JP2019102294A - Vehicular lighting fixture - Google Patents

Abstract

To allow emission light from a light emitting diode to enter an optical fiber efficiently by saving space, in a vehicular lighting fixture including a side surface light emitting type optical fiber.SOLUTION: Light emitted from a light emitting diode 50 and condensed in a condensing lens 60 is allowed to enter an end surface 30a with respect to a side surface light emitting type optical fiber 30. At that time, by forming a reflection surface 62d at a cylindrical holder 62 for supporting the end part of the optical fiber 30, a function as a reflector is imparted for reflecting the light going toward the periphery of the end surface 30a of the optical fiber 30 from the condensing lens 60 toward the end surface 30a. Thereby, even when the diameter of the condensing lens 60 is reduced or the size of a light emitting part 50a of the light emitting diode 50 is increased, the light toward the direction deviated from the end surface 30a of the optical fiber 30 can be made to enter the optical fiber 30. Thereby, a space for arrangement of the condensing lens 60 is reduced, and an incident light amount into the optical fiber 30 can be secured sufficiently.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle lamp provided with a side light emitting type optical fiber.

  2. Description of the Related Art Conventionally, there has been known a side-emitting type optical fiber configured to emit light incident from an end face from a side surface (i.e., an outer peripheral surface).

  Patent Document 1 describes a vehicular lamp provided with such an optical fiber.

  In the vehicle lamp described in this "patent document 1", it is the structure which makes the emitted light from a laser diode enter into an optical fiber.

JP 2017-27662 A

  In a vehicle lamp provided with a side-emitting type optical fiber, it is desirable to make the optical fiber emit light with as high luminance as possible in order to enhance its visibility.

  As a method for realizing this, it is conceivable to use a light emitting diode having a larger amount of emitted light as a light source as compared to a laser diode, but since the emitted light from the light emitting diode becomes diffused light, A condenser lens is required to direct and condense the light.

  At that time, in order to make the light emitted from the light emitting diode efficiently enter the optical fiber, it is preferable to use a condenser lens with the largest possible diameter, but securing space for arranging a large diameter condenser lens in the vehicle lamp It is not easy to do.

  The present invention has been made in view of such circumstances, and in a vehicle lamp provided with a side light emission type optical fiber, efficiently emitting emitted light from a light emitting diode to the optical fiber in a space-saving manner. It is an object of the present invention to provide a vehicular lamp capable of

  The present invention achieves the above object by providing a predetermined reflector.

That is, the vehicle lamp according to the present invention
A light emitting diode, a condensing lens for condensing emitted light from the light emitting diode, and a side light emitting optical fiber configured to cause the light emitted from the condensing lens to be incident from an end face and emitted from a side surface; In a vehicle lamp provided with
A reflector is disposed around the end face of the optical fiber to reflect light directed from the focusing lens to the periphery of the end face toward the end face.

  The specific configuration of the above “condenser lens” is not particularly limited as long as it can condense the light emitted from the light emitting diode toward the end face of the optical fiber, and is constituted by a single lens It may be made up of a plurality of lenses.

  The specific configuration such as the size of the diameter and the length thereof is not particularly limited as long as the “optical fiber” is configured to emit light incident from its end face from its side surface.

  If the above-mentioned "reflector" is configured to reflect light directed from the condenser lens to the periphery of the end face of the optical fiber toward the end face of the optical fiber, the specific configuration such as the external shape and the reflective surface shape is It is not particularly limited.

  The above-mentioned "vehicle lamp" may have a configuration in which the light emitting diode, the condensing lens and the reflector may be disposed only on one end surface side of the optical fiber, or in the configuration disposed on the both end surface sides thereof It is also good.

  The vehicle lamp according to the present invention has a configuration in which the light emitted from the light emitting diode and collected by the condenser lens is made to enter the side surface light emitting optical fiber from the end face thereof. A reflector for reflecting light directed from the condenser lens to the periphery of the end face of the optical fiber toward the end face is disposed around the periphery, so that the following effects can be obtained.

  That is, even if the light from the light emission center of the light emitting diode is focused on the center of the end face of the optical fiber as a vehicle lamp, the light emitting diode has a light emitting portion of a certain size. Since there is variation in the arrangement, part of the light emitted from the light emitting portion is not collected on the end face of the optical fiber, but becomes light directed in the direction away from the end face.

