JP2017084455A - Vehicle lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture which can form main light distribution and light distribution radiated above the main light distribution with one lamp unit, and which can be miniaturized.SOLUTION: A vehicular lighting fixture includes: a semiconductor type light source; a second lens arranged in front of the light source; a first lens which is arranged between the light source and the second lens, and which, when a virtual light source is located at a base focus of itself, converts a light cone from the virtual light source to a cone connecting the second lens and the base focus of the second lens, and which converts the light from the virtual light source entering an incident surface on the outside in the horizontal direction inwardly so that the light enters the incident surface on the outside in the horizontal direction of the second lens; and a shade arranged between the first lens and the light source, and for forming a cutoff line. The firs lens has: a main lens part for main light distribution; and a sub lens part for light distribution pattern provided below the main lens part, and for radiating above the main light distribution. The shade has an opening provided for allowing the light to enter the sub lens part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular lamp.

  2. Description of the Related Art Conventionally, a first lens unit, a second lens unit, a light guide unit, and a light source, which are sequentially arranged from the vehicle front side to the vehicle rear side, are provided, and light from the light source is guided by the light guide unit. Then, in the vehicular lamp that forms the passing beam light distribution pattern by passing through the second lens unit and the first lens unit in this order and irradiating forward, the first lens unit and the second lens unit Is arranged on a reference axis extending in the vehicle front-rear direction, and the light guide unit includes an incident surface on which light from the light source enters the light guide unit, and the light source that enters the light guide unit. A light exit surface from which light from the light exits, and is disposed above the reference axis, the lower end edge of the light exit surface of the light guide portion includes a stepped edge portion having a shape corresponding to a cut-off line, The first lens unit and the first lens unit are disposed near the reference axis. The second lens unit constitutes a projection lens whose focal point is located in the vicinity of the stepped edge portion, the light source includes a horizontally long light emitting surface, and the horizontally long light emitting surface is an incident surface of the light guide unit. It is disposed above the reference axis and in the vicinity of the reference axis in the vicinity facing the incident surface, and the exit surface of the light guide unit and the incident surface of the second lens unit are in surface contact with each other, A vehicular lamp is known in which a rear focal plane of the projection lens substantially coincides with the stepped edge portion (see Patent Document 1).

  In this vehicular lamp, light directed downward from the light source is internally reflected by the lower surface of the light guide unit, and the light is guided by the light guide unit, so that the second lens unit is efficiently used to form a cut-off line. By making light incident well, it is intended to achieve high light utilization efficiency.

Japanese Patent Application Laid-Open No. 2015-79660

By the way, in the vehicular lamp of Patent Document 1, the use efficiency of light for the main light distribution is improved, but the upper part of the main light distribution that irradiates light to a sign or the like located at the upper front of the vehicle or the like. No consideration is given to the overhead light distribution applied to the light source.
For this reason, in order to form an overhead light distribution, it is necessary to provide another lamp unit and the like, and there is a concern that the size of the vehicle lamp may increase when viewed as a whole.

  The present invention has been made in view of such circumstances, and it is possible to form a main light distribution and a light distribution irradiated above the main light distribution with one lamp unit, and to reduce the size. An object is to provide a vehicular lamp.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) A vehicular lamp according to the present invention includes a semiconductor light source, a second lens disposed in front of the light source, a light source disposed between the light source and the second lens, and a virtual light source at its basic focal point. Is converted into a cone connecting the second lens and the basic focal point of the second lens, and the light source from the virtual light source incident on the incident surface on the outside in the horizontal direction. A first lens that is formed so as to be converted inward so as to be incident on an incident surface on the outer side in the horizontal direction of the second lens, and disposed between the first lens and the light source; A shade that forms a cut-off line, and the first lens is provided for a main light distribution main lens portion and a light distribution pattern that is provided below the main lens portion and that irradiates above the main light distribution A sub lens part, and The shade has an opening for passing the light from the light source provided in order to incident light from the light source to the sub lens unit.
(2) In the configuration of (1), the opening is located in the shade so that the light from the light source is not irradiated at the boundary between the main lens portion and the sub lens portion of the first lens. Is provided.
(3) In the configuration of (1) or (2), the opening is formed in a substantially arc shape in which the upper side of the opening is lowered downward from the left and right center side toward the left and right outer sides.
(4) In the configuration of any one of (1) to (3) above, the shade is provided with an eaves provided so as to be inclined downward at a predetermined angle from the upper side of the opening toward the first lens side. The eaves are provided in a predetermined range from the left and right central side of the upper side of the opening to the left and right outer sides.
(5) In any one of the constitutions (1) to (4), the exit surface of the sub lens unit is a light distribution image formed by light from the light source incident on the entrance surface of the sub lens unit. When viewed from the second lens side, the focal position of the second lens is set to the second position so that the light distribution pattern irradiated to the upper front of the vehicle has an inverted trapezoidal shape while expanding in the horizontal direction. It is formed so as to deviate from the basic focal point of the lens.
(6) In the configuration of (5), in order to enlarge a light distribution image formed by light from the light source incident on the incident surface of the sub-lens portion in the horizontal and vertical directions, the second lens side is viewed from the second lens side. When the emission surface of the secondary lens portion is in the horizontal direction, the focal position of the second lens is set to the second lens as the emission surface corresponding to the entrance surface on the left side from the left and right center side of the secondary lens portion. The lens is shifted to the left with respect to the basic focal point of the lens, and the focal point of the second lens is set to the basic focal point of the second lens from the center of the left and right sides of the sub-lens portion toward the output surface corresponding to the right incident surface. In the vertical direction, it corresponds to the incident surface on the upper side from the emitting surface corresponding to the lower incident surface to the emitting surface corresponding to the upper incident surface in the vertical direction. The second output is closer to the exit surface. The focal position of the lens is shifted to the lower side with respect to the basic focus of the second lens, and the light distribution pattern irradiated to the upper front of the vehicle with respect to the basic shape is an inverted base. The focal position of the second lens is formed so as to be shifted in the front-rear direction with respect to the basic focal point of the second lens so as to have a shape. When viewed from the second lens side, the exit surface corresponding to the entrance surface below the left and right center of the sub-lens portion is the first light distribution pattern so that the light distribution pattern irradiated on the second lens portion is inverted trapezoidal. The focal positions of the two lenses are shifted to the front side, which is the first lens side, with respect to the basic focal point of the second lens. Before corresponding to the entrance surface obliquely upward and laterally outward The focal position of the second lens is shifted toward the rear side away from the first lens with respect to the basic focal point of the second lens, and the emission surface corresponding to the left and right outer incidence surfaces is located on the upper side and the left and right sides. It is formed so that the amount of displacement is smaller than that of the exit surface corresponding to the entrance surface obliquely above.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to form the main light distribution and the light distribution irradiated above the main light distribution with one lamp unit, and it is possible to provide a vehicular lamp that can be miniaturized.

It is a top view of vehicles provided with a vehicular lamp of an embodiment concerning the present invention. It is a perspective view of the principal part of the lamp unit of embodiment which concerns on this invention. It is a perspective view for demonstrating the basic composition of the lamp unit of embodiment which concerns on this invention. It is the figure which showed only the shade of FIG. 3, (a) is a back view of a shade, (b) is a perspective view. It is a figure for demonstrating the 1st lens and 2nd lens of FIG. 3, and is the top view which looked at the 1st lens and the 2nd lens from the top. It is a figure which shows the light distribution pattern before adjusting the output surface of the 1st lens of FIG. It is a figure which shows the main ranges of the entrance plane of the 1st lens of FIG. FIG. 7 is a diagram illustrating a light distribution pattern after adjusting an emission surface of the first lens in FIG. 3 to improve a cut-off line warpage seen in the light distribution pattern in FIG. 6. It is a figure for demonstrating the method to further expand the light distribution pattern of FIG. It is a figure for demonstrating the light distribution control of the 2nd lens for expanding the light distribution pattern of FIG. It is a figure which shows the state which expanded the light distribution pattern of FIG. 8, (a) is a figure which shows the light distribution pattern of FIG. 8 before expanding a light distribution pattern, (b) is the light distribution control of a 2nd lens. It is a figure which shows the light distribution pattern after expanding a light distribution pattern by. It is a figure for demonstrating the point for further improving the light distribution pattern of FIG.11 (b), (a) is a side view for demonstrating a 1st lens, (b) is a 1st lens. It is a figure which shows the light distribution pattern which the light from an upper lens part forms, (c) is a figure which shows the light distribution pattern which the light from the lower lens part of a 1st lens forms. It is a perspective view which shows the external appearance of the 1st lens of Fig.12 (a). It is a figure which shows the main ranges of the entrance plane of the 1st lens of FIG. 13, (a) is a figure for demonstrating the structure for shifting the focus position of a 2nd lens to a perpendicular direction, (b). These are the figures for demonstrating the structure for shifting the focus position of a 2nd lens to a horizontal direction. It is a figure which shows the light distribution pattern which the light from the upper side lens part of the 1st lens of FIG. 13 forms. It is a figure which shows the low beam light distribution pattern which is the main light distribution as a vehicle lamp of embodiment which concerns on this invention. It is a figure for demonstrating the area | region used as the sublens part of the 1st lens of embodiment which concerns on this invention. It is a reverse view of the shade of embodiment which concerns on this invention. It is a figure explaining the state of the light which passes the opening of the shade of FIG. It is a figure for demonstrating the structure of the sub lens part of the 1st lens of embodiment which concerns on this invention, (a) is a figure which shows the main ranges of an entrance plane, (b) is a main part of a lamp unit. It is a top view. It is a figure for demonstrating the structure of the sub lens part of the 1st lens of embodiment which concerns on this invention, (a) is a figure which shows the main ranges of an entrance plane, (b) is the principal part of a lamp unit. FIG. It is a figure explaining the state by which the light distribution image was expanded by the sub lens part of the 1st lens of embodiment which concerns on this invention. It is a figure explaining the further adjustment of the sub lens part of the 1st lens of embodiment which concerns on this invention. It is a figure which shows the light distribution pattern irradiated above the main light distribution which the vehicle lamp of embodiment which concerns on this invention forms, and main light distribution.

