JP2013187028A - Vehicle headlamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector type lamp which can certainly shade light unnecessary for forming a light distribution pattern and which does not shade as much as possible light effective for forming the light distribution pattern.SOLUTION: A fixed shade 16 of a projector type lamp 1 has an upper end edge 16a positioned at an upper side than a light distribution switching means 10, and the upper end edge 16a is constructed to be a circular arc shape being convex downwards. Thereby, light effective for formation of a low-beam light distribution pattern LP is not shaded and unnecessary light irregularly reflected by an upper surface or the like of the light distribution switching means 10 can be efficiently shaded.

Description

  The present invention relates to a vehicular headlamp including a light distribution switching type projector lamp that switches and irradiates a plurality of light distribution patterns in accordance with a traveling state of the vehicle.

For example, a vehicular headlamp used as a headlamp of a vehicle includes a lamp chamber including a housing having an opening formed in front of the vehicle and a front lens that closes the opening of the housing, and a projector is provided in the lamp chamber. A type lamp is arranged.

  The projector-type lamp includes at least a light source including a bulb, a reflector having a reflective surface for irradiating light from the light source forward, a projection lens disposed in front of the reflective surface, and a rear of the projection lens. The light from the projector type lamp irradiated from the projection lens is irradiated to the front of the vehicle through the front lens of the lamp chamber.

  For example, as disclosed in Patent Document 1 below, a cut-off line of a light distribution pattern is formed by the upper edge of the movable shade provided near the second focal point of the reflecting surface, and the movable shade is moved up and down by the light distribution switching means. Further, a fixed shade is provided between the projection lens and the movable shade.

  The fixed shade disclosed in the following Patent Document 1 has a plate shape that covers the lower front side of the movable shade, and does not enter the effective portion of the condensing lens (the ineffectiveness of the peripheral portion of the condensing lens). (Reflected light incident on the part) is shielded.

JP 2008-004456 A

  However, with the recent miniaturization of projector-type lamps, a part of the light reflected by the reflecting surface of the reflector is incident on the upper surface of the light distribution switching means, for example, and does not pass through the second focal point, and is irregularly reflected and projected lens. May be irradiated as stray light that does not contribute to the light distribution pattern.

  Therefore, unintentional light such as light that is incident on the upper surface of the light distribution switching means and is irregularly reflected enters the effective reflection surface of the projection lens and other parts, and is dazzling for oncoming vehicles and pedestrians when passing light distribution patterns. There was a risk of being irradiated with light.

  Therefore, the present invention has been made in view of the above problems, and even in a miniaturized projector-type lamp, light that does not contribute to the light distribution pattern is prevented from entering the projection lens, and an appropriate light distribution pattern is obtained. It is an object of the present invention to provide a lamp that forms a lamp.

  In order to solve the above-described problems, a light source, a reflector having a reflecting surface that reflects light from the light source toward the front of the vehicle, a projection lens that transmits reflected light from the reflecting surface and irradiates forward, and the reflector A movable shade that switches between a passing light distribution pattern and a traveling light distribution pattern by blocking a part of the reflected light from the reflecting surface, and an arrangement for moving the movable shade. In the vehicle headlamp provided with the light switching means, a fixed shade that shields light that is not shielded by the movable shade among the reflected light from the reflective surface is provided between the projection lens and the movable shade. An upper end portion of the fixed shade is located above the upper surface of the light distribution switching means, and an upper end edge of the fixed shade is an arc shape curved downward on the vehicle. It is formed in, characterized by.

  The fixed shade is arranged to be inclined downward toward the projection lens, the lower end edge is formed longer than the upper end edge, and the lower end edge is formed integrally with the frame along the projection lens. It is characterized by being.

  A side end portion of the upper end edge of the fixed shade is provided in front of the center of the upper end edge and above the center portion.

  According to the present invention, even in a miniaturized projector-type lamp, light that has been irregularly reflected by the upper surface of the light distribution switching means and other portions can be reliably blocked from entering the projection lens, and light that becomes stray light A vehicle headlamp that can reliably prevent the irradiation of the vehicle is realized.

