JP2015158986A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sure achromatic effect in a lens direct-projection type vehicular lighting fixture.SOLUTION: The lens direct-projection type vehicular lighting fixture includes a lens 2, and a semiconductor light source 3. The lens 2 is composed of an incident surface 20 and emission surfaces 21 to 25. The emission surfaces 21 to 25 are divided into emission surfaces 23U and 23D containing a reference light axis Z and emission surfaces 21, 22, 24, and 25 not containing the reference light axis Z. The emission surfaces 23U and 23D containing the reference light axis Z are divided into upper sections and lower sections by a stepped face 230 passing the reference light axis Z or an adjacent section thereof. Accordingly, the lens direct-projection type vehicular lighting fixture can obtain the sure achromatic effect.

Description

  The present invention relates to a lens direct illumination type vehicle lamp that makes light (direct light) from a semiconductor light source incident on a lens and irradiates the lens as a predetermined light distribution pattern.

  Conventionally, this type of lens direct-lighting vehicle lamp is known (for example, Patent Document 1). Hereinafter, a conventional vehicle lamp will be described. A conventional vehicular lamp includes a light emitting element and a projection lens. By causing the light emitting element to emit light, a predetermined light distribution pattern is irradiated from the exit surface of the projection lens. In such a direct lens type vehicle lamp, it is important to suppress the appearance of a color band due to a lens spectral phenomenon (lens chromatic aberration phenomenon) in the light distribution pattern, that is, to obtain an achromatic effect.

  Conventionally, a vehicular lamp having an achromatic effect has been available (for example, Patent Document 2 and Patent Document 3). Hereinafter, a conventional vehicular lamp having an achromatic effect will be described. The vehicle lamp of Patent Document 2 is a projector type, not a direct lens type, and the upper half of the projection lens is made of a material with a large refractive index, and the lower half of the projection lens is made of a material with a small refractive index. It is. Light is refracted from the upper half of the projection lens and refracted more than the refraction of light emitted from the lower half of the projection lens. Thereby, the spectral color of the light irradiated from the upper half of the projection lens and the spectral color of the light irradiated from the lower half of the projection lens cancel each other, and an achromatic effect is obtained.

  Similarly, the vehicular lamp of Patent Document 3 is a projector type, not a direct lens type, and is configured such that red light is emitted in the horizontal direction at the upper part of the convex lens, and blue light is provided in the horizontal direction at the lower part of the convex lens. It is constituted so as to emit light. The horizontal red light and the downward blue light emitted from the upper part of the convex lens cancel the horizontal blue light and the downward red light emitted from the lower part of the convex lens to obtain an achromatic effect. .

JP2011-228196A JP 2009-181845 A Japanese Patent Laid-Open No. 1-186701

  However, since the vehicular lamp of Patent Document 2 and the vehicular lamp of Patent Document 3 are projector-type rather than direct-lens-type, a reliable achromatic effect can be obtained when applied to a direct-lens-type vehicular lamp. It may not be possible.

  The problem to be solved by the present invention is that a certain achromatic effect can be obtained in a lens direct-lighting vehicle lamp.

  The present invention (the invention according to claim 1) includes a lens and a semiconductor-type light source, and the lens is composed of an incident surface and an exit surface, and the exit surface has a reference optical axis of the lens. A portion including the reference optical axis, and an exit surface of the portion including the reference optical axis is vertically divided into two by a step surface passing through the reference optical axis or the vicinity thereof. It is characterized by that.

  In the present invention (the invention according to claim 2), the light emitting surface image of the semiconductor-type light source irradiated from the stepped surface side portion of the upper emitting surface and the stepped surface side portion of the lower emitting surface are irradiated. The light emitting surface image of the semiconductor type light source is light distribution controlled so as to overlap each other, and the light emitting surface image of the semiconductor type light source irradiated from the portion away from the step surface of the upper emission surface, In addition, the light distribution is controlled so that the light emitting surface image of the semiconductor-type light source irradiated from the portion of the lower emission surface away from the step surface is positioned on the lower side as the distance from the step surface increases. It is characterized by.

  The present invention (the invention according to claim 3) is characterized in that the exit surface of the portion including the reference optical axis irradiates a light distribution pattern having an oblique cut-off line.

  The present invention (the invention according to claim 4) is characterized in that the lower emission surface is located closer to the light emission direction than the upper emission surface.

