JP5429862B2 - Vehicle lamp - Google Patents

Description

  The present invention relates to a vehicular lamp. Specifically, the present invention relates to a technical field in which a reflecting member that covers a circuit board is provided to prevent sunlight from entering the circuit board.

  In a vehicle lamp, a lamp unit in which a light emitting diode (LED) is used as a light source is arranged inside a lamp outer casing formed by a lamp body and an outer cover that closes an opening of the lamp body. (For example, refer to Patent Document 1). The light emitting diode is mounted on a circuit board, and a light emitting unit is configured by the light emitting diode and the circuit board.

  Such a lamp unit is constituted by each part or a part thereof such as a light source (light emitting diode), a reflector, a shade, and a projection lens.

  In the vehicular lamp as described above, for example, the light emitted from the light emitting diode is reflected by the reflector toward the projection lens, and is partially transmitted through the projection lens and the outer cover while being shielded by the shade. To the outside.

JP 2007-207527 A

  By the way, there is a possibility that sunlight may enter the vehicular lamp while the vehicle is running or stopped. For example, if the optical axis of the vehicle lamp coincides with the traveling direction of the sun's rays accidentally while traveling or stopped, sunlight is emitted through a path opposite to the path of the light emitted from the light emitting diode. There is a risk of being incident on the circuit board of the unit.

  If sunlight is incident on the circuit board, there is a risk of causing problems such as melting, damage, or destruction of the circuit board.

  In particular, sunlight contains infrared light that has high heat action and has the property of a heat ray. Therefore, the temperature rise of the circuit board due to the incidence of sunlight on the circuit board is suppressed, and the circuit board is melted. It is necessary to prevent this.

  Therefore, an object of the vehicular lamp of the present invention is to prevent sunlight from entering the circuit board.

In order to solve the above-described problem, a vehicular lamp is used as a light source and a lamp outer casing that is configured by a lamp body that is opened on one side and an outer cover that is attached to the lamp body and closes the opening. A light-emitting unit having a light-emitting diode and a circuit board on which the light-emitting diode is mounted, and a reflection member that reflects sunlight that passes through the outer cover and travels toward the light-emitting unit; A reflector having a reflecting surface for reflecting the light emitted from the light emitting diode; and a projection lens for transmitting the light reflected by the reflector and irradiating forward, the focal point of the projection lens being a front focal point of the reflector in conjunction with the match, the rear focus of said reflector is matched to the emission point of the light emitting diode, the reflecting member Therefore in which the light emitting diode of the circuit board is to cover at least a portion of the mounted surface.

  Therefore, in the vehicular lamp, sunlight that is transmitted through the outer cover and directed toward the light emitting unit is reflected by the reflecting member.

  The vehicular lamp according to the present invention includes a lamp outer casing constituted by a lamp body opened on one side and an outer cover attached to the lamp body and closing the opening, a light emitting diode used as a light source, and the light emitting diode A light emitting unit having a circuit board mounted thereon and disposed inside the lamp outer casing, and a reflecting member that reflects sunlight toward the light emitting unit through the outer cover and is reflected by the reflecting member. The circuit board is configured to cover at least a part of a surface on which the light emitting diode is mounted.

  Therefore, when sunlight is incident through the outer cover, the sunlight is reflected by the reflecting member and is prevented from entering the circuit board, thereby preventing the occurrence of problems such as melting, damage, and destruction of the circuit board. can do.

  In the invention described in claim 2, since the irregular reflection part for irregularly reflecting sunlight is formed on the reflection member, the light toward the light emitting unit is irregularly reflected by the reflection member, and thus the light reflected by the reflection member Is difficult to be irradiated as illusion light on oncoming vehicles or the like, and generation of illusion light can be suppressed.

  The best mode for carrying out the vehicular lamp of the present invention will be described below with reference to the accompanying drawings.

  In the best mode shown below, the vehicular lamp of the present invention is applied to a vehicular headlamp. The applicable range of the vehicular lamp of the present invention is not limited to the vehicular headlamp, and the present invention can be applied to various vehicular lamps in which a light emitting diode is used as a light source.

  A vehicular lamp (vehicle headlamp) 1 is mounted and disposed at both left and right ends of a front end portion of a vehicle body.

  As shown in FIG. 1, the vehicular lamp 1 includes, for example, an interior of a lamp outer casing 4 that includes a lamp body 2 that is opened forward and an outer cover 3 that is attached to the front end of the lamp body 2. A lamp chamber 5 is formed, and a lamp unit 6 is arranged in the lamp chamber 5.

