WO2024047718A1 - 前照灯モジュール - Google Patents

前照灯モジュール Download PDF

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Publication number
WO2024047718A1
WO2024047718A1 PCT/JP2022/032475 JP2022032475W WO2024047718A1 WO 2024047718 A1 WO2024047718 A1 WO 2024047718A1 JP 2022032475 W JP2022032475 W JP 2022032475W WO 2024047718 A1 WO2024047718 A1 WO 2024047718A1
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WO
WIPO (PCT)
Prior art keywords
light
section
projection
cut
light distribution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/032475
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English (en)
French (fr)
Japanese (ja)
Inventor
智英 森本
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2022/032475 priority Critical patent/WO2024047718A1/ja
Priority to JP2024543626A priority patent/JP7766812B2/ja
Publication of WO2024047718A1 publication Critical patent/WO2024047718A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/27—Thick lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape

Definitions

  • the present disclosure relates to a headlamp module used in a headlamp device that illuminates the front of a vehicle body, for example.
  • Patent Document 1 proposes a headlamp module that has a simplified structure and is miniaturized without reducing light utilization efficiency.
  • the headlamp module proposed in Patent Document 1 includes a light source distribution element for a headlamp device, a first cut-off line forming section, and a second cut-off line forming section.
  • the light source distribution element for a headlamp device is located between the first joint surface of the input section and the first output section, and guides light from the first joint surface of the input section to the first output section.
  • a first reflective surface located between the first light guide section, the second joint surface of the incident section and the second output section, and formed on one side surface of the opposite side surface in the other direction; It has a second reflective surface formed on the other side surface of the side surfaces facing each other in the direction, and the first reflective surface and the second reflective surface reflect the light from the second bonded surface of the incident part. and a second light guiding section that guides the light to the second light emitting section.
  • the first cut-off line forming section is integrally formed from the first output surface of the first output section, and outputs light on which a cut-off line has been formed with respect to the light output from the first output surface.
  • the second cut-off line forming section is integrally formed from the second output surface of the second output section, and outputs light with a cut-off line formed with respect to the light output from the second output surface.
  • the headlamp module proposed in Patent Document 1 has a simple structure and can be made thinner and smaller in vertical direction without reducing light utilization efficiency.
  • a headlamp module includes an entrance part into which light from a light source is incident and which has a plurality of joint surfaces located along one direction in a plane orthogonal to the optical axis of the light source, and a plurality of joints of the entrance part. It has a plurality of output surfaces corresponding to each surface and located along one direction and the other direction perpendicular to the plane perpendicular to the optical axis of the light source, and each of them directs the light from the corresponding joint surface to the corresponding output surface.
  • a collective light guiding section that guides the light
  • a light distribution forming section that has at least one projection surface located along the other direction, reflects the light from the plurality of exit surfaces to one end side in one direction, and guides it to the projection surface.
  • the light distribution forming section combines and guides light from at least two or more adjacent exit surfaces among the plurality of exit surfaces onto one of the projection surfaces.
  • FIG. 2 is a perspective view of the headlamp module according to Embodiment 1, seen from above on the right side.
  • FIG. 2 is a perspective view of the headlamp module according to the first embodiment, seen from the left side.
  • FIG. 2 is a perspective view of the headlamp module according to Embodiment 1, seen from below on the right side.
  • 1 is a front view showing a headlamp module according to Embodiment 1.
  • FIG. 1 is a top view showing a headlamp module according to Embodiment 1.
  • FIG. FIG. 3 is a bottom view showing the headlamp module according to the first embodiment.
  • 1 is a side view showing a headlamp module according to Embodiment 1.
  • FIG. FIG. 2 is a partially cross-sectional front view showing the entrance portion of the headlamp module according to the first embodiment.
  • FIG. 3 is a diagram showing the illuminance distribution at the joint surface at the entrance part of the headlamp module according to the first embodiment.
  • FIG. 2 is a perspective view of the headlamp module according to the first embodiment, viewed from above on the right side, showing the luminous flux.
  • FIG. 3 is a top view showing the luminous flux in the headlamp module according to the first embodiment.
  • FIG. 3 is a rear view showing the luminous flux in the headlamp module according to the first embodiment.
  • FIG. 3 is a side view showing a luminous flux in the headlamp module according to the first embodiment.
  • FIG. 7 is a perspective view of the headlamp module according to Embodiment 2, seen from below on the right side.
  • FIG. 7 is a perspective view of a headlamp module according to Embodiment 3, seen from below on the right side.
  • Embodiment 1 A headlamp module according to Embodiment 1 will be described based on FIGS. 1 to 13.
  • the headlamp module satisfies the predetermined light distribution pattern stipulated by road traffic regulations, etc., and is suitable for automobiles, motorcycles, three-wheeled vehicles called gyros (scooters made of three wheels with one wheel in the front and two wheels in the rear, and motorized vehicles). Used in headlight devices that illuminate the front of bicycles.
  • the headlight device has a low beam and a high beam.
  • the headlamp module according to Embodiment 1 can be used for low beams and high beams, and is particularly suitable for use for low beams.
  • the present invention is applied to a low beam of an automobile headlamp device.
  • the number of headlamp modules may be one, or a plurality of headlamp modules may be arranged in parallel in the left-right direction.
  • Light distribution refers to the luminous intensity distribution of a light source in space. In other words, it is the spatial distribution of light emitted from a light source.
  • Luminous intensity indicates the intensity of light emitted by a light emitter, and is the luminous flux passing within a small solid angle in a certain direction divided by that small solid angle.
  • the low beams of automobile headlight devices and motorcycle headlight devices are required to have a horizontally elongated light distribution pattern that is narrow in the vertical direction. It is required that the upper light boundary line, that is, the cutoff line, be clear.
  • the light distribution pattern indicates the shape of a luminous flux and the intensity distribution of light caused by the direction of light emitted from the light source 1.
  • the light distribution pattern is also used to mean the illuminance pattern on the irradiation surface.
  • the light distribution is the distribution of light intensity in the direction of light emitted from a light source. Light distribution is also used to mean illuminance distribution on the irradiation surface.
  • a clear required cutoff line means that the area above the cutoff line, that is, the outside of the light distribution pattern, is dark, and the area below the cutoff line, that is, the inside of the light distribution pattern, is bright.
  • the cut-off line is a dividing line between bright and dark light that is created when a wall or screen is irradiated with light from a headlamp device, and is a dividing line on the upper side of a light distribution pattern. That is, the cut-off line is the boundary line between bright and dark light on the upper side of the light distribution pattern. It is the boundary line between the bright area above the light distribution pattern, that is, the inside of the light distribution pattern, and the dark area, ie, the outside of the light distribution pattern.
  • the cutoff line is a term used when adjusting the irradiation direction of a headlamp device for passing each other. A headlight device for passing each other is also called a low beam.
  • Low beams are required to provide maximum illumination in the area below the cutoff line.
  • This region of maximum illuminance is called a high illuminance region.
  • the area below the cut-off line means the upper part of the light distribution pattern, and corresponds to the part that illuminates a distant area in a headlamp device.
  • the cutoff line In order to achieve a clear cutoff line, the cutoff line must not have large chromatic aberrations or blurring. Blurring of the cut-off line means that the cut-off line becomes unclear.
  • the cutoff line In the low beam of a headlamp device for an automobile, the cutoff line has a stepped shape with a rising line.
  • the cutoff line In the low beam of a motorcycle headlamp device, the cutoff line is a horizontal straight line in the left-right direction of the vehicle, and the light distribution pattern is brightest in the area below the cutoff line, that is, the area inside the light distribution pattern.
  • the headlight device since the headlight device is placed on the front of the vehicle, design is important, and there is a need for a headlight device with a higher degree of freedom in design. If the headlight device is made thinner in the vertical direction of the vehicle in order to improve its design, the efficiency of light utilization will be low.
  • the headlamp module includes a light source distribution element 100 for a headlamp device (hereinafter abbreviated as light source distribution element 100) and a light distribution forming section 200, and the light source distribution element 100 changes the appearance of the light source 1.
  • the light source distribution element 100 changes the appearance of the light source 1.
  • the emission surface of the light source distribution element 100 by setting the emission surface of the light source distribution element 100 to five emission surfaces 121a to 125a, the length of the side in the front and back direction of the emission surface of the light source distribution element 100, which serves as an apparent light source, and the length of the light distribution forming part 200 are reduced.
  • the length of the vertical side of the projection surface By making the projection surface of the light distribution forming section 200 into three projection surfaces 231a to 233a, the length of the horizontal side of the projection surface of the light distribution forming section 200 can be made smaller. The length can be made smaller, making it thinner and smaller.
  • the output surfaces of the light source distribution element 100 are referred to as five output surfaces 121a to 125a
  • the description will focus on the light source distribution element 100 in which the light distribution forming section 200 has three projection surfaces 231a to 233a.
  • the collective light guide section 120 may have a plurality of output surfaces, and the number of projection surfaces of the light distribution forming section 200 may be smaller than the number of output surfaces of the collective light guide section 120.
  • the light distribution forming unit 200 combines light from at least two or more adjacent exit surfaces among the plurality of exit surfaces 121a to 125a of the light source distribution element 100 to one of the projection surfaces 231a to 233a. and guide you.
  • the left and right direction of the vehicle is defined as the X-axis direction.
  • the right side is the + direction of the X-axis
  • the left side is the - direction of the X-axis.
  • the term "front" refers to the direction in which the vehicle is traveling. That is, the front is the direction in which the headlamp device emits light.
  • the X-axis direction is the other direction
  • one end side is the ⁇ direction (right side)
  • the other end side is the + direction (left side).
  • one end side is referred to as the right side and the other end side as the left side, this is specified for convenience of explanation, and the one end side may be referred to as the left side and the other end side as the right side.
  • the vertical direction of the vehicle is the Y-axis direction.
  • the upper side is the + direction of the Y-axis
  • the lower side is the - direction of the Y-axis.
  • the upper side is the direction of the sky
  • the lower side is the direction of the ground (road surface, etc.).
  • Let the direction of travel of the vehicle be the Z-axis direction.
  • the direction of movement is defined as the + direction of the Z-axis
  • the opposite direction is defined as the - direction of the Z-axis.
  • the + direction of the Z-axis is called the front
  • the - direction of the Z-axis is called the rear.
