JP2017092010A - Light guide body and vehicular lighting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide body enabling three-dimensional feeling to be performed by light emission of a light emission surface, without increase in the number of light sources and enlarging its size.SOLUTION: A light guide body 6A is configured to guide light from a light source to emit light on a light emission surface 67 provided on one surface, and includes: a light guide emission surface 64 configured to emit partial light L (L2) out of light from the light source toward one direction; a light guide incident surface 65 into which the light L (L2) emitted from the light guide emission surface 64 is made incident; and light guide reflection surfaces 63, 66 configured to reflect the other light L (L1) out of the light from the light source or the light L (L2) made incident from the light guide incident surface 65 toward the light emission surface 67 side. The light guide reflection surfaces 63, 66 are juxtaposed at different heights in the one direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a light guide and a vehicle lamp, and more particularly, to a light guide used in combination with a light source, and a vehicle lamp including these.

  Conventionally, a vehicular lamp in which a light source and a light guide are combined has been proposed (see, for example, Patent Documents 1 and 2). In a vehicle lamp, while light from a light source is guided by a columnar or plate-shaped light guide, the light is internally reflected (total reflection) by a plurality of reflecting surfaces provided on the light guide, While diffusing the light reflected by each reflecting surface, the light emitting surface provided on one surface (front surface) of the light guide is caused to emit light substantially uniformly (surface light emission). Such a vehicular lamp is used, for example, for a tail lamp of a vehicle.

JP2013-016460A JP 2006-313681 A

  By the way, in the vehicular lamp described in Patent Document 1, when the light emitting surface of the light guide is a flat surface, the light emitting surface is a flat surface. Can not. Therefore, in this case, it is difficult to produce a stereoscopic effect by light emission from the light emitting surface.

  On the other hand, when the light emitting surface of the light guide is curved, the optical axis of the light guided in the light guide is in one direction, so the direction of this optical axis is bent according to the curvature of the light emitting surface. It is not possible. For this reason, depending on the direction of the optical axis, a part of the light reflected by the reflecting surface may not reach the light emitting surface, causing uneven light emission on the light emitting surface. Also in this case, since the light emitting surface is a flat surface, it is difficult to produce a stereoscopic effect by light emission from the light emitting surface.

  Further, in the vehicular lamp described in Patent Document 2, a stereoscopic effect is produced by light emission from the light emitting surface by using a stepped light guide having a convex center part (FIG. 7). See). However, if the shape of the light guide is convex (or concave) in such a front view, a plurality of light sources are arranged at both ends of the light guide (upper and lower ends in Patent Document 2), and then the light Must be incident on the light guide. For this reason, problems such as an increase in cost due to an increase in the number of light sources and an increase in size due to securing a space for arranging a plurality of light sources occur.

  The present invention has been proposed in view of such conventional circumstances, and a light guide that can produce a three-dimensional effect by light emission from the light emitting surface while avoiding an increase in the number of light sources and an increase in size, and such a light guide. It aims at providing the vehicular lamp provided with the light guide.

  In order to achieve the above object, the invention described in claim 1 is a light guide that guides light from a light source to emit light from a light emitting surface provided on one surface, and one of the lights from the light source. A light guide exit surface that emits the light in one direction, a light guide entrance surface on which light emitted from the light guide exit surface enters, and the other light of the light from the light source or the light guide A light guide reflecting surface that reflects light incident from the incident surface toward the light emitting surface, and the light guide reflecting surfaces are arranged at different heights in the one direction. It is a light guide.

  In the first aspect of the present invention, the light from the light source is reflected by the light guide reflecting surface having a different height and directed toward the light emitting surface, and is emitted from the light guide emitting surface and incident on the light guiding incident surface. After that, the light emitted from the light emitting surface can be viewed three-dimensionally by the light reflected by the light guide reflecting surfaces having different heights and directed toward the light emitting surface.

  The invention according to claim 2 is the light guide according to claim 1, wherein the light guide exit surface, the light guide entrance surface, and the light guide reflection surface are on the side facing the light emitting surface. It is comprised by the some level | step-difference part located in a line with the said 1 direction.

  In invention of Claim 2, according to the shape of a several level | step-difference part, the light emission of a light emission surface can be visually recognized in three dimensions.

  The invention according to claim 3 is the light guide according to claim 2, wherein the plurality of stepped portions have a plurality of stepped surfaces parallel to the one direction, and Between each of the plurality of step surfaces having a concave structure in which the height of the step surface increases in order toward both ends in the direction in which the step portions are arranged, and the height of the step surface decreases in order in the one direction. The light guide reflection surface inclined with respect to the one direction and the light guide emission surface orthogonal to the one direction are arranged, and the height of the step surface toward the one direction Between each of the plurality of stepped surfaces that become higher in order, the light guide incident surface orthogonal to the one direction and the light guide reflecting surface inclined with respect to the one direction. It is characterized by.

  According to the third aspect of the present invention, the light emission from the light emitting surface can be visually recognized in a convex shape according to the concave structure formed by the plurality of step portions.