  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. The same number is attached | subjected to the same element through the whole description of embodiment. In the embodiments and drawings, “front” and “rear” indicate “forward direction” and “reverse direction” of the vehicle, respectively, and “up”, “down”, “left” unless otherwise specified. "And" Right "respectively indicate directions viewed from the driver who gets on the vehicle.

  The vehicular lamp according to the embodiment of the present invention is a vehicular headlamp (101R, 101L) provided on each of the left and right sides of the front of the vehicle 102 shown in FIG. 1, and is simply referred to as a vehicular lamp.

  The vehicular lamp according to the present embodiment includes a housing (not shown) that opens to the front side of the vehicle and an outer lens (not shown) that is attached to the housing so as to cover the opening, and is formed by the housing and the outer lens. A lamp unit 10 (see FIG. 2) and the like are disposed in the lamp chamber.

FIG. 2 is a perspective view showing a main part of the lamp unit 10.
As shown in FIG. 2, the lamp unit 10 includes a semiconductor light source 20, a second lens 30 disposed in front of the light source 20, and a first lens 40 disposed between the light source 20 and the second lens 30. And a shade 50 disposed between the first lens 40 and the light source 20.

  The light source 20 is attached to a heat sink (not shown), and the second lens 30, the first lens 40, and the shade 50 are also attached to the heat sink using a holder (not shown).

As shown in FIG. 2, the first lens 40 is irradiated with a main light distribution main lens portion 40A corresponding to the main light distribution having an oblique cut-off pattern, and on the upper side of the main light distribution. A secondary lens unit 40B corresponding to so-called overhead light distribution, and the main lens unit 40A has two lens units, an upper lens unit 40a and a lower lens unit 40b. First, in order to facilitate understanding of the configuration of each lens unit, the description will be made sequentially from the state of the basic configuration shown in FIG. 3 before the first lens 40 has a plurality of lens units.
Further, FIG. 3 shows the most basic state, that is, a state before a configuration for forming a so-called overhead light distribution.

(Description of basic configuration)
Hereinafter, a basic configuration of the lamp unit 10 of the present embodiment will be described with reference to FIG.

(light source)
In the present embodiment, the light source 20 uses a semiconductor type LED in which the light emitting chip 21 is provided on the aluminum mounting substrate 22 provided with the power feeding structure. However, the light source 20 is not limited to the LED. (LD) may be a semiconductor light source.

  By the way, depending on the manufacturer, there is a case where a part of the light emitting chip 21 has a chip, and when there is a part of the chip as described above, the chip is disposed so that the part with the chip is positioned on the lower side in the vertical direction. Is preferred.

  In this way, when light is projected forward from the lamp unit 10, the chipped portion can be projected upward, and good light distribution can be achieved by letting it escape above the light distribution pattern. A pattern can be formed.

(Second lens)
The second lens 30 is formed using a transparent glass material, a resin material, or the like, and FIG. 3 shows only a portion that performs light distribution control. Flange (not shown) is provided on both sides in the vehicle left-right width direction (X-axis direction).

  The second lens 30 of the present embodiment has a rectangular outer shape when viewed from the light irradiation side, and the emission surface 31 that emits light is a substantially flat plane. It is not limited to a flat surface, but can be determined freely according to design requirements.

  On the other hand, the second lens 30 is formed as a free curved surface in which an incident surface 32 on which light is incident protrudes toward the light source 20, and a specific light distribution control state will be described later. Accordingly, the shape of the surface is such that light distribution control is performed so that light emitted forward from the emission surface 31 has a predetermined light distribution pattern.

The basic focal point SF (rear focal point) of the second lens 30 is located on the light source optical axis Z on the rear side of the light source 20.
By doing in this way, the 2nd lens 30 can be arrange | positioned so that it may approach the light source 20, and it is possible to make the lamp unit 10 compact in the front-back direction.

  Here, in general, even if the same material is used, the refractive index differs if the wavelength is different. If the wavelength dependency of the refractive index is large, spectroscopy is likely to occur, and blue spectral colors are likely to appear in a part of the light distribution pattern. .

  For this reason, the material used for the second lens 30 is not particularly limited as long as it is transparent. However, the influence of spectroscopy can be reduced by using a material having a small refractive index wavelength dependency. It is preferable to use an acrylic resin such as PMMA whose refractive index has a small wavelength dependency. In the present embodiment, the second lens 30 is formed of an acrylic resin.

(First lens)
The first lens 40 is formed using a transparent glass material, a resin material, or the like, and FIG. 3 shows only a portion that performs light distribution control. Flange (not shown) is provided on both sides in the vehicle left-right direction (X-axis direction).

  The first lens 40 is formed as a compound quadratic curved surface in which an incident surface 42 on which light from the light source 20 enters is woven by two axes in the horizontal direction and the vertical direction. In the present embodiment, the first lens 40 is formed. However, the horizontal axis and the vertical axis may be a flat incident surface defined by straight lines. For example, the horizontal axis may be a straight line. The incident surface may be curved in the first lens 40 defined by a curved line whose vertical axis is curved inward.

  On the other hand, the exit surface 41 of the first lens 40 is formed in a free-form surface so that incident light is irradiated to the second lens 30 side as a predetermined exit pattern, although a specific light distribution control state will be described later. Has been.

The first lens 40 is disposed between the light source 20 and the second lens 30 in order to make the light from the light source 20 incident on the second lens 30 efficiently. More specifically, the first lens 40 is a shade 50 described later. The basic focal point PF (rear focal point) of the first lens 40 is arranged so as to coincide with the reference point CP positioned so as to be positioned on the light source optical axis Z.
In the present embodiment, the distance from the first lens 40 to the basic focal point PF of the first lens 40 is approximately 5.5 mm.

  Even in the first lens 40, the material used for the first lens 40 is not particularly limited as long as it is transparent. However, since the first lens 40 is disposed near the light source 20, It is preferable that the first lens 40 is formed of a polycarbonate-based resin. In this embodiment, the first lens 40 is preferably formed of a polycarbonate-based resin, silicon (SLR), glass, or the like having excellent heat resistance.

(shade)
The shade 50 is formed using, for example, a material that does not transmit light, blocks a part of the light from the light source 20, and forms a cut-off line of the light distribution pattern.
When a transparent material that transmits light is used for the shade 50, surface coating may be performed using a paint that does not transmit light.

4 is a view mainly showing only the shade 50, FIG. 4 (a) is a rear view of the rear surface of the shade 50 as viewed from the light source 20, and FIG. 4 (b) is a perspective view. .
4 is the same as the light source optical axis Z shown in FIG. 3, and the X axis shown in FIG. 4 is the vehicle lateral width direction shown in FIG. 3 orthogonal to the Z axis. 4 is a horizontal axis, and the Y axis shown in FIG. 4 is a vertical axis that is perpendicular to the Z axis and the X axis and is the vehicle vertical direction shown in FIG.
In FIG. 4B, the light emitting surface 21a of the light emitting chip 21 of the light source 20 is shown.

As shown in FIG. 4, the shade 50 has a flat plate shape, and the upper side 51 of the shade 50 is formed in a cut-off line shape in order to form a cut-off line.
The shade 50 is formed of a metal plate having a thickness of approximately 0.2 mm.

Then, as shown in FIG. 4A, the reference point CP of the shade 50 is set so as to be positioned at the upper vertex of the inclined portion for forming the oblique cut-off line. As shown in b), it is located on the light source optical axis Z, and is set at a position on the light source 20 side of the upper side 51 of the shade 50.
The second lens 30 described above is arranged such that the basic focal point SF (see FIG. 3) of the second lens 30 is located on the light source optical axis Z on the rear side of approximately 14 mm from the reference point CP of the shade 50. ing.

Further, the shade 50 is arranged so that the reference point CP of the shade 50 is positioned approximately 1 mm forward from the light emission center of the light emitting surface 21 a of the light source 20.
As described above, since the reference point CP and the basic focal point PF of the first lens 40 coincide with each other, the light source 20 has the light emitting surface 21a positioned about 1 mm behind the basic focal point PF of the first lens 40. Has been placed.

  In this way, as shown in FIG. 4B, a part of the light from the light source 20 (see the light beam L1) is reflected by the surface of the upper side 51 of the shade 50, and the reflected light (see the light beam L1). ) Is irradiated near the upper part of the cut-off line of the light distribution pattern.

That is, the shade 50 is provided at a position where the light from the light source 20 reflected by the surface of the upper side 51 of the shade 50 is irradiated near the upper part of the cut-off line of the light distribution pattern.
As a result, a bright and dark boundary line in the cut-off line can be blurred, and a low beam light distribution pattern with high visibility can be obtained.

Next, light distribution control in the basic configuration of the lamp unit 10 of the present embodiment will be described.
First, a basic configuration for light distribution control of the first lens 40 and the second lens 30 will be described.

FIG. 5 is a top view of only the first lens 40 and the second lens 30 as viewed from above.
As shown in FIG. 5, the design for this basic light distribution control is performed on the assumption that the virtual light source 20 ′ exists at the basic focal point PF of the first lens 40, not the actual light source 20. In FIG. 5, a large number of straight lines shown from the basic focal point PF toward the first lens 40 and the second lens 30 indicate the light rays from the virtual light source 20 ′.
5 indicates a cone C connecting the second lens 30 and the basic focal point SF of the second lens 30.

  In FIG. 5, the radial light spread of the group of radiation rays from the virtual light source 20 ′ is shown as a light cone LC. As can be seen from FIG. 5, the light cone LC includes the second lens 30 and the second lens 30. It is in a state of spreading more rapidly than the cone C connecting the basic focal point SF of the lens 30, and the spreading method of the cone C and the light cone LC does not match.

  Then, when the light cone LC of the virtual light source 20 ′ is irradiated with the light toward the second lens 30 and the light is incident on the second lens 30, the second lens 30 is made considerably large.

