JP2006117164A - Vehicle headlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce weight load to a luminous intensity distribution control means for following/varying an irradiation direction and an irradiation range of a headlight in response to the traveling circumstance. <P>SOLUTION: In the vehicle headlight, a projector type headlight unit 10 is constituted by LED 1, as a light source, fixed to a fixed bracket 15 in a lamp housing while opposing a light-emission part 1a to a reflector 2; a unit casing 9 made of resin, provided with the reflector 2 at a rear part, horizontally turnably mounted to the fixed bracket 15 around the opposed part c1 of the light-emission part 1a and turning-controlled by the luminous intensity distribution control means 20; and a convex lens 3 made of resin and mounted to a front opening of the unit casing 9. The weight load to the luminous intensity distribution control means 20 can be reduced by the fact that the bodies 3, 9 to be controlled are made of resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle headlamp that uses an LED (light emitting diode) as a light source, and more particularly, a light distribution control means that changes the irradiation direction and irradiation range of the headlamp in accordance with a traveling situation, for example, an adaptive lighting system. The present invention relates to a vehicle headlamp equipped with (AFS (Adaptive Front-lighting System)).

  FIG. 8 shows this type of vehicle headlamp 100 (see, for example, Patent Document 1). The vehicle headlamp 100 is irradiated with a projector-type headlamp unit 50 that reflects the light from the light source 1 with the reflector 2 and then emits the light forward through the convex lens 3 in accordance with the traveling state of the vehicle. A light distribution control means (AFS) 51 for following and changing the direction and irradiation range is rotationally controlled in the horizontal direction and is incorporated in the lamp housing 60 to be generally configured.

  In this light distribution control means, information indicating the traveling state of the vehicle is detected by a sensor, and the detection output is output to the electronic control unit 56. The sensors at this time include, for example, a steering sensor that detects the steering angle of the steering wheel, a vehicle speed sensor that detects the vehicle speed of the host vehicle, and each of the front and rear axles to detect the horizontal state (leveling) of the host vehicle. The vehicle height sensor detects the height, and each of these sensors is connected to the electronic control unit 56. The electronic control unit 56 is mounted on the left and right sides of the front part of the vehicle based on the output of the input sensor, and can change the light distribution characteristics by controlling the deflection of the irradiation direction in the left and right directions. The lighting unit 50 is controlled. For this reason, the light distribution control means includes an electronic control unit 56 and a drive means (actuator) 57 having a drive force source such as a drive motor that rotates the headlamp unit 50 in the horizontal direction. Yes. In FIG. 8, reference numeral 58 denotes a connector that connects the electronic control unit 56 and the actuator 57.

  The headlamp unit 50 is formed by being surrounded by a lamp housing 60, an outer lens 52 attached to the front opening of the lamp housing 60, and a rear cover 53 attached to the rear opening of the lamp housing 60. 54.

  The headlamp unit 50 uses a discharge bulb as the light source 1 and is sandwiched between a lower plate 55 a and an upper plate 55 b of a substantially U-shaped bracket 55 fixed in the lamp chamber 54. It is supported. An actuator 57 is fixed to the lower side of the lower plate 55a, and the rotation output shaft 57a of the actuator 57 protrudes upward through a hole in the lower plate 55a. In the headlamp unit 50, the shaft portion 59 provided on the upper surface thereof is fitted to the bearing 61 provided on the upper plate 55b, and the connecting portion 62 provided on the lower surface thereof is fitted to the rotation output shaft 57a of the actuator 57. It is connected by combining.

As a result, the headlamp unit 50 can be rotated in the left-right direction with respect to the bracket 55, and can be rotated in the horizontal direction integrally with the rotation output shaft 57a by the operation of the actuator 57.
JP 2004-98551 A

  However, the vehicular headlamp 100 has a problem that the load on the actuator 57 increases due to the high weight of the projector-type headlamp unit 50, and the light distribution control means 51 is likely to fail. ing.