  In the vehicular lamp according to the present invention, the exit surface of the lens including the reference optical axis is divided into two vertically by a step surface passing through the reference optical axis or the vicinity thereof. For this purpose, a light emitting surface image (light distribution pattern) of the semiconductor light source irradiated from the upper light exit surface and a light emitting surface image (light distribution pattern) of the semiconductor light source irradiated from the lower light output surface The overlap can be adjusted. Thereby, the spectral color of the light emitting surface image irradiated from the upper output surface and the spectral color of the light emitting surface image irradiated from the lower output surface can be mixed and eliminated. As described above, the vehicular lamp according to the present invention provides a reliable achromatic effect in the lens direct-light vehicular lamp.

FIG. 1 is a front view showing a lamp unit (lens) showing an embodiment of a vehicular lamp according to the present invention. FIG. 2 is a perspective view illustrating a semiconductor light source. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an explanatory view showing a light emitting surface image irradiated from the upper exit surface. FIG. 5 is an explanatory view showing a light emitting surface image irradiated from the lower emission surface. FIG. 6 is an explanatory diagram showing a light distribution pattern formed by the first emission surface, the second emission surface, the third emission surface, the fourth emission surface, the fifth emission surface, and the auxiliary lens portion. FIG. 7 is an explanatory diagram showing a low beam light distribution pattern and an overhead sign light distribution pattern. FIG. 8 is a partial cross-sectional view (a partial cross-sectional view corresponding to FIG. 3) showing a lens in which the exit surface including the reference optical axis is not divided into two vertically. FIG. 9 is an explanatory diagram showing a light emitting surface image irradiated from the exit surface of the portion including the reference optical axis of the lens of FIG.

  DESCRIPTION OF EMBODIMENTS Embodiments (examples) of a vehicular lamp according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In FIG. 4 to FIG. 7 and FIG. 9, reference sign “VU-VD” indicates vertical lines on the top and bottom of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. In this specification and the appended claims, front, rear, upper, lower, left, and right are front, rear, upper, lower, left, and right when the vehicular lamp according to the present invention is mounted on a vehicle. It is. In the cross-sectional views of the lenses in FIGS. 3 and 8, hatching is omitted to clarify the optical path.

(Description of Configuration of Embodiment)
Hereinafter, with reference to FIGS. 1-7, the structure of the vehicle lamp concerning this embodiment is demonstrated. In the figure, reference numerals 1L and 1R denote vehicle lamps (for example, a vehicle headlamp, a low beam headlamp, etc.) according to this embodiment. The vehicular lamps 1L and 1R are mounted on both left and right ends of a front portion of a vehicle (not shown). The vehicle lamps 1L and 1R are vehicle lamps for left-hand traffic. Therefore, the traveling lane side is the left side, and the opposite lane side is the right side.

(Explanation of lamp unit)
The vehicle lamps 1L and 1R include a lamp housing (not shown), a lamp lens (not shown), a lens 2, a semiconductor-type light source 3, a heat sink member (not shown), and a mounting member (not shown). (Such as a holder and a lens holder).

  The lens 2, the semiconductor-type light source 3, the heat sink member, and the mounting member constitute a lamp unit. The lamp housing and the lamp lens define a lamp chamber (not shown). The lamp unit is disposed in the lamp chamber and is attached to the lamp housing via a vertical optical axis adjustment mechanism (not shown) and a horizontal optical axis adjustment mechanism (not shown). ing. In the lamp chamber, lamp units other than the lamp unit, for example, fog lamps, high beam headlamps, low / high headlamps, turn signal lamps, clearance lamps, daytime running lamps, cornering lamps, and the like are arranged. There is a case.

(Description of the semiconductor-type light source 3)
As shown in FIGS. 1 to 3, the semiconductor light source 3 is a self-luminous semiconductor light source such as an LED, an OEL, or an OLED (organic EL) in this example. The semiconductor-type light source 3 includes a package (LED package) in which a light emitting chip (LED chip) 30 is sealed with a sealing resin member. The package is mounted on a substrate (not shown). A current from a power source (battery) is supplied to the light emitting chip 30 via a connector (not shown) attached to the substrate. The semiconductor-type light source 3 is attached to the heat sink member.

  The light emitting chip 30 has a planar rectangular shape (planar rectangular shape). That is, four square chips are arranged in the X-axis direction (horizontal direction). Note that two, three, or five or more square chips, a plurality of rectangular chips, one rectangular chip, or one square chip may be used. Front surface of the light emitting chip 30 In this example, the rectangular front surface forms the light emitting surface 31. The light emitting surface 31 faces the front side of the reference optical axis (reference optical axis of the vehicular lamps 1L, 1R) Z of the lens 2. The center O of the light emitting surface 31 of the light emitting chip 30 is located at or near the reference focal point F of the lens 2 and on or near the reference optical axis Z.

