlamp which concerns on this invention. It is a front view of the board | substrate which mounted the electronic component of the vehicle headlamp which concerns on this invention. It is a back view of the board | substrate which mounted the electronic component of the vehicle headlamp which concerns on this invention. It is a perspective view of a reflector in the state where a substrate of a vehicular lamp concerning the present invention was attached.

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

  1 is a front view of a vehicle headlamp according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 5 is a sectional view taken along the line D-D of FIG. 1, FIG. 6 is a perspective view of a reflector for a vehicle headlamp according to the present invention, and FIG. 7 is an electronic component of the vehicle headlamp. FIG. 8 is a front view of the board, and FIG. 9 is a perspective view of the reflector with the board of the vehicle lamp according to the present invention attached thereto.

  A vehicle headlamp 1 according to the present embodiment is a combination-type lamp disposed at the front of a motorcycle, and covers the housing 2 and its front opening as shown in FIGS. A lamp chamber 4 defined by the outer lens 3 accommodates a pair of left and right high beam lamps 5 and low beam lamps 6, left and right turn signal lamps 7 and a position lamp 8 as a plurality of lamp units having different functions. (See FIG. 1). Note that the left side of FIGS.

  As shown in FIG. 1, the pair of left and right high beam lamps 5 are arranged inside the lamp chamber 4 in the width direction, and the left and right low beam lamps 6 are arranged outside them. The turn signal lamps 7 are respectively disposed on the left and right ends above the left and right low beam lamps 6 in the lamp chamber 4, and each turn signal lamp 7 includes a bulb (bulb) 9 as a light source. Yes. Further, the position lamps 8 are respectively disposed on the left and right sides of the lower part of the lamp chamber 4, and each of the position lamps 8 has two LEDs 11 mounted on the left and right sides of the substrate 10 (see FIGS. 2 and 9). (Refer to FIG. 9) and a rod-shaped light guide body 12 (see FIGS. 3 and 5) that emits light by light incident from each LED 11.

  By the way, the housing 2 is integrally formed of opaque resin that does not transmit light. As shown in FIG. 1, four brackets 13 are provided on the outer periphery of the upper portion, and one bracket 14 is provided on the lower both sides. Projected integrally. Further, a fitting groove 2 a that opens forward is formed on the outer peripheral edge of the housing 2 over the entire circumference. The vehicular lamp 1 is attached to a vehicle body (not shown) by screws 15 (see FIGS. 3 and 4) inserted through the brackets 13 and 14, respectively.

  The outer lens 3 is integrally formed of a transparent resin that allows light to pass through, and a rib-like leg portion 3a is integrally protruded rearward at the outer peripheral edge thereof. The outer lens 3 has a peripheral edge of the housing 2 by fitting the leg 3a projecting on the outer peripheral edge of the outer lens 3 into the fitting groove 2a of the housing 2 from the front and bonding them together with an adhesive 16 such as hot melt. The lamp chamber 4 is defined by the outer lens 3 and the housing 2.

  Here, the details of the configuration of the pair of left and right high beam lamps 5 and the low beam lamp 6 will be described.

  As shown in FIGS. 2 to 5, the reflector 17 shown in FIG. 6 and an extension 18 covering the periphery thereof are accommodated in the lamp chamber 4. The reflector 17 and the extension 18 are integrally formed of an opaque resin that does not transmit light.

  As shown in FIG. 6, the reflector 17 has a flat and horizontal top surface 17A, and a pair of left and right high beam reflecting surfaces 17a on the inner sides of both sides of a concave portion 17B formed at the center in the width direction. On the outside, a pair of left and right low beam reflecting surfaces 17b are formed. The high beam reflection surface 17a and the low beam reflection surface 17b form a concave curved surface that curves downward from the top surface 17A toward the front of the vehicle, and the surface is subjected to a reflection process such as aluminum vapor deposition. ing.