  In particular, in the case where the diameter of the condenser lens is reduced, the light collection accuracy is reduced, so that the light traveling in the direction away from the end face of the optical fiber is increased. Further, even when the size of the light emitting portion is increased in order to increase the amount of light emitted from the light emitting diode, the amount of light traveling in the direction away from the end face of the optical fiber is increased.

  In that respect, in the present invention, a reflector is disposed around the end face of the optical fiber to reflect light directed from the focusing lens to the end face of the optical fiber toward the end face, so the diameter of the focusing lens is reduced. Even in such a case, or even when the size of the light emitting portion of the light emitting diode is increased, light traveling in the direction away from the end face of the optical fiber can be made incident on the optical fiber. Therefore, it is possible to secure a sufficient amount of light incident on the optical fiber while reducing the space for arranging the condenser lens.

  As described above, according to the present invention, in the vehicle lamp provided with the side surface light emission type optical fiber, the outgoing light from the light emitting diode can be efficiently made incident on the optical fiber with a small space.

  Further, according to the present invention, even when the diameter of the optical fiber is reduced, the light emitted from the condensing lens can be made to reach the end face of the optical fiber and be incident on the optical fiber. And by adopting such a configuration, it is possible to cause the optical fiber to emit light with higher luminance, thereby further improving the design of the vehicular lamp.

  In the above configuration, when the condensing lens is configured by a pair of convex lenses disposed in the opposite direction, compared to the case where the condensing lens is configured by a single convex lens, the light from the light emitting diode It is possible to enhance the ability to collect the emitted light on the end face of the optical fiber.

  At this time, if each of the pair of convex lenses is composed of a biconvex lens in which the curvatures of the lens surfaces facing each other are larger than the curvatures of the opposite lens surfaces, the light condensing property of the light emitted from the light emitting diode on the end face of the optical fiber Can be further enhanced.

  In the above configuration, if the reflecting surface of the reflector is a conical surface extending from the position of the outer peripheral edge of the end face of the optical fiber at a half apex angle of 60 ° or more centering on the central axis of the optical fiber, the end face of the optical fiber It becomes possible to cause the light traveling in the direction away from the end surface of the optical fiber to reach the end surface of the optical fiber without blocking the light traveling toward the end by the reflector.

  In the above configuration, if the reflector is integrally formed with the cylindrical holder for supporting the end of the optical fiber, the above-described effects can be obtained without increasing the number of parts.

  At that time, if the inner peripheral surface of the cylindrical holder is configured as a reflection surface, light that is emitted from the side surface near the end face immediately after entering the optical fiber because the incident angle to the end face of the optical fiber is large The light can be reflected by the reflection surface of the cylindrical holder and returned to the inside of the optical fiber.

A front view showing a vehicle lamp according to an embodiment of the present invention Detailed cross-sectional view of part II of FIG. 1 A view similar to FIG. 2 showing different light paths (A) is a detailed view of a portion IVa of FIG. Detail view of V in FIG. 3 The front view which shows the said vehicle lamp in a lighting state The figure similar to FIG. 5 which shows the modification of the said embodiment

  Hereinafter, embodiments of the present invention will be described using the drawings.

  FIG. 1 is a front view showing a vehicular lamp 10 according to an embodiment of the present invention.

  As shown in FIG. 1, the vehicle lamp 10 according to the present embodiment is a tail lamp disposed at the rear end of the vehicle, and a transparent body 14 in the form of a through-hole attached to the lamp body 12 and its front end opening. The three light emitting units 20 are arranged in the upper and lower three stages in the lamp chamber formed by and the extension panel 16 is arranged on the front side (the rear side as the vehicle).

  The three light emitting units 20 all have the same configuration.

  Each light emitting unit 20 includes an optical fiber 30 extending in the vehicle width direction, and a pair of left and right light source units 40 disposed at both ends of the optical fiber 30.

  The optical fiber 30 is configured as a side light emission type optical fiber that emits the light incident from the end face 30a from the side surface (that is, the outer peripheral surface) 30b.