  In FIG. 2, X, Y, and Z constitute an orthogonal coordinate (XYZ orthogonal coordinate system). The X axis is a horizontal axis in the left-right direction that passes through the center O of the light emitting surface 31 of the light emitting chip 30, and in this embodiment, the left side is the + direction and the right side is the-direction. The Y axis is a vertical axis passing through the center O of the light emitting surface 31 of the light emitting chip 30. In this embodiment, the upper side is the + direction and the lower side is the-direction. Further, the Z axis is a normal line (perpendicular line) passing through the center O of the light emitting surface 31 of the light emitting chip 30, that is, an axis in the front-rear direction orthogonal to the X axis and the Y axis (the reference optical axis Z). In this embodiment, the front side is the + direction and the rear side is the-direction.

(Description of lens 2)
As shown in FIGS. 1 and 3, the lens 2 includes an incident surface 20 and outgoing surfaces 21, 22, 23 U, 23 D, 24, and 25 (hereinafter referred to as “exit surfaces 21 to 25”). And is composed of. The lens 2 is attached to the heat sink member via the attachment member so as to face the semiconductor light source 3. In this example, the center (not shown) of the lens 2 is located below the center O (the X axis and the reference optical axis Z) of the light emitting surface 31 of the light emitting chip 30. Note that the center of the lens 2 and the center O of the light emitting surface 31 of the light emitting chip 30 may coincide with each other, or the center of the lens 2 may be the center O of the light emitting surface 31 of the light emitting chip 30. However, it may be positioned above.

(Description of the incident surface 20)
The incident surface 20 is composed of a single surface. The incident surface 20 is a surface facing the semiconductor-type light source 3, and in this example, is continuously formed by a quadratic curved surface, a composite quadratic curved surface, or a free curved surface. The incident surface 20 allows light (direct light) from the semiconductor light source 3 to enter the lens 2.

(Description of exit surfaces 21 to 25)
The emission surfaces 21 to 25 are surfaces opposite to the surfaces facing the semiconductor light source 3, and in this example, are formed independently from a free-form surface, a composite quadric surface, or a quadric surface. The exit surfaces 21 to 25 emit light from the semiconductor-type light source 3 incident on the lens 2 from the entrance surface 20 to the outside (in front of the vehicle), with predetermined light distribution patterns P1, P2, P3, The light is emitted (irradiated) as P4, P5, and LP (see FIGS. 6 and 7).

  The emission surfaces 21 to 25 are divided into two horizontal division step surfaces (lateral dividing lines) 2U and 2D, and the upper emission surface 21 and the middle emission surfaces 22, 23U, 23D and 24 and the lower emission surface. It is divided into an emission surface 25. The exit surfaces 22, 23 U, 23 D, 24 in the middle are divided by the two vertical dividing step surfaces (longitudinal dividing lines) 2 L, 2 R to the left (traveling lane side) exit surface 24 and the center exit surface. 23U and 23D and the exit surface 22 on the right side (opposite lane side). The exit surfaces 21 to 25 are the exit surfaces 23U and 23D in the middle of the portion including the reference optical axis Z, the exit surface 21 in the upper portion not including the reference optical axis Z, and the middle steps on both the left and right sides. The emission surfaces 22 and 24 and the lower emission surface 25 are divided.

  The upper emission surface 21 is recessed rearward from the middle emission surfaces 22, 23 U, 23 D, and 24. The middle emission surfaces 22, 23 U, 23 D, and 24 are recessed rearward from the lower emission surface 25. The center exit surfaces 23U and 23D in the middle are recessed rearward from the exit surfaces 22 and 24 in the middle on both the left and right sides.

  The upper emission surface 21 emits a first light distribution pattern P1 (see FIG. 6A) as a diffused light distribution pattern that is bilaterally or substantially bilaterally symmetric with respect to the vertical line VU-VD above and below the screen. To do.

  The right exit surface 22 on the right side irradiates a second light distribution pattern P2 (see FIG. 6B) as a diffused light distribution pattern having the lower horizontal cut-off line CL1 on the right side.

  The light emitting surfaces 23U and 23D in the middle middle stage have a third light distribution pattern P3 (a light collecting light distribution pattern P3 (having a lower horizontal cut-off line CL1 on the right side, an oblique cut-off line CL2 on the center, and an upper horizontal cut-off line CL3 on the left side). (See FIG. 6C).

  The left exit surface 24 on the left side irradiates a fourth light distribution pattern P4 (see FIG. 6D) as a diffuse light distribution pattern having an upper horizontal cut-off line CL3 on the left side.

