JP2008166072A - Light guide and vehicular lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide capable of emitting light across a wide range, without affected by the position of an incidence surface. <P>SOLUTION: There are provided a second emitting surface 10 which emits light L2 incident from a second incidence surface 12 as well as a first emitting surface 8 which emits light L1 incident from a first incidence surface 11. There are also provided a first reflecting surface 9 which reflects the light away from an optical axis K while it advances from the second incidence surface 12 to the second emitting surface 10, and a second reflecting surface 13 which reflects the light reflected on the first reflecting surface 9 toward the second emitting surface 10. Thus, the light is emitted across a wide range without being affected by the position of the second incidence surface 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light guide and a vehicular lamp including the light guide.

  Examples of the vehicle lamp include a high-mount stop lamp, a stop lamp, a turn signal lamp, and a tail lamp.

  As a light guide used in this type of vehicle lamp, Patent Document 1 discloses that light from a single LED is internally generated by a convex surface as an incident surface and a concave surface as an incident surface formed around the convex surface. The lens cut part of the structure taken in is disclosed.

In this lens cut portion, the light incident from the convex surface passes through the lens as it is and exits from the front surface of the lens cut portion, while the light incident from the concave surface is reflected by the reflective surface, and then the lens cut. It is taken out from the front of the part. In such a structure, the light is more diffused by bringing the concave surface toward the inside (LED side).
Japanese Patent Laid-Open No. 60-130001 (page 2, FIG. 3)

  However, in the above technique described in Patent Document 1, since the LEDs are arranged inside the concave surface, if the concave surface is moved inward, the concave surface and the LED interfere with each other, and the light emitted from the lens cut portion is irradiated. There is a problem that the range is also limited.

  An object of the present invention is to obtain a light guide and a vehicular lamp that can irradiate light over a wide range without being affected by the position of an incident surface.

  The invention according to claim 1 is a bottom wall portion in which a light source is disposed on the back surface side, a first tube portion erected on a peripheral edge portion of the front surface of the bottom wall portion, and the bottom wall portion. A first incident surface on which a part of the light emitted from the light source is incident and a rear surface of the bottom wall portion, which is formed around the first incident surface and emitted from the light source. A second incident surface on which a part of the light is incident, an optical axis that passes through the light source and the first incident surface and is substantially parallel to a central axis of the first cylindrical portion, and Light incident on the incident surface is formed on the first exit surface from which the light exits, the second exit surface from which the light exits, and the light incident on the second entrance surface. And a second reflecting surface that reflects light reflected by the first reflecting surface toward the second emitting surface. A light guide, characterized in that it comprises a.

  According to a second aspect of the present invention, in the light guide according to the first aspect, the first emission surface is formed on the front surface of the bottom wall portion, and is the center of the first cylindrical portion. It is located on an axis, and the second emission surface is formed in an annular shape over the entire circumference of the top surface of the first cylindrical portion.

  According to a third aspect of the present invention, in the light guide according to the first aspect, the light guide is disposed inside the first cylindrical portion at a position spaced from the bottom wall portion, and covers the bottom wall portion. A cover member is provided, and the first emission surface is formed on the cover member.

  According to a fourth aspect of the present invention, in the light guide according to the first or third aspect of the present invention, the first light guide is erected on the front surface of the bottom wall portion and located inside the first cylindrical portion. A second cylindrical portion parallel to the cylindrical portion, a third emission surface that is formed in an annular shape over the entire circumference of the top surface of the second cylindrical portion, and is reflected by the first reflecting surface A third reflecting surface that reflects the emitted light toward the third emitting surface, and the first emitting surface is arranged in a radial direction of the first tube portion with the first tube portion. A plurality of second emission surfaces are provided along the circumferential direction of the first cylinder portion in a state of being located between the second cylinder portions, and the second emission surface is the entire circumference of the top surface of the first cylinder portion It is formed in the cyclic | annular form covering.