  That is, since the headlamp unit 50 uses a discharge bulb as the light source 1, the convex lens 3 must be formed of glass in order to withstand the high thermal energy of the light emitted from the light source 1, thereby increasing the unit weight. Is invited.

  Therefore, the present invention aims to improve the durability of the light distribution control means by reducing the weight load on the light distribution control means that changes the irradiation direction and the irradiation range of the headlamps in accordance with the traveling situation. An object of the present invention is to provide a vehicle headlamp that can be used.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a projector type headlamp unit that reflects light from a light source by a reflector and then emits the light forward through a convex lens in accordance with a traveling situation. A vehicle headlamp that is pivotally controlled in a horizontal direction by a light distribution control means for following and changing the direction and irradiation range, and is incorporated in a lamp housing,
The projector-type headlamp unit includes an LED as the light source that is fixed to a fixed bracket in the lamp housing with a light-emitting portion facing the reflector, and a rear portion that includes the reflector and rotates the portion facing the light-emitting portion. A resin unit casing that is pivotally attached to the fixed bracket as a moving center in a horizontal direction and controlled to rotate by the light distribution control means, and the resin unit casing that is attached to a front opening of the unit casing. It is characterized by comprising a convex lens.

  Therefore, in the first aspect of the invention, the light from the LED is emitted toward the reflector, reflected by the reflector, reaches the convex lens, projects an appropriate light distribution pattern forward through the convex lens, and distributes the light. The light distribution pattern can be varied in the left or right direction by the rotation of the unit casing by the control means. At this time, the rotation of the unit casing is centered on the portion facing the light emitting portion of the LED, so that the incident state of the LED light on the reflector can be kept unchanged in spite of the rotation. The pattern shape of the light distribution pattern can also be kept unchanged.

  In addition, since the LED applied as the light source is small in size, it can save the space required for mounting, and the thermal energy of the emitted light is smaller than that of the light source with filament, and the lamp room is excessively heated. Therefore, both the convex lens and the unit casing can be made of resin.

  Further, the light distribution control means controls the rotation of the resin unit casing provided with the resin convex lens other than the LED, so that the weight load during the rotation can be reduced by reducing the weight of the controlled body. Can do.

  Further, since the LED is fixed to the fixed bracket, the heat of the LED is radiated to the outside through the fixed bracket.

The invention according to claim 2 is the vehicle headlamp according to claim 1,
The fixing bracket has a bearing portion drilled at a portion corresponding to the light emission center of the light emitting portion,
The unit casing has a shaft portion provided at a portion corresponding to the light emission center of the light emitting portion supported by the bearing portion, and the other portion is supported and attached to an actuator constituting the light distribution control means. It is characterized by that.

  For this reason, in the second aspect of the invention, the unit casing is rotated about the opposite part of the light emission center of the LED light emitting unit by the operation of the actuator constituting the light distribution control means. For this reason, there is no relative focus shift between the casing and the LED regardless of the rotation of the unit casing, thereby eliminating the distortion of the light distribution pattern when the light distribution is variable.

The invention according to claim 3 is the vehicle headlamp according to claim 1 or 2,
The fixing bracket is provided with heat radiating means.

  For this reason, in the invention described in claim 3, since the heat radiating means is provided on the fixed bracket, the weight reduction of the unit casing provided with the convex lens can be maintained as it is.

  Further, since the heat radiating means is provided on the fixed bracket, there is no rotation after installation, and it is not necessary to secure a space required for the rotation.

  Further, the size of the heat dissipation means can be freely designed according to the size of the fixed bracket.

Moreover, invention of Claim 4 is a vehicle headlamp of any one of Claims 1-3,
A plurality of the LEDs are provided,
A plurality of unit casings having the convex lenses are provided corresponding to each of the plurality of LEDs, and supported by an actuator constituting the light distribution control means so that the whole of the plurality of units is synchronized. It is characterized by being.

  Therefore, in the invention described in claim 4, the plurality of unit casings and the plurality of LEDs provided with the convex lenses generally exhibit a desired light distribution pattern, and the plurality of unit casings provided with the convex lenses are provided with the light distribution. The light distribution pattern can be varied in the left or right direction by rotating in synchronization with the operation of the actuator constituting the control means.