  The lower emission surface 25 emits a fifth light distribution pattern P5 (see FIG. 6E) as a diffused light distribution pattern that is bilaterally symmetric or substantially bilaterally symmetric with respect to the vertical line VU-VD above and below the screen. To do.

  By combining (superimposing) the first light distribution pattern P1, the second light distribution pattern P2, the third light distribution pattern P3, the fourth light distribution pattern P4, and the fifth light distribution pattern P5, a low beam A light distribution pattern LP (see FIGS. 7A and 7B) is obtained.

(Description of the exit surfaces 23U and 23D of the portion including the reference optical axis Z)
The exit surfaces (the center exit surfaces) 23U and 23D including the reference optical axis Z are vertically divided into two by a step surface 230 passing through the reference optical axis Z or its vicinity. The lower emission surface 23D is positioned closer to the light emission direction than the upper emission surface 23U. That is, the upper emission surface 23U is recessed rearward from the lower emission surface 23D.

  A light emitting surface image I3U (see FIG. 4) formed by the emitted light L3U (see FIG. 3) emitted from the stepped surface 230 side portion of the upper emitting surface 23U, and the lower emitting surface 23D. Of these, the light emission surface images I1D (see FIG. 5) formed by the emitted light L1D (see FIG. 3) emitted from the portion on the stepped surface 230 side are respectively controlled in light distribution so as to overlap each other.

  Light emitting surface images I2U and I1U (see FIG. 4) formed by the emitted light L2U and L1U (see FIG. 3) irradiated from a portion away from the step surface 230 in the upper emitting surface 23U, and the lower side The light emitting surface images I2D and I3D (see FIG. 5) formed by the emitted light L2D and L3D (see FIG. 3) emitted from the part of the exit surface 23D away from the step surface 230 are the step surface 230. The light distribution is controlled so as to be positioned on the lower side as the distance from the camera increases.

(Description of light emission control of light emitting surface image)
The light distribution control of the light emitting surface images I1U, I2U, I3U, I1D, I2D, and I3D will be described below with reference to FIGS.

  The light emitting surface image I3U has an upper edge located at or near the upper horizontal cutoff line CL3, and an upper right corner located at the intersection or the vicinity of the upper horizontal cutoff line CL3 and the oblique cutoff line CL2. The light distribution is controlled. The light emission surface image I2U is light-distributed so that the upper right corner is positioned at or near the oblique cutoff line CL2. The light emitting surface image I1U has an upper edge located at an extension line of the lower horizontal cutoff line CL1 or in the vicinity thereof, and an upper right corner at an intersection or the vicinity of the lower horizontal cutoff line CL1 and the oblique cutoff line CL2. The light distribution is controlled so as to be positioned.

  Regarding the thickness of the lens 2, the thickness of the portion including the reference optical axis Z of the upper exit surface 23U is thick, and the thickness of the portion away from the reference optical axis Z of the upper exit surface 23U is thin. Therefore, due to the spectral phenomenon of the lens 2 (the chromatic aberration phenomenon of the lens 2), the emitted lights L1U, L2U, and L3U emitted from the upper emission surface 23U are slightly red on the upper side and on the lower side. It is split into slightly blue light. As a result, a slightly red spectrum R exists on the upper edges of the light emitting surface images I3U, I2U, and I1U. Note that a part of the left side of the upper edge of the light emitting surface images I2U and I1U overlaps the light emitting surface images I3U and I2U, respectively, so that the slightly red spectrum R disappears.

  The light emitting surface image I1D has an upper edge located at the upper horizontal cut-off line CL3 or the vicinity thereof, and an upper right corner located at an intersection or the vicinity of the upper horizontal cut-off line CL3 and the oblique cut-off line CL2. The light distribution is controlled. The light emitting surface image I2D is light-distributed so that the upper right corner is positioned at or near the oblique cutoff line CL2. The light emitting surface image I3D has an upper edge located at an extension line of the lower horizontal cutoff line CL1 or in the vicinity thereof, and an upper right corner at an intersection or the vicinity of the lower horizontal cutoff line CL1 and the oblique cutoff line CL2. The light distribution is controlled so as to be positioned.

  Regarding the thickness of the lens 2, the thickness of the lower portion of the exit surface 23D including the reference optical axis Z is thick, and the thickness of the portion of the lower exit surface 23D away from the reference optical axis Z is thin. . Therefore, due to the spectral phenomenon of the lens 2 (the chromatic aberration phenomenon of the lens 2), the emitted lights L1D, L2D, and L3D emitted from the lower emission surface 23D are slightly blue and lower on the upper side. It is split into slightly red light. As a result, a slightly blue spectrum B exists at the upper edges of the light emitting surface images I1D, I2D, and I3D. Note that a part of the left side of the upper edge of the light emitting surface images I2D and I3D overlaps with the light emitting surface images I1D and I2D, respectively, so that the slightly blue spectrum B disappears.