  A holding member 7 is disposed in the lamp chamber 5 via an optical axis adjusting mechanism 8 so as to be tiltable in the horizontal direction and the vertical direction.

  The holding member 7 is formed of a metal material having high thermal conductivity, and includes a base portion 9 facing in the front-rear direction and a mounting protrusion 10 protruding forward from a central portion in the vertical direction of the base portion 9. .

  Supported portions 9a, 9a, 9a are provided at both upper and lower ends of the base portion 9 (only two supported portions 9a, 9a are shown in FIG. 1). On the rear surface of the base part 9, heat radiation fins 9b, 9b,...

  A light emitting unit 11 is disposed on the upper surface of the mounting protrusion 10.

  The light emitting unit 11 includes a circuit board 11a, a light emitting diode 11b mounted on the circuit board 11a and functioning as a light source, and a protective cover 11c that closes and protects the light emitting diode 11b.

  A reflector 12 is attached to the rear end portion on the upper surface of the attachment protrusion 10. The inner surface of the reflector 12 is formed as a reflecting surface 12a.

  A connecting member 13 is attached to the front surface of the attachment protrusion 10. The connecting member 13 has a rear half portion provided as a shade 13a and a front half portion provided as a holding protrusion 13b protruding forward from the shade 13a. The front end of the upper surface of the shade 13 a is formed as a light condensing point 13 c of light emitted from the light emitting diode 11 b and reflected by the reflector 12.

  A projection lens 14 is attached to the front end portion of the connecting member 13.

  The focal point of the projection lens 14 is coincident with the condensing point 13c of the shade 13a, and the condensing point 13c is coincident with the front focal point of the reflector 12. The rear focal point of the reflector 12 is coincident with the emission point of the light emitting diode 11b.

  A reflecting member 15 is disposed inside the lamp unit 6 (see FIGS. 1 and 2). The reflecting member 15 has a function of reflecting sunlight incident on the inside of the lamp unit 6 and is formed of a material having heat resistance.

  The reflection member 15 is made of, for example, a plate-like member having a reflection layer formed on the surface of a resin material, a metal plate, or the like, and has an arrangement hole 15a at the center. On the upper surface or the lower surface of the reflecting member 15, a large number of irregularly reflecting portions 15b each having a predetermined fine shape are formed. Therefore, the light incident on the reflecting member 15 is irregularly reflected by the irregular reflection portion 15b.

  The reflection member 15 is disposed in a state where the protective cover 11c is inserted into the disposition hole 15a, and the lower surface is disposed so as to face the upper surface of the circuit board 11a and have a predetermined gap between the circuit board 11a. Therefore, the circuit board 11a is covered with the reflecting member 15 on the upper surface other than the portion where the light emitting diode 11b and the protective cover 11c are arranged.

  In addition, the part covered with the reflection member 15 may be a part of the part instead of all parts other than the part where the light emitting diode 11b and the protective cover 11c are arranged on the upper surface of the circuit board 11a.

  In the vehicle lamp 1, the lamp unit 6 is configured by the light emitting unit 11, the reflector 12, the connecting member 13, the projection lens 14, and the reflecting member 15 described above.

  The optical axis adjusting mechanism 8 includes aiming screws 16 and 16 (only one aiming screw 16 is shown in FIG. 1) and a leveling actuator 17.

  The aiming screws 16 and 16 are spaced apart from each other in the upper and lower parts of the lamp chamber 5 and are composed of rotation operation portions 18 and 18 and shaft portions 19 and 19 protruding forward from the rotation operation portions 18 and 18, respectively. The front end portions of the shaft portions 19 and 19 are provided as screw shaft portions 19a and 19a.

  The aiming screws 16 and 16 are rotatably supported by rotation operation portions 18 and 18 at the rear end portion of the lamp body 2, and screw shaft portions 19 a and 19 a are respectively screwed into supported portions 9 a and 9 a above the holding member 7. Are combined.

  The leveling actuator 17 includes a drive unit 20 and a shaft portion 21 protruding forward from the drive unit 20, and a front end portion of the shaft portion 21 is provided as a screw shaft portion 21a. In the leveling actuator 17, the screw shaft portion 21 a is screwed to the supported portion 9 a on the lower side of the holding member 7.