  The optical fiber 30 is made of a flexible transparent resin material and has an outer diameter of about 1 mm. The optical fiber 30 is composed of a core and a clad that covers the core, and for example, a urethane resin is used as a transparent resin material that constitutes the core, and the clad is, for example, fluorocarbon resin having a smaller refractive index than the core. It is used.

  The optical fiber 30 has a light diffusing agent dispersed in its cladding, thereby realizing side emission. In addition, it is also possible to set it as the structure by which the light-diffusion process (for example, embossing etc.) was given to the outer peripheral surface of a core instead of setting it as such a structure.

  Each of the left and right light source units 40 has the same configuration (this will be described later). Each light source unit 40 is fixed to the lamp body 12 (or the extension panel 16) via a support member (not shown).

  The extension panel 16 has a horizontally long rectangular opening 16a. The extension panel 16 exposes the optical fiber 30 of each light emitting unit 20 to the inner peripheral space of the opening 16a and shields the light source units 40 disposed at both ends in the front view of the lamp. ing. The extension panel 16 is fixed to the lamp body 12.

  FIG. 2 is a detailed cross-sectional view of a portion II of FIG. 1 and shows the light source unit 40 in a state where the left end portion of the optical fiber 30 is connected in the light emitting unit 20 disposed in the upper stage.

  As shown in FIG. 2, the light source unit 40 includes a light emitting diode 50, a condensing lens 60 for condensing the light emitted from the light emitting diode 50, and a cylindrical holder 62 for supporting an end of the optical fiber 30. The light emitted from the condenser lens 60 is made to enter the optical fiber 30 from the end face 30 a thereof.

  The light emitting diode 50 is a red light emitting diode, and is disposed on the optical axis Ax of the condensing lens 60 with the light emitting unit 50 a directed to the right. The light emitting diodes 50 are supported by a light source support plate 64, and the light source support plate 64 is supported by a heat sink 66.

  The condenser lens 60 is composed of a pair of convex lenses 60A and 60B disposed in the opposite direction to each other. Each of the pair of convex lenses 60A and 60B is formed of a biconvex lens in which the curvatures of the lens surfaces 60Aa and 60Ba facing each other are larger than the curvatures of the opposite lens surfaces 60Ab and 60Bb.

  Each convex lens 60A, 60B has an outer peripheral flange portion 60Ac, 60Bc, and is supported by the casing 70 at the outer peripheral flange portion 60Ac, 60Bc. The effective diameter of the condenser lens 60 is set to a value of about 10 to 20 mm (e.g., 15 mm).

  The housing 70 is formed in a cylindrical shape so as to extend along the optical axis Ax, and the inner diameter thereof is set to substantially the same value as the outer diameter of the outer peripheral flanges 60Ac, 60Bc of the respective convex lenses 60A, 60B. ing. At the right end portion of the housing 70, an inner peripheral flange portion 70a protruding to the inner peripheral side is formed.

  The pair of convex lenses 60A and 60B is accommodated in the inner peripheral space of the housing 70 together with the long cylindrical member 72 and the short cylindrical member 74.

  Specifically, the convex lens 60B on the right side is disposed in a state where the outer peripheral flange portion 60Bc is in contact with the inner peripheral flange portion 70a of the housing 70. A long cylindrical member 72 is disposed on the left side of the convex lens 60B in a state of being in contact with the outer peripheral flange portion 60Bc. The left convex lens 60A is disposed with its outer peripheral flange portion 60Ac in contact with the cylindrical member 72. On the left side of the convex lens 60A, a short cylindrical member 74 is disposed in contact with the outer peripheral flange portion 60Ac.

  At this time, the length of the cylindrical member 72 is set such that the pair of convex lenses 60A and 60B are arranged at a slight distance. The length of the cylindrical member 74 is set such that the left end face thereof is flush with the left end face of the housing 70.

  The housing 70 is in contact with the light source support plate 64 at its left end face in a state in which the pair of convex lenses 60A, 60B and two long and short cylindrical members 72, 74 are accommodated in the inner circumferential side space. It is fixed to the heat sink 66 together with the light source support plate 64 by screwing or the like.

  The cylindrical holder 62 is disposed in a state in which the inner peripheral space is closed at the right end portion of the housing 70.

  The cylindrical holder 62 has an outer peripheral flange portion 62c, and is fixed to the right end surface of the housing 70 by screwing or the like at the outer peripheral flange portion 62c.

