JP6589629B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp.

Patent Document 1 is arranged on an optical axis extending in the vehicle front-rear direction, an exit surface, an entrance surface on which light exiting from the exit surface is incident, a reference point disposed facing the entrance surface, A projection lens including: a light source that is disposed at or near the reference point, and that emits white light that is incident on the projection lens from the incident surface, is emitted from the emission surface, and is irradiated forward. In the vehicle headlamp, the light source is a light source that emits white light that is a mixture of at least a first color light and a second color light, and the white light traveling in the optical axis direction is the first light source. The ratio of the light of the first color is relatively high, and the white light traveling in a direction with a larger angle with respect to the optical axis has a relatively small ratio of the light of the first color and a relative ratio of the light of the second color. The light exit surface and / or the light entrance surface is the light incident surface. Of the light from the reference point that is incident on the projection lens and emitted from the exit surface and irradiated forward, the incident position on the entrance surface is the first position on or near the optical axis. Controlling light in a direction that is not parallel to the optical axis, controlling light that is a second position where the incident position on the incident surface is away from the optical axis, in a direction parallel to the optical axis, and The incident position on the incident surface indicates light between the first position and the second position, and the optical axis gradually increases as the incident position on the incident surface moves from the first position to the second position. A vehicle headlamp is disclosed which is shaped to be controlled so as to approach a direction parallel to the headlight.
That is, in Patent Document 1, the central luminous intensity band of the vehicle light distribution pattern is formed by light emitted from the outside in the horizontal direction of the projection lens.

On the other hand, Patent Document 2 includes a semiconductor light source and a lens, and the emission center of the semiconductor light source is disposed at or near the reference focal point of the lens, and the lens has a reference optical axis. Including a central part, and a peripheral part formed at least at a part of the periphery of the central part, and at least one of the incident surface and the outgoing surface of the central part includes the A light diffusing means for diffusing the light distribution pattern formed in the central portion to include the light distribution pattern formed in the peripheral portion in the light distribution pattern formed in the central portion; The portion and the peripheral portion are portions of the lens that form a condensing light distribution pattern, and the condensing light distribution pattern formed in the central portion is mainly formed of white light. Characterized by Dual headlamp is disclosed.
That is, in Patent Document 2, the central luminous intensity band of the vehicle light distribution pattern is formed by the light emitted from the center side in the horizontal direction of the lens.

JP 2014-164876 A JP2015-156256A

  By the way, the light from the light source that is incident on the outer side in the horizontal direction of the incident surface of the lens is radiated with a large inclination with respect to the incident surface. Is emitted from the outside in the horizontal direction of the emission surface, but as in Patent Document 1, in order to direct the light emitted from the emission surface on the outside in the horizontal direction of the lens to the central luminous intensity band of the vehicle light distribution pattern, Even during this emission, the light is largely refracted.

Here, since the refractive index of the material changes depending on the temperature, when the temperature of the lens rises due to the influence of heat from the light source, the refractive index of the lens changes.
For example, when light enters the lens without much refraction and exits the lens without much refraction, the light irradiation state changes greatly even if the refractive index of the lens itself changes. Never do.

However, when light is refracted and incident on the lens and then refracted and exits the lens, if the refractive index of the lens itself changes, the light refraction state also changes greatly. The irradiation state will also change greatly.
For this reason, when the light irradiated with a large refraction is used for forming the central luminous intensity zone as in Patent Document 1, the temperature of the lens rises due to the influence of heat from the light source, and the refractive index of the lens. There is a risk that the light distribution range of the central luminous intensity band will change if the value changes, or that the luminous intensity of the central luminous intensity band will change with the change.

  On the other hand, as in Patent Document 2, when passing light into the lens and when emitting light from the lens, the light passing through the horizontal central side without large refraction is formed in the central luminous intensity zone as compared with the outside in the horizontal direction. If it is used for this, it is possible to form a central luminous intensity zone that is hardly affected by the change in the refractive index of the lens.

  However, when using the center side in the horizontal direction of the lens, the overlapping state of the light emitted from the right outer side in the horizontal direction and the light emitted from the left outer side in the horizontal direction is used, as in the case of using the lens portion outside the horizontal direction. There is a problem that the degree of freedom in design for adjusting the luminous intensity of the central luminous intensity band is low because the luminous intensity of the central luminous intensity band cannot be adjusted.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a vehicular lamp that has a degree of freedom in design of luminous intensity in a light distribution pattern and is hardly affected by temperature or the like.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) A vehicular lamp according to the present invention includes a semiconductor-type light source having an optical axis in the vicinity of a light emission center of a light emitting unit, and a lens disposed on the front side of the light source, and the lens is And an exit surface that irradiates the light incident from the entrance surface forward, and the exit surface is arranged in a horizontal direction of the exit surface on a horizontal plane including the optical axis. As a range, it has a first central emission region on the center side, a first outer emission region on the outer side in the horizontal direction, and a first intermediate emission region between the first central emission region and the first outer emission region. The lens has a predetermined irradiation direction in the horizontal direction of the light with respect to the light from the light emission center irradiated on the front side from the emission surface located on a horizontal plane including the optical axis. Is configured to perform horizontal light distribution control The irradiation of the light in the horizontal direction when the first central emission region, the first intermediate emission region, and the first outer emission region are respectively viewed from the center side of the emission surface toward the horizontal direction outside, In the one central emission region, the light distribution direction is such that the light irradiation direction becomes the outer side in the horizontal direction toward the outer side in the horizontal direction of the first central emission region, and in the first intermediate emission region, the first intermediate emission region The light is emitted in a cross light distribution toward the outside in the horizontal direction after the irradiation direction of the light becomes the inner side in the horizontal direction toward the outer side in the horizontal direction of the emission region. In the first outer emission region, the first outer emission The further to the outer side in the horizontal direction of the region, the diffused light distribution irradiation is such that the irradiation direction of the light becomes the outer side in the horizontal direction.

(2) In the configuration of (1) above, the exit surface is a second central exit region on the center side and a second outside on the vertical direction as a vertical range of the exit surface on the vertical plane including the optical axis. 2 outer emission areas, and a second intermediate emission area between the second central emission area and the second outer emission area, and the lens is located on a vertical plane including the optical axis. The light from the light emission center irradiated from the emission surface to the front side is formed so as to perform vertical light distribution control in which the irradiation direction in the vertical direction of the light is a predetermined irradiation direction, Irradiation of the light in the vertical direction of the second central emission region, the second intermediate emission region, and the second outer emission region is vertical in the second central emission region. In the second intermediate emission region, the upper irradiation, 2 toward the outer side in the vertical direction of the intermediate emission region, the light irradiation direction becomes the vertical direction center side, and then the cross light distribution irradiation becomes the upper side in the vertical direction, and in the second outer emission region, When viewed from the center side of the emission surface toward the outside in the vertical direction, the light distribution direction is such that the light irradiation direction becomes the outside in the vertical direction toward the outside in the vertical direction of the second outside emission region.

(3) In the configuration of (2), the second central emission region has a light emission angle of about 10 degrees in the vertical direction with respect to the optical axis among the light emitted from the light emission center. The second outer emission region is a region where the light emission angle is vertical with respect to the optical axis of the light emitted from the light emission center. This is a region where the light having an angle of about 30 degrees or more is irradiated to the front side.