  Therefore, between the virtual light source 20 ′ and the second lens 30, the light cone LC from the virtual light source 20 ′ is adjusted to the spread state of the cone C connecting the second lens 30 and the basic focal point SF of the second lens 30. The 1st lens 40 converted into is arranged.

  However, as can be seen from FIG. 5, even if the light incident on the incident surface 42 on the outer side in the horizontal direction of the first lens 40 is converted into a spread angle state similar to the spread state of the cone C, it still remains. For example, a light beam indicated by a dotted line LO is irradiated to the outside of the incident surface 32 of the second lens 30.

  Therefore, the first lens 40 further causes the light from the virtual light source 20 ′ incident on the incident surface 42 on the outer side in the horizontal direction of the first lens 40 to enter the incident surface 32 on the outer side in the horizontal direction of the second lens 30. The second lens 30 is formed so as to be converted inward.

  That is, when the first lens 40 is simply converted into a spread angle state similar to the spread state of the cone C, the first lens 40 emits a light beam as indicated by the dotted line LO that is irradiated laterally outside the incident surface 32 of the second lens 30. It is formed so as to irradiate the incident surface 32 of the second lens 30 by converting the direction.

  Specifically, with the light source optical axis Z as a reference, the incident surface on the outer side in the horizontal direction of the first lens 40 where the irradiation angle θ of light from the virtual light source 20 ′ with respect to the incident surface 42 of the first lens 40 is 35 degrees or more. As for the light incident on 42, when the light exits from the exit surface 41, the emitted light is converted inward so that it enters the entrance surface 32 on the outer side in the horizontal direction of the second lens 30. An emission surface 41 is formed.

  In the present embodiment, the light incident on the incident surface 42 on the outer side in the horizontal direction of the first lens 40 having an irradiation angle θ of 35 degrees or more is not converted inward to irradiate the second lens 30. Since the light does not enter the incident surface 32, the light incident on the incident surface 42 on the outer side in the horizontal direction of the first lens 40 having an irradiation angle θ of 35 degrees or more is converted inward to irradiate the second lens 30. However, it is needless to say that it is not an essential requirement that the irradiation angle θ is 35 degrees or more.

  That is, according to the size of the second lens 30 for miniaturization, as described above, the light incident on the incident surface 42 on the outer side in the horizontal direction of the first lens 40 spreads in the same manner as the spread state of the cone C. When the light is incident on the incident surface 42 on the outer side in the horizontal direction of the first lens 40, the light to be irradiated outside the incident surface 32 of the second lens 30 when converted into the angle state is inward. And the second lens 30 may be irradiated with the light.

  Here, considering the case where the first lens 40 is not provided, first, in order for the basic focal point SF of the second lens 30 to be positioned at or near the light emission center of the virtual light source 20 ′, the second lens is used. 30 needs to be arranged considerably forward, and in order to make the light from the virtual light source 20 ′ incident on the second lens 30 without waste, the spread of the light cone LC of the virtual light source 20 ′ It is necessary to make the second lens 30 large so as to match.

  On the other hand, in the present embodiment, the first lens 40 is provided between the second lens 30 and the virtual light source 20 ′, and the first lens 40 extends the light cone LC of the virtual light source 20 ′ with the second lens 30. The first lens 40 is converted to a state of a spread angle similar to the state of spread of the cone C connecting the first focal point SF of the second lens 30 and only the conversion causes the first lens 40 to deviate from the incident surface 32 of the second lens 30. The light incident on the incident surface 42 on the outer side in the horizontal direction is converted inward so as to be incident on the incident surface 32 on the outer side in the horizontal direction of the second lens 30 so as to irradiate the second lens 30.

Therefore, the second lens 30 can be arranged close to the virtual light source 20 ′, and the size of the second lens 30 can be greatly reduced.
The fact that the second lens 30 can be arranged close to the virtual light source 20 ′ means that the second lens 30 can be arranged close to the actual light source 20 (see FIG. 3).
As a result, in the present embodiment, since the second lens 30 that has been downsized can be disposed close to the light source 20, the lamp unit 10 can be made compact in both the front-rear direction and the left-right direction, and can be compact as a vehicular lamp. Can be.

  Next, with respect to the basic configuration of the first lens 40 and the second lens 30 as described above, as described with reference to FIG. 3, the shade 50 and the light source 20 are arranged, and a low beam having a cut-off line. A configuration for improving the cutoff line when the light distribution pattern is formed will be described.

  FIG. 6 is a diagram showing a light distribution pattern as a comparative example before obtaining a better light distribution pattern, and more specifically, the basic configuration of the first lens 40 and the second lens 30 described above. On the other hand, it is a figure which shows the light distribution pattern on a screen at the time of the state which only added the shade 50 and the light source 20, with an isoluminous intensity line. In FIG. 6, VU-VL is a vertical line on the screen, and HL-HR is a horizontal line on the screen.

  In the following, in the figures showing the light distribution pattern on the screen, VU-VL is a vertical line on the screen, and HL-HR is a horizontal line on the screen.

  As described above, since the shade 50 has a flat plate shape, the reference point CP of the shade 50 and the basic focal point PF of the first lens 40 coincide with each other, but from the reference point CP in the vehicle width direction or the lateral direction. The upper side 51 of the shade 50 that is far away causes a focus shift.

  For this reason, if nothing is done, the lower horizontal cutoff line warps like a circled area A shown in FIG. 6, and a gentle curve appears in the upper horizontal cutoff line like a circled area B. It becomes a state.

  Therefore, in the following, the shape of the emission surface 41 of the first lens 40 for suppressing such warping and bending will be described.

FIG. 7 is a view of the incident surface 42 of the first lens 40 as viewed from the light source 20 side, and schematically shows only the range of the main incident surface 42.
The X axis and the Y axis in FIG. 7 are the same as before, the X axis is the axis indicating the horizontal direction, the Y axis is the axis indicating the vertical direction, and the upper side in FIG. 7 is the upper side in the vertical direction.

  The range of right and left θ with respect to the center side of the incident surface 42 is that the irradiation angle of light from the virtual light source 20 ′ assumed at the basic focal point PF of the first lens 40 described with reference to FIG. The left and right ranges are shown as 35 °.

  In FIG. 7, numerical values are described on the outer incident surface on the outer side in the horizontal direction where the irradiation angle of light from the virtual light source 20 ′ is equal to or larger than the predetermined angle θ in the horizontal direction with respect to the light source optical axis Z of the light source 20. However, this numerical value indicates the positional deviation amount of the focal position of the second lens 30.

  More specifically, when light is emitted from the emission surface 31 (see FIG. 5) side of the second lens 30 toward the basic focal point SF side of the second lens 30, the light is fundamentally transmitted via the first lens 40. It goes to the focal point SF side.

  At this time, with respect to the light emitted from the outer incident surface on the outer side in the horizontal direction of the incident surface 42 of the first lens 40 shown in FIG. 7 to the basic focal point SF, the basic focal point SF corresponding to the numerical value described on the outer incident surface is obtained. It is shown that the focal position is deviated from.

  When the numerical value described on the outer incident surface is positive, the light passing therethrough is shifted in the vertical direction above the basic focal point SF by the numerical value, and conversely negative. This shows that the light passing there deviates the focal position by the numerical value below the basic focal point SF in the vertical direction (the numerical unit is mm).

Also, a dotted arrow is shown between the numerical values, but this arrow schematically shows that the numerical value is complemented from the base end side to the tip end side of the dotted arrow. It is.
The focal position shift state on the incident surface 42 is realized by the shape of the exit surface 41 (see FIG. 5) corresponding to the incident surface 42.

  That is, the first lens 40 has a horizontal direction across the light source optical axis Z in which the light irradiation angle from the virtual light source 20 ′ is equal to or larger than a predetermined angle θ in the horizontal direction with respect to the light source optical axis Z of the light source 20. Upper exit surfaces corresponding to the two upper entrance surfaces 42a located on the upper side from the vertical position (the same height position as the basic focal point PF) in the vertical direction, which is substantially the same as the light source optical axis Z, of the outer incident surfaces located outside. However, the upper exit surface corresponding to the upper outer side of the upper entrance surface 42a of the first lens 40 is formed so that the focal position of the second lens 30 is shifted upward in the vertical direction with respect to the basic focus SF of the second lens 30. Has been.

  In FIG. 7, the incident surface 42 is viewed from the light source 20 side, but the upper portion corresponding to the upper outer side of the upper incident surface 42 a of the first lens 40 also when viewed from the second lens 30 side. The exit surface is formed so that the focal position of the second lens 30 is shifted upward in the vertical direction with respect to the basic focal point SF of the second lens.

  Here, the upper incident surface 42a on the left side of FIG. 7 has a high contribution to the cut-off warped portion (circled area A in FIG. 6) on the right side of the light distribution pattern LP in FIG. The upper incident surface 42a has a high contribution to the cut-off curve portion (circled region B in FIG. 6) on the left side of the light distribution pattern LP in FIG. 6, and the focal position of the second lens 30 is basically set as described above. If the focus SF is shifted upward in the vertical direction, the light irradiated forward from the emission surface 31 of the second lens 30 corresponding to this portion falls downward.

  As a result, the warped part (circled area A in FIG. 6) and the curved part (circled area B in FIG. 6) are adjusted so as to be lowered, resulting in a flat cut-off line.

  On the other hand, as shown in FIG. 7, the first lens 40 is further lowered from the vertical position (the same height position as the basic focal point PF) in the vertical direction, which is substantially the same as the light source optical axis Z, of the outer incident surface. As for the lower emission surface corresponding to the two lower incidence surfaces 42b positioned, the focal position of the second lens 30 is set to the lower emission surface corresponding to the lower outer side of the lower incidence surface 42b of the first lens 40. It is formed so as to be shifted vertically downward with respect to the basic focal point.

