JP5320176B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp configured to allow light emitted from a light source to enter a light guide column from one end surface thereof and to emit the light forward from the peripheral surface thereof.

  2. Description of the Related Art Conventionally, there has been known a lamp configured such that light emitted from a light source such as a light emitting diode is incident on one end surface of a light guide column and is emitted forward from the peripheral surface thereof.

  In that case, “Patent Document 1” describes a vehicular lamp in which the light source and the light guide column are arranged in a lamp chamber composed of a lamp body and a translucent cover.

  In such a lamp configuration, for example, as described in “Patent Document 2”, a plurality of notches extending in a direction orthogonal to the axial direction are provided in the axial direction in the rear surface portion of the peripheral surface of the light guide column. It is often formed in a sawtooth shape.

  At that time, in the lamp configuration described in “Patent Document 2”, as a shape of each notch, after entering from one end face of the light guide column, a notch adjacent to the one end face side of the notch (hereinafter “near side”) Light that has passed through the notch), or light that is incident from one end surface of the light guide column and is totally reflected by the front surface portion of the peripheral surface, and then passes through the front notch, is approximately in front of the lamp at the notch. It is set to a shape that reflects toward the back.

  Here, “light passing through the front notch” means that the light reaches the front notch and the first surface of the front notch (that is, the surface on the one end face side of the light guide column) to the external space of the light guide column. This means light that has been once emitted and then re-entered the light guide column from the second surface of the front notch (that is, the surface opposite to the one end surface of the light guide column).

JP 2003-185846 A JP 2006-185664 A

  The conventional lamp configuration has the following problems.

  FIG. 6 is a diagram showing a general part of the conventional lamp configuration based on the lamp configuration described in “Patent Document 2”.

  In the lamp configuration shown in the figure, among the plurality of notches 320N formed on the rear surface portion 320b2 of the peripheral surface 320b of the light guide column 320, the third and subsequent notches N3 from the left end surface 320aL side, which is one end surface of the light guide column 320. , N4, N5,... Are incident from the left end surface 320aL and totally reflected by the front surface portion 320b1 of the peripheral surface 320b, and then light from the light source 330 through the front notches N2, N3, N4,. Are substantially reflected toward the front direction of the lamp, and the second notch N2 from the left end surface 320aL side is incident on the front side notch (that is, the first notch) from the left end surface 320aL. It is formed so that the light passing through the notch) N1 is totally reflected substantially toward the front of the lamp.

  In the lamp configuration shown in the figure, for the second and subsequent notches N2, N3, N4,..., Light reflection control is appropriately performed by using the front notches N1, N2, N3,. However, since the front notch does not exist for the first notch N1, light reflection control similar to the second and subsequent notches N2, N3, N4,... Cannot be performed.

  In addition, the plurality of notches 320N are arranged from the position away from the left end surface 320aL of the light guide column 320 toward the other end surface side (that is, the right end surface side) of the light guide column 320 from the position away from the left end surface 320aL of the light guide column 320 by necessity of using total reflection of light. Will be. For this reason, after entering the first notch N1 from the left end surface 320aL, the light totally reflected by the rear surface portion 320b2 of the peripheral surface 320b reaches, and the amount of light becomes considerably large. Therefore, the reflection direction of this light by the first notch N1 is also aligned with the reflection directions from the second and subsequent notches N2, N3, N4,. This is important for effective utilization of the light source luminous flux.

  However, since the shape of the first notch N1 is restricted due to the light reflection control at the second notch N2, as shown in the figure, the light totally reflected by the rear surface portion 320b2 of the peripheral surface 320b. Is reflected in a direction completely different from the front direction of the lamp at the first notch N1, and the reflection direction cannot be aligned with the reflection direction from the second and subsequent notches N2, N3, N4,. There is a problem that.

  The present invention has been made in view of such circumstances, and is configured so that light emitted from the light source is incident on the light guide column from one end surface thereof and is emitted forward from the peripheral surface thereof. It is an object of the present invention to provide a vehicular lamp that can align the reflection direction from each of a plurality of notches formed on the rear surface portion of the peripheral surface of the light guide column.

  In the present invention, the object is achieved by devising the shapes of the first and second notches from one end face side of the light guide column among the plurality of notches.

