JP6171168B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a vehicular headlamp, and more particularly to a vehicular headlamp capable of switching between a traveling beam light distribution and a passing beam light distribution.

  Conventionally, a light-emitting diode is used as a light source, and a part of the light-emitting diode is covered with a movable light-shielding member, and a light distribution for passing beam (commonly known as `` high beam '') is used (also known as `` low beam ''). There is known a vehicular headlamp that can be switched to (see, for example, Patent Document 1).

  In the vehicle headlamp described in Patent Document 1, when a light shielding member covers a part of the light emitting surface of the light emitting diode, a cut-off line formed by the horizontal line and the diagonal line of the light shielding member is provided. When the light distribution for passing beam is formed and the light-shielding member does not cover a part of the light emitting surface of the light emitting diode, the light distribution for traveling beam is formed.

JP 2012-18839 A

  However, in the vehicle headlamp described in Patent Document 1, since the same optical system is used for light distribution for traveling beam and light distribution for passing beam, the degree of freedom of light distribution is small. There is a problem that an optimal light distribution pattern cannot be formed for each of them.

  Further, in the above vehicle headlamp, at the time of light distribution for the passing beam, a part on the light emitting surface of the light emitting diode is covered with the light shielding member to completely shield the light so that the portion covered with the light shielding member is not covered. Since the light is concealed and lost for illumination and is not used at all, there is a problem that the utilization efficiency of the light emitted from the light emitting diode is poor.

  Furthermore, since the cut-off line formed during the light distribution for the passing beam is formed by the edge of the horizontal line and the oblique line formed on the light shielding member, the position of the light emitting surface of the light emitting diode and the position of the optical system are If the position of the light-shielding member is shifted, the aiming position of the light distribution for the passing beam and the main optical axis of the light distribution for the traveling beam may be shifted, and the light distribution pattern according to the regulations may not be satisfied. was there.

  Therefore, the present invention has been made in view of the above-described problems, and is switched to a light distribution suitable for the light distribution for the passing beam at the time of light distribution for the passing beam, and suitable for forming the light distribution for the traveling beam at the time of the light distribution for the traveling beam. An object of the present invention is to provide a vehicular headlamp that can be switched to a light distribution. Another object of the present invention is to provide a vehicular headlamp that can improve the light utilization efficiency during light distribution for the passing beam as compared with the prior art.

  The present invention has been proposed to achieve the above object, and the vehicle headlamp of the present invention is a vehicle headlamp that can be switched between a light distribution for traveling beam and a light distribution for passing beam. A light source module in which a light emitting diode is disposed, a light incident surface for a low beam for irradiating light directly emitted from a light emitting surface of the light emitting diode with the light distribution for the low beam, and a light incident for the low beam A projection having a traveling beam light incident surface that is formed on the lower side of the surface and that irradiates the traveling beam light distribution on the passing light distribution surface formed by the passing beam light incident surface. A lens, a light shielding plate that is disposed in the light and that cuts the light from the light emitting surface toward the light incident surface for the traveling beam of the projection lens, and a low beam position that cuts the light Tsu Sorted and shading plate driving means for the to place switches the light shielding plate in one position of the high-beam position not, and configured to include a.

  Further, it is preferable that the light shielding plate is disposed so as not to overlap the light emitting surface of the light emitting diode in a front view.

  Further, it is preferable that at least 50% or more of the light directly irradiated from the light emitting surface of the light emitting diode is incident on the low beam light incident surface.

  According to the present invention, in the case of a passing beam, the light is switched to the passing beam light distribution that forms a light distribution pattern suitable for the passing beam light distribution, and in the traveling beam, a light distribution pattern suitable for the traveling beam light distribution is formed. Thus, it is possible to provide a vehicular headlamp that can be switched to a traveling beam light distribution. In addition, it is possible to provide a vehicle headlamp that can improve the overall light utilization efficiency including the time of passing beam compared to the conventional case.

