JP2019192471A - Lighting fixture for vehicle - Google Patents

Abstract

To provide a lighting fixture for a vehicle capable of emitting light in a proper direction.SOLUTION: A lighting fixture 1 for a vehicle comprises an LED socket 10 as a light source having a plurality of LEDs 13, and a lens 20L as a light guide member having an incidence surface 20i for light emitted from the LED socket 10. The incidence surface 20i includes a first incidence region 21 as some of a plurality of rotational parabolic surfaces, and rotation axes RA of the respective rotational parabolic surfaces overlap with emission surfaces 13o of the respective LEDs 13 projected on the incidence surface 20i along optical axes of the light emitted from the respective LEDs 13 and extend along optical-axis directions of the light from LEDs 13 made incident on the incidence surface 20i.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular lamp that can emit light in an appropriate direction.

  2. Description of the Related Art As a vehicular lamp such as a marker lamp, a rear fog lamp, and a headlight, a vehicular lamp having an LED socket in which a plurality of LEDs are assembled is known.

  Patent Document 1 listed below describes such a vehicular lamp. The vehicular lamp includes a lens facing the LED socket. This lens has a convex surface portion that is a light incident surface centered on the optical axis of light emitted from the LED socket. The light emitted from the LED socket is refracted and propagates into the lens when entering from the convex surface portion. This convex surface part makes the emitted light from LED located in the center among several LED enter as light substantially parallel to said optical axis.

JP-A-2018-26216

  As described above, the lens described in the above-mentioned patent document has a light incident surface having a convex curved surface centered on the optical axis of light emitted from the LED socket. However, the optical axis of the light emitted from the LED socket is the optical axis of all the light emitted from the plurality of LEDs. For this reason, the light emitting surface of each LED located around the LED located at the center among the LEDs arranged at a position not overlapping the optical axis is a convex incident surface of the lens. Is off center. For this reason, the light emitted from such an LED easily propagates in the optical path in a direction deviated from a desired direction after entering the lens from the convex surface portion. Thus, when light propagates along an optical path deviated from a desired optical path, the design of the exit surface becomes complicated, and there is a possibility that part of the light emitted from the exit surface propagates in a direction deviated from an appropriate direction.

  Accordingly, an object of the present invention is to provide a vehicular lamp that can emit light in an appropriate direction.

  To achieve the above object, a vehicular lamp according to the present invention includes a light source having a plurality of LEDs, and a light guide member having an incident surface for light emitted from the light source, and the incident surface has a plurality of rotations. The rotation axis of each of the paraboloids includes a part of a paraboloid, and the light emission of each LED projected onto the incident surface along the optical axis of the light emitted from each LED. It overlaps with a surface and extends along the optical axis direction of light from the LED incident on the incident surface.

  According to such a vehicle lamp, at least a part of the light emitted from each LED enters the light guide member from the paraboloid of revolution. The rotation axis of the paraboloid of revolution overlaps with the light emission surface of the LED projected onto the incident surface as described above, and is along the optical axis direction of the light from the LED incident on the incident surface. For this reason, the propagation direction in the light guide member of the light which radiate | emits from each LED and injects from each rotation paraboloid is light guide member compared with the light which propagates the inside of the lens of the said patent document 1 In the direction parallel to the optical axis of the light just before entering the light. When the light propagates in such a direction, it becomes easier to control the light on the exit surface than when the light propagation direction cannot be brought close to the optical axis of the light before entering the light guide member. The light can be easily emitted from the light guide member in a desired direction. Therefore, the vehicular lamp of the present invention can emit light in an appropriate direction.

  Moreover, it is preferable that the said incident surface further contains the connection surface which connects the at least 2 said paraboloid of revolution.

  When the positions of the plurality of LEDs are close, the rotation axis of each paraboloid on the incident surface is close. In this case, part of the light emitted from the predetermined LED is likely to enter from a paraboloid having the optical axis of the adjacent LED as the rotation axis. Thus, the light incident from the paraboloid having the optical axis of the adjacent LED as the rotation axis easily propagates in an unintended direction in the light guide member. Therefore, by providing a connection surface for connecting at least two rotary paraboloids as described above, when the connection surface is not provided, the light beam is emitted from a predetermined LED and the optical axis of the adjacent LED is set as the rotation axis. At least part of the light incident from the paraboloid to be incident can be incident from the connection surface. Therefore, by appropriately adjusting the connection surface, the optical path of the light incident from the connection surface can be made closer to the direction parallel to the optical axis of the light emitted from the LED.

  In this case, the connection surface may be convex, and the connection surface may be concave.

  Since the connection surface is convex, the divergence angle of light incident on the connection surface can be reduced, and the position of the emission surface facing the connection surface can be brightened. On the other hand, since the connection surface is concave, the divergence angle of light incident on the connection surface can be increased, and uneven brightness can be suppressed at a position facing the connection surface on the emission surface.