  The invention according to claim 4 is the light guide according to claim 2, wherein the plurality of stepped portions have a plurality of step surfaces parallel to the one direction, and It has a convex structure in which the height of the step surface gradually decreases toward both ends in the direction in which the step portions are arranged, and the step surface is higher than the plurality of step surfaces in which the height of the step surface is sequentially increased toward the one direction. A plurality of step surfaces, which are located on the near side in one direction, are arranged with the light guide exit surface orthogonal to the one direction, and the height of the step surface increases in order toward the one direction. The light guide entrance surface orthogonal to the one direction and the light guide reflection surface inclined with respect to the one direction are disposed between each of the first step direction and the height of the step surface toward the one direction. The light guide reflection surface that is inclined with respect to the one direction is disposed between each of the plurality of step surfaces that become lower in order. It is characterized in that is.

  According to the fourth aspect of the present invention, the light emission from the light emitting surface can be visually recognized in a concave shape in accordance with the concave structure constituted by a plurality of step portions.

  Moreover, the invention according to claim 5 is the light guide according to any one of claims 1 to 4, wherein the light guide reflection surface is formed in a line shape and is arranged in a plurality in the one direction. It is characterized by being arranged by.

  According to the fifth aspect of the present invention, the plurality of light emission lines displayed on the light emitting surface can be viewed in three dimensions.

  The invention according to claim 6 is the light guide according to any one of claims 1 to 5, wherein the light emitting surface is a flat surface.

  In the invention according to claim 6, even if the light emitting surface is a flat surface, the light emitted from the light emitting surface can be viewed in three dimensions.

  The invention according to claim 7 is provided with a light source and a light guide that guides light from the light source to emit light from a light emitting surface provided on one surface. It is a light guide as described in any one of -6, It is a vehicle lamp characterized by the above-mentioned.

  In the invention according to claim 7, it is possible to produce a three-dimensional effect by light emission of the light emitting surface of the light guide that is viewed in three dimensions while avoiding an increase in the number of light sources and an increase in size.

  The invention according to claim 8 is the vehicular lamp according to claim 7, wherein the light guide is located on a side opposite to the side facing the light emitting surface and opposite to the light emitting surface. A reflector that reflects the light emitted from the light-emitting surface toward the light-emitting surface.

  In the invention according to claim 8, since the reflector reflects the light emitted from the side opposite to the light emitting surface toward the light emitting surface, the luminance due to the light emission of the light emitting surface can be increased.

  The invention according to claim 9 is the vehicular lamp according to claim 8, wherein the light is positioned on the side of the light guide opposite to the light emitting surface and is one of the light emitted from the light emitting surface. And an inner lens provided with a plurality of transflective surfaces that transmit part of the light and reflect some of the light.

  According to the ninth aspect of the present invention, a depth sensation is caused by a luminance difference between relatively weak light transmitted through each semi-transmissive reflective surface of the inner lens and relatively strong light transmitted between each semi-transmissive reflective surface. It is possible to produce.

  As described above, according to the present invention, a light guide capable of producing a three-dimensional effect by light emission from a light emitting surface while avoiding an increase in the number of light sources and an increase in size, and a vehicle lamp including such a light guide. Can be provided.

It is a front view showing the appearance of the rear combination lamp using the vehicular lamp according to the first embodiment of the present invention. It is a disassembled perspective view which shows the structure of the vehicle lamp shown in FIG. It is sectional drawing by line segment BB of the vehicle lamp shown in FIG. It is a figure for demonstrating the structure of the 1st inner lens with which the vehicle lamp shown in FIG. 3 is equipped, (a) is the front view, (b) is the CC sectional drawing, (c) is the D- D sectional drawing and (d) are the E expanded sectional views. It is a figure for demonstrating the structure of the 2nd inner lens with which the vehicle lamp shown in FIG. 3 is equipped, (a) is the front view, (b) is the FF sectional drawing, (c) is the G expansion. It is sectional drawing. It is a perspective view which shows the light source image when light-emitting a some light emission line in the light emission surface of the 2nd inner lens with which the vehicle lamp shown in FIG. 3 is equipped. It is sectional drawing which shows the structure of the vehicle lamp which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the light source image when a some light emission line is light-emitted in the light emission surface of the 2nd inner lens with which the vehicle lamp shown in FIG. 7 is equipped. It is sectional drawing which expands and shows the principal part of the 3rd inner lens to which the half mirror process with which the vehicle lamp shown in FIG. 3 or FIG. 7 is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easy to see, the scales of the dimensions may be different depending on the component, and the dimensional ratio of each component is not always the same as the actual. Absent.

(First embodiment)
First, a vehicle lamp 1A shown in FIGS. 1, 2, and 3 will be described as a first embodiment of the present invention. FIG. 1 is a front view showing an appearance of a rear combination lamp using the vehicular lamp 1A. FIG. 2 is an exploded perspective view showing the configuration of the vehicular lamp 1A shown in FIG. FIG. 3 is a cross-sectional view taken along line BB of the vehicular lamp 1A shown in FIG.

  As shown in FIG. 1, the vehicular lamp 1 </ b> A is a tail lamp that is mounted on both ends of the rear portion of the vehicle (not shown) (in this example, the right end), and is mounted on the back gate (or trunk lid) of the vehicle. Together with the lid lamp 100, a rear combination lamp is configured. Further, the vehicular lamp (tail lamp) 1A and the lid lamp 100 are integrally designed as a rear combination lamp by being juxtaposed in the vehicle width direction.

  In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to when the vehicle lamp 1A is viewed from the front (rear side of the vehicle) unless otherwise specified. Means the respective directions. Therefore, each direction when the vehicle is viewed from the front (front of the vehicle) is a direction in which front, rear, left and right are reversed.

