JP2018101561A - Vehicle headlight module - Google Patents

Abstract

A vehicular headlamp module capable of improving the degree of freedom of the shape of a design exit surface while suppressing chromatic aberration is provided. A vehicle headlamp module 10 emits a lens body 11 integrally formed with a plurality of types of translucent members 13 having different refractive indexes and a light beam L along the optical axis toward the lens body 11. The lens body 11 constitutes a boundary between the incident surface 14 for allowing the light beam L to enter the inside of the lens body 11 and another type of translucent member 13 inside the lens body 11. It has a boundary refracting surface 15 that refracts L, an internal reflecting surface 16 that internally reflects the light L, and a design emitting surface 17 that emits the light L toward the front of the vehicle. The light beam L is incident obliquely with respect to the normal line on one or both of the lines 17, and the light beam L is incident obliquely with respect to the normal line on the boundary refracting surface 15. [Selection] Figure 2

Description

  The present invention relates to a vehicle headlamp module.

  Conventionally, using two types of transparent resin members with different refractive index and dispersion rate, and using a projection lens that integrates a biconvex lens and a meniscus lens by two-color molding, coloring occurs in light distribution such as light and dark boundary lines. There has been proposed a projector-type vehicle headlamp module (see Patent Document 1 below). Also proposed is a vehicular headlamp module that uses a light guide member that controls incident refraction, internal reflection, and outgoing refraction to distribute light rays in the refracted light path downward and form a cut-off with light rays in the non-bent light path. (See Patent Document 2 below).

Japanese Patent No. 4863216 Japanese Patent No. 5445923

  In the projection lens of Patent Document 1, the exit surface is formed in a convex shape. In Patent Document 2, the exit surface is formed on a surface perpendicular to the front so as not to cause chromatic aberration. In the conventional vehicle headlamp module, when the exit surface is formed in various design shapes such as an inclined surface, chromatic aberration occurs, and the degree of freedom of the shape of the exit surface of the vehicle headlamp module is small.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle headlamp module that can improve the degree of freedom of the shape of the design exit surface while suppressing chromatic aberration.

  According to one embodiment of the vehicle headlamp module for achieving the above object, in the vehicle headlamp module that distributes light toward the front of the vehicle, a plurality of types of translucent members having different refractive indexes are integrated. A lens body formed; and a light source that emits a light beam along an optical axis toward the lens body. The lens body includes an incident surface that causes the light beam to enter the lens body; and the lens body. A boundary refracting surface that forms a boundary between the light-transmitting members of other types and refracts the light beam, an internal reflection surface that internally reflects the light beam, and a design emission that emits the light beam toward the front of the vehicle And the light ray is incident on one or both of the incident surface and the design exit surface obliquely with respect to the normal line, and the light ray is obliquely incident on the boundary refracting surface with respect to the normal line. Is incident on.

  According to the above-described configuration, the light beam is incident obliquely on the incident surface and the design emitting surface. That is, the entrance surface and the design exit surface can be freely arranged with respect to the incident direction of the light beam, and a vehicular lamp having a high design property can be realized. However, if light rays are incident obliquely on the entrance surface and the design exit surface, chromatic aberration occurs due to the difference in the refractive index of the wavelength of the light. On the other hand, according to the above-described configuration, the lens body has the boundary refracting surface on which the light ray enters obliquely. As a result, chromatic aberration can be reduced by adjusting the chromatic aberration caused by the oblique incidence of light on one or both of the entrance surface and the design exit surface by the boundary refracting surface. That is, according to the above-described configuration, by appropriately adjusting the incident angle of the boundary refracting surface according to the incident angles of the incident surface and the design exit surface, the design exit surface can have various shapes. It is possible to suppress chromatic aberration of light rays emitted from the emission surface. Therefore, it is possible to provide a vehicular headlamp module in which the degree of freedom of the shape of the design exit surface is improved while suppressing chromatic aberration.

  In the above vehicle headlamp module, the plurality of types of translucent members include a first translucent member and a second translucent member having different refractive indexes, and the first translucent member is The boundary refracting surface of the first light transmitting member and the second light transmitting member includes the incident surface, and causes the light incident from the incident surface to enter the second light transmitting member. The incident angle of the light beam on the incident surface and the first boundary according to a difference in refractive index between the first light-transmissive member and the refractive index of the second light-transmissive member. The incident angle of the light beam on the refracting surface may be different from each other.