(4) In the configuration of (2) or (3), the upward irradiation in the second central emission region is vertical on the vehicle light distribution pattern toward the outside in the vertical direction of the second central emission region. The irradiation is directed from a position approximately 4 degrees above the direction to a position approximately 1 degree above the vertical direction, and the cross light distribution irradiation in the second intermediate emission region is perpendicular to the second intermediate emission region. After the irradiation toward the center position from the position approximately 1 degree above the vertical direction on the vehicle light distribution pattern toward the outside in the direction, the position is approximately 1 degree above the vertical direction from the center position. The diffused light distribution irradiation in the second outer emission region is directed to the outer side in the vertical direction of the second outer emission region, and the second outer side located vertically above the optical axis. Light distribution pattern for vehicles in the emission area The second outer side is irradiated from a position approximately 1 degree above the vertical direction on the screen to a position approximately 3 degrees above the vertical direction, and is positioned vertically below the optical axis. In the emission region, irradiation is directed from a position approximately 1 degree above the vertical direction on the vehicle light distribution pattern to a position approximately 1 degree below the center on the light distribution pattern for the vehicle. Yes.

(5) In any one of the constitutions (1) to (4), the first central emission region has an emission angle of the light with respect to the optical axis among the light emitted from the emission center. Is an area where the light having a horizontal angle within about 10 degrees is irradiated forward, and the first outer emission area is based on the optical axis of the light emitted from the emission center. It is an area where the light is emitted forward with an emission angle of about 30 degrees or more in the horizontal direction.

(6) In the configuration according to any one of (1) to (5), the diffused light distribution irradiation in the first central emission region is distributed to the vehicle toward the outside in the horizontal direction of the first central emission region. The irradiation is directed toward a position about 5 degrees outside the horizontal direction from the center position on the light pattern, and the cross light distribution irradiation in the first intermediate emission region is directed outward in the horizontal direction of the first intermediate emission region. Thus, after the irradiation is directed from the position approximately 5 degrees outside in the horizontal direction on the vehicle light distribution pattern to the position approximately 2 degrees inside in the horizontal direction, the position from the position approximately 2 degrees inside in the horizontal direction Irradiation is directed to a position about 4 degrees outside, and the diffused light distribution irradiation in the first outer emission region is directed in the horizontal direction on the vehicle light distribution pattern toward the outside of the first outer emission region. Horizontally from a position about 4 degrees outside It has become irradiated toward the position of about 20 Dosotogawa.

(7) In any one of the constitutions (1) to (6), the exit surface has a shape of the exit surface on a vertical plane including the optical axis. The optical axis has a curved shape along a part of a substantially elliptical shape having a smaller curvature than a portion on the lower side in the vertical direction from the optical axis and having an axis substantially parallel to the optical axis as a major axis. The shape of the exit surface on the horizontal plane is formed by a compound quadratic curved surface having a curved shape substantially along a hyperbola, and the light incident on the front surface from the exit surface is for a predetermined vehicle. It forms with the free-form surface according to the shape of the said output surface so that a light distribution pattern may be formed.

(8) In any one of the constitutions (1) to (7), a fine diffusing element for diffusing the incident light is provided on the incident surface, and a radiation angle of the light is a horizontal angle. The fine diffusion element provided in a range larger than about 30 degrees has a larger light diffusion than the fine diffusion element provided in a range in which the light emission angle is within about 30 degrees in the horizontal direction angle.

  In addition, (9) In any one of the constitutions (1) to (8), the light source is provided on a light emitting unit including a plurality of light emitting chips that emit blue light, and the light emitting unit. And a phosphor layer that emits the light having a longer wavelength than the light emitted from the light emitting chip by absorbing a part of the light from the light emitting chip, and the light emitted from the light emitting chip And the light emitted from the phosphor layer is a light source that emits the white light.

  (10) In the configuration of (9), the number of the light emitting chips is 5 chips or more.

  In addition, in any one of the constitutions (1) to (10), the lens is made of an acrylic resin.

  ADVANTAGE OF THE INVENTION According to this invention, while having the freedom degree of design of the luminous intensity in a light distribution pattern, the vehicle lamp which is hard to be influenced by temperature etc. can be provided.

It is a top view of vehicles provided with a vehicular lamp of an embodiment concerning the present invention. It is a side view which shows the principal part of the lamp unit of embodiment which concerns on this invention. It is the figure which showed the horizontal cross section containing the optical axis of the lamp unit of embodiment which concerns on this invention, and also showed the light ray group whose light emission angle is less than horizontal direction angle (theta) 1 on the basis of an optical axis. . 1 shows a horizontal cross section including an optical axis of a lamp unit according to an embodiment of the present invention, wherein (a) shows a light emission angle with respect to the optical axis within a range of a horizontal angle θ2 from 10 degrees to 20 degrees. It is the figure which also showed the light ray group of the range of a degree, (b) is combining the light ray group of the range of 20 degree | times to 30 degree | times out of the range whose light emission angle is horizontal direction angle | corner (theta) 2 on the basis of an optical axis. FIG. It is the figure which showed the horizontal cross section containing the optical axis of the lamp unit of embodiment which concerns on this invention, and also showed the light ray group whose light emission angle is more than horizontal angle (theta) 3 on the basis of an optical axis. . It is the figure which showed the vertical cross section containing the optical axis of the lamp unit of embodiment which concerns on this invention, and also showed the light ray group whose light emission angle is less than vertical direction angle (theta) 4 on the basis of an optical axis. . 1 shows a vertical cross section including an optical axis of a lamp unit according to an embodiment of the present invention, wherein (a) shows a light emission angle with respect to the optical axis within a range of a vertical direction angle θ5 of 10 degrees to 20 degrees. It is the figure which also showed the light ray group of the range of a degree, (b) is combining the light ray group of the range of 20 degree | times to 30 degree | times out of the range whose light emission angle is perpendicular | vertical angle (theta) 5 on the basis of an optical axis. FIG. It is the figure which showed the vertical cross section containing the optical axis of the lamp unit of embodiment which concerns on this invention, and also showed the light ray group whose light emission angle is more than vertical direction angle | corner (theta) 6 or more on the basis of an optical axis. . It is a figure which shows the light distribution pattern for vehicles on the screen of embodiment which concerns on this invention. It is a figure which shows the light distribution pattern for vehicles on the screen at the time of providing a fine diffusion element in the entrance plane of the lens of embodiment which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment. In the embodiments and drawings, “front” and “rear” indicate “forward direction” and “reverse direction” of the vehicle, respectively, and “up”, “down”, “left” unless otherwise specified. "And" Right "respectively indicate directions viewed from the driver who gets on the vehicle.

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

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

(Lamp unit)
FIG. 2 is a perspective view showing a main part of the lamp unit 10.
As shown in FIG. 2, the lamp unit 10 has a semiconductor type having an optical axis Z of the lens 30 (hereinafter, the optical axis Z of the lens 30 may be simply referred to as the optical axis Z) in the vicinity of the light emission center of the light emitting unit 21. A light source 20 and a lens 30 disposed on the front side of the light source 20 and having an incident surface 31 on which light from the light source 20 is incident and an output surface 32 that irradiates light incident on the incident surface 31 forward. ing.
In other words, the light source 20 is provided such that the light emission center of the light emitting unit 21 is positioned substantially at the optical axis Z of the lens 30.
In the following embodiment, the description will be made in the case where the light emission center 21 of the light source 20 and the optical axis Z of the lens 30 are coincident with each other. In some cases, the optical axis Z may be shifted by about 0.2 mm in the vertical and horizontal directions, and the vicinity of the light emission center described above means such an error.