  Further, as shown in FIG. 6, light transmitting holes 17 c that transmit light are respectively laterally arranged above the pair of left and right high beam reflecting surfaces 17 a and low beam reflecting surfaces 17 b of the top surface 17 </ b> A of the reflector 17. It is formed at an appropriate interval. And the screw boss | hub 17d is integrally projected by three places of the width direction center part of the top surface 17A of this reflector 17, and both right-and-left both ends. In addition, boss-shaped receiving portions 17e are integrally erected at two places on the left and right of the center portion of the top surface 17A of the reflector 17, and at two places on the left and right ends (two places where the screw bosses 17d are provided) Positioning pins 17f and 17g having different shapes are erected integrally. As shown in FIGS. 3 and 6, light shielding ribs 17 h are integrally provided around each light transmitting hole 17 c on the top surface 17 </ b> A of the reflector 17.

  Thus, the single substrate 19 shown in FIGS. 7 and 8 is horizontally mounted and fixed on the top surface 17A of the reflector 17, and two inner sides (the back surface) of the substrate 19 ( High beam LEDs 20 are mounted at two locations corresponding to the high beam reflecting surface 17a, and low beam LEDs 21 are mounted at the two outer left and right ends (two locations corresponding to the low beam reflecting surface 17b). (See FIG. 8). In addition, lighting circuits 22 for independently controlling the driving of the high beam LED 20 and the low beam LED 21 are mounted on both the left and right ends of the lower surface (back surface) of the substrate 19 and facing the two sides. Yes. Each lighting circuit 22 includes an electronic component such as a DC-DC converter.

  Furthermore, as shown in FIG. 8, circular holes are inserted into the center 19 of the substrate 19 and the left and right ends (three locations corresponding to the screw bosses 17d erected on the top surface 17A of the reflector 17). Holes 19a are respectively formed at two left and right end portions (two locations corresponding to the positioning pins 17f and 17g provided upright on the top surface 17A of the reflector 17) and a circular positioning hole 19b. A hole-shaped positioning hole 19c is formed.

  As described above, the single substrate 19 on which the two high beam LEDs 20, the low beam LED 21, and the lighting circuit 22 are mounted is horizontally placed on the top surface 17A of the reflector 17, as shown in FIG. Fixed. Specifically, the substrate 19 is horizontally supported and mounted by two screw bosses 17d and receiving portions 17e. At this time, the positioning holes 19b and 19c formed in the left and right ends of the substrate 19 are placed. The positioning pins 17f and 17g provided upright on both the left and right ends of the top surface 17A of the reflector 17 are inserted and fitted, whereby the substrate 19 is accurately positioned with respect to the reflector 17. Thus, when the board | substrate 19 is correctly positioned with respect to the reflector 17, the screw insertion hole 19a formed in three places of the width direction center of this board | substrate 19 and both right-and-left both ends is three places on the top | upper surface 17A of the reflector 17. The two high-beam LEDs 20 and the low-beam LEDs 21 mounted on the bottom surface of the substrate 19 are aligned with the screw bosses 17d erected on the top surface 17A of the reflector 17 in total. It is located above. Each of the two high beam LEDs 20 and the low beam LED 21 is mounted on the lower surface of the substrate 19 so that the light emission direction is downward.

  As described above, when the substrate 19 is positioned on the top surface 17A of the reflector 17 and placed horizontally, the screw insertion holes 19a formed at a total of three locations, that is, the central portion of the substrate 19 in the width direction and the left and right ends. The board 19 is fixed to the reflector 17 by screwing screws 23 (see FIG. 2 and FIG. 5) inserted into the screw bosses 17 d erected at three places on the top surface 17 A of the reflector 17. In a state, as shown in FIGS. 2, 3 and 5, a predetermined gap δ is formed between the substrate 19 and the top surface 17 </ b> A of the reflector 17. It is fixed horizontally in a state where it floats from the surface 17A by a gap δ.