  According to a fifth aspect of the present invention, in the light guide according to the first aspect of the present invention, the first cylindrical portion that is erected on the front surface of the bottom wall portion and is located inside the first cylindrical portion. A second cylindrical portion parallel to the second cylindrical portion, an annular shape extending over the entire circumference of the top surface of the second cylindrical portion, and reflected by the first reflecting surface from which light is emitted and the first reflecting surface. A third reflecting surface for reflecting the reflected light toward the third emitting surface, and a space between the first tube portion and the second tube portion that is erected on the front surface of the bottom wall portion And a third tube portion that is parallel to the first tube portion, and the first emission surface extends along the circumferential direction of the third tube portion on the top surface of the third tube portion. A plurality of the second emission surfaces are formed in an annular shape over the entire circumference of the top surface of the first cylindrical portion.

  The invention according to claim 6 is a vehicular lamp comprising a light source and a light guide that emits light incident from the light source, wherein the light guide has a bottom on which the light source is disposed on the back side. A part of light emitted from the light source is formed on the back surface of the wall portion, the first cylindrical portion standing on the periphery of the front surface of the bottom wall portion, and the bottom wall portion. A first incident surface, a second incident surface that is formed around the first incident surface on the back surface of the bottom wall portion, and on which a part of the light emitted from the light source is incident, the light source, A first exit surface that is disposed on an optical axis that passes through the first entrance surface and is substantially parallel to a central axis of the first cylindrical portion, and from which light incident on the first entrance surface exits; An annular second emission surface formed on the top surface of the one cylindrical portion and emitting light, and a method of separating the light incident on the second incidence surface from the optical axis A first reflection surface that reflects light and a second reflection surface that reflects light reflected by the first reflection surface toward the second emission surface, and the light guide includes a plurality of light guides. A vehicular lamp characterized in that a part of the second light exit surfaces of the light guides that are provided individually and are adjacent to each other are overlapped in the optical axis direction.

  According to the present invention, the first reflecting surface and the second reflecting surface are provided between the second incident surface and the second emitting surface, so that the light is not affected by the position of the incident surface. Can be irradiated over a wide range.

  (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a tail lamp that is a vehicular lamp according to the present embodiment, FIG. 2 is a perspective view of a light guide, FIG. 3 is a front view of the light guide, and FIG. 4 is a rear view of the light guide. 5 is an enlarged sectional view of the bottom wall portion, FIG. 6 is an enlarged sectional view of the second emission surface, and FIG. 7 is an optical path diagram passing through the bottom wall portion.

  The tail lamp 1 of the present embodiment is arranged in a rearward state on both the left and right sides of the rear part of the vehicle body. In the present embodiment, only one of them will be described as a representative. The tail lamp 1 includes a container-like housing 2 opened at the rear, a light guide 3 installed in the housing 2, and an LED (Light Emitting Diode) 4 as a light source installed on the bottom surface of the housing 2. And a cover 5 that closes the opening of the housing 2.

  The LED 4 is disposed on the bottom of the housing 2 in a state of being separated from the back surface of the bottom wall 25 of the light guide 3.

  The housing 2 is made of synthetic resin. The cover 5 is made of a transparent resin.

  The light guide 3 is a single molded product made of a transparent resin such as methacrylic resin or polycarbonate resin. The light guide 3 is supported on the housing 2 by a bracket (not shown).

  The light guide 3 includes a disk-shaped bottom wall portion 6 and a single cylindrical first tube portion 7 erected on the periphery of the front surface of the bottom wall portion 6. ing. The center axis of the bottom wall portion 6 and the center axis of the first tube portion 7 are coincident with each other. The optical axes of the light guide 3 and the LED 4 coincide with each other.

  The light guide 3 includes a first incident surface 11 on which a part of light emitted from the LED 4 is incident as a main light emitting unit, and a first emission surface from which light incident on the first incident surface 11 is emitted. 8 are formed. The light guide 3 has a second incident surface 12 on which a part of the light emitted from the LED 4 is incident as a sub-light emitting portion, and a second incident surface from which the light incident on the second incident surface 12 is emitted. An exit surface 10 and first and second reflecting surfaces 9 and 13 for guiding light incident on the second entrance surface 12 to the second exit surface 10 are formed.

  The first incident surface 11 is formed at the center of the back surface of the bottom wall portion 6. The first incident surface 11 has a Fresnel prism shape. With this Fresnel prism shape, the first incident surface 11 directs the light from the LED 4 to the first emission surface 8 as substantially parallel light.