  At the center position of the cylindrical holder 62, a fiber insertion hole 62a having an inner diameter substantially the same as the outer diameter of the optical fiber 30 is formed to extend along the optical axis Ax. The optical fiber 30 is inserted from the right to the fiber insertion hole 62a, and is fixedly supported by the cylindrical holder 62 in a state where the position of the end face 30a coincides with the position of the left end edge of the fiber insertion hole 62a. The fixed support is performed by press-fitting or bonding the end of the optical fiber 30 to the fiber insertion hole 62a.

  A cylindrical portion 62b which protrudes rightward along the optical axis Ax is formed on the right end face of the cylindrical holder 62, thereby securing the length of the fiber insertion hole 62a to a certain extent.

  As shown in FIG. 2, the focusing lens 60 has its left focal point set at the center position of the light emitting unit 50 a of the light emitting diode 50 (that is, the position on the optical axis Ax), and its right focal point is The position is set at the center position of the end face 30 a of the optical fiber 30 (that is, the position on the optical axis Ax).

  Therefore, light emitted from the center position (that is, the light emission center) of the light emitting portion 50 a of the light emitting diode 50 is condensed by the condensing lens 60 at the center position of the end face 30 a of the optical fiber 30.

  FIG. 3 is a view similar to FIG. 2 showing an optical path of light emitted from the upper end position of the light emitting unit 50 a of the light emitting diode 50.

  As shown in FIG. 3, the light emitted from the upper end position of the light emitting unit 50 a of the light emitting diode 50 is condensed near the lower end position of the end face 30 a of the optical fiber 30 by the condensing lens 60. Therefore, the light is not condensed at one point, and a part of the light is directed to a direction away from the end face 30a.

  4 (a) is a detailed view of a portion IVa of FIG. 2, and FIG. 4 (b) is a view in the direction of arrow b.

  As shown in FIG. 4, the light emitting diode 50 is configured such that the light emitting chip 52 is accommodated in the package 56 via the substrate 54.

  The light emitting chip 52 has a square light emitting surface 52a having a side length of about 1 mm, and is disposed in a state where the center position of the light emitting surface 52a is positioned on the optical axis Ax.

  The substrate 54 has an outer shape in which a part of a square having a side length of about 4 mm is missing, and is disposed in a state of being fitted to the inner bottom surface of the package 56. The substrate 54 is formed of a white member, and diffuses and reflects light incident on the surface.

  A sealing material 58 covering the light emitting chip 52 and the substrate 54 is filled in the package 56. The sealing material 58 is made of transparent silicone resin or the like, and is filled at a predetermined depth. At this time, the surface of the sealing material 58 is located slightly to the left of the right end surface of the outer peripheral flange portion 56 a of the package 56.

  A reflective sheet 80 is attached to the right end face of the outer peripheral flange 56 a of the package 56. A circular opening 80 a is formed in the reflection sheet 80. The opening 80a has a diameter larger than the circumscribed circle of the light emitting chip 52 (specifically, a diameter of about 1.5 to 3 mm (for example, 2 mm)), and in the state of being attached to the package 56 The position is formed on the optical axis Ax. The inner surface (i.e., the left surface) of the reflective sheet 80 is subjected to a reflection process such as aluminum deposition, whereby the inner surface is configured as a reflective surface 80b.

  In the light emitting diode 50, most of the light emitted from the light emitting surface 52a of the light emitting chip 52 passes through the space on the inner peripheral side of the opening 80a and becomes diffused light to the right and the condensing lens 60 (convex lens 60A) The light emitted at a large angle with respect to the optical axis Ax is totally reflected on the surface of the sealing material 58.

  At that time, light emitted from the outer peripheral edge of the light emitting surface 52 a of the light emitting chip 52 and totally reflected by the surface of the sealing material 58 reaches the surface of the substrate 54 and is diffusely reflected on this surface. A part of the diffusely reflected light is directed from the inner peripheral space of the opening 80a toward (the convex lens 60A of) the condenser lens 60, and the remaining part is reflected by the reflection surface 80b of the reflection sheet 80 for sealing. Re-enter the material 58. Then, the light re-incident on the sealing material 58 reaches the surface of the substrate 54 and is diffusely reflected on the surface. Further, a part of the diffusely reflected light becomes light directed in the direction toward the optical axis Ax, and is emitted from the surface of the sealing material 58 toward the inner peripheral space of the opening 80a, Light directed to the convex lens 60A).