That is, the vehicular lamp according to the present invention is
In a vehicle lamp comprising: a light source; and a light guide column that emits light emitted from the light source from one end surface and emits the light forward from the peripheral surface.
A plurality of notches extending in a direction orthogonal to the axial direction of the light guide column on the rear surface portion of the peripheral surface of the light guide column, from the position away from the one end surface toward the other end surface of the light guide column, It is formed in a sawtooth shape in the axial direction,
Among the plurality of notches, the third and subsequent notches from the one end surface side are incident from the one end surface and totally reflected by the front surface portion of the peripheral surface, and then the notches adjacent to the one end surface side of the notch It is formed so that the light passing through it is totally reflected in a predetermined direction,
The first notch from the one end surface is formed so as to totally reflect the light totally reflected on the rear surface portion of the peripheral surface in the predetermined direction after being incident from the one end surface,
The second notch from the one end surface is formed so as to totally reflect the light that has passed through the first notch after entering from the one end surface in the predetermined direction. Is.

  The type of the “light source” is not particularly limited, and for example, a light emitting diode or the like can be employed.

  The “light guide column” means a light guide body extending in a substantially columnar shape. In this case, the cross-sectional shape of the “light guide column” is not particularly limited, and for example, a circular or rectangular cross-sectional shape can be adopted. Further, the “light guide column” may be formed so as to extend linearly or may be formed so as to extend in a curved shape. Furthermore, the specific direction of the direction in which the “light guide column” extends is not particularly limited.

  The “sawtooth shape” means a shape in which wedge-shaped cross-sectional shapes repeat in series. At this time, the wedge-shaped cross-sectional shapes may be arranged in close contact with each other. However, they may be arranged discretely at some intervals. Moreover, the cross-sectional shape of each of these wedge shapes may be a shape in which a corner R is formed at the proximal end portion or the distal end portion thereof.

  The “predetermined direction” may be a direction orthogonal to the axial direction of the light guide column, or may be other directions. The “predetermined direction” may or may not coincide with the front direction of the lamp.

  As shown in the above configuration, in the vehicular lamp according to the present invention, among the plurality of notches formed on the rear surface portion of the circumferential surface of the light guide column, the third and subsequent notches from the one end surface side of the light guide column are After entering from one end face and totally reflecting on the front surface of the peripheral surface, the light passing through the notch adjacent to the one end face side of the notch (that is, the front notch) is totally reflected in a predetermined direction. In addition, the first notch from the one end surface is formed so as to totally reflect the light totally reflected on the rear surface portion of the peripheral surface after entering from the one end surface toward the predetermined direction. The second notch from the one end face is formed so as to totally reflect the light that has passed through the first notch after entering from the one end face in the predetermined direction. Can get the effects like That.

  That is, since the light reflection directions from each of the plurality of notches are all set in the predetermined direction, the light reflection directions from each of the plurality of notches can be made uniform.

  At that time, the first notch is formed so as to totally reflect the light incident on one end surface of the light guide column and then totally reflected on the rear surface portion of the peripheral surface in the predetermined direction. It is possible to effectively use the considerably bright light that is totally reflected at the rear surface portion (that is, the portion located between the one end surface and the first notch).

  In addition, the second notch is appropriately set so that the first and third notches have a predetermined shape, and the reflection function (ie, the second notch itself) The function of totally reflecting the light that has entered from the one end face after passing through the first notch toward the predetermined direction) and the function as the front notch with respect to the third notch can be made compatible. .

  As described above, according to the present invention, in the vehicular lamp configured to cause the light emitted from the light source to enter the light guide column from one end face thereof and to emit the light forward from the peripheral surface thereof, The direction of reflection from each of the plurality of notches formed in the rear surface portion of the peripheral surface can be made uniform. As a result, the appearance as a vehicular lamp can be enhanced, and the light source luminous flux can be effectively used.