  According to the above configuration, the incident angle of the light beam on the incident surface and the light beam on the first boundary refracting surface according to the difference between the refractive index of the first light transmissive member and the refractive index of the second light transmissive member. By appropriately varying the incident angle, it is possible to more effectively suppress the chromatic aberration of the light beam emitted from the design exit surface.

  In the above vehicle headlamp module, the plurality of types of translucent members include a first translucent member and a second translucent member having different refractive indexes, and the first translucent member is The boundary refracting surface of the first light transmissive member and the second light transmissive member includes the design emission surface, and the light beam that has passed through the second light transmissive member is transmitted to the first light transmissive member. A second boundary refracting surface that is incident on the translucent member; and depending on a difference between a refractive index of the first translucent member and a refractive index of the second translucent member, The incident angle and the incident angle of the light beam on the second boundary refracting surface may be different from each other.

  According to the above configuration, the incident angle of the light beam on the design exit surface and the light beam on the second boundary refracting surface according to the difference between the refractive index of the first light transmitting member and the refractive index of the second light transmitting member. By appropriately varying the incident angle of, the chromatic aberration of light emitted from the design exit surface can be more easily suppressed.

  In the above vehicle headlamp module, the plurality of types of translucent members include a first translucent member and a second translucent member having different refractive indexes, and the first translucent member is The boundary refracting surface between the first light transmitting member and the second light transmitting member includes the incident surface and the design light emitting surface, and the light beam incident from the incident surface is transmitted to the second light transmitting surface. A first boundary refracting surface that is incident on the member, and a second boundary refracting surface that causes the light beam that has passed through the inside of the second light transmissive member to be incident on the first light transmissive member. Good.

  According to the above-described configuration, the chromatic aberration can be adjusted a plurality of times by the plurality of boundary refracting surfaces between the entrance surface and the design exit surface, so that the chromatic aberration of the light emitted from the design exit surface can be more reliably suppressed. be able to.

In the above vehicle headlamp module, an incident angle of the light beam on the first boundary refracting surface may be different from an emission angle of the light beam on the second boundary refracting surface.
According to the above-described configuration, since the refraction angle at the first boundary refracting surface and the refraction angle at the second boundary refracting surface can be reliably made different, chromatic aberration can be reliably suppressed.

  In the above vehicle headlamp module, the refractive index of the first light transmissive member is larger than the refractive index of the second light transmissive member, and the incident angle of the light beam on the second boundary refracting surface is: It may be larger than the incident angle of the light beam on the first boundary refracting surface.

  According to the above configuration, since the refractive index of the first light transmissive member is larger than the refractive index of the second light transmissive member, the refractive angle at the second boundary refractive surface is larger than the refractive angle at the first boundary refractive surface. Is bigger. Therefore, the chromatic aberration can be more easily suppressed by adjusting the incident angle of the light beam with respect to the second interface refractive surface.

In the vehicle headlamp module, the design emission surface may be inclined with respect to the vertical direction of the vehicle.
According to the above-described configuration, it is possible to form a design emission surface that has a design that is inclined with respect to the vertical direction of the vehicle and that can suppress chromatic aberration.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle headlamp module which can improve the freedom degree of the shape of the design output surface, suppressing chromatic aberration can be provided.

1 is a perspective view of a vehicle headlamp module according to a first embodiment of the present invention. It is sectional drawing of the vehicle headlamp module shown in FIG. It is a perspective view of the headlight module for vehicles concerning a 2nd embodiment of the present invention. It is sectional drawing of the vehicle headlamp module shown in FIG. It is a perspective view of the headlight module for vehicles concerning a 3rd embodiment of the present invention. It is a perspective view of the vehicle headlamp module which concerns on 4th Embodiment of this invention. It is a figure which shows the result of an Example (a) The example of light distribution in the light of a wavelength of a typical value, (b) The example of light distribution in the light of wavelength 400nm, (c) The example of light distribution in the light of wavelength 700nm.

  Hereinafter, a vehicle headlamp module according to an embodiment of the present invention will be described with reference to the drawings. In the drawings used in the following description, in order to make the features easy to understand, portions that become features may be shown in an enlarged manner for convenience, and the dimensional ratios and the like of each component are not always the same as actual.