  As shown in FIGS. 2 and 3, the vehicular lamp 1 </ b> A includes a housing 2 whose front surface is open and a transparent outer lens 3 that covers the opening of the housing 2. Is configured.

  The vehicular lamp 1A includes an LED unit 4, a first inner lens 5, a second inner lens 6A, a reflector 7, a third inner lens 8, and an extension 9, which are inside the lamp chamber. Is housed in.

  The LED unit 4 is a socket with a coupler called DICS (Direct Coupler Socket), and includes a light emitting diode (LED) 41 serving as a light source and a socket body 42 to which the LED 41 is mounted. The LED unit 4 is detachably accommodated from a hole (not shown) provided on the rear surface side of the housing 2 to the inside of the lamp chamber. The LED unit 4 emits light emitted from the LEDs 41 radially toward the front (rear of the vehicle).

  The first inner lens 5 is a columnar light guide, and is disposed in front of the LED unit 4 to guide the light emitted from the LED unit 4 inside, and forward the light diffused in the left-right direction to the front. It has a function of emitting light toward the rear of the vehicle.

  Specifically, the first inner lens 5 has a configuration as shown in FIGS. FIG. 4A is a front view of the first inner lens 5. FIG. 4B is a cross-sectional view taken along line C-C shown in FIG. FIG. 4C is a cross-sectional view taken along the line DD shown in FIG. FIG. 4D is an enlarged cross-sectional view of the encircled portion E in FIG.

  As shown in FIG. 2 and FIGS. 4A to 4D, the first inner lens 5 is made of a long columnar translucent base material extending in the left-right direction. The first inner lens 5 has an incident portion 51, a first reflecting surface 52, a second reflecting surface 53, a third reflecting surface 54, and an exit surface 55.

  As shown in FIG. 4B, the incident portion 51 is provided so as to protrude rearward (front of the vehicle) from an intermediate portion of the surface (rear surface) facing the LED unit 4 of the first inner lens 5. The incident portion 51 is located at a position facing the LED 41 of the LED unit 4 and has a rotationally symmetric shape with the optical axis Ax of the light L emitted from the LED 41 as the symmetry axis.

  Specifically, the incident portion 51 includes a first condensing incident surface 511, a second condensing incident surface 512, and a condensing reflection surface 513. Among these, the 1st condensing entrance surface 511 is comprised by the free-form surface (aspherical surface) which becomes convex toward the back from the center part. On the other hand, the second condensing incident surface 512 is configured by a substantially cylindrical inner peripheral surface of a portion protruding rearward from a position surrounding the periphery of the first incident surface 511. On the other hand, the condensing / reflecting surface 513 is configured by a substantially frustoconical outer peripheral surface of a portion protruding rearward from a position surrounding the first incident surface 511. Further, the first condensing incident surface 511 is arranged so that the LED 41 is positioned in the vicinity of the focal point.

  In the incident part 51, the light L incident from the first condensing incident surface 511 out of the light L emitted from the LED unit 4 is collected closer to the optical axis Ax toward the first reflecting surface 52 in the front (rear side of the vehicle). Light up. On the other hand, after the light L incident from the second condensing incident surface 512 is internally reflected (totally reflected) by the first reflecting surface 52, it is closer to the optical axis Ax toward the first reflecting surface 52 in the front (rear of the vehicle). Collect light.

  As shown in FIG. 4B, the first reflecting surface 52 is V-shaped by vertically cutting an intermediate portion of the surface (front surface) opposite to the side facing the LED unit 4 of the first inner lens 5. It is comprised by the shape-shaped groove part. That is, the first reflecting surface 52 is located at a position facing the incident portion 51, and is composed of a pair of inclined surfaces inclined in opposite directions with respect to the optical axis Ax as an axis of symmetry.

  The first reflecting surface 52 internally reflects (totally reflects) the light L incident on the inside of the first inner lens 5 from the incident portion 51 toward the second reflecting surface 53 so as to branch to the left and right sides.

  As shown in FIG. 4 (c), the second reflecting surface 53 is composed of left and right lower ends sandwiching the first reflecting surface 52 of the first inner lens 5. Specifically, as shown in an enlarged view in FIG. 4 (d), the second reflecting surface 53 extends in the left-right direction at the left and right lower ends sandwiching the first reflecting surface 52 of the first inner lens 5, respectively. It is comprised by the several level | step-difference part lined up. These step portions have a plurality of step surfaces 532 that are parallel to the traveling direction of the light L reflected by the first reflecting surface 52, and steps toward the left and right ends of the first inner lens 5. The surface 532 has a shape in which the height increases in order. The second reflecting surface 53 includes a plurality of inclined surfaces 531 that are positioned between the plurality of step surfaces 532 and are inclined in the same direction.

  In the second reflecting surface 53, after being reflected by the first reflecting surface 52, the light L traveling toward the left and right sides of the first inner lens 5 is internally reflected from each inclined surface 531 toward the upper second reflecting surface 53 ( Total reflection).

  As shown in FIG. 3, the third reflecting surface 54 is configured by an inclined surface provided at the upper end portion of the first inner lens 5. Specifically, the third reflecting surface 54 is configured by an inclined surface that is located above the first reflecting surface 52 and is inclined at about 45 ° toward the front. The third reflecting surface 54 is formed to extend in the left-right direction of the first inner lens 5.

  In the third reflection surface 54, after being reflected by the second reflection surface 53, the light L traveling upward of the first inner lens 5 is internally reflected (totally reflected) toward the front (rear side of the vehicle) emission surface 55.