It is a front view of the vehicle headlamp which is embodiment of this invention. It is a front view shown in the state where the projection lens of the vehicle headlamp shown in FIG. 1 was removed. It is the BB sectional drawing of FIG. 1 shown in the state at the time of the light distribution for passing beams. It is the BB sectional drawing of FIG. 1 shown in the state at the time of the light distribution for traveling beams. It is an image figure of the light distribution pattern formed by the headlamp for vehicles same as the above, (a) is the pattern at the time of light distribution for passing beams, (b) is the pattern at the time of light distribution for traveling beams. It is sectional drawing of the vehicle headlamp shown as one modification of this invention.

  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. In the following description, expressions indicating directions such as up and down and left and right are not absolute, and are appropriate when the posture of each part of the vehicle headlamp of the present invention is depicted. When the posture changes, it should be interpreted according to the change in posture.

  1 to 4 show a vehicle headlamp according to the present invention. FIG. 1 is a front view thereof, FIG. 2 is a front view thereof with a projection lens removed, and FIG. 3 is a cross beam arrangement. 1 is a cross-sectional view taken along the line BB in FIG. 1 in a light state, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.

  1 to 4, a vehicle headlamp 10 is applied to a headlamp of a vehicle such as an automobile, and is disposed on an optical axis Ax extending in the front-rear direction as shown in FIGS. 3 and 4. A projection lens (convex lens) 11, a light source module 12 disposed behind the projection lens 11, a support plate 13 that fixes and supports the light source module 12 on the optical axis Ax, and A holder 14 that connects the support plate 13 and the projection lens 11, a light shielding plate 15 that cuts a portion WH of the light W that goes directly from the light source module 12 to the projection lens 11 (see FIG. 3), and movement of the light shielding plate 15 A direct-type vehicular headlamp that includes a light-shielding plate driving mechanism 16 that controls switching, etc., and that directly emits direct light from the light source module 12 through the projection lens 11. It is configured as.

  The vehicular headlamp 10 is used as a part of the vehicular headlamp in a state where the vehicular headlamp 10 is incorporated in a lamp body or the like (not shown).

  The light source module 12 includes a light emitting diode (LED) 12a in which one or a plurality of light emitting diode chips are packaged, and a substrate 12b that supports the light emitting diode 12a.

  The support plate 13 is disposed along a vertical plane orthogonal to the optical axis Ax, and a plurality of heat radiation fins 13a extending in the vertical direction are formed on the rear surface.

  The projection lens 11 is a refractive entrance surface in which the front surface 11a is convex and the rear surface 11b is inclined forward with respect to a vertical plane orthogonal to the optical axis Ax, and is in a range of about three quarters from the upper side. L (a range L surrounded by a dotted line in FIG. 3 and FIG. 4) is provided with a light incident surface 17a for a low beam, and the remaining lower one-quarter range H (in FIG. 3 and FIG. 4). A traveling beam light incident surface 17b is provided in a range H) surrounded by a dotted line.

  The projection lens 11 is set so that the rear focal point F is positioned at the light emission center of the light emitting diode 12a, and the light from the light emitting surface LE of the light emitting diode 12a is transmitted to the vertical surface (surface in the YY direction shown in FIG. 1). ) Is emitted as parallel light, and is emitted as diffused light to the left and right sides in the horizontal plane (the plane in the XX direction shown in FIG. 1).

  Further, the low beam light incident surface 17a of the projection lens 11 irradiates the light W, which is directly incident from the light emitting surface LE of the light emitting diode 12a, forward with the low beam light distribution, for example, as shown in FIG. The light distribution pattern PL for the passing beam having the cut-off line 18 on the horizontal cut line hh is formed. In the passing beam light distribution pattern PL, the irradiation light is concentrated below the horizontal cut line hh.

  On the other hand, the traveling beam light incident surface 17b of the projection lens 11 projects the light WH directly irradiated from the light emitting surface LE of the light emitting diode 12a as shown by a dotted line with a reference numeral 19 in FIG. The light is guided so as to be emitted upward from 11. Then, the traveling beam light distribution as shown in FIG. 5B is obtained by superimposing the traveling beam light distribution on the passing light distribution surface that has passed through the passing beam light incident surface and irradiating it forward. A pattern PH is formed. In the traveling beam light distribution pattern PH, light emitted upward from the projection lens is distributed above the horizontal cut line hh.