  Moreover, the light distribution pattern at this time can obtain sufficient illuminance by a plurality of LEDs.

  According to the first aspect of the present invention, it is possible to keep the incident state of the light of the LED on the reflector in spite of the rotation of the unit casing, and to keep the pattern shape of the light distribution pattern unchanged. Because it can, it has excellent follow-up performance corresponding to the driving situation.

  According to the first aspect of the present invention, the light distribution control means controls the rotation of only the resin unit casing provided with the resin convex lens. Thus, the durability of the light distribution control means can be improved.

  Moreover, according to the first aspect of the present invention, the thermal energy of the emitted light of the LED is smaller than that of the light source with the filament, and the heat of the LED is radiated to the outside through the fixing bracket. Temperature rise can be suppressed.

  According to the second aspect of the present invention, there is no relative defocus between the casing and the LED regardless of the rotation of the unit casing, thereby eliminating the distortion of the light distribution pattern when the light distribution is variable. Therefore, in addition to the effect of the invention of claim 1, it has a more excellent follow-up performance.

  Further, according to the invention described in claim 3, the weight reduction of the unit casing including the convex lens as the controlled body of the light distribution control means can be maintained despite the provision of the heat dissipation means. In addition to the effect of the invention described in item 1 or 2, the heat of the LED can be more effectively radiated to the outside through the heat radiating means while maintaining the durability of the light distribution control means.

  According to the invention described in claim 3, since the heat dissipating means is fixedly provided on the fixing bracket, a space for rotating the heat dissipating means is unnecessary, and the entire lamp can be configured compactly.

  According to the invention of claim 4, since a light distribution pattern having sufficient illuminance can be produced by a plurality of LEDs, in addition to the effect of the invention of any one of claims 1 to 3. Thus, the compatibility as a vehicle headlamp can be further increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that components having the same functions as those disclosed in FIG.

  1 and 2 show a projector-type headlamp unit 10 applied to a vehicle headlamp as a first embodiment of the present invention. This unit 10 is a projector type in which the light of the LED 1 as a light source is reflected by the reflector 2 and then emitted forward through the convex lens 3, and the light distribution that changes the irradiation direction and the irradiation range in accordance with the traveling situation. The vehicle headlight is configured by being controlled to rotate in the horizontal direction by the control means and incorporated in a lamp housing (not shown).

  As shown in FIGS. 3 to 5, the unit 10 has the LED 1 (see FIG. 3) fixed to the fixing bracket 15 in the lamp housing with the light emitting portion 1 a facing the reflector 2, and the reflector 2 at the rear to emit light. It is attached to the fixed bracket 15 so as to be rotatable in the horizontal direction (a direction or b direction in FIG. 4) with the opposed part c1 (see FIGS. 1B and 2) of the part 1a as a rotation center and light distribution control. A resin-made unit casing 9 that is rotationally controlled by means 20 and a resin-made convex lens 3 that is attached to the front opening of the unit casing 9 are configured. In FIG. 4, the reflector 2 is shown with a half on one side cut out.

  In the present embodiment, as shown in FIG. 3, the fixing bracket 15 has a substantially U-shaped lower frame member 16 opened upward, and a flat plate shape attached to the lower frame member 16 so as to close the open portion. An upper frame member 17 is included.

  The LED 1 is fixed to the mounting plate 14 and is sub-assembled. The LED 1 is fixed to the fixing bracket 15 by connecting the mounting plate 14 to the bottom side 16a of the lower frame member 16 with screws or the like with the light emitting portion 1a facing upward. ing.

  The unit casing 9 includes an upper casing 11 and a lower casing 12 that are divided into upper and lower portions with a horizontal plane including the optical axis Z of the convex lens 3 as a boundary surface.