  In FIG. 7, the incident surface 42 is viewed from the light source 20 side. However, when viewed from the second lens 30 side, the lower portion corresponding to the lower outer side of the lower incident surface 42 b of the first lens 40. The exit surface is formed so that the focal position of the second lens 30 is shifted downward in the vertical direction with respect to the basic focal point of the second lens 30.

  In other words, the light passing through the lower incident surface 42b of the first lens 40 is adjusted so that it slightly rises above the light distribution pattern LP (see FIG. 6), thereby matching the adjustment made by the upper incident surface 42a. Thus, the upper horizontal cutoff line on the left side of the light distribution pattern LP and the lower horizontal cutoff line on the right side of the light distribution pattern LP are flattened.

  When such light distribution control is performed, the state of the light distribution pattern LP shown in FIG. 8 is obtained, and the light distribution pattern LP having no warping and bending as shown in FIG. 6 is obtained.

  By the way, since the visibility can be improved by further expanding the light distribution pattern in the horizontal direction as compared with the light distribution pattern LP shown in FIG. 8, the configuration of the light distribution control for that purpose will be described below.

FIG. 9 is a top view of the first lens 40, the shade 50, and the light emitting chip 21 of the light source 20, as viewed from above. A schematic light distribution pattern is also shown on the upper side of FIG. In FIG. 9, a point of a code CP ′ is newly added.
CP ′ is a position on the first lens 40 side of the upper side 51 of the shade 50 located on the light source optical axis Z.

Then, as shown in FIG. 9, when the area is divided by lines (see arrows T1 and T2) passing through the position CP ′ from both the left and right ends of the light emitting chip 21, first, the light within the area (1) sandwiched between the lines. Forms the light distribution pattern (1) shown on the upper side of FIG.
That is, the light within the area (1) forms a light distribution pattern having substantially the same shape as the entire shape of the light distribution pattern.

  On the other hand, the light within the range of the left area (2) has almost the same shape as the light distribution pattern of (2) shown in the upper side of FIG. 9, that is, the shape of the light distribution pattern corresponding to the lower cut-off line on the right side. The light distribution pattern is formed.

  Similarly, the light within the range of the right area (3) is the light distribution pattern of (3) shown in the upper side of FIG. 9, that is, the shape of the light distribution pattern portion corresponding to the upper cutoff line and the oblique cutoff line on the left side. A light distribution pattern having almost the same shape as the above is formed.

The light distribution patterns LP shown in FIG. 8 are formed by multiplexing the light distribution patterns of (1) to (3).
Therefore, the light distribution pattern can be expanded in the horizontal direction by multiplexing the light distribution patterns of (2) and (3) so as to be shifted in the left-right direction with respect to the light distribution pattern of (1). it can.

  Specifically, by controlling the light distribution so that the light distribution pattern in (3) is shifted to the left side of the light distribution pattern in (1) and multiplexing the light distribution pattern, the entire distribution is achieved without affecting the oblique cut-off line. The horizontal range of the light pattern can be expanded to the left side, and similarly, the light distribution control is multiplexed so that the light distribution pattern of (2) is shifted to the right side of the light distribution pattern of (1). Thus, the horizontal range of the entire light distribution pattern can be expanded to the right without affecting the cut-off line.

Therefore, such light distribution control is performed by the second lens 30.
FIG. 10 is a diagram for explaining the light distribution control of the second lens 30.
Also in FIG. 10, in accordance with the description in FIG. 9, which range of light emitted from the second lens 30 corresponds to the light in the areas (1), (2), and (3) shown in FIG. This is indicated by ranges (1), (2), and (3) with double arrows.

As described above, the second lens 30 is optional with respect to the exit surface 31, and the light distribution control is performed by controlling the shape of the entrance surface 32 in consideration of the shape of the given exit surface 31. It is carried out.
In FIG. 10 as well, light rays from the virtual light source 20 ′ are drawn.

  As shown in FIG. 10, the incident surface 32 of the second lens 30 is the center corresponding to the area (1) shown in FIG. 9 of the incident surface 32 of the second lens as viewed from the light source 20 (see FIG. 3) side. The light incident on the side portion is irradiated from the emission surface 31 of the second lens 30 (see the range of the double-headed arrow (1) in FIG. 10) to the front side in a substantially parallel state, and viewed from the light source 20 side, FIG. The light incident on the incident surface 32 of the second lens 30 on the left side in the horizontal direction with respect to the center side portion corresponding to the area (1) shown in FIG. (Refer to the range), light that irradiates right frontward, and is incident on the incident surface 32 of the second lens 30 on the right side in the horizontal direction from the center portion corresponding to the area (3) shown in FIG. To the left front from the exit surface 31 of the second lens 30 (see the range of the double arrow (3) in FIG. 10). It is formed in a shape morphism.

  11 is a diagram for showing the result of expanding the light distribution pattern, and FIG. 11A is a light distribution pattern on the screen shown in FIG. 8 before the light distribution pattern LP is expanded. FIG. 11B is a diagram showing the light distribution pattern on the screen with the same luminous intensity line when the light distribution control for expanding the light distribution pattern by the second lens 30 is performed.

As can be seen by comparing FIG. 11A and FIG. 11B, the light distribution pattern LP is also shown when the light distribution control for expanding the light distribution pattern by the second lens 30 shown in FIG. 11B is performed. While maintaining the same good cut-off line as the light distribution pattern LP of 11 (a), the light distribution pattern LP spreads in the horizontal direction and has good visibility.
With the basic configuration as described above, a main light distribution having a cut-off line can be formed.

By the way, the basic configuration as described above does not have a configuration in which light is incident on a predetermined range of the lens using the light guide unit, unlike the vehicular lamp exemplified in the related art.
Here, the light that can be guided through the light guide unit is light that does not exceed the critical angle, and light that exceeds the critical angle leaks from the light guide unit.
For this reason, when the light guide is used to make light incident on a predetermined range of the lens as in the vehicular lamp exemplified in the prior art, the leaked light enters an unexpected part of the lens. There is a possibility that glare light will be incident upon re-incident, but there is no such worry if the configuration of this embodiment is adopted.

  In view of the size of the lamp unit, the first lens 40 is disposed between the second lens 30 and the light source 20, and the light cone LC is converted by the first lens 40. Since light distribution control is performed to convert light inward so that light that cannot enter the second lens 30 is incident on the second lens 30, the small second lens 30 can be disposed close to the light source 20. Therefore, miniaturization is possible.

  The basic configuration for forming the main light distribution having the cut-off line has been described above. The light distribution pattern configured in this way is as shown in FIG. As can be seen from (b), there is a light distribution portion MP having a high light intensity in an inverted trapezoidal shape on the center side of the light distribution pattern LP.

If there is such a light distribution portion MP having a high luminous intensity, the light distribution portion MP is reflected strongly on the road surface, so it is preferable to hesitate.
Further, the lower center of the light distribution pattern LP is in a state in which the bright and dark boundary lines are clear, and it is preferable that this portion is also blurred in order to improve visibility.

Therefore, the configuration for making the light distribution part MP and the light and dark boundary line part on the lower side of the light distribution pattern LP obscured by devising the light distribution control of the first lens 40 will be described below. To do.
In the following, although described in detail, the portion that further devise the light distribution control of the first lens 40 is the upper lens portion 40a of the main lens portion 40A touched with reference to FIG.

(Upper lens part)
FIG. 12 is a diagram for explaining points for further improving the light distribution pattern LP of FIG. 11B, and further improving the light distribution pattern LP of FIG. 11B with reference to FIG. The points for this will be described first, and then the specific configuration will be described.
FIG. 12A is a side view of the first lens 40, the shade 50, and the light emitting chip 21 of the light source 20 as viewed from the side.

FIG. 12B shows a screen formed by light emitted from the emission surface 41 above the portion indicated by the dotted line out of light emitted from the emission surface 41 of the first lens 40 in FIG. It is the figure which showed the above light distribution pattern with the isoluminous intensity line.
FIG. 12B shows a light distribution pattern after passing through the second lens 30.

Further, FIG. 12C is a diagram showing the light distribution pattern on the screen formed by the light emitted from the lower emission surface 41 as shown by the dotted line, by the isoluminous line.
FIG. 12C also shows the light distribution pattern after passing through the second lens 30.
Then, the light distribution patterns LP shown in FIG. 11B are configured by multiplexing the light distribution patterns shown in FIGS. 12B and 12C.

Here, focusing on FIG. 12 (b), the inverted trapezoidal high luminous intensity light distribution portion similar to the inverted trapezoidal luminous intensity distribution portion MP appearing at the center of the light distribution pattern LP in FIG. 11 (b). MP 'is seen.
Further, the light-dark boundary line portion on the lower center side of the light distribution pattern in FIG. 12B is in a state very similar to the light-dark boundary line portion on the lower center side of the light distribution pattern LP in FIG. I can see it.

On the other hand, in the light distribution pattern of FIG. 12C, a light distribution portion having a reverse trapezoidal shape with high light intensity is not seen, and the bright and dark boundary line portion on the lower center side of the light distribution pattern is also shown in FIG. The light distribution pattern LP is not very similar to the bright and dark border line portion on the lower center side.
Accordingly, the light distribution portion MP ′ formed by the light emitted from the emission surface 41 of the first lens 40 causes the light distribution portion MP in FIG. 11B and the light distribution pattern LP in FIG. Since it is considered that a light / dark boundary line portion has occurred, in order to decease the light / dark boundary line portion on the lower center side of the light distribution portion MP and the light distribution pattern LP in FIG. 11 (b), FIG. It would be good if the light distribution pattern was deceived.

Therefore, in the following, a configuration for making the light distribution pattern of FIG.
First, how the exit surface above the dotted line of the exit surface 41 of the first lens 40 shown in FIG. 12A is defined will be described.

  As shown in FIG. 12A, the light exit surface above the dotted line shows a straight line (see arrow T <b> 3) from the basic focal point PF of the first lens 40 to the incident surface 42 of the first lens 40. A vertical angle formed by the light source optical axis Z and a straight line (see arrow T3) is a light emitting surface 41 corresponding to the upper upper incident surface 42c which is equal to or greater than a predetermined angle β, and is a dotted line in FIG. Is the lower end of the exit surface 41 corresponding to the upper entrance surface 42c.