  The light shielding plate 15 is a plate-like member, and is spaced from the light emitting surface LE of the light emitting diode 12a toward the projection lens 11 between the light emitting diode 12a and the projection lens 11, and light from the light emitting surface LE of the light emitting diode 12a. Is directly disposed on the projection lens 11 so as not to overlap the light emitting surface LE of the light emitting diode 12a in front view. As shown in FIG. 4, the light shielding plate 15 has the light W and WH directly irradiated from the light emitting surface LE of the light emitting diode 12 a on the passing beam light incident surface 17 a and the traveling beam light incident surface 17 b of the projection lens 11. The traveling beam positions (open positions) that allow the respective incident light beams and the light emitting surface LE of the light emitting diode 12a are directly irradiated as shown in FIG. The light beam WH incident on the traveling beam light incident surface 17b is cut, and the light beam W is allowed to be incident only on the low beam light incident surface 17a. Switching is possible in two stages. As shown in FIGS. 3 and 4, corresponding to the light shielding plate 15, an opening 20 that allows movement of the light shielding plate 15 is formed below the holder 14.

  As shown in FIG. 2, the light shielding plate 15 has an upper side 15a formed in a straight line. That is, the vehicular headlamp 10 according to the present embodiment does not need to provide a cut-off line forming edge on the light shielding plate 15, and can optically form a cut-off line on the projection lens 11 side as described above. it can.

  Further, the ratio of cutting the light W from the light emitting surface LE of the light emitting diode 12a toward the low beam light incident surface 17a when the light shielding plate 15 is disposed at the low beam position (light shielding position) is the light emitting surface of the light emitting diode 12a. It is set so that it is at least 50% or less of the total light directly irradiated from LE, and 50% or more of the light is incident on the low beam light incident surface 17a. In this embodiment, when the light shielding plate 15 is disposed at the low beam position (light shielding position), about one quarter (25%) of the light W is cut, and the remaining about three quarters (75%). ) Is incident on the light incident surface 17a for the low beam so as to increase the light use efficiency during the light distribution for the low beam.

  The light shielding plate driving mechanism 16 is a mechanism as light shielding plate driving means for switching and arranging the light shielding plate 15 to either the traveling beam position (open position) or the passing beam position (light shielding position). A light shielding plate 15 is disposed along the opening 20 of the holder 14. The light shielding plate driving mechanism 16 includes, for example, a driving source 16a such as a solenoid and a moving rod 16b that moves up and down by the driving force of the driving source 16a. It is attached so that it can move as a unit.

  When the moving rod 16b is moved upward together with the light shielding plate 15 by the drive of the drive source 16a, the light shielding plate driving mechanism 16 is disposed at the low beam position (light shielding position) and moves in the opposite direction. When the eaves 16b are moved downward together with the light shielding plate 15, the light shielding plate 15 is arranged at the traveling beam position (open position).

  Therefore, according to the vehicle headlamp 10, when the beam is passing, the light shield plate 15 is moved to the passing beam position (see FIG. 3) by moving the moving rod 16b upward, and the light emitting diode 12a Of the light W irradiated directly from the light emitting surface LE toward the projection lens 11, a part of the low beam light incident surface 17 a and the light WH toward the traveling beam light incident surface 17 b are cut by the light shielding plate 15. Irradiation is performed with the light distribution pattern for the passing beam shown in FIG.

  On the other hand, at the time of traveling beam, the moving rod 16b is moved downward, so that the light shielding plate 15 is moved to the traveling beam position (see FIG. 4) and is directed directly from the light emitting surface LE of the light emitting diode 12a to the projection lens 11. The light shielding plate 15 is disposed outside the light W to be irradiated, and the light W irradiated directly from the light emitting surface LE of the light emitting diode 12a toward the projection lens 11 is a light incident surface 17a for passing beam and light for traveling beam. It is incident on both surfaces of the incident surface 17b. Then, the traveling beam light distribution transmitted through the traveling beam light incident surface 17b is superimposed on the passing light distribution transmitted through the passing beam light incident surface 17a, and switched to the traveling beam light distribution by the projection lens 11. Irradiation is performed with the traveling beam light distribution pattern of FIG.