  The first emission surface 8 is formed at the center of the front surface of the bottom wall portion 6, passes through the LED 4 and the first incident surface 11, and is an optical axis substantially parallel to the central axis of the first tube portion 7. Located on K. In the present embodiment, the optical axis K and the central axis of the first cylindrical portion 7 coincide with each other. The first exit surface 8 is provided with a diffusing prism shape as a light diffusing means. The shape of the diffusion prism diffuses light emitted from the first emission surface 8. The shape of the diffusing prism is simple, and is advantageous in terms of moldability of the light guide 3.

  The second incident surface 12 is formed around the first incident surface 11 on the back surface of the bottom wall portion 6 so as to surround the first incident surface 11. The second incident surface 12 is tapered so that the incident angle of light from the LED 4 approaches 90 °.

  The second emission surface 10 is formed on the top surface of the first cylindrical portion 7 and has an annular shape over the entire circumference of the top surface of the first cylindrical portion 7. The second emission surface 10 is separated from the first emission surface 8, the first incidence surface 11, and the first reflection surface 9 in a direction orthogonal to the optical axis K. The second emission surface 10 is provided with fine unevenness (texture shape) as a light diffusion shape. The unevenness diffuses light emitted from the second emission surface 10.

  The first reflecting surface 9 is formed around the first emitting surface 8 on the front surface of the bottom wall portion 6, and the first emitting surface 8 and the second reflecting surface 9 are orthogonal to the optical axis K. It is located between the emission surface 10. The first reflecting surface 9 has a tapered shape surrounding the first emitting surface 8, and the inner surface side is a reflecting surface. The first reflecting surface 9 reflects the light incident on the second incident surface 12 in a direction away from the optical axis K.

  The second reflecting surface 13 is formed on the peripheral edge portion on the back surface of the bottom wall portion 6. The second reflecting surface 13 is formed in a taper shape with the inner surface side as the reflecting surface. The second reflecting surface 13 reflects the light reflected by the first reflecting surface 9 toward the second emitting surface 10.

  In such a configuration, when the LED 4 is lit, the light L1 that has entered the first incident surface 11 out of the light emitted from the LED 4 enters the bottom wall portion 6 due to the Fresnel prism shape of the first incident surface 11. Incident as parallel light. Since the light L1 enters the bottom wall portion 6 as parallel light, the incident light L1 reaches the first emission surface 8 without being scattered to the other, and the incident efficiency is improved.

  The light L1 that has entered the bottom wall portion 6 as parallel light from the first incident surface 11 is diffused by the shape of the diffusion prism of the first emission surface 8 and is irradiated to the outside of the light guide 3. Since the light L1 enters the first emission surface 8 as parallel light, it is easy to control the light L1. That is, a light distribution pattern having a necessary shape and a degree of diffusion can be obtained depending on the shape of the first emission surface 8 and the degree of the diffusion prism shape. The light L1 emitted from the first emission surface 8 in a diffused state is transmitted through the cover 5 and then irradiated outward with a predetermined light distribution pattern.

  On the other hand, the light L2 incident on the second incident surface 12 out of the light emitted from the LED 4 is surely the second incident surface because the second incident surface 12 is in an inclined state corresponding to the LED 4. 12 enters the bottom wall 6 and the loss of light due to reflection is small.

  The light that has entered the bottom wall portion 6 from the second incident surface 12 is reflected by the first reflecting surface 9 and the second reflecting surface 13 in the bottom wall portion 6, and then in the first cylindrical portion 7. Then, the light is emitted from the second light exit surface 10 to the outside of the light guide 3. Since the second exit surface 10 is provided with fine unevenness (texture shape) as a light diffusion shape, the light L2 from the second exit surface 10 is diffused and passes through the cover 5. Irradiated in an annular shape toward the outside of the light guide 3. The first reflecting surface 9 and the second reflecting surface 13 guide all the light L2 incident from the second incident surface 12 into the first cylindrical portion 7, so that the front surface of the bottom wall portion 6 Of these, portions other than the first emission surface 8 are non-light emitting portions.