  In the above configuration, as the configuration of the light guide column, the plurality of notches described above are formed as the first group, and the rear surface portion of the peripheral surface of the light guide column is positioned away from the first group toward the other end surface side. A plurality of second notches extending in a direction orthogonal to the axial direction are formed as a second group, and the plurality of second notches are formed in a sawtooth shape in the axial direction. Of the second notches, the second and subsequent second notches from the one end face side are incident from the one end face and totally reflected by the front surface portion of the peripheral surface, and then adjacent to the one end face side of the second notch The light passing through the second notch (hereinafter also referred to as “front-side second notch”) is totally reflected toward the predetermined direction, and the first second notch from the one end surface is Incident from the one end face Is formed so as to totally reflect the light totally reflected on the rear surface portion of the peripheral surface in the predetermined direction, and the second notch second from the one end surface has the second notch It is also possible to adopt a configuration in which light is incident from one end surface and totally reflected by the front surface portion of the peripheral surface, and then the light passing through the first second notch is totally reflected in the predetermined direction. It is.

  By adopting such a configuration, the reflection direction from each of the plurality of second notches constituting the second group is also aligned in the same direction as the reflection direction from each of the plurality of notches constituting the first group. be able to. Therefore, the light guide column can be lit for each group at a plurality of locations in the axial direction, thereby changing the appearance as a vehicular lamp.

  At that time, the first second notch is incident from one end surface of the light guide column and totally reflected by the front surface portion of the peripheral surface, and then the light totally reflected by the rear surface portion of the peripheral surface is directed in the predetermined direction. Since it is formed so as to be totally reflected, it is possible to effectively use relatively bright light that is totally reflected by this rear surface portion (that is, a portion located between the first group and the second group).

  In addition, the second second notch is set by appropriately setting the shape of the second second notch on the assumption that the first and third second notches have a predetermined shape. Reflecting function as it is (that is, a function of totally reflecting light incident on the first end face and totally reflected on the front surface portion of the peripheral surface through the first second notch in the predetermined direction) The function as the front second notch with respect to the third second notch can be made compatible.

  In the above configuration, if the light sources are arranged in the vicinity of both end faces of the light guide column, the configuration of the present invention can be configured to have a pair of substantially symmetrical configurations. Therefore, even if the light guide column is quite long, it can be illuminated sufficiently uniformly and sufficiently brightly, thereby further enhancing the appearance as a vehicular lamp.

Plan sectional drawing which shows the vehicle lamp which concerns on one Embodiment of this invention Detailed view of part II in Fig. 1 The same figure as FIG. 2 which shows the 1st modification of the said embodiment. The same figure as FIG. 1 which shows the 2nd modification of the said embodiment. Detailed view of part V in FIG. Figure similar to Figure 2 showing a conventional example

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan sectional view showing a vehicular lamp 10 according to the present embodiment.

  As shown in the figure, the vehicular lamp 10 is a tail lamp provided at the rear end of the vehicle, and includes a lamp body 12 and a transparent translucent cover 14 attached to the front end opening of the lamp body 12. The light guide column 20 extending linearly in the vehicle width direction and a pair of light emitting diodes 30 disposed in the vicinity of the left end surface 20aL and the right end surface 20aR of the light guide column 20 are incorporated in the lamp chamber formed by It has a configuration.

  The vehicular lamp 10 has a left-right symmetric configuration, and is attached to the vehicle body with the front direction of the lamp facing directly behind the vehicle.

  In the description of this embodiment, the directions such as “front” and “rear” are directions as the vehicular lamp 10 and are opposite to the directions as the vehicle.

  The left side light emitting diode 30 is arranged rightward with the light emission center O positioned on the axis Ax of the light guide column 20, and the right side light emitting diode 30 is arranged leftward in a symmetrical relationship with this. Has been.

  Each of the pair of light emitting diodes 30 is fixedly supported by a light source support member 32. Each light source support member 32 is fixedly supported by the lamp body 12.

  The light guide columns 20 are fixedly supported by the light guide column support members 22 at both ends thereof. Each light guide column support member 22 is fixedly supported by each light source support member 32.

  The light guide column 20 is formed in a circular cross section, and a plurality of notches 20AL and 20AR extending in the vertical direction are formed on the rear surface portion 20b2 of the peripheral surface 20b at portions other than both ends thereof.

  The plurality of notches 20AL are formed in a sawtooth shape in the direction of the axis Ax from the position away from the left end surface 20aL of the light guide column 20 by a predetermined distance toward the right end surface 20aR. At this time, the plurality of notches 20AL are arranged so as to be in close contact with each other in the direction of the axis Ax. Each notch 20AL is formed at substantially the same depth so as to bite in a wedge shape toward the diagonally forward right.

