JP6455004B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a projector-type vehicular lamp.

  This type of vehicular lamp is conventionally known (for example, Patent Document 1). The vehicular lamp of Patent Document 1 has a projection lens, an LED disposed behind a rear focus of the projection lens, a rear focus of the projection lens as a first focus, and an LED as a second focus. And a reflector having a substantially elliptical reflecting surface. In the vehicular lamp of Patent Document 1, when an LED is turned on, light emitted from the LED is reflected by the reflecting surface of the reflector, and the reflected light is incident on the projection lens to form a predetermined light distribution pattern from the emitting surface of the projection lens. Irradiated outside.

JP 2010-49929 A JP2013-257948A

  However, in the vehicular lamp of Patent Document 1, the exit surface of the projection lens forms an aspherical surface. That is, the shape of the cross section of the exit surface of the projection lens and the shape of the longitudinal section of the exit surface of the projection lens are the same aspherical shape. For this reason, the light emitted from the exit surface of the projection lens is made into parallel light in the transverse section and the longitudinal section. As a result, the vehicle lamp of Patent Document 1 has a problem in forming a light distribution pattern (so-called wide light distribution pattern) unique to the vehicle lamp that diffuses light in the lateral direction (left-right direction, horizontal direction). There is. That is, in the vehicle lamp of Patent Document 1, it is necessary to enlarge the projection lens in order to form a light distribution pattern that diffuses light in the lateral direction.

  Here, the vehicle lamp (for example, patent document 2) which forms a long light distribution pattern in the left-right direction is demonstrated. The vehicular lamp of Patent Document 2 is not a projector-type vehicular lamp, but is a direct projection-type vehicular lamp, and includes an LED and a projection lens. The projection lens includes a first light distribution control unit at the center and second light distribution control units on the left and right sides, and the shape of the cross section of the exit surface and the shape of the longitudinal section of the exit surface are Is different. For this reason, in the vehicular lamp of Patent Document 2, the light emitted radially from the LEDs is parallel light in the longitudinal section, diffused in the lateral direction in the lateral section, and has a light distribution pattern that is long in the lateral direction. Is formed.

  However, the vehicular lamp of Patent Document 2 is a direct projection type vehicular lamp. For this reason, direct light from the LED is incident on the incident surface of the first light distribution control unit at the center of the projection lens and the incident surfaces of the second light distribution control unit on the left and right sides of the projection lens. Incident light that has entered the incident surface of the second light distribution control unit is emitted so as to approach the optical axis from the emission surface of the second light distribution control unit in the cross section. Thus, the vehicle lamp of Patent Document 2 has a problem in forming a light distribution pattern that is longer in the left-right direction.

  The problem to be solved by the present invention is that the conventional vehicle lamp has a problem in forming a wide light distribution pattern in which light is diffused in the lateral direction.

The inventions includes a reflector having a reflecting surface an ellipsoid being a key, and a light source disposed at a first focal point or near the reflecting surface, the projection lens to emit to the outside light reflected from the reflecting surface from the exit surface The shape of the cross section of the exit surface of the projection lens is a convex curve that protrudes toward the light exit direction, and the shape of the longitudinal section of the exit surface of the projection lens is aspheric or almost aspheric. It is characterized by having a cross-sectional line shape.

The inventions includes a reflector having a reflecting surface an ellipsoid being a key, and a light source disposed at a first focal point or near the reflecting surface, the projection lens to emit to the outside light reflected from the reflecting surface from the exit surface The cross-sectional shape of the exit surface of the projection lens is an aspherical surface or a substantially aspherical cross-sectional line shape, and the vertical cross-sectional shape of the exit surface of the projection lens is an aspherical surface or a substantially aspherical cross section. It has a linear shape, and the rear focal length of the cross section of the projection lens is longer than the rear focal length of the vertical cross section of the projection lens.

The inventions includes a reflector having a reflecting surface an ellipsoid being a key, and a light source disposed at a first focal point or near the reflecting surface, the projection lens to emit to the outside light reflected from the reflecting surface from the exit surface And the shape of the cross section of the exit surface of the projection lens is a combination of a convex curve shape projecting toward the light exit direction and an aspherical or almost aspherical cross section line shape, and the central portion is It has an aspherical or almost aspherical cross-sectional line shape, both sides have a convex curve shape protruding toward the light emission direction, and the vertical cross-sectional shape of the exit surface of the projection lens is an aspherical or almost aspherical cross section It has a linear shape.