  In the vehicular lamp 1, when the aiming screw 16 connected to the supported portion 9 a is rotated by the rotation operation portion 18 being operated by a jig such as a driver (not shown), the other object is moved in the direction corresponding to the rotation direction. The holding member 7 is tilted with the support portions 9a and 9a as fulcrums, and the optical axis of the lamp unit 6 is adjusted (aiming adjustment).

  Further, when the shaft portion 21 connected to the supported portion 9a is rotated by the driving force of the driving portion 20, the holding member 7 moves up and down with the other supported portions 9a and 9a as fulcrums in the direction corresponding to the rotation direction. The optical axis of the lamp unit 6 is adjusted (leveling adjustment).

  In the vehicular lamp 1 configured as described above, when light is emitted from the light emitting diode 11 b of the lamp unit 6, the emitted light is reflected by the reflector 12 and transmitted through the projection lens 14 and the outer cover 3. Is irradiated.

  As described above, in the vehicular lamp 1, a portion other than the portion where the light emitting diode 11b and the protective cover 11c are disposed on the upper surface of the circuit board 11a is covered with the reflecting member 15. Therefore, when sunlight is incident through the outer cover 3 and the projection lens 14, the sunlight is reflected by the reflecting member 15 to be prevented from entering the circuit board 11a, and the circuit board 11a is melted, damaged, destroyed, or the like. Can be prevented from occurring.

  Further, since the irregular reflection portion 15b is formed in the reflecting member 15, the light is emitted from each portion of the lamp unit 6 emitted from the light emitting diode 11b, for example, the step surface formed on the reflector 12 or the rear surface of the projection lens 14. Light traveling toward the unit 11 is irregularly reflected by the irregular reflection portion 15b. Therefore, the light reflected from each part of the lamp unit 6 and directed toward the light emitting unit 11 and reflected by the reflecting member 15 is not easily irradiated as the illusion light to the oncoming vehicle or the like, and the generation of the illusion light can be suppressed.

  Furthermore, since the reflecting member 15 is formed of a heat-resistant material, deformation and temperature rise of the reflecting member 15 due to sunlight heat are suppressed, and adverse effects due to sunlight heat on the circuit board 11a can be prevented. it can.

  Hereinafter, a vehicle headlamp that projects a light distribution pattern in a divided manner will be described (see FIGS. 3 and 4).

  As shown in FIG. 3, the vehicular lamp 1A has, for example, two high beam reflectors 12A and 12A for irradiating a long distance adjacent to each other, and light shielding plates 22 and 22 are provided between the reflectors 12A and 12A. The lamp unit 6A is provided. In the lamp unit 6A, light emitting units 11 and 11 are arranged corresponding to the reflectors 12A and 12A, respectively. In the lamp unit 6A, the point 23 where the front end portions of the light shielding plates 22 and 22 are joined is made to coincide with the focal point of the projection lens 14 so that the light distribution pattern is divided and projected.

  In the vehicular lamp 1A having such a lamp unit 6A, the presence / absence of the vehicle in front is detected, and the light emitting diodes 11b and 11b are controlled to be turned on / off according to the detection result. For example, when the presence of a vehicle in front is detected, only one of the light emitting diodes 11b is turned on so as not to irradiate the vehicle in front and its surrounding area, thereby preventing the generation of dazzling light. When the presence is not detected, both the light emitting diodes 11b and 11b are lit to ensure good visibility.

  In the vehicle lamp 1A, since the light shielding plates 22 and 22 are provided, the shadow of the light shielding plates 22 and 22 is projected between the divided light distribution patterns, and a boundary line is generated. Since the vehicular lamp 1A is usually of a type that irradiates a long distance, the boundary line is not conspicuous when irradiating a long distance, and the driver of the vehicle does not feel uncomfortable. When a building or a wall surface is irradiated with light, the boundary line is noticeable and the driver of the vehicle may feel uncomfortable.

  Therefore, in the vehicular lamp 1A, when the traveling speed of the vehicle is below a certain level, the projection lens 14 is moved in the direction of the optical axis P to shift the focal point from the point 23 so that no boundary line is generated. ing. Therefore, when traveling at low speed in an urban area or the like, no boundary line is generated, and the driver of the vehicle does not feel uncomfortable.

  When the projection lens 14 is moved in the direction of the optical axis P, the maximum luminous intensity of the light emitted from the lamp unit 6A is reduced. However, when traveling at a low speed, visibility to a distant place is not required. The decrease in the maximum light intensity will not interfere with the driving of the vehicle.