  • the + direction of the Z-axis is the direction in which the headlight emits light.
  • the Z-axis direction is one direction
  • one end side is the + direction
  • the other end side is the forward direction when used for an automobile
  • the other end side is the ⁇ direction
  • the rear side is the one direction.
  • the ZX plane is parallel to the road surface.
  • a road surface is usually considered to be a horizontal plane, ie, a plane perpendicular to the direction of gravity.
  • the road surface may be inclined, such as uphill or downhill, with respect to the direction in which the vehicle is traveling.
  • the road surface may be inclined in the left-right direction.
  • a horizontal plane that is parallel to the road surface is not necessarily a plane perpendicular to the direction of gravity, but a horizontal plane that is perpendicular to the direction of gravity is a plane, and a Z-X plane is a plane that is perpendicular to the direction of gravity.
  • the following explanation is given as a plane.
  • the headlamp module includes a light source distribution element 100 and a light distribution forming section 200, as shown in FIGS. 1 to 7.
  • the headlamp device further includes a light source 1 in addition to the headlamp module.
  • the light source 1 emits light for illuminating the front of the vehicle.
  • the light source 1 is disposed on the - side of the Y-axis of the light source distribution element 100, and emits light in the + direction of the Y-axis.
  • the optical axis of the light source 1 is an axis along the Y-axis direction.
  • the light source 1 has a rectangular output surface that outputs light on the front side.
  • the light source 1 is a tube light source such as an incandescent lamp, a halogen lamp, or a fluorescent lamp, a light emitting diode (LED), or a laser diode (LD). ) or other semiconductor light sources. From the viewpoint of reducing the burden on the environment by suppressing carbon dioxide (CO 2 ) emissions and fuel consumption, it has higher luminous efficiency and is more directional than halogen lamps, making it possible to make the optical system smaller and lighter. Preference is given to using semiconductor light sources.
  • the headlamp device according to the present disclosure uses an LED, which is one of semiconductor light sources.
  • the light source distribution element 100 and the light distribution forming section 200 are integrally formed of a transparent material, and the interface between the components does not have a physical interface but a virtual interface. It is. However, when the light source distribution element 100 and the light distribution forming part 200 are formed of different transparent materials, the output surfaces 121a to 125a of the light source distribution element 100 are physically exposed surfaces, and the light distribution forming part 200 When assembled, the emission surfaces 121a to 125a of the light source distribution element 100 are coupled to the light distribution forming part 200.
  • the headlamp module is manufactured by injection molding and is made of a transparent material filled with a refractive material.
  • the material from which the headlamp module is manufactured is preferably a material that has high transparency from the viewpoint of light utilization efficiency and has excellent heat resistance since the light source distribution element 100 is disposed immediately after the light source 1.
  • transparent resin such as glass or silicone material is good.
  • acrylic resin especially PMMA: polymethyl methacrylate
  • PC polycarbonate
  • the light source distribution element 100 receives the light from the light source 1 and has first to fifth output surfaces 121a to 125a, and the first to fifth output surfaces 125a receive the light from the light source 1.
  • first to fifth output surfaces 121a to 125a receive the light from the light source 1.
  • Z-axis direction on a plane perpendicular to the axis and in the other direction (X-axis direction) perpendicular to one direction
  • the direction from one end side (+ side of the X-axis) to the other end side (X-axis direction) is
  • the third exit surface 123a, the second exit surface 122a, the first exit surface 121a, the fourth exit surface 124a, and the fifth exit surface 125a are arranged in this order toward the ⁇ side of the axis, and the light is incident from the light source 1.
  • the light is guided from the first output surface to the fifth output surface.
  • the light source distribution element 100 includes an incident part 110 and a collective light guide part 120.
  • the incident part 110 is a collimator that has a conical shape, has a lens 116 at its apex, and has a bottom surface of the conical shape as a joint surface of the collective light guide part 120.
  • the joint surface has a diameter of 20 mm, for example.
  • the light emitted from the light source 1 enters the lens 116, and guides parallel light, ideally parallel light, to the cemented surface.
  • light rays with a small emission angle are incident on the lens 116 and then directly guided to the conical bottom surface of the entrance section 110 (the joint surface of the collective light guide section 120).
  • light rays having a large emission angle enter the lens 116 , are reflected by the reflective surface 117 , and are guided to the conical bottom surface of the incident part 110 .
  • the light beam directly guided from the lens 116 and the light beam reflected and guided by the reflective surface 117 are guided as parallel light to the joint surface of the collective light guide section 120.
  • FIG. 9 shows the illuminance distribution at the joint surface of the light source distribution element 100 when an LED that emits light with a long length in the X-axis direction is used as the light source 1.
  • the joint surfaces of the light source distribution element 100 have the same length, that is, the same width, along one direction in a plane perpendicular to the optical axis of the light source 1, that is, the Z-axis direction.
  • a first bonding surface 111 that is divided and located in the center, a second bonding surface 112 and a third bonding surface 113 that are located in order from the center to one end side in one direction, that is, on the + side of the Z axis, and a center portion.
  • the bonding surfaces, the first bonding surface 111 to the fifth bonding surface 115, are virtual surfaces indicating interfaces with the collective light guide section 120.
  • the collective light guide section 120 has a joint surface that joins the joint surface of the incident section 110 .
  • the collective light guide section 120 is arranged on a plane parallel to the joint surface of the incident section 110, that is, on the ZX plane, and from the first output surface 121a arranged without overlapping in the Z-axis direction and the X-axis direction. It has five exit surfaces 125a, and guides the light from the joint surface of the entrance section 110 from the first exit surface 121a to the fifth exit surface 125a.
  • the fifth output surface 125a, the fourth output surface 124a, the first output surface 121a, the second output surface 122a, and the third output surface 123a are arranged in this order from the other end side.
  • the fifth output surface 125a, the fourth output surface 124a, the first output surface 121a, the second output surface 122a, and the third output surface 123a are arranged in this order from the other end side.
  • the first to fifth output surfaces 121a to 125a are rectangular and have the same length in the Z-axis direction. Note that the lengths of the respective emission surfaces in the X-axis direction may be different.
  • the length of the first output surface 121a in the X-axis direction is W
  • the length of the second output surface 122a and the fourth output surface 124a in the X-axis direction is shorter than W1
  • the length of the fifth output surface 125a in the X-axis direction is W2 , which is shorter than W1 .
  • the relationship between W, W 1 and W 2 is W>W 1 >W 2 .
  • the lengths in the X-axis direction of the second output surface 122a, the second light guide section 122, the second condensing optical section 212, the second light distribution section 222, and the second projection lens 232 and the fourth The lengths of the output surface 124a, the fourth light guide section 124, the fourth condensing optical section 214, the fourth light distribution section 224, and the fourth projection lens 234 in the X-axis direction may be different.
  • the lengths in the X-axis direction and the The lengths of the fifth light emitting surface 125a, the fifth light guiding section 125, the fifth condensing optical section 215, the fifth light distribution section 225, and the fifth projection lens 235 in the X-axis direction may be different. .
  • the collective light guide section 120 includes a first light guide section 121 to a fifth light guide section 125.
  • the first light guide section 121 to the fifth light guide section 125 each have a pair of opposing surfaces that face each other parallel to the X-axis direction in the plane ZX plane perpendicular to the optical axis of the light source 1, that is, the Y-axis. It is a columnar body having a rectangular shape in the Z-X cross section.
  • the first light guide section 121 has a pair of parallel opposing surfaces facing the first output surface 121a in the X-axis direction, and directs the light from the first joint surface 111 of the input section 110 to the first output surface. 121a.
  • the first light guiding section 121 has a pair of opposing surfaces parallel to the Y axis, stands upright from the first joint surface 111 of the incident section 110, and is formed integrally with the incident section 110.
  • the distance between the pair of opposing surfaces along the X-axis direction is W, which is the same as the distance W between the first output surface 121a along the X-axis direction.
  • the first light guide section 121 has a rectangular parallelepiped shape that connects linearly from the first joint surface 111 of the incident section 110 to the first output surface 121a.
  • the first light guide section 121 causes the light from the first joint surface 111 of the incident section 110 to travel straight to the first output surface 121a along the Y axis, as shown as a light beam L1 in FIGS. 10 to 12. .
  • the second light guide section 122 has a pair of parallel opposing surfaces facing the second exit surface 122a in the X-axis direction, and directs the light from the second joint surface 112 of the entrance section 110 to the second exit surface. 122a.
  • a pair of opposing surfaces in the second light guide section 122 have a pair of reflective surfaces, that is, a first reflective surface 122b located at the center in the X-axis direction and a second reflective surface 122c located at one end.
  • the opposing surface on one end side in the X-axis direction of the pair of opposing surfaces in the second light guide section 122 extends from the bottom surface in contact with the second bonding surface 112 of the incident section 110 to the second surface perpendicular to the second bonding surface 112.
  • It has a second reflecting surface 122c that is inclined at 45 degrees toward one end with respect to the second bonding surface 112 from the upper side of the second rising surface 122d to the second exit surface 122a.
  • the second light guide section 122 is integrated with the incident section 110 such that the first reflective surface 122b and the second reflective surface 122c are each inclined at 45 degrees toward one end with respect to the optical axis of the light source 1. It is formed.
  • the first reflective surface 122b is the entire surface of the opposing surface located at the center in the X-axis direction.
  • the distance between the first reflective surface 122b and the second reflective surface 122c along the X-axis direction is W1 , which is the same as the distance W1 between the second output surface 122a along the X-axis direction.
  • the length from the bottom to the top of the second rising surface 122d corresponds to the length for obtaining the offset amount (W ⁇ W 1 ) with respect to the length W 1 of the second exit surface 122a in the X-axis direction.
  • the second light guide section 122 is formed integrally with the incident section 110 and has a columnar shape. Note that 45 degrees does not indicate a strict 45 degrees, but refers to a range of 45 degrees ⁇ taking into account design margins, etc. ⁇ . Also in the following description, 45 degrees refers to the range of 45 degrees ⁇ .
  • the angle at which the reflective surface is tilted does not need to be limited to 45 degrees. Since it is desirable that the reflective surface be a total reflective surface, the ideal angle of inclination is about 45 degrees. However, in the case of a mirror surface formed by metal vapor deposition or the like, the angle of inclination can be freely designed. However, it is desirable that the reflective surface functions as a total reflection surface. This is because a total reflection surface has a higher reflectance than a mirror surface and contributes to improving the efficiency of light use. Further, by eliminating the mirror vapor deposition process, the manufacturing process of the light source distribution element 100 can be simplified, contributing to a reduction in the manufacturing cost of the light source distribution element 100.