(First embodiment)
FIG. 1 is a perspective view of a vehicle headlamp module 10 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the vehicle headlamp module shown in FIG.

The vehicle headlamp module 10 is a vehicle headlamp module 10 that distributes light toward the front of the vehicle, and includes a lens body 11 and a light source 12.
The light source 12 includes various light emitting elements that emit visible light toward the lens body 11. The emitted light includes a light beam L along the optical axis. In addition, in this specification, the light ray L along an optical axis means the light ray located on an optical axis among the light rays infinitely emitted from the light source 12. FIG. The light beam L is a representative light beam having the highest luminance among the countless light beams. Therefore, the light beam L along the optical axis is emitted from the approximate center of the light source 12. The light beam L along the optical axis is a light beam in a substantially central wavelength band among light beams in a predetermined wavelength band refracted at different refraction angles.

  The lens body 11 is integrally formed of a first light transmissive member (high refractive index material) 13a and a second light transmissive member (low refractive index material) 13b having different refractive indexes. The refractive index of the first light transmitting member 13a is selected to be larger than the refractive index of the second light transmitting member 13b. For example, polycarbonate is used as the first light transmitting member 13a, and the second light transmitting member 13a is used. For example, methacrylic resin or the like is used as the member 13b. The lens body 11 can be formed by two-color molding of the first translucent member 13a and the second translucent member 13b.

  The lens body 11 includes an incident surface 14 that allows the light beam L from the light source 12 to enter the inside of the lens body 11, a boundary refracting surface 15 that refracts the light beam L that includes a boundary between different types of translucent members 13, and a light beam L. And a design emitting surface 17 that emits the reflected light beam L forward of the vehicle.

The incident surface 14 and the design exit surface 17 are configured by inclined surfaces on which the light beam L is incident obliquely with respect to the normal line. In the present embodiment, the incident angle α1 of the light beam L on the incident surface 14 and the outgoing angle β4 of the light beam L on the design outgoing surface 17 are different from each other. For this reason, in the case where the lens body is formed of one type of translucent member, chromatic aberration may occur. As will be described later, according to the present embodiment, the lens body 11 is formed by a plurality of types of translucent members 13, so that chromatic aberration can be suppressed.
The incident surface 14 is set in a direction in which as much light as possible from the light source 12 can be incident. The design emitting surface 17 is set according to the design of the vehicle headlamp.
On the other hand, the boundary refracting surface 15 is inclined such that the light beam L is incident at an angle appropriately adjusted with respect to the normal so as to suppress the chromatic aberration of the light beam L incident from the incident surface 14 and emitted from the design exit surface 17. It is composed of surfaces.

A concave portion having a substantially triangular cross section is provided between the incident surface 14 and the design emitting surface 17 of the first light transmitting member 13a, and the second light transmitting member 13b is accommodated and closely integrated. The boundary refracting surface 15 is configured by the second translucent member 13b being in close contact.
The lens body 11 of the present embodiment includes a first boundary refracting surface 15a that causes the light beam L incident from the incident surface 14 to enter the second light transmitting member 13b, and a light beam that has passed through the second light transmitting member 13b. And a second boundary refracting surface 15b for allowing L to enter the first light transmissive member 13a.
The first boundary refracting surface 15a and the second boundary refracting surface 15b are each formed of a smooth plane or curved surface, and are inclined so that the light beam L is incident obliquely at an angle appropriately adjusted with respect to the normal line. .

In such a lens body 11, the first boundary refraction surface 15a and the second boundary refraction are preferably eliminated so as to reduce the chromatic aberration of the light beam L incident from the incident surface 14 and emitted from the design exit surface 17. Each inclination angle of the surface 15b is adjusted.
The inclination angles of the first boundary refracting surface 15a and the second boundary refracting surface 15b are such that the incident angle α2 of the light beam L on the first boundary refracting surface 15a and the outgoing angle β3 of the light beam L on the second boundary refracting surface 15b. Should be different from each other.

In the present embodiment, the inclination angles of the first boundary refracting surface 15a and the second boundary refracting surface 15b can be adjusted as follows.
First, according to the difference in the refractive index of the first light transmitting member 13a and the refractive index of the second light transmitting member 13b, the incident angle α1 of the light beam L on the incident surface 14 and the light beam L on the first boundary refractive surface 15a. The incident angle α2 can be adjusted to be different from each other. For example, the incident angle α1 of the light beam L on the incident surface 14 may be adjusted to be larger than the incident angle α2 of the light beam L on the first boundary refractive surface 15a.