The front view which shows the projector type lamp concerning this invention. Sectional drawing showing the AA cross section in FIG. FIG. 3 is an enlarged perspective view showing the inside of the projector lamp according to the present invention. The expanded sectional view of the flame | frame of the AA cross section in FIG. The expanded sectional view of the light distribution switching means part in FIG. The figure which shows a passing light distribution pattern. The figure which shows the light distribution pattern for driving | running | working.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

  FIG. 2 is a cross-sectional view schematically showing Embodiment 1 of the vehicle headlamp of the present invention. FIG. 2 shows, for example, a projector-type lamp 1 for a vehicle headlamp. In FIG. 2, the x, y, and z directions are shown to coincide with the vehicle width direction, height direction, and front-rear direction, respectively, when the vehicle headlamp is attached to the vehicle.

<Overall configuration>
A projector-type lamp 1 in FIG. 1 is disposed in a lamp chamber of a vehicle headlamp formed by an outer lens (not shown) and a housing, and forms a passing light distribution pattern and a traveling light distribution pattern. 1. The vehicle headlamps are provided on the left and right sides at the front end of the vehicle.

  The projector lamp 1 includes a projection lens 2, a light source 3, a reflector 4, a movable shade 6, a fixed shade 16, and a light distribution switching means 10.

  The light source 3 includes a discharge lamp, a high-intensity discharge lamp (HID) such as a so-called metal halide lamp. The light source 3 is detachably attached to the reflector 4 via a socket 12. In the light emitting portion of the light source 3, the first focal point F1 of the reflector 4 is set.

  On the inner surface of the reflector 4, the light emitting portion of the light source 3 is a first focal point F <b> 1 and the second focal point F <b> 2 is in the vicinity of the rear focal point of the projection lens 2 by aluminum vapor deposition or silver coating. A reflecting surface 5 made of a curved surface is formed. The reflector 4 is fixedly held on the vehicle rear side of the frame 9.

  In addition, an opening for holding and fixing the light source 3 is provided in the rear portion of the reflector 4, and the light source 3 (for example, a discharge lamp bulb) is inserted and fixed from the rear side.

  The projection lens 2 has a convex shape on the front side of the vehicle, a planar shape on the rear side of the vehicle, and is formed so that the second focal point F2 of the reflecting surface 5 is located in the vicinity of the rear focus of the projection lens 2. ing. The projection lens 2 may be a lens formed from a free-form surface. The projection lens 2 is fixedly held on the vehicle front side of the frame 9.

  The movable shade 6 blocks the light from the light source 3 reflected by the reflecting surface 5, and forms a predetermined passing light distribution pattern LP shown in FIG. In addition, FIG. 6 is explanatory drawing of the light distribution pattern projected on the screen 10 m ahead from the vehicle headlamp in this Example. In FIG. 6, the code HH line indicates the horizontal line of the screen, and the code VV line similarly indicates the vertical line of the screen.

  Further, the movable shade 6 is moved upward and downward by a solenoid and a spring member 14 as the light distribution switching means 10 so that the passing light distribution pattern LP shown in FIG. 6 and the traveling light distribution pattern shown in FIG. It can be switched to HP.

  The movable shade 6 includes a first shade 7 and a second shade 8, and has a thin plate structure having elasticity such as SUS (spring steel plate). The first shade 7, the second shade 8, and the spring member 14 are integrally formed. Make. The first shade 7 and the second shade 8 are fixed by caulking, riveting, spot welding, or the like, and a gap of a predetermined interval is provided between the first shade 7 and the second shade 8. . Further, the upper end edges of the two shades face each other almost in parallel with a gap therebetween.

  As shown in FIG. 5, the first shade 7 is located on the light source 3 side, and has a shape that forms a cut-off line of the passing light distribution pattern LP at the upper edge, and is orthogonal to the optical axis ZZ. It is provided to do. A fixing portion 15 is provided on the lower end side of the first shade 7 and is fixed to the advance / retreat rod 11 of the light distribution switching means 10.