  The predetermined angle β is a straight line (see arrow T3) passing from the lower end of the light emitting chip 21 of the light source 20 through the basic focal point PF (also the reference point CP of the shade 50) of the first lens 40 and the light source optical axis of the light source 20. This is an angle formed with Z. In this embodiment, the predetermined angle β is approximately 30 °.

  Therefore, the upper emission surface 41 and the lower emission surface 41 are divided to perform light distribution control, and the light distribution pattern shown in FIG. ) The light distribution pattern shown in

  Specifically, when light is irradiated from the second lens 30 (see FIG. 3) side toward the basic focal point SF (see FIG. 3) of the second lens 30, the upper upper side in the vertical direction that is a predetermined angle β or more. On the exit surface 41 corresponding to the entrance surface 42 c, the shape of the exit surface 41 on the upper side of the first lens 40 so that the focal point of the second lens 30 is shifted in the horizontal direction and the vertical direction with respect to the basic focus SF of the second lens 30. Adjust.

FIG. 13 is a perspective view showing the first lens 40. The X axis, the Y axis, and the Z axis are the same as before.
As described above, the first lens 40 performs light distribution control by dividing the upper emission surface 41 and the lower emission surface 41.

  For this purpose, as described with reference to FIG. 12A, the first lens 40 draws a straight line from the basic focal point PF of the first lens 40 to the incident surface 42 of the first lens 40. As shown in FIG. 13, a portion corresponding to the upper incident surface 42 c on the upper side in the vertical direction in which the vertical angle formed by the light source optical axis Z and the straight line (see arrow T <b> 3 in FIG. 12A) is equal to or greater than the predetermined angle β. The upper lens portion 40a.

  When the upper lens portion 40a is configured as described above, the upper incident surface 42a and the upper incident surface 42a described with reference to FIG. 7 are above the light source optical axis Z of the light source 20, and the upper lens portion 40a. The upper incident surface 42a and the upper exit surface corresponding to the upper incident surface 42a are also in the range from the light source optical axis Z of the light source 20 to the upper lens portion 40a. Become.

  In addition, the lower incident surface 42b described with reference to FIG. 7 and the lower exit surface corresponding to the lower incident surface 42b do not substantially change the range even when the upper lens portion 40a is configured in this way.

FIG. 14 is a view of the main range of the incident surface 42 of the first lens 40 as viewed from the light source 20 side. The X axis and the Y axis are the same as those in FIG. 13, and the upper side in the drawing is the upper side in the vertical direction. .
FIG. 14A is a diagram for explaining the content of shifting the focal position of the second lens 30 in the vertical direction with respect to the basic focal point SF, and FIG. 14B is a diagram illustrating the focal position in the horizontal direction. It is a figure for demonstrating the content slipped on.

  Specifically, first, as shown in FIG. 14A, the upper lens portion 40a (see FIG. 13) has an upper exit surface 41c (see FIG. 13) corresponding to the upper entrance surface 42c, and the upper entrance surface 42c. The upper emission surface 41c () corresponding to the upper emission surface 41c corresponding to the upper side of the second lens 30 is displaced from the basic focus SF of the second lens 30 by the numerical value shown in FIG. 13) is formed.

Note that the numerical values shown in FIG. 14A are also complemented between the numerical values in the same manner as described with reference to FIG. 7, and the unit of the numerical values is mm.
Further, when the numerical value is positive, it indicates that the focal position is shifted upward in the vertical direction with respect to the basic focal point SF of the second lens 30.

  Here, since the vertical relationship in the vertical direction is the same when viewed from the second lens side, the state shown in FIG. 14A is that the upper exit surface 41c (see FIG. 13) corresponding to the upper entrance surface 42c. When viewed from the second lens 30 side, the upper emission surface 41c corresponding to the upper side of the upper incident surface 42c is positioned so that the focal position of the second lens 30 is vertically higher than the basic focal point SF of the second lens 30. It has become slippery.

  Further, the upper lens portion 40a is formed such that the upper emission surface 41c (see FIG. 13) is shifted vertically upward with respect to the basic focal point SF of the second lens 30 with respect to the basic focus SF of the second lens 30. Instead, it is formed so as to be shifted in the horizontal direction. Hereinafter, shifting the focal position in the horizontal direction will be described with reference to FIG.

  The numerical values shown in FIG. 14 (b) are such that between the numerical values are complemented in the same manner as in FIG. 14 (a), and the unit of the numerical values is mm. A positive notation indicates that the focal position is shifted to the right side when viewed from the rear side of the basic focus SF, and a negative notation indicates that the focal position is shifted to the left side.

When the state shown in FIG. 14B is viewed from the second lens 30 side, only the left-right relationship is reversed.
Accordingly, the upper emission surface 41c (see FIG. 13) of the upper lens portion 40a of the first lens 40, when viewed from the second lens 30 side, corresponds to the upper emission surface 42c corresponding to the upper right incidence surface 42c from the horizontal center. The focal position of the second lens 30 is shifted to the right with respect to the basic focal point SF of the second lens 30 as the surface 41c is increased, and the upper emission surface 41c corresponding to the upper left incident surface 42c from the horizontal center is the second The focal position of the lens 30 is shifted to the left with respect to the basic focal point SF of the second lens 30.

  When the upper lens portion 40a of the first lens 40 is configured as described above, first, the focal position of the second lens 30 is shifted vertically upward with respect to the basic focal point SF of the second lens 30 as shown in FIG. ) So that the light distribution pattern shown in FIG.

  If the light distribution control is performed in this way, it is difficult to irradiate light upward even if the vertical position shift of the light source 20 occurs. Therefore, glare due to the vertical position shift of the light source 20 occurs. Light generation is less likely to occur.

  Further, by shifting the focal position of the second lens 30 in the horizontal direction with respect to the basic focal point SF of the second lens 30, the light distribution pattern is preferably expanded in the horizontal direction and is preferably shown in FIG. The light distribution part MP ′ having a high light intensity in the inverted trapezoidal shape can be removed.

  As a result, as shown in FIG. 15, the light distribution pattern shown in FIG. 12B has an inverted trapezoidal light distribution portion MP ′ having a high luminous intensity and a portion where the light / dark boundary line is clear. Not a good light distribution pattern.

  FIG. 16 shows a light distribution pattern LP (low beam light distribution pattern which is the main light distribution of the lamp unit) in which the light distribution pattern of FIG. 12C and the light distribution pattern of FIG. 15 are multiplexed. The inverted light trapezoidal light distribution portion MP that appears in the light distribution pattern LP in FIG. 11B disappears, and the clear light and dark boundary line at the lower center of the light distribution pattern disappears. Recognize.

  Incidentally, since the first lens 40 divides the emission surface 41 into an upper side and a lower side so as to form the upper lens portion 40a, as can be seen from FIG. There is a step between the lower emission surface 41.

In order to prevent the light from this step from being irradiated upward and becoming glare light, as shown in FIG. 13, the first exit surface 41c of the upper lens portion 40a and the first lens located below the upper lens portion 40a. The connection surface 45 of the lens portion 40b of the lens 40 with the exit surface 41d extends forward from the lower end of the upper exit surface 41c and exits from the lens portion 40b of the first lens 40 located below the upper lens portion 40a. It is preferable to use an extended surface connected to the upper end of 41d.
That is, it is preferable that the upper exit surface 41c of the upper lens portion 40a is not positioned on the front side of the exit surface 41d of the first lens 40 located on the lower side.

With this configuration, the light incident on the connecting surface 45 is irradiated so as to be directed downward, so that the generation of glare light can be suppressed.
As described above, the main light distribution, which is a good low beam light distribution pattern having an oblique cut-off pattern, can be formed by the configuration.

By the way, in this embodiment, since it forms using the shade 50 in order to form the main light distribution which has a diagonal cut-off pattern, the light from the light source 20 will be in the lower part of the 1st lens 40. FIG. There is a part that is not incident.
That is, the description so far has described the incident surface, the exit surface, and the like of the lens portion (see the main lens portion 40A in FIG. 2) where the light from the light source 20 enters without being blocked by the shade 50.

  However, since there is a portion below the first lens 40 where light is not incident and is not used for forming the main light distribution, the unused portion can be used effectively for signs, signs, etc. It is possible to form a light distribution pattern that irradiates upward, such as an overhead light distribution that irradiates light.

  In such a case, it is possible to form a light distribution pattern such as an overhead light distribution that irradiates above the main light distribution with only one lamp unit without using another lamp unit.

  In the following description, the lower part of the first lens 40 that is not used for the formation of the main light distribution, that is, the sub-lens part 40B shown in FIG. The configuration for forming the pattern will be described in detail.

  In the above description, the case of a low beam light distribution pattern having an oblique cut-off line as the main light distribution has been described. However, depending on the region, the oblique light cut-off line may not be provided in the cut-off line. It should be noted that the detailed configuration for forming is an example.

  In the case of a low beam light distribution pattern that does not have an oblique cut-off line, the shape of the upper side 51 of the shade 50 is matched with the cut-off line shape of the low beam light distribution pattern, and the main lens portion of the first lens 40 What is necessary is just to adjust the shape of the output surface of 40A (refer FIG. 2).

  Therefore, even when the low light beam distribution pattern different from the low beam distribution pattern having the oblique cutoff line described above in detail is used as the main light distribution, a predetermined cutoff line is formed using the shade 50, and the first lens 40 is used. The main light distribution (predetermined low beam light distribution pattern) is formed by the main lens portion 40A.

  However, the shape of the upper side 51 of the shade 50 and the portion of the main lens portion 40A of the first lens 40 are appropriately adjusted according to the desired main light distribution (low beam light distribution pattern). It should be noted that the shape of the upper side 51 and the specific shapes such as the entrance surface and the exit surface of the main lens portion 40A of the first lens 40 are not limited to those described in detail above.