(Explanation of outgoing light, light emitting surface image, light distribution pattern)
In this example, the emitted lights L1U, L2U, L3U, L1D, L2D, and L3D shown in FIG. 3 are longitudinal sections of the emission surfaces (the emission surfaces in the middle middle stage) 23U and 23D of the portion including the reference optical axis Z. It is the light emitted (irradiated) to the outside from an arbitrary point on the surface (III-III line cross section in FIG. 1). In this example, the light emitting surface images I1U, I2U, I3U, I1D, I2D, and I3D shown in FIGS. It is a statue.

  From the entire surfaces of the exit surfaces 23U and 23D including the reference optical axis Z, the light distribution is controlled in the same manner as the exit lights L1U, L2U, L3U, L1D, L2D, and L3D shown in FIG. Irradiation light (not shown) is emitted to the outside. By the emitted light emitted from the entire surface of the emission surfaces 23U and 23D including the reference optical axis Z, the light emitting surface images I1U, I2U, I3U, I1D, I2D, and I3D shown in FIGS. Similarly, light emitting surface images (not shown) are formed. The third light distribution pattern P3 shown in FIG. 6C is formed by superimposing the light emitting surface images.

  Light distribution patterns other than the third light distribution pattern P3 (the first light distribution pattern P1, the second light distribution pattern P2, the fourth light distribution pattern P4, and the fifth light distribution pattern P5) are also illustrated. Similarly, the light emitting surface image formed by the light emitted from the entire surface of the upper exit surface 21, the left and right middle exit surfaces 22, 24, and the lower exit surface 25 is overlapped. Is formed.

(Description of auxiliary lens unit 4)
An auxiliary lens unit 4 is integrally provided on the lower side of the lens 2. The auxiliary lens unit 4 includes an incident surface (not shown), a total reflection surface (not shown), and an exit surface 42. The auxiliary lens unit 4 receives light from the semiconductor light source 3 from the incident surface, totally reflects the incident light on the total reflection surface, and emits the total reflection light from the emission surface 42. The emitted light L6 is irradiated as an overhead sign light distribution pattern P6 shown in FIGS. 6 (F) and 7 (A).

  The overhead sign light distribution pattern P6 formed by the auxiliary lens unit 4 is an auxiliary light distribution pattern with respect to the main light distribution pattern of the low beam light distribution pattern LP formed by the lens 2.

(Description of flange part 5)
A flange portion 5 is integrally provided around the lens 2 and the auxiliary lens portion 4. The flange portion 5 is for attaching to the attachment member. The lens 2 and the auxiliary lens portion 4 are attached to the attachment member via the flange portion 5.

(Description of the operation of the embodiment)
The vehicular lamps 1L and 1R according to this embodiment are configured as described above, and the operation thereof will be described below.

  The semiconductor light source 3 is turned on. Then, most of the light from the light emitting surface 31 of the semiconductor light source 3 is refracted and incident into the lens 2 from one incident surface 20 of the lens 2. At this time, the light distribution of the incident light is controlled on the incident surface 20. The incident light is refracted and emitted from the six exit surfaces 21 to 25 of the lens 2 to the outside. At this time, the emitted light is subjected to light distribution control on the emission surfaces 21 to 25. The emitted light is irradiated in front of the vehicle as five light distribution patterns P1 to P5.

  That is, emitted light is emitted from the upper emission surface 21 and is emitted to the front of the vehicle as the first light distribution pattern P1 shown in FIG. Outgoing light is emitted from the middle exit surface 22 on the right side and applied to the front of the vehicle as a second light distribution pattern P2 having a lower horizontal cut-off line CL1 shown in FIG. 6B. Outgoing lights L1U, L2U, L3U, L1D, L2D, and L3D (see FIG. 3) are emitted from the upper middle emitting surface 23U and the lower emitting surface 23D in the middle, and are shown in FIG. 6C. A third light distribution pattern P3 having a cut-off line CL1, an oblique cut-off line CL2, and an upper horizontal cut-off line CL3 is irradiated in front of the vehicle. Outgoing light is emitted from the left middle output surface 24 and is emitted to the front of the vehicle as a fourth light distribution pattern P4 having an upper horizontal cutoff line CL3 shown in FIG. 6D. Outgoing light is emitted from the lower emission surface 25 and is emitted to the front of the vehicle as a fifth light distribution pattern P5 shown in FIG. 6 (E).