  At this time, the upper casing 11 is provided on the upper side of the rear part of the optical axis Z of the convex lens 3 and is formed on the inner side by opening the front and lower parts as a free-form surface based on a spheroidal curved surface or a rotational ellipse, The upper lens holder 7 having a substantially semicircular cross-section with a lower opening and extending to the front opening of the reflector 2 is formed integrally with a resin material. The front end of the upper lens holder 7 is formed in a semicircular shape along the outer periphery of the convex lens 3, and an upper engagement groove 7a is formed along the inner surface of the semicircular shape at the front end.

  The lower casing 12 includes a shade 4 having a reflector function extending from a front edge portion 4a formed along the meridional image plane to the rear side along a horizontal plane including the optical axis Z of the convex lens 3, and a front end. The lower lens holder 8 having a substantially semicircular cross section with an open upper portion extended to the edge portion 4a is formed integrally with a resin material. The front end of the lower lens holder 8 is formed in a semicircular shape along the outer periphery of the convex lens 3, and a lower engaging groove 8a is formed along the inner surface of the semicircular shape at the front end.

  Specifically, the upper and lower casings 11 and 12 are integrally formed using, for example, a thermoplastic resin material such as polycarbonate resin or acrylic resin, and the entire surface is subjected to a coating or vapor deposition having a reflection function on the inner surface. It is configured. As described above, the upper and lower casings 11 and 12 are integrally formed with the reflector 2 and the shade 4 as components, respectively, so that the number of parts is reduced and the optical positional accuracy between these parts is improved. be able to.

  Moreover, the convex lens 3 is formed in the biconvex aspherical shape which provided the thin flange part 3a in the outer periphery using transparent thermoplastic resin materials, such as an acrylic resin.

  The convex lens 3 has its flange portion 3a engaged with the upper and lower engaging grooves 7a and 8a, and the upper and lower casings 11 and 12 are connected to each other by using a connecting means such as a screw. It is attached to the unit. In this attached state, the convex lens 3 is arranged with its lens focal point RF substantially matched with the second focal point F2 of the reflector 2, and the central portion of the front edge portion 4a is substantially aligned with the second focal point F2 of the reflector 2. I'm doing it. As a result, it is possible to improve the optical positional accuracy between the convex lens 3 and the aforementioned components.

  The light distribution control means 20 is composed of an electronic control unit (not shown) and an actuator 21 driven by an output from the electronic control unit, as in the conventional case. In that case, the electronic control unit is configured in the same manner as the conventional electronic control unit 56.

  In the present embodiment, as shown in FIG. 4, the actuator 21 includes a motor 22 that is driven by the output from the electronic control unit, a drive unit 23 that is coupled to the motor 22 via the gear meshing portion 18, and a drive unit 23. And a movable arm 24 connected to the drive unit 23 via a lever 19 attached so as to rotate integrally with the shaft 23a. The movable arm 24 is connected to the lever 19 by inserting a shaft 19a fixed to the tip of the lever 19 through the hole of the movable arm 24 and freely connecting it using a washer or a push nut. .

  As shown in FIG. 3, the actuator 21 fixes the drive unit 23 to the bottom side portion 16 a of the lower frame member 16 and fixes the motor 22 to the side side portion 16 b of the lower frame member 16. It is set.

  And the unit casing 9 provided with the convex lens 3 is rotatably attached to the upper frame member 17 of the fixed bracket 15 so that the facing portion c1 of the light emitting portion 1a of the LED 1 is the center of rotation. In this attached state, the light emitting portion 1a of the LED 1 fixed to the lower frame member 16 substantially coincides with the first focal point F1 of the reflector 2 (see FIG. 1B). In FIG. 1B, the light emission pattern L0 of the LED 1 is indicated by a broken line, and the incident state of the light of the LED 1 on the reflector 2 is shown.

  Further, as shown in FIG. 4, the unit casing 9 provided with the convex lens 3 can freely rotate a rear part c2 of the unit casing 9 along the optical axis Z of the convex lens 3 to the movable arm 24 rather than the facing part c1. By being connected, the actuator 21 of the light distribution control means 20 set on the fixed bracket 15 is connected.