The inventions, the light emitted from the exit surface of the projection lens, in cross-section, is diffused in the lateral direction without crossing each other, characterized in that.

The inventions of the vehicle lamp forms a convex curved profile shape of the cross section of the exit surface of the projection lens is projected in the outgoing direction of light. As a result, the inventions of the vehicle lamp, the wide light distribution pattern light is diffused in the lateral direction can be reliably formed.

The inventions of the vehicle lamp, the shape of the cross section of the exit surface of the projection lens and the shape of the longitudinal section of the exit surface of the projection lens forms the aspherical section line shape, rear focal point of the cross-section of the projection lens The distance is longer than the rear focal length of the longitudinal section of the projection lens. As a result, the inventions of the vehicle lamp, the wide light distribution pattern light is diffused in the lateral direction can be reliably formed.

The inventions of the vehicle lamp, the shape of the cross section of the exit surface of the projection lens, a shape of a combination of a convex curved shape protruding on the emission direction side of the light and the aspherical surface of section line shape, the central portion It has an aspheric cross-sectional line shape, and has a convex curve shape in which both side portions protrude toward the light emission direction side. As a result, the inventions of the vehicle lamp, while ensuring light intensity in the central portion of the light distribution pattern (condensation degrees), a wide light distribution pattern light is diffused in the lateral direction can be formed assuredly .

Moreover, the inventions of the vehicle lamp is a vehicle lamp of the projector type. For this reason, the reflected light which is the light from the light source and reflected by the reflecting surface of the reflector is incident on the incident surface of the projection lens. The incident light exits from the exit surface of the projection lens as exit light diffused in the lateral direction in the cross section. Thereby, a wide light distribution pattern in which light is diffused in the lateral direction can be reliably formed.

The inventions of the vehicle lamp, light emitted from the exit surface of the projection lens, in cross-section, is diffused in the lateral direction without intersecting each other. Thereby, a wide light distribution pattern in which light is diffused in the lateral direction can be reliably formed.

FIG. 1 is an explanatory diagram of a projection lens showing Embodiment 1 of a vehicular lamp according to the present invention. FIG. 2 is an explanatory view showing a schematic cross section of the lamp unit. FIG. 3 is a schematic cross-sectional explanatory view of a lamp unit showing a difference in diffusion of light in the horizontal direction. FIG. 4 is an explanatory diagram showing an outline of the lateral diffusion light distribution pattern and the light collection light distribution pattern. FIG. 5 is an explanatory view of a projection lens showing Embodiment 2 of the vehicular lamp according to the present invention.

  Hereinafter, two examples of the embodiment (example) of the vehicular lamp according to the present invention and one example of the modification will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment and a modification. In FIGS. 1 to 3 and 5, the hatching of the projection lens is omitted. In FIG. 4, reference sign “VU-VD” indicates vertical lines on the top and bottom of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. In this specification, front, rear, upper, lower, left, and right are front, rear, upper, lower, left, and right when the vehicle lamp according to the present invention is mounted on a vehicle.

(Description of Configuration of Embodiment 1)
1 to 4 show Embodiment 1 of a vehicular lamp according to the present invention. Hereinafter, the configuration of the vehicular lamp in the first embodiment will be described. In this example, for example, a headlamp of an automotive headlamp will be described.

(Description of vehicle lamp 1)
2 and 3, reference numeral 1 denotes a vehicular lamp according to the first embodiment. The vehicle lamp 1 is mounted on both the left and right sides of the front portion of the vehicle. As shown in FIGS. 2 and 3, the vehicular lamp 1 includes a lamp housing (not shown), a lamp lens (not shown), a light source 2, a projection lens 3, and a reflector 4. . The light source 2, the projection lens 3, and the reflector 4 are respectively attached to an attachment member (not shown) that also serves as a heat sink member.