  In the present embodiment described above, the light irradiation range is determined by the position of the second emission surface 10 with respect to the first emission surface 8, but how far the second emission surface is from the first emission surface 8. The position of the second incident surface 12 is irrelevant to the setting of whether to make it.

  That is, according to the present embodiment, the second exit surface 10 is provided in addition to the first exit surface 8, and the first reflection is performed from the second entrance surface 12 to the second exit surface 10. Since the surface 9 and the second reflecting surface 13 are provided, light can be irradiated over a wide range without being affected by the position of the second incident surface 12.

  In the present embodiment, the first emission surface 8 is formed on the front surface of the bottom wall portion 6 and is located on the central axis of the first cylinder portion 7, and the second emission surface. Since the surface 10 is formed in an annular shape over the entire circumference of the top surface of the first cylindrical portion 7, the light L <b> 2 from the second emission surface 10 around the light L <b> 1 emitted from the first emission surface 8. Is irradiated.

  (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a cross-sectional view showing the internal structure of the tail lamp according to the present embodiment, and FIG. 9 is a front view of the light guide. Note that the tail lamp according to the present embodiment includes the same components as those of the first embodiment. Therefore, about the same component, the common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The tail lamp 14 according to the present embodiment uses the light guide 15 that is substantially the same as that of the previous embodiment, but the light guide 15 of the present embodiment covers the bottom wall portion 6 of the light guide 15. A cover member 17 is provided, and the first emission surface 18 is provided on the cover member 17. And in this embodiment, the center part of the front surface of the bottom wall part 6 which is a part corresponded to the 1st output surface 8 of previous embodiment becomes the flat passage surface 16.

  The cover member 17 is formed in a disk shape, is disposed inside the first tube portion 7 at a position spaced from the bottom wall portion 6, and covers the bottom wall portion 6. The cover member 17 is formed of the same transparent resin as the other parts of the light guide 15 and is supported by the first cylindrical portion 7 via a holding component (not shown).

  A central portion of the front surface of the cover member 17 has a columnar convex portion 17a in a range corresponding to the passage surface 16. The front surface of the convex portion 17 a is a first emission surface 18. The first exit surface 18 has a diffusing prism shape.

  In such a configuration, the light L1 incident as parallel light from the first incident surface 11 is irradiated as parallel light as it is from the passage surface 16 and then diffused to the first emission surface 18 of the cover member 17. It is diffused by the prism shape and irradiated to the outside.

  According to the present embodiment described above, the bottom wall portion 6 of the light guide 15 is closed by the cover member 17, so that dust can be prevented from adhering to the bottom wall portion 6.

  (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a cross-sectional view showing the internal structure of the tail lamp according to this embodiment, and FIG. 11 is a front view of the light guide. Note that the tail lamp according to the present embodiment includes the same components as those of the first embodiment. Therefore, about the same component, the common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The tail lamp 19 according to the present embodiment includes two light guides 20 and two LEDs 4. The two light guides 20 and the LEDs 4 are housed in a housing and a cover (not shown). The two light guides 20 are arranged so that the optical axes K are parallel to each other.

  The first cylindrical portion 21 of the light guide 20 is formed to have substantially the same length as the plate thickness of the bottom wall portion 6, and the light guide 20 is formed thin as a whole. In addition, the second light exit surfaces 22 of the two light guides 20 are partially overlapped in the direction of the optical axis K.

  In such a configuration, as shown in FIG. 11, it is possible to create a light emission of an expression in which the annular second emission surfaces 22 of the two light guides 20 are overlapped, and there is a three-dimensional effect in a wide area. Luminescence can be obtained.

  (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a cross-sectional view showing the internal structure of the tail lamp according to the present embodiment, FIG. 13 is a front view of the light guide, and FIG. 14 is a rear view of the light guide. Note that the tail lamp according to the present embodiment includes the same components as those of the first embodiment. Therefore, about the same component, the common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The light guide 24 of the tail lamp 23 according to the present embodiment includes a disc-shaped bottom wall portion 25, a large-diameter cylindrical first tube portion 26 erected on the periphery of the bottom wall portion 25, and a bottom wall. A small-diameter cylindrical second tube portion 27 erected on the front surface of the portion 25. The second cylindrical portion 27 is located inside the first cylindrical portion 26 and is parallel to the first cylindrical portion 26. Of the bottom wall portion 25, the inner central portion 25 a of the small-diameter second cylindrical portion 27 has a flat plate shape on both sides.