Although not shown in FIG. 2, the light source 20 is disposed on a heat sink (not shown).
In FIG. 2, the lens 30 shows only a lens portion that performs light distribution control, but in actuality, the lens 30 is in the horizontal direction (a direction orthogonal to the optical axis Z and the vertical direction axis Y). The flange portions (not shown) provided at the left and right ends of the lens are held by a lens holder (not shown) and attached to a heat sink (not shown) via the lens holder.

(light source)
As the light source 20, an LED which is a semiconductor light source is used, and specifically, a substrate 22, a light emitting unit 21 including a plurality of light emitting chips provided on the substrate 22, and a plurality of light emitting chips. And a phosphor layer 23 provided so as to cover the top of the light emitting unit 21 configured by
In addition, the light emitting unit 21 of the present embodiment is a light emitting unit 21 in which five light emitting chips are arranged in a horizontal direction and the length is about 0.85 mm and the width is 4.45 mm.

  As the light emitting chip, a light emitting chip that emits blue light having an emission spectrum peak in the vicinity of a wavelength of 430 nm is used, and the phosphor layer 23 absorbs a part of the light from the light emitting chip to emit light. Those that emit yellow light having a wavelength longer than that of light are used.

  For example, the phosphor layer 23 absorbs part of the light emitted from the light emitting chip, emits yellow light having a light emission peak at a wavelength of about 540 nm and including green to red components having a wavelength of about 500 nm to 730 nm. To do.

  Such a phosphor layer 23 can be made of, for example, a transparent thermosetting resin (for example, an epoxy resin or a silicone resin) that is excellent in heat resistance and containing a photoluminescent phosphor. As the luminescent phosphor, an yttrium / aluminum / garnet phosphor can be preferably used.

  The light emitted from the light source 20 by mixing the blue light of the light emitting chip and the yellow light of the phosphor layer 23 is white light.

(lens)
The lens 30 may be formed of a transparent material such as acrylic resin, polycarbonate resin, silicone (SLR), and glass.
However, if the wavelength dependency of the refractive index is large, spectroscopy is likely to occur, blue spectral colors are likely to appear, and resin-based materials have better moldability. An acrylic resin having a relatively small wavelength dependency is used.

Further, the lens 30 of the present embodiment has a substantially rectangular outer shape when viewed from the front surface viewed from the light exit surface 32 side from which light is emitted and from the rear surface viewed from the light incident surface 31 side from which the light is incident. In the embodiment, the exit surface 32 is a composite quadric surface, and the entrance surface 31 is controlled so that the irradiation direction of the light irradiated forward from the exit surface 32 is a predetermined direction. It is said.
That is, the incident surface 31 mainly performs light distribution control for obtaining a predetermined light distribution pattern.

More specifically, the exit surface 32 is such that the shape of the exit surface 32 on the vertical plane including the optical axis Z (that is, the vertical cross section including the optical axis Z) is an axis substantially parallel to the optical axis Z. The curved shape is substantially along a part of the elliptical shape, and this curved shape has a lower curvature in the vertical direction from the optical axis Z than in the vertical direction from the optical axis Z. .
In other words, when viewed from a vertical cross section including the optical axis Z, the exit surface 32 has a shape along the part of a large ellipse above the optical axis Z, and a small ellipse below the optical axis Z. It has a shape along a part.
On the other hand, the emission surface 32 has a curved shape in which the shape of the emission surface 32 on the horizontal plane including the optical axis Z (that is, the horizontal cross section including the optical axis Z) is substantially a hyperbola.

The light distribution pattern similar to the vehicle light distribution pattern formed by the vehicular lamp according to the present embodiment is such that the incident surface 31 is a composite quadratic curved surface and the output surface 32 is a free curved surface corresponding to the shape of the incident surface 31. Is also possible.
For this reason, the incident surface 31 is not limited to a free-form surface, and the exit surface 32 is not limited to a composite quadric surface.

However, when the entrance surface 31 is a complex quadric surface and the exit surface 32 is a free-form surface, it is difficult to design the lens 30 so that the top, bottom, left, and right edges are close to a straight line. The part becomes curved.
Then, for example, when the flange portions are provided at both the left and right ends, it is necessary to form the flange portions so as to secure a necessary width for the flange portions based on the positions of the most protruding edges in the horizontal direction. The horizontal width of the lens 30 including the portion becomes large.

Moreover, since the external appearance of the emission surface 32 in a front view is the side that can be visually recognized, the appearance is reduced in terms of design.
Therefore, considering these points, it is preferable to form the exit surface 32 with a composite quadratic curved surface and the incident surface 31 with a free curved surface as in the present embodiment.

Next, light distribution control of the vehicular lamp according to the present embodiment having the above-described configuration will be described.
3 to 5 show a horizontal cross section including the optical axis Z of the lamp unit 10, and show only the lens 30 and the light emitting unit 21.

(Horizontal light distribution control)
As shown in FIG. 3, the emission surface 32 includes a first central emission region 32 a on the center side and a first outer side in the horizontal direction as a horizontal range of the emission surface 32 on a horizontal section (horizontal plane) including the optical axis Z. And a first intermediate emission region 32c between the first central emission region 32a and the first outer emission region 32b.

  The incident surface 31 includes a first central incident region 31a on the center side and a first outer incident region 31b on the outer side in the horizontal direction as a horizontal range of the incident surface 31 on a horizontal section (horizontal plane) including the optical axis Z. And a first intermediate incident region 31c between the first central incident region 31a and the first outer incident region 31b.

(First central emission region and first central incidence region)
In FIG. 3, among the light emitted from the light emission center of the light emitting unit 21, a light beam group whose light emission angle is within the horizontal direction angle θ1 with respect to the optical axis Z is also illustrated. θ1 is about 10 degrees.

As can be seen from FIG. 3, light whose emission angle is within the horizontal angle θ1 enters the lens 30 from the first central incident area 31a, and the light travels forward from the first central emission area 32a. Irradiated.
That is, the first central emission region 32a irradiates the front side with light whose emission angle is within the horizontal angle θ1 (within about 10 degrees) with respect to the optical axis Z among the light emitted from the emission center. It has become an area.

Then, the portion of the incident surface 31 of the first central incident region 31a is gently recessed forward in the direction away from the light source 20 (light emitting portion 21) so that the position intersecting the optical axis Z is the center of the recess. It is a shape.
With such a concave shape on the front side, as shown in FIG. 3, the lens 30 moves the first central emission region 32 a from the center side (optical axis Z side) of the emission surface 32 toward the outside in the horizontal direction. The light distribution control is such that the light irradiation direction in the horizontal direction when viewed in the horizontal direction is the outer side in the horizontal direction of the first central emission region 32a, and the diffused light distribution irradiation is on the outer side in the horizontal direction.

  In the present embodiment, the light that is diffused and distributed from the first central emission region 32a to the front side is approximately 5 degrees (R5 °) on the right side of the horizontal direction of the screen (not shown) to the right in the horizontal direction. Is projected in the range of about 5 degrees (L5 °) to the left in the horizontal direction.

  For this reason, as shown in FIG. 3, the light emitted from the first central emission region 32a on the right outermost side in the horizontal direction is emitted in the direction facing the outer side by about 5 degrees (R5 °) on the right side in the horizontal direction. The light emitted from the first central emission region 32a on the left outermost side in the horizontal direction is emitted in the direction facing the outside by about 5 degrees (L5 °) on the left side in the horizontal direction.