  Thus, as shown in FIG. 1, a pair of left and right high beam lamps 5 arranged at two locations inside the lamp chamber 4 of the vehicular lamp 1 are respectively provided with a high beam LED 20 mounted on a substrate 19. And the high-beam reflecting surface 17a formed inside the reflector 17 in the width direction. Further, a pair of left and right low beam lamps 6 arranged at two locations outside the high beam lamp 5 in the lamp chamber 4 of the vehicle lamp 1 are arranged in the width direction of the low beam LEDs 21 and the reflector 17 mounted on the substrate 10. Each low-beam reflecting surface 17b formed outside is configured.

  By the way, the optical axes of the two inner high beam lamps 5 and the two outer low beam lamps 6 are adjusted by an aiming mechanism disposed at the center in the width direction of the vehicular lamp 1. That is, the reflector 17 and the substrate 19 fixed thereto are supported by a pair of left and right pivots 24 shown in FIG. 6 so as to be swingable up and down, and the aiming mechanism has a width of the housing 2 as shown in FIG. The adjusting bolt 25 that is horizontally inserted and supported at the center in the direction is screwed and inserted into a nut 26 that is fixed at the center in the width direction of the reflector 17.

  Therefore, when the adjustment bolt 25 is turned from the back side of the housing 2, the reflector 17 to which the nut 26 screwed to the adjustment bolt 25 is fixed swings up and down around the left and right pivots 24 together with the board 19, so that the inner side The vertical optical axis adjustment of the two high beam lamps 5 and the two outer low beam lamps 6 is performed.

  Thus, in the vehicular lamp 1 configured as described above, each of the two high beam LEDs 20 and the low beam for the substrate 19 from a power source (not shown) such as a battery through the connector 27 and the plurality of cords 28 shown in FIG. When current is supplied to the LEDs 21, the LEDs 20 and 21 are activated to emit light.

  By the way, the lighting circuit 22 mounted on the board 19 individually drives and controls the high beam LED 20 and the low beam LED 21 as described above. However, when the low beam light distribution is formed according to the traveling state of the vehicle, the low beam LED is used. The LED 21 is driven. Then, the light emitted downward from each low beam LED 21 passes through a light transmitting hole 17c formed in the top surface 17A of the reflector 17 and is reflected by the left and right low beam reflecting surfaces 17b of the reflector 17 to the front of the vehicle. The light beam is transmitted through the transparent outer lens 3 and irradiated toward the front of the vehicle to form a low beam light distribution.

  When forming a high beam light distribution, the high beam LED 20 and the low beam LED 21 are driven simultaneously. Then, the light emitted downward from each high beam LED 20 and each low beam LED 21 passes through each light transmitting hole 17 c formed in the top surface 17 A of the reflector 17, and reflects each high beam on the left and right inner sides of the reflector 17. The light is reflected by the surface 17a and the low-beam reflecting surfaces 17b on the left and right outer sides, travels forward in the vehicle, passes through the transparent outer lens 3, and is irradiated forward in the vehicle to form a high beam light distribution.

  As described above, in the vehicular lamp 1 according to the present embodiment, the high beam LED 20, the low beam LED 21, and the lighting circuit 22, which are conventionally mounted on separate substrates, are formed on one common substrate 19. Since it is mounted, the number of parts can be reduced, and the structure can be simplified, the cost can be reduced, and the weight can be reduced. In addition, the amount of heat generated by each LED 20, 21 can be reduced by flowing a low current to each LED 20, 21 that can satisfy a standard (for example, JIS standard) applied to the vehicle headlamp 1. Since it can be kept low, the heat sink that has been necessary in the past can be omitted, and the number of parts can be further reduced, the structure can be simplified, the cost can be reduced, and the weight can be reduced.