  On the other hand, the plurality of notches 20AR are formed in a symmetrical relationship with the plurality of notches 20AL. The plurality of notches 20AL and 20AR are connected at the left and right center positions of the light guide column 20.

  In the vehicular lamp 10 according to the present embodiment, the light emitted from each light emitting diode 30 is incident on the light guide column 20 from the left end surface 20aL and the right end surface 20aR, respectively, and the rear surface portion of the peripheral surface 20b. Each of the plurality of notches 20AL and 20AR formed in 20b2 is totally reflected and then emitted forward from the front surface portion 20b1 of the peripheral surface 20b.

  Below, the structure of the left half part of the light guide column 20 is demonstrated.

  FIG. 2 is a detailed view of part II in FIG.

  As shown in the figure, each of the plurality of notches 20AL formed in the left half portion of the light guide column 20 is configured by a plane whose first surface (that is, the left surface) is inclined to the left side toward the rear. The second surface (that is, the right surface) is a flat surface extending substantially along a vertical surface extending in the lamp front-rear direction.

  Of the plurality of notches 20AL, the third and subsequent notches A3, A4, A5,... Are incident from the left end face 20aL and totally reflected by the front surface portion 20b1 of the peripheral surface 20b, and then the notches A3, .. Light from the light emitting diode 30 via notches A2, A3, A4,... Adjacent to the left side of A4, A5,... (That is, first in each notch A2, A3, A4,. After light is emitted from the surfaces A2a, A3a, A4a,... To the external space of the light guide column 20 and then reentered the light guide column 20 from the second surfaces A2b, A3b, A4b,. It is formed so as to be totally reflected toward.

  In order to realize this, the first surfaces A3a, A4a, A5a,... Of the third and subsequent notches A3, A4, A5,... Are from the light emission center O of the light emitting diode 30 that has reached the center position. The angle of inclination with respect to a vertical plane extending in the front-rear direction of the lamp (same in the following) is set so that the light is totally reflected toward the front direction of the lamp. Specifically, the inclination angles of the first surfaces A3a, A4a, A5a,... Are set to values slightly larger than 45 °. On the other hand, the inclination angles of the second and subsequent second surfaces A3b, A4b, A5b,... Of the third and subsequent notches A3, A4, A5,.

  Strictly speaking, only the light from the light emission center O of the light emitting diode 30 that has reached the center position of the first surfaces A3a, A4a, A5a,... Of each notch A3, A4, A5,. The light from the entire light emitting surface of the light emitting diode 30 reflected from the front direction and reflected from the entire area of each of the first surfaces A3a, A4a, A5a,... Light. This also applies to the following.

  The first notch A1 from the left enters the light from the light emitting diode 30 that is incident from the left end surface 20aL and then totally reflected by the rear surface portion 20b2 of the peripheral surface 20b at the left end portion of the light guide column 20 toward the front direction of the lamp. It is formed so as to be totally reflected.

  In order to realize this, the first surface A1a of the first notch A1 has an inclination angle so that the light from the light emission center O of the light emitting diode 30 that has reached the center position is totally reflected in the front direction of the lamp. The size of is set. Specifically, the inclination angle of the first surface A1a is considerably smaller than the inclination angle of the first surfaces A3a, A4a, A5a,... Of the third and subsequent notches A3, A4, A5,. Is set. On the other hand, the inclination angle of the second surface A1b of the first notch A1 is set to approximately 0 °.

  The second notch A2 from the left is formed so as to totally reflect the light from the light emitting diode 30 via the first notch A1 after entering from the left end face 20aL substantially in the front direction of the lamp.

  In order to realize this, the first surface A2a of the second notch A2 is inclined so that the light from the light emission center O of the light emitting diode 30 that has reached the center position thereof is totally reflected in the front direction of the lamp. The size of is set. Specifically, the inclination angle of the first surface A2a is set to a value slightly smaller than the inclination angle of the first surface A3a of the third notch A3. On the other hand, the second surface A2b of the second notch A2 is emitted from the light emitting center O of the light emitting diode 30 that is emitted from the first surface A2a and reenters the light guide column 20 from the second surface A2b. Formed to slightly incline to the right with respect to a plane extending substantially along a vertical plane extending in the front-rear direction of the lamp so as to be totally reflected toward the front direction of the lamp at the center position of the first surface A3a of the third notch A3. Have been.