  • the second light guiding section 122 allows the light from the second joint surface 112 of the incident section 110 to be directed from the first reflecting surface 122b to the second reflecting surface 122c, as shown as a light beam L2 in FIGS. 10 to 12.
  • the light is totally reflected, and the second reflecting surface 122c totally reflects it to the second exit surface 122a, and guides it to the second exit surface 122a.
  • the second light guiding section 122 ultimately guides the light from the second joint surface 112 of the incident section 110 to the second exit surface 122a as parallel light along the Y-axis.
  • the amount of light totally reflected by the second reflecting surface 122c of the light totally reflected by the first reflecting surface 122b is determined by In this case, since there is no light from the second bonding surface 112 of the incident part 110, it is comparable to the case where the second rising surface 122d is not provided.
  • the third light guide section 123 has a pair of parallel opposing surfaces facing the third exit surface 123a in the X-axis direction, and directs the light from the third joint surface 113 of the entrance section 110 to the third exit surface. 123a.
  • a pair of opposing surfaces in the third light guide section 123 have a pair of reflective surfaces, that is, a third reflective surface 123b located at the center in the X-axis direction and a fourth reflective surface 123c located at one end.
  • the opposing surface on one end side in the X-axis direction of the pair of opposing surfaces in the third light guide section 123 extends from the bottom surface in contact with the third bonding surface 113 of the incident section 110 to the fourth surface perpendicular to the third bonding surface 113. It has a fourth reflecting surface 123c that is inclined at 45 degrees toward one end with respect to the third joint surface 113 from the upper side of the fourth rising surface 123d to the third output surface 123a.
  • the third light guiding section 123 is integrated with the incident section 110 such that the third reflecting surface 123b and the fourth reflecting surface 123c are each inclined at 45 degrees toward one end with respect to the optical axis of the light source 1. It is formed.
  • the third reflective surface 123b is the entire surface of the opposing surface located at the center in the X-axis direction.
  • the distance between the third reflective surface 123b and the fourth reflective surface 123c along the X-axis direction is (W 1 +W 2 ). Note that the angle at which the third reflective surface 123b and the fourth reflective surface 123c are tilted does not need to be limited to 45 degrees, as described for the first reflective surface 122b and the second reflective surface 122c. do not have.
  • the distance W 2 of the third output surface 123a along the X-axis direction is the distance between the third reflection surface 123b and the fourth reflection surface 123c along the X-axis direction (W 1 +W 2 ) to the second This is the value obtained by subtracting the distance W 1 between the first reflective surface 122b and the second reflective surface 122c in the light guide section 122 along the X-axis direction.
  • the distance (W 1 +W 2 ) between the third reflective surface 123b and the fourth reflective surface 123c of the third light guide 123 along the X-axis direction is equal to the first reflection of the second light guide 122. It is shorter than 2W1 , which is twice the distance W1 between the surface 122b and the second reflective surface 122c along the X-axis direction.
  • the length from the bottom to the top of the fourth rising surface 123d is the offset amount (W-W 2 ) with respect to the length W 2 of the third exit surface 123a in the X-axis direction, in other words, (2W-(W 1 +W 2 ) Corresponds to the length to obtain ).
  • the third light guide section 123 is formed integrally with the incident section 110 and has a columnar shape.
  • the third light guiding section 123 allows the light from the third joint surface 113 of the incident section 110 to be directed from the third reflecting surface 123b to the fourth reflecting surface 123c, as shown as a light beam L3 in FIGS. 10 to 12.
  • the light is totally reflected, and the fourth reflecting surface 123c totally reflects it to the third exit surface 123a, and guides it to the third exit surface 123a.
  • the third light guide section 123 ultimately guides the light from the third joint surface 113 of the entrance section 110 to the third output surface 123a as parallel light along the Y axis.
  • the amount of light totally reflected by the fourth reflective surface 123c of the light totally reflected by the third reflective surface 123b is determined by In this case, since there is no light from the third bonding surface 113 of the incident part 110, it is comparable to the case where the fourth rising surface 123d is not provided.
  • the third reflective surface 123b of the third light guide section 123 is continuous with the first reflective surface 122b of the second light guide section 122 on one end side in the Z-axis direction.
  • the third light guiding section 123 is a second guiding section from the third joint surface 113 of the incident section 110 to the position of the first reflecting surface 122b of the second light guiding section 122 and the position of the second reflecting surface 122c. It is formed integrally with the light section 122. That is, the portion from the third reflective surface 123b of the third light guide section 123 to the second reflective surface 122c of the second light guide section 122 is formed integrally with the second light guide section 122.
  • the fourth reflective surface 123c of the third light guide section 123 is extended by 2 minutes X from the position of the second reflective surface 122c of the second light guide section 122 to the length W in the X-axis direction of the third output surface 123a. It is located away from one end in the axial direction. That is, the distance between the third reflective surface 123b and the fourth reflective surface 123c along the X-axis direction is the It is twice the distance W 1 along the axial direction, that is, shorter than 2W 1 (W 1 +W 2 ).
  • a common light guide section has a shape in which two second light guide sections 122 are arranged in parallel in the Z-axis direction. From the position of the first reflecting surface 122b of the second light guiding section 122 to the position of the second reflecting surface 122c, the boundary surface between the second light guiding section 122 and the third light guiding section 123 is a physical boundary. It does not have a surface, but a virtual surface.
  • the fourth light guide section 124 has a pair of parallel opposing surfaces facing the fourth output surface 124a in the X-axis direction, and directs the light from the fourth joint surface 114 of the input section 110 to the fourth output surface 124a.
  • a pair of opposing surfaces in the fourth light guiding section 124 have a pair of reflective surfaces, that is, a fifth reflective surface 124b located on the center side in the X-axis direction and a sixth reflective surface 124c located on the other end side. .
  • the opposing surface on the other end side in the X-axis direction of the pair of opposing surfaces in the fourth light guide section 124 extends from the bottom surface in contact with the fourth bonding surface 114 of the incident section 110 to the bottom surface perpendicular to the fourth bonding surface 114. 6, and has a sixth reflecting surface 124c that is inclined at 45 degrees toward the other end with respect to the fourth joint surface 114 from the upper side of the sixth rising surface 124d to the fourth output surface 124a.
  • the fourth light guiding section 124 is integrated with the incident section 110 such that the fifth reflecting surface 124b and the sixth reflecting surface 124c are each inclined at 45 degrees toward one end with respect to the optical axis of the light source 1. It is formed.
  • the sixth reflective surface 124c is the entire surface of the opposing surface located on the center side in the X-axis direction.
  • the fifth reflective surface 124b and the sixth reflective surface 124c are also As described with respect to the surface 122c, the angle at which the reflective surface is tilted does not need to be limited to 45 degrees.
  • the distance between the fifth reflective surface 124b and the sixth reflective surface 124c along the X-axis direction is W1 , which is the same as the distance W1 between the fourth output surface 124a along the X-axis direction.
  • the length from the bottom to the top of the sixth rising surface 124d corresponds to the length for obtaining the offset amount (W-W 1 ) with respect to the length W 1 of the fourth exit surface 124a in the X-axis direction.
  • the fourth light guide section 124 is formed integrally with the incident section 110 and has a columnar shape.
  • the fourth light guiding section 124 allows the light from the fourth joint surface 114 of the incident section 110 to be directed from the fifth reflecting surface 124b to the sixth reflecting surface 124c, as shown as a light beam L4 in FIGS. 10 to 12.
  • the light is totally reflected, and the sixth reflecting surface 124c totally reflects it to the fourth exit surface 124a, and guides it to the fourth exit surface 124a.
  • the fourth light guide section 124 ultimately guides the light from the fourth joint surface 114 of the entrance section 110 to the fourth output surface 124a as parallel light along the Y-axis.
  • the amount of light totally reflected by the sixth reflective surface 124c of the light totally reflected by the fifth reflective surface 124b is determined by In this case, since there is no light from the fourth bonding surface 114 of the incident part 110, it is comparable to the case where the sixth rising surface 124d is not provided.
  • the shape of the fourth light guide section 124 and the shape of the second light guide section 122 are line symmetrical with respect to the Y axis.
  • the fifth light guide section 125 has a pair of parallel opposing surfaces facing the fifth exit surface 125a in the X-axis direction, and directs the light from the fifth joint surface 115 of the entrance section 110 to the fifth exit surface. 125a.
  • a pair of opposing surfaces in the fifth light guide section 125 have a pair of reflective surfaces, that is, a seventh reflective surface 125b located at the center in the X-axis direction and an eighth reflective surface 125c located at the other end. .
  • the opposing surface on the other end side in the X-axis direction of the pair of opposing surfaces in the fifth light guide section 125 extends from the bottom surface in contact with the fifth bonding surface 115 of the incident section 110 to the plane perpendicular to the fifth bonding surface 115.
  • the eighth reflecting surface 125c is inclined at 45 degrees toward the other end with respect to the fifth joint surface 115 from the upper side of the eighth rising surface 125d to the fifth output surface 125a.
  • the fifth light guiding section 125 is integrated with the incident section 110 such that the seventh reflecting surface 125b and the eighth reflecting surface 125c are each inclined at 45 degrees toward one end with respect to the optical axis of the light source 1. It is formed.
  • the angle at which the reflective surfaces are tilted for the seventh reflective surface 125b and the eighth reflective surface 125c does not need to be limited to 45 degrees, as described for the first reflective surface 122b and the second reflective surface 122c. do not have.
  • the eighth reflective surface 125c is the entire surface of the opposing surface located at the center in the X-axis direction. The distance between the seventh reflective surface 125b and the eighth reflective surface 125c along the X-axis direction is (W 1 +W 2 ).
  • the distance W 2 of the fifth output surface 125a along the X-axis direction is the distance W 2 between the seventh reflective surface 125b and the eighth reflective surface 125c along the X-axis direction (W 1 +W 2 ) to the fourth This is the value obtained by subtracting the distance W 1 between the fifth reflective surface 124b and the sixth reflective surface 124c in the light guide section 124 along the X-axis direction.