  As described above, in the light emitting diode 50, not only light directly emitted from the light emitting surface 52a of the light emitting chip 52 but also diffuse reflected light from the surface of the substrate 54 is emitted from the inner peripheral space of the opening 80a. ing. That is, in the light emitting diode 50, the space on the inner peripheral side of the opening 80a of the reflection sheet 80 constitutes the light emitting unit 50a.

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

  As also shown in FIG. 5, the cylindrical holder 62 has a function as a reflector for reflecting light directed from the condenser lens 60 (of the convex lens 60B) to the periphery of the end face 30a of the optical fiber 30 toward the end face 30a. There is.

  That is, on the left end surface of the cylindrical holder 62, a reflection surface 62d is formed in an annular region surrounding the end surface 30a of the optical fiber 30. The reflecting surface 62 d is formed by subjecting the left end surface of the cylindrical holder 62 to a vapor deposition process or the like.

  The reflecting surface 62d is formed of a curved surface which extends from the left end edge of the fiber insertion hole 62a (that is, the position of the outer peripheral edge of the end face 30a of the optical fiber 30) to the left direction about the optical axis Ax. Specifically, the reflecting surface 62d is formed of a curved surface whose center axis is the optical axis Ax. More specifically, the reflecting surface 62d is formed of a conical surface having the optical axis Ax as a central axis, and the half apex angle θ has a value of 60 ° or more (specifically, 60 to 65 ° (for example, 62))). Further, the outer diameter of the reflecting surface 62d is set to a value of about φ80 to 120 mm (for example, 100 mm).

  Then, the cylindrical holder 62 causes the light traveling from the condenser lens 60 to the periphery of the end face 30 a to be incident on the end face 30 a of the optical fiber 30 by reflecting the light in the direction near the optical axis Ax at the reflection surface 62 d. It is supposed to be.

  The optical path shown by a two-dot chain line in FIG. 5 is an optical path of light traveling from the condensing lens 60 to the periphery of the end face 30 a of the optical fiber 30 when the reflecting surface 62 d of the cylindrical holder 62 is not present.

  FIG. 6 is a front view showing the vehicular lamp 10 in a lit state.

  As shown in FIG. 6, in each of the three light emitting units 20, the light emitting diodes 50 of the left and right light source units 40 are turned on, whereby light is emitted from the left and right end surfaces 30a of the optical fiber 30. Enters the optical fiber 30 and is emitted from the side surface 30 b at each position in the longitudinal direction while being guided inside the optical fiber 30.

  As a result, in the space on the inner peripheral side of the opening 16a of the extension panel 16, the optical fibers 30 of the three light emitting units 20 appear to be brightly lighted linearly at constant intervals in the vertical direction.

  Next, the operation and effect of the present embodiment will be described.

  The vehicle lamp 10 according to the present embodiment has a configuration in which light emitted from the light emitting diode 50 and condensed by the condenser lens 60 is made incident on the side surface light emitting optical fiber 30 from the end face 30a. A cylindrical holder 62 having a function as a reflector for reflecting light directed from the condenser lens 60 to the periphery of the end face 30a of the optical fiber 30 toward the end face 30a is disposed around the end face 30a of the optical fiber 30 Therefore, the following effects can be obtained.

  That is, although the vehicular lamp 10 is configured to condense light emitted from the light emission center of the light emitting diode 50 at the center of the end face 30 a of the optical fiber 30 by the condensing lens 60, the light emitting diode 50 has a certain size The light emitting unit 50a has a light emitting unit 50a, and there is variation in the arrangement, so that part of the light emitted from the light emitting unit 50a can not be condensed on the end surface 30a of the optical fiber 30, and is deviated from the end surface 30a. It will be a light to go.

  In particular, in the case where the diameter of the condenser lens 60 is reduced as in the present embodiment, the light collection accuracy is lowered, so that the light traveling in the direction away from the end face 30 a of the optical fiber 30 is increased. Further, even when the size of the light emitting portion 50a is increased to increase the amount of light emitted from the light emitting diode 50 as in the present embodiment, the light traveling in the direction away from the end face 30a of the optical fiber 30 increases. I will.