  In addition, the incident angle α3 of the light beam L on the second boundary refracting surface 15b and the light beam L on the design exit surface 17 according to the difference in the refractive index of the first light transmitting member 13a and the refractive index of the second light transmitting member 13b. Can be adjusted to be different from each other. For example, the incident angle α4 of the light beam L on the design emitting surface 17 may be adjusted to be smaller than the incident angle α3 of the light beam L on the second boundary refracting surface 15b.

  Further, the incident angle α2 of the light ray L on the first boundary refracting surface 15a and the second boundary refracting surface 15b are determined according to the difference in refractive index between the first light transmissive member 13a and the refractive index of the second light transmissive member 13b. Can be adjusted so as to be different from the incident angle α3 of the light beam L. For example, the incident angle α3 of the light beam L on the second boundary refractive surface 15b may be adjusted to be smaller than the incident angle α2 of the light beam L on the first boundary refractive surface 15a.

  In this way, by setting the inclination angles of the first boundary refracting surface 15a and the second boundary refracting surface 15b, it is possible to irradiate the design exit surface 17 with a light distribution pattern with reduced color separation. .

The internal reflection surface 16 is provided on a smooth surface formed on the second light transmissive member 13b so as to be inclined and opposed to the first boundary refracting surface 15a and the second boundary refracting surface 15b. The internal reflection surface 16 is provided at a position and an angle at which the light beam L incident from the first boundary refractive surface 15a can be reflected by the second boundary refractive surface 15b.
The internal reflection surface 16 can form a light distribution pattern irradiated from the vehicle headlamp module 10 in a desired shape by controlling the reflection of light incident from the incident surface 14.

In this embodiment, for example, the light distribution pattern is formed by setting the shape of the internal reflection surface 16 as follows.
First, the first intermediate wavefront of the light after passing through the first boundary refracting surface 15a is set with the spherical surface centered on the light source 12 as the input wavefront. Next, a second intermediate wavefront before passing through the second boundary refracting surface 15b from the light distribution pattern is set using a cylindrical curved surface with the vertical direction as an output wavefront. Based on the first intermediate wavefront and the second intermediate wavefront, the shape of the internal reflection surface 16 from which the second intermediate wavefront can be obtained from the first intermediate wavefront can be set.
The light distribution pattern having a cut-off can be irradiated from the design exit surface 17 by the internal reflection surface 16.

In such a vehicle headlamp module 10, the light emitted from the light source 12 is refracted and incident on the incident surface 14 of the first light transmissive member 13a, and the first light transmissive member 13a and the second light transmissive member 13a. It refracts and passes through the first boundary refracting surface 15a at the interface with the optical member 13b.
This light is reflected by the internal reflecting surface 16 of the second light transmitting member 13b toward the second boundary refracting surface 15b at the interface between the first light transmitting member 13a and the second light transmitting member 13b.
The reflected light is refracted and passes by the second boundary refracting surface 15b, refracted and emitted from the design emitting surface 17 of the first translucent member 13a, and a predetermined light distribution formed by the internal reflecting surface 16 The front can be illuminated with a pattern.

According to the vehicle headlamp module 10 as described above, the lens body 11 has the boundary refracting surface 15 on which the light beam L enters obliquely. Therefore, the chromatic aberration caused when the light beam L is incident obliquely on the entrance surface 14 and the design exit surface 17 can be changed by the boundary refracting surface 15.
Thus, the design exit surface 17 has various shapes by appropriately adjusting the entrance angles α2 and α3 of the boundary refracting surface 15 with respect to the entrance angles α1 and α4 of the entrance surface 14 and the design exit surface 17. However, it is possible to suppress the chromatic aberration of the light beam emitted from the design emission surface 17.
Accordingly, it is possible to improve the degree of freedom of the shape of the design exit surface 17 while suppressing chromatic aberration.
In the present embodiment, the light beam L is incident obliquely on both the entrance surface 14 and the design exit surface 17. However, the same effect can be obtained even when a light beam is obliquely incident on one of the entrance surface 14 and the design exit surface 17.