  • the distance (W 1 +W 2 ) between the seventh reflective surface 125b and the eighth reflective surface 125c of the fifth light guiding section 125 along the X-axis direction is equal to It is shorter than twice 2W1 of the distance W1 between the surface 124b and the sixth reflective surface 124c along the X-axis direction.
  • the length from the bottom to the top of the eighth rising surface 125d is the offset amount (W-W 2 ) with respect to the length W 2 of the fifth exit surface 125a in the X-axis direction, in other words, (2W-(W 1 +W 2 ) Corresponds to the length to obtain ).
  • the fifth light guiding section 125 is formed integrally with the incident section 110 and has a columnar shape.
  • the seventh reflecting surface 125b directs the light from the fifth joint surface 115 of the incident section 110 to the eighth reflecting surface 125c, as shown as a light beam L5 in FIGS. 10 to 12.
  • the light is totally reflected, and the eighth reflecting surface 125c totally reflects it to the fifth exit surface 125a, and guides it to the fifth exit surface 125a.
  • the fifth light guide section 125 ultimately guides the light from the fifth joint surface 115 of the entrance section 110 to the fifth output surface 125a as parallel light along the Y axis.
  • the amount of light that is totally reflected by the seventh reflective surface 125b and the eighth reflective surface 125c is determined by In this case, since there is no light from the fifth bonding surface 115 of the incident part 110, it is comparable to the case where the eighth rising surface 125d is not provided.
  • the seventh reflective surface 125b of the fifth light guide section 125 is continuous with the fifth reflective surface 124b of the fourth light guide section 124 on the other end side in the Z-axis direction.
  • the fifth light guide section 125 extends from the fifth joint surface 115 of the incident section 110 to the position of the fifth reflective surface 124b of the fourth light guide section 124 and the position of the sixth reflective surface 124c. It is formed integrally with the light section 124. That is, the portion from the seventh reflective surface 125b of the fifth light guide section 125 to the sixth reflective surface 124c of the fourth light guide section 124 is formed integrally with the fourth light guide section 124.
  • the eighth reflective surface 125c of the fifth light guide section 125 is extended by a distance of 2 times the length W in the X-axis direction of the fifth output surface 125a from the position of the sixth reflective surface 124c of the fourth light guide section 124 . It is located away from the other end in the axial direction. That is, the distance between the seventh reflective surface 125b and the eighth reflective surface 125c along the X-axis direction is the It is twice the distance W 1 along the axial direction, that is, shorter than 2W 1 (W 1 +W 2 ).
  • a common light guide section has a shape in which two fourth light guide sections 124 are arranged in parallel in the Z-axis direction. From the position of the fifth reflective surface 124b of the fourth light guide section 124 to the position of the sixth reflective surface 124c, the boundary surface between the fourth light guide section 124 and the fifth light guide section 125 is physically a boundary. It does not have a surface, but a virtual surface.
  • the light emitting surface of the collective light guide section 120 has the first to fifth emitting surfaces 121a to 125a, so that the light from the light source 1 can be utilized.
  • the point that the length of the side in the Z-axis direction of the output surface of the collective light guide section 120 can be reduced without reducing efficiency will be explained.
  • the apparent size of a light source is defined by "Abbe's invariant,” which is determined by the product of the divergence angle of the light source in a certain direction and the length of the side of the light source in that direction.
  • the height of the light source that is, the length in the vertical direction
  • the vertical divergence angle of light from the light source is ⁇ 0
  • the length in the vertical direction of the emission surface that is, the length of the vertical side.
  • the apparent height of the light source can be reduced. Since the light from the light source 1 is collimated by the incident part 110 and divided into five light beams, the length of the side in the Z-axis direction of the output surface of the collective light guide part 120 can be reduced, and the first output surface The length of the side in the Z-axis direction of the fifth output surface 125a from 121a can be reduced. In the headlamp module according to Embodiment 1, the height of the projection surface can be reduced, allowing for reduction in thickness and size.
  • the light distribution forming section 200 has a first projection surface 231a to a third projection surface 233a located along the X-axis direction.
  • the light in the Y-axis direction from 121a to the fifth output surface 125a) is totally reflected forward and downward in the Z-axis direction and guided from the first projection surface 231a to the third projection surface 233a.
  • the light distribution forming section 200 includes a collective light collecting optical section 210, a collective light distribution section 220, and a projection section 230.
  • the light distribution forming section 200 is integrally formed of a transparent material.
  • the collective light condensing optical section 210 totally reflects the light from the output surfaces (first output surface 121a to fifth output surface 125a) of the collective light guide section 120 forward and downward in the Z-axis direction and condenses the light. .
  • the collective light collecting optical part 210 is formed integrally with the collective light guiding part 120.
  • the collective light collecting optical part 210 includes a first light collecting optical part 211 to a fifth light collecting optical part 215.
  • the first condensing optical section 211 to the fifth condensing optical section 215 are arranged from the other end side along the X-axis to the fifth condensing optical section 215, the fourth condensing optical section 214, and the first condensing optical section 215.
  • a condensing optical section 211, a second condensing optical section 212, and a third condensing optical section 213 are arranged in this order.
  • the first condensing optical part 211 has a joint surface that joins with the first output surface 121a of the first light guide part 121, and a joint surface that faces the joint surface and is located on one end side of the Z axis with respect to the joint surface. It has a reflecting surface that is tilted forward and has a light gathering function, a pair of parallel opposing surfaces along the X-axis, and a front surface located at one end of the Z-axis that serves as an exit for the light reflected on the reflecting surface. .
  • the length of the joint surface of the first condensing optical section 211 along the X axis, the distance between the pair of opposing surfaces of the first condensing optical section 211, and the front surface of the first condensing optical section 211 The length along the X-axis is W, which is the same as the length W in the X-axis direction of the first output surface 121a.
  • the reflective surface is a flat surface having an inclination of less than 45 degrees in front of the cemented surface, and may be a curved surface depending on the application.
  • the first condensing optical section 211 totally reflects the light from the first output surface 121a of the first light guiding section 121 forward and downward in the Z-axis direction by the reflecting surface and condenses the light. Note that the joint surface of the first condensing optical section 211 and the first output surface 121a of the first light guide section 121 are not physically joined surfaces but are virtual surfaces.
  • the second condensing optical part 212 has a joint surface that joins with the second output surface 122a of the second light guide part 122, and a joint surface that faces the joint surface and is located on one end side of the Z axis with respect to the joint surface. It has a reflecting surface that is tilted forward and has a light condensing function, a pair of parallel opposing surfaces along the X-axis, and a front surface located at one end of the Z-axis that serves as an exit for light reflected by the reflecting surface.
  • the length of the joint surface of the second condensing optical section 212 along the X axis, the distance between the pair of opposing surfaces of the second condensing optical section 212, and The length along the X-axis is W 1 , which is the same as the length W 1 in the X-axis direction of the second exit surface 122a.
  • the reflecting surface is a flat surface having an inclination of less than 45 degrees in front of the cemented surface, and may be a curved surface depending on the application.
  • the second condensing optical section 212 totally reflects the light from the second output surface 122a of the second light guide section 122 forward and downward in the Z-axis direction by a reflecting surface and condenses the light. Note that the joint surface of the second condensing optical section 212 and the second output surface 122a of the second light guide section 122 are not physically joined surfaces but are virtual surfaces.
  • the third condensing optical part 213 has a joint surface that joins with the third output surface 123a of the third light guide part 123, and a joint surface that faces the joint surface and is located on one end side of the Z axis with respect to the joint surface. It has a reflecting surface that is tilted forward and has a light condensing function, a pair of parallel opposing surfaces along the X-axis, and a front surface located on one end side of the Z-axis that serves as an exit for the light reflected by the reflecting surface.
  • the length of the joint surface of the third condensing optical section 213 along the X axis, the distance between the pair of opposing surfaces of the third condensing optical section 213, and The length along the X-axis is W2 , which is the same as the length W2 in the X-axis direction at the third exit surface 123a.
  • the reflective surface is a flat surface that is inclined forward at less than 45 degrees with respect to the cemented surface, and may be a curved surface depending on the application.
  • the reflective surface of the third condensing optical unit 213 is inclined toward the ⁇ direction of the X-axis, that is, toward the second projection lens 232.
  • the third condensing optical section 213 totally reflects the light from the third output surface 123a of the third light guide section 123 toward the front in the Z-axis direction and then downward toward the center using a reflective surface. to focus the light.
  • the joint surface of the third condensing optical section 213 and the third output surface 123a of the third light guide section 123 are not physically joined surfaces but virtual surfaces. be.
  • the fourth condensing optical part 214 has a joint surface that joins with the fourth output surface 124a of the fourth light guide part 124, and is opposite to the joint surface and is located on one end side of the Z axis with respect to the joint surface. It has a reflecting surface that is tilted forward and has a light condensing function, a pair of parallel opposing surfaces along the X-axis, and a front surface located on one end side of the Z-axis that serves as an exit for the light reflected by the reflecting surface.
  • the length along the X-axis is W 1 , which is the same as the length W 1 in the X-axis direction of the fourth output surface 124a.
  • the reflective surface is a flat surface that is inclined forward at less than 45 degrees with respect to the cemented surface, and may be a curved surface depending on the application.
  • the fourth condensing optical section 214 totally reflects the light from the fourth output surface 124a of the fourth light guide section 124 forward and downward in the Z-axis direction by the reflecting surface and condenses the light. Note that in the first embodiment, the joint surface of the fourth condensing optical section 214 and the fourth output surface 124a of the fourth light guide section 124 are not physically joined surfaces but virtual surfaces. be.
  • the fifth condensing optical part 215 has a joint surface that joins with the fifth output surface 125a of the fifth light guide part 125, and a joint surface that faces the joint surface and is located on one end side of the Z axis with respect to the joint surface. It has a reflecting surface that is tilted forward and has a light condensing function, a pair of opposing surfaces along the X-axis, and a front surface located at one end of the Z-axis that serves as an exit for light reflected by the reflecting surface.
  • the length along the X-axis is W2 , which is the same as the length W2 in the X-axis direction of the fifth exit surface 125a.
  • the reflective surface is a flat surface having an inclination of less than 45 degrees in front of the cemented surface, and may be a curved surface depending on the application.
  • the reflective surface of the fifth condensing optical section 215 is inclined toward the + direction of the X-axis, that is, toward the third projection lens 233.