  The lamp housing and the lamp lens (for example, a transparent outer lens) define a lamp chamber (not shown). The light source 2, the projection lens 3, and the reflector 4 constitute a projector-type lamp unit. As shown in FIG. 4, the lamp units 2, 3, and 4 are lamp units that irradiate a diffused light distribution pattern WP among low beam light distribution patterns.

  The lamp units 2, 3, and 4 are disposed in the lamp chamber, and are disposed via an up / down direction optical axis adjustment mechanism (not shown) and a left / right direction optical axis adjustment mechanism (not shown). Attached to the lamp housing. Although not shown, the lamp chamber irradiates the condensed light distribution pattern SP among the low beam distribution patterns, the high beam irradiation lamp unit, the ADB irradiation lamp unit, the fog lamp, the cornering lamp, and the clearance lamp. Other lamp units such as turn signal lamps, overhead sign lamps, daytime running lamps may be arranged.

  The diffusion light distribution pattern WP has an upper horizontal cut-off line as shown in FIG. As shown in FIG. 4, the light collection light distribution pattern SP has a lower horizontal cutoff line CL1, an oblique cutoff line CL2, an upper horizontal cutoff line CL3, and an elbow point E. The upper horizontal cutoff line of the diffused light distribution pattern WP is located at a position substantially equal to or slightly below the lower horizontal cutoff line CL1 of the light collection light distribution pattern SP.

(Description of reflector 4)
The reflector 4 is made of a material having high heat resistance such as a resin member or metal die-casting (aluminum die-casting) and a light-impermeable material. The reflector 4 has a hollow shape in which a front portion and a lower portion are open, and a rear portion, an upper portion, and left and right side portions are closed. On the concave inner surface of the closed portion of the reflector 4, a reflecting surface 40 made of a free-form surface based on a spheroid (ellipse) is provided.

  The reflection surface 40 is composed of a free-form surface. For this reason, the first focal point F1 and the second focal point (or the second focal line) F2 of the reflective surface 40 do not have a single focal point in a strict sense, but a plurality of reflective surfaces are mutually connected. The difference in focal length is small and shares almost the same focal point. Therefore, in this specification and drawings, they are simply referred to as a first focus and a second focus. The reflecting surface 40 has an optical axis Z that connects the first focal point F1 and the second focal point F2. The reflection surface 40 reflects light from the light source 2 to the projection lens 3 side as reflected light L1 and L2. Since the reflecting surface 40 is formed of a free-form surface, as shown in FIG. 2, a part L1 of the reflected lights L1 and L2 from the reflecting surface 40 is the second focal point F2 or There is a case where it does not pass through the vicinity.

(Description of light source 2)
In this example, the light source 2 is a semiconductor-type light source and uses a self-luminous semiconductor-type light source such as an LED, an OEL, or an OLED (organic EL). The light source 2 includes a light emitting unit having a light emitting surface that emits light, and a substrate unit. The light emitting surface of the light emitting unit of the light source 2 is located at or near the first focal point F1 of the reflecting surface 40 of the reflector 4. The light emitting surface of the light emitting unit of the light source 2 faces the reflecting surface 40 of the reflector 4.

(Description of the projection lens 3)
The projection lens 3 is made of a resin lens such as a PC material, a PMMA material, or a PCO material. That is, since the light emitted from the light source 2 does not have high heat, a resin lens can be used as the projection lens 3.

  The projection lens 3 is light from the light source 2 and irradiates (projects) a predetermined light distribution pattern, in this example, the diffuse light distribution pattern WP to the outside, that is, the front of the vehicle. The projection lens 3 includes a rear entrance surface 30, front exit surfaces 31, 31 </ b> H, 31 </ b> V, a flange portion 32, and a side surface 33.

  As shown in FIGS. 1B, 2, and 3, the cross-sectional shape of the emission surfaces 31 and 31 </ b> H is a convex curve shape that protrudes to the emission direction side (front side) of light (emission light L <b> 3 and L <b> 4). That is, R or almost R. As shown by the two-dot chain line in FIG. 1C and FIG. 3, the vertical cross-sectional shape of the emission surfaces 31 and 31V is an aspherical surface or a substantially aspherical cross-sectional line shape.

  The exit surfaces 31, 31H, and 31V have a cross-sectional shape of a convex curve (R or substantially R), and a longitudinal cross-section of an aspherical surface or a substantially aspherical cross-sectional line shape. It has a swept surface shape.