Note that FIG. 3 shows only a group of light beams emitted from the light emission center of the light emitting unit 21, but actually, since the light emitting unit 21 emits light as a surface, the light emitted from the first central emission region 32 a. Is irradiated in a range of about 10 degrees in the horizontal direction on the screen.
In addition, since the numerical value of the specific angle of the light irradiation direction in the following description is also based on the group of light rays emitted from the light emission center of the light emitting unit 21, the description is omitted here. Similar to the description, the light irradiation range on the actual screen is widened by the amount of light emitted from the light emitting unit 21 as a surface.

  By the way, although it demonstrates in the light distribution control of the perpendicular direction mentioned later, among the lights radiated | emitted from the above light emission parts 21, regarding the light with a small radiation | emission angle, the vertical direction upper direction of the vehicle light distribution pattern is demonstrated. For this reason, the light irradiated from the first central emission region 32a described above is irradiated to the upper side in the vertical direction of the vehicle light distribution pattern.

(First intermediate emission region and first intermediate incident region)
In FIG. 4, of the light emitted from the light emission center of the light emitting unit 21, the light emission angle is in the range of the horizontal angle θ2 with respect to the optical axis Z (the light emission angle is in the range of about 10 degrees to about 30 degrees). ) Are also shown.
FIG. 4 shows two drawings of FIG. 4A and FIG. 4B so that the irradiation state of the light irradiated forward from the first intermediate emission region 32c can be easily understood. The irradiation state of the light irradiated forward is shown.

  Specifically, FIG. 4A shows a range of about 10 degrees to about 20 degrees within the range of the horizontal angle θ2 of the light emitted from the light emission center of the light emitting unit 21. FIG. 4B shows a light beam group in which the light emission angle is in the range of about 20 degrees to about 30 degrees within the range of the horizontal angle θ2. It has become.

As shown in FIG. 4, light whose light emission angle is in the range of about 10 degrees to about 30 degrees in the horizontal direction angle θ <b> 2 enters the lens 30 from the first intermediate incident area 31 c, and the light is the first intermediate The light is irradiated forward from the emission region 32c.
That is, in the first intermediate emission region 32c, the light emission angle within the range of the horizontal angle θ2 with respect to the optical axis Z in the light emitted from the light emission center (within a range of about 10 degrees to about 30 degrees). This is an area where the light of the front is irradiated on the front side.

The portion of the incident surface 31 of the first intermediate incident region 31c is formed so as to include a curved inflection point protruding toward the light emitting unit 21 side.
With such a shape, the refraction state of the light incident on the lens 30 is changed between the left side and the right side in the horizontal direction with respect to the inflection point. As shown in FIG. When the intermediate emission region 32c is viewed from the center side (optical axis Z side) toward the outer side in the horizontal direction, the light irradiation direction in the horizontal direction becomes the outer side in the horizontal direction after the irradiation direction in the horizontal direction becomes the inner side in the horizontal direction. Thus, the light distribution is controlled.

  More specifically, as shown in FIG. 4A, the irradiation direction of the light irradiated from the most central side (optical axis Z side) of the first intermediate emission region 32c is about 5 degrees outside the horizontal direction ( The first intermediate emission region 32c on the right side is about 5 degrees (R5 °) on the right outer side, and the first intermediate emission region 32c on the left side is about 5 degrees (L5 °) on the left outer side.

  Then, from this state, as shown in FIG. 4A, the right first intermediate emission region 32c has a right outer side of about 5 degrees (R5 °) toward the outer side in the horizontal direction of the first intermediate emission region 32c. The irradiation direction of the light is changed so that the irradiation is performed toward the inner side in the horizontal direction (on the optical axis Z side).

  Similarly, the first intermediate emission region 32c on the left side emits light so that light is emitted toward the inner side in the horizontal direction (the optical axis Z side) from the state where the light is emitted at about 5 degrees (L5 °) on the left outer side. The irradiation direction has changed.

  The light whose emission angle from the light emission center is about 20 degrees in the horizontal direction is about 2 degrees on the opposite side across the optical axis Z (the first intermediate emission region 32c on the right side is L2 °, 1 intermediate emission region 32c is irradiated in the direction of R2 °.

  Thereafter, as shown in FIG. 4B, the first intermediate emission region 32c on the right side is further to the left of the optical axis Z toward the horizontal outer side (right outer side in the drawing) of the first intermediate emission region 32c. The irradiation direction of light changes so that light is irradiated from the state irradiated in the direction of about 2 degrees (L2 °) to the horizontal outer side (right outer side in the figure) that does not straddle the optical axis Z, and the outermost horizontal direction. The light emitted from the light source, that is, the light whose emission angle from the light emission center is about 30 degrees in the horizontal direction, is emitted in the direction of about 4 degrees (R4 °) on the outside in the horizontal direction (the right outside in the figure) It has become so.

  Similarly, in the first intermediate emission region 32c on the left side, in the direction of about 2 degrees (R2 °) to the right of the optical axis Z toward the horizontal outer side (the left outer side in the drawing) of the first intermediate emission region 32c. The light irradiation direction changes so that the light is irradiated to the horizontal outer side (the left outer side in the figure) that does not straddle the optical axis Z from the irradiated state, and the light irradiated from the outermost horizontal direction, that is, the emission center The light having an emission angle of about 30 degrees in the horizontal direction is irradiated in a direction of about 4 degrees (L4 °) on the outside in the horizontal direction (the left outside in the figure).

  As described above, the first intermediate emission region 32c is the first intermediate emission region 32c in which the irradiation direction of the light emitted from the first intermediate emission region 32c is located on either the left or right in the horizontal direction across the optical axis Z. In the central side (optical axis Z side) of the first intermediate emission region 32c, the irradiation direction of light that was outside in the horizontal direction is directed toward the inner side in the horizontal direction (optical axis) toward the outer side in the horizontal direction of the first intermediate emission region 32c. (Z side), the cross light distribution irradiation is again performed on the outer side in the horizontal direction.

  The light emitted from the first intermediate emission region 32c on the right side is about 2 degrees (L2 °) on the left side of the horizontal center on the screen (see the optical axis Z) and about 5 degrees on the right side (R5). The light emitted from the first intermediate emission region 32c on the left side is approximately the right side of the horizontal center on the screen (see the optical axis Z). The light is irradiated in the range of 2 degrees (R2 °) to about 5 degrees (L5 °) on the left side.

  This is because the light distribution pattern formed by the light emitted from the first intermediate emission region 32c on the right side and the light distribution pattern formed by the light emitted from the first intermediate emission region 32c on the left side are positioned in the horizontal direction of the screen. This means that the light is overlapped and multiplexed, and the central light intensity band of the vehicle light distribution pattern is formed by the light thus irradiated.

  In this way, by adjusting the overlap state, it becomes possible to adjust the light intensity of the central light intensity band. Therefore, compared to the case where the central light intensity band is formed by the light irradiated from the center side of the emission surface 32. It is possible to greatly increase the degree of freedom in designing the luminous intensity in the central luminous intensity zone.

  Note that, when changing the overlap state, the light irradiation direction described above is adjusted. Therefore, the specific light irradiation direction (angle) of the first intermediate emission region 32c described above is only described. It is an example.