  Further, it is preferable that the connection surface has a rotationally symmetric shape, and light emitted from each of the plurality of LEDs is incident on the light guide member from a rotationally symmetric position with respect to the rotation axis of the connection surface.

  In this case, the entire light propagating in the light guide member can be a rotationally symmetric shape. By the way, since the light emitted from the LED is a light that spreads radially, the entire light propagating in the light guide member has a rotationally symmetric shape, so that uneven distribution of brightness can be suppressed. The lamp can shine efficiently.

  In addition, the incident surface does not include the apexes of the plurality of paraboloidal surfaces, and the connection surface is positioned on the optical axis of each light emitted from the LED and incident on the incident surface. Is preferred.

  The light on the optical axis of the LED is higher in intensity than the light around the optical axis. Therefore, since the incident surface does not include the respective apexes of the plurality of paraboloids, it is possible to disperse and propagate light having high intensity on the optical axis within the light guide member. Therefore, in the light emitted from the light guide member, it is possible to suppress the flashing of the light corresponding to the optical axis of the LED.

  Alternatively, the incident surface may include vertices of the plurality of paraboloids, and the paraboloids may be positioned on the optical axes.

  In this case, high intensity light on the optical axis of the LED can propagate in a direction parallel to the optical axis of the light incident on the incident surface of the light guide member in the light guide member. That is, high intensity light can propagate in a direction that is easy to control. Therefore, high intensity light can be emitted in a desired direction.

  The light guide member may be a lens having an exit surface at a position facing the entrance surface.

  Alternatively, the light guide member may be a light guide having an exit surface other than the position facing the entrance surface.

  As described above, according to the present invention, it is possible to provide a vehicular lamp that can emit light in an appropriate direction.

It is a figure which shows the example of the vehicle carrying the vehicle lamp in 1st Embodiment of this invention. It is a partial exploded view of the vehicle lamp in 1st Embodiment of this invention shown in FIG. It is sectional drawing of the vehicle lamp in the III-III line of FIG. It is an enlarged view of the LED socket and lens of FIG. It is the figure which looked at the lens of FIG. 3 from the entrance plane side. It is the figure which looked at the lens of FIG. 3 from the output surface side. It is a figure which shows the mode of the vehicle lamp in 2nd Embodiment of this invention similarly to FIG. FIG. 8 is an enlarged view of the LED socket, lens, and light guide of FIG. 7. It is a figure which shows the mode of the vehicle lamp in 3rd Embodiment of this invention similarly to FIG. FIG. 10 is an enlarged view of the LED socket and the light guide of FIG. 9. It is an enlarged view which shows the 1st modification of an entrance plane. It is an enlarged view which shows the 2nd modification of an entrance plane. It is an enlarged view which shows the 3rd modification of an entrance plane.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the vehicle headlamp which concerns on this invention is illustrated with an accompanying drawing. The embodiments exemplified below are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved from the following embodiments without departing from the spirit of the present invention.

(First embodiment)
FIG. 1 is a diagram illustrating an example of a vehicle on which a vehicular lamp according to this embodiment is mounted. FIG. 1 is a view of the vehicle VE as viewed from the rear side. As shown in FIG. 1, the vehicle VE of the present embodiment includes a vehicle lamp 1. The vehicular lamp 1 of the present embodiment is configured to include a marker lamp, and one vehicular lamp 1 is provided in each of the left and right directions on the back surface of the vehicle VE. Each vehicle lamp 1 is exposed to the outside of the vehicle VE, and emits light from the marker lamp toward the outside of the vehicle VE.

  2 is an exploded view of a part of the vehicular lamp 1 in the present embodiment shown in FIG. 1, and FIG. 3 is a cross-sectional view of the vehicular lamp 1 taken along line III-III in FIG. As shown in FIGS. 2 and 3, the vehicular lamp 1 of this embodiment includes an LED socket 10, a lens unit 20, an outer cover 2, and a lamp body 3 as main components.

  The outer cover 2 and the lamp body 3 are made of, for example, resin, and the outer cover 2 is attached to the lamp body 3 by fusion or screwing. Thus, a predetermined space is formed by the outer cover 2 and the lamp body 3. The outer cover 2 is formed from a light transmissive member. As described above, the vehicular lamp 1 according to the present embodiment includes a marker lamp. Therefore, the area | region which covers the back lamp of the outer cover 2 is formed in colorless and transparent. Further, the area covering the brake lamp and tail lamp of the outer cover 2 is colored light transmissive red. Alternatively, when the brake lamp and tail lamp covered with the outer cover 2 are lit in red, the area covering the brake lamp and tail lamp of the outer cover 2 may be colorless and transparent. The area covering the direction indicator lamp of the outer cover 2 is colored in light-transmitting orange. Also in this case, when the direction indicator lamp covered with the outer cover 2 is lit in orange, the area covering the direction indicator lamp of the outer cover 2 may be colorless and transparent. Alternatively, the outer cover 2 may cover the rear fog lamp. In this case, the area | region which covers the rear fog lamp of the outer cover 2 is colored light transmissive red. Or when the rear fog lamp covered with the outer cover 2 lights in red, the area | region which covers the rear fog lamp of the outer cover 2 may be colorless and transparent.