  The light guide 24 has, as a main light emitting portion, a first incident surface 32 on which a part of light emitted from the LED 4 is incident, and a first emission from which light incident on the first incident surface 32 is emitted. A surface 30 is formed. The light guide 3 has a second incident surface 33 on which a part of the light emitted from the LED 4 is incident as a sub-light emitting unit, and second and second light on which the light incident on the second incident surface 33 is emitted. The third exit surfaces 28, 29, and the first to third reflecting surfaces 31, 34, 35 for guiding the light incident on the second entrance surface 33 to the second exit surface 28 or the third exit surface 29; , Is formed.

  A plurality of first incident surfaces 32 are provided on the back surface of the bottom wall portion 25. These first incident surfaces 32 are positioned in the circumferential direction of the first cylindrical portion 26 in a state of being positioned between the first cylindrical portion 26 and the second cylindrical portion 27 in the radial direction of the first cylindrical portion 26. It is provided at equal intervals along. Specifically, in the present embodiment, 18 first incident surfaces 32 are provided. Each first incident surface 32 is formed in a circular shape. The first incident surface 32 has a Fresnel prism shape. An LED 4 is provided for each of the first incident surfaces 32. The LED 4 is disposed directly behind each first incident surface 32.

  The first exit surface 30 is formed on the front surface of the bottom wall portion 25 so as to correspond to each first entrance surface 32. Specifically, the first exit surface 30 is positioned between the first tubular portion 26 and the second tubular portion 27 in the radial direction of the first tubular portion 26. A plurality are provided along the circumferential direction. The first emission surface 30 passes through the LED 4 and the first incident surface 32 and is located on the optical axis K substantially parallel to the central axis of the first cylindrical portion 26. The first exit surface 30 is provided with a diffusing prism shape which is a light diffusing means.

  The second incident surface 33 is formed around each first incident surface 32 on the back surface of the bottom wall portion 25 so as to surround the first incident surface 32. The second incident surface 33 is tapered such that the incident angle of light from the LED 4 approaches 90 °.

  The second emission surface 28 is formed on the top surface of the first cylindrical portion 26, while the third emission surface 29 is formed on the top surface of the second cylindrical portion 27. The second and third emission surfaces 28 and 29 have an annular shape over the entire circumference of the top surfaces of the first and second cylindrical portions 26 and 27. The second and third emission surfaces 28 and 29 are separated from the first emission surface 30, the first incident surface 32, and the first reflection surface 31 in the direction orthogonal to the optical axis K. The second and third emission surfaces 28 and 29 are provided with fine unevenness (texture shape) as a light diffusion shape for diffusing light.

  The first reflecting surface 31 is formed around the first emitting surface 30 on the front surface of the bottom wall portion 25. The first reflecting surface 31 has a tapered shape surrounding the first emitting surface 30, and the inner surface side is a reflecting surface. The first reflecting surface 31 reflects the light incident on the second incident surface 33 in a direction away from the optical axis K.

  The second and third reflecting surfaces 34 and 35 are provided at portions corresponding to the bases of the first and second cylindrical portions 26 and 27 on the back surface of the bottom wall portion 25, and radiate from the center of the bottom wall portion 25. In the direction, a plurality of pairs are formed facing each other so as to sandwich each first incident surface 32. The second and third reflecting surfaces 34 and 35 are curved in an arc shape centering on each optical axis K corresponding to them. The second reflecting surface 34 reflects the light L <b> 2 reflected by the first reflecting surface 31 toward the second emitting surface 28, while the third reflecting surface 35 reflects by the first reflecting surface 31. The reflected light L <b> 2 is reflected toward the third emission surface 29.