  The unit casing 9 having the convex lens 3 attached in this way constitutes a projector-type headlamp unit 10 together with the LED 1 fixed to the fixed bracket 15, and the unit 10 corresponds to the traveling situation. The light distribution control means 20 that changes the irradiation direction and the irradiation range is controlled to rotate in the horizontal direction and incorporated in a lamp housing (not shown) to constitute a vehicle headlamp.

  In the vehicle headlamp configured as described above, the light L of the LED 1 is emitted toward the reflector 2, is reflected by the reflector 2, reaches the convex lens 3, and appropriately distributes light forward through the convex lens 3. While projecting a pattern, the light distribution pattern can be varied in the left or right direction by rotating the unit casing 9 by the light distribution control means 20. At this time, the rotation of the unit casing 9 is centered on the facing portion c1 of the light emitting portion 1a of the LED 1, so that the light L of the LED 1 is incident on the reflector 2 regardless of the rotation (FIG. 1 ( In (b), L0) can be kept unchanged, and the pattern shape of the light distribution pattern can also be kept unchanged.

  The light distribution control at this time is performed by driving the actuator 21 with the output from the electronic control unit constituting the light distribution control means 20. That is, the motor 22 is driven by the output from the electronic control unit, and this driving force is transmitted to the drive unit 23 via the gear meshing portion 18. By this transmission, the shaft 23a and the lever 19 of the drive unit 23 are integrally rotated, and the movable arm 24 is moved in the arrow c direction (see FIG. 4) via the shaft 19a. The movement of the movable arm 24 is transmitted to the unit casing 9 via the rear part c2, and the unit casing 9 having the convex lens 3 is in the direction of the arrow a or b with the opposite part c1 of the light emitting part 1a of the LED 1 as the rotation center ( (See FIG. 4).

  FIG. 6 shows a light distribution pattern obtained at this time. The light distribution pattern P0 (FIG. 6A) is a pattern in which the convex lens 3 is located in front, and the light distribution pattern P0 is a pattern in which the bending point A of the cut line CL is located at the center of the screen. P1 (FIG. 6B) is a pattern in which the convex lens 3 is rotated in the direction of arrow a. The pattern shape is the same as the light distribution pattern P0, and the bending point A of the cut line CL is shifted to the right. It has become. Although the light distribution pattern when the convex lens 3 rotates in the arrow b direction is not shown, the pattern shape is the same as the light distribution pattern P0, and the bending point A of the cut line CL is shifted to the left. For this reason, the vehicle headlamp according to the present embodiment has excellent follow-up performance corresponding to the traveling situation.

  Further, since the light distribution control means 20 controls the rotation of the resin unit casing 9 provided with the resin convex lens 3 other than the LED 1, the weight of the controlled body is reduced by reducing the weight of the controlled body. Can be reduced. For this reason, the vehicle headlamp of this embodiment has improved durability of the light distribution control means.

  Further, since the LED 1 is fixed to the fixed bracket 15, the heat of the LED 1 is radiated to the outside through the fixed bracket 15. For this reason, the vehicle headlamp of this embodiment has suppressed the excessive temperature rise in a lamp.

  Preferably, as in the present embodiment, the fixing bracket 15 is configured by drilling a bearing portion 25 (see FIG. 3) in a portion corresponding to the light emission center of the light emitting portion 1a. The shaft portion 5 provided at the portion corresponding to the light emission center of the light emitting portion 1a is supported by the bearing portion 25, and the other portion c2 is supported and attached to the actuator 21 constituting the light distribution control means 20.

  At this time, the bearing portion 25 is configured by a through hole formed in the upper frame member 17 of the fixed bracket 15, and the shaft portion 5 is configured by a stepped shaft that is integrally projected from the outside of the reflector 2. . The shaft portion 5 is attached so that its small diameter portion is inserted into the bearing portion 25 and is rotatably supported by a washer or a push nut.