  By superimposing the five light distribution patterns P1 to P5, a low beam light distribution having a lower horizontal cut-off line CL1, an oblique cut-off line CL2, and an upper horizontal cut-off line CL3 shown in FIGS. 7A and 7B. A pattern LP is formed. Here, the upper edges of the first light distribution pattern P1 and the fifth light distribution pattern P5 are located slightly below the lower horizontal cutoff line CL1, the oblique cutoff line CL2, and the upper horizontal cutoff line CL3.

  On the other hand, part of the light from the semiconductor light source 3 is refracted and incident from the incident surface of the auxiliary lens unit 4 into the auxiliary lens unit 4. At this time, incident light is subjected to light distribution control on the incident surface. The incident light is totally reflected by the total reflection surface of the auxiliary lens unit 4. At this time, the total reflection light is subjected to light distribution control on the reflection surface. The totally reflected light is refracted and emitted from the emission surface 42 of the auxiliary lens unit 4 to the outside. At this time, the emitted light is subjected to light distribution control on the emission surface 42. The emitted light is irradiated on the front upper side of the vehicle as an overhead sign light distribution pattern P6 shown in FIGS. 6 (F) and 7 (A).

(Explanation of effect of embodiment)
The vehicular lamps 1L and 1R according to this embodiment are configured and operated as described above, and the effects thereof will be described below.

  The vehicular lamps 1L and 1R according to this embodiment include stepped surfaces on which the exit surfaces 23U and 23D including the reference optical axis Z of the exit surfaces 21 to 25 of the lens 2 pass the reference optical axis Z or the vicinity thereof. 230 is divided into two vertically. For this purpose, the light emitting surface images I3U, I2U, and I1U (light distribution pattern) of the semiconductor light source 3 irradiated from the upper output surface 23U and the light emitting surface of the semiconductor light source 3 irradiated from the lower output surface 23D. The overlapping of the images I1D, I2D, and I3D (light distribution pattern) can be adjusted. Thereby, the spectral colors (slightly red) of the light emitting surface images I3U, I2U, and I1U irradiated from the upper emitting surface 23U and the spectral colors of the light emitting surface images I1D, I2D, and I3D irradiated from the lower emitting surface 23D. (Slightly blue) can be mixed and erased. As described above, the vehicular lamps 1L and 1R according to this embodiment can provide a reliable achromatic effect in the lens direct-light vehicular lamp.

  In particular, the vehicular lamps 1L and 1R according to this embodiment include a light emitting surface image I3U formed by the emitted light L3U emitted from a portion on the stepped surface 230 side of the upper emission surface 23U, and a lower emission surface. As shown in FIGS. 3 to 5, the light distribution is controlled so that the light emitting surface image I1D formed by the emitted light L1D irradiated from the portion on the step surface 230 side of 23D overlaps each other. . Further, the light emitting surface images I2U and I1U formed by the emitted light L2U and L1U irradiated from the part away from the step surface 230 in the upper exit surface 23U, and the step surface 230 among the lower exit surface 23D. As shown in FIGS. 3 to 5, the light emitting surface images I2D and I3D formed by the emitted lights L2D and L3D irradiated from the distant portions are arranged so as to be positioned downward as they move away from the step surface 230, respectively. Light controlled.

  For this reason, the vehicular lamps 1L and 1R according to this embodiment include the spectral colors (slightly red) existing at the upper edges of the light emitting surface images I3U, I2U and I1U and the upper edges of the light emitting surface images I1D, I2D and I3D. Since the spectral colors (slightly blue) existing in each other cancel each other, a more reliable achromatic effect can be obtained in the lens direct-lighting vehicle lamp.

  Here, among the exit surfaces of the lens, the exit light L1, L2, L3, L4, L5 in the lens composed of one exit surface 23 in which the exit surface 23 including the reference optical axis Z is not divided into two vertically. , L6 (hereinafter may be referred to as “emitted light L1 to L6”) and light emitting surface images I1, I2, I3, I4, I5, I6 (hereinafter may be referred to as “light emitting surface images I1 to I6”). Will be described with reference to FIGS.

  In such a lens, the light from the semiconductor-type light source 3 enters the lens from the incident surface 20 of the lens. The incident light is emitted as emitted light L1 to L6 (see FIG. 8) from the exit surface 23 of the lens to the outside. The light emitting surface images I1 to I6 formed by the emitted lights L1 to L6 are subjected to light distribution control continuously from top to bottom along the cut-off lines CL1, CL2, and CL3 as shown in FIG.