  In such a configuration, when the LED 4 is lit, the light L1 incident on the first incident surface 32 out of the light from the LED 4 is collimated into the bottom wall portion 25 due to the Fresnel prism shape of the first incident surface 32. As incident. Since the light L1 enters the bottom wall portion 25 as parallel light, the incident light L1 reaches the first emission surface 30 without being scattered to the other, and the incident efficiency is improved.

  The light L1 incident as parallel light from the first incident surface 32 is diffused by the shape of the diffusion prism of the first output surface 30 and irradiated to the outside. Since the first light exit surface 30 is incident as parallel light, the light can be easily controlled. That is, a light distribution pattern having a required shape and a degree of diffusion can be obtained depending on the shape of the first emission surface 30 and the degree of the diffusion prism shape. The light L1 emitted from the first emission surface 30 in a diffused state passes through a transparent cover (not shown) and is then irradiated outward with a predetermined light distribution pattern.

  On the other hand, the light L2 incident on the second incident surface 33 out of the light from the LED 4 is reliably inclined from the second incident surface 33 because the second incident surface 33 is in an inclined state facing the LED 4. The light enters the bottom wall portion 25 between the first tube portion 26 and the second tube portion 27, and the loss of light due to reflection is small.

  The light that has entered the bottom wall portion 25 from the second incident surface 33 first enters the first cylindrical portion 26 side and the second cylindrical portion 27 side by the first reflecting surface 31 in the bottom wall portion 25. Reflected towards. The light L2 reflected toward the first and second cylindrical portions 26 and 27 is reflected by the second and third reflecting surfaces 34 and 35, respectively, and then is reflected on the first and second cylindrical portions 26 and 27. Along the second and third light exit surfaces 28 and 29. Since the second and third reflecting surfaces 34 and 35 are curved in an arc shape with the optical axis K as the center, each of the first and second reflecting surfaces 34 and 35 can be surely scattered without scattering the light L2 reflected by the first reflecting surface 31. 1 can be reflected toward the cylindrical portions 26 and 27.

  Since each of the second and third emission surfaces 28 and 29 is provided with fine unevenness (texture shape) as a light diffusion shape, the light L2 from the second and third emission surfaces 28 and 29 is In a diffused state, the light passes through a cover (not shown) and is then irradiated outward in a double annular shape. In order to guide all the light L2 incident from the second incident surface 33 to the first and second cylindrical portions 26, 27 side by the first reflecting surface 31, the second and third reflecting surfaces 34, 35, Of the front surface of the bottom wall portion 25, portions other than the first emission surface 30 are non-light emitting portions.

  As described above, in the present embodiment, the second and third emission surfaces 28 and 29 are formed on the top surfaces of the first and second cylindrical portions 26 and 27, and the first emission surface is provided therebetween. 30 is formed, the light emitted from the second and third emission surfaces 28 and 29 is irradiated around the light L1 emitted from the first emission surface 30 in a double annular shape. Therefore, light can be irradiated over a wide range.

  (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIGS. 15 is a cross-sectional view showing the internal structure of the tail lamp according to the present embodiment, FIG. 16 is a front view of the light guide, and FIG. 17 is a rear view of the light guide. Note that the tail lamp according to this embodiment includes the same components as those of the fourth embodiment. Therefore, about the same component, the common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The tail lamp 36 according to the present embodiment uses a light guide 37 that is substantially the same as that of the fourth embodiment. However, the light guide 37 of the present embodiment includes the first cylindrical portion 26 and the second light guide 37. A cylindrical third cylindrical portion 38 having an intermediate diameter between the cylindrical portion 27 and the cylindrical portion 27 is formed on the front surface of the bottom wall portion 41. The third cylindrical portion 38 is erected in parallel with the first and second cylindrical portions 26 and 27.

  And the 1st output surface 39 corresponding to each 1st incident surface 32 is formed in the top surface of this 3rd cylinder part 38 at equal intervals along the circumferential direction of the 3rd cylinder part 38. As shown in FIG. . The first emission surface 39 has a diffusing prism shape.

  The first reflecting surface 40 is not formed corresponding to each LED 4, but has a shape inclined from the first and second tube portions 26 and 27 toward the third tube portion 38. It has become. That is, both sides of the third cylindrical portion 38 are inclined with the base of the third cylindrical portion 38 as a valley. Other configurations are the same as those of the fourth embodiment.