  Then, the light that is totally reflected by each of the plurality of notches 20AL and travels in the front direction of the lamp is almost refracted in the left-right direction at the front surface portion 20b1 of the peripheral surface 20b of the light guide column 20, and is substantially in front of the lamp. The light is emitted in the direction. Since the light guide column 20 is formed in a circular cross section, the light totally reflected by each of the plurality of notches 20AL is emitted forward as light diffusing in the vertical direction in the front surface portion 20b1.

  The same applies to the light totally reflected by each of the plurality of notches 20AR formed in the right half of the light guide column 20.

  As described above in detail, in the vehicular lamp 10 according to the present embodiment, the left end of the light guide column 20 among the plurality of notches 20AL formed in the left half portion of the rear surface portion 20b2 on the peripheral surface 20b of the light guide column 20. The third and subsequent notches A3, A4, A5,... From the surface 20aL are incident from the left end surface 20aL and totally reflected by the front surface portion 20b1 of the peripheral surface 20b, and then the notches A2, A3, A4 adjacent to the left side thereof. The light passing through (that is, the front notch) is formed so as to be totally reflected toward the front direction of the lamp, and after the first notch A1 from the left is incident from the left end surface 20aL, It is formed so that the light totally reflected by the rear surface portion 20b2 of the peripheral surface 20b is totally reflected toward the front direction of the lamp, and the second notch A2 from the left is incident from the left end surface 20aL. The light that has passed through the first notch A1, is formed so as to totally reflect substantially toward lamp forward direction, it is possible to obtain the following effects.

  That is, since the light reflection directions from each of the plurality of notches 20AL located in the left half of the light guide column 20 are all set substantially in the front direction of the lamp, the light reflection directions from each of the plurality of notches 20AL are changed. Can be aligned.

  At that time, the first notch A1 is formed so as to totally reflect the light that is incident from the left end surface 20aL of the light guide column 20 and then totally reflected by the rear surface portion 20b2 of the peripheral surface 20b toward the front direction of the lamp. Therefore, it is possible to effectively use the considerably bright light that is totally reflected by the rear surface portion 20b2 (that is, the portion located between the left end surface 20aL and the first notch A1).

  As for the second notch A2, the shape of the second notch A2 is set as appropriate, assuming that the first and third notches A1 and A3 have a predetermined shape. Reflection function (that is, a function of totally reflecting light that has entered the left end surface 20aL and then passed through the first notch A1 substantially toward the front of the lamp), and a front notch for the third notch A3. Both functions can be achieved.

  As described above, according to the present embodiment, the light emitted from the light emitting diode 30 is incident on the light guide column 20 from the left end surface 20aL and is emitted forward from the peripheral surface 20b. In the lamp 10, the reflection direction from each of the plurality of notches 20AL formed on the rear surface portion 20b2 of the peripheral surface 20b of the light guide column 20 can be made uniform. As a result, the appearance of the vehicular lamp 10 can be enhanced, and the light source luminous flux can be effectively used.

  Moreover, since the vehicular lamp 10 according to the present embodiment has a bilaterally symmetric configuration, the light reflection direction from each of the plurality of notches 20AR located in the right half of the light guide column 20 is also left. The light reflection direction from each of the plurality of notches 20AL located in the half can be aligned. Therefore, even if the light guide column 20 is quite long, it can be illuminated sufficiently uniformly and sufficiently brightly, whereby the appearance of the vehicular lamp 10 can be further enhanced.

  Next, a modification of the above embodiment will be described.

  FIG. 3 is a view similar to FIG. 2 showing a first modification of the above embodiment.

  As shown in the figure, the basic configuration of this modification is the same as that of the above embodiment, but the configuration of the plurality of notches 120BL is different from that of the above embodiment.

  That is, in the present modification, the plurality of notches 120BL are not in close contact with each other like the plurality of notches 20AL in the above-described embodiment, but are arranged discretely at some intervals.

  Also in this modification, among the plurality of notches 120BL formed on the left half of the rear surface portion 120b2 on the peripheral surface 120b of the light guide column 120, the third and subsequent notches B3, B4,. Is incident on the front surface 120b1 of the peripheral surface 120b, and then totally reflected by the front surface 120b1, and then the light passing through the notches B2, B3,... (That is, the front notch) adjacent to the left is totally reflected in the front direction of the lamp. It is formed to let you.