(Formation of a light distribution pattern to be irradiated above the main light distribution)
First, referring to FIG. 17, the region to be the sub-lens portion 40 </ b> B in the first lens 40 will be described.

FIG. 17 is a diagram for explaining a region to be the sub-lens portion 40 </ b> B, and illustrates only the first lens 40, the shade 50, and the light emitting chip 21 of the light source 20.
In FIG. 17, the Z-axis and the Y-axis are the same as the previous figures, and the illustration of the X-axis is omitted because it overlaps the intersection of the Z-axis and the Y-axis.

  As shown in FIG. 17, an arrow T <b> 4 that is a straight line connecting the upper end of the light emitting chip 21 and the basic focal point PF of the first lens 40 (which is also the reference point CP of the shade 50) intersects the incident surface 42 of the first lens 40. Light from the light source 20 is blocked by the shade 50 on the incident surface 42 below the position and basically does not enter.

  The straight line indicated by the arrow T4 is a straight line having an angle γ in the vertical direction with respect to the light source optical axis Z with the basic focus PF of the first lens 40 (also the reference point CP of the shade 50) as the origin. In this embodiment, the angle γ is about 30 degrees.

  Accordingly, the lower entrance surface of the first lens 40 having a basic focal point PF of the first lens 40 (which is also the reference point CP of the shade 50) as an origin and a vertical angle of about 30 degrees or more with respect to the light source optical axis Z. The portion corresponding to 42 is used as the sub lens portion 40B, and the sub lens portion 40B is used to form a light distribution pattern that irradiates the upper side of the main light distribution, such as overhead light distribution. It is possible to form a light distribution pattern that irradiates the upper side of the main light distribution without affecting the main light distribution.

Hereinafter, more specifically, a configuration for forming a light distribution pattern to be irradiated above the main light distribution such as overhead light distribution will be described.
As shown in FIG. 2, an opening 52 is formed in the shade 50 so that the light from the light source 20 is incident on the sub-lens portion 40 </ b> B.

FIG. 18 is a view of the shade 50 as viewed from the light source 20 side.
Also in FIG. 18, the Y axis and the X axis are the same as before, and the light source optical axis Z is not shown because it overlaps the intersection of the Y axis and the X axis.
FIG. 18 schematically shows the position of the light emitting chip 21.

As shown in FIG. 18, the opening 52 formed in the shade 50 is such that the upper side 52a of the opening 52 is on the lower side from the left and right center side of the shade 50 (position where the light source optical axis Z is positioned in the left and right direction). In this embodiment, the opening 52 is a substantially arcuate upper side 52a which is a partial arc shape when a circle is approximated by a regular decagon.
The bottom 52b of the opening 52 has a shape that connects the left and right ends of the upper side 52a with straight lines, and the opening 52 has a substantially crescent shape.

The light from the light source 20 (light emitting chip 21) that passes through the opening 52 is light that is obliquely irradiated from the light source 20 (light emitting chip 21) as the light passes through the left and right outer sides of the opening 52. If a straight line is used, the light passing through the left and right outer sides of the opening 52 is incident on the upper side of the first lens 40.
If it does so, the light which passed the left-right outer side of the opening 52 may be irradiated above the sub lens part 40B, and may inject into the main lens part 40A.

  In order to avoid this, it is possible to position the position where the opening 52 is formed on the lower side in the vertical direction. As a result, it is difficult to secure a sufficient amount of light for forming a light distribution pattern.

  On the other hand, when the upper side 52a of the opening 52 is formed in an arc shape as in the present embodiment, the upper end of the light beam applied to the incident surface 42 of the first lens 40 is aligned in the vertical direction in the left-right direction. It can be a straight top.

  For this reason, even if the entire opening 52 is not formed so as to be positioned on the lower side, it is possible to prevent light from entering the main lens portion 40A. The amount of light for forming the light distribution pattern can be ensured.

  As will be described later in detail, as shown in FIGS. 2 and 18, the shade 50 is inclined downward at a predetermined angle from the upper side 52a of the opening 52 toward the first lens 40 side. A eaves 53 is provided.

  As described above, if the shape of the upper side 52a of the opening 52 is a polygon, when the opening 52 is formed, it is easy to provide a substantially strip-shaped uncut portion so that the eaves 53 can be formed by bending. Therefore, even from this point, it is preferable to form the upper side 52a of the opening 52 so as to have a polygonal and substantially arc shape.

  In addition, in the case where a part of the material portion that becomes the opening 52 is left and is molded by a mold or the like, the eaves 53 can be simultaneously molded while the upper side 52a is formed in a smooth arc shape that is not square. Therefore, the upper side 52a of the opening 52 is not necessarily polygonal and substantially arc-shaped.

FIG. 19 is a view showing a state in which light from the light source 20 (light emitting chip 21) passes through the opening 52 of the shade 50 and is irradiated to the sub lens unit 40B.
As described above with reference to FIG. 17, the extension line connecting the upper end of the light emitting chip 21 and the basic focal point PF of the first lens 40 (reference point CP of the shade 50) of the sub lens unit 40B is the first lens. It has been described that the lens is formed on the lower lens portion than the position where the 40 incident surface 42 intersects.

  On the other hand, as shown in FIG. 19, the position located on the uppermost side in the vertical direction of the upper side 52a of the opening 52 provided for irradiating light to the sub-lens portion 40B is the basic focal point PF (the reference point CP of the shade 50). ) About 0.9 mm below.

  For this reason, the light (see the light beam L2) irradiated so as to pass through the upper side of the opening 52 from the lower end of the light emitting chip 21 is incident on the uppermost side of the sub lens part 40B, but the light (see the light beam L2). However, the light is irradiated only below the boundary between the main lens portion 40A and the sub lens portion 40B.

  For this reason, the opening 52 is positioned at a position where light is not irradiated at the boundary between the main lens portion 40A and the sub lens portion 40B, and light is emitted at the step 47 at the boundary between the main lens portion 40A and the sub lens portion 40B. It is possible to avoid glare light from being reflected.

  Incidentally, the position of the light emitting chip 21 shown in FIG. 19 is the position of the design center. However, when the lamp unit 10 is actually assembled, the position of the light emitting chip 21 is slightly smaller than the position shown in FIG. A case of being located on the lower side is also conceivable.

  Then, the light traveling from the lower end of the light emitting chip 21 corresponding to the light beam L2 to the upper side of the opening 52 is incident on the incident surface 42 on the upper side of the first lens 40 if the eaves 53 are not provided. It will pass through the opening 52.

  However, as in the present embodiment, by providing the eaves 53 that are inclined downward at a predetermined angle from the opening 52 toward the first lens 40 side, such light is shielded, and the main lens portion 40A and the sub-lens are subtracted. It is possible to avoid the irradiation of light at the boundary of the lens unit 40B, and naturally, it is also possible to avoid the irradiation of light to the main lens unit 40A side.

In this embodiment, the eaves 53 are inclined by 35 ° downward when the width is about 2 mm and the light source optical axis Z is used as a reference.
If the inclination of the eaves 53 is further increased, an effect of suppressing the generation of glare light can be obtained even if the light emitting chip 21 is displaced by a corresponding amount. However, if the inclination of the eaves 53 is increased, the light passing through the opening 52 is reduced. Since the necessary light quantity cannot be obtained because the light is shielded, the angle of the eaves 53 is set to an appropriate inclination angle based on the positional deviation amount (assembly error) of the light emitting chip 21 allowed in the assembly process. It is preferable to determine the width, and the same applies to the width of the eaves 53.

In this embodiment, as can be seen from FIG. 18, the eaves 53 are located within a predetermined range based on the left and right center side of the upper side 52a of the opening 52, that is, from the left and right center to the left outer side along the upper side 52a. It is provided in a range of about 50% facing and a range of about 50% facing right outside along the upper side 52a from the left and right center.
However, the present invention is not limited to this, and the eaves 53 may be provided in a predetermined range considered necessary when the positional deviation of the light emitting chip 21 is taken into consideration.

Next, a configuration for light distribution control of the sub lens unit 40B will be described.
In the description of the configuration for the main light distribution, for example, as shown in FIG. 13, the lens portion 40 b of the first lens 40 positioned below the upper lens portion 40 a is the same as that of the first lens 40. Although it is illustrated up to the lowermost end, in reality, the range in which light can be incident in the state of the shade 50 not provided with the opening 52 is the lens portion 40b. As shown in FIG. 4, the boundary between the main lens portion 40A and the sub lens portion 40B is the lower end of the lens portion 40b, and the lens portion 40b is a lens portion located at the center when viewed from the first lens 40 as a whole. The lens unit 40A is a lower lens unit 40b, and a sub lens unit 40B is provided in a lower lens part of the lower lens unit 40b.

  A light distribution pattern such as an overhead light distribution that irradiates above the main light distribution is formed by utilizing the portion of the sub lens portion 40B. More specifically, the emission surface 41e of the sub lens portion 40B is used as the main lens. It is divided from the exit surface of the portion 40A so as to have a shape for forming a light distribution pattern such as overhead light distribution on a free-form surface.

  The exit surface 41e will be described in detail from now on. To make the following explanation easy to understand, the outline of the design of the exit surface 41e will be described. The exit surface 41e of the sub lens unit 40B is incident on the sub lens unit 40B. It has a basic shape that is a shape in which a light distribution image formed by light incident on the surface 42e (light distribution image after passing through the second lens 30) is enlarged in the horizontal and vertical directions.

  The light distribution pattern irradiated to the front side of the vehicle toward the upper side of the main light distribution has an inverted trapezoidal shape with respect to the emission surface 41e of the basic shape that expands the light distribution image in the horizontal and vertical directions. The shape of the emission surface 41e is adjusted, and the emission surface 41e thus adjusted is the emission surface 41e of the sub-lens portion 40B. This will be specifically described below along the flow of this general description.