  The incident surface 30 faces the reflecting surface 40 of the reflector 4. The incident surface 30 is flat or substantially flat. The flange portion 32 is integrally provided in a bowl shape on the entire periphery of the incident surface 30. The side surface 33 is provided between the emission surface 31H and the flange portion 32 in a cross section.

  A rear focal point (a meridional image plane that is a focal plane on the object space side) FV of the projection lens 3 coincides with or substantially coincides with the second focal point F2 of the reflecting surface 40. The projection lens 3 has a rear focal length A. The optical axis (lens axis) Z of the projection lens 3 coincides with or substantially coincides with the optical axis Z of the reflecting surface 40.

  Although not shown in the drawings, shades are arranged at the second focal point F2 of the reflecting surface 40 and the rear focal point FV of the projection lens 3 or in the vicinity thereof. The shade forms the diffused light distribution pattern WP by cutting off part of the reflected lights L1 and L2 from the reflecting surface 40. The shade is provided with an edge that forms the upper horizontal cut-off line of the diffused light distribution pattern WP.

(Description of the operation of the first embodiment)
The vehicular lamp 1 according to the first embodiment is configured as described above, and the operation thereof will be described below.

  The light source 2 is turned on to emit light. Then, the light emitted from the light source 2 is reflected toward the projection lens 3 by the reflecting surface 40 of the reflector 4. The reflected lights L 1 and L 2 enter the projection lens 3 from the incident surface 30 of the projection lens 3. The incident light is emitted from the exit surfaces 31, 31H, 31V of the projection lens 3 to the outside, that is, the front of the vehicle, as emitted light L3, L4.

  Here, the outgoing lights L3 and L4 from the outgoing surfaces 31 and 31H in the cross section are diffused in the horizontal direction (left and right direction and horizontal direction) with respect to the optical axis Z. For example, the outgoing light L3 is diffused by an angle θB ° in the lateral direction (right direction) with respect to the optical axis Z. For this reason, the light (emitted light L3, L4) emitted from the emission surface 31 of the projection lens 3 is diffused in the horizontal direction without crossing each other in the cross section. In addition, the outgoing light (not shown) from the outgoing surfaces 31 and 31V in the longitudinal section is slightly diffused in parallel or substantially parallel to the optical axis Z or in the longitudinal direction (vertical direction, vertical direction). Yes.

  The emitted lights L3 and L4 form a diffused light distribution pattern WP (so-called wide light distribution pattern) diffused in the lateral direction. This diffused light distribution pattern WP constitutes a low beam light distribution pattern together with the condensed light distribution pattern SP.

(Description of the effect of Embodiment 1)
The vehicular lamp 1 according to the first embodiment is configured and operated as described above, and the effects thereof will be described below.

  In the vehicular lamp 1 according to the first embodiment, since the shape of the cross section of the exit surfaces 31 and 31H of the projection lens 3 is a convex curve projecting toward the light exit direction, the light is diffused in the lateral direction. The light distribution pattern, that is, the diffusion light distribution pattern WP can be reliably formed.

  Here, the shape of the cross section of the exit surfaces 31 and 31H of the projection lens 3 is aspherical or substantially similar to the shape of the longitudinal section of the exit surfaces 31 and 31V, as shown by the two-dot chain line in FIG. The case of an aspheric cross-sectional line shape will be described. In this case, the light beams L5 and L6 emitted from the emission surfaces 31 and 31V of the projection lens 3 are compared with the light beams L3 and L4 emitted from the emission surfaces 31 and 31H of the projection lens 3 of the vehicle lamp 1 according to the first embodiment. And close to the optical axis Z side. For example, the outgoing light L5 is diffused by an angle θA ° in the lateral direction (rightward direction) with respect to the optical axis Z. This angle θA ° is smaller than the angle θB °. For this reason, it is difficult for the outgoing lights L5 and L6 from the outgoing surface 31 of the projection lens 3 in this case to reliably form a wide light distribution pattern in which the light is diffused in the lateral direction, that is, the diffused light distribution pattern WP. .