  The first B1 from the left is formed so as to totally reflect the light that has entered from the left end surface 120aL and then totally reflected by the rear surface portion 120b2 of the peripheral surface 120b toward the front direction of the lamp.

  The second notch B2 from the left is formed so as to totally reflect the light that has passed through the first notch B1 after entering from the left end surface 120aL toward the front direction of the lamp.

  Even in the case of adopting the configuration of this modified example, the light reflection directions from each of the plurality of notches 120BL located in the left half of the light guide column 120 are all substantially in the lamp front direction. The light reflection direction from each can be made uniform. And thereby, the effect similar to the said embodiment can be acquired.

  FIG. 4 is a view similar to FIG. 1 showing a second modification of the above embodiment.

  As shown in the figure, the basic configuration of this modification is the same as that of the above embodiment, but the configuration of the plurality of notches 220CL1 and 220CR1 and the second notches 220CL2 and 220CR2 is the same as that of the above embodiment. It is different from the case of.

  That is, in the left half part of the light guide column 220 of the present modification, there are a plurality of notches 220CL1 similar to the plurality of notches 20AL in the above-described embodiment, and the first group has a smaller number than the plurality of notches 20AL in the above-described embodiments. A plurality of second notches 220CL2 are formed as a second group G2 at a position away from the first group G1 of the rear surface portion 220b2 on the circumferential surface 220b. At this time, like the plurality of notches 220CL1, the plurality of second notches 220CL2 are all formed to extend in the vertical direction at substantially the same depth, and are arranged so as to be in close contact with each other in the axis Ax direction. Yes.

  Also in the right half of the light guide column 220 of this modification, a plurality of notches 220CR1 having a shape symmetrical to the plurality of notches 20CL1 are formed as a first group G1, and a plurality of second notches 20CL2 A plurality of second notches 220CR2 having a symmetrical shape are formed as a second group G2. At that time, an interval similar to the interval between the first group G1 and the second group G2 is provided between the second group G2 on the left side and the second group G2 on the right side.

  Below, the structure of the left half part of the light guide column 220 is demonstrated.

  FIG. 5 is a detailed view of a portion V in FIG.

  As shown in the figure, the plurality of second notches 220CL2 constituting the second group G2 are formed in a sawtooth shape in the axis Ax direction, like the plurality of notches 220CL1 constituting the first group G1, Their optical functions are different.

  That is, among the plurality of second notches 220CL2, the second and subsequent second notches C3, C4, C5,... Are incident from the left end surface 220aL and totally reflected by the front surface portion 220b1 of the peripheral surface 220b. The light passing through the second notches C2, C3, C4,... (That is, the second notch on the front side) adjacent to the left side is totally reflected toward the front direction of the lamp.

  The first second notch C1 from the left is incident on the left end face 220aL, is totally reflected by the front face 220b1 of the peripheral face 220b, and then totally reflected by the rear face 220b2 of the peripheral face 220b. It is formed so as to be totally reflected in the direction.

  The second notch C2 that is second from the left enters the left end surface 220aL and is totally reflected by the front surface portion 220b1 of the peripheral surface 220b, and then passes the light that has passed through the first second notch C1 substantially in the front direction of the lamp. It is formed so as to be totally reflected toward.

  By adopting the configuration of this modification, the reflection direction from each of the plurality of second notches 220CL2 constituting the second group G2 is also the reflection direction from each of the plurality of notches 220CL1 constituting the first group G1. Can be aligned in the same direction.

  At that time, the first second notch C1 in the second group G2 is incident from the left end surface 220aL, totally reflected by the front surface portion 220b1 of the peripheral surface 220b, and then totally reflected by the rear surface portion 220b2 of the peripheral surface 220b. Is totally reflected toward the front direction of the lamp, so that it is relatively bright and totally reflected by the rear surface portion 220b2 (that is, the portion located between the first group G1 and the second group G2). Light can be used effectively.

  Further, regarding the second second notch C2 in the second group G2, it is assumed that the first and third second notches C1 and C3 have a predetermined shape by appropriately setting the shape thereof. Thus, the reflection function as the second second notch C2 itself (that is, the light incident through the left end surface 220aL and totally reflected by the front surface portion 220b1 of the peripheral surface 220b is reflected through the first second notch C1. , The function of totally reflecting the light toward the front of the lamp) and the function of the second notch on the near side with respect to the third second notch C3.