  Further, in the vehicular lamp 1 according to the present embodiment, the high beam lamp 20 including the high beam LED 20 and the reflection surface 17a of the reflector 17 corresponding thereto, the low beam LED 21 and the reflection surface of the reflector 17 corresponding thereto. Since a total of four low beam lamps 6 including 17b are arranged in the width direction, and lighting of these high beam lamps 5 and low beam lamps 6 is individually controlled by the lighting circuit 22, the vehicle lamp 1 Can be switched to a high beam or a low beam.

  Further, in the vehicular lamp 1 according to the present embodiment, the substrate 19 is installed with the gap δ floating above the top surface 17A of the reflector 17, and the high beam lamp 5 and the low beam lamp 6 are individually and individually provided. Since the lighting circuit 22 that controls the driving of the lighting circuit 22 is disposed at positions facing the two sides of the left and right ends away from the LEDs 20 and 21 that are the heat sources of the substrate 19, each lighting circuit 22 is suppressed from the thermal influence received from the LEDs 20 and 21. It is possible to increase the heat dissipation of each lighting circuit 22 and suppress the temperature rise thereof.

  In addition, in the vehicular lamp 1 according to the present embodiment, since the substrate 19 is arranged so as to float from the top surface 17A of the reflector 17, the heat dissipation of the substrate 19 is improved. Further, since the light shielding rib 17h is erected around the light transmitting hole 17c through which the light from each LED 20, 21 of the top surface 17A of the reflector 17 passes (see FIG. 3), each light transmitted from each LED 20, 21 is transmitted. The effect that the leakage from the light hole 17c is suppressed and the light use efficiency is enhanced is also obtained. Further, since the rib 17h is provided between the LED 20 and the lighting circuit 22 as a boundary, the heat generated in each LED 20 and the lighting circuit 22 can be reduced. can do.

  Although the present invention has been described with respect to a form in which the present invention is applied to a headlight for a motorcycle, the present invention can be similarly applied to headlights arranged on the left and right sides of a front portion of an automobile. Of course there is.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 3 Outer lens 4 Lamp chamber 5 High beam lamp 6 Low beam lamp 7 Turn signal lamp 8 Position lamp 9 Bulb 10 Substrate 11 LED
DESCRIPTION OF SYMBOLS 12 Light guide 17 Reflector 17A Reflector top surface 17a Reflector for high beam of reflector 17b Reflector for low beam of reflector 17c Translucent hole of reflector 17h Light shield rib of reflector 18 Extension 19 Substrate 20 High beam LED
21 Low beam LED
22 Lighting circuit δ Clearance between the substrate and the top of the reflector

Claims (5)

A vehicle in which an LED as a light source, a substrate on which the LED is mounted, and a reflector that reflects light emitted from the LED toward the front of the vehicle are housed in a lamp chamber defined by an outer lens that covers the housing and its front opening. For headlamps,
A vehicular headlamp characterized in that the LED and a lighting circuit for driving and controlling the LED are mounted on one common board.   The substrate is horizontally arranged on the upper surface of the reflector, and a plurality of LEDs are arranged on the lower surface of the substrate in the width direction so that the light emitting direction is downward, and the reflector has a reflection corresponding to each LED. The vehicle headlamp according to claim 1, wherein a plurality of surfaces are formed in the width direction.   The plurality of LEDs and the plurality of reflecting surfaces of the reflector corresponding to each LED constitute a low beam lamp and a high beam lamp, respectively, and the driving circuit controls the low beam lamp as the lighting circuit, and the high beam lamp. The vehicle headlamp according to claim 2, wherein each of the lamps is independently provided for driving and controlling the lamp.   The lighting circuit for driving and controlling the low beam lamp and the lighting circuit for driving and controlling the high beam lamp are respectively arranged at positions facing two sides of the left and right ends of the substrate. Vehicle headlamps. 3. The substrate is arranged so as to float from the top surface of the reflector, and a light-shielding rib is erected around a translucent hole through which light from each LED on the top surface of the reflector passes. The vehicle headlamp according to any one of?

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