  On the other hand, the vehicular lamp 1 according to the first embodiment has a convex curve shape in which the cross-sectional shape of the emission surfaces 31 and 31H of the projection lens 3 protrudes toward the light emission direction. As shown by the solid line and two-dot chain line in FIG. 3, the convex curved exit surfaces 31 and 31H are closer to the light irradiation direction (front side) than the aspherical surface or the substantially aspherical exit surfaces 31 and 31V. It protrudes. For this reason, the outgoing lights L3 and L4 from the convex curved exit surfaces 31 and 31H are on the optical axis Z as compared with the outgoing lights L5 and L6 from the aspherical surface or the substantially aspherical outgoing surfaces 31 and 31V. On the other hand, it is diffused in the lateral direction and emitted. Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

  Moreover, the vehicular lamp 1 according to the first embodiment is a projector-type vehicular lamp. For this reason, the reflected lights L 1 and L 2 that are light from the light source 2 and reflected by the reflecting surface 40 of the reflector 4 enter the projection lens 3. The incident light exits from the exit surfaces 31, 31H, 31V of the projection lens 3 as exit light L3, L4 diffused in the lateral direction in the cross section. Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

  In the vehicular lamp 1 according to the first embodiment, the emitted lights L3 and L4 from the emission surfaces 31, 31H, and 31V of the projection lens 3 are diffused in the lateral direction with respect to the optical axis Z. For this reason, the outgoing lights L3 and L4 emitted from the emission surfaces 31, 31H and 31V of the projection lens 3 are diffused in the horizontal direction without crossing each other in the cross section. Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

(Description of configuration, action, and effect of modification)
The dashed-two dotted line in FIG. 3 shows the modification of the vehicle lamp concerning this invention. Hereinafter, the vehicular lamp according to this modification will be described.

  As shown in FIGS. 1 (B), 2 and 3, the vehicular lamp 1 according to the first embodiment has the shape of the cross section of the exit surfaces 31 and 31H of the projection lens 3 that is light (emitted light L3, L4) has a convex curve shape protruding toward the emission direction side (front side). On the other hand, in the vehicular lamp according to this modification, as shown by the two-dot chain line in FIG. 3, the cross-sectional shape of the emission surfaces 31 and 31V of the projection lens 3 is the emission shown in FIG. Similar to the shape of the vertical cross section of the surfaces 31 and 31V, it has an aspherical surface or a substantially aspherical cross sectional line shape. The vertical cross-sectional shape of the exit surface of the projection lens 3 of the vehicle lamp according to this modification is the same as the longitudinal cross-sectional shape of the exit surfaces 31 and 31V of the projection lens 3 of the vehicle lamp 1 of the first embodiment. Similarly, it has an aspherical surface or a substantially aspherical cross-sectional line shape.

  Further, in the vehicular lamp according to this modified example, the rear focal point FH of the cross section of the projection lens 3 indicated by the two-dot chain line in FIG. 3 has the rear focal point FH of the projection lens 3 shown in FIG. Are located on the rear side of the rear focal point FV of the emission surfaces 31 and 31V in the longitudinal section. For this reason, the vehicular lamp according to this modification has the rear focal length B of the emission surfaces 31 and 31V in the cross section of the projection lens 3 shown by the two-dot chain line in FIG. 3 (see FIG. 1B). Is longer than the rear focal length A of the exit surfaces 31 and 31V in the longitudinal section of the projection lens 3 shown in FIG.

  Since the vehicular lamp according to this modification is configured as described above, it is possible to achieve substantially the same operations and effects as the vehicular lamp 1 of the first embodiment. That is, in the vehicular lamp according to this modification, the emitted light emitted from the emission surfaces 31 and 31V in the cross section of the projection lens 3 indicated by the two-dot chain line in FIG. 3 is the vehicle lamp of the first embodiment. The light is diffused in the lateral direction with respect to the optical axis Z and emitted in substantially the same manner as the emitted lights L3 and L4 emitted from the emission surfaces 31 and 31H in the cross section of one projection lens 3. Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