First, a configuration for enlarging a light distribution image in the horizontal and vertical directions will be described with reference to FIGS. 20 and 21. FIG.
In order to enlarge the light distribution image in the left-right direction, the emission surface 41e has a focal position of the second lens 30 when viewed from the second lens 30 side with respect to the basic focal point SF of the second lens 30, from now on. As will be described with reference to FIG.

  Further, in order to enlarge the light distribution image in the vertical direction, the emission surface 41e is configured so that the focal position of the second lens 30 when viewed from the second lens 30 side is set to the basic focal point SF of the second lens 30 from now on. As described with reference to FIG. 21, it is formed so as to be displaced vertically.

  In the following, description will be made in the order of the configuration for enlarging the light distribution image in the left-right direction and the configuration for enlarging the light distribution image in the vertical direction.

(Enlargement of the light distribution image in the horizontal direction)
FIG. 20 is a diagram for explaining how the focal position of the second lens 30 is shifted when the emission surface 41e is viewed from the second lens 30 side in order to enlarge the light distribution image in the left-right direction. 20A is a view of the main range of the incident surface 42 of the first lens 40 as viewed from the light source 20 side, and FIG. 20B is shown so that the shift of the focal position can be easily understood. It is a figure.

  In FIG. 20 (a), numerical values indicating the shift amount of the focal position are shown only for the portion corresponding to the incident surface 42e of the sub lens portion 40B, and the portion of the incident surface 42 above that is the main lens. This is the incident surface of the portion 40A, as described in the main light distribution configuration.

  In FIG. 20, the Z-axis, Y-axis, and X-axis are the same as before, and the unit of the numerical values in FIG. 20 (a) is mm. As shown in FIG. When viewed, the case where the focal position is shifted to the right side with respect to the basic focal point SF of the second lens 30 is represented by plus, and the case where it is displaced to the left side is represented by minus.

As shown in FIG. 20A, the numerical value on the left and right center side of the incident surface 42e of the sub lens portion 40B is 0 mm.
That is, when light is incident from the emission surface 31 of the second lens 30 toward the basic focal point SF side, the light emitted from the left and right center side of the incident surface 42e of the sub lens unit 40B toward the basic focal point SF side. Since the amount of deviation of the focal position is 0 mm, it matches the basic focal point SF.

  On the other hand, since the numerical value of the left outer incident surface 42e as viewed from the second lens 30 side, that is, the right incident surface 42e in FIG. 20A is +6 mm, it passes therethrough toward the basic focus SF side. As shown by a dotted arrow in FIG. 20B, the light emitted toward the right is a position shifted by 6 mm to the right side from the basic focus SF, that is, the left side from the basic focus SF when viewed from the second lens 30 side. The focal position is positioned 6 mm away from the center.

  Similarly, the numerical value of the right outer incident surface 42e as viewed from the second lens 30 side, that is, the left incident surface 42e in FIG. 20 (a) is −6 mm. As shown by a dotted arrow in FIG. 20B, the light emitted toward the focal point SF is 6 mm to the left of the basic focal point SF, that is, when viewed from the second lens 30 side, the basic focal point. The focal position is located 6 mm to the right of the SF.

Since the numerical value notation in FIG. 20 (a) is the same as before, the numerical value is changed so as to complement between the numerical values in the part where the numerical value is not described.
Therefore, when light is incident from the second lens 30 side, the light emitted from the incident surface 42e is irradiated to the left side with respect to the basic focal point SF of the second lens 30 from the left and right center side of the incident surface 42e toward the left side. That is, the focal position of the second lens 30 is shifted to the left with respect to the basic focal point SF of the second lens 30 toward the left side from the left and right center side of the incident surface 42e.

  Similarly, when light is incident from the second lens 30 side, the light emitted from the incident surface 42e is irradiated on the right side with respect to the basic focal point SF of the second lens 30 from the left and right center side of the incident surface 42e toward the right side. That is, the focal position of the second lens 30 is shifted to the right with respect to the basic focal point SF of the second lens 30 from the right and left center side of the incident surface 42e to the right side. Is realized by the shape of the exit surface 41e corresponding to the position of each entrance surface 42e.

  Therefore, the exit surface 41e of the secondary lens portion 40B is viewed from the second lens 30 side in order to enlarge the light distribution image formed by the light from the light source 20 incident on the entrance surface 42e of the secondary lens portion 40B in the left-right direction. The focal position of the second lens 30 is shifted to the left with respect to the basic focal point SF of the second lens 30 from the center of the left and right sides of the secondary lens portion 40B to the exit surface 41e corresponding to the left entrance surface 42e. The focal plane of the second lens 30 is shifted from the basic focal point SF of the second lens 30 to the right side from the center of the left and right sides of the lens portion 40B to the output plane 41e corresponding to the right incident plane 42e.

  FIG. 20B also shows the state of light beams (many light beams) emitted from the light source 20 (light emitting chip 21), but the light passes through the sub-lens portion 40B formed in this way. Further, after passing through the second lens 30, the light emitted from the right exit surface 31 of the second lens 30 is irradiated to the left side, and the light emitted from the left exit surface 31 of the second lens 30 is irradiated to the right side. As described above, the light distribution image is enlarged in the left-right direction by cross diffusion.

(Expansion of light distribution image in the vertical direction)
FIG. 21 is a diagram for explaining how the focal position of the second lens 30 is shifted when the emission surface 41e is viewed from the second lens 30 side in order to enlarge the light distribution image in the vertical direction. FIG. 21A is a view of the main range of the incident surface 42 of the first lens 40 as viewed from the light source 20 side, and FIG. 21B is shown for easy understanding of the shift of the focal position. It is a figure.

  FIG. 21A shows numerical values indicating the shift amount of the focal position only for the portion corresponding to the incident surface 42e of the sub-lens portion 40B, and the portion of the incident surface 42 above that is the main lens. This is the incident surface of the portion 40A, as described in the main light distribution configuration.

  Further, the incident surface 42e in FIG. 21A is the same as the incident surface 42e in FIG. 20A, and will be described below. In this portion, the state of the focal position when viewed in the vertical direction is shown. The state of the focal position shift in the left-right direction is as described with reference to FIG.

  In FIG. 21, the Z-axis, Y-axis, and X-axis are the same as before, and the unit of the numerical values in FIG. 21A is mm. As shown in FIG. A case where the focal position is shifted upward with respect to the 30 basic focal points SF is represented by plus, and a case where the focal position is displaced downward is represented by minus.

As shown in FIG. 21A, the numerical value on the lower side of the incident surface 42e of the sub lens part 40B is 0 mm.
That is, when light is incident from the exit surface 31 of the second lens 30 toward the basic focal point SF side, the focal point of the light emitted from the lower side of the incident surface 42e of the sub lens unit 40B toward the basic focal point SF side. Since the positional deviation amount is 0 mm, as shown by the dotted arrow in FIG. 21 (b), the light exiting to the basic focus SF side through that position is positioned at the basic focus SF. Yes.

  On the other hand, as shown in FIG. 21 (a), the numerical value of the upper incident surface 42e is −2 mm, and therefore the light emitted through the incident surface 42e toward the basic focal point SF is shown in FIG. 21 (b). As indicated by the dotted arrow, the focal position is positioned at a position shifted by 2 mm below the basic focal point SF.

Since the numerical value notation in FIG. 21A is the same as before, the numerical value is changed so as to complement between the numerical values in the portion where the numerical value is not described.
For this reason, when light is incident from the second lens 30 side, the light emitted from the incident surface 42e becomes lower with respect to the basic focal point SF of the second lens 30 as it goes from the lower side to the upper side of the incident surface 42e. In other words, the focal position of the second lens 30 is shifted downward with respect to the basic focal point of the second lens 30 from the lower side to the upper side of the incident surface 42e. The positional deviation is realized by the shape of the emission surface 41e corresponding to the position of each incident surface 42e.
The vertical relationship is the same whether viewed from the light source 20 side or the second lens 30 side as shown in FIG.

  Therefore, the exit surface 41e of the sub lens unit 40B is viewed from the second lens 30 side in order to enlarge the light distribution image formed by the light from the light source 20 incident on the entrance surface 42e of the sub lens unit 40B in the vertical direction. The second exit surface 41e corresponding to the upper incident surface 42e from the exit surface 41e corresponding to the lower entrance surface 42e to the exit surface 41e corresponding to the upper entrance surface 42e. The focal position of the lens 30 is formed to be shifted downward with respect to the basic focal point SF of the second lens 30.

  FIG. 21B also shows the state of light beams (many light beams) emitted from the light source 20 (light emitting chip 21), but the light passes through the sub-lens portion 40B formed in this way. Further, after passing through the second lens 30, it is irradiated above the main light distribution while expanding in the vertical direction, and as a result, the light distribution image is expanded in the vertical direction.

FIG. 22 is a diagram for explaining a light distribution pattern irradiated above the main light distribution formed as described above.
The light distribution image BOVH shown in FIG. 22 is in a state before the adjustment for shifting the focal position described above. By performing the adjustment for shifting the focal position, the light distribution image BOVH is enlarged horizontally and vertically. The light distribution pattern AOVH is obtained.

  However, since the light distribution pattern AOVH is in a state where the lower side and the upper side are curved, in order to obtain a more suitable light distribution pattern, the left and right outer sides on the upper side of the light distribution pattern are indicated by arrows as shown in FIG. In addition, the lower side of the light distribution pattern is expanded as indicated by an arrow, and the sub lens unit 40B is adjusted so as to be in a substantially inverted trapezoidal light distribution pattern ROVH.

Specifically, the light distribution pattern is adjusted to the inverted trapezoidal light distribution pattern ROVH by adjusting the focal position as before.
In the following, a configuration for shifting the focal position for obtaining the inverted trapezoidal light distribution pattern ROVH will be described in detail with reference to FIG.

  FIG. 23 shows the focal position of the second lens 30 when the emission surface 41e is viewed from the second lens 30 side in order to change the light distribution pattern AOVH shown in FIG. 22 into the inverted trapezoidal light distribution pattern ROVH. It is a figure for demonstrating how it is shifted, and is the figure which looked at the main range of the entrance plane 42 of the 1st lens 40 from the light source 20 side.