Since the first intermediate emission region 32c is not a region located outside as viewed in the horizontal direction of the lens 30, the first intermediate emission region 32c is light toward the central luminous intensity band as compared with the light emitted from the outside in the horizontal direction of the lens 30. Therefore, it is not difficult to be affected by a change in the refractive index due to a temperature rise of the lens 30. Also, the fact that no large refraction is caused is that the spectrum of light accompanying the refraction of light is not. It means that it is hard to be affected.
Therefore, it is possible to form a central light intensity band of a good vehicle light distribution pattern.

  By the way, in this embodiment, the light source 20 converts part of the light of the light emitting chip that emits blue light into yellow light by the phosphor layer 23 (fluorescence light emission), and the light is mixed to produce white light. As described above, the light emitting system light is used.

  In the case of such a type of light source 20, in the portion where the thickness of the phosphor layer 23 is thin, the amount of light emitted from the phosphor layer 23 is insufficient, and the proportion of blue light emitted from the light emitting chip increases. , It becomes a bluish light.

  Here, even if the thickness of the phosphor layer 23 is uniform, the light emitted from a position near the optical axis Z among the light emitted from the light source 20 has passed straight through the phosphor layer 23. Since it is light, it is substantially in a state where it has passed through the thin phosphor layer 23 as compared with light that has passed through the phosphor layer 23 obliquely.

  Therefore, light emitted from the first central emission region 32a having a small light emission angle from the light source 20 with respect to the optical axis Z is emitted without passing through the phosphor layer 23 at an angle. Tend to be white light.

However, as described above, in the present embodiment, the light emitted from the first central emission region 32a, which tends to be such bluish white light, is applied to the upper side of the vehicle light distribution pattern. Thus, the central luminous intensity band is formed by the light from the first intermediate emission region 32c from which light having a large emission angle of light, which is unlikely to be bluish white light, is emitted.
For this reason, it is suppressed that the bluish state resulting from the light source 20 appears in a central luminous intensity zone.
Therefore, it is possible to form a more suitable central luminous intensity band of the vehicle light distribution pattern.

(First outer emission region and first outer incidence region)
In FIG. 5, among the light emitted from the light emission center of the light emitting unit 21, a light beam group whose light emission angle is equal to or larger than the horizontal direction angle θ3 with respect to the optical axis Z is also illustrated. θ3 is about 30 degrees.

As shown in FIG. 5, light whose light emission angle is equal to or larger than the horizontal direction angle θ3 (about 30 degrees or more) enters the lens 30 from the first outer incident area 31b, and the light is incident on the first outer emission area 32b. Is irradiated to the front side.
That is, the first outer emission region 32b irradiates the light emitted from the emission center to the front side with a light emission angle of the horizontal direction angle θ3 or more (about 30 degrees or more) with respect to the optical axis Z. It has become an area.

  Then, the lens 30 performs the diffused light distribution irradiation in which the light irradiation direction becomes the outer side in the horizontal direction toward the outer side in the horizontal direction of the first outer emitting region 32b when the first outer emitting region 32b is viewed outward in the horizontal direction. The light distribution is controlled so as to be in a state.

  Specifically, the light distribution control of the lens 30 is performed by changing the shape of the incident surface 31 of the first outer incident region 31b according to the surface shape of the first outer emitting region 32b. The irradiation direction of the light irradiated from is made such that the outer side in the horizontal direction of the first outer emission region 32b becomes the outer side in the horizontal direction.

  As shown in FIG. 5, the light emitted forward from the first outer emission region 32b is horizontal on the vehicle light distribution pattern on the center side (optical axis Z side) of the first outer emission region 32b. About 4 degrees on the outer side in the direction (the first outer emission area 32b on the right side is about 4 degrees (R4 °) on the right side in the horizontal direction, and the first outer emission area 32b on the left side is about 4 degrees in the horizontal direction on the left side (L4 °)). It is irradiated in the direction.

  Then, the light irradiation direction is gradually increased toward the outer side in the horizontal direction of the first outer emission region 32b, and the light emitted forward from the outermost first outer emission region 32b is the vehicle light distribution. About 20 degrees on the outer side in the horizontal direction on the pattern (the first outer emission area 32b on the right side is about 20 degrees on the right side in the horizontal direction (R20 °), and the first outer emission area 32b on the left side is about 20 degrees on the left side in the horizontal direction ( L20 °)).

By irradiating light in this way, a diffused light distribution portion having the widest horizontal width in the vehicle light distribution pattern is formed.
Here, as can be seen from FIG. 5, the light emitted from the first outer emission region 32 b is emitted to the outer side in the horizontal direction outer side (the left and right outer sides in the figure). The irradiation direction is changed so as to match the curve.

  As described above, when a large amount of refraction occurs when irradiated forward from the emission surface 32, the lens 30 is easily affected by a change in the refractive index of the lens 30. Since the light is irradiated in the direction corresponding to the change, the design is such that the amount of refraction of the light irradiated from the first outer emission region 32b is suppressed, and the change in the refractive index of the lens 30 is correspondingly reduced. Can be less affected.

  Further, by using the light emitted from the first outer emission region 32b in the diffused light distribution portion of the vehicle light distribution pattern, the lens 30 is refracted in the irradiation direction of the light emitted from the first outer emission region 32b. Even if the fluctuation due to the change in the rate occurs, the central light intensity band of the vehicle light distribution pattern is not affected, and a good vehicle light distribution pattern can be maintained.

(Vertical light distribution control)
6 to 8 show a vertical cross section including the optical axis Z of the lamp unit 10, and show only the lens 30 and the light emitting unit 21.

  As shown in FIG. 6, the exit surface 32 has a second central exit region 32 </ b> A on the center side and a vertically outer side as a range in the vertical direction of the exit surface 32 on the vertical section (vertical surface) including the optical axis Z. A second outer emission region 32B and a second intermediate emission region 32C between the second central emission region 32A and the second outer emission region 32B are provided.

  Further, the incident surface 31 includes a second central incident region 31A on the center side and a second outer incident region on the outer side in the vertical direction as a range in the vertical direction of the incident surface 31 on the vertical cross section (vertical surface) including the optical axis Z. 31B and a second intermediate incident region 31C between the second central incident region 31A and the second outer incident region 31B.

(Second central emission region and second central incidence region)
In FIG. 6, among the light emitted from the light emission center of the light emitting unit 21, a light beam group whose light emission angle is within the vertical direction angle θ4 with respect to the optical axis Z is also illustrated. Specifically, θ4 is about 10 degrees.

Then, as can be seen from FIG. 6, light whose light emission angle is within the vertical direction angle θ4 enters the lens 30 from the second central incident area 31A, and the light is forward from the second central emission area 32A. Irradiated.
That is, in the second central emission region 32A, light whose emission angle is within the vertical angle θ4 (within about 10 degrees) with respect to the optical axis Z among the light emitted from the light emission center is irradiated forward. It has become an area.

  When the lens 30 is viewed from the second central emission region 32A toward the outside in the vertical direction, the light emitted from any part of the second central emission region 32A is vertically upward. Light distribution is controlled so as to be in the upward irradiation state.

  Specifically, in the light distribution control of the lens 30, the shape of the incident surface 31 of the second central incident region 31A is changed according to the surface shape of the second central outgoing region 32A. The irradiation direction of the light emitted from the second central emission region 32A is set to a shape that is vertically upward in any part of the second central emission region 32A in the vertical direction.

  As shown in FIG. 6, the light irradiated forward from the second central emission region 32A is irradiated most vertically upward on the central side (optical axis Z side) of the second central emission region 32A. As described above, the light is emitted in a direction about 4 degrees (U4 °) above the vertical direction of the vehicle light distribution pattern on the screen.