  As shown in FIGS. 3 and 4A, the emission surface 55 is located on the front surface of a portion protruding forward (vehicle rearward) from the upper end portion of the first inner lens 5 and is substantially perpendicular to the front-rear direction. It is constituted by a flat surface. Further, the emission surface 55 is located at a position facing the third reflection surface 54 and is formed to extend in the left-right direction.

  At the emission surface 55, the light L reflected by the third reflection surface 54 is emitted to the outside of the first inner lens 5. Thereby, in the 1st inner lens 5, it is possible to radiate | emit the light diffused in the left-right direction toward the 2nd inner lens 6A ahead (vehicle back) from the output surface 55. FIG.

  The second inner lens 6A is a plate-like light guide to which the present invention is applied. The second inner lens 6A is disposed in front of the first inner lens 5 and is diffused in the left-right direction from the first inner lens 5 (emission surface 55). The light emitted in this way is guided inside, and further, the light diffused in the vertical direction is emitted toward the front (rear of the vehicle).

  Specifically, the second inner lens 6A has a configuration as shown in FIGS. FIG. 5A is a front view of the second inner lens 6A. FIG. 5B is a cross-sectional view taken along line FF shown in FIG. FIG.5 (c) is sectional drawing to which the enclosure part G in FIG.5 (b) was expanded.

  As shown in FIGS. 2, 3, and 5 (a), the second inner lens 6 </ b> A is made of a light-transmitting base material having a substantially rectangular flat plate shape. The second inner lens 6A includes a first light guide incident surface 61, a first light guide reflective surface 62, a second light guide reflective surface 63, a first light guide exit surface 64, and a second light guide incident surface 65. And a third light guide reflecting surface 66 and a second light guide emitting surface 67.

  Among these, the 1st light guide exit surface 64 respond | corresponds to the "light guide exit surface" of the light guide to which this invention is applied. On the other hand, the second light guide incident surface 65 corresponds to a “light guide incident surface” of the light guide to which the present invention is applied. On the other hand, the 2nd light guide reflective surface 63 and the 3rd light guide reflective surface 66 respond | correspond to the "light guide reflective surface" of the light guide to which this invention is applied. On the other hand, the second light guide exit surface 67 corresponds to the “light emitting surface” of the light guide to which the present invention is applied.

  The first light guide incident surface 61 is located on the rear surface of a portion protruding rearward (front of the vehicle) from the upper end portion of the second inner lens 6A, and is configured by a plane substantially perpendicular to the front-rear direction. The first light guide incident surface 61 is located at a position facing the emission surface 55 of the first inner lens 5, and is formed to extend in the left-right direction according to the shape of the emission surface 55.

  In the first light guide incident surface 61, the light L emitted from the emission surface 55 of the first inner lens 5 is incident on the inside of the second inner lens 6A. That is, the light L emitted from the emission surface 55 of the first inner lens 5 is incident from the first light guide incident surface 61 toward the first light guide reflection surface 62 on the front side (rear side of the vehicle).

  The first light guide reflection surface 62 is located on the front surface of the upper end portion of the second inner lens 6A, and is composed of an inclined surface inclined downward by about 45 °. The first light guide reflection surface 62 is located at a position facing the first light guide incident surface 61 and is formed to extend in the left-right direction of the second inner lens 6A.

  In the first light guide reflection surface 62, after entering from the first light guide incident surface 61, the light L traveling forward (rear of the vehicle) of the second inner lens 6A toward the lower side of the second inner lens 6A is internally reflected ( Total reflection).

  Further, as shown in FIG. 2 and FIGS. 5A and 5B, the light L reflected by the first light guide reflection surface 62 is substantially evenly distributed in the left-right direction on the first light guide reflection surface 62. A plurality of lens cuts 62a for diffusing are provided.

  The plurality of lens cuts 62a are configured by a substantially serrated groove portion that cuts out the first light guide reflection surface 62 in the vertical direction and arranged in the horizontal direction. The plurality of lens cuts 62a emit light substantially uniformly on a light emitting surface (second light guide emitting surface 67) of a second inner lens 6A, which will be described later, so as to match the shape of the second inner lens 6A. The horizontal diffusion of the light L reflected by the surface 62 is controlled. In addition, the light emitting surface (second light guide emitting surface 67) of the second inner lens 6A in the present embodiment is a convex surface that becomes wider as it goes downward and is curved in the left-right direction.

  Specifically, as shown in an enlarged view in FIG. 5C, the cut pitch P, the cut angle α, and the cut curvature R of each lens cut 62a are set to the light emitting surface (second light guide emitting surface) of the second inner lens 6A. 67). In FIG. 5C, the reflection direction of the light L reflected by the first light guide reflection surface 62 is schematically indicated by a solid arrow, and the diffusion direction of the light L is schematically indicated by a broken arrow. Yes.

  Among these, the cut pitch P is set in consideration of the appearance of the light emitting surface (second light guide emitting surface 67) by light emission, the manufacturability of the second inner lens 6A, and the like. For example, when the cut pitch P is reduced, the appearance of the light emitting surface (second light guide light emitting surface 67) is improved, but the number of man-hours increases due to an increase in processing difficulty and the surface accuracy decreases due to difficulty in polishing. As a result, mold workability is deteriorated. On the other hand, when the cut pitch P is increased, the cut height increases and the moldability deteriorates. Therefore, the cut pitch P is set to a good value in consideration of these balances.