The vehicle headlamp module 10 includes a first boundary refracting surface 15a that causes the light L from the incident surface 14 to enter the second light transmissive member 13b, and a light beam that has passed through the second light transmissive member 13b. And a second boundary refracting surface 15b for allowing L to enter the first light transmissive member 13a.
Therefore, the chromatic aberration can be adjusted a plurality of times between the entrance surface 14 and the design exit surface 17 by the plurality of boundary refracting surfaces 15, and the chromatic aberration of the light emitted from the design exit surface 17 can be reliably suppressed.

Particularly, since the incident angle α2 of the light beam L on the first boundary refracting surface 15a and the outgoing angle β3 of the light beam L on the second boundary refracting surface 15b are different from each other, the refraction angle on the first boundary refracting surface 15a is different. And the refraction angle at the second boundary refracting surface 15b can be reliably made different.
That is, after entering the second boundary refractive surface 15b from the first boundary refractive surface 15a, the light enters the first boundary refractive surface 15a again from the second boundary refractive surface 15b. If the incident angle α2 of 15a and the exit angle β3 of the second boundary refracting surface 15b are the same, the refraction angle is also the same. Therefore, by making these different, it is possible to make the refraction angle different.
As a result, the chromatic aberration of the light beam emitted from the design emission surface 17 can be more reliably suppressed.

In this vehicle headlamp module 10, the refractive index of the first light transmissive member 13a is larger than the refractive index of the second light transmissive member 13b, and the incident angle α3 of the light beam L on the second boundary refracting surface 15b is the first. It is larger than the incident angle α2 of the light ray L at the boundary refracting surface 15a.
Therefore, it is easy to ensure a refraction angle at the second boundary refracting surface 15b larger than a refraction angle at the first boundary refracting surface 15a, and by adjusting the incident angle α3 of the light beam L with respect to the second boundary refracting surface 15b. The chromatic aberration can be suppressed more greatly.

  In the vehicle headlamp module 10, the incident angle α1 of the incident surface 14 and the first boundary refracting surface 15a are determined according to the difference in refractive index between the first light transmitting member 13a and the second light transmitting member 13b. If the incident angle α2 is appropriately changed, or the incident angle α4 of the design exit surface 17 and the incident angle α3 of the second boundary refracting surface 15b are appropriately changed, chromatic aberration can be more easily suppressed.

  In the vehicle headlamp module 10, a design emission surface 17 that can emit light L while suppressing chromatic aberration is provided to be inclined with respect to the vertical direction of the vehicle. Therefore, even if the design of the design emitting surface 17 is designed with an inclined surface, chromatic aberration can be suppressed, and the degree of freedom in designing the vehicle headlamp module can be reliably improved.

Next, a method for suppressing chromatic aberration in the lens body 11 shown in FIGS. 1 and 2 will be specifically described.
The entrance surface 14 and the design exit surface 17 of the lens body 11 are preset by being appropriately designed. In this example, the incident angle α1 of the light incident surface 14 along the optical axis from the light source 12 is set to 8.7 °. On the other hand, the design exit surface 17 is provided with an inclination of 42 ° with respect to the vertical direction, and the exit angle β4 of the light beam along the optical axis at the design exit surface 17 is set to 42 °.

A polycarbonate resin is employed as the first light transmissive member 13a, and a methacrylic resin is employed as the second light transmissive member 13b.
The refractive index of the polycarbonate resin is typically 1.586, 1.615 at a wavelength of 400 nm (blue), and 1.579 at a wavelength of 700 nm (red).
On the other hand, the refractive index of the methacrylic resin is 1.492 as a representative value, 1.505 at a wavelength of 400 nm, and 1.489 at a wavelength of 700 nm.

Under these conditions, chromatic aberration is suppressed as follows.
First, when the refraction angle at the incident surface 14 of the first light transmissive member 13a to which the light from the light source 12 strikes is calculated according to Snell's law, the incident angle α1 of the incident surface 14 is 8.7 °, and thus the emission angle β1. Is 5.505 ° at a wavelength of 700 nm and 5.384 ° at a wavelength of 400 nm. That is, light having a wavelength of 400 nm is refracted by 0.121 ° more.