  The other part supported by the actuator 21 is a rear part c2 of the unit casing 9 along the optical axis Z of the convex part 3 rather than the facing part c1, and is fixed to the rear flange 11a of the upper casing 11. It is composed of a stepped shaft 6 that projects integrally with the bracket 26. The stepped shaft 6 is attached to a bearing portion (not shown) of the movable arm 24 so as to be rotatably supported by a washer or a push nut.

  In this configuration, the unit casing 9 is rotated about the opposed portion c1 of the light emission center of the light emitting unit 1a of the LED 1 by the operation of the actuator 21 constituting the light distribution control means 20. For this reason, despite the rotation of the unit casing 9, there is no relative defocusing between the casing 9 and the LED 1, thereby eliminating the distortion of the light distribution pattern when the light distribution is variable. For this reason, the vehicle headlamp provided with this configuration has a further excellent tracking performance.

  More preferably, the heat dissipating means 27 is provided on the fixed bracket 15 as in the present embodiment. In the present embodiment, the heat radiating means 27 is composed of a plate-like body provided with heat radiating fins, and is fixed to the lower frame member 16 of the fixing bracket 15.

  In this configuration, since the heat radiating means 27 is provided on the fixed bracket 15, the weight reduction of the unit casing 9 including the convex lens 3 can be maintained as it is. For this reason, the vehicle headlamp having this configuration can dissipate the heat of the LED 1 to the outside more effectively through the heat dissipating means 27 while maintaining the durability of the light distribution control means 20.

  Further, since the heat dissipating means 27 is provided on the fixed bracket 15, there is no rotation after installation, and it is not necessary to secure a space required for the rotation. For this reason, the vehicle headlamp provided with this structure can comprise the whole lamp compactly.

  Furthermore, since the heat radiating means 27 can be designed freely according to the size of the fixed bracket 15, the degree of freedom in designing the heat radiating means 27 can be increased.

  FIG. 7 shows an assembled state of a plurality of projector-type headlamp units 10 applied to the vehicle headlamp as the second embodiment of the present invention. The vehicle headlamp of the second embodiment is different only in that a plurality of units 10 are used, and the structure and operation of each unit 10 are the same as those of the vehicle headlamp of the first embodiment. It is configured.

  That is, in the vehicle headlamp of the second embodiment, a plurality of LEDs 1 are provided, and a plurality of unit casings 9 including the convex lenses 3 are provided corresponding to each of the plurality of LEDs 1, It is supported by an actuator 21 that constitutes the light distribution control means 20 so that a plurality of the whole is synchronized. For this reason, the same components are denoted by the same reference numerals and description thereof is omitted. In FIG. 7, the reflector 2 is shown with one half cut away, and the upper frame member 17 of the fixing bracket 15 is omitted.

  Specifically, the fixing bracket 15 is formed in a long shape, and the plurality of LEDs 1 are fixed linearly to the bottom side portion 16a of the lower frame member 16 while maintaining an appropriate interval. In the second embodiment, five LEDs 1 are installed.

  Five unit casings 9 each including the convex lens 3 are provided corresponding to each of the five LEDs 1. At this time, the unit casing 9 is rotatably attached to the upper frame member (not shown) of the fixing bracket 15 so that the facing portion c1 of the light emitting portion 1a of the LED 1 is the center of rotation, and more convex than the facing portion c1. 3 is connected to the actuator 21 of the light distribution control means 20 by freely connecting the rear part c2 along the optical axis Z to the movable arm 24.

  At this time, the movable arm 24 is formed in a long shape, and supports the rear part c2 of the five unit casings 9 in a straight line while maintaining an appropriate interval, and the movable arm 24 moves in the c direction. Is transmitted to the unit casing 9 via the rear part c2, and the unit casing 9 including the five convex lenses 3 is in the direction of the arrow a or b (FIG. b) shows the state after turning in the a direction).

  Thereby, the vehicle headlamp according to the second embodiment can shift the light distribution pattern in the left-right direction in accordance with the traveling state, and thus has excellent tracking performance. The light distribution pattern at this time can obtain sufficient illuminance by the five LEDs 1.