  In FIG. 23, the numerical value indicating the shift amount of the focal position is shown only for the portion corresponding to the incident surface 42e of the sub-lens portion 40B, and the portion of the incident surface 42 above that is the portion of the main lens portion 40A. This is the incident surface, as described in the main light distribution configuration.

Also in FIG. 23, the Y-axis and the X-axis are the same as before, and the Z-axis overlaps with the intersection of the Y-axis and the X-axis, so that illustration is omitted.
The unit of the numerical values shown in FIG. 23 is mm, and the case where the focal position is shifted to the front side, which is the first lens 40 side, with respect to the basic focus SF of the second lens 30 is represented by plus. The case where it deviates to the back side which leaves is expressed with minus.

  The portion corresponding to the lower side of the light distribution pattern AOVH shown in FIG. 22 is mainly formed by light incident on the lower side of the incident surface 42e of the sub-lens portion 40B, and the portion corresponding to the upper side of the light distribution pattern AOVH is The light that is incident on the upper side of the incident surface 42e of the sub lens part 40B is mainly formed.

When the focal position of the second lens 30 is shifted forward with respect to the basic focal point SF of the second lens 30, light is emitted downward, and conversely with respect to the basic focal point SF. When shifted backward, the light is irradiated upward.
The adjustment for shifting the focal position is realized by adjusting the shape of the emission surface 41e of the sub-lens portion 40B as before.

  Here, when the light distribution pattern AOVH shown in FIG. 22 is viewed, the lower side of the light distribution pattern AOVH is curved so that the left and right center side is located on the upper side and is lowered downward toward the left and right sides. By adjusting so that the light on the left and right center sides is lowered downward, the lower side of the light distribution pattern AOVH can be brought closer to the state of the straight lower side without curvature.

  Since the shift of the focal position and the change in the light irradiation direction are as described above, as shown in FIG. 23, when viewed from the second lens 30 side, the bottom of the left and right center of the sub lens portion 40B. The exit surface 41e corresponding to the incident surface 42e on the side may be shifted from the basic focal point SF of the second lens 30 to the front side on the first lens 40 side with respect to the basic focus SF of the second lens 30. Specifically, as indicated by a numerical value of +5 mm in FIG. 23, the focal position is shifted 5 mm forward from the basic focal point SF.

On the other hand, if light is irradiated upward on the upper side of the light distribution pattern AOVH shown in FIG. 22, it can be brought closer to the state of the upper side of the straight line without bending, and the lower side of the light distribution pattern AOVH and When the upper side is substantially linear, a light distribution pattern ROVH shown in FIG. 22 is obtained.
Note that the lower side can be made closer to a straight line by slightly lifting the left and right outer sides of the lower side of the light distribution pattern AOVH, that is, by slightly irradiating light on the left and right outer sides.

  For this reason, when viewed from the second lens 30 side, the lower entrance surface 42e (the +5 portion in FIG. 23) on the left and right center of the sub lens portion 40B is used as a reference, as shown in FIG. The focal position of the second lens 30 is shifted toward the rear side away from the first focal point 40 with respect to the basic focal point SF of the second lens 30 as the light exiting surface 41e corresponding to the incident surface 42e directed diagonally upward and laterally outward. To.

  Specifically, as shown in FIG. 23, the exit surface 41e corresponding to the upper side of the entrance surface 42e is −6 mm when viewed in the left-right direction, that is, the focal position of the second lens 30 is set to the second lens 30. It is formed so as to be shifted by 6 mm toward the rear side away from the first lens 40 with respect to the basic focal point SF.

  In this way, even if the amount of shift in the focal position is uniform, the light is emitted upward as it goes outward due to the distance from the light source 20, so when viewed in the light distribution pattern, the right and left outer sides of the light distribution pattern The upper side of the light distribution pattern becomes a straight line.

  On the other hand, since the lower side of the light distribution pattern is also adjusted to lower the left and right center sides, it is not necessary to adjust the left and right outer sides so much upward, so that the focal position of the second lens 30 is shown in FIG. Is shifted by 2 mm to the rear side away from the first lens with respect to the basic focal point SF of the second lens 30, and the exit surface 41e corresponding to the left and right outer entrance surfaces 42e is the upper and left and right oblique upper entrance surfaces. The amount of displacement is smaller than that of the exit surface 41e corresponding to 42e.

  FIG. 24 shows the light distribution pattern ROVH formed through the sub-lens portion 40B having a configuration for shifting the focal position of the second lens 30 as described above, and the light distribution pattern LP shown in FIG. It is a figure which shows the light distribution pattern on the screen which match | combined with the low beam light distribution pattern which has a cut-off line.

  As can be seen from FIG. 24, a good light distribution pattern ROVH that is a so-called overhead light distribution can be formed above the light distribution pattern LP that is the main light distribution.

  As described above, the present invention has been described based on the specific embodiments, but the present invention is not limited to the above-described embodiments, and has been modified or improved without departing from the technical idea. Are also included in the technical scope of the invention, which is apparent to the person skilled in the art from the scope of the claims.

DESCRIPTION OF SYMBOLS 10 Lamp unit 20 Light source 20 'Virtual light source 21 Light emitting chip 21a Light emitting surface 22 Aluminum mounting board 30 2nd lens 31 Outgoing surface 32 Incident surface 40 1st lens 40A Main lens part 40B Secondary lens part 40a Upper lens part 40b Lens part 41 Outgoing Surface 41c upper exit surface 41d exit surface 41e exit surface 42 entrance surface 42a upper entrance surface 42b lower entrance surface 42c upper entrance surface 42e entrance surface 45 connecting surface 47 step 50 shade 51 upper side 52 opening 52a upper side 52b bottom side 53 eaves C cone CP reference Point L1 Ray L2 Ray LC Light cone LO Ray LP Light distribution pattern MP Light distribution portion MP 'Light distribution portion PF First lens basic focus SF Second lens basic focus X Horizontal axis Y Vertical axis Z Light source optical axis BOVH Light distribution image AOVH Light distribution pattern ROVH Light distribution pattern 101 , Before for 101R vehicle headlamp 102 vehicle

Claims (6)

A semiconductor light source,
A second lens disposed in front of the light source;
When the virtual light source is disposed between the light source and the second lens, and the virtual light source is positioned at its basic focal point, the light cone from the virtual light source is connected to the basic focal point of the second lens and the second lens. In addition to being converted into a cone, the light from the virtual light source incident on the incident surface on the outer side in the horizontal direction is formed to be converted inward so as to be incident on the incident surface on the outer side in the horizontal direction of the second lens. A first lens,
A shade disposed between the first lens and the light source to form a cut-off line;
The first lens is
A main lens section for main light distribution;
A sub-lens portion for a light distribution pattern provided on the lower side of the main lens portion and irradiating above the main light distribution;
The vehicular lamp according to claim 1, wherein the shade has an opening that allows light from the light source to pass through the sub lens unit.   The opening is provided in the shade so as to be located at a position where light from the light source is not irradiated at a boundary between the main lens portion and the sub lens portion of the first lens. The vehicular lamp according to 1.   3. The vehicular lamp according to claim 1, wherein the opening is formed in a substantially arc shape in which an upper side of the opening is lowered downward from a left / right center side toward a left / right outer side. The shade has an eaves provided to be inclined downward at a predetermined angle from the upper side of the opening toward the first lens side,
The vehicular lamp according to any one of claims 1 to 3, wherein the eaves are provided in a predetermined range from the left and right center side of the upper side of the opening to the left and right sides.   The light exit pattern of the sub-lens portion is a light distribution pattern that illuminates the light distribution image formed by the light from the light source incident on the light entrance surface of the sub-lens portion in the left-right and up-down directions and is irradiated upward in the front of the vehicle. Is formed so that the focal position of the second lens is deviated from the basic focal point of the second lens when viewed from the second lens side so as to have an inverted trapezoidal shape. The vehicular lamp according to any one of claims 1 to 4. In order to enlarge the light distribution image formed by the light from the light source incident on the incident surface of the sub lens unit in the horizontal and vertical directions, the emission from the sub lens unit when viewed from the second lens side. The surface is
In the horizontal direction, the focal position of the second lens is shifted to the left with respect to the basic focal point of the second lens as the exit surface corresponding to the incident surface on the left side from the left-right center side of the sub-lens portion. The focal position of the second lens is shifted to the right with respect to the basic focal point of the second lens as the exit surface corresponding to the incident surface on the right side from the left and right center side of the lens unit,
In the vertical direction, the emission surface corresponding to the incident surface on the upper side from the emission surface corresponding to the incident surface on the lower side of the sub-lens portion toward the emission surface corresponding to the incident surface on the upper side is the first. The basic shape of the focal point of the two lenses is shifted downward with respect to the basic focal point of the second lens,
Further, with respect to the basic shape, the focal position of the second lens is set in the front-rear direction with respect to the basic focal point of the second lens so that the light distribution pattern irradiated upward in the front of the vehicle has an inverted trapezoidal shape. It is formed to slip,
The emission surface of the secondary lens portion is below the center of the left and right sides of the secondary lens portion when viewed from the second lens side so that the light distribution pattern irradiated upward in the front of the vehicle has an inverted trapezoidal shape. The exit surface corresponding to the incident surface on the side shifts the focal position of the second lens to the front side which is the first lens side with respect to the basic focus of the second lens, and the left and right center of the sub lens portion The focal position of the second lens with respect to the basic focal point of the second lens is closer to the exit surface corresponding to the entrance surface that is directed upward, laterally obliquely upward, and laterally outward with respect to the lower entrance surface. The rear surface away from the first lens is displaced, and the exit surface corresponding to the left and right outer entrance surfaces is displaced less than the exit surface corresponding to the upper and left and right oblique upper entrance surfaces. Characterized by being formed The vehicular lamp according to claim 5 that.

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