  On the other hand, since a light beam is emitted forward from the design exit surface 17 without chromatic aberration, the light beam is incident on the design exit surface 17 from the front, and the refraction angle is calculated according to Snell's law. Then, since the exit angle β4 of the design exit surface 17 is 42 °, the incident angle α4 is 25.07 ° at a wavelength of 700 nm and 24.48 ° at a wavelength of 400 nm. That is, light having a wavelength of 400 nm is refracted by 0.59 ° more.

Then, the inclination angle of the first boundary refracting surface 15a with respect to the incident surface 14 is set so that the difference between the exit angle α2 of the first boundary refracting surface 15a and the difference between the incident angles α3 of the second boundary refracting surface 15b are equal. The inclination angle of the second boundary refracting surface 15b with respect to the design emitting surface 17 is calculated.
By this calculation, the difference between the refraction angles of the light rays generated on the entrance surface 14 and the design exit surface 17 is corrected by refraction at the first boundary refracting surface 15a and the second boundary refracting surface 15b.

At this time, the second boundary refracting surface 15b having a large incident angle α3 is largely corrected, and the first boundary refracting surface 15a having a small incident angle α2 takes in the light from the light source 12 as much as possible. It is good to calculate.
In this example, the inclination angle of the first boundary refractive surface 15a with respect to the incident surface 14 is 15 °, and the inclination angle of the second boundary refractive surface 15b with respect to the design outgoing surface 17 is 3 °.

Then, the incident angle α2 at the first boundary refracting surface 15a is 9.495 ° (= −5.505 + 15) at a wavelength of 700 nm from the refraction angle at the incident surface 14, and the light is emitted from the first boundary refracting surface 15a. The angle β2 is 10.073 °.
On the other hand, at a wavelength of 400 nm, the incident angle α2 at the first boundary refractive surface 15a is 9.616 (= −5.384 + 15) °, and the emission angle β2 at the first boundary refractive surface 15a is 10.325 °. It becomes.
Therefore, the difference in emission angle at the first boundary refracting surface 15a is 0.252 °.

Further, from the refraction angle at the design exit surface 17, at a wavelength of 700 nm, the exit angle β3 at the second boundary refraction surface 15b is 28.07 ° (= 25.07 + 3), and the incidence at the second boundary refraction surface 15b. The angle α3 is 29.927 °.
On the other hand, at a wavelength of 400 nm, the emission angle β3 at the second boundary refractive surface 15b is 27.48 (= 24.48 + 3) °, and the incident angle α3 at the second boundary refractive surface 15b is 29.675 °. Become.
Therefore, the difference in incident angle on the second boundary refracting surface 15b is 0.252 °.

  Therefore, the difference between the exit angle β2 of the first boundary refracting surface 15a is equal to the difference between the incident angle α2 of the second boundary refracting surface 15b, and the refraction angles of the light rays generated at the entrance surface 14 and the design exit surface 17 respectively. Chromatic aberration due to the difference is corrected by refraction at the first boundary refractive surface 15a and the second boundary refractive surface 15b.

(Second Embodiment)
FIG. 3 is a perspective view of the vehicle headlamp module 110 according to the second embodiment of the present invention, and FIG. 4 is a cross-sectional view of the vehicle headlamp module shown in FIG.
The vehicle headlamp module 110 according to the second embodiment differs from the first embodiment in the shape of the first light transmissive member 113a, the second light transmissive member 113b, and the lens body 111, and the light source 112 and the incident surface. The arrangement of 114 is different. The second light transmissive member 113b is provided with a first internal reflection surface 116a and a second internal reflection surface 116b.
Others are the same as in the first embodiment.

  In the vehicle headlamp module 110 of the second embodiment, the light emitted from the light source 112 is refracted and incident on the incident surface 114 of the first light transmissive member 113a. This light is refracted and passes through the first boundary refracting surface 115a at the interface between the first light transmissive member 113a and the second light transmissive member 113b, and the first internal reflection surface of the second light transmissive member 113b. The light is reflected by 116a, and the light is further reflected by the second internal reflection surface 116b of the second light transmitting member 113b. Thereafter, the light passes through the second boundary refracting surface 115b of the interface between the first light transmissive member 113a and the second light transmissive member 113b and is refracted from the design emission surface 117 of the second light transmissive member 113b. Are emitted. And it irradiates from the design exit surface 117 to the vehicle front side.

  Thus, even in the second embodiment in which the lens body 111 has the first internal reflection surface 116a and the second internal reflection surface 116b, the same operational effects as the first embodiment can be obtained, and chromatic aberration can be obtained. It is possible to improve the degree of freedom of the shape of the design exit surface 117 while suppressing the design.