  Then, the more vertically outward (upward / downward) of the second central emission region 32A, the vertical direction of the vehicle light distribution pattern on the screen is approximately 4 degrees (U4 °) from the position above the vertical direction by approximately 1 degree. (U1 °) Irradiation toward the upper position.

Thus, the light irradiated vertically upward from the second central emission region 32A is multiplexed above the central luminous intensity band of the vehicle light distribution pattern.
Here, as described above, light with a small emission angle of light from the light emitting unit 21 tends to be bluish white light, which depends on the distance when the light passes through the phosphor layer 23. Therefore, it is irrelevant whether the irradiation direction of the light irradiated from the lens 30 is the horizontal direction or the vertical direction.

  Therefore, the light emitted from the second central emission region 32A may also be bluish white light, but the light emitted from the second central emission region 32A is multiplexed above the central luminous intensity band. Therefore, it is possible to avoid the central light intensity band from being bluish.

(Second intermediate emission region and second intermediate incidence region)
In FIG. 7, of the light emitted from the light emission center of the light emitting unit 21, the light emission angle is within the range of the vertical angle θ5 with respect to the optical axis Z (the light emission angle is about 10 degrees to about 30 degrees). A group of light rays within the range is also shown.
FIG. 7 shows two drawings of FIG. 7A and FIG. 7B so that the irradiation state of light irradiated forward from the second intermediate emission region 32C can be easily understood. The irradiation state of the light irradiated forward is shown.

  Specifically, FIG. 7A shows that the light emission angle of the light emitted from the light emission center of the light emitting unit 21 is in the range of about 10 degrees to about 20 degrees within the range of the vertical angle θ5. FIG. 7B shows a light beam group in which the light emission angle is in the range of about 20 degrees to about 30 degrees within the range of the vertical angle θ5. Yes.

As shown in FIG. 7, light whose light emission angle is in the range of about 10 degrees to about 30 degrees in the vertical direction angle θ <b> 5 enters the lens 30 from the second intermediate incident area 31 </ b> C, and the light is second intermediate The light is emitted forward from the emission region 32C.
That is, in the second intermediate emission region 32C, light emitted from the light emission center is forward with light within a range of about 10 degrees to about 30 degrees in the vertical direction angle θ5 with respect to the optical axis Z. It is an area irradiated to the side.

Then, in the second intermediate emission region 32C, the lens 30 is arranged so that the light irradiation direction in the vertical direction is in the state of cross light distribution irradiation that is on the upper side in the vertical direction after the irradiation direction in the vertical direction becomes the central side. Light control.
Specifically, in the light distribution control of the lens 30, the shape of the incident surface 31 of the second intermediate incident region 31C is changed according to the surface shape of the second intermediate output region 32C. After the irradiation direction of the light irradiated from the vertical direction center side, the cross light distribution irradiation is formed on the upper side in the vertical direction.

  More specifically, as shown in FIG. 7A, the irradiation direction of the light irradiated from the most central side (the optical axis Z side) of the second intermediate emission region 32C sandwiches the optical axis Z. In any of the second intermediate emission regions 32C positioned above and below, the angle is about 1 degree (U1 °) above the vertical direction on the vehicle light distribution pattern.

Then, from this state, as shown in FIG. 7 (a), any second intermediate emission region 32C positioned above and below the optical axis Z is outside the second intermediate emission region 32C in the vertical direction (the vertical direction in the figure). The direction of light irradiation is such that light is emitted toward the center side in the vertical direction, which is the center position on the vehicle light distribution pattern, that is, about 0 degrees (about 0 °). It has changed.
In the process of change of the irradiation direction in which the irradiation of the light in the vertical direction becomes the central side in the vertical direction, the light irradiated from the second intermediate emission region 32C located above the optical axis Z is subjected to cross light distribution irradiation. It is in a state.

Thereafter, as shown in FIG. 7 (b), the second intermediate emission region 32C positioned above and below the optical axis Z further toward the outside in the vertical direction (outside in the vertical direction in the drawing) of the second intermediate emission region 32C. Accordingly, light is emitted so as to irradiate light from a center position on the vehicle light distribution pattern (vertical direction about 0 degrees (about 0 degrees)) to a position about 1 degree (U1 degrees) in the vertical direction. The irradiation direction has changed.
In the process of changing the irradiation direction in which the irradiation of the light in the vertical direction is on the upper side in the vertical direction, the light irradiated from the second intermediate emission region 32C located below the optical axis Z is irradiated with the cross light distribution. It is in the state.

  As described above, the second intermediate emission region 32C is vertically upward after the light irradiation direction becomes the central side in the vertical direction in any of the second intermediate emission regions 32C positioned above and below the optical axis Z. In the process of changing the irradiation direction, the cross light distribution irradiation is performed.

  The light emitted from the second intermediate emission region 32C located above the optical axis Z is about 1 degree vertically upward from the vertical center side (vertical direction 0 degree (0 °)) on the screen. The light emitted from the second intermediate emission region 32C located below the optical axis Z is also irradiated toward the range of (U1 °). Irradiation is performed toward a range of about 1 degree (U1 °) from the vertical direction (0 degree (0 °)) upward in the vertical direction.

  This is irradiated from the light distribution pattern formed by the light irradiated from the second intermediate emission region 32C located above the optical axis Z and from the second intermediate emission region 32C located below the optical axis Z. This means that the light distribution pattern formed by the light overlaps at the position in the vertical direction of the screen and is in a state of being multiplexed. A central luminous intensity zone is formed.

  In this way, by adjusting the overlap state, it becomes possible to adjust the light intensity of the central light intensity band. Therefore, compared to the case where the central light intensity band is formed by the light irradiated from the center side of the emission surface 32. It is possible to greatly increase the degree of freedom in designing the luminous intensity in the central luminous intensity zone.

  Note that, when changing the overlap state, the light irradiation direction described above is adjusted. Therefore, the specific light irradiation direction (angle) of the first intermediate emission region 32c described above is only described. It is an example.

Since the second intermediate emission region 32C is not a region located outside as viewed in the vertical direction of the lens 30, the second intermediate emission region 32C is light toward the central luminous intensity band as compared with the light emitted from the outer side in the vertical direction of the lens 30. Therefore, it is not difficult to be affected by a change in the refractive index due to a temperature rise of the lens 30. Also, the fact that no large refraction is caused is that the spectrum of light accompanying the refraction of light is not. It means that it is hard to be affected.
Therefore, it is possible to form a central light intensity band of a good vehicle light distribution pattern.

Further, the second intermediate emission region 32C is a portion from which light having a large emission angle is emitted in which the light emission angle from the light emitting unit 21 is about 10 degrees or more in the vertical direction angle. The irradiated light is unlikely to be bluish white light, and the central light intensity band is formed by the light irradiated from the second intermediate emission region 32C, so that the appearance of blue light in the central light intensity band is also suppressed. Is done.
Therefore, it is possible to form a more suitable central luminous intensity band of the vehicle light distribution pattern.

(Second outer emission region and second outer incidence region)
In FIG. 8, among the light emitted from the light emission center of the light emitting unit 21, a light beam group whose light emission angle is equal to or larger than the vertical direction angle θ 6 with respect to the optical axis Z is also illustrated. θ6 is about 30 degrees.