  On the other hand, for the cut angle α, the number of cut pitches P, the angle of the curved convex surface of the light emitting surface (second light guide outgoing surface 67), and the light emitting surface (second light guide outgoing surface 67) described later. The optimum value is set by calculating backward from the direction of the reflected light L.

  On the other hand, the cut curvature R is set so that the cut surface (surface that reflects light) having the cut angle α set to the optimum value described above is curved corresponding to the desired diffusion direction.

  In the first light guide reflection surface 62, by setting the cut pitch P, the cut angle α, and the cut curvature R of the lens cuts 62a described above to optimum values, as shown in FIG. In accordance with the shape of the lens 6A, the reflection directions of the light L reflected by the lens cuts 62a are different from each other.

  Thereby, the distribution of the light L reflected from the first light guide reflection surface 62 toward the lower side of the second inner lens 6A can be made substantially equal in the left-right direction. As a result, it is possible to prevent light emission unevenness from occurring on the light emitting surface (second light guide emitting surface 67) of the second inner lens 6A.

  As shown in FIG. 3, the second light guide reflection surface 63, the first light guide exit surface 64, the second light guide incident surface 65, and the third light guide reflection surface 66 are located on the rear surface of the second inner lens 6A. Thus, it is configured by a plurality of step portions 68A arranged in the traveling direction of light L reflected by the first light guide reflecting surface 62 (corresponding to “one direction” of the light guide to which the present invention is applied). .

  The plurality of step portions 68A have a plurality of step surfaces 69 that are parallel to the traveling direction of the light L reflected by the first light guide reflection surface 62. The plurality of stepped portions 68A have a concave structure in which the height of the stepped surface 69 increases in order toward both ends (upper and lower ends) of the direction in which the plurality of stepped portions 68A are arranged (vertical direction). Specifically, in this concave structure, the height of the stepped surface 69 increases in order from the substantially central portion in the vertical direction of the second inner lens 6A toward the upper and lower ends. Each step surface 69 is formed in a line shape in the left-right direction of the second inner lens 6A.

  Between each of the plurality of step surfaces 69 in which the height of the step surface 69 decreases in order from the upper end of the second inner lens 6 </ b> A toward the approximate center, the second light guide reflection surface 63 and the first light guide exit surface 64 are provided. Is arranged.

  The second light guide reflection surface 63 is located between the higher level (upper) side step surface 69 and the first light guide exit surface 64, and the traveling direction of the light L reflected by the first light guide reflection surface 62 Are formed by inclined surfaces that are inclined at substantially 45 ° in the same direction. The second light guide reflection surface 63 is formed to extend in a line shape in the left-right direction of the second inner lens 6A.

  In the second light guide reflection surface 63, the light (corresponding to “the other light” of the present invention) L reflected by the first light guide reflection surface 62 is forward (rear vehicle rear) second light guide emission surface 67. Internal reflection (total reflection) toward (In FIG. 3, the light L reflected by the second light guide reflection surface 63 is represented by a solid line L1.)

  The first light guide exit surface 64 is located between the second light guide reflection surface 63 and the lower (lower) step surface 69, and the traveling direction of the light L reflected by the first light guide reflection surface 62 It is comprised by the plane orthogonal to. Further, the first light guide exit surface 64 is formed to extend in a line shape in the left-right direction of the second inner lens 6A.

  The first light guide exit surface 64 emits light L (corresponding to “one light” of the present invention) reflected by the first light guide reflector 62 to the outside of the second inner lens 6A. That is, the light L reflected by the first light guide reflection surface 62 is emitted downward from the first light guide emission surface 64.

  On the other hand, between each of the plurality of step surfaces 69 in which the height of the step surface 69 increases in order from the approximate center of the second inner lens 6A toward the lower end, the second light guide incident surface 65 and the third light guide reflection surface are provided. 66 is arranged.

  The second light guide incident surface 65 is located between the third light guide reflection surface 66 and the lower (lower) step surface 69, and the traveling direction of the light L reflected by the first light guide reflection surface 62 It is comprised by the plane orthogonal to. The second light guide incident surface 65 protrudes rearward (front of the vehicle) from the step surface 69 on the higher (upper) side. Further, the second light guide incident surface 65 is formed to extend in a line shape in the left-right direction of the second inner lens 6A.

  At the second light guide entrance surface 65, the light L emitted from the first light guide exit surface 64 enters the second inner lens 6A. That is, the light L emitted from the first light guide exit surface 64 is incident downward from the second light guide entrance surface 65.

  The third light guide reflection surface 66 is located between the step surface 69 on the higher (upper) side and the second light guide incident surface 65, and the traveling direction of the light L reflected by the first light guide reflection surface 62 Are inclined by substantially 45 ° in the same direction and in the same direction as the second light guide reflection surface 63. Further, the third light guide reflection surface 66 is formed to extend in a line shape in the left-right direction of the second inner lens 6A.

  In the third light guide reflection surface 66, the light L incident from the second light guide incident surface 65 is internally reflected (totally reflected) toward the second light guide emission surface 67 in the front (rear side of the vehicle). (In FIG. 3, the light L reflected by the third light guide reflection surface 66 is represented by a broken line L2.)