  That is, the light emitting surface image I1 formed by the emitted light L1 has an upper edge located at or near the upper horizontal cut-off line CL3 and an upper right corner at the intersection of the upper horizontal cut-off line CL3 and the oblique cut-off line CL2. Light distribution is controlled so as to be located in the vicinity. The light-emitting surface images I2, I3, and I4 formed by the emitted lights L2, L3, and L4 are subjected to light distribution control continuously from the top to the bottom so that the upper right corner is located at or near the oblique cutoff line CL2. Yes. The light emitting surface image I5 formed by the emitted light L5 has an upper edge located at or near the extension line of the lower horizontal cutoff line CL1, and an upper right corner at the intersection of the lower horizontal cutoff line CL1 and the oblique cutoff line CL2. Light distribution is controlled so as to be located in the vicinity thereof. Light distribution control is performed so that the light emitting surface image I6 formed by the emitted light L6 is positioned below the lower horizontal cut-off line CL1.

  The thickness of the lens is such that the portion including the reference optical axis Z of the exit surface 23 (the central portion of the exit surface 23) is thick, and the portion of the exit surface 23 away from the reference optical axis Z (the periphery of the exit surface 23). (Part) is thin. For this reason, due to the spectral phenomenon of the lens (the chromatic aberration phenomenon of the lens), the light beams L1 and L2 emitted from the upper part of the emission surface 23 are spectrally divided into slightly red light and slightly lower blue light. On the other hand, the light beams L6 and L5 emitted from the lower part of the emission surface 23 are split into blue light slightly above and light red slightly below. The outgoing lights L3 and L4 emitted from the portion including the reference optical axis Z of the outgoing surface 23 are not affected by the spectral phenomenon of the lens (the chromatic aberration phenomenon of the lens). Or the effect is small even if it receives.

  As a result, a slightly red spectrum R exists at the upper edges of the light emitting surface images I1 and I2. Note that a part of the left side of the upper edge of the light emitting surface image I2 overlaps with the light emitting surface image I1U, and therefore the red spectrum R is slightly lost. On the other hand, a slightly blue spectrum B exists at the upper edges of the light emitting surface images I6 and I5. Note that a part of the left side of the upper edge of the light emitting surface images I6 and I5 overlaps with the light emitting surface images I5, I4 and I3, respectively, so that the blue spectrum B is slightly lost.

  Thus, in such a lens, as shown in FIG. 9, a slightly red spectrum R is present in the upper horizontal cutoff line CL3, a slightly blue spectrum B is present in the lower horizontal cutoff line CL1, and a slightly red spectrum B is present in the oblique cutoff line CL2. The spectrum R and the slightly blue spectrum B appear and stand out.

  On the other hand, since the vehicular lamps 1L and 1R according to this embodiment divide the exit surfaces 23U and 23D of the lens 2 including the reference optical axis Z into two vertically by the step surface 230, the upper side The upper emission surface 23U is adjusted by adjusting the overlap between the emission surface images I3U, I2U, I1U irradiated from the emission surface 23U of the light emission and the emission surface images I1D, I2D, I3D irradiated from the lower emission surface 23D. The light emitting surface images I3U, I2U, and I1U irradiated from the spectral colors (slightly red) and the light emitting surface images I1D, I2D, and I3D irradiated from the lower emission surface 23D (slightly blue) are mixed. Can be erased together.

  Since the vehicular lamps 1L, 1R according to this embodiment are made of one material, they are easy to manufacture and inexpensive.

  Further, in the vehicular lamps 1L and 1R according to this embodiment, the exit surfaces 23U and 23D including the reference optical axis Z among the exit surfaces 21 to 25 of the lens 2 pass the reference optical axis Z or the vicinity thereof. The surface is divided into two vertically by the step surface 230. For this reason, the spectral colors of the strong light beams L1U, L2U, L3U, L1D, L2D, and L3D emitted from the exit surfaces 23U and 23D including the reference optical axis Z can be erased.

  Here, since the vehicular lamp of Patent Document 2 uses two materials having different refractive indexes as the projection lens, there are problems in manufacturing and cost. Since the vehicular lamp of Patent Document 3 cancels out the spectral color of weak light emitted from the upper part and the lower part of the convex lens, it is emitted from the central part of the convex lens (including the reference optical axis of the convex lens). There is a problem that it is impossible to cancel the spectral colors of the strong light that is generated.

  On the other hand, since the vehicle lamps 1L and 1R according to this embodiment are made of one material, manufacturing is simple and cost is low. In addition, the vehicular lamps 1L and 1R according to this embodiment can erase the spectral colors of the emitted light L1U, L2U, L3U, L1D, L2D, and L3D of strong light.