(Third embodiment)
FIG. 5 is a perspective view of a vehicle headlamp module 210 according to the third embodiment of the present invention.
The vehicle headlamp module 210 according to the third embodiment includes a first light transmissive member 213a having an incident surface 214, and a second light transmissive member 213b having an internal reflection surface 216 and a design light emission surface 217. A lens body 211 integrated with one boundary refracting surface 215 is used.
Others are the same as in the first embodiment.

  In the vehicle headlamp module 210 of the third embodiment, the light emitted from the light source 212 is refracted and incident on the incident surface 214 of the first light transmissive member 213a, and the first light transmissive member 213a and the second light transmissive member 213a. Refracts and passes through the boundary refracting surface 215 at the interface with the light transmitting member 213b, is reflected by the internal reflecting surface 216 of the second light transmitting member 213b, and is refracted from the design emitting surface 217 of the second light transmitting member 213b. Then exit. And it irradiates from the design output surface 217 to the vehicle front side.

  As described above, even in the third embodiment using the lens body 211 in which the first light-transmissive member 213a and the second light-transmissive member 213b are integrated at the boundary refracting surface 215, the same as in the first embodiment. Thus, it is possible to improve the degree of freedom of the shape of the design exit surface 217 while suppressing chromatic aberration.

(Fourth embodiment)
FIG. 6 is a perspective view of a vehicle headlamp module 310 according to the fourth embodiment of the present invention.
In the vehicle headlamp module 310 according to the fourth embodiment, the lens body 311 having the same shape as that of the first embodiment is different from the first light transmissive member 313a, the second light transmissive member 313b, and the second light transmissive member 313b. 3 translucent members 313c are integrally formed. The first light transmissive member 313 a has an incident surface 314, the second light transmissive member 313 b has an internal reflection surface 316, and the third light transmissive member 313 c has a design emission surface 317.
Further, the first light transmitting member 313a and the second light transmitting member 313b are integrated at the first boundary refracting surface 315a, and the second light transmitting member 313b and the third light transmitting member 313c are the second light transmitting member 313c. The boundary refracting surface 315b is integrated.
Others are the same as in the first embodiment.

  As each material of the 1st translucent member 313a, the 2nd translucent member 313b, and the 3rd translucent member 313c, the 1st translucent member 313a and the 3rd translucent member 313c are 2nd translucent. The member 313b has a refractive index higher than that of the member 313b. In the present embodiment, polycarbonate resin, methacrylic resin, or cycloolefin resin may be used as the first light transmitting member 313a, the second light transmitting member 313b, and the third light transmitting member 313c.

  In the vehicle headlamp module of the fourth embodiment, the light emitted from the light source 312 is refracted and incident on the incident surface 314 of the first light transmissive member 313a, and the first light transmissive member 313a and the second light transmissive member 313a. The light passes through the first boundary refracting surface 315a at the interface with the translucent member 313b, is refracted and reflected by the internal reflecting surface 316 of the second translucent member 313b, and the second translucent member 313b and the third translucent member 313b. The light refracts and passes through the second boundary refracting surface 315b at the interface with the optical member 313c, and is refracted and emitted from the design emitting surface 317 of the third light transmitting member 313c. And it irradiates from the design output surface 317 to the vehicle front side.

  Even the vehicular headlamp module 310 of the fourth embodiment using such a lens body 311 can obtain the same effects as those of the first embodiment, and the design emission surface 317 while suppressing chromatic aberration. It is possible to improve the degree of freedom of the shape.

Each of the above embodiments can be appropriately changed within the scope of the present invention.
For example, in the first, second, and fourth embodiments, the example in which the internal reflection surface is provided on the flat surface formed on the second light transmissive member has been described. However, the internal reflection surface is provided on the first light transmissive member. It is also possible.
In each of the above embodiments, the number of translucent members constituting the lens body, the number of internal reflections, and the like are not limited in any way and can be increased or decreased.
Furthermore, in each of the above-described embodiments, the present invention can be applied even if the magnitude relationships of the refractive indexes of a plurality of types of translucent members are reversed.