  The second light guide emission surface 67 is located on the front surface of the second inner lens 6A, and is configured by a flat surface that is substantially perpendicular to the front-rear direction. On the other hand, as shown in FIG. 2 and FIG. 5A, the second light guide emitting surface 67 is a convex surface that becomes wider as it goes downward and is curved in the left-right direction.

  At the second light guide exit surface 67, the lights L1 and L2 reflected by the second light guide reflector 63 and the third light guide reflector 66 are emitted to the outside of the second inner lens 6A. In addition, a plurality of line-shaped second light guide reflection surfaces 63 and third light guide reflection surfaces 66 are arranged side by side in the vertical direction, so that the second light guide emission surface 67 has a plurality of light emission arranged in the vertical direction. A line will be displayed.

  Thereby, in the 2nd inner lens 6A, it is possible to radiate | emit the light L1, L2 by a some light emission line toward the 3rd inner lens 8 of the front (vehicle rear).

  The reflector 7 is located on the rear surface side of the second inner lens 6A, and is disposed so that the reflection surface thereof faces the plurality of step portions 68A. The reflector 7 reflects the light L3 emitted backward from the rear surface of the second inner lens 6A toward the front. Thereby, in the vehicle lamp 1A of the present embodiment, the lights L1 and L2 emitted from the front surface (second light guide emission surface 67) side of the second inner lens 6A are increased, and the light L1 generated by the plurality of light emission lines described above. , L2 can be increased in luminance.

  In the vehicle lamp 1 </ b> A of the present embodiment, the light L from the LED unit 4 is guided from the first inner lens 5 on the rear side of the reflector 7 to the second inner lens 6 </ b> A on the front side of the reflector 7. Therefore, the LED 41 of the LED unit 4 is structured not to be seen directly from the front of the vehicle lamp 1A. Thereby, it is possible to prevent a so-called spotlight in which a portion corresponding to the LED 41 of the LED unit 4 shines stronger than other portions is visually recognized.

  As shown in FIG. 3, the third inner lens 8 is made of a parallel plate-shaped translucent base material and is disposed in front of the second inner lens 6A. As a so-called plain lens, the third inner lens 8 passes (transmits) light L1 and L2 from the light emission line emitted from the second inner lens 6A as it is.

  The extension 9 is a so-called blindfolding decorative plate, and is made of a light shielding member that covers the periphery of the third inner lens 8. Thereby, the extension 9 exposes only the light emitting surface (second light guide emitting surface 67) of the second inner lens 6A forward (rear of the vehicle) through the third inner lens 8.

  In the vehicular lamp 1 </ b> A having the above-described configuration, the lights L <b> 1 and L <b> 2 from the plurality of light emitting lines described above can be viewed in three dimensions. Here, FIG. 6 shows a light source image of the vehicular lamp 1A when a plurality of light emitting lines are caused to emit light on the light emitting surface (second light guide emitting surface 67) of the second inner lens 6A. In FIG. 6, a plurality of light emission lines are denoted as BL.

  The plurality of light emitting lines BL shown in FIG. 6 has a difference in height (height difference) between the second light guide reflection surface 63 and the third light guide reflection surface 66 having a concave structure constituted by the plurality of step portions 68A described above. Reflecting the above, light is emitted in a convex shape as a whole so that the height of the light emitting line BL decreases in order from the substantially vertical center to the upper and lower ends.

  Thereby, in 1 A of vehicle lamps of this embodiment, the some light emission line BL can be visually recognized in three dimensions. Therefore, in this vehicular lamp 1A, while avoiding an increase in the number of light sources and an increase in size, even if the light emitting surface (second light guide emitting surface 67) of the second inner lens 6A is a flat surface, the plurality of light emission components. A stereoscopic effect can be produced by the line BL.

(Second Embodiment)
Next, a vehicle lamp 1B shown in FIG. 7 will be described as a second embodiment.
FIG. 7 is a cross-sectional view showing the configuration of the vehicular lamp 1B. FIG. 7 corresponds to a cross-sectional view taken along line BB shown in FIG.

  As shown in FIG. 7, the vehicular lamp 1B includes a second inner lens 6B, which is a light guide to which the present invention is applied, instead of the second inner lens 6A included in the vehicular lamp 1A. The rest of the configuration is basically the same as that of the vehicle lamp 1A. Therefore, in the following description, portions equivalent to the vehicular lamp 1A are not described and are denoted by the same reference numerals in the drawings.

  As with the second inner lens 6A, the second inner lens 6B shown in FIG. 7 includes a first light guide incident surface 61, a first light guide reflection surface 62, a second light guide reflection surface 63, and a first light guide reflection surface 63. It has a light guide exit surface 64, a second light guide entrance surface 65, a third light guide reflection surface 66, and a second light guide exit surface 67. On the other hand, the arrangement of the second light guide reflection surface 63, the first light guide exit surface 64, the second light guide incident surface 65, and the third light guide reflection surface 66 is different from that of the second inner lens 6A.

  Specifically, in the second inner lens 6B, the second light guide reflection surface 63, the first light guide exit surface 64, the second light guide entrance surface 65, and the third light guide reflection surface 66 are formed of the second inner lens 6B. The plurality of step portions 68B are arranged on the rear surface and arranged in the traveling direction (one direction) of the light L reflected by the first light guide reflection surface 62.