  In the vehicular lamps 1L and 1R according to this embodiment, the emission surfaces 23U and 23D including the reference optical axis Z irradiate the third light distribution pattern P3 having the oblique cutoff line CL2. The oblique cut-off line CL2 is a portion of the low beam light distribution pattern LP where the highest light intensity exists and the driver watches. For this reason, since the spectral color in the oblique cut-off line CL2 portion that the driver gazes at can be erased, the driver is not bothered by the spectral color and visibility is improved.

  In the vehicular lamps 1L and 1R according to this embodiment, the lower emission surface 23D is positioned closer to the light emission direction than the upper emission surface 23U. That is, the upper emission surface 23U is recessed rearward from the lower emission surface 23D. For this reason, the step surface 230 can be inclined from top to bottom from the upper exit surface 23U to the lower exit surface 23D. As a result, the light emitted from the step surface 230 is light-distributed by the step surface 230 inclined from top to bottom, and refracted downward with respect to the reference optical axis Z of the lens 2 to be emitted. Thereby, generation | occurrence | production of the junk light from the level | step difference surface 230 can be prevented reliably.

(Description of example other than embodiment)
In this embodiment, a vehicle headlamp and a low beam headlamp will be described. However, in the present invention, vehicle lamps other than vehicle headlamps and low beam headlamps such as fog lamps and high beam headlamps may be used.

  Further, in this embodiment, the part of the exit surface that does not include the reference optical axis Z is divided into four parts, the upper exit surface 21, the left and right middle exit surfaces 22, 24, and the lower exit surface 25. ing. However, in the present invention, the exit surface of the portion not including the reference optical axis Z may be divided into one to three, or five or more.

  Further, in this embodiment, the auxiliary lens portion 4 is provided on the lower side of the lens 2 to form the overhead sign light distribution pattern P6. However, in the present invention, an auxiliary lens portion may be provided around the lens 2 to form an auxiliary light distribution pattern other than the overhead sign light distribution pattern P6. Also, a plurality of auxiliary lens portions may be provided to form a plurality of auxiliary light distribution patterns. Further, the auxiliary lens part is not provided and the auxiliary light distribution pattern may not be formed.

1L, 1R Vehicle lamp 2 Lens 20 Entrance surface 21, 22, 23U, 23D, 24, 25 Exit surface 23 Exit surface 230 Stepped surface 3 Semiconductor type light source 30 Light emitting chip 31 Light emitting surface 4 Auxiliary lens portion 42 Exit surface 5 Flange portion B Light blue spectrum CL1 Lower horizontal cut-off line CL2 Oblique cut-off line CL3 Upper horizontal cut-off line F Reference focus HL-HR Horizontal horizontal lines I1U, I2U, I3U, I1D, I2D, I3D I4, I5, I6 Emitting surface image L1U, L2U, L3U, L1D, L2D, L3D Emission light L1, L2, L3, L4, L5, L6 Emission light LP Low beam distribution pattern O Center P1 First light distribution pattern P2 Light distribution pattern P3 Third light distribution pattern P4 Fourth light distribution pattern P5 Fifth Vertical line of a top and a bottom of the light pattern P6 overhead sign light distribution pattern R rather red spectral VU-VD screen X X axis Y Y axis Z reference optical axis (Z-axis)

Claims (4)

A lens and a semiconductor-type light source,
The lens is composed of an entrance surface and an exit surface,
The exit surface is formed from a portion including a reference optical axis of the lens and a portion not including the reference optical axis,
The exit surface of the portion including the reference optical axis is divided into two vertically by a step surface passing through the reference optical axis or the vicinity thereof.
A vehicular lamp characterized by the above. The light emitting surface image of the semiconductor-type light source irradiated from the stepped surface side portion of the upper emitting surface, and the semiconductor-type light source irradiated from the stepped surface side portion of the lower emitting surface. The light-emitting surface images are light distribution controlled so that they overlap each other.
A light emitting surface image of the semiconductor-type light source irradiated from a portion of the upper exit surface away from the step surface, and the semiconductor irradiated from a portion of the lower exit surface away from the step surface The light emission surface image of the mold light source is light distribution controlled so as to be positioned on the lower side as the distance from the step surface increases.
The vehicular lamp according to claim 1. The exit surface of the portion including the reference optical axis irradiates a light distribution pattern having an oblique cutoff line.
The vehicular lamp according to claim 1 or 2. The lower emission surface is positioned closer to the light emission direction than the upper emission surface.
The vehicular lamp according to any one of claims 1 to 3.

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