  The LED socket 10 includes a socket main body 11, a heat sink 12, and a plurality of LEDs 13 as main components. Therefore, the LED socket 10 can be understood as a light source having a plurality of LEDs 13. In the heat sink 12, a plurality of plate materials are stacked with a space therebetween, and when the space between the plate materials is filled, the heat sink 12 has a generally cylindrical shape as a whole. The socket body 11 has a generally cylindrical outer shape smaller in diameter than the heat sink 12 and is fixed to the heat sink 12. A plurality of fitting protrusions 11p are provided on the outer peripheral portion of the socket body 11, and a plurality of LEDs 13 are disposed on the LED mount 14 opposite to the heat sink side of the socket body 11. The socket body 11 is inserted into the opening 3H formed in the lamp body 3 together with the fitting protrusion 11p. Thus, the LED socket 10 is fixed to the lamp body 3 by the fitting protrusion 11p being caught by the lamp body 3 in a state where the socket body 11 is inserted into the opening 3H. In a state where the LED socket 10 is fixed to the lamp body 3 in this way, the plurality of LEDs 13 are arranged in a space formed by the outer cover 2 and the lamp body 3.

  The lens unit 20 includes a light transmissive lens 20L and a bridge 20B as main components. The lens 20L is made of, for example, acrylic having a refractive index of 1.49, polycarbonate having a refractive index of 1.586, or the like. In the lens unit 20 of the present embodiment, the bridge 20B has a pair of bridges 20B having a rectangular shape fixed to the lens 20L with the lens 20L interposed therebetween. In the present specification, the hatching of the lens 20L is omitted in order to avoid complicated drawings. For example, the bridge 20 </ b> B and the lens 20 </ b> L may be made of a light transmissive resin and fixed to each other by integral molding. As shown in FIG. 3, in the present embodiment, the lens unit 20 is disposed in a space formed by the outer cover 2 and the lamp body 3, and a pair of bridges 20 </ b> B are fixed to the lamp body 3. The In a state where the bridge 20B is fixed to the lamp body 3, the lens 20L faces the respective LEDs 13.

  FIG. 4 is an enlarged view of the LED socket 10 and the lens 20L of FIG. As described above, the socket body 11 is provided with a plurality of LEDs 13 as light sources, and the lenses 20L face the respective LEDs 13. Therefore, the light emitted from the LEDs 13 enters the lens 20L. For this reason, the surface on the LED 13 side of the lens 20L is the incident surface 20i, the surface of the lens 20L on the opposite side to the LED 13 side is the emitting surface 20o, and light propagates from the incident surface 20i to the emitting surface 20o. Therefore, the lens 20L can be understood as a light guide member. Each LED 13 is connected to a wiring (not shown), and current is supplied to each LED 13 via the wiring.

  FIG. 5 is a diagram of the lens 20L viewed from the incident surface 20i side. In FIG. 5, each LED 13 projected onto the lens 20 </ b> L along the optical axis of the light emitted from each LED 13 and the emission surface 13 o of the LED 13 are indicated by broken lines. In the present embodiment, the four LEDs 13 are arranged at rotationally symmetric positions around the central axis CL. That is, each LED 13 is arranged such that the light emission surface 13o of the LED 13 is positioned on each vertex of a square centered on the central axis CL. For this reason, the light emitted from each of the plurality of LEDs 13 enters the lens 20L from the incident surface 20i at a rotationally symmetric position with respect to the central axis CL.

  As shown in FIGS. 4 and 5, the incident surface 20 i includes a plurality of first incident areas 21, second incident areas 22, and third incident areas 23.

  Each first incident area 21 is a part of a rotating paraboloid with respect to the rotation axis RA. In the present embodiment, each first incident area 21 includes a vertex 21t of the rotating paraboloid. Yes. This apex 21t overlaps with each exit surface 13o projected onto the lens 20L as described above. Therefore, the rotation axis RA of the paraboloid that forms each first incident region 21 also overlaps each emission surface 13o projected onto the lens 20L as described above. Each rotation axis RA extends along the optical axis direction of the light from each LED 13 incident on the incident surface 20i. In the present embodiment, the paraboloid of the first incident region 21 is formed from the optical axis of the light emitted from each LED 13 and incident on the lens 20L when the lens 20L is made of, for example, acrylic or polycarbonate as described above. It is shaped to be parallel to the optical axis after light up to 30 degrees is incident.