As shown in FIG. 6, light whose light emission angle is equal to or greater than the vertical angle θ6 (about 30 degrees or more) enters the lens 30 from the second outer incident area 31B, and the light is incident on the second outer emission area 32B. Is irradiated to the front side.
That is, in the second outer emission region 32B, the light emitted from the light emission center is irradiated with light whose light emission angle is equal to or larger than the vertical angle θ6 (about 30 degrees or more) with respect to the optical axis Z. It has become an area.

  When the second outer emission region 32B is viewed from the center side of the emission surface 32 toward the outside in the vertical direction, the lens 30 has a light irradiation direction that is closer to the outer side in the vertical direction than the second outer emission region 32B. The light distribution is controlled so as to be in the state of the diffuse light distribution irradiation.

  Specifically, the light distribution control of the lens 30 is performed by changing the shape of the incident surface 31 of the second outer incident region 31B according to the surface shape of the second outer emitting region 32B. The irradiation direction of the light emitted from the second outer emission region 32B is formed such that the outer side in the vertical direction is the outer side in the vertical direction.

  As shown in FIG. 8, the light irradiated forward from the second outer emission region 32B is the second outer emission region in any second outer emission region 32B located above and below the optical axis Z. On the center side (optical axis Z side) of 32B, the light is irradiated in a direction of about 1 degree (U1 °) above the vertical direction on the vehicle light distribution pattern.

  Then, the light irradiation direction becomes increasingly outward in the vertical direction outward (upward and downward in the drawing) of the second outer emission region 32B, and the outermost vertical direction of the second outer emission region 32B located above the optical axis Z. The light emitted from the outer side (outer side in the figure) to the front side is irradiated in a direction that is about 3 degrees (U3 °) on the outer side in the vertical direction (upward in the vertical direction), and the second outer side located below the optical axis Z. The light emitted from the outermost vertical direction (the lower outer side in the figure) to the front side of the emission region 32B is irradiated in a direction of about 1 degree (D1 °) on the outer side in the vertical direction (the lower side in the vertical direction). Thus, the light irradiated to a wide range becomes diffuse light distribution.

  Here, as can be seen from FIG. 8, the light emitted from the second outer emission region 32 </ b> B is emitted to the outer side in the vertical direction outer side (upper and lower outer side in the figure). The irradiation direction is changed so as to match the curve.

  As described above, when a large amount of refraction occurs when irradiated forward from the emission surface 32, the lens 30 is easily affected by a change in the refractive index of the lens 30. Since the light is irradiated in the direction corresponding to the change, the design is such that the amount of refraction of the light irradiated from the second outer emission region 32B is suppressed, so the change in the refractive index of the lens 30 correspondingly. It can be difficult to be affected by.

  Further, since the light emitted from the second outer emission region 32B is a diffused light distribution diffused in a wide range, it does not form a light distribution having a high luminous intensity. Even if the wobbling due to the change in the refractive index of the lens 30 occurs in the irradiation direction of the light irradiated from 32B, the central luminous intensity band of the vehicle light distribution pattern is not affected.

FIG. 9 shows a high beam light distribution pattern HP that is a vehicle light distribution pattern of the present embodiment formed as described above.
As described above, the high beam light distribution pattern HP of this embodiment is roughly formed by multiplexing three light distribution patterns HP1, HP2, and HP3.

  The light distribution pattern HP1 shown in FIG. 9 is a light distribution pattern HP1 mainly formed by light with a small emission angle of light from the light emitting unit 21, and this portion may become bluish white light. is there.

  For this reason, as shown in FIG. 9, bluing is unlikely to appear in the central luminous intensity band (see the light distribution pattern HP2) of the high beam light distribution pattern HP by being multiplexed above the high beam light distribution pattern HP.

Further, the light distribution pattern HP2 shown in FIG. 9 is a light having a relatively large radiation angle from the light emitting unit 21, and has a large refraction that passes through an intermediate portion between the entrance surface 31 and the exit surface 32 of the lens 30. It is a light distribution pattern mainly formed by light that is not accompanied.
Further, as described above, the light distribution pattern HP2 is adjusted so as to obtain a high luminous intensity required for the central luminous intensity band by overlapping (multiplexing) the two light distribution patterns.

  Therefore, even if there is a change in the refractive index of the lens 30 due to a rise in temperature of the lens 30 or the like, the lens 30 is not affected by the change, and is formed by light without large refraction. In addition, the spectral color associated with refraction is less likely to appear, and the high luminous intensity required as the central luminous intensity band can be appropriately obtained.

On the other hand, the light distribution pattern HP3 shown in FIG. 9 is a light distribution pattern mainly formed by light passing outside the entrance surface 31 and the exit surface 32 of the lens 30.
As described above, in the present embodiment, since the diffused light distribution irradiation in which the light is emitted outward also on the outer side of the lens 30, the refraction of the light passing through the lens 30 is suppressed. However, the light passing through the entrance surface 31 and the exit surface 32 of the lens 30 is accompanied by a large refraction compared to the light passing through the inside.

  For this reason, when the refractive index of the lens 30 changes greatly, there is a risk of being affected, but the use of such light for the diffused light distribution portion of the high beam light distribution pattern HP does not affect the central luminous intensity band. Therefore, even if the refractive index of the lens 30 changes, it is possible to maintain a good high beam distribution pattern HP state.

  As described above, the high beam light distribution pattern HP that is the vehicle light distribution pattern of the present embodiment can be excellent in any of temperature stability, color state, and light intensity in the central luminous intensity band. .

By the way, as can be seen from FIG. 9, there is a local change in the shape of the high beam light distribution pattern HP in the dotted circle A, and it is more preferable to suppress such a local change.
In addition, since it is possible to improve visibility when the light and dark boundary lines appearing at the boundaries of the high beam light distribution pattern HP are clear, the visibility of the high beam light distribution pattern is better. More preferred.
Furthermore, as described above, the design is such that the spectral color is less likely to appear, but it is further desirable that the spectral color is less likely to appear.

Therefore, it is preferable to provide a fine diffusing element for diffusing light on the incident surface 31 of the lens 30.
In addition, although the incident surface 31 demonstrated so far is also the incident surface 31 in this specification, it is an optical incident surface into which the light for forming the light distribution pattern for vehicles injects.

Specifically, it is only necessary to provide a micro-diffusion element so as to form a gradual change irregularity such as a wave on the incident surface 31 (optical incident surface).
FIG. 10 shows a high beam light distribution pattern HP ′ when such a fine diffusion element is provided.
FIG. 10 shows the high beam light distribution pattern HP ′ on the screen by isoluminous lines.

  In the high beam light distribution pattern HP ′ shown in FIG. 10, the difference between the lowest position of the concave portion and the highest position of the convex portion is 12.0 μm as a basic uneven state, that is, the concave portion and the convex portion are formed. When the surface to be measured (average height surface) is defined, ± 6.0 μm irregularities (hereinafter referred to as irregularities) are provided on the incident surface 31.

  However, for the portion that is outside 30 degrees in the horizontal direction angle from the emission center, the unevenness is slightly increased, and light diffusion is performed as a fine diffusion element with an unevenness in the range of about ± 8.0 μm to ± 10.0 μm. It is getting bigger.

The dotted line circle A portion is also shown in FIG. 10 so that the same range as the dotted line circle A portion in FIG. 9 can be seen. However, if the fine diffusing element is provided on the incident surface 31 in this manner, FIG. As shown in FIG. 10, the high-beam light distribution pattern HP ′ has no sharp change in luminous intensity, has a well-defined light / dark boundary line, and gradually changes in overall shape, and is locally No change in shape.
In addition, when light is diffused by the fine diffusing element, the light is mixed and the spectral color is less likely to appear.
As described above, by providing the fine diffusing element on the incident surface 31, it is possible to realize a better high beam light distribution pattern HP ′.