  • the fifth condensing optical section 215 totally reflects the light from the fifth output surface 125a of the fifth light guiding section 125 downward in the front direction in the Z-axis direction and toward the center using the reflective surface. to focus the light.
  • the joint surface of the fifth condensing optical section 215 and the fifth output surface 125a of the fifth light guide section 125 are not physically joined surfaces but virtual surfaces. be.
  • each of the first condensing optical section 211 to the fifth condensing optical section 215 a reflective surface having a light condensing function, it is possible to easily achieve the complex light distribution required for the headlamp device. can be formed.
  • the collective light distribution section 220 directs the light beams (the first light beam L1 to the fifth light beam L5) totally reflected and condensed by the collective light condensing optical section 210 to the projection surface (the first projection surface 231a to the third projection surface 231a). 233a).
  • the collective light distribution section 220 is formed integrally with the collective light collecting optical section 210.
  • the collective light distribution section 220 has a cut-off line forming surface 220a having a ridge line for forming a cut-off line along the X-axis direction on the bottom surface, that is, a surface located on the incident section 110 side in the Y-axis direction.
  • the area from the ridgeline of the offline forming surface 220a to the front surface of the collective condensing optical part 210 is the first area part 220A, and the area from the ridgeline of the cutoff line forming surface 220a to the projection part 230 is the second area part 220B.
  • the bottom surface is a horizontal surface along the ZX plane, and the top surface opposite to the bottom surface is also a horizontal surface along the ZX plane.
  • the bottom surface is made to be a surface that slopes toward the Z-axis direction with respect to the Z-X plane, and the top surface is also made to be a surface that is sloped toward the Z-axis direction with respect to the Z-X plane. good.
  • at least one of the bottom surface and the top surface may be changed to a surface parallel to the ZX plane.
  • a cut-off line forming surface 220a which is a reflective surface, is provided on the bottom surface of the first region portion 220A.
  • the collective light distribution section 220 totally reflects the light from the front surface of the collective light condensing optical section 210 by a cut-off line forming surface 220a, which is a reflecting surface, and transmits the light with a cut-off line formed through the second area section 220B. and propagates to the projection section 230.
  • the collective light distribution section 220 directs some of the light to a cutoff line, as shown in FIG.
  • the light is reflected by the forming surface 221a and guided to the first projection surface 231a, and other light is guided directly to the first projection surface 231a.
  • cutoff light distribution is projected from the first projection surface 231a.
  • the bottom surface and top surface of the second region section 220B are also horizontal surfaces along the Z-X plane like the bottom surface and top surface of the first region section 220A, but the bottom surface and the top surface of the second region section 220B are horizontal planes along the Z-X plane. It may be a surface with an inclination or a surface parallel to the ZX plane.
  • the collective light distribution section 220 includes a first light distribution section 221 to a fifth light distribution section 225.
  • the first light distribution section 221 to the fifth light distribution section 225 are arranged in order from the other end along the X axis: the fifth light distribution section 225, the fourth light distribution section 224, the first light distribution section 221. , the second light distribution section 222, and the third light distribution section 223 are arranged in this order and formed integrally. Adjacent light distribution parts are not physically joined. Opposing surfaces in adjacent light distribution sections are virtual surfaces.
  • the first light distribution section 221 transmits the light from the luminous flux L1 totally reflected and condensed from the front surface of the first condensing optical section 211 to the first projection surface 231a of the first projection lens 231 in the projection section 230. lead to.
  • the joining surface between the first light distribution section 221 and the front surface of the first condensing optical section 211 is not a physically joined surface but a virtual surface.
  • the width of the first light distribution section 221 along the X-axis is W, which is the same as the length W of the first light output surface 121a in the X-axis direction.
  • the first light distribution section 221 has a first cutoff line forming surface 221a having a ridgeline for forming a cutoff line along the X-axis direction.
  • the area from the ridgeline of the first cut-off line forming surface 221a to the front surface of the first condensing optical section 211 is the first area portion 221A
  • the area from the ridge line of the first cut-off line forming surface 221a to the first projection lens 231 is the first area portion 221A.
  • the bottom surface is a surface located on the incident section 110 side, and is a horizontal surface along the ZX plane.
  • the upper surface is also a horizontal plane along the ZX plane.
  • a first cut-off line forming surface 221a which is a reflective surface, is provided on the bottom surface of the first region portion 221A.
  • the length in the X-axis direction that is, the interval between the pair of opposing surfaces facing each other parallel to the X-axis direction is W.
  • a portion of the light beam L1 from the front surface of the first condensing optical section 211 is reflected by the first cut-off line forming surface 221a.
  • the light reflected by the first cutoff line forming surface 221a and on which the cutoff line has been formed is guided to the first projection lens 231 via the second region portion 221B.
  • the other light of the luminous flux L1 from the front surface of the first condensing optical section 211 is not reflected by the first cut-off line forming surface 221a, and is transmitted to the first projection via the second region section 221B. It is guided directly to the lens 231.
  • the light reflected by the first cut-off line forming surface 221a and the light not reflected by the first cut-off line forming surface 221a are combined, a cut-off light distribution is formed, and a low beam is emitted from the first projection lens 231. Projected.
  • the second light distribution section 222 guides the light of the luminous flux L2 totally reflected and condensed from the front surface of the second condensing optical section 212 to the second projection surface 232a of the projection section 230.
  • the joint surface between the second light distribution section 222 and the front surface of the second condensing optical section 212 is not a physically joined surface but a virtual surface.
  • the width of the second light distribution section 222 along the X-axis is W1 , which is the same as the length W1 of the second light output surface 122a in the X-axis direction.
  • the second light distribution section 222 has a second cut-off line forming surface 222a having a ridgeline for forming a cut-off line along the X-axis direction.
  • the area from the ridgeline of the second cut-off line forming surface 222a to the front surface of the second condensing optical section 212 is the first area portion 222A
  • the area from the ridge line of the second cut-off line forming surface 222a to the second projection lens 232 is the first area portion 222A.
  • the bottom surface is a surface located on the incident section 110 side, and is a horizontal surface along the ZX plane.
  • the upper surface is also a horizontal plane along the ZX plane.
  • a second cut-off line forming surface 222a which is a reflective surface, is provided on the bottom surface of the first region portion 222A.
  • the length in the X-axis direction that is, the interval between the pair of opposing surfaces that face each other parallel to the X-axis direction is W1 .
  • a portion of the light beam L2 from the front surface of the second condensing optical section 212 is reflected by the second cut-off line forming surface 222a.
  • the light reflected by the second cutoff line forming surface 222a and on which the cutoff line has been formed is guided to the second projection lens 232 via the second region portion 222B.
  • the other light of the luminous flux L2 from the front surface of the second condensing optical section 212 is not reflected by the second cut-off line forming surface 222a and is transmitted to the second projection via the second region section 222B. It is guided directly to lens 232.
  • the light reflected by the second cut-off line forming surface 222a and the light not reflected by the first cut-off line forming surface 222a are combined, a cut-off light distribution is formed, and a low beam is emitted from the second projection lens 232. Projected.
  • the third light distribution section 223 guides the light of the luminous flux L3 totally reflected and condensed from the front surface of the third condensing optical section 213 to the second projection surface 232a of the projection section 230.
  • the joint surface between the third light distribution section 223 and the front surface of the third condensing optical section 213 is not a physically joined surface but a virtual surface.
  • the third light distribution section 223 overlaps with the second light distribution section 222 as it approaches the second projection surface 232a, and the overlapping portion becomes a common portion.
  • the third light distribution section 223 has a third cut-off line forming surface 223a having a ridgeline for forming a cut-off line along the X-axis direction.
  • the area from the ridgeline of the third cut-off line forming surface 223a to the front surface of the third condensing optical section 213 is the first area portion 223A
  • the area from the ridge line of the third cut-off line forming surface 223a to the second projection lens 232 is the first area portion 223A.
  • the bottom surface is a surface located on the incident section 110 side, and is a horizontal surface along the ZX plane.
  • the upper surface is also a horizontal plane along the ZX plane.
  • a third cut-off line forming surface 223a which is a reflective surface, is provided on the bottom surface of the first region portion 223A.
  • the length in the X-axis direction that is, the interval between the pair of opposing surfaces that face each other parallel to the X-axis direction is W2 .
  • the first region portion 223A overlaps with the first region portion 222A on the center side, and the overlapping portion becomes a common portion.
  • the second region portion 223B overlaps with the second region portion 222B on the center side, the overlapping portion is a common portion, and the cemented surface with the second projection lens 232 is the second projection lens in the second region portion 222B. It is located at the center of the cemented surface with the lens 232, at a width W2 .
  • the boundary between the third light distribution section 223 and the second light distribution section 222 is virtual, and the third light distribution section 223 follows the optical path of the light beam L3 from the third condensing optical section 213.
  • the second light distribution section 222 indicates the optical path of the light beam L2 from the second condensing optical section 212.
  • a portion of the light beam L3 from the front surface of the third condensing optical section 213 is reflected by the third cut-off line forming surface 223a.
  • the light reflected by the third cutoff line forming surface 223a and on which the cutoff line has been formed is guided to the second projection lens 232 via the second area portion 223B.
  • the other light of the luminous flux L3 from the front surface of the third condensing optical section 213 is not reflected by the third cut-off line forming surface 223a and is transmitted to the second projection via the second region section 223B. It is guided directly to lens 232.
  • the light reflected by the third cut-off line forming surface 223a and the light not reflected by the third cut-off line forming surface 223a are combined, a cut-off light distribution is formed, and a low beam is emitted from the second projection lens 232. Projected. Note that the light beam L3 is combined with the light beam L2 guided from the second light distribution section 222 and projected as a low beam from the second projection lens 232.
  • the fourth light distribution section 224 guides the light beam L4 that is totally reflected and condensed from the front surface of the fourth condensing optical section 214 to the third projection surface 233a of the projection section 230.
  • the joint surface between the fourth light distribution section 224 and the front surface of the fourth condensing optical section 214 is not a physically joined surface but a virtual surface.
  • the width of the fourth light distribution section 224 along the X-axis is W1 , which is the same as the length W1 of the fourth light output surface 124a in the X-axis direction.
  • the fourth light distribution section 224 has a fourth cut-off line forming surface 224a having a ridgeline for forming a cut-off line along the X-axis direction.