  Further, as described above, since the plurality of LEDs 13 are arranged in a rotationally symmetrical manner around the central axis CL, each first incident region 21 has a rotationally symmetric shape with respect to the central axis CL. Thus, they are connected to each other so as to surround the second incident region 22. In this state where the first incident areas 21 are connected, the outer shapes of the plurality of first incident areas 21 are circular.

  The second incident region 22 is surrounded by the first incident regions 21 as described above, and is in contact with the inner periphery of the plurality of first incident regions 21. For this reason, the 2nd incident area | region 22 can be understood as a connection surface which connects each 1st incident area | region 21. FIG. In the present embodiment, the second incident region 22 is convex and has a rotationally curved shape with the central axis CL as the rotational axis, for example, a rotational paraboloid. Further, as described above, each first incident region 21 is rotationally symmetrical with respect to the central axis CL, and therefore the second incident region 22 connected to the first incident region 21 is also the central axis CL. This is a rotationally symmetric shape with respect to

  The third incident area 23 has a cylindrical shape whose cylindrical inner surface extends toward the LED socket 10 side, and is in contact with the outer circumferences of the plurality of first incident areas 21. Accordingly, the plurality of first incident areas 21 are surrounded by the third incident area 23.

  The third incident area 23 is surrounded by the internal reflection area 24. The internal reflection region 24 has a shape of a side surface of the truncated cone, and extends toward the side opposite to the LED socket 10 side. The internal reflection region 24 is connected to the bridge 20B.

  FIG. 6 is a view of the lens 20L as viewed from the exit surface 20o side. As shown in FIGS. 4 and 6, the emission surface 20 o includes a first emission region 25, a second emission region 26, and a third emission region 27.

  The first emission region 25 has a circular outer shape centered on the central axis CL, and has a convex shape of a rotational curved surface having the central axis CL as a rotation axis. Further, the first emission region 25 overlaps a part of each first incident region 21 and the second incident region 22, and also overlaps with the top 21 t of the paraboloid of revolution that forms the first incident region 21.

  The second emission region 26 is connected to the first emission region 25 via the side surface 25 w and surrounds the first emission region 25. The second emission region 26 is connected to the side surface 25w, surrounds the first emission region 25, a first block 26a in which a plurality of convex lenses extend circumferentially, and surrounds the first block 26a in a predetermined direction. And a second block composed of a plurality of cylindrical lenses extending along the same. The outer periphery of the second block 26b is a circle centered on the central axis CL.

  The third emission region 27 is connected to the outer periphery of the second emission region 26 via the side surface 26 w and surrounds the second emission region 26. The third emission region 27 is formed in a ring shape by connecting a plurality of convex fisheye lenses. The third emission region 27 is connected to the bridge 20B.

  Next, operation | movement of the vehicle lamp 1 of this embodiment is demonstrated.

  When current is supplied to each LED 13 of the LED socket 10 by the operation of the vehicle VE or the operation of a switch in the vehicle, each LED 13 emits light. The light emitted from each LED 13 is emitted with a predetermined divergence angle as shown by a one-dot chain line in FIG. For this reason, the light emitted from each LED 13 enters the lens 20L from the first incident region 21, the second incident region 22, and the third incident region 23 of the incident surface 20i. The optical axes of the respective lights emitted from the respective LEDs 13 and immediately before entering the incident surface 20i are along the rotation axis RA. In addition, the light radiate | emitted from LED13 in the following description is shown with a dashed-dotted line in a figure.

  As described above, the first incident region 21 is a part of the paraboloid of revolution with respect to the rotation axis RA, and extends along the optical axis direction of the light from the LED 13. In the present embodiment, the light incident on the first incident region 21 is formed so as to be parallel to the optical axis after the light of 30 degrees from the optical axis is incident. The light incident on the lens 20L from the region 21 is refracted in the first incident region 21, propagates in the lens 20L in a direction substantially parallel to the optical axis of the light before entering the lens 20L, and travels toward the exit surface 20o. . Moreover, even if it is the light which injects into the 1st incident area | region 21 exceeding 30 degree | times from an optical axis, the said light is closely approached in the direction parallel to an optical axis in the lens 20L. Thus, the light propagating in the lens 20L is emitted from the first emission region 25 and the second emission region 26. The light emitted from the first emission region 25 converges and diverges and propagates after passing through the condensing point because the first emission region 25 is convex as described above. In addition, the light emitted from the first block 26a in the second emission region is partially converged and then propagated while diverging, and the light emitted from the second block 26b is partially converged for each cylindrical lens. Then it propagates while diverging.