  The plurality of step portions 68B have a plurality of step surfaces 69 that are parallel to the traveling direction of the light L reflected by the first light guide reflection surface 62. The plurality of stepped portions 68B have a convex structure in which the height of the stepped surface 69 decreases in order toward both ends in the direction (vertical direction) in which the plurality of stepped portions 68B are arranged. Specifically, in this convex structure, the height of the stepped surface 69 decreases in order from the substantially central portion in the vertical direction of the second inner lens 6B toward the upper and lower ends. Each step surface 69 is formed in a line shape in the left-right direction of the second inner lens 6B.

  Between each of the plurality of step surfaces 69 in which the height of the step surface 69 increases in order from the upper end of the second inner lens 6B toward the substantially center, the second light guide incident surface 65 and the third light guide reflection surface 66 are provided. Has been placed.

  On the other hand, a second light guide reflection surface 63 is disposed between each of the plurality of step surfaces 69 in which the height of the step surface 69 decreases in order from the approximate center to the lower end of the second inner lens 6B.

  Further, the first light guide exit surface 64 is located on the lower surface of the portion protruding rearward (front of the vehicle) from the upper end of the second inner lens 6B, and the light L reflected by the first light guide reflection surface 62 is reflected. It is comprised by the plane orthogonal to the advancing direction. In other words, the first light guide emitting surface 64 is located at a position facing the first light guide reflecting surface 62, and is located further above the uppermost step surface 69a so as to extend in the left-right direction. Has been.

  Here, the uppermost step surface 69 a is exceptionally positioned higher (upper) than the adjacent step surface 69. For this reason, the 2nd light guide reflective surface 63a is arrange | positioned in the position adjacent to the level | step difference surface 69a located in the uppermost part. However, the second light guide reflection surface 63a is positioned lower (lower) than the adjacent third light guide reflection surface 66.

  Accordingly, the height of each of the second light guide reflection surfaces 63 and 63a and the third light guide reflection surface 66 of the convex structure constituted by the plurality of step portions 68B described above reflects the convex structure, and the second The inner lens 6B becomes lower in order from the substantially central portion in the vertical direction toward the upper and lower ends. The second inner lens 6B may have a configuration in which the step surface 69a and the second light guide reflection surface 63a described above are omitted.

  In addition, the second light guide reflection surface 63b located at the lowermost position is not the light L emitted from the first light guide emission surface 64 but the second light L that is exceptionally guided in the second inner lens 6B. Internal reflection (total reflection) is performed toward the light guide exit surface 67. That is, the light L1 reflected by the second light guide reflection surfaces 63, 63a, 63b is not limited to the light L emitted from the first light guide emission surface 64, but is the light L guided in the second inner lens 6B. There may be.

  In the vehicular lamp 1 </ b> B having the above-described configuration, the lights L <b> 1 and L <b> 2 from the plurality of light emitting lines described above can be viewed in three dimensions. Here, FIG. 8 shows a light source image of the vehicular lamp 1B when a plurality of light emitting lines are caused to emit light on the light emitting surface (second light guide emitting surface 67) of the second inner lens 6B. In FIG. 8, a plurality of light emitting lines are denoted as BL.

  The plurality of light-emitting lines BL shown in FIG. 8 has a height difference (high or low) between the second light guide reflection surfaces 63 and 63a and the third light guide reflection surface 66 having a convex structure constituted by the plurality of step portions 68B described above. Reflecting the difference, the light is emitted in a concave shape as a whole so that the height of the light emitting line BL increases in order from the approximate center in the vertical direction toward the upper and lower ends.

  Thereby, in the vehicular lamp 1B of the present embodiment, the plurality of light emission lines BL can be viewed in three dimensions. Therefore, in the vehicular lamp 1B, even if the light emitting surface (second light guide emitting surface 67) of the second inner lens 6B is a flat surface while avoiding an increase in the number of light sources and an increase in size, the plurality of light emission components. A stereoscopic effect can be produced by the line BL.

  In addition, this invention is not necessarily limited to the structure of vehicle lamp 1A, 1B shown to the said 1st and 2nd embodiment, A various change is added in the range which does not deviate from the meaning of this invention. Is possible.

  For example, in the vehicular lamps 1A and 1B, ones that have been subjected to a half mirror process, such as a third inner lens 8A shown in FIG. 9, may be used. FIG. 9 is an enlarged cross-sectional view showing a main part of the third inner lens 8A subjected to the half mirror process.

  Specifically, a plurality of transflective surfaces 81 are provided on the rear surface of the third inner lens 8A as shown in FIG. The transflective surface 81 is configured by forming a transflective film at a position facing the step surfaces 69 and 69a of the second inner lenses 6A and 6B.

  In the vehicle lamps 1A and 1B, when the third inner lens 8A is used, each semi-transmissive reflection surface 81 of the third inner lens 8A transmits part of the light L4 and reflects part of the light L5. Let Further, reflection is repeated between the reflector 7 and each transflective surface 81. As a result, a plurality of brightness differences between the relatively weak light L4 transmitted through each semi-transmissive reflective surface 81 of the third inner lens 8A and the relatively strong light L6 transmitted between each semi-transmissive reflective surface 81 can be obtained. It is possible to produce a sense of depth in the light emission line. Further, in the third inner lens 8A, it is possible to adjust the feeling of depth by changing the transmissivity of the transflective surface 81.

  The second inner lens 6A (6B) exemplifies the concave (convex) structure formed by the plurality of step portions 68A (68B) described above, but the light guide to which the present invention is applied is described above. Not only the concave (convex) structure, but also the shape, number, size, position, etc. of the light emission line that is viewed stereoscopically are changed as appropriate by changing the shape, number, size, height, etc. of the plurality of step portions. It is possible.