  • the area from the ridgeline of the fourth cut-off line forming surface 224a to the front surface of the fourth condensing optical section 214 is the first area portion 224A
  • the area from the ridge line of the fourth cut-off line forming surface 224a to the third projection lens 233 is the first area portion 224A.
  • the bottom surface is a surface located on the incident section 110 side, and is a horizontal surface along the ZX plane.
  • the upper surface is also a horizontal plane along the ZX plane.
  • a fourth cut-off line forming surface 224a which is a reflective surface, is provided on the bottom surface of the first region portion 224A.
  • the length in the X-axis direction that is, the interval between the pair of opposing surfaces that face each other parallel to the X-axis direction is W1 .
  • a portion of the light beam L4 from the front surface of the fourth condensing optical unit 214 is reflected by the fourth cut-off line forming surface 224a.
  • the light reflected by the fourth cutoff line forming surface 224a and on which the cutoff line has been formed is guided to the third projection lens 233 via the second region portion 224B.
  • the other light of the luminous flux L4 from the front surface of the fourth condensing optical section 214 is not reflected by the fourth cut-off line forming surface 224a, and is transmitted to the third projection via the second region section 224B. It is guided directly to the lens 233.
  • the light reflected by the fourth cut-off line forming surface 224a and the light not reflected by the fourth cut-off line forming surface 224a are combined, a cut-off light distribution is formed, and a low beam is emitted from the third projection lens 233. Projected.
  • the fifth light distribution section 225 guides the light beam L5 that is totally reflected and condensed from the front surface of the fifth condensing optical section 215 to the third projection surface 233a of the projection section 230.
  • the joint surface between the fifth light distribution section 225 and the front surface of the fifth condensing optical section 215 is not a physically joined surface but a virtual surface.
  • the fifth light distribution section 225 approaches the third projection surface 233a, it overlaps with the fourth light distribution section 224, and the overlapping portion becomes a common portion.
  • the fifth light distribution section 225 has a fifth cut-off line forming surface 225a having a ridgeline for forming a cut-off line along the X-axis direction.
  • the area from the ridge line of the fifth cut-off line forming surface 225a to the front surface of the fifth condensing optical unit 215 is the first area portion 225A
  • the area from the ridge line of the fifth cut-off line forming surface 225a to the fifth projection lens 235 is the first area portion 225A.
  • the bottom surface is a surface located on the incident section 110 side, and is a horizontal surface along the ZX plane.
  • the upper surface is also a horizontal plane along the ZX plane.
  • a fifth cutoff line forming surface 225a which is a reflective surface, is provided on the bottom surface of the first region portion 225A.
  • the length in the X-axis direction that is, the interval between the pair of opposing surfaces that face each other parallel to the X-axis direction is W2 .
  • the first region portion 225A overlaps with the first region portion 224A on the center side, and the overlapping portion becomes a common portion.
  • the second region portion 225B overlaps with the second region portion 224B on the center side, the overlapping portion is a common portion, and the joint surface with the third projection lens 233 is the third projection in the second region portion 224B. It is located at the center of the cemented surface with the lens 233, at a width W2 . Note that the boundary between the fifth light distribution section 225 and the fourth light distribution section 224 is virtual, and the fifth light distribution section 225 follows the optical path of the light beam L5 from the fifth condensing optical section 215.
  • the fourth light distribution section 224 indicates the optical path of the light beam L4 from the fourth condensing optical section 214.
  • a portion of the light beam L5 from the front surface of the fifth condensing optical section 215 is reflected by the fifth cut-off line forming surface 225a.
  • the light reflected by the fifth cutoff line forming surface 225a and on which the cutoff line has been formed is guided to the third projection lens 233 via the second area portion 225B.
  • the other light of the luminous flux L5 from the front surface of the fifth condensing optical section 215 is not reflected by the fifth cut-off line forming surface 225a, and is transmitted to the third projection via the second region section 225B. It is guided directly to the lens 233.
  • the light reflected by the fifth cut-off line forming surface 225a and the light not reflected by the fifth cut-off line forming surface 225a are combined to form a cut-off light distribution, which is transmitted as a low beam from the third projection lens 233. Projected. Note that the light beam L5 is combined with the light beam L4 guided from the fourth light distribution section 224 and projected as a low beam from the third projection lens 233.
  • the ridgeline for forming the cutoff line of each of the cutoff line forming surfaces 221a to 225a is the underline at the joint surface of each of the first region portions 221A to 225A and each of the second region portions 221B to 225B, that is, the first region portion. These are the front end sides of the cut-off line forming surfaces 221a to 225a on the bottom surfaces of the bottom surfaces 221A to 225A, respectively.
  • the ridge line for forming the cut-off line is positioned so that the upper side, that is, the outside of the light distribution pattern, is dark, and the lower side, that is, the inside of the light distribution pattern, is bright.
  • the projection section 230 has a first projection surface 231a to a third projection surface 233a, and projects the light guided as a luminous flux by the collective light distribution section 220 from the first projection surface 231a to the third projection surface 233a. .
  • the projection section 230 is formed integrally with the collective light distribution section 220.
  • the projection unit 230 includes a first projection lens 231 to a third projection lens 233.
  • the first projection lens 231 to the third projection lens 233 are arranged in the order of the third projection lens 233, the first projection lens 231, and the second projection lens 232 from the other end side along the X axis. .
  • the first projection lens 231 has a first projection surface 231a, and projects the light guided as a luminous flux L1 by the first light distribution section 221 forward as low beam irradiation light from the first projection surface 231a.
  • the first projection lens 231 is a convex lens having a convex first projection surface 231a on its surface. By focusing the convex lens on the ridgeline of the first cutoff line forming surface 221a, the formed cutoff light distribution can be projected. Note that the surface of the first projection lens 231 may be a concave lens.
  • the joint surface between the first projection lens 231 and the first light distribution section 221 is not a physically joined surface but a virtual surface.
  • the length of the first projection lens 231 in the X-axis direction is W, which is the same as the interval W of the first exit surface 121a along the X-axis direction.
  • the second projection lens 232 has a second projection surface 232a, and combines the light guided as a luminous flux L2 by the second light distribution section 222 and the light guided as a luminous flux L3 by the third light distribution section 223. Then, it is projected forward as low beam irradiation light from the second projection surface 232a.
  • the second projection lens 232 is a convex lens having a convex second projection surface 232a on its surface. By focusing the convex lens on the ridgeline of the second cutoff line forming surface 222a, the formed cutoff light distribution can be projected. Note that the surface of the second projection lens 232 may be a concave lens.
  • the joint surface between the second projection lens 232, the second light distribution section 222, and the third light distribution section 223 is not a physically joined surface but a virtual surface.
  • the length of the second projection lens 232 in the X-axis direction is W1 , which is the same as the interval W1 of the second exit surface 122a along the X-axis direction.
  • the third projection lens 233 has a third projection surface 233a, and combines the light guided as a luminous flux L4 by the fourth light distribution section 224 and the light guided as a luminous flux L5 by the fifth light distribution section 225. Then, it is projected forward as low beam irradiation light from the third projection surface 233a.
  • the third projection lens 233 is a convex lens having a convex third projection surface 233a on its surface. By focusing the convex lens on the ridgeline of the fourth cutoff line forming surface 224a, the formed cutoff light distribution can be projected. Note that the surface of the third projection lens 233 may be a concave lens.
  • the joint surface between the third projection lens 233, the fourth light distribution section 224, and the fifth light distribution section 225 is not a physically joined surface but a virtual surface.
  • the length of the third projection lens 233 in the X-axis direction is W1 , which is the same as the interval W1 of the fourth exit surface 124a along the X-axis direction.
  • the total length in the X-axis direction from the first projection surface 231a to the third projection surface 233a arranged in a line along the X-axis is (W+2W 1 ).
  • a first projection surface to a fifth projection surface are provided for each of the first to fifth projection surfaces 121a to 125a, and the length of each of the first to fifth projection surfaces in the X-axis direction is When the length is W, the total length in the X-axis direction from the first projection surface to the fifth projection surface is 5W, but in the first embodiment, it is shorter by 4W- 2W .
  • each of the first to third projection lenses 231 to 233 may be a concave lens having a concave projection surface on its surface.
  • the light guided from the first joint surface 111 of the entrance section 110 to the first light guide section 121 is directed along the Y axis to the first exit surface 121a, as shown as a light beam L1 in FIGS. 10 to 12.
  • the light that travels straight and reaches the reflective surface of the first condensing optical section 211 is totally reflected and condensed by the reflective surface of the first condensing optical section 211 forward in the Z-axis direction and downward. , propagates within the first light distribution section 221.
  • the first cut-off line forming surface 221a totally reflects the light beam L1 from the front surface of the first condensing optical section 211 to form a cut-off line.
  • the light is guided to the first projection lens 231 via the second area portion 221B.
  • the light beam L1 with a cutoff line formed therein reaches the first projection lens 231 and is focused by the first projection lens 231 and emitted forward as low beam irradiation light.
  • the light guided from the second bonding surface 112 of the incident section 110 to the second light guiding section 122 is directed along the Y axis to the first reflecting surface 122b, as shown as a luminous flux L2 in FIGS. 10 to 12.
  • the light that travels straight and reaches the first reflective surface 122b is totally reflected by the first reflective surface 122b at right angles to one end side in the X-axis direction.
  • the light that is totally reflected at right angles by the first reflective surface 122b and reaches the second reflective surface 122c is totally reflected at right angles by the second reflective surface 122c, and is directed to the second output surface 122a along the Y axis.
  • the light is guided and reaches the reflective surface of the second condensing optical section 212.
  • the light that has reached the reflective surface of the second condensing optical section 212 is totally reflected forward in the Z-axis direction and downward by the reflective surface of the second condensing optical section 212, and is condensed.
  • the light is propagated within the light distribution section 222 of.
  • the second cut-off line forming surface 222a totally reflects the light beam L2 from the front surface of the second condensing optical section 212 to form a cut-off line.
  • the light is guided to the second projection lens 232 via the second area portion 222B.
  • the light beam L2 with a cut-off line that has reached the second projection lens 232 is focused by the second projection lens 232 and is emitted forward as low beam irradiation light.
  • the light guided from the third joint surface 113 of the incident section 110 to the third light guide section 123 is directed along the Y axis to the third reflective surface 123b, as shown as a light beam L3 in FIGS. 10 to 12.