  The light emitted from the LED 13 and incident from the second incident region 22 propagates in a direction different from the optical axis of the light before entering the lens 20L in the lens 20L. Specifically, it propagates as follows. As described above, since the second incident region 22 has a convex shape, out of the light emitted from the LED 13, the light enters the lens 20 </ b> L from the side of the LED 13 that emits the light with respect to the central axis CL in the second incident region 22. In the lens 20L, the angle formed between the light and the optical axis after incidence is larger than the angle formed between the light and the optical axis before entering the lens 20L before incidence. Propagate inside. On the other hand, of the light emitted from the LED 13, the light that enters the lens 20 </ b> L from the opposite side of the LED 13 that emitted the light from the central axis CL in the second incident region 22 is the optical axis of the light before entering. The light is refracted so as to approach the direction and propagates in the lens 20L. These lights are emitted in the direction of divergence from the first emission region 25.

  The light emitted from the LED 13 and incident from the third incident area 23 is internally reflected by the internal reflection area 24 and propagates in a direction substantially parallel to the optical axis of the light before entering the lens 20L. The light is emitted from the three emission regions 27. The light emitted from the third emission region 27 converges once for each light emitted from each fisheye lens and then diverges.

  The light emitted from the LED 13 as described above, incident on the lens 20L from the incident surface 20i, and emitted from the emission surface 20o is emitted outside the vehicle VE through the outer cover 2.

  As described above, the vehicular lamp 1 according to the present embodiment includes the LED socket 10 that is a light source having a plurality of LEDs, and the lens 20 </ b> L that is a light guide member having a light incident surface 20 i emitted from the LED socket 10. Is provided. The incident surface 20i includes a first incident region 21 that is a part of a plurality of rotating paraboloids, and the rotation axis RA of each rotating paraboloid is along the optical axis of the light emitted from each LED 13. It overlaps with the light emission surface 13o of each LED 13 projected onto the incident surface 20i, and extends along the optical axis direction of the light from the LED 13 incident on the incident surface 20i.

  According to such a vehicular lamp 1, at least part of the light emitted from each LED 13 enters the lens 20L that is a light guide member from the first incident region 21 that is a paraboloid of revolution. The axis of rotation RA of this paraboloid overlaps with the exit surface 13o of the LED 13 projected onto the entrance surface 20i as described above, and is along the optical axis direction of the light from the LED 13 that enters the entrance surface 20i. For this reason, the propagation direction in the lens 20L of the light emitted from the respective LEDs 13 and incident from the respective first incident regions 21 is brought close to a direction parallel to the optical axis of the light immediately before entering the lens 20L. In the present embodiment, as described above, the light propagation direction in the lens 20L of the light incident from each first incident region 21 is substantially parallel to the optical axis of the light immediately before entering the lens 20L. When light propagates in such a direction, the light is transmitted from the lens 20L in a desired direction as compared with the case where the light propagates in a direction non-parallel to the optical axis of the light before entering the lens 20L in the lens 20L. It can be easily emitted. Therefore, the vehicular lamp 1 of this embodiment can emit light in an appropriate direction.

  Moreover, the vehicular lamp 1 of the present embodiment further includes a second incident region 22 as a connection surface that connects the first incident region 21 that is at least two paraboloids. For this reason, compared with the case where the lens 20L does not include the second incident region 22 and the first incident regions 21 are directly connected to each other, a part of the light emitted from the predetermined LED 13 is opposed to the adjacent LED 13. It can suppress entering from the paraboloid which makes the optical axis of the incident area | region 21 a rotating shaft. Therefore, by appropriately adjusting the second incident region 22, the optical path of the light incident from the second incident region 22 can be made closer to the direction parallel to the optical axis of the light emitted from the LED 13.

  Furthermore, in this embodiment, the 2nd incident area | region 22 which is a connection surface is convex shape. For this reason, the divergence angle of the light which injects into the 2nd incident area | region 22 can be made small, and the position facing the 2nd incident area | region 22 in the output surface 20o can be made bright.

  In the present embodiment, the second incident region 22 that is the connection surface has a rotationally symmetric shape, and the light emitted from each of the plurality of LEDs 13 is based on the central axis CL that is the rotational axis of the second incident region 22. The light enters the lens 20L from the rotationally symmetric position. For this reason, in the vehicular lamp 1 of the present embodiment, the entire light propagating in the lens 20L can have a rotationally symmetric shape. By the way, since the light emitted from the LED 13 is light that spreads radially, the entire light propagating in the lens 20L has a rotationally symmetric shape, so that uneven distribution of brightness on the emission surface 20o can be suppressed. The vehicle lamp 1 can shine efficiently.