  As described above, in the vehicle headlamp 10 according to the present embodiment, the light shielding plate driving mechanism 16 switches the position of the light shielding plate 15 to either the passing beam position or the traveling beam position. Optimal light distribution patterns can be formed for each of the light distribution for the passing beam and the light distribution for the traveling beam.

  In addition, since the cut-off line 18 formed at the time of light distribution for the passing beam is optically incorporated in the projection lens 11, in the case where the cut-off line is formed on the light shielding plate in the conventional vehicle headlamp. When the position of the light shielding plate is deviated, the aiming position of the light distribution for the passing beam and the main optical axis of the light distribution for the traveling beam may be deviated, and the light distribution pattern in the law may not be satisfied. However, even if the light shielding plate 15 is slightly deviated from the position of the light emitting surface LE of the light emitting diode 12a and the projection lens 11, the cut-off line 18 is defined at the same position without being affected by the deviation. It is possible to satisfy the light distribution pattern on the law.

  Furthermore, in the vehicle headlamp 10 of the present embodiment, the light shielding plate 15 is separated from the light emitting surface LE of the light emitting diode 12a toward the projection lens 11, and the light emitted from the light emitting diode is directly shielded and lost. Absent. Thereby, even when the light shielding plate 15 is arranged at the light shielding position, the light shielding plate 15 does not overlap the light emitting surface LE of the light emitting diode 12a in front view and is not directly shielded, so that the light is emitted from the light emitting surface LE of the light emitting diode 12a. Strong light of the light can be irradiated to the projection lens 11 side, and the light utilization efficiency can be improved as compared with the conventional case.

  Further, the ratio of cutting the light W from the light emitting diode 12a toward the low beam light incident surface 17a when the light shielding plate 15 is disposed at the low beam position is at least 50% of the total light W irradiated from the light emitting diode 12a. Hereinafter, in this embodiment, only about one-quarter (about 25%) is cut, and the remaining about three-quarters (about 75%) are incident on the light beam incident surface 17a. Even if the light use efficiency for the light distribution for the passing beam is increased and the light amount emitted from the light emitting diode 12a is small, the light amount can be effectively used to satisfy the legal light amount. In this embodiment, for example, the total light for the traveling beam is set to 1000 lumens (lm), and the light for the passing beam is set to 750 lumens (lm).

  FIG. 6 shows a modification of this embodiment. In the above embodiment, the structure in which the light shielding plate 15 is vertically moved up and down by the light shielding plate driving mechanism 16 is disclosed. However, in this modification, the light shielding plate 15 disposed between the light emitting diode 12a and the projection lens 11 is disclosed. Are moved obliquely by the light-shielding plate driving mechanism 16, and other configurations are the same as those in FIGS. 1 to 5. Therefore, the same components are denoted by the same reference numerals, and redundant description is omitted.

  That is, in the modification shown in FIG. 6, the light shielding plate driving mechanism 16 is disposed obliquely in the vertical direction with respect to the optical axis Ax, and at the distal end portion of the moving rod 16b that moves obliquely in the vertical direction by the driving force of the driving source 16a. The light shielding plate 15 is attached so as to be movable together. When the moving rod 16b is moved obliquely upward together with the light shielding plate 15 by driving the drive source 16a, the light shielding plate 15 is disposed at the position for passing beam shown by the solid line in FIG. Is moved together with the light shielding plate 15 obliquely downward, the light shielding plate 15 is arranged at a traveling beam position indicated by a two-dot chain line in FIG.

  As described above, when the light shielding plate 15 is moved obliquely, the light beam can be switched between the beam position and the traveling beam position with a small amount of movement, and the switching operation time of the light shielding plate 15 can be shortened.

  According to the present embodiment, at the time of passing beam, when the light shielding plate 15 is arranged at the position of the passing beam by switching by the light shielding plate driving means 16, the projection lens 11 is irradiated directly from the light emitting surface LE of the light emitting diode 12 a. Of the emitted light, the light directed to the traveling beam light incident surface 17b is cut by the light shielding plate 15, and the light other than the cut light is incident on the passing beam light incident surface 17a of the projection lens 11, and the projection lens. 11, a light distribution pattern for passing beam is formed and irradiated forward.