  Moreover, the vehicle lamp according to this modification is a projector-type vehicle lamp. For this reason, the reflected lights L 1 and L 2 that are light from the light source 2 and reflected by the reflecting surface 40 of the reflector 4 enter the projection lens 3. The incident light is emitted light diffused in the transverse direction in the transverse section from the emitting surfaces 31 and 31V in the transverse section of the projection lens 3 indicated by the two-dot chain line in FIG. 3 (that is, the vehicle of the first embodiment). (Emission light substantially the same as the emission lights L3 and L4 emitted from the emission surfaces 31 and 31H in the cross section of the projection lens 3 in the lamp 1). Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

  The vehicular lamp according to this modification is light emitted from the emission surfaces 31 and 31V in the cross section of the projection lens 3 shown by a two-dot chain line in FIG. 3 (that is, the projection in the vehicular lamp 1 of the first embodiment). (Emission light substantially similar to the emission lights L3 and L4 emitted from the emission surfaces 31 and 31H in the cross section of the lens 3) is diffused in the lateral direction with respect to the optical axis Z. For this reason, the emitted light from the emission surfaces 31 and 31V in the cross section of the projection lens 3 shown by the two-dot chain line in FIG. 3 is diffused in the horizontal direction without crossing each other in the cross section. Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

(Description of configuration, action, and effect of embodiment 2)
FIG. 5 shows Embodiment 2 of the vehicular lamp according to the present invention. Hereinafter, the vehicular lamp according to the second embodiment will be described.

  As shown in FIGS. 1 (B), 2 and 3, the vehicular lamp 1 according to the first embodiment has the shape of the cross section of the exit surfaces 31 and 31H of the projection lens 3 that is light (emitted light L3, L4) is a convex curve shape protruding toward the emission direction side (front side), that is, R or substantially R. In the vehicular lamp according to the modification, as shown by a two-dot chain line in FIG. 3, the cross-sectional shape of the emission surfaces 31 and 31V of the projection lens 3 is the emission surfaces 31 and 31V shown in FIG. Similarly to the shape of the vertical cross section, the cross section line shape of an aspherical surface or almost aspherical surface is formed.

  On the other hand, in the vehicular lamp according to the second embodiment, as shown in FIG. 5, the shape of the cross-section of the exit surfaces 31, 31 HC, and 31 HS of the projection lens 300 is on the light exit direction side (front side). The shape is a combination of a protruding convex curve shape and an aspherical or almost aspherical cross-sectional line shape. In other words, the cross-sectional shape of the emission surfaces 31 and 31HC at the center is an aspherical surface or a substantially aspherical cross-sectional line shape. Thereby, it is possible to maintain (maintain) the luminous intensity (concentration) at the center of the light distribution pattern. The shape of the cross section of the emission surfaces 31 and 31HS on both sides is a convex curve shape protruding in the light emission direction side, that is, R or substantially R. Thereby, a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP can be formed. Two two-dot chain lines in FIG. 5 indicate boundaries between the emission surfaces 31 and 31HC at the center and the emission surfaces 31 and 31HS at both sides.

  In addition, the shape of the vertical cross section of the emission surface of the projection lens 300 in the vehicle lamp according to the second embodiment is the emission of the projection lens 3 in the vehicle lamp 1 of the first embodiment and the vehicle lamp of the modification. Similar to the shape of the longitudinal cross section of the surfaces 31 and 31V, it has an aspherical surface shape or a substantially aspherical cross sectional line shape.

  Since the vehicular lamp according to the second embodiment is configured as described above, it is possible to achieve substantially the same operations and effects as the vehicular lamp 1 of the first embodiment and the vehicular lamp of the modified example. it can. That is, in the vehicular lamp according to the second embodiment, the emitted light emitted from the emission surfaces 31 and 31HC at the central portion of the emission surfaces 31, 31HC and 31HS in the cross section of the projection lens 300 is incident on the optical axis Z. On the other hand, it is emitted substantially in parallel. On the other hand, of the exit surfaces 31, 31HC, 31HS in the cross section of the projection lens 300, the exit light emitted from the exit surfaces 31, 31HS on both sides crosses the projection lens 3 in the vehicle lamp 1 of the first embodiment. It is diffused in the transverse direction with respect to the optical axis Z and emitted in substantially the same manner as the emitted lights L3 and L4 emitted from the emission surfaces 31 and 31H. Accordingly, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP, while maintaining the light intensity (concentration) at the center of the light distribution pattern.