  Further, in the present embodiment, the incident surface 20i includes the vertices 21t of the rotational paraboloids in the plurality of first incident regions 21, and the rotational paraboloids are disposed on the optical axes of the light emitted from the LEDs 13, respectively. The first incident region 21 is located. Therefore, the light on the optical axis with high intensity of the LED 13 can propagate in the lens 20L in a direction parallel to the optical axis of the light emitted from the LED 13 and incident on the lens 20L. That is, high intensity light can propagate in a direction that is easy to control. Therefore, high intensity light can be emitted in a desired direction.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted unless specifically described.

  FIG. 7 is a view showing the state of the vehicular lamp 1 of the present embodiment in the same manner as FIG. As shown in FIG. 7, the vehicular lamp 1 of the present embodiment is mainly different from the vehicular lamp 1 of the first embodiment in that a light guide 30 is provided. The light guide 30 is made of a light transmissive material and has an incident surface 30i and an output surface 30o. The entrance surface 30i faces the lens 20L, and the exit surface 30o extends to face the outer cover 2.

  FIG. 8 is an enlarged view of the LED socket, lens, and light guide of FIG. As shown in FIG. 8, the lens 20L of the present embodiment is different from the emission surface 20o of the lens 20L of the first embodiment in that the emission surface 20o is planar. The exit surface 20o is perpendicular to the optical axis of the light from the LED 13 that enters the lens 20L. Accordingly, in the lens 20L, the light propagating along the direction of the optical axis of the light before entering the lens 20L propagates in the direction perpendicular to the emission surface 20o and is emitted from the emission surface 20o. Therefore, this light hardly refracts at the exit surface 20o.

  In addition, the incident surface 30i of the light guide 30 is a planar surface having substantially the same size as the exit surface 20o of the lens 20L, and faces the exit surface 20o substantially in parallel. Further, in the vicinity of the incident surface 30i of the light guide 30, the longitudinal direction of the light guide 30 extends in a direction perpendicular to the incident surface 30i. Therefore, on the incident surface 30 i side of the light guide 30, the longitudinal direction of the light guide 30 extends along the direction of the optical axis of each light emitted from each LED 13 and before entering the light guide 30.

Further, the side opposite to the outer cover 2 side with respect to the emission surface 30o of the light guide 30 is a reflection surface 30r, and a plurality of reflection steps are formed although not particularly shown. However, as long as the light propagating through the light guide 30 is emitted from the emission surface 30o, the light may not be reflected by the reflection surface 30r. For this reason, a plurality of reflection steps are not essential. In order for light propagating through the light guide 30 without being reflected by the reflecting surface 30r to be emitted from the emitting surface 30o, for example, fillers that refract or reflect light are dispersed in the vicinity of the emitting surface 30o of the light guide 30. May be.

  In the vehicular lamp 1 of the present embodiment, the light emitted from each LED 13 is incident on the lens 20L as described in the first embodiment. Accordingly, the light incident from the first incident region 21 and the light incident from the third incident region 23 and reflected by the internal reflection region 24 are emitted from the respective LEDs 13 and before entering the lens 20L. It propagates in the lens 20L along the direction of the optical axis. These lights propagate in a direction perpendicular to the exit surface 20o, and are emitted from the exit surface 20o with almost no refraction at the exit surface 20o. Moreover, the light incident from the second incident region 22 propagates in a direction different from the optical axis of the light before entering the lens 20L in the lens 20L. Accordingly, when the light is emitted from the emission surface 20o, the light is refracted and emitted.

  The light emitted from the lens 20L enters the light guide 30 from the incident surface 30i facing the lens 20L as described above. As described above, the entrance surface 30i of the light guide 30 faces the exit surface 20o of the lens 20L substantially in parallel. For this reason, the light incident from the first incident region 21 and the third incident region 23 and emitted from the exit surface 20o of the lens 20L in the direction perpendicular to the exit surface 20o is almost refracted at the entrance surface 30i of the light guide 30. Without entering the light guide 30. Further, the light that enters from the second incident region 22 and exits in the direction non-perpendicular to the exit surface 20 o is refracted again on the entrance surface 30 i of the light guide 30 and enters the light guide 30. At this time, if the lens 20L and the light guide 30 have the same refractive index, the propagation direction of the light exiting in the light guide 30 in the direction non-perpendicular to the exit surface 20o is substantially the same as the propagation direction in the lens 20L. It is.

  The light propagating through the light guide 30 exits from the exit surface 30 o of the light guide 30. Light emitted from the emission surface 30 o of the light guide 30 is emitted outside the vehicle VE through the outer cover 2.

  As described above, the vehicular lamp 1 according to the present embodiment includes the light guide 30 having the incident surface 30i facing the exit surface 20o of the lens 20L. As described in the first embodiment, the lens 20L can easily emit light in a desired direction. Therefore, light can be appropriately incident on the light guide 30.