  • the light that travels straight and reaches the third reflective surface 123b is totally reflected by the third reflective surface 123b at right angles to one end side in the X-axis direction.
  • the light that is totally reflected at right angles by the third reflective surface 123b and reaches the fourth reflective surface 123c is totally reflected at right angles by the fourth reflective surface 123c, and travels along the Y-axis to the third output surface 123a.
  • the light is guided and reaches the reflective surface of the third condensing optical section 213.
  • a part of the light that reaches the reflective surface of the third condensing optical section 213 is directed forward in the Z-axis direction and toward the center by the reflective surface of the third condensing optical section 213.
  • the light is totally reflected downward, condensed, and propagated within the third light distribution section 223.
  • part of the light of the luminous flux L3 from the front surface of the third condensing optical section 213 is totally reflected by the third cut-off line forming surface 223a.
  • the light beam L3 reflected by the third cutoff line forming surface 223a and forming a cutoff line is guided to the second projection lens 232 via the second area portion 223B.
  • the other light among the lights that have reached the reflective surface of the third condensing optical section 213 is directed forward in the Z-axis direction and toward the center by the reflective surface of the second condensing optical section 213.
  • the light is totally reflected downward, condensed, and propagated within the second light distribution section 222.
  • the other light of the light beam L3 from the front surface of the third condensing optical section 213 is reflected by the second cut-off line forming surface 222a.
  • the light beam L3 reflected by the second cutoff line forming surface 222a and forming a cutoff line is guided to the second projection lens 232 via the second area portion 223B.
  • the light beam L3 with a cut-off line that has reached the second projection lens 232 is guided from the second light distribution section 222 by the second projection lens 232 and is combined with the light beam L2 with a cut-off line formed.
  • the lights are combined, focused, and emitted forward as low beam illumination light.
  • the light guided from the fourth joint surface 114 of the entrance section 110 to the fourth light guide section 124 is directed along the Y axis to the fifth reflective surface 124b, as shown as a light beam L4 in FIGS. 10 to 12.
  • the light that travels straight and reaches the fifth reflective surface 124b is totally reflected by the fifth reflective surface 124b at a right angle toward the other end in the X-axis direction.
  • the light that is totally reflected at right angles by the fifth reflecting surface 124b and reaches the sixth reflecting surface 124c is totally reflected at right angles by the sixth reflecting surface 124c and travels along the Y-axis to the fourth output surface 124a.
  • the light is guided and reaches the reflective surface of the fourth condensing optical section 214.
  • the light reaching the reflective surface of the fourth condensing optical section 214 is totally reflected forward in the Z-axis direction and downward by the reflective surface of the fourth condensing optical section 214, and is condensed.
  • the light is propagated within the light distribution section 224 of.
  • the fourth cut-off line forming surface 224a totally reflects the light beam L4 from the front surface of the fourth condensing optical section 214 to form a cut-off line.
  • the light is guided to the third projection lens 233 via the second area portion 224B.
  • the light beam L4 having a cutoff line that has reached the third projection lens 233 is focused by the third projection lens 233 and is emitted forward as low beam irradiation light.
  • the light guided from the fifth joint surface 115 of the incident section 110 to the fifth light guiding section 125 is directed along the Y axis to the seventh reflecting surface 125b, as shown as a light beam L5 in FIGS. 10 to 12.
  • the light that travels straight and reaches the seventh reflective surface 125b is totally reflected by the seventh reflective surface 125b at a right angle toward the other end in the X-axis direction.
  • the light that is totally reflected at right angles by the seventh reflective surface 125b and reaches the eighth reflective surface 125c is totally reflected at right angles by the eighth reflective surface 125c, and travels along the Y-axis to the fifth output surface 125a.
  • the light is guided and reaches the reflective surface of the fifth condensing optical section 215.
  • Some of the light that has reached the reflective surface of the fifth condensing optical section 215 is directed forward in the Z-axis direction and toward the center by the reflective surface of the fifth condensing optical section 215.
  • the light is totally reflected downward, condensed, and propagated within the fifth light distribution section 225.
  • part of the light of the luminous flux L5 from the front surface of the fifth condensing optical section 215 is totally reflected by the fifth cut-off line forming surface 225a.
  • the light beam L5 reflected by the fifth cutoff line forming surface 225a and forming a cutoff line is guided to the third projection lens 233 via the second area portion 225B.
  • the other light of the light that has reached the reflective surface of the fifth condensing optical section 215 is directed forward in the Z-axis direction and toward the center by the reflective surface of the fifth condensing optical section 215.
  • the light is totally reflected downward, condensed, and propagated within the fourth light distribution section 224.
  • the other light of the light beam L5 from the front surface of the fifth condensing optical section 215 is reflected by the fourth cut-off line forming surface 224a.
  • the light beam L5 reflected by the fourth cutoff line forming surface 224a and forming a cutoff line is guided to the third projection lens 233 via the second area portion 224B.
  • the light beam L5 with a cut-off line that has reached the third projection lens 233 is guided from the fourth light distribution section 224 by the third projection lens 233 to form a cut-off line, and is combined with the light beam L4. It is then focused and emitted forward as low beam illumination light.
  • the headlamp module includes an entrance section 110, a collective light guide section 120, and a light distribution forming section 200, and the collective light guide section 120 connects a plurality of junctions of the entrance section 110. It has a plurality of output surfaces corresponding to each surface and located along one direction and the other direction perpendicular to the plane perpendicular to the optical axis of the light source 1, each of which transmits light from the corresponding joint surface to the corresponding output surface.
  • the light distribution forming part has at least one projection surface located along the other direction, and the light from the plurality of exit surfaces is reflected to one end side in one direction and guided to the projection surface, and the light distribution forming section has at least one projection surface located along the other direction.
  • the width in the X-axis direction can be narrowed and downsized, and the light from multiple output surfaces Since the light is projected onto a smaller number of projection surfaces than the plurality of output surfaces, it is easy to form a light distribution pattern of the light projected from the projection surfaces.
  • the headlamp module includes a light source distribution element 100 and a light distribution forming section 200, and the light source distribution element 100 receives light from the light source 1, and the light from the first output surface 121a to the fifth
  • the first to fifth output surfaces 125a do not overlap in the Z-axis direction (traveling direction) and the X-axis direction (left-right direction), and are arranged from one end side in the X-axis direction.
  • the third output surface 123a, the second output surface 122a, the first output surface 121a, the fourth output surface 124a, and the fifth output surface 125a are arranged in the order of the other end side, and the light incident from the light source 1 is guided from the first output surface 121a to the fifth output surface 125a, and the light distribution forming part 200 has a first projection surface 231a located along the X-axis direction to a third projection surface 233a, and the light source distribution Since the light from the first output surface 121a to the fifth output surface 125a of the element 100 is totally reflected forward in the Z-axis direction and guided from the first projection surface 231a to the third projection surface 233a, The width of the first projection surface 231a can be reduced to achieve miniaturization, and the light from the first exit surface 121a to the fifth exit surface 125a is projected from the first projection surface 231a to the third projection surface 233a. It is easy to form a light distribution pattern of light projected from the projection surface 231a to the
  • the light distribution forming section 200 has a cutoff line forming surface 220a having a ridge line for forming a cutoff line along the other direction
  • the light distribution forming section 200 has a cutoff line forming surface 220a having a ridge line for forming a cutoff line along the other direction
  • a part of the light is reflected by the cut-off line forming surface 220a and guided to the projection surface, and the other light from the collective light guide section 120 is directly guided to the projection surface, thereby projecting a cut-off light distribution.
  • the width in the X-axis direction is narrowed, the size can be reduced, and the light distribution pattern of the light projected from the projection surface can be easily formed.
  • the light distribution forming section 200 includes a collective light collecting optical section 210 having a first light collecting optical section 211 to a fifth light collecting optical section 215, and a first light distribution section.
  • a collective light distribution section 220 having a fifth light distribution section 221 to 225;
  • a projection section having a first projection lens 231 having a first projection surface 231a to a third projection lens 233 having a third projection surface 233a;
  • each of the first light distribution section 221 to the fifth light distribution section 225 has cutoff line forming surfaces 221a to 225a having ridgelines for forming a cutoff line along the X-axis direction
  • the light distribution unit 221 guides the light beam L1 from the first condensing optical unit 211 to the first projection lens 231 as the light beam L1 with a cutoff line formed, and the second light distribution unit 222
  • the light beam L2 from the second condensing optical section 212 is guided to the second projection lens 232 as the light beam L2
  • the fifth light distribution unit 225 guides the light beam L4 from the fifth condensing optical unit 215 to the third projection lens 233 as a light beam L4 with a cutoff line formed therein, and the fifth light distribution unit 225 converts the light beam L5 from the fifth condensing optical unit 215 into a light beam with a cutoff line formed. Since the light of L5 is guided to the third projection lens 233, the structure can be simplified and the width in the X-axis direction can be narrowed to achieve miniaturization, and the light projected from the first projection surface 231a to the third projection surface 233a It is easy to form a light distribution pattern.
  • the light source distribution element 100 includes a first light guide section 121 having an incident section 110 and a first output surface 121a to a fifth light guide section having a fifth output surface 125a.
  • the second light guide part 122 and the third light guide part 123 each have a pair of opposing surfaces that connect to the corresponding joint surface of the incident part 110 on one end side in the X-axis direction. It has a pair of reflective surfaces 122b, 122c, 123b, and 123c inclined at 45 degrees with respect to 112 and 113, and the pair of opposing surfaces of each of the fourth light guide section 124 and the fifth light guide section 125 are in the X-axis direction.
  • the other end side has a pair of reflective surfaces 124b, 124c, 125b, 125c that are inclined at 45 degrees with respect to the corresponding bonding surfaces 114, 115 of the incident section 110. Since the light section 125 branches the incident light beam into the incident section 110 from the first output surface 121a to the fifth output surface 125a, the light beam is emitted from the first output surface 121a, which is the light emission reference surface.
  • the apparent size of the light source in the division direction with respect to the fifth output surface 125a, that is, in the Z-axis direction, can be made smaller.
  • the light source distribution element 100 can be made thinner in the Z-axis direction by simplifying the structure without deteriorating the light utilization efficiency of the light source distribution element 100, and as a result, the headlamp module can be The length in the height direction from the first projection surface 231a to the third projection surface 233a can be reduced, and the structure can be simplified and the thickness can be reduced in the height direction without reducing the light utilization efficiency.