  In the vehicle lamp 1A described above, the projection lens 14 is moved in the direction of the optical axis P during low-speed traveling and the focus is shifted. Therefore, when sunlight is transmitted through the projection lens 14 during low-speed traveling during the daytime. Sunlight may be incident on a region around the light emitting diode 11 b in the light emitting unit 11.

  Therefore, in order to prevent the sunlight from entering the area around the light emitting diode 11b, it is desirable to arrange the reflecting member 15 described above. As described above, when the projection lens 14 is moved in the direction of the optical axis P by disposing the reflecting member 15 at a position covering the portion of the circuit board 11a other than the portion where the light emitting diode 11b and the protective cover 11c are disposed. Can be prevented from entering the circuit board 11a.

  In addition, as shown in FIG. 4, the vehicular lamp 1B includes, for example, three high beam reflectors 12B, 12B, and 12B that irradiate a long distance, and is disposed between the reflectors 12B, 12B, and 12B, respectively. The lamp unit 6B is provided with the light shielding plates 24, 24. In the lamp unit 6B, light emitting units 11, 11, and 11 are arranged corresponding to the reflectors 12B, 12B, and 12B, respectively. In the lamp unit 6B, the curved surface 25 including the front ends of the light shielding plates 24, 24 is made to coincide with the focal plane of the projection lens 14 so that the light distribution pattern is divided and projected.

  Even in the vehicular lamp 1B having such a lamp unit 6B, the presence / absence of a vehicle in front is detected as in the vehicular lamp 1A, and the light emitting diodes 11b and 11b are turned on / off according to the detection result. Control is performed, generation of dazzling light is prevented, and good visibility is ensured.

  In the vehicular lamp 1B, similarly to the vehicular lamp 1A, the projection lens 14 is moved in the direction of the optical axis P when the traveling speed of the vehicle is below a certain level so that no boundary line is generated.

  Therefore, in the vehicular lamp 1B, it is desirable to dispose the above-described reflecting member 15 in order to prevent the sunlight from entering the area around the light emitting diode 11b. A circuit of sunlight when the projection lens 14 is moved in the direction of the optical axis P by disposing the reflecting member 15 at a position covering a portion of the circuit board 11a other than the portion where the light emitting diode 11b and the protective cover 11c are disposed. Incidence to the substrate 11a can be prevented.

  In the above, as an example of a vehicle headlamp for dividing and projecting a light distribution pattern, the vehicle headlamp 1A having two reflectors 12A and 12A arranged adjacent to each other and the adjacent ones are arranged. Although the example of the vehicle headlamp 1B having three reflectors 12B, 12B, and 12B has been shown, the number of reflectors is not limited to two or three, and may be four or more.

  The shapes and structures of the respective parts shown in the best mode for carrying out the invention described above are merely examples of the embodiments performed in practicing the present invention. The range should not be interpreted in a limited way.

FIG. 2 to FIG. 4 show the best mode of the vehicular lamp according to the present invention, and this figure is a schematic longitudinal sectional view of the vehicular lamp. It is an expanded sectional view showing a light emitting unit and a reflective member. It is a conceptual diagram which shows the vehicle lamp which has a lamp unit with which two reflectors are arrange | positioned adjacently. It is a conceptual diagram which shows the vehicle lamp which has a lamp unit by which the three reflectors are arrange | positioned adjacently.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp, 2 ... Lamp body, 3 ... Outer cover, 4 ... Outer casing, 11 ... Light emitting unit, 11a ... Circuit board, 11b ... Light emitting diode, 12 ... Reflector, 12a ... Reflecting surface, 14 ... Projection lens , 15 ... reflection member, 15b ... irregular reflection portion, 1A ... vehicle lamp, 1B ... vehicle lamp

Claims (2)

A lamp outer casing constituted by a lamp body opened on one side and an outer cover attached to the lamp body and closing the opening;
A light emitting unit used as a light source and a light emitting unit having a circuit board on which the light emitting diode is mounted and disposed inside the lamp casing;
A reflective member that reflects sunlight passing through the outer cover and traveling toward the light emitting unit;
A reflector having a reflecting surface for reflecting light emitted from the light emitting diode;
A projection lens that transmits the light reflected by the reflector and irradiates the light forward;
The focal point of the projection lens is matched with the front focal point of the reflector, and the rear focal point of the reflector is coincident with the emission point of the light emitting diode,
A vehicular lamp, wherein the reflecting member covers at least a part of a surface of the circuit board on which the light emitting diode is mounted. The vehicular lamp according to claim 1, wherein a diffuse reflection part that diffuses sunlight is formed on the reflection member.

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