  The second shade 8 is located on the projection lens 2 side so as to face the first shade 1, and has a shape that forms a cut-off line of the passing light distribution pattern LP at the upper end edge, and has an optical axis ZZ. It is provided so as to be orthogonal to. The lower edge of the second shade 8 is provided so as to be positioned closer to the projection lens 2 than the upper edge.

  The first shade 7 is installed substantially vertically, and the second shade 8 is configured such that the lower end edge is disposed closer to the projection lens 2 than the upper end edge, and therefore the second shade 8 is inclined. By arranging in this manner, the gap between the first shade 7 and the second shade 8 is formed so as to increase from the upper end edge toward the lower end edge.

(Fixed shade)
As shown in FIGS. 1 to 4, the fixed shade 16 is located between the movable shade 6 and the projection lens 2, and is provided integrally with the frame 9 below the frame 9. The reflective surface portion may be formed by performing vapor deposition or painting on the surface of the fixed shade 16.

  The fixed shade 16 has an upper end edge 16a and a lower end edge 16b having an arc shape, the upper end edge 16a is located above the light distribution switching means 10, and is formed integrally with the frame 9 at the lower end edge 16b. Yes. The lower end edge 16b is configured to be longer than the upper end edge 16a. The fixed shade 16 is formed in a fan shape when viewed from the front.

  As shown in FIG. 4, the upper edge 16a has a central portion 16a1 on a substantially vertical cross section of the optical axis ZZ of the projector lamp 1, and is lateral to the lateral side of the central portion 16a1. An end portion 16a2 is formed.

  The central portion 16a1 of the upper edge 16a is formed at the lowermost position of the upper edge 16a and is provided in the vicinity of the light distribution switching means 10 most.

  The side end portion 16a2 of the upper end edge 16a is provided on the upper side of the vehicle with respect to the center portion 16a1, and is formed so as to spread laterally from the side end portion 16a2 to the lower end edge of the fixed shade 16. Yes. Further, the side end portion 16a2 is provided symmetrically about the vertical axis of the central portion 16a1.

(Light distribution switching means)
The light distribution switching means 10 is, for example, a driving device such as a solenoid, and moves (rotates, moves) the movable shade 6 to a first position where the passing light distribution pattern HP is formed and a second position where the traveling light distribution pattern is formed. It is positioned so that it can be switched. The light distribution switching means 10 includes an advance / retreat rod 11 and a fixed portion 15.

  The light distribution switching means 10 is provided with an advance / retreat rod 11, and the light distribution switching means 10 is fixed to the lower side of the frame 9 by a fixing pin 13.

  The movable shade 6 is attached to the distal end portion of the advance / retreat rod 11 via the fixed portion 15. As a result, when the light distribution switching means 10 is not energized, the advance / retreat is performed by the spring force of the spring member 14 of the movable shade. When the rod 11 extends, the movable shade 6 is positioned at the first position. When the light distribution switching means 10 is energized, the advance / retreat rod 11 contracts against the spring force of the spring member 14, so that the movable shade 6 is positioned at the second position.

(Description of the operation of the first embodiment)
The vehicle headlamp 1 according to the first embodiment is configured as described above, and the operation thereof will be described below.

  First, the light source 3 is turned on. Then, the light from the light source 3 is reflected by the reflecting surface 5 of the reflector 4. The reflected light is condensed at the second focal point F 2 of the reflecting surface 5, and part of the reflected light is shielded by the movable shade 6 installed near the second focal point F 2, and the unshielded light passes through the projection lens 2. Is irradiated forward. The irradiation light is irradiated forward as a low beam from which a predetermined light distribution pattern LP shown in FIG. 6 is obtained or a high beam from which a predetermined traveling light distribution pattern HP is obtained.