  In that respect, in the present embodiment, a tubular shape having a function as a reflector for reflecting light directed from the condenser lens 60 to the periphery of the end face 30a of the optical fiber 30 toward the end face 30a around the end face 30a of the optical fiber 30 Since the holder 62 is disposed, even when the diameter of the condenser lens 60 is reduced or the size of the light emitting portion 50 a of the light emitting diode 50 is increased, the optical fiber 30 is obtained. The light traveling in the direction away from the end face 30a can be reflected by the reflection surface 62d of the cylindrical holder 62 and be incident on the optical fiber 30 from the end face 30a. Therefore, it is possible to secure a sufficient amount of light incident on the optical fiber 30 while reducing the space for arranging the condenser lens 60.

  As described above, according to the present embodiment, in the vehicular lamp 10 provided with the side surface light emitting optical fiber 30, the light emitted from the light emitting diode 50 can be efficiently incident on the optical fiber 30 with a small space.

  Further, even when the diameter of the optical fiber 30 is reduced as in the present embodiment, the light emitted from the condensing lens 60 can be made to reach the end face 30 a of the optical fiber 30 and be incident on the optical fiber 30. Therefore, the optical fiber 30 can be made to emit light with higher brightness, which can further enhance the design of the vehicular lamp 10.

  Moreover, in the present embodiment, not only direct light from the light emitting surface 52 a of the light emitting chip 52 but also diffuse reflected light from the surface of the substrate 54 is included as light emitted from the light emitting portion 50 a of the light emitting diode 50. Therefore, more light emitted from the light emitting diode 50 can be incident on the optical fiber 30.

  In the present embodiment, since the condensing lens 60 is configured by a pair of convex lenses 60A and 60B disposed in the opposite direction to each other, the condensing lens 60 is configured by a single convex lens. As compared with the above, the light collecting property of the light emitted from the light emitting diode 50 on the end face 30 a of the optical fiber 30 can be enhanced.

  In this case, each of the convex lenses 60A and 60B is a biconvex lens in which the curvatures of the lens surfaces 60Aa and 60Ba facing each other are larger than the curvatures of the lens surfaces 60Ab and 60Bb on the opposite side. The light collecting property to the end face 30 a of the optical fiber 30 can be further enhanced.

  In the present embodiment, the cylindrical holder 62 having a function as a reflector has a reflection surface 62d of 60 ° around the optical axis Ax (that is, the central axis of the optical fiber) from the position of the outer peripheral edge of the end face 30a of the optical fiber 30. Since it is constituted by a conical surface extending at the above half apex angle, the light traveling from the condenser lens 60 to the end face 30a of the optical fiber 30 is not blocked by the cylindrical holder 62 having a function as a reflector It becomes possible to cause light traveling in a direction out of the end face 30a of 30 to reach the end face 30a of the optical fiber 30.

  Moreover, as in the present embodiment, the reflector and the cylindrical holder 62 for supporting the end of the optical fiber 30 are integrally formed, so that the above-described effects can be obtained without increasing the number of parts. it can.

  As a matter of course, instead of integrally forming the reflector with the cylindrical holder 62, it is of course possible to configure the reflector as an independent member.

  In the above embodiment, it has been described that not only the direct light from the light emitting surface 52a of the light emitting chip 52 but also the diffuse reflected light from the surface of the substrate 54 is included as the emitted light from the light emitting portion 50a of the light emitting diode 50 Alternatively, only the direct light from the light emitting surface 52a of the light emitting chip 52 may be used.

  In the above embodiment, the optical fiber 30 of each light emitting unit 20 is described as extending in the vehicle width direction, but it is arranged to extend in other directions (for example, up and down direction or oblique direction) Configuration is also possible.

  In the above embodiment, although the case where the vehicle lamp 10 is a tail lamp disposed at the rear end of the vehicle has been described, the same configuration as the above embodiment is adopted regardless of the location or function provided in the vehicle. Thus, the same effects as those of the above embodiment can be obtained.

  Next, modifications of the above embodiment will be described.

  FIG. 7 is a view similar to FIG. 5 showing the main part of the vehicle lamp according to the present modification.