  On the other hand, in the traveling beam, when the light shielding plate 15 is disposed from the passing beam position to the traveling beam position, the light irradiated directly from the light emitting surface of the light emitting diode 12a toward the projection lens 11 is incident on the passing beam light. The light is incident on both the light incident surfaces of the surface 17a and the traveling beam light incident surface 17b. Then, the projection lens 11 superimposes the light distribution for passing formed by the light incident surface 17a for the passing beam and the light distribution for traveling beam formed by the light incident surface for the traveling beam to superimpose the light distribution pattern for the traveling beam. Is irradiated forward. In this way, by switching the position of the light shielding plate 15, it is possible to form an optimal light distribution pattern for each of the passing beam light distribution and the traveling beam light distribution.

  It is also possible to optically incorporate a cut-off line formed during the light distribution for the passing beam into the projection lens. When the cut-off line is optically incorporated in the projection lens, if the cut-off line is formed by the edge of the horizontal line and the diagonal line formed on the light-shielding member in the conventional vehicle headlamp, the light-shielding member is displaced. However, there was a risk that the aiming position of the light distribution for the passing beam and the main optical axis of the light distribution for the traveling beam would be shifted, and the light distribution pattern in the law could not be satisfied. When the cut-off line is optically incorporated in the projection lens, even if the position of the light-shielding member is slightly deviated from the light emitting surface of the light emitting diode and the position of the projection lens, the influence of the deviation can be suppressed and cut. The off-line is defined at the same position and can satisfy the light distribution pattern in the law.

  Further, since the light shielding plate 15 is arranged so as not to overlap the light emitting surface LE of the light emitting diode 12a in front view, the light that is completely covered by the light shielding plate 15 from the light emitting diode 12a can be eliminated. . That is, even when the light shielding plate 15 is arranged, strong light among the light irradiated from the light shielding surface 15 and the light emitting surface LE of the light emitting diode 12a can be used for passing light distribution, so that the light utilization efficiency is higher than that of the conventional case. It becomes possible to improve.

  In addition, at least 50% or more of the light directly irradiated from the light emitting surface of the light emitting diode 12a is incident on the low beam light incident surface 17a. It becomes possible to improve more.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within a scope in which the object of the present invention can be achieved are included in the present invention.

DESCRIPTION OF SYMBOLS 10 Vehicle headlamp 11 Projection lens 12 Light source module 12a Light emitting diode 13 Support plate 14 Holder 15 Light shielding plate 16 Light shielding plate drive mechanism (light shielding plate drive means)
17a Passing beam light incident surface 17b Traveling beam light incident surface 18 Cut-off line Ax Optical axis H Traveling beam light incident surface range L Passing beam light incident surface range PL Passing beam light distribution pattern PH Traveling beam distribution Light pattern

Claims (3)

In vehicle headlamps that can be switched between light distribution for traveling beam and light distribution for passing beam,
A light source module in which a light emitting diode is disposed;
A light incident surface for a passing beam for irradiating light directly irradiated from the light emitting surface of the light emitting diode forward with the light distribution for the passing beam, and a lower side of the light incident surface for the passing beam, A projection lens having a traveling beam light incident surface for irradiating the traveling beam light distribution on the passing light distribution formed on the passing beam light incident surface;
A light shielding plate that is disposed in the light and cuts the light from the light emitting surface toward the light incident surface for the traveling beam of the projection lens;
A light-shielding plate driving means for switching and arranging the light-shielding plate at any one of the position for the passing beam that cuts the light and the position for the traveling beam that does not cut the light ,
The passing beam light distribution has a cut-off line with an oblique cut-off line,
The light shielding plate has an upper side formed in a straight line,
The vehicular headlamp characterized in that the cut-off line having an optically oblique cut-off line is formed on the projection lens side .   The vehicle headlamp according to claim 1, wherein the light shielding plate is disposed so as not to overlap the light emitting surface of the light emitting diode in a front view.   3. The vehicle according to claim 1, wherein at least 50% or more of light directly irradiated from the light emitting surface of the light emitting diode is incident on the light incident surface for the low beam. 4. For headlamps.

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