  • the light source distribution element 100 and the light distribution forming section 200 are integrally formed using a transparent material, so that light is projected from the first projection surface 231a to the third projection surface 233a. It is resistant to variations in placement accuracy with respect to light flux and is easy to handle. Further, by integrally forming the structure, loss due to Fresnel reflection can be reduced.
  • the headlight module according to Embodiment 1 is used as an element of a low beam automobile headlamp device, and a plurality of headlight modules according to Embodiment 1 are arranged in parallel in the other direction, in the left and right direction with respect to the automobile. It may be placed in
  • Embodiment 2 A headlamp module according to Embodiment 2 will be described based on FIG. 14.
  • the headlamp module according to the second embodiment is different from the headlamp module according to the first embodiment in that the first cutoff line forming surface 221a to the fifth cutoff line forming surface 225a are each unique.
  • the reflective surfaces on the bottom surfaces of the light distribution parts 221 to 225 are each unique, whereas the second cut-off line forming surface 222a and the third cut-off line forming surface 223a are located on the same plane, and the fourth cut-off line forming surface 224a and the fifth cut-off line forming surface 225a are located on the same plane, and other points are the same.
  • the same reference numerals as those given in FIGS. 1 to 13 indicate the same or equivalent parts.
  • the first light distribution section 221 is the same as the first light distribution section 221 in the first embodiment.
  • a second cut-off line forming surface 222a in the second light distribution section 222 and a third cut-off line forming surface 223a in the third light distribution section 223 are configured to form a continuous cut-off line along the X-axis direction. This is a common cut-off line forming surface that has a ridgeline and continues along the X-axis direction on the same plane.
  • a second cut-off line forming surface 222a which is a reflective surface on the bottom surface of the first region 222A in the second light distribution section 222, and a reflection surface on the bottom surface of the first region 223A in the third light distribution section 223.
  • the third cutoff line forming surface 223a is a common cutoff line forming surface that is continuously located along the X-axis direction on the same plane parallel to the ZX plane. That is, the second cut-off line forming surface 222a and the third cut-off line forming surface 223a are common reflective surfaces in the first region section 222A and the first region section 223A,
  • the overall shape is rectangular with no physical boundaries in the X-axis direction.
  • the light beam L2 from the front surface of the second condensing optical unit 212 is reflected by a common reflective surface of the second cut-off line forming surface 222a and the third cut-off line forming surface 223a to form a cut-off line.
  • the light beam L2 is guided to the second projection lens 232 via the second area portion 222B.
  • the light beam L3 from the front surface of the third condensing optical unit 213 is reflected by a common reflecting surface of the second cut-off line forming surface 222a and the third cut-off line forming surface 223a to form a cut-off line.
  • the resulting light beam L3 is guided to the second projection lens 232 via the second area portion 223B.
  • a light distribution pattern having a desired cutoff line shape is projected on the second projection. It can be obtained from the lens 232.
  • a fourth cut-off line forming surface 224a in the fourth light distribution section 224 and a fifth cut-off line forming surface 225a in the fifth light distribution section 225 are for forming a continuous cut-off line along the X-axis direction. This is a common cut-off line forming surface that has a ridgeline and continues along the X-axis direction on the same plane.
  • a fourth cut-off line forming surface 224a which is a reflective surface on the bottom surface of the first region 224A in the fourth light distribution section 224, and a reflection surface on the bottom surface of the first region 225A in the fifth light distribution section 225.
  • the fifth cutoff line forming surface 225a is a common reflective surface that is continuously located along the X-axis direction on the same plane parallel to the ZX plane. That is, the fourth cut-off line forming surface 224a and the fifth cut-off line forming surface 225a are common reflecting surfaces in the first region section 224A and the first region section 225A, and there is no physical boundary in the X-axis direction.
  • the overall shape is rectangular with no lines.
  • the light beam L4 from the front surface of the fourth condensing optical unit 214 is reflected by a common reflective surface of the fourth cut-off line forming surface 224a and the fifth cut-off line forming surface 225a to form a cut-off line.
  • the light beam L4 is guided to the third projection lens 233 via the second area portion 224B.
  • the light beam L5 from the front surface of the fifth condensing optical unit 215 is reflected by the common reflection surface of the fourth cut-off line forming surface 224a and the fifth cut-off line forming surface 225a to form a cut-off line.
  • the resulting light beam L5 is guided to the third projection lens 233 via the second area portion 225B.
  • a light distribution pattern having a desired cut-off line shape can be applied to the third projection lens. It can be obtained from 233.
  • the headlamp module according to Embodiment 2 configured in this way has the same effects as the headlamp module according to Embodiment 1, and also has the second cutoff line forming surface 222a and the third cutoff line.
  • the forming surface 223a is a common cut-off line forming surface located continuously along the X-axis direction on the same plane, and the fourth cut-off line forming surface 224a and the fifth cut-off line forming surface 225a are arranged on the same plane in the X-axis direction.
  • the structure of the collective light distribution section 220 can be simplified, and the projection surface from the first projection surface 231a to the third projection surface 233a can be It becomes easier to form a light distribution pattern of projected light.
  • Embodiment 3 A headlamp module according to Embodiment 3 will be described based on FIG. 15.
  • the headlamp module according to the third embodiment is different from the headlamp module according to the first embodiment in that the first cut-off line forming surface 221a to the fifth cut-off line forming surface 225a are each unique.
  • the reflective surfaces on the bottom surfaces of the light distribution sections 221 to 225 are each unique, whereas the first cutoff line forming surface 221a to the fifth cutoff line forming surface 225a
  • the difference is that they are located on the same plane, and the other points are the same. Note that in FIG. 15, the same reference numerals as those given in FIGS. 1 to 13 indicate the same or corresponding parts.
  • the first cut-off line forming surface 221a in the first light distribution section 221 to the fifth cut-off line forming surface 225a in the fifth light distribution section 225 are arranged to form a continuous cut-off line along the X-axis direction.
  • This is a common cut-off line forming surface that has a ridgeline and continues along the X-axis direction on the same plane.
  • the fifth cut-off line forming surface 225a is a common cut-off line forming surface located continuously along the X-axis direction on the same plane parallel to the ZX plane. That is, the first cut-off line forming surface 221a to the fifth cut-off line forming surface 225a are common reflective surfaces in the first region 220A, and the overall shape has no physical boundary line in the X-axis direction. It has a rectangular shape.
  • the light beam L1 from the front surface of the first condensing optical section 211 is reflected by the common cutoff line forming surface, and the light beam L1 with a cutoff line formed therein is passed through the second area section 221B to the first light beam L1. to the projection lens 231.
  • the light beam L2 from the front surface of the second condensing optical section 212 is reflected by the common cutoff line forming surface, and the light beam L2 with a cutoff line formed therein is passed through the second area section 222B to the second light beam L2. to the projection lens 232.
  • the light beam L3 from the front surface of the third condensing optical section 213 is reflected by the common cutoff line forming surface, and the light beam L3 with a cutoff line formed therein is transmitted to the second area section 223B. to the projection lens 232.
  • the light beam L4 from the front surface of the fourth condensing optical section 214 is reflected by the common cutoff line forming surface, and the light beam L4 with a cutoff line formed therein is passed through the second region section 224B to the third region section 224B. to the projection lens 233.
  • the light beam L5 from the front surface of the fifth condensing optical section 215 is reflected by the common cutoff line forming surface, and the light beam L5 with a cutoff line formed therein is transmitted to the third area via the second area section 225B. to the projection lens 233.
  • the projection lens 233 By changing the shape of the ridgeline on the common cutoff line forming surface from the first cutoff line forming surface 221a to the fifth cutoff line forming surface 225a, a light distribution pattern having a desired cutoff line shape is projected in the first projection. It can be obtained from the projection lens from the lens 231 to the third projection lens 233.
  • the headlamp module according to Embodiment 3 configured as described above has the same effects as the headlamp module according to Embodiment 1, and also has the same effect as the headlamp module according to Embodiment 1. Since the formation surface 225a is a common cut-off line formation surface located continuously along the X-axis direction on the same plane, the structure of the collective light distribution section 220 can be simplified, and The projection surface 233a facilitates formation of a light distribution pattern of the projection light from the projection surface.
  • the case has been described in which there are five light guiding parts and condensing optical parts, and three projection lenses, but the invention is not limited to this, and at least two or more adjacent condensing optical parts are used.
  • the number of light guiding parts, condensing optical parts, and projection lenses can be set arbitrarily, since it is only necessary to combine the lights from the parts and guide them to one projection lens.
  • the light source distribution element for a headlamp device and the headlamp module according to the present disclosure are suitable for use in headlight devices for automobiles and motorcycles, particularly low beam headlights.
  • Light source 100 Light source distribution element for headlamp device, 110 Incident part, 111 First joint surface, 112 Second joint surface, 113 Third joint surface, 114 Fourth joint surface, 115 Fifth joint surface, 120 collective light guide section, 121 first light guide section, 122 second light guide section, 123 third light guide section, 124 fourth light guide section, 125 fifth light guide section, 121a th 1 exit surface, 122a 2nd exit surface, 123a 3rd exit surface, 124a 4th exit surface, 125a 5th exit surface, 122b 1st reflective surface, 122c 2nd reflective surface, 123b 3rd reflective surface, 123c fourth reflective surface, 124b fifth reflective surface, 124c sixth reflective surface, 125b seventh reflective surface, 125c eighth reflective surface, 200 light distribution forming section, 210 collective converging optics Part, 211 First condensing optical section, 212 Second condensing optical section, 213 Third condensing optical section, 214 Fourth condensing optical section, 215 Fifth condens

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PCT/JP2022/032475 2022-08-30 2022-08-30 前照灯モジュール Ceased WO2024047718A1 (ja)

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JP2016181364A (ja) * 2015-03-24 2016-10-13 スタンレー電気株式会社 車両用灯具
JP7031087B1 (ja) * 2021-05-12 2022-03-07 三菱電機株式会社 前照灯装置用光源分配素子、前照灯装置、及び前照灯モジュール

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WO2025216043A1 (ja) * 2024-04-10 2025-10-16 株式会社小糸製作所 車両用前照灯

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