  In the second inner lens 6A (6B), a case where a plurality of light emitting lines BL arranged in the vertical direction is displayed on the light emitting surface (second light guide emitting surface 67) is illustrated. The applied light guide is not limited to such a light emitting line BL, but the shape, number, size, height, etc. of the light guide reflection surfaces (second light guide reflection surface 63 and third light guide reflection surface 66) are also determined. By changing, it is possible to appropriately change the shape, number, size, position, etc. of the portion displayed by the light emission of the light emitting surface.

  In addition, in the said vehicle lamp 1A, 1B, it is the structure which used LED41 as a light source, However, it is not restricted to such a light source, For example, light emitting elements, such as a laser diode (LD) and organic EL (OLED), It is also possible to use lamps such as halogen lamps and HID lamps that are generally used conventionally.

  Moreover, although the case where it applies to a tail lamp is illustrated in the said vehicle lamps 1A and 1B, in the case of a tail lamp, it is necessary to light the vehicle lamps 1A and 1B in red. In this case, the LED 41 of the LED unit 4 may be configured to emit red light. When the LED unit 4 emits white light, any one of the first inner lens 5, the second inner lens 6, the third inner lens 8, and the outer lens 3 may be configured to be transparent in red.

  Note that the vehicular lamp to which the present invention is applied is not limited to the tail lamp (tail lamp) described above. For example, a head lamp (head lamp), a vehicle width lamp (position lamp), an auxiliary head lamp (sub head lamp), Front (rear) fog lights (fog lamps), daytime lighting (day) lamps, lid lamps, brake lamps (stop lamps), back lamps, turn indicators (blinker lamps), etc. Any vehicle lamp may be used.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Vehicle lamp (tail lamp) 2 ... Housing 3 ... Outer lens 4 ... LED unit 5 ... 1st inner lens 6A, 6B ... 2nd inner lens (light guide) 7 ... Reflector 8, 8A ... 3rd inner Lens 9 ... Extension 41 ... LED (light source) 63, 63a, 63b ... Second light guide reflection surface (light guide reflection surface) 64 ... First light guide exit surface (light guide exit surface) 65 ... Second light guide entrance surface (Light guide incident surface) 66 ... third light guide reflective surface (light guide reflective surface) 67 ... second light guide exit surface (light emitting surface) 68A, 68B ... stepped portions 69, 69a ... stepped surface 81 ... transflective reflective surface BL ... Light emission line

Claims (9)

A light guide that guides light from a light source and emits a light emitting surface provided on one surface,
A light guide exit surface for emitting one of the lights from the light source in one direction; and
A light guide entrance surface on which light emitted from the light guide exit surface is incident;
A light guide reflecting surface that reflects the other light of the light from the light source or the light incident from the light guide incident surface toward the light emitting surface;
The light guide reflector, wherein the light guide reflection surfaces are arranged side by side at different heights in the one direction.   The light guide exit surface, the light guide entrance surface, and the light guide reflection surface are configured by a plurality of stepped portions arranged in the one direction on a side facing the light emitting surface. The light guide according to 1. The plurality of stepped portions have a plurality of stepped surfaces parallel to the one direction, and a concave structure in which the heights of the stepped surfaces increase in order toward both ends in the direction in which the stepped portions are arranged. Have
The light guide reflection surface that is inclined with respect to the one direction between each of the plurality of step surfaces in which the height of the step surface sequentially decreases toward the one direction, and orthogonal to the one direction. The light guide exit surface is arranged,
The light guide incident surface orthogonal to the one direction is inclined between the plurality of step surfaces in which the height of the step surface is increased in order toward the one direction, and inclined with respect to the one direction. The light guide body according to claim 2, wherein the light guide reflection surface is arranged. The plurality of stepped portions have a plurality of stepped surfaces that are parallel to the one direction, and the height of the stepped surfaces decreases in order toward both ends in the direction in which the stepped portions are arranged. Have
The light guide exit surface orthogonal to the one direction is positioned closer to the one direction than the plurality of step surfaces in which the height of the step surface is increased in order toward the one direction. Arranged,
The light guide incident surface orthogonal to the one direction is inclined between the plurality of step surfaces in which the height of the step surface increases in order toward the one direction, and the one direction is inclined. And a light guide reflection surface,
The light guide reflection surface that is inclined with respect to the one direction is disposed between each of the plurality of step surfaces in which the height of the step surface decreases in order toward the one direction. The light guide according to claim 2.   The light guide body according to any one of claims 1 to 4, wherein the light guide reflection surface is formed in a line shape, and a plurality of the light guide reflection surfaces are arranged side by side in the one direction.   The light guide according to claim 1, wherein the light emitting surface is a flat surface. A light source;
A light guide that guides light from the light source and emits a light emitting surface provided on one surface;
The said light guide is a light guide as described in any one of Claims 1-6, The vehicle lamp characterized by the above-mentioned.   The light guide is provided on a side opposite to the side facing the light emitting surface, and includes a reflector that reflects light emitted from the side opposite to the light emitting surface toward the light emitting surface. The vehicular lamp according to claim 7.   A plurality of semi-transparent reflecting surfaces are provided on the side facing the light emitting surface of the light guide so as to transmit a part of the light emitted from the light emitting surface and reflect a part of the light. The vehicular lamp according to claim 8, further comprising an inner lens.