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

DESCRIPTION OF SYMBOLS 10 Lamp unit 20 Light source 21 Light emission part 22 Substrate 23 Phosphor layer 30 Lens 31 Incidence surface 31a 1st center incidence area 31b 1st outside incidence area 31c 1st middle incidence area 31A 2nd center incidence area 31B 2nd outside incidence area 31C Second intermediate incident region 32 Output surface 32a First central output region 32b First outer output region 32c First intermediate output region 32A Second central output region 32B Second outer output region 32C Second intermediate output region Z Optical axes HP1, HP2 , HP3 Light distribution pattern HP, HP 'High beam light distribution pattern 101L, 101R Vehicle lighting 102 Vehicle

Claims (8)

A semiconductor-type light source having an optical axis in the vicinity of the light emission center of the light emitting unit;
A lens disposed on the front side of the light source,
The lens has an incident surface on which light from the light source is incident and an exit surface that irradiates the light incident from the incident surface forward.
The emission surface includes a first central emission region on the center side, a first outer emission region on the outer side in the horizontal direction, and the first central emission region as a horizontal range of the emission surface on a horizontal plane including the optical axis. And a first intermediate emission region between the first outer emission region and
The lens has a horizontal irradiation direction in which a horizontal irradiation direction of the light is a predetermined irradiation direction with respect to the light from the light emission center irradiated to the front side from the emission surface located on a horizontal plane including the optical axis. It is formed to perform light distribution control of direction,
The irradiation of the light in the horizontal direction when the first central emission region, the first intermediate emission region, and the first outer emission region are respectively viewed from the center side of the emission surface toward the horizontal outer side,
In the first central emission region, the light distribution direction is such that the light irradiation direction becomes the horizontal direction outer side toward the horizontal direction outer side of the first central emission region,
In the first intermediate emission region, toward the outer side in the horizontal direction of the first intermediate emission region, the light irradiation direction becomes a cross light distribution irradiation which becomes the horizontal direction outer side after the light irradiation direction becomes the horizontal direction inner side,
The vehicular lamp according to claim 1, wherein in the first outer emission region, the light distribution direction is such that the light irradiation direction becomes the outer side in the horizontal direction toward the horizontal outer side of the first outer emission region. The emission surface includes a second central emission region on the central side, a second outer emission region on the outer side in the vertical direction, and the second central emission as a vertical range of the emission surface on the vertical surface including the optical axis. A second intermediate emission region between the region and the second outer emission region,
In the lens, with respect to the light from the light emission center irradiated on the front side from the emission surface located on the vertical plane including the optical axis, the irradiation direction in the vertical direction of the light is a predetermined irradiation direction. It is formed to perform vertical light distribution control,
Irradiation in the vertical direction of the light of the second central emission region, the second intermediate emission region and the second outer emission region,
In the second central emission region, the irradiation direction of the light is an upper irradiation that is vertically upward,
In the second intermediate emission region, the light irradiation direction is the cross light distribution irradiation which becomes the upper side in the vertical direction after the irradiation direction of the light becomes the vertical center side toward the outer side in the vertical direction of the second intermediate emission region. And
In the second outer emission region, when viewed from the center side of the emission surface toward the outer side in the vertical direction, the diffusion of the light irradiation direction toward the outer side in the vertical direction toward the outer side in the vertical direction of the second outer emission region. The vehicular lamp according to claim 1, wherein the vehicular lamp is provided with light distribution irradiation. The second central emission region is irradiated forward with the light whose emission angle is within about 10 degrees in the vertical direction with respect to the optical axis out of the light emitted from the light emission center. Area,
In the second outer emission region, the light emitted from the light emission center is irradiated forward with the light whose emission angle is about 30 degrees or more with respect to the optical axis. The vehicular lamp according to claim 2, wherein the vehicular lamp is a region. The upward irradiation in the second central emission region is about 1 in the vertical direction from a position approximately 4 degrees above the vertical direction on the vehicle light distribution pattern toward the outside in the vertical direction of the second central emission region. It is irradiation toward the position on the upper side,
The cross light distribution irradiation in the second intermediate emission region is directed from the position approximately 1 degree above the vertical direction on the vehicle light distribution pattern to the center position toward the outside in the vertical direction of the second intermediate emission region. After being directed toward the irradiation, it is directed toward the position about 1 degree above the vertical direction from the center position,
The diffused light distribution irradiation in the second outer emission region is directed to the vehicle outer light distribution in the second outer emission region located vertically above the optical axis toward the outer side in the vertical direction of the second outer emission region. The second outer side is irradiated from a position approximately 1 degree above the vertical direction on the pattern to a position approximately 3 degrees above the vertical direction and is positioned below the optical axis in the vertical direction. In the emission region, irradiation is directed from a position approximately 1 degree above the vertical direction on the vehicle light distribution pattern to a position approximately 1 degree below the center on the light distribution pattern for the vehicle. The vehicular lamp according to claim 2, wherein the vehicular lamp is provided. In the first central emission region, the light emitted from the emission center is irradiated forward with the light whose emission angle is within about 10 degrees in the horizontal direction with respect to the optical axis. Area,
In the first outer emission region, the light emitted from the emission center is irradiated forward with the light whose emission angle is about 30 degrees or more in the horizontal direction with respect to the optical axis. The vehicular lamp according to any one of claims 1 to 4, wherein the vehicular lamp is a region. The diffused light distribution irradiation in the first central emission region is directed outward from the center position on the vehicle light distribution pattern by about 5 degrees in the horizontal direction toward the outer side in the horizontal direction of the first central emission region. Irradiation
The cross light distribution irradiation in the first intermediate emission region is about 2 in the horizontal direction from a position about 5 degrees outside in the horizontal direction on the vehicle light distribution pattern toward the outside in the horizontal direction of the first intermediate emission region. After the irradiation toward the inner position, the irradiation is directed from the inner position of about 2 degrees in the horizontal direction to the outer position of about 4 degrees in the horizontal direction,
The diffused light distribution irradiation in the first outer emission region is about 20 degrees in the horizontal direction from a position about 4 degrees outside in the horizontal direction on the vehicle light distribution pattern toward the outside of the first outer emission region. The vehicular lamp according to any one of claims 1 to 5, wherein the illumination is directed toward an outer position. The exit surface has a shape of the exit surface on a vertical plane including the optical axis, and the portion on the upper side in the vertical direction from the optical axis has a smaller curvature than the portion on the lower side in the vertical direction from the optical axis, and It is a curved shape along a part of a substantially elliptical shape having an axis substantially parallel to the optical axis as a major axis, and the shape of the emission surface on a horizontal plane including the optical axis is a curved shape substantially along a hyperbola. It is formed with a composite quadric surface,
The entrance surface is formed as a free-form surface corresponding to the shape of the exit surface so that the light irradiated forward from the exit surface forms a predetermined vehicle light distribution pattern. The vehicular lamp according to any one of claims 1 to 6. The incident surface is provided with a fine diffusing element for diffusing the incident light,
The fine diffusion element provided in a range where the light emission angle is greater than about 30 degrees in the horizontal direction is more than the fine diffusion element provided in a range where the light emission angle is within about 30 degrees in the horizontal direction angle. The vehicular lamp according to any one of claims 1 to 7, wherein light diffusion is large.

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