  Further, as described above, the light exit surface 20o of the lens 20L of the present embodiment is perpendicular to the optical axis of the light from the LED 13 incident on the lens 20L. Therefore, as described above, the lens 20L can emit light incident from the first incident region 21 and the third incident region 23 perpendicularly to the emission surface 20o. For this reason, light can be incident from the incident surface 30i of the light guide 30 facing the emission surface 20o so as not to exceed the numerical aperture (NA) of the light guide 30. Therefore, light can be efficiently incident on the light guide 30 and the light guide 30 can be illuminated more brightly.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the description of the present embodiment, the same or equivalent components as those in the second embodiment are denoted by the same reference numerals, and redundant description is omitted unless specifically described.

  FIG. 9 is a view showing the state of the vehicular lamp 1 in the present embodiment in the same manner as in FIG. 3, and FIG. 10 is an enlarged view of the LED socket and the light guide in FIG. As shown in FIGS. 9 and 10, the vehicular lamp 1 of the present embodiment is different from the vehicular lamp 1 of the second embodiment in that the lens 20L and the light guide 30 of the second embodiment are integrated. For this reason, in this embodiment, the lens 20L and the light guide 30 can be understood as one light guide 40, and the incident surface 20i can be understood as the incident surface of the light guide 40. Therefore, on the incident surface 20 i side of the light guide 40, the longitudinal direction of the light guide 40 extends along the direction of the optical axis of each light before exiting from each LED 13 and entering the light guide 40.

  In the vehicular lamp 1 according to this embodiment, the light emitted from each LED 13 enters the light guide 40 from the incident surface 20i as described in the first embodiment. Therefore, the light incident from the first incident region 21 and the light incident from the third incident region 23 and reflected by the internal reflection region 24 are emitted from the respective LEDs 13 and before entering the light guide 40. The light guide 40 propagates along the direction of the optical axis. In addition, the light incident from the second incident region 22 propagates in a direction different from the optical axis of the light before entering the light guide 40 in the light guide 40. The light propagating through the light guide 40 is emitted from the emission surface 30 o of the light guide 40. Light emitted from the emission surface 30 o of the light guide 40 is emitted outside the vehicle VE through the outer cover 2.

  As described above, the vehicular lamp 1 of the present embodiment includes the light guide 40 having the incident surface 20i similar to the incident surface 20i of the first embodiment. Therefore, as described above, the lens 20 </ b> L can propagate the light incident from the first incident region 21 and the third incident region 23 along the extending direction of the light guide 40.

  In the present embodiment, a light guide 40 in which the lens 20L and the light guide 30 are integrated is provided. Therefore, the loss of light is suppressed as compared with the second embodiment, and the light guide 40 can be brightened.

  The present invention has been described above by taking the first to third embodiments as examples, but the present invention is not limited to these.

  For example, in the above-described embodiment, the incident surface 20i includes the respective apexes 21t of the rotary paraboloid as the plurality of first incident regions 21, and each light before being emitted from the respective LEDs 13 and incident from the incident surface 20i. A paraboloid of revolution was located on the optical axis. However, the present invention is not limited to this. For example, although the incident surface 20i includes the above rotating paraboloid, the incident surface 20i may not include the apex 21t of the rotating paraboloid. FIG. 11 is an enlarged view showing a first modification of the incident surface 20i having such a configuration. In the description of the present modification, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted unless specifically described. In FIG. 11, the 1st incident area | region 21 which is a rotation paraboloid concealed in the 2nd incident area | region 22 which is a connection surface is shown with the broken line. As shown in FIG. 11, in this modification, the vertex 21 t of the paraboloid of the first incident region 21 is hidden in the second incident region 22. In this case, the second incident region 22 may be positioned on the optical axis of each light before entering from the incident surface 20i. As described above, when the second incident region 22 that is the connection surface is positioned on the optical axis of each light emitted from each LED 13 and incident on the incident surface 20 i, on the optical axis of the light emitted from each LED 13. Light enters from the second incident region 22. The light on the optical axis of the LED 13 is higher in intensity than the light around the optical axis. Therefore, since the incident surface 20i does not include the respective apexes 21t of the plurality of paraboloids, light having high intensity on the optical axis can be dispersed and propagated in the lens 20L. Therefore, in the light emitted from the lens 20L, it is possible to suppress the spotlight in which the light corresponding to the optical axis of the LED 13 is strongly emitted.