  Therefore, since the vehicle headlamp of the second embodiment can provide a light distribution pattern having sufficient illuminance by the five LEDs 1, the compatibility as a vehicle headlamp can be further increased. .

  In addition, the vehicle headlamp according to the second embodiment requires the fixing bracket 15 to be formed long in order to fix the five LEDs 1 linearly, and the heat dissipating means set in the fixing bracket 15. 27 can be increased in size accordingly, and thereby a high-efficiency heat dissipating action can be secured, so that the temperature rise in the lamp can be effectively suppressed despite the setting of the five LEDs 1.

BRIEF DESCRIPTION OF THE DRAWINGS It is a projector type headlamp unit applied to the vehicle headlamp as 1st Embodiment of this invention, (a) is the top view, (b) is sectional drawing which follows the Ib-Ib line | wire of (a) (C) is the front view. It is a perspective view of the projector type headlamp unit of FIG. It is a perspective view for demonstrating the coupling | bonding state of the fixing bracket applied to the vehicle headlamp as 1st Embodiment, LED, a light distribution control means, and a thermal radiation means. It is a perspective view for demonstrating the coupling | bonding state of the projector type headlamp unit of FIG. 1, and a light distribution control means. It is a perspective view for demonstrating the coupling | bonding state of the projector type headlamp unit of FIG. 1, a fixed bracket, a light distribution control means, and a thermal radiation means. 1 is a graph showing a light distribution pattern of a vehicle headlamp as a first embodiment, wherein (a) shows a light distribution pattern at the front position of the projector-type headlight unit, and (b) shows a projector-type headlight unit. It is a light distribution pattern in the position after rotation. It is a perspective view which shows the assembly | attachment state to the fixed bracket of the several projector type headlamp unit applied to the vehicle headlamp as 2nd Embodiment of this invention, (a) is a projector type headlamp unit. (B) shows the assembled state at the position after the rotation of the projector type headlamp unit. It is a vertical side view of a conventional projector-type vehicle headlamp.

Explanation of symbols

1 LED
1a Light emitting part (LED)
2 Reflector 3 Convex lens 5 Shaft 9 Unit casing 10 Unit (Projector-type headlamp unit)
DESCRIPTION OF SYMBOLS 15 Fixed bracket 20 Light distribution control means 21 Actuator 25 Bearing part 27 Heat radiation means c1 Opposed part c2 Back part (other parts)
Z optical axis (for convex lens)

Claims (4)

A projector-type headlamp unit that reflects the light from the light source with a reflector and then emits it forward through a convex lens is adjusted horizontally by the light distribution control means that changes the irradiation direction and irradiation range according to the driving situation. A vehicle headlamp that is pivotally controlled and incorporated in a lamp housing,
The projector-type headlamp unit includes an LED as the light source that is fixed to a fixed bracket in the lamp housing with a light-emitting portion facing the reflector, and a rear portion that includes the reflector and rotates the portion facing the light-emitting portion. A resin unit casing that is pivotally attached to the fixed bracket as a moving center in a horizontal direction and controlled to rotate by the light distribution control means, and the resin unit casing that is attached to a front opening of the unit casing. A vehicular headlamp comprising a convex lens. The vehicle headlamp according to claim 1,
The fixing bracket has a bearing portion drilled at a portion corresponding to the light emission center of the light emitting portion,
The unit casing has a shaft portion provided at a portion corresponding to the light emission center of the light emitting portion supported by the bearing portion, and the other portion is supported and attached to an actuator constituting the light distribution control means. A vehicle headlamp characterized by that. The vehicle headlamp according to claim 1 or 2,
A vehicle headlamp, wherein the fixing bracket is provided with a heat dissipating means. The vehicle headlamp according to any one of claims 1 to 3,
A plurality of the LEDs are provided,
A plurality of unit casings having the convex lenses are provided corresponding to each of the plurality of LEDs, and supported by an actuator constituting the light distribution control means so that the whole of the plurality of units is synchronized. A vehicle headlamp characterized by comprising:

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