  According to this embodiment, the 2nd and 3rd output surfaces 28 and 29 are formed in the top face of the 1st and 2nd cylinder parts 26 and 27, and the top face of the 3rd cylinder part 38 between them Since the first emission surface 39 is formed in the second and third emission surfaces 28 and 29 around the light L1 emitted from the first emission surface 39 as in the fourth embodiment. The irradiated light is irradiated in a double annular shape. Therefore, light can be irradiated over a wide range.

  (Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 18 is a cross-sectional view showing the internal structure of the tail lamp according to this embodiment, and FIG. 19 is a front view of the light guide. Note that the tail lamp according to this embodiment includes the same components as those of the fourth embodiment. Therefore, about the same component, the common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The tail lamp 42 according to this embodiment uses a light guide 43 that is substantially the same as that of the fourth embodiment. However, the light guide 43 according to this embodiment includes the bottom wall portion 6 of the light guide 43. A cover member 45 for covering is provided, and a first emission surface 46 is provided on the cover member 45. In the present embodiment, a plurality of flat passage surfaces 44 are formed on the front surface of the bottom wall portion 25 corresponding to the first emission surface 30 of the fourth embodiment.

  The cover member 45 is formed in an annular shape and is disposed between the first cylindrical portions 26 and 27 inside the first cylindrical portion 7. The cover member 45 is located at a position separated from the bottom wall portion 6 and covers the bottom wall portion 25. The cover member 45 is formed of the same transparent resin as the other portions of the light guide 43 and is supported by the first and second cylindrical portions 26 and 27 via holding parts (not shown).

  On the front surface of the cover member 45, a cylindrical convex portion 45 a is formed at a position corresponding to each passing surface 16. The front surface of the convex portion 45 a is the first emission surface 46. The first exit surface 18 has a diffusing prism shape.

  In such a configuration, the light L1 incident as parallel light from the first incident surface 32 passes through the passage surface 44 as it is as parallel light, and then is provided on the first exit surface 46 of the cover member 45 as a diffusion prism shape. And is irradiated from the first light exit surface 46 to the outside of the light guide 43.

  According to the present embodiment described above, a part of the bottom wall portion 25 of the light guide 43 is closed by the cover member 45, so that dust can be prevented from adhering to the bottom wall portion 25.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made.

  For example, in each said embodiment, although the example in which the 1st-3rd cylinder part was formed in the cylindrical shape was shown, it is not limited to this, A cross-sectional polygonal shape may be sufficient as a 1st-3rd cylinder part. .

  In each of the above embodiments, an example of a diffusing prism shape is shown as the light diffusing shape formed on the first emitting surface, but the present invention is not limited to this, and the light diffusing shape formed on the first emitting surface is as follows: For example, a Fresnel prism shape having a function of once converging light and then diffusing it may be used.

Sectional drawing which shows the tail lamp as a vehicle lamp concerning the 1st Embodiment of this invention. The perspective view of a light guide. The front view of a light guide. The rear view of a light guide. The expanded sectional view of a bottom wall part. The expanded sectional view of the 2nd output surface. The optical path figure which passes a bottom wall part. Sectional drawing which shows the internal structure of the tail lamp which concerns on the 2nd Embodiment of this invention. The front view of a light guide. Sectional drawing which shows the internal structure of the tail lamp which concerns on the 3rd Embodiment of this invention. The front view of a light guide. Sectional drawing which shows the internal structure of the tail lamp which concerns on the 4th Embodiment of this invention. The front view of a light guide. The rear view of a light guide. Sectional drawing which shows the internal structure of the tail lamp which concerns on the 5th Embodiment of this invention. The front view of a light guide. The rear view of a light guide. Sectional drawing which shows the internal structure of the tail lamp which concerns on the 6th Embodiment of this invention. The front view of a light guide.