The vehicular headlamp module according to the first embodiment is configured by adopting polycarbonate resin as the first translucent member 13a and employing methacrylic resin as the second translucent member 13b.
Using this vehicular headlamp module, light distribution patterns of light having a representative value, blue light having a wavelength of 400 nm, and red light having a wavelength of 700 nm were confirmed.

FIG. 7 is a diagram illustrating (a) a light distribution pattern of light having a representative wavelength, (b) an alignment pattern of blue light, and (c) an alignment pattern of red light.
In any of FIGS. 7A, 7B, and 7C, the position of the light / dark boundary line is substantially the same position 0.5 ° to 0.6 ° below the horizontal line, and no chromatic aberration occurs. confirmed.
In such a vehicle headlamp module, it is possible to prevent color separation in the cut-off line even if the design emission surface is designed as an inclined surface.

  DESCRIPTION OF SYMBOLS 10,110,210,310 ... Vehicle headlamp module, 11, 111, 211, 311 ... Lens body, 12, 112, 312 ... Light source, 13 ... Translucent member, 13a, 113a, 213a, 313a ... 1st Translucent member, 13b, 113b, 213b, 313b ... second translucent member, 14, 114, 214, 314 ... incident surface, 15, 215 ... boundary refracting surface, 15a, 115a, 315a ... first boundary refracting Surface, 15a, 15b, 115b, 315b ... second boundary refracting surface, 16, 216, 316 ... internal reflection surface, 17, 117, 217, 317 ... design exit surface, L ... light

Claims (7)

In a vehicle headlamp module that distributes light toward the front of the vehicle,
A lens body integrally formed with a plurality of types of translucent members having different refractive indexes;
A light source that emits light along the optical axis toward the lens body,
The lens body is
An incident surface for allowing the light rays to enter the inside of the lens body;
A boundary refracting surface that refracts the light beam by forming a boundary between the other types of the translucent members inside the lens body;
An internal reflection surface for internally reflecting the light beam;
A design emitting surface for emitting the light beam toward the front of the vehicle,
The light ray is incident on one or both of the incident surface and the design exit surface obliquely with respect to the normal line, and the light ray is incident on the boundary refracting surface obliquely with respect to the normal line.
Vehicle headlight module. The plurality of types of light-transmitting members include a first light-transmitting member and a second light-transmitting member having different refractive indexes,
The first translucent member includes the incident surface,
The boundary refracting surface between the first light transmissive member and the second light transmissive member includes a first boundary refracting surface that causes the light incident from the incident surface to enter the second light transmissive member. ,
The incident angle of the light beam on the incident surface and the incident angle of the light beam on the first boundary refracting surface according to the difference in the refractive index of the first light transmitting member and the refractive index of the second light transmitting member. Different from each other,
The vehicle headlamp module according to claim 1. The plurality of types of light-transmitting members include a first light-transmitting member and a second light-transmitting member having different refractive indexes,
The first translucent member includes the design emission surface,
The boundary refracting surface between the first light transmissive member and the second light transmissive member is a second member that causes the light beam that has passed through the inside of the second light transmissive member to enter the first light transmissive member. A boundary refracting surface of
Depending on the difference in refractive index between the first light transmissive member and the second light transmissive member, the incident angle of the light beam on the design exit surface and the incident light beam on the second boundary refracting surface. The horns were different from each other,
The vehicle headlamp module according to claim 1 or 2. The plurality of types of light-transmitting members include a first light-transmitting member and a second light-transmitting member having different refractive indexes,
The first translucent member includes the incident surface and the design emitting surface,
The boundary refracting surface between the first light transmissive member and the second light transmissive member is a first boundary refracting surface that makes the light incident from the incident surface incident on the second light transmissive member; A second boundary refracting surface that causes the light beam that has passed through the inside of the second light transmitting member to enter the first light transmitting member.
The vehicle headlamp module according to claim 1. The incident angle of the light beam on the first boundary refractive surface and the emission angle of the light beam on the second boundary refractive surface are different from each other,
The vehicle headlamp module according to claim 4. The refractive index of the first light transmissive member is larger than the refractive index of the second light transmissive member,
An incident angle of the light beam on the second boundary refractive surface is larger than an incident angle of the light beam on the first boundary refractive surface;
The vehicle headlamp module according to claim 4 or 5. The design emission surface is inclined with respect to the vertical direction of the vehicle.
The vehicle headlamp module according to any one of claims 1 to 6.