  Moreover, in the said embodiment, the 2nd incident area | region 22 which is a connection surface was made into convex shape. However, the present invention is not limited to this, and the second incident region 22 may be concave. FIG. 12 is an enlarged view showing a second modification of the incident surface 20i having such a configuration. In the description of the present modification, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted unless specifically described. As shown in FIG. 12, the second incident region 22 is concave. In the example of FIG. 12, the incident surface 20 i includes the vertices 21 t of the paraboloid of revolution as the first incident regions 21. However, the incident surface 20i does not include the apex 21t, and the second incident region 22 may be positioned on the optical axis of each light before entering from the incident surface 20i. In this case, the second incident region 22 of the incident surface 20i has, for example, a shape indicated by a broken line in FIG. Since the second incident region 22 that is the connection surface is concave in this way, the divergence angle of the light incident on the second incident region 22 can be increased, and the second incident region 22 on the exit surface 20o is opposed to the second incident region 22. The uneven brightness distribution at the position can be suppressed.

  Or the 2nd incident area | region 22 which is a connection surface may be made into planar shape. FIG. 13 is an enlarged view showing a third modification of the incident surface 20i having such a configuration. In the description of the present modification, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted unless specifically described. As shown in FIG. 13, the second incident region 22 is planar. In the example of FIG. 13, the incident surface 20 i includes the vertices 21 t of the paraboloid of revolution as the first incident regions 21. However, the incident surface 20i does not include the apex 21t, and the second incident region 22 may be positioned on the optical axis of each light before entering from the incident surface 20i. In this case, the second incident region 22 of the incident surface 20i has, for example, a shape indicated by a broken line in FIG.

  Moreover, in the said embodiment and the said modification, although the entrance plane 20i contains the 2nd entrance area | region 22 which is a connection surface, the entrance plane 20i does not contain the 2nd entrance area | region 22, but the 1st entrance areas 21 mutually. You may touch directly.

  Moreover, in the said embodiment, although several LED13 was arrange | positioned in the rotationally symmetrical position on the basis of the central axis CL, in this invention, several LED13 does not need to be arrange | positioned in rotational symmetry. In this case, even if the second incident region 22 is included as in the embodiment and the modification example, the second incident region 22 may not have a rotationally symmetric shape with respect to the central axis CL.

  Moreover, although the LED socket 10 was demonstrated to the example in the said embodiment as a light source which has several LED13, the light source of this invention is not limited to LED socket 10, and as long as it has several LED13, for example on a board | substrate A light source having a plurality of LEDs 13 may be used.

  Moreover, in the said embodiment, although it was set as the structure which the light radiate | emitted from LED13 injects directly from the entrance plane 20i, the light radiate | emitted from LED13 may reflect and refract, and may inject from the entrance plane 20i. Therefore, in the above-described embodiment, it has been described that each rotation axis RA extends along the optical axis direction of the light from each LED 13 incident on the incident surface 20i. However, the optical axis of this light is incident on the incident surface 20i. It is the optical axis of the light immediately before entering.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which can radiate | emit light in an appropriate direction is provided, and can be utilized in the field | area of vehicle headlamps, such as a motor vehicle.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Outer cover 3 ... Lamp body 10 ... LED socket 11 ... Socket main-body part 12 ... Heat sink 13 ... LED
13o ... Outgoing surface 20 ... Lens unit 20L ... Lens 20i ... Incident surface 20o ... Outgoing surface 21 ... First incident region (rotating paraboloid)
21t ... vertex 22 ... second incident area (connection surface)
23... Third entrance region 24... Internal reflection region 25... First exit region 26... Second exit region 27... Third exit region 30. Surface 30o ... Outgoing surface 40 ... Light guide RA ... Rotation axis VE ... Vehicle

Claims (9)

A light source having a plurality of LEDs;
A light guide member having an incident surface for light emitted from the light source;
With
The incident surface includes a part of a plurality of paraboloids of revolution,
The rotation axis of each of the paraboloids overlaps with the light exit surface of each LED projected onto the entrance surface along the optical axis of the light exiting from each LED, and enters the entrance surface. A vehicle lamp characterized by extending along an optical axis direction of light from the LED. The vehicular lamp according to claim 1, wherein the incident surface further includes a connection surface connecting at least two of the paraboloids of revolution. The vehicular lamp according to claim 2, wherein the connection surface is convex. The vehicular lamp according to claim 2, wherein the connection surface is concave. The connecting surface is rotationally symmetric;
The light emitted from each of the plurality of LEDs enters the light guide member from a rotationally symmetric position with respect to the rotation axis of the connection surface. The vehicle lamp as described. 6. The incident surface according to claim 2, wherein the incident surface does not include a vertex of each of the plurality of paraboloids, and the connection surface is located on each of the optical axes. The vehicle lamp as described. The said incident surface contains each vertex of these rotation paraboloids, and the said rotation paraboloid is each located on the said optical axis, The one of Claim 1 to 5 characterized by the above-mentioned. The vehicle lamp as described. The vehicular lamp according to any one of claims 1 to 7, wherein the light guide member is a lens having an exit surface at a position facing the entrance surface. The vehicular lamp according to any one of claims 1 to 7, wherein the light guide member is a light guide having an exit surface other than a position facing the entrance surface.

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