  Moreover, the vehicle lamp according to this modification is a projector-type vehicle lamp. For this reason, the reflected lights L 1 and L 2 that are light from the light source 2 and reflected by the reflecting surface 40 of the reflector 4 enter the projection lens 300. The incident light is emitted substantially parallel to the optical axis Z from the central exit surfaces 31, 31 HC among the exit surfaces 31, 31 HC, 31 HS in the cross section of the projection lens 300. Outgoing light diffused laterally from the exit surfaces 31 and 31HS on both sides of the exit surfaces 31, 31HC and 31HS (that is, the exit surface of the cross section of the projection lens 3 in the vehicle lamp 1 of the first embodiment) 31 and 31H is emitted as substantially the same outgoing light as the outgoing lights L3 and L4). Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

  In the vehicular lamp according to the second embodiment, light emitted from the emission surfaces 31, 31HC, 31HS of the projection lens 300 (that is, the emission surface 31 in the cross section of the projection lens 3 in the vehicle lamp 1 of the first embodiment). , 31H is emitted substantially in the same manner as the outgoing lights L3 and L4). For this reason, the light emitted from the emission surfaces 31, 31HC, 31HS in the cross section of the projection lens 300 is diffused in the horizontal direction without crossing each other in the cross section. Thereby, it is possible to reliably form a wide light distribution pattern in which light is diffused in the lateral direction, that is, a diffused light distribution pattern WP.

(Embodiments 1 and 2 and description of examples other than modified examples)
In the first and second embodiments and modifications, the diffused light distribution pattern WP constituting the low beam light distribution pattern is irradiated together with the light collection light distribution pattern SP. However, in the present invention, a light distribution pattern other than the diffused light distribution pattern WP may be irradiated.

  In the first and second embodiments and modifications, a semiconductor light source is used as the light source 2. However, in the present invention, a light source other than the semiconductor light source, such as a bulb light source or a discharge lamp light source, may be used as the light source 2.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Light source 3,300 Projection lens 30 Incident surface 31 Outgoing surface 31H Outgoing surface 31HC Outgoing surface (emission surface of a center part)
31HS exit surface (exit surfaces on both sides)
31V Outgoing surface 32 Flange part 33 Side surface 4 Reflector 40 Reflecting surface A Rear focal length B Rear focal length CL1 Lower horizontal cutoff line CL2 Oblique cutoff offline CL3 Upper horizontal cutoff offline E Elbow point F1 First focus F2 Second focus FH Rear Side focus FV Rear focus HL-HR Left and right horizontal lines of screen L1, L2 Reflected light L3, L4, L5, L6 Outgoing light SP Condensed light distribution pattern VU-VD Vertical lines of screen WP Diffuse light distribution pattern Z light Axis θA °, θB ° Angle

Claims (3)

A reflector having a reflecting surface based on an ellipse;
A light source disposed at or near the first focal point of the reflecting surface;
A projection lens for emitting the reflected light from the reflecting surface to the outside from the emitting surface;
With
The shape of the cross section of the exit surface of the projection lens is a non-spherical or almost aspheric cross-sectional line shape,
The shape of the longitudinal section of the exit surface of the projection lens is an aspherical surface or a substantially aspherical sectional line shape,
The rear focal length of the cross section of the projection lens is longer than the rear focal length of the vertical cross section of the projection lens;
A vehicular lamp characterized by the above. A reflector having a reflecting surface based on an ellipse;
A light source disposed at or near the first focal point of the reflecting surface;
A projection lens for emitting the reflected light from the reflecting surface to the outside from the emitting surface;
With
The shape of the cross section of the exit surface of the projection lens is a combination of a convex curve shape projecting toward the light exit direction and an aspheric or substantially aspheric cross section line shape, and the central portion is an aspheric surface or It has a substantially aspherical cross-sectional line shape, a convex curve shape with both sides protruding to the light exit direction side,
The shape of the longitudinal section of the exit surface of the projection lens is an aspherical surface or a substantially aspherical sectional line shape,
A vehicular lamp characterized by the above. The light emitted from the exit surface of the projection lens is diffused in the transverse direction without crossing each other in the cross section.
The vehicular lamp according to claim 1 or 2 .

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