  Since the vehicular lamp 210 according to this modification also has a bilaterally symmetric configuration, the light incident from the right end surface 220aR in the right half of the light guide column 220 is a plurality of light beams constituting the first group G1. Each of the notches 220CR1 and each of the plurality of notches 220CR2 constituting the second group G2 are totally reflected substantially in the front direction of the lamp. Therefore, the light guide column 220 can be illuminated for each group at four locations in the direction of the axis Ax, thereby changing the appearance of the vehicular lamp 210.

  In addition, the numerical value shown as a specification in the said embodiment and each modification is only an example, and of course, you may set these to a different value suitably.

  Further, in the above embodiment and each modification, the case where the vehicle lamps 10 and 210 are tail lamps provided at the rear end of the vehicle has been described. By adopting the same configuration as the above, it is possible to obtain the same operational effects as the above-described embodiment and the like.

10, 210 Vehicle lamp 12 Lamp body 14 Translucent cover 20, 120, 220, 320 Light guide column 20AL, 20AR, 120BL, 220CL1, 220CR1, 320N Notch 20aL, 120aL, 220aL, 320aL Left end surface 20aR, 220aR Right end surface 20b, 120b, 220b, 320b Peripheral surfaces 20b1, 120b1, 220b1, 320b1 Front surface 20b2, 120b2, 220b2, 320b2 Rear surface 22 Light guide column support member 30 Light emitting diode 32 Light source support member 220CL2, 220CR2 Second notch 330 Light source Ax Axis A1, B1 , N1 1st notch A1a, A2a, A3a, A4a, A5a 1st surface A1b, A2b, A3b, A4b, A5b 2nd surface A2, B2, N2 2nd notch A3, B3 N3 3rd notch A4, B4, N4 4th notch A5, N5 5th notch C1 1st 2nd notch C2 2nd 2nd notch C3 3rd 2nd notch C4 4th 2nd notch C5 5th second notch O emission center

Claims (3)

In a vehicle lamp comprising: a light source; and a light guide column that emits light emitted from the light source from one end surface and emits the light forward from the peripheral surface.
A plurality of notches extending in a direction orthogonal to the axial direction of the light guide column on the rear surface portion of the peripheral surface of the light guide column, from the position away from the one end surface toward the other end surface of the light guide column, It is formed in a sawtooth shape in the axial direction,
Among the plurality of notches, the third and subsequent notches from the one end surface side are incident from the one end surface and totally reflected by the front surface portion of the peripheral surface, and then the notches adjacent to the one end surface side of the notch It is formed so that the light passing through it is totally reflected in a predetermined direction,
The first notch from the one end surface is formed so as to totally reflect the light totally reflected on the rear surface portion of the peripheral surface in the predetermined direction after being incident from the one end surface,
The second notch from the one end surface is formed so as to totally reflect the light that has passed through the first notch after entering from the one end surface in the predetermined direction. Vehicle lamp. The plurality of notches are formed as a first group, and the rear surface portion of the circumferential surface of the light guide column is perpendicular to the axial direction of the light guide column at a position away from the first group to the other end surface side. A plurality of second notches extending in the direction are formed as a second group,
The plurality of second notches are formed in a sawtooth shape in the axial direction,
Among the plurality of second notches, the third and subsequent second notches from the one end surface side are incident from the one end surface and totally reflected by the front surface portion of the peripheral surface, and then the one end surface of the second notch. The light passing through the second notch adjacent to the side is formed so as to be totally reflected in the predetermined direction,
The first second notch from the one end surface is incident from the one end surface and totally reflected by the front surface portion of the peripheral surface, and then the light totally reflected by the rear surface portion of the peripheral surface is directed in the predetermined direction. It is formed to totally reflect,
The second notch that is second from the one end surface is incident from the one end surface and totally reflected by the front surface portion of the peripheral surface, and then the light that has passed through the first second notch is directed in the predetermined direction. The vehicular lamp according to claim 1, wherein the vehicular lamp is formed so as to be totally reflected.   The vehicular lamp according to claim 1 or 2, wherein the light sources are respectively disposed in the vicinity of both end faces of the light guide column.

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