  Next, the light distribution pattern switching means of the projector type lamp 1 will be described. The light distribution switching means 10 is assembled to the lower side of the frame 9 by a fixing pin 13. When the light distribution switching means 10 is not energized, the forward / backward rod 11 of the light distribution switching means 10 is in the forward state (extended state) by the spring force of the spring member 14, and the movable shade 6 is positioned at the light shielding position. Thus, a passing light distribution pattern LP is formed. Further, at the time of energization, the advance / retreat rod 11 enters a retracted state (a contracted state) against the spring force of the spring member 14. Thereby, the movable shade 6 is located at the avoidance position, and the traveling light distribution pattern HP is formed.

  At that time, the light distribution switching means 10 is located in the vicinity of the movable shade 6 and is fixed even when the reflected light L2 from the reflection surface 5 is incident on the upper surface of the light distribution switching means 10 and is irregularly reflected. Since the upper end edge 16a of the shade 16 is positioned above the light distribution switching means 10, and the upper end edge 16a of the fixed shade 16 has an arc shape curved downward on the vehicle, the reflected light L2 is applied to the projection lens 2. There is no incident.

  The fixed shade 16 is disposed to be inclined downward toward the projection lens 2, the lower end edge 16 b is formed longer than the upper end edge 16 a, and the lower end edge 16 b is integrally formed along the frame 9 of the projection lens 2. Therefore, it is possible to increase the light shielding amount of the fixed shade 16 on the projection lens 2 side, and it is possible to shield not only the light distribution switching means 10 but also the light irregularly reflected from the lower part of the frame 9 in the reflected light L2. it can.

  Since the side end portion 16a2 of the upper end edge 16a of the fixed shade 16 is provided in front of the center portion 16a1 of the upper end edge 16a and above the center portion 16a1, the light distribution pattern LP for passing is provided. The light necessary for forming the light can be shielded as much as possible, and the light irregularly reflected by the upper surface of the light distribution switching means 10 or the frame 9 can be shielded.

(Explanation of effect of embodiment)
As described above, in the present embodiment, even in the miniaturized projector-type lamp 1, the light necessary for forming the passing light distribution pattern LP is not shielded, but by the upper surface of the light distribution switching means 10 or other portions. It is possible to reliably block the diffusely reflected light from entering the projection lens 2, and to ensure that stray light is irradiated without reducing the light effective for forming the passing light distribution pattern LP. Can be prevented.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Projector type lamp, 2 ... Projection lens, 3 ... Light source, 4 ... Reflector, 5 ... Reflecting surface, 6 ... Movable shade, 7 ... 1st shade, 8 ... 2nd shade, 9 ...... Frame, 10 ... light distribution switching means, 11 ... advance / retreat rod, 12 ... socket, 13 ... fixing pin, 14 ... spring member, 15 ... fixed part, ZZ ... optical axis, F1 ... 1st focus, F2 ... 2nd focus, LP ... Passing light distribution pattern, HP ... Traveling light distribution pattern, L ... Light, L2 ... Reflected light

Claims (3)

  A light source, a reflector having a reflective surface that reflects light from the light source forward of the vehicle, a projection lens that transmits the reflected light from the reflective surface and irradiates forward, and between the reflector and the projection lens A movable shade that switches between a light distribution pattern for passing and a light distribution pattern for traveling while blocking a part of the reflected light from the reflection surface, and a light distribution switching means for moving the movable shade. In the vehicle headlamp, a fixed shade is disposed between the projection lens and the movable shade to block light that is not blocked by the movable shade among the reflected light from the reflecting surface. The upper end edge of the fixed shade is positioned above the upper surface of the light distribution switching means, and the upper end edge of the fixed shade is formed in a circular arc shape curved to the vehicle lower side. Vehicle headlamp and butterflies.   The fixed shade is arranged to be inclined downward toward the projection lens, and a lower end edge is formed longer than the upper end edge, and the lower end edge is integrated with the frame along the projection lens. The vehicular headlamp according to claim 1, wherein the vehicular headlamp is formed. The lateral end portion of the upper end edge of the fixed shade is provided in front of the vehicle with respect to the center portion of the upper end edge and above the center portion. The vehicle headlamp described in 1.

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