Explanation of symbols

1,14,19,23,36,42 Tail lamp (vehicle lamp)
3, 15, 20, 24, 37, 43 Light guide 4 LED (light source)
6, 25, 41 Bottom wall portion 7, 26 First tube portion 8, 18, 30, 39, 46 First exit surface 9, 31, 40 First reflection surface 10, 22, 28 Second exit surface 11, 32 1st entrance surface 12, 33 2nd entrance surface 13, 34 2nd reflection surface 17, 45 Cover member 27 2nd cylinder part 29 3rd output surface 35 3rd reflection surface 38 3rd Tube part K optical axis L1, L2 light

Claims (6)

A bottom wall portion on which the light source is arranged on the back side;
A first cylinder portion erected on a peripheral edge portion of the front surface of the bottom wall portion;
A first incident surface that is formed on the back surface of the bottom wall portion and on which a part of the light emitted from the light source is incident;
A second incident surface that is formed around the first incident surface on the rear surface of the bottom wall portion and on which a part of the light emitted from the light source is incident;
A first exit surface that is disposed on an optical axis that passes through the light source and the first entrance surface and is substantially parallel to a central axis of the first cylindrical portion, and from which light incident on the first entrance surface exits; ,
A second emission surface formed on the top surface of the first cylindrical portion and emitting light;
A first reflecting surface that reflects light incident on the second incident surface in a direction away from the optical axis;
A second reflecting surface that reflects light reflected by the first reflecting surface toward the second emitting surface;
A light guide comprising: The first emission surface is formed on the front surface of the bottom wall portion and is located on the central axis of the first cylinder portion,
2. The light guide according to claim 1, wherein the second emission surface is formed in an annular shape over the entire circumference of the top surface of the first cylindrical portion. A cover member disposed inside the first tube portion at a position spaced from the bottom wall portion and covering the bottom wall portion;
The light guide according to claim 1, wherein the first emission surface is formed on the cover member. A second tube portion standing on the front surface of the bottom wall portion and positioned inside the first tube portion and parallel to the first tube portion;
A third emission surface that is formed in an annular shape over the entire circumference of the top surface of the second cylindrical portion, and emits light;
A third reflecting surface that reflects light reflected by the first reflecting surface toward the third emitting surface;
With
The first emission surface is located along the circumferential direction of the first tube portion in a state of being positioned between the first tube portion and the second tube portion in the radial direction of the first tube portion. Multiple,
4. The light guide according to claim 1, wherein the second emission surface is formed in an annular shape over the entire circumference of the top surface of the first cylindrical portion. 5. A second tube portion standing on the front surface of the bottom wall portion and positioned inside the first tube portion and parallel to the first tube portion;
A third emission surface formed in an annular shape over the entire circumference of the top surface of the second cylindrical portion, and from which light is emitted;
A third reflecting surface that reflects light reflected by the first reflecting surface toward the third emitting surface;
A third cylinder portion standing on the front surface of the bottom wall portion and positioned between the first cylinder portion and the second cylinder portion and parallel to the first cylinder portion;
With
A plurality of the first emission surfaces are formed along the circumferential direction of the third cylindrical portion on the top surface of the third cylindrical portion,
2. The light guide according to claim 1, wherein the second emission surface is formed in an annular shape over the entire circumference of the top surface of the first cylindrical portion. A light source;
A light guide that emits light incident from the light source;
In a vehicle lamp comprising:
The light guide is
A bottom wall portion on which the light source is disposed on the back side;
A first cylinder portion erected on a peripheral edge portion of the front surface of the bottom wall portion;
A first incident surface that is formed on the back surface of the bottom wall portion and on which a part of the light emitted from the light source is incident;
A second incident surface that is formed around the first incident surface on the rear surface of the bottom wall portion and on which a part of the light emitted from the light source is incident;
A first exit surface that is disposed on an optical axis that passes through the light source and the first entrance surface and is substantially parallel to a central axis of the first cylindrical portion, and from which light incident on the first entrance surface exits; ,
An annular second emission surface that is formed on the top surface of the first cylindrical portion and emits light;
A first reflecting surface that reflects light incident on the second incident surface in a direction away from the optical axis;
A second reflecting surface that reflects light reflected by the first reflecting surface toward the second emitting surface;
With
A plurality of the light guides are provided,
A vehicular lamp characterized in that a part of the second emission surfaces of the light guides adjacent to each other are overlapped in the optical axis direction.

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