  As shown in FIG. 7, the basic configuration of this modification is the same as that of the above embodiment, but the configuration of the cylindrical holder 162 is partially different from that of the above embodiment.

  That is, as in the case of the cylindrical holder 62 of the above embodiment, the cylindrical holder 162 of this modification also has a configuration in which a fiber insertion hole 162a for inserting the optical fiber 30 and a reflecting surface 162d functioning as a reflector are formed. However, the inner circumferential surface of the fiber insertion hole 162a is further subjected to an aluminum deposition process or the like, whereby the inner circumferential surface is configured as a reflecting surface 168, which is different from the case of the above embodiment. .

  By adopting the configuration of the present modification, as shown by a two-dot chain line in FIG. 7, after being reflected by the reflection surface 162 d of the cylindrical holder 162, when entering the end face 30 a of the optical fiber 30, the incident angle is large. For this reason, light that is emitted from the side surface 30b near the end face 30a immediately after entering the optical fiber 30 can be reflected by the reflection surface 168 of the cylindrical holder 162 and returned to the inside of the optical fiber 30. .

  In FIG. 7, after the light reflected by the reflection surface 168 of the cylindrical holder 162 returns to the inside of the optical fiber 30, it is illustrated so that the reflection is repeated at the reflection surface 168 at the same angle. The reflection occurs only in a plane including the optical axis Ax, and generally, the incident angle of the light returned to the inside of the optical fiber 30 to the side surface 30b is larger than this. Therefore, most of the light returned to the inside of the optical fiber 30 becomes light totally reflected on the side surface 30 b until reaching the right end edge of the fiber insertion hole 162 a of the cylindrical holder 162.

  By adopting the configuration of the present modification, light incident from the end face 30 a to the optical fiber 30 can be utilized to the maximum extent.

  The numerical values shown as specifications in the above-described embodiment and the modifications thereof are merely examples, and it goes without saying that these may be appropriately set to different values.

  Moreover, this invention is not limited to the structure described in the said embodiment and its modification example, The structure which added the various change except this is employable.

DESCRIPTION OF SYMBOLS 10 Vehicle lamp 12 Lamp body 14 Light transmission cover 16 Extension panel 16a, 80a Opening part 20 Light emission unit 30 Optical fiber 30a End surface 30b Side surface (peripheral surface)
40 light source unit 50 light emitting diode 50a light emitting part 52 light emitting chip 52a light emitting surface 54 substrate 56 package 56a, 60Ac, 60Bc, 62c outer peripheral flange 58 sealing material 60 condensing lens 60A, 60B convex lens 60Aa, 60Ab, 60Ba, 60Bb lens surface 62, 162 cylindrical holder (reflector)
62a, 162a Fiber insertion hole 62b Cylindrical part 62d, 80b, 162d, 168 Reflective surface 64 Light source support plate 66 Heat sink 70 Housing 70a Inner peripheral flange part 72, 74 Cylindrical member 80 Reflective sheet Ax Optical axis θ Half apex angle

Claims (6)

A light emitting diode, a condensing lens for condensing emitted light from the light emitting diode, and a side light emitting optical fiber configured to cause the light emitted from the condensing lens to be incident from an end face and emitted from a side surface; In a vehicle lamp provided with
A vehicle lamp characterized in that a reflector is disposed around the end face of the optical fiber to reflect light directed from the condenser lens toward the periphery of the end face toward the end face.   2. The vehicle lamp according to claim 1, wherein the condenser lens is composed of a pair of convex lenses disposed in opposite directions to each other.   3. The vehicular lamp according to claim 2, wherein each of the pair of convex lenses is a biconvex lens in which the curvatures of the lens surfaces facing each other are larger than the curvatures of the opposite lens surfaces.   The reflecting surface of the reflector is a conical surface extending from the position of the outer peripheral edge of the end face of the optical fiber at a half apex angle of 60 ° or more centering on the central axis of the optical fiber. The vehicle lamp according to any one of Items 1 to 3.   The vehicle lamp according to any one of claims 1 to 4, wherein the reflector is integrally formed with a cylindrical holder for supporting an end of the optical fiber.   The vehicle lamp according to claim 5, wherein an inner peripheral surface of the cylindrical